2408 lines
100 KiB
C
2408 lines
100 KiB
C
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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/* ***************************************************************
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* Tuning parameters
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*****************************************************************/
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/*!
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* HEAPMODE :
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* Select how default decompression function ZSTD_decompress() allocates its context,
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* on stack (0), or into heap (1, default; requires malloc()).
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* Note that functions with explicit context such as ZSTD_decompressDCtx() are unaffected.
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*/
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#ifndef ZSTD_HEAPMODE
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# define ZSTD_HEAPMODE 1
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#endif
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/*!
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* LEGACY_SUPPORT :
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* if set to 1+, ZSTD_decompress() can decode older formats (v0.1+)
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*/
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#ifndef ZSTD_LEGACY_SUPPORT
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# define ZSTD_LEGACY_SUPPORT 0
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#endif
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/*!
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* MAXWINDOWSIZE_DEFAULT :
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* maximum window size accepted by DStream __by default__.
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* Frames requiring more memory will be rejected.
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* It's possible to set a different limit using ZSTD_DCtx_setMaxWindowSize().
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*/
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#ifndef ZSTD_MAXWINDOWSIZE_DEFAULT
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# define ZSTD_MAXWINDOWSIZE_DEFAULT (((U32)1 << ZSTD_WINDOWLOG_LIMIT_DEFAULT) + 1)
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#endif
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/*!
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* NO_FORWARD_PROGRESS_MAX :
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* maximum allowed nb of calls to ZSTD_decompressStream()
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* without any forward progress
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* (defined as: no byte read from input, and no byte flushed to output)
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* before triggering an error.
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*/
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#ifndef ZSTD_NO_FORWARD_PROGRESS_MAX
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# define ZSTD_NO_FORWARD_PROGRESS_MAX 16
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#endif
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/*-*******************************************************
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* Dependencies
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*********************************************************/
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#include "../common/zstd_deps.h" /* ZSTD_memcpy, ZSTD_memmove, ZSTD_memset */
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#include "../common/allocations.h" /* ZSTD_customMalloc, ZSTD_customCalloc, ZSTD_customFree */
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#include "../common/error_private.h"
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#include "../common/zstd_internal.h" /* blockProperties_t */
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#include "../common/mem.h" /* low level memory routines */
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#include "../common/bits.h" /* ZSTD_highbit32 */
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#define FSE_STATIC_LINKING_ONLY
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#include "../common/fse.h"
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#include "../common/huf.h"
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#include "../common/xxhash.h" /* XXH64_reset, XXH64_update, XXH64_digest, XXH64 */
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#include "zstd_decompress_internal.h" /* ZSTD_DCtx */
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#include "zstd_ddict.h" /* ZSTD_DDictDictContent */
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#include "zstd_decompress_block.h" /* ZSTD_decompressBlock_internal */
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#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT>=1)
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# include "../legacy/zstd_legacy.h"
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#endif
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/*************************************
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* Multiple DDicts Hashset internals *
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*************************************/
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#define DDICT_HASHSET_MAX_LOAD_FACTOR_COUNT_MULT 4
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#define DDICT_HASHSET_MAX_LOAD_FACTOR_SIZE_MULT 3 /* These two constants represent SIZE_MULT/COUNT_MULT load factor without using a float.
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* Currently, that means a 0.75 load factor.
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* So, if count * COUNT_MULT / size * SIZE_MULT != 0, then we've exceeded
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* the load factor of the ddict hash set.
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*/
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#define DDICT_HASHSET_TABLE_BASE_SIZE 64
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#define DDICT_HASHSET_RESIZE_FACTOR 2
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/* Hash function to determine starting position of dict insertion within the table
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* Returns an index between [0, hashSet->ddictPtrTableSize]
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*/
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static size_t ZSTD_DDictHashSet_getIndex(const ZSTD_DDictHashSet* hashSet, U32 dictID) {
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const U64 hash = XXH64(&dictID, sizeof(U32), 0);
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/* DDict ptr table size is a multiple of 2, use size - 1 as mask to get index within [0, hashSet->ddictPtrTableSize) */
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return hash & (hashSet->ddictPtrTableSize - 1);
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}
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/* Adds DDict to a hashset without resizing it.
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* If inserting a DDict with a dictID that already exists in the set, replaces the one in the set.
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* Returns 0 if successful, or a zstd error code if something went wrong.
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*/
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static size_t ZSTD_DDictHashSet_emplaceDDict(ZSTD_DDictHashSet* hashSet, const ZSTD_DDict* ddict) {
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const U32 dictID = ZSTD_getDictID_fromDDict(ddict);
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size_t idx = ZSTD_DDictHashSet_getIndex(hashSet, dictID);
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const size_t idxRangeMask = hashSet->ddictPtrTableSize - 1;
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RETURN_ERROR_IF(hashSet->ddictPtrCount == hashSet->ddictPtrTableSize, GENERIC, "Hash set is full!");
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DEBUGLOG(4, "Hashed index: for dictID: %u is %zu", dictID, idx);
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while (hashSet->ddictPtrTable[idx] != NULL) {
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/* Replace existing ddict if inserting ddict with same dictID */
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if (ZSTD_getDictID_fromDDict(hashSet->ddictPtrTable[idx]) == dictID) {
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DEBUGLOG(4, "DictID already exists, replacing rather than adding");
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hashSet->ddictPtrTable[idx] = ddict;
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return 0;
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}
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idx &= idxRangeMask;
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idx++;
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}
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DEBUGLOG(4, "Final idx after probing for dictID %u is: %zu", dictID, idx);
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hashSet->ddictPtrTable[idx] = ddict;
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hashSet->ddictPtrCount++;
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return 0;
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}
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/* Expands hash table by factor of DDICT_HASHSET_RESIZE_FACTOR and
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* rehashes all values, allocates new table, frees old table.
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* Returns 0 on success, otherwise a zstd error code.
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*/
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static size_t ZSTD_DDictHashSet_expand(ZSTD_DDictHashSet* hashSet, ZSTD_customMem customMem) {
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size_t newTableSize = hashSet->ddictPtrTableSize * DDICT_HASHSET_RESIZE_FACTOR;
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const ZSTD_DDict** newTable = (const ZSTD_DDict**)ZSTD_customCalloc(sizeof(ZSTD_DDict*) * newTableSize, customMem);
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const ZSTD_DDict** oldTable = hashSet->ddictPtrTable;
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size_t oldTableSize = hashSet->ddictPtrTableSize;
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size_t i;
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DEBUGLOG(4, "Expanding DDict hash table! Old size: %zu new size: %zu", oldTableSize, newTableSize);
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RETURN_ERROR_IF(!newTable, memory_allocation, "Expanded hashset allocation failed!");
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hashSet->ddictPtrTable = newTable;
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hashSet->ddictPtrTableSize = newTableSize;
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hashSet->ddictPtrCount = 0;
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for (i = 0; i < oldTableSize; ++i) {
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if (oldTable[i] != NULL) {
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FORWARD_IF_ERROR(ZSTD_DDictHashSet_emplaceDDict(hashSet, oldTable[i]), "");
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}
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}
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ZSTD_customFree((void*)oldTable, customMem);
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DEBUGLOG(4, "Finished re-hash");
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return 0;
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}
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/* Fetches a DDict with the given dictID
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* Returns the ZSTD_DDict* with the requested dictID. If it doesn't exist, then returns NULL.
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*/
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static const ZSTD_DDict* ZSTD_DDictHashSet_getDDict(ZSTD_DDictHashSet* hashSet, U32 dictID) {
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size_t idx = ZSTD_DDictHashSet_getIndex(hashSet, dictID);
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const size_t idxRangeMask = hashSet->ddictPtrTableSize - 1;
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DEBUGLOG(4, "Hashed index: for dictID: %u is %zu", dictID, idx);
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for (;;) {
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size_t currDictID = ZSTD_getDictID_fromDDict(hashSet->ddictPtrTable[idx]);
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if (currDictID == dictID || currDictID == 0) {
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/* currDictID == 0 implies a NULL ddict entry */
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break;
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} else {
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idx &= idxRangeMask; /* Goes to start of table when we reach the end */
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idx++;
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}
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}
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DEBUGLOG(4, "Final idx after probing for dictID %u is: %zu", dictID, idx);
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return hashSet->ddictPtrTable[idx];
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}
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/* Allocates space for and returns a ddict hash set
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* The hash set's ZSTD_DDict* table has all values automatically set to NULL to begin with.
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* Returns NULL if allocation failed.
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*/
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static ZSTD_DDictHashSet* ZSTD_createDDictHashSet(ZSTD_customMem customMem) {
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ZSTD_DDictHashSet* ret = (ZSTD_DDictHashSet*)ZSTD_customMalloc(sizeof(ZSTD_DDictHashSet), customMem);
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DEBUGLOG(4, "Allocating new hash set");
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if (!ret)
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return NULL;
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ret->ddictPtrTable = (const ZSTD_DDict**)ZSTD_customCalloc(DDICT_HASHSET_TABLE_BASE_SIZE * sizeof(ZSTD_DDict*), customMem);
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if (!ret->ddictPtrTable) {
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ZSTD_customFree(ret, customMem);
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return NULL;
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}
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ret->ddictPtrTableSize = DDICT_HASHSET_TABLE_BASE_SIZE;
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ret->ddictPtrCount = 0;
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return ret;
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}
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/* Frees the table of ZSTD_DDict* within a hashset, then frees the hashset itself.
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* Note: The ZSTD_DDict* within the table are NOT freed.
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*/
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static void ZSTD_freeDDictHashSet(ZSTD_DDictHashSet* hashSet, ZSTD_customMem customMem) {
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DEBUGLOG(4, "Freeing ddict hash set");
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if (hashSet && hashSet->ddictPtrTable) {
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ZSTD_customFree((void*)hashSet->ddictPtrTable, customMem);
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}
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if (hashSet) {
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ZSTD_customFree(hashSet, customMem);
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}
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}
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/* Public function: Adds a DDict into the ZSTD_DDictHashSet, possibly triggering a resize of the hash set.
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* Returns 0 on success, or a ZSTD error.
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*/
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static size_t ZSTD_DDictHashSet_addDDict(ZSTD_DDictHashSet* hashSet, const ZSTD_DDict* ddict, ZSTD_customMem customMem) {
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DEBUGLOG(4, "Adding dict ID: %u to hashset with - Count: %zu Tablesize: %zu", ZSTD_getDictID_fromDDict(ddict), hashSet->ddictPtrCount, hashSet->ddictPtrTableSize);
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if (hashSet->ddictPtrCount * DDICT_HASHSET_MAX_LOAD_FACTOR_COUNT_MULT / hashSet->ddictPtrTableSize * DDICT_HASHSET_MAX_LOAD_FACTOR_SIZE_MULT != 0) {
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FORWARD_IF_ERROR(ZSTD_DDictHashSet_expand(hashSet, customMem), "");
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}
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FORWARD_IF_ERROR(ZSTD_DDictHashSet_emplaceDDict(hashSet, ddict), "");
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return 0;
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}
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/*-*************************************************************
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* Context management
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***************************************************************/
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size_t ZSTD_sizeof_DCtx (const ZSTD_DCtx* dctx)
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{
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if (dctx==NULL) return 0; /* support sizeof NULL */
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return sizeof(*dctx)
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+ ZSTD_sizeof_DDict(dctx->ddictLocal)
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+ dctx->inBuffSize + dctx->outBuffSize;
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}
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size_t ZSTD_estimateDCtxSize(void) { return sizeof(ZSTD_DCtx); }
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static size_t ZSTD_startingInputLength(ZSTD_format_e format)
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{
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size_t const startingInputLength = ZSTD_FRAMEHEADERSIZE_PREFIX(format);
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/* only supports formats ZSTD_f_zstd1 and ZSTD_f_zstd1_magicless */
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assert( (format == ZSTD_f_zstd1) || (format == ZSTD_f_zstd1_magicless) );
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return startingInputLength;
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}
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static void ZSTD_DCtx_resetParameters(ZSTD_DCtx* dctx)
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{
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assert(dctx->streamStage == zdss_init);
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dctx->format = ZSTD_f_zstd1;
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dctx->maxWindowSize = ZSTD_MAXWINDOWSIZE_DEFAULT;
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dctx->outBufferMode = ZSTD_bm_buffered;
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dctx->forceIgnoreChecksum = ZSTD_d_validateChecksum;
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dctx->refMultipleDDicts = ZSTD_rmd_refSingleDDict;
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dctx->disableHufAsm = 0;
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dctx->maxBlockSizeParam = 0;
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}
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static void ZSTD_initDCtx_internal(ZSTD_DCtx* dctx)
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{
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dctx->staticSize = 0;
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dctx->ddict = NULL;
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dctx->ddictLocal = NULL;
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dctx->dictEnd = NULL;
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dctx->ddictIsCold = 0;
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dctx->dictUses = ZSTD_dont_use;
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dctx->inBuff = NULL;
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dctx->inBuffSize = 0;
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dctx->outBuffSize = 0;
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dctx->streamStage = zdss_init;
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#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT>=1)
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dctx->legacyContext = NULL;
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dctx->previousLegacyVersion = 0;
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#endif
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dctx->noForwardProgress = 0;
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dctx->oversizedDuration = 0;
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dctx->isFrameDecompression = 1;
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#if DYNAMIC_BMI2
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dctx->bmi2 = ZSTD_cpuSupportsBmi2();
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#endif
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dctx->ddictSet = NULL;
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ZSTD_DCtx_resetParameters(dctx);
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#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
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dctx->dictContentEndForFuzzing = NULL;
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#endif
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}
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ZSTD_DCtx* ZSTD_initStaticDCtx(void *workspace, size_t workspaceSize)
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{
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ZSTD_DCtx* const dctx = (ZSTD_DCtx*) workspace;
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if ((size_t)workspace & 7) return NULL; /* 8-aligned */
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if (workspaceSize < sizeof(ZSTD_DCtx)) return NULL; /* minimum size */
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ZSTD_initDCtx_internal(dctx);
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dctx->staticSize = workspaceSize;
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dctx->inBuff = (char*)(dctx+1);
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return dctx;
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}
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static ZSTD_DCtx* ZSTD_createDCtx_internal(ZSTD_customMem customMem) {
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if ((!customMem.customAlloc) ^ (!customMem.customFree)) return NULL;
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{ ZSTD_DCtx* const dctx = (ZSTD_DCtx*)ZSTD_customMalloc(sizeof(*dctx), customMem);
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if (!dctx) return NULL;
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dctx->customMem = customMem;
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ZSTD_initDCtx_internal(dctx);
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return dctx;
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}
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}
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ZSTD_DCtx* ZSTD_createDCtx_advanced(ZSTD_customMem customMem)
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{
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return ZSTD_createDCtx_internal(customMem);
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}
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ZSTD_DCtx* ZSTD_createDCtx(void)
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{
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DEBUGLOG(3, "ZSTD_createDCtx");
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return ZSTD_createDCtx_internal(ZSTD_defaultCMem);
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}
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static void ZSTD_clearDict(ZSTD_DCtx* dctx)
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{
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ZSTD_freeDDict(dctx->ddictLocal);
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dctx->ddictLocal = NULL;
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dctx->ddict = NULL;
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dctx->dictUses = ZSTD_dont_use;
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}
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size_t ZSTD_freeDCtx(ZSTD_DCtx* dctx)
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{
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if (dctx==NULL) return 0; /* support free on NULL */
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RETURN_ERROR_IF(dctx->staticSize, memory_allocation, "not compatible with static DCtx");
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{ ZSTD_customMem const cMem = dctx->customMem;
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ZSTD_clearDict(dctx);
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ZSTD_customFree(dctx->inBuff, cMem);
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dctx->inBuff = NULL;
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#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT >= 1)
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if (dctx->legacyContext)
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ZSTD_freeLegacyStreamContext(dctx->legacyContext, dctx->previousLegacyVersion);
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#endif
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if (dctx->ddictSet) {
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ZSTD_freeDDictHashSet(dctx->ddictSet, cMem);
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dctx->ddictSet = NULL;
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}
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ZSTD_customFree(dctx, cMem);
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return 0;
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}
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}
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/* no longer useful */
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void ZSTD_copyDCtx(ZSTD_DCtx* dstDCtx, const ZSTD_DCtx* srcDCtx)
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{
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size_t const toCopy = (size_t)((char*)(&dstDCtx->inBuff) - (char*)dstDCtx);
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ZSTD_memcpy(dstDCtx, srcDCtx, toCopy); /* no need to copy workspace */
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}
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/* Given a dctx with a digested frame params, re-selects the correct ZSTD_DDict based on
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* the requested dict ID from the frame. If there exists a reference to the correct ZSTD_DDict, then
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* accordingly sets the ddict to be used to decompress the frame.
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*
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* If no DDict is found, then no action is taken, and the ZSTD_DCtx::ddict remains as-is.
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*
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* ZSTD_d_refMultipleDDicts must be enabled for this function to be called.
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*/
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static void ZSTD_DCtx_selectFrameDDict(ZSTD_DCtx* dctx) {
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assert(dctx->refMultipleDDicts && dctx->ddictSet);
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DEBUGLOG(4, "Adjusting DDict based on requested dict ID from frame");
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if (dctx->ddict) {
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const ZSTD_DDict* frameDDict = ZSTD_DDictHashSet_getDDict(dctx->ddictSet, dctx->fParams.dictID);
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if (frameDDict) {
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DEBUGLOG(4, "DDict found!");
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ZSTD_clearDict(dctx);
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dctx->dictID = dctx->fParams.dictID;
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dctx->ddict = frameDDict;
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dctx->dictUses = ZSTD_use_indefinitely;
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}
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}
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}
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/*-*************************************************************
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* Frame header decoding
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***************************************************************/
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/*! ZSTD_isFrame() :
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* Tells if the content of `buffer` starts with a valid Frame Identifier.
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* Note : Frame Identifier is 4 bytes. If `size < 4`, @return will always be 0.
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* Note 2 : Legacy Frame Identifiers are considered valid only if Legacy Support is enabled.
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* Note 3 : Skippable Frame Identifiers are considered valid. */
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unsigned ZSTD_isFrame(const void* buffer, size_t size)
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{
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if (size < ZSTD_FRAMEIDSIZE) return 0;
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{ U32 const magic = MEM_readLE32(buffer);
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if (magic == ZSTD_MAGICNUMBER) return 1;
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if ((magic & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) return 1;
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}
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#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT >= 1)
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if (ZSTD_isLegacy(buffer, size)) return 1;
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#endif
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return 0;
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}
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/*! ZSTD_isSkippableFrame() :
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* Tells if the content of `buffer` starts with a valid Frame Identifier for a skippable frame.
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* Note : Frame Identifier is 4 bytes. If `size < 4`, @return will always be 0.
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*/
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unsigned ZSTD_isSkippableFrame(const void* buffer, size_t size)
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{
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if (size < ZSTD_FRAMEIDSIZE) return 0;
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{ U32 const magic = MEM_readLE32(buffer);
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if ((magic & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) return 1;
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}
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return 0;
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}
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/** ZSTD_frameHeaderSize_internal() :
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* srcSize must be large enough to reach header size fields.
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* note : only works for formats ZSTD_f_zstd1 and ZSTD_f_zstd1_magicless.
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* @return : size of the Frame Header
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* or an error code, which can be tested with ZSTD_isError() */
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static size_t ZSTD_frameHeaderSize_internal(const void* src, size_t srcSize, ZSTD_format_e format)
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{
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size_t const minInputSize = ZSTD_startingInputLength(format);
|
|
RETURN_ERROR_IF(srcSize < minInputSize, srcSize_wrong, "");
|
|
|
|
{ BYTE const fhd = ((const BYTE*)src)[minInputSize-1];
|
|
U32 const dictID= fhd & 3;
|
|
U32 const singleSegment = (fhd >> 5) & 1;
|
|
U32 const fcsId = fhd >> 6;
|
|
return minInputSize + !singleSegment
|
|
+ ZSTD_did_fieldSize[dictID] + ZSTD_fcs_fieldSize[fcsId]
|
|
+ (singleSegment && !fcsId);
|
|
}
|
|
}
|
|
|
|
/** ZSTD_frameHeaderSize() :
|
|
* srcSize must be >= ZSTD_frameHeaderSize_prefix.
|
|
* @return : size of the Frame Header,
|
|
* or an error code (if srcSize is too small) */
|
|
size_t ZSTD_frameHeaderSize(const void* src, size_t srcSize)
|
|
{
|
|
return ZSTD_frameHeaderSize_internal(src, srcSize, ZSTD_f_zstd1);
|
|
}
|
|
|
|
|
|
/** ZSTD_getFrameHeader_advanced() :
|
|
* decode Frame Header, or require larger `srcSize`.
|
|
* note : only works for formats ZSTD_f_zstd1 and ZSTD_f_zstd1_magicless
|
|
* @return : 0, `zfhPtr` is correctly filled,
|
|
* >0, `srcSize` is too small, value is wanted `srcSize` amount,
|
|
** or an error code, which can be tested using ZSTD_isError() */
|
|
size_t ZSTD_getFrameHeader_advanced(ZSTD_frameHeader* zfhPtr, const void* src, size_t srcSize, ZSTD_format_e format)
|
|
{
|
|
const BYTE* ip = (const BYTE*)src;
|
|
size_t const minInputSize = ZSTD_startingInputLength(format);
|
|
|
|
DEBUGLOG(5, "ZSTD_getFrameHeader_advanced: minInputSize = %zu, srcSize = %zu", minInputSize, srcSize);
|
|
|
|
if (srcSize > 0) {
|
|
/* note : technically could be considered an assert(), since it's an invalid entry */
|
|
RETURN_ERROR_IF(src==NULL, GENERIC, "invalid parameter : src==NULL, but srcSize>0");
|
|
}
|
|
if (srcSize < minInputSize) {
|
|
if (srcSize > 0 && format != ZSTD_f_zstd1_magicless) {
|
|
/* when receiving less than @minInputSize bytes,
|
|
* control these bytes at least correspond to a supported magic number
|
|
* in order to error out early if they don't.
|
|
**/
|
|
size_t const toCopy = MIN(4, srcSize);
|
|
unsigned char hbuf[4]; MEM_writeLE32(hbuf, ZSTD_MAGICNUMBER);
|
|
assert(src != NULL);
|
|
ZSTD_memcpy(hbuf, src, toCopy);
|
|
if ( MEM_readLE32(hbuf) != ZSTD_MAGICNUMBER ) {
|
|
/* not a zstd frame : let's check if it's a skippable frame */
|
|
MEM_writeLE32(hbuf, ZSTD_MAGIC_SKIPPABLE_START);
|
|
ZSTD_memcpy(hbuf, src, toCopy);
|
|
if ((MEM_readLE32(hbuf) & ZSTD_MAGIC_SKIPPABLE_MASK) != ZSTD_MAGIC_SKIPPABLE_START) {
|
|
RETURN_ERROR(prefix_unknown,
|
|
"first bytes don't correspond to any supported magic number");
|
|
} } }
|
|
return minInputSize;
|
|
}
|
|
|
|
ZSTD_memset(zfhPtr, 0, sizeof(*zfhPtr)); /* not strictly necessary, but static analyzers may not understand that zfhPtr will be read only if return value is zero, since they are 2 different signals */
|
|
if ( (format != ZSTD_f_zstd1_magicless)
|
|
&& (MEM_readLE32(src) != ZSTD_MAGICNUMBER) ) {
|
|
if ((MEM_readLE32(src) & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) {
|
|
/* skippable frame */
|
|
if (srcSize < ZSTD_SKIPPABLEHEADERSIZE)
|
|
return ZSTD_SKIPPABLEHEADERSIZE; /* magic number + frame length */
|
|
ZSTD_memset(zfhPtr, 0, sizeof(*zfhPtr));
|
|
zfhPtr->frameContentSize = MEM_readLE32((const char *)src + ZSTD_FRAMEIDSIZE);
|
|
zfhPtr->frameType = ZSTD_skippableFrame;
|
|
return 0;
|
|
}
|
|
RETURN_ERROR(prefix_unknown, "");
|
|
}
|
|
|
|
/* ensure there is enough `srcSize` to fully read/decode frame header */
|
|
{ size_t const fhsize = ZSTD_frameHeaderSize_internal(src, srcSize, format);
|
|
if (srcSize < fhsize) return fhsize;
|
|
zfhPtr->headerSize = (U32)fhsize;
|
|
}
|
|
|
|
{ BYTE const fhdByte = ip[minInputSize-1];
|
|
size_t pos = minInputSize;
|
|
U32 const dictIDSizeCode = fhdByte&3;
|
|
U32 const checksumFlag = (fhdByte>>2)&1;
|
|
U32 const singleSegment = (fhdByte>>5)&1;
|
|
U32 const fcsID = fhdByte>>6;
|
|
U64 windowSize = 0;
|
|
U32 dictID = 0;
|
|
U64 frameContentSize = ZSTD_CONTENTSIZE_UNKNOWN;
|
|
RETURN_ERROR_IF((fhdByte & 0x08) != 0, frameParameter_unsupported,
|
|
"reserved bits, must be zero");
|
|
|
|
if (!singleSegment) {
|
|
BYTE const wlByte = ip[pos++];
|
|
U32 const windowLog = (wlByte >> 3) + ZSTD_WINDOWLOG_ABSOLUTEMIN;
|
|
RETURN_ERROR_IF(windowLog > ZSTD_WINDOWLOG_MAX, frameParameter_windowTooLarge, "");
|
|
windowSize = (1ULL << windowLog);
|
|
windowSize += (windowSize >> 3) * (wlByte&7);
|
|
}
|
|
switch(dictIDSizeCode)
|
|
{
|
|
default:
|
|
assert(0); /* impossible */
|
|
ZSTD_FALLTHROUGH;
|
|
case 0 : break;
|
|
case 1 : dictID = ip[pos]; pos++; break;
|
|
case 2 : dictID = MEM_readLE16(ip+pos); pos+=2; break;
|
|
case 3 : dictID = MEM_readLE32(ip+pos); pos+=4; break;
|
|
}
|
|
switch(fcsID)
|
|
{
|
|
default:
|
|
assert(0); /* impossible */
|
|
ZSTD_FALLTHROUGH;
|
|
case 0 : if (singleSegment) frameContentSize = ip[pos]; break;
|
|
case 1 : frameContentSize = MEM_readLE16(ip+pos)+256; break;
|
|
case 2 : frameContentSize = MEM_readLE32(ip+pos); break;
|
|
case 3 : frameContentSize = MEM_readLE64(ip+pos); break;
|
|
}
|
|
if (singleSegment) windowSize = frameContentSize;
|
|
|
|
zfhPtr->frameType = ZSTD_frame;
|
|
zfhPtr->frameContentSize = frameContentSize;
|
|
zfhPtr->windowSize = windowSize;
|
|
zfhPtr->blockSizeMax = (unsigned) MIN(windowSize, ZSTD_BLOCKSIZE_MAX);
|
|
zfhPtr->dictID = dictID;
|
|
zfhPtr->checksumFlag = checksumFlag;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/** ZSTD_getFrameHeader() :
|
|
* decode Frame Header, or require larger `srcSize`.
|
|
* note : this function does not consume input, it only reads it.
|
|
* @return : 0, `zfhPtr` is correctly filled,
|
|
* >0, `srcSize` is too small, value is wanted `srcSize` amount,
|
|
* or an error code, which can be tested using ZSTD_isError() */
|
|
size_t ZSTD_getFrameHeader(ZSTD_frameHeader* zfhPtr, const void* src, size_t srcSize)
|
|
{
|
|
return ZSTD_getFrameHeader_advanced(zfhPtr, src, srcSize, ZSTD_f_zstd1);
|
|
}
|
|
|
|
/** ZSTD_getFrameContentSize() :
|
|
* compatible with legacy mode
|
|
* @return : decompressed size of the single frame pointed to be `src` if known, otherwise
|
|
* - ZSTD_CONTENTSIZE_UNKNOWN if the size cannot be determined
|
|
* - ZSTD_CONTENTSIZE_ERROR if an error occurred (e.g. invalid magic number, srcSize too small) */
|
|
unsigned long long ZSTD_getFrameContentSize(const void *src, size_t srcSize)
|
|
{
|
|
#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT >= 1)
|
|
if (ZSTD_isLegacy(src, srcSize)) {
|
|
unsigned long long const ret = ZSTD_getDecompressedSize_legacy(src, srcSize);
|
|
return ret == 0 ? ZSTD_CONTENTSIZE_UNKNOWN : ret;
|
|
}
|
|
#endif
|
|
{ ZSTD_frameHeader zfh;
|
|
if (ZSTD_getFrameHeader(&zfh, src, srcSize) != 0)
|
|
return ZSTD_CONTENTSIZE_ERROR;
|
|
if (zfh.frameType == ZSTD_skippableFrame) {
|
|
return 0;
|
|
} else {
|
|
return zfh.frameContentSize;
|
|
} }
|
|
}
|
|
|
|
static size_t readSkippableFrameSize(void const* src, size_t srcSize)
|
|
{
|
|
size_t const skippableHeaderSize = ZSTD_SKIPPABLEHEADERSIZE;
|
|
U32 sizeU32;
|
|
|
|
RETURN_ERROR_IF(srcSize < ZSTD_SKIPPABLEHEADERSIZE, srcSize_wrong, "");
|
|
|
|
sizeU32 = MEM_readLE32((BYTE const*)src + ZSTD_FRAMEIDSIZE);
|
|
RETURN_ERROR_IF((U32)(sizeU32 + ZSTD_SKIPPABLEHEADERSIZE) < sizeU32,
|
|
frameParameter_unsupported, "");
|
|
{ size_t const skippableSize = skippableHeaderSize + sizeU32;
|
|
RETURN_ERROR_IF(skippableSize > srcSize, srcSize_wrong, "");
|
|
return skippableSize;
|
|
}
|
|
}
|
|
|
|
/*! ZSTD_readSkippableFrame() :
|
|
* Retrieves content of a skippable frame, and writes it to dst buffer.
|
|
*
|
|
* The parameter magicVariant will receive the magicVariant that was supplied when the frame was written,
|
|
* i.e. magicNumber - ZSTD_MAGIC_SKIPPABLE_START. This can be NULL if the caller is not interested
|
|
* in the magicVariant.
|
|
*
|
|
* Returns an error if destination buffer is not large enough, or if this is not a valid skippable frame.
|
|
*
|
|
* @return : number of bytes written or a ZSTD error.
|
|
*/
|
|
size_t ZSTD_readSkippableFrame(void* dst, size_t dstCapacity,
|
|
unsigned* magicVariant, /* optional, can be NULL */
|
|
const void* src, size_t srcSize)
|
|
{
|
|
RETURN_ERROR_IF(srcSize < ZSTD_SKIPPABLEHEADERSIZE, srcSize_wrong, "");
|
|
|
|
{ U32 const magicNumber = MEM_readLE32(src);
|
|
size_t skippableFrameSize = readSkippableFrameSize(src, srcSize);
|
|
size_t skippableContentSize = skippableFrameSize - ZSTD_SKIPPABLEHEADERSIZE;
|
|
|
|
/* check input validity */
|
|
RETURN_ERROR_IF(!ZSTD_isSkippableFrame(src, srcSize), frameParameter_unsupported, "");
|
|
RETURN_ERROR_IF(skippableFrameSize < ZSTD_SKIPPABLEHEADERSIZE || skippableFrameSize > srcSize, srcSize_wrong, "");
|
|
RETURN_ERROR_IF(skippableContentSize > dstCapacity, dstSize_tooSmall, "");
|
|
|
|
/* deliver payload */
|
|
if (skippableContentSize > 0 && dst != NULL)
|
|
ZSTD_memcpy(dst, (const BYTE *)src + ZSTD_SKIPPABLEHEADERSIZE, skippableContentSize);
|
|
if (magicVariant != NULL)
|
|
*magicVariant = magicNumber - ZSTD_MAGIC_SKIPPABLE_START;
|
|
return skippableContentSize;
|
|
}
|
|
}
|
|
|
|
/** ZSTD_findDecompressedSize() :
|
|
* `srcSize` must be the exact length of some number of ZSTD compressed and/or
|
|
* skippable frames
|
|
* note: compatible with legacy mode
|
|
* @return : decompressed size of the frames contained */
|
|
unsigned long long ZSTD_findDecompressedSize(const void* src, size_t srcSize)
|
|
{
|
|
unsigned long long totalDstSize = 0;
|
|
|
|
while (srcSize >= ZSTD_startingInputLength(ZSTD_f_zstd1)) {
|
|
U32 const magicNumber = MEM_readLE32(src);
|
|
|
|
if ((magicNumber & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) {
|
|
size_t const skippableSize = readSkippableFrameSize(src, srcSize);
|
|
if (ZSTD_isError(skippableSize)) return ZSTD_CONTENTSIZE_ERROR;
|
|
assert(skippableSize <= srcSize);
|
|
|
|
src = (const BYTE *)src + skippableSize;
|
|
srcSize -= skippableSize;
|
|
continue;
|
|
}
|
|
|
|
{ unsigned long long const fcs = ZSTD_getFrameContentSize(src, srcSize);
|
|
if (fcs >= ZSTD_CONTENTSIZE_ERROR) return fcs;
|
|
|
|
if (totalDstSize + fcs < totalDstSize)
|
|
return ZSTD_CONTENTSIZE_ERROR; /* check for overflow */
|
|
totalDstSize += fcs;
|
|
}
|
|
/* skip to next frame */
|
|
{ size_t const frameSrcSize = ZSTD_findFrameCompressedSize(src, srcSize);
|
|
if (ZSTD_isError(frameSrcSize)) return ZSTD_CONTENTSIZE_ERROR;
|
|
assert(frameSrcSize <= srcSize);
|
|
|
|
src = (const BYTE *)src + frameSrcSize;
|
|
srcSize -= frameSrcSize;
|
|
}
|
|
} /* while (srcSize >= ZSTD_frameHeaderSize_prefix) */
|
|
|
|
if (srcSize) return ZSTD_CONTENTSIZE_ERROR;
|
|
|
|
return totalDstSize;
|
|
}
|
|
|
|
/** ZSTD_getDecompressedSize() :
|
|
* compatible with legacy mode
|
|
* @return : decompressed size if known, 0 otherwise
|
|
note : 0 can mean any of the following :
|
|
- frame content is empty
|
|
- decompressed size field is not present in frame header
|
|
- frame header unknown / not supported
|
|
- frame header not complete (`srcSize` too small) */
|
|
unsigned long long ZSTD_getDecompressedSize(const void* src, size_t srcSize)
|
|
{
|
|
unsigned long long const ret = ZSTD_getFrameContentSize(src, srcSize);
|
|
ZSTD_STATIC_ASSERT(ZSTD_CONTENTSIZE_ERROR < ZSTD_CONTENTSIZE_UNKNOWN);
|
|
return (ret >= ZSTD_CONTENTSIZE_ERROR) ? 0 : ret;
|
|
}
|
|
|
|
|
|
/** ZSTD_decodeFrameHeader() :
|
|
* `headerSize` must be the size provided by ZSTD_frameHeaderSize().
|
|
* If multiple DDict references are enabled, also will choose the correct DDict to use.
|
|
* @return : 0 if success, or an error code, which can be tested using ZSTD_isError() */
|
|
static size_t ZSTD_decodeFrameHeader(ZSTD_DCtx* dctx, const void* src, size_t headerSize)
|
|
{
|
|
size_t const result = ZSTD_getFrameHeader_advanced(&(dctx->fParams), src, headerSize, dctx->format);
|
|
if (ZSTD_isError(result)) return result; /* invalid header */
|
|
RETURN_ERROR_IF(result>0, srcSize_wrong, "headerSize too small");
|
|
|
|
/* Reference DDict requested by frame if dctx references multiple ddicts */
|
|
if (dctx->refMultipleDDicts == ZSTD_rmd_refMultipleDDicts && dctx->ddictSet) {
|
|
ZSTD_DCtx_selectFrameDDict(dctx);
|
|
}
|
|
|
|
#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
|
|
/* Skip the dictID check in fuzzing mode, because it makes the search
|
|
* harder.
|
|
*/
|
|
RETURN_ERROR_IF(dctx->fParams.dictID && (dctx->dictID != dctx->fParams.dictID),
|
|
dictionary_wrong, "");
|
|
#endif
|
|
dctx->validateChecksum = (dctx->fParams.checksumFlag && !dctx->forceIgnoreChecksum) ? 1 : 0;
|
|
if (dctx->validateChecksum) XXH64_reset(&dctx->xxhState, 0);
|
|
dctx->processedCSize += headerSize;
|
|
return 0;
|
|
}
|
|
|
|
static ZSTD_frameSizeInfo ZSTD_errorFrameSizeInfo(size_t ret)
|
|
{
|
|
ZSTD_frameSizeInfo frameSizeInfo;
|
|
frameSizeInfo.compressedSize = ret;
|
|
frameSizeInfo.decompressedBound = ZSTD_CONTENTSIZE_ERROR;
|
|
return frameSizeInfo;
|
|
}
|
|
|
|
static ZSTD_frameSizeInfo ZSTD_findFrameSizeInfo(const void* src, size_t srcSize, ZSTD_format_e format)
|
|
{
|
|
ZSTD_frameSizeInfo frameSizeInfo;
|
|
ZSTD_memset(&frameSizeInfo, 0, sizeof(ZSTD_frameSizeInfo));
|
|
|
|
#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT >= 1)
|
|
if (format == ZSTD_f_zstd1 && ZSTD_isLegacy(src, srcSize))
|
|
return ZSTD_findFrameSizeInfoLegacy(src, srcSize);
|
|
#endif
|
|
|
|
if (format == ZSTD_f_zstd1 && (srcSize >= ZSTD_SKIPPABLEHEADERSIZE)
|
|
&& (MEM_readLE32(src) & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) {
|
|
frameSizeInfo.compressedSize = readSkippableFrameSize(src, srcSize);
|
|
assert(ZSTD_isError(frameSizeInfo.compressedSize) ||
|
|
frameSizeInfo.compressedSize <= srcSize);
|
|
return frameSizeInfo;
|
|
} else {
|
|
const BYTE* ip = (const BYTE*)src;
|
|
const BYTE* const ipstart = ip;
|
|
size_t remainingSize = srcSize;
|
|
size_t nbBlocks = 0;
|
|
ZSTD_frameHeader zfh;
|
|
|
|
/* Extract Frame Header */
|
|
{ size_t const ret = ZSTD_getFrameHeader_advanced(&zfh, src, srcSize, format);
|
|
if (ZSTD_isError(ret))
|
|
return ZSTD_errorFrameSizeInfo(ret);
|
|
if (ret > 0)
|
|
return ZSTD_errorFrameSizeInfo(ERROR(srcSize_wrong));
|
|
}
|
|
|
|
ip += zfh.headerSize;
|
|
remainingSize -= zfh.headerSize;
|
|
|
|
/* Iterate over each block */
|
|
while (1) {
|
|
blockProperties_t blockProperties;
|
|
size_t const cBlockSize = ZSTD_getcBlockSize(ip, remainingSize, &blockProperties);
|
|
if (ZSTD_isError(cBlockSize))
|
|
return ZSTD_errorFrameSizeInfo(cBlockSize);
|
|
|
|
if (ZSTD_blockHeaderSize + cBlockSize > remainingSize)
|
|
return ZSTD_errorFrameSizeInfo(ERROR(srcSize_wrong));
|
|
|
|
ip += ZSTD_blockHeaderSize + cBlockSize;
|
|
remainingSize -= ZSTD_blockHeaderSize + cBlockSize;
|
|
nbBlocks++;
|
|
|
|
if (blockProperties.lastBlock) break;
|
|
}
|
|
|
|
/* Final frame content checksum */
|
|
if (zfh.checksumFlag) {
|
|
if (remainingSize < 4)
|
|
return ZSTD_errorFrameSizeInfo(ERROR(srcSize_wrong));
|
|
ip += 4;
|
|
}
|
|
|
|
frameSizeInfo.nbBlocks = nbBlocks;
|
|
frameSizeInfo.compressedSize = (size_t)(ip - ipstart);
|
|
frameSizeInfo.decompressedBound = (zfh.frameContentSize != ZSTD_CONTENTSIZE_UNKNOWN)
|
|
? zfh.frameContentSize
|
|
: (unsigned long long)nbBlocks * zfh.blockSizeMax;
|
|
return frameSizeInfo;
|
|
}
|
|
}
|
|
|
|
static size_t ZSTD_findFrameCompressedSize_advanced(const void *src, size_t srcSize, ZSTD_format_e format) {
|
|
ZSTD_frameSizeInfo const frameSizeInfo = ZSTD_findFrameSizeInfo(src, srcSize, format);
|
|
return frameSizeInfo.compressedSize;
|
|
}
|
|
|
|
/** ZSTD_findFrameCompressedSize() :
|
|
* See docs in zstd.h
|
|
* Note: compatible with legacy mode */
|
|
size_t ZSTD_findFrameCompressedSize(const void *src, size_t srcSize)
|
|
{
|
|
return ZSTD_findFrameCompressedSize_advanced(src, srcSize, ZSTD_f_zstd1);
|
|
}
|
|
|
|
/** ZSTD_decompressBound() :
|
|
* compatible with legacy mode
|
|
* `src` must point to the start of a ZSTD frame or a skippeable frame
|
|
* `srcSize` must be at least as large as the frame contained
|
|
* @return : the maximum decompressed size of the compressed source
|
|
*/
|
|
unsigned long long ZSTD_decompressBound(const void* src, size_t srcSize)
|
|
{
|
|
unsigned long long bound = 0;
|
|
/* Iterate over each frame */
|
|
while (srcSize > 0) {
|
|
ZSTD_frameSizeInfo const frameSizeInfo = ZSTD_findFrameSizeInfo(src, srcSize, ZSTD_f_zstd1);
|
|
size_t const compressedSize = frameSizeInfo.compressedSize;
|
|
unsigned long long const decompressedBound = frameSizeInfo.decompressedBound;
|
|
if (ZSTD_isError(compressedSize) || decompressedBound == ZSTD_CONTENTSIZE_ERROR)
|
|
return ZSTD_CONTENTSIZE_ERROR;
|
|
assert(srcSize >= compressedSize);
|
|
src = (const BYTE*)src + compressedSize;
|
|
srcSize -= compressedSize;
|
|
bound += decompressedBound;
|
|
}
|
|
return bound;
|
|
}
|
|
|
|
size_t ZSTD_decompressionMargin(void const* src, size_t srcSize)
|
|
{
|
|
size_t margin = 0;
|
|
unsigned maxBlockSize = 0;
|
|
|
|
/* Iterate over each frame */
|
|
while (srcSize > 0) {
|
|
ZSTD_frameSizeInfo const frameSizeInfo = ZSTD_findFrameSizeInfo(src, srcSize, ZSTD_f_zstd1);
|
|
size_t const compressedSize = frameSizeInfo.compressedSize;
|
|
unsigned long long const decompressedBound = frameSizeInfo.decompressedBound;
|
|
ZSTD_frameHeader zfh;
|
|
|
|
FORWARD_IF_ERROR(ZSTD_getFrameHeader(&zfh, src, srcSize), "");
|
|
if (ZSTD_isError(compressedSize) || decompressedBound == ZSTD_CONTENTSIZE_ERROR)
|
|
return ERROR(corruption_detected);
|
|
|
|
if (zfh.frameType == ZSTD_frame) {
|
|
/* Add the frame header to our margin */
|
|
margin += zfh.headerSize;
|
|
/* Add the checksum to our margin */
|
|
margin += zfh.checksumFlag ? 4 : 0;
|
|
/* Add 3 bytes per block */
|
|
margin += 3 * frameSizeInfo.nbBlocks;
|
|
|
|
/* Compute the max block size */
|
|
maxBlockSize = MAX(maxBlockSize, zfh.blockSizeMax);
|
|
} else {
|
|
assert(zfh.frameType == ZSTD_skippableFrame);
|
|
/* Add the entire skippable frame size to our margin. */
|
|
margin += compressedSize;
|
|
}
|
|
|
|
assert(srcSize >= compressedSize);
|
|
src = (const BYTE*)src + compressedSize;
|
|
srcSize -= compressedSize;
|
|
}
|
|
|
|
/* Add the max block size back to the margin. */
|
|
margin += maxBlockSize;
|
|
|
|
return margin;
|
|
}
|
|
|
|
/*-*************************************************************
|
|
* Frame decoding
|
|
***************************************************************/
|
|
|
|
/** ZSTD_insertBlock() :
|
|
* insert `src` block into `dctx` history. Useful to track uncompressed blocks. */
|
|
size_t ZSTD_insertBlock(ZSTD_DCtx* dctx, const void* blockStart, size_t blockSize)
|
|
{
|
|
DEBUGLOG(5, "ZSTD_insertBlock: %u bytes", (unsigned)blockSize);
|
|
ZSTD_checkContinuity(dctx, blockStart, blockSize);
|
|
dctx->previousDstEnd = (const char*)blockStart + blockSize;
|
|
return blockSize;
|
|
}
|
|
|
|
|
|
static size_t ZSTD_copyRawBlock(void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize)
|
|
{
|
|
DEBUGLOG(5, "ZSTD_copyRawBlock");
|
|
RETURN_ERROR_IF(srcSize > dstCapacity, dstSize_tooSmall, "");
|
|
if (dst == NULL) {
|
|
if (srcSize == 0) return 0;
|
|
RETURN_ERROR(dstBuffer_null, "");
|
|
}
|
|
ZSTD_memmove(dst, src, srcSize);
|
|
return srcSize;
|
|
}
|
|
|
|
static size_t ZSTD_setRleBlock(void* dst, size_t dstCapacity,
|
|
BYTE b,
|
|
size_t regenSize)
|
|
{
|
|
RETURN_ERROR_IF(regenSize > dstCapacity, dstSize_tooSmall, "");
|
|
if (dst == NULL) {
|
|
if (regenSize == 0) return 0;
|
|
RETURN_ERROR(dstBuffer_null, "");
|
|
}
|
|
ZSTD_memset(dst, b, regenSize);
|
|
return regenSize;
|
|
}
|
|
|
|
static void ZSTD_DCtx_trace_end(ZSTD_DCtx const* dctx, U64 uncompressedSize, U64 compressedSize, unsigned streaming)
|
|
{
|
|
#if ZSTD_TRACE
|
|
if (dctx->traceCtx && ZSTD_trace_decompress_end != NULL) {
|
|
ZSTD_Trace trace;
|
|
ZSTD_memset(&trace, 0, sizeof(trace));
|
|
trace.version = ZSTD_VERSION_NUMBER;
|
|
trace.streaming = streaming;
|
|
if (dctx->ddict) {
|
|
trace.dictionaryID = ZSTD_getDictID_fromDDict(dctx->ddict);
|
|
trace.dictionarySize = ZSTD_DDict_dictSize(dctx->ddict);
|
|
trace.dictionaryIsCold = dctx->ddictIsCold;
|
|
}
|
|
trace.uncompressedSize = (size_t)uncompressedSize;
|
|
trace.compressedSize = (size_t)compressedSize;
|
|
trace.dctx = dctx;
|
|
ZSTD_trace_decompress_end(dctx->traceCtx, &trace);
|
|
}
|
|
#else
|
|
(void)dctx;
|
|
(void)uncompressedSize;
|
|
(void)compressedSize;
|
|
(void)streaming;
|
|
#endif
|
|
}
|
|
|
|
|
|
/*! ZSTD_decompressFrame() :
|
|
* @dctx must be properly initialized
|
|
* will update *srcPtr and *srcSizePtr,
|
|
* to make *srcPtr progress by one frame. */
|
|
static size_t ZSTD_decompressFrame(ZSTD_DCtx* dctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void** srcPtr, size_t *srcSizePtr)
|
|
{
|
|
const BYTE* const istart = (const BYTE*)(*srcPtr);
|
|
const BYTE* ip = istart;
|
|
BYTE* const ostart = (BYTE*)dst;
|
|
BYTE* const oend = dstCapacity != 0 ? ostart + dstCapacity : ostart;
|
|
BYTE* op = ostart;
|
|
size_t remainingSrcSize = *srcSizePtr;
|
|
|
|
DEBUGLOG(4, "ZSTD_decompressFrame (srcSize:%i)", (int)*srcSizePtr);
|
|
|
|
/* check */
|
|
RETURN_ERROR_IF(
|
|
remainingSrcSize < ZSTD_FRAMEHEADERSIZE_MIN(dctx->format)+ZSTD_blockHeaderSize,
|
|
srcSize_wrong, "");
|
|
|
|
/* Frame Header */
|
|
{ size_t const frameHeaderSize = ZSTD_frameHeaderSize_internal(
|
|
ip, ZSTD_FRAMEHEADERSIZE_PREFIX(dctx->format), dctx->format);
|
|
if (ZSTD_isError(frameHeaderSize)) return frameHeaderSize;
|
|
RETURN_ERROR_IF(remainingSrcSize < frameHeaderSize+ZSTD_blockHeaderSize,
|
|
srcSize_wrong, "");
|
|
FORWARD_IF_ERROR( ZSTD_decodeFrameHeader(dctx, ip, frameHeaderSize) , "");
|
|
ip += frameHeaderSize; remainingSrcSize -= frameHeaderSize;
|
|
}
|
|
|
|
/* Shrink the blockSizeMax if enabled */
|
|
if (dctx->maxBlockSizeParam != 0)
|
|
dctx->fParams.blockSizeMax = MIN(dctx->fParams.blockSizeMax, (unsigned)dctx->maxBlockSizeParam);
|
|
|
|
/* Loop on each block */
|
|
while (1) {
|
|
BYTE* oBlockEnd = oend;
|
|
size_t decodedSize;
|
|
blockProperties_t blockProperties;
|
|
size_t const cBlockSize = ZSTD_getcBlockSize(ip, remainingSrcSize, &blockProperties);
|
|
if (ZSTD_isError(cBlockSize)) return cBlockSize;
|
|
|
|
ip += ZSTD_blockHeaderSize;
|
|
remainingSrcSize -= ZSTD_blockHeaderSize;
|
|
RETURN_ERROR_IF(cBlockSize > remainingSrcSize, srcSize_wrong, "");
|
|
|
|
if (ip >= op && ip < oBlockEnd) {
|
|
/* We are decompressing in-place. Limit the output pointer so that we
|
|
* don't overwrite the block that we are currently reading. This will
|
|
* fail decompression if the input & output pointers aren't spaced
|
|
* far enough apart.
|
|
*
|
|
* This is important to set, even when the pointers are far enough
|
|
* apart, because ZSTD_decompressBlock_internal() can decide to store
|
|
* literals in the output buffer, after the block it is decompressing.
|
|
* Since we don't want anything to overwrite our input, we have to tell
|
|
* ZSTD_decompressBlock_internal to never write past ip.
|
|
*
|
|
* See ZSTD_allocateLiteralsBuffer() for reference.
|
|
*/
|
|
oBlockEnd = op + (ip - op);
|
|
}
|
|
|
|
switch(blockProperties.blockType)
|
|
{
|
|
case bt_compressed:
|
|
assert(dctx->isFrameDecompression == 1);
|
|
decodedSize = ZSTD_decompressBlock_internal(dctx, op, (size_t)(oBlockEnd-op), ip, cBlockSize, not_streaming);
|
|
break;
|
|
case bt_raw :
|
|
/* Use oend instead of oBlockEnd because this function is safe to overlap. It uses memmove. */
|
|
decodedSize = ZSTD_copyRawBlock(op, (size_t)(oend-op), ip, cBlockSize);
|
|
break;
|
|
case bt_rle :
|
|
decodedSize = ZSTD_setRleBlock(op, (size_t)(oBlockEnd-op), *ip, blockProperties.origSize);
|
|
break;
|
|
case bt_reserved :
|
|
default:
|
|
RETURN_ERROR(corruption_detected, "invalid block type");
|
|
}
|
|
FORWARD_IF_ERROR(decodedSize, "Block decompression failure");
|
|
DEBUGLOG(5, "Decompressed block of dSize = %u", (unsigned)decodedSize);
|
|
if (dctx->validateChecksum) {
|
|
XXH64_update(&dctx->xxhState, op, decodedSize);
|
|
}
|
|
if (decodedSize) /* support dst = NULL,0 */ {
|
|
op += decodedSize;
|
|
}
|
|
assert(ip != NULL);
|
|
ip += cBlockSize;
|
|
remainingSrcSize -= cBlockSize;
|
|
if (blockProperties.lastBlock) break;
|
|
}
|
|
|
|
if (dctx->fParams.frameContentSize != ZSTD_CONTENTSIZE_UNKNOWN) {
|
|
RETURN_ERROR_IF((U64)(op-ostart) != dctx->fParams.frameContentSize,
|
|
corruption_detected, "");
|
|
}
|
|
if (dctx->fParams.checksumFlag) { /* Frame content checksum verification */
|
|
RETURN_ERROR_IF(remainingSrcSize<4, checksum_wrong, "");
|
|
if (!dctx->forceIgnoreChecksum) {
|
|
U32 const checkCalc = (U32)XXH64_digest(&dctx->xxhState);
|
|
U32 checkRead;
|
|
checkRead = MEM_readLE32(ip);
|
|
RETURN_ERROR_IF(checkRead != checkCalc, checksum_wrong, "");
|
|
}
|
|
ip += 4;
|
|
remainingSrcSize -= 4;
|
|
}
|
|
ZSTD_DCtx_trace_end(dctx, (U64)(op-ostart), (U64)(ip-istart), /* streaming */ 0);
|
|
/* Allow caller to get size read */
|
|
DEBUGLOG(4, "ZSTD_decompressFrame: decompressed frame of size %zi, consuming %zi bytes of input", op-ostart, ip - (const BYTE*)*srcPtr);
|
|
*srcPtr = ip;
|
|
*srcSizePtr = remainingSrcSize;
|
|
return (size_t)(op-ostart);
|
|
}
|
|
|
|
static
|
|
ZSTD_ALLOW_POINTER_OVERFLOW_ATTR
|
|
size_t ZSTD_decompressMultiFrame(ZSTD_DCtx* dctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize,
|
|
const void* dict, size_t dictSize,
|
|
const ZSTD_DDict* ddict)
|
|
{
|
|
void* const dststart = dst;
|
|
int moreThan1Frame = 0;
|
|
|
|
DEBUGLOG(5, "ZSTD_decompressMultiFrame");
|
|
assert(dict==NULL || ddict==NULL); /* either dict or ddict set, not both */
|
|
|
|
if (ddict) {
|
|
dict = ZSTD_DDict_dictContent(ddict);
|
|
dictSize = ZSTD_DDict_dictSize(ddict);
|
|
}
|
|
|
|
while (srcSize >= ZSTD_startingInputLength(dctx->format)) {
|
|
|
|
#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT >= 1)
|
|
if (dctx->format == ZSTD_f_zstd1 && ZSTD_isLegacy(src, srcSize)) {
|
|
size_t decodedSize;
|
|
size_t const frameSize = ZSTD_findFrameCompressedSizeLegacy(src, srcSize);
|
|
if (ZSTD_isError(frameSize)) return frameSize;
|
|
RETURN_ERROR_IF(dctx->staticSize, memory_allocation,
|
|
"legacy support is not compatible with static dctx");
|
|
|
|
decodedSize = ZSTD_decompressLegacy(dst, dstCapacity, src, frameSize, dict, dictSize);
|
|
if (ZSTD_isError(decodedSize)) return decodedSize;
|
|
|
|
{
|
|
unsigned long long const expectedSize = ZSTD_getFrameContentSize(src, srcSize);
|
|
RETURN_ERROR_IF(expectedSize == ZSTD_CONTENTSIZE_ERROR, corruption_detected, "Corrupted frame header!");
|
|
if (expectedSize != ZSTD_CONTENTSIZE_UNKNOWN) {
|
|
RETURN_ERROR_IF(expectedSize != decodedSize, corruption_detected,
|
|
"Frame header size does not match decoded size!");
|
|
}
|
|
}
|
|
|
|
assert(decodedSize <= dstCapacity);
|
|
dst = (BYTE*)dst + decodedSize;
|
|
dstCapacity -= decodedSize;
|
|
|
|
src = (const BYTE*)src + frameSize;
|
|
srcSize -= frameSize;
|
|
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
if (dctx->format == ZSTD_f_zstd1 && srcSize >= 4) {
|
|
U32 const magicNumber = MEM_readLE32(src);
|
|
DEBUGLOG(5, "reading magic number %08X", (unsigned)magicNumber);
|
|
if ((magicNumber & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) {
|
|
/* skippable frame detected : skip it */
|
|
size_t const skippableSize = readSkippableFrameSize(src, srcSize);
|
|
FORWARD_IF_ERROR(skippableSize, "invalid skippable frame");
|
|
assert(skippableSize <= srcSize);
|
|
|
|
src = (const BYTE *)src + skippableSize;
|
|
srcSize -= skippableSize;
|
|
continue; /* check next frame */
|
|
} }
|
|
|
|
if (ddict) {
|
|
/* we were called from ZSTD_decompress_usingDDict */
|
|
FORWARD_IF_ERROR(ZSTD_decompressBegin_usingDDict(dctx, ddict), "");
|
|
} else {
|
|
/* this will initialize correctly with no dict if dict == NULL, so
|
|
* use this in all cases but ddict */
|
|
FORWARD_IF_ERROR(ZSTD_decompressBegin_usingDict(dctx, dict, dictSize), "");
|
|
}
|
|
ZSTD_checkContinuity(dctx, dst, dstCapacity);
|
|
|
|
{ const size_t res = ZSTD_decompressFrame(dctx, dst, dstCapacity,
|
|
&src, &srcSize);
|
|
RETURN_ERROR_IF(
|
|
(ZSTD_getErrorCode(res) == ZSTD_error_prefix_unknown)
|
|
&& (moreThan1Frame==1),
|
|
srcSize_wrong,
|
|
"At least one frame successfully completed, "
|
|
"but following bytes are garbage: "
|
|
"it's more likely to be a srcSize error, "
|
|
"specifying more input bytes than size of frame(s). "
|
|
"Note: one could be unlucky, it might be a corruption error instead, "
|
|
"happening right at the place where we expect zstd magic bytes. "
|
|
"But this is _much_ less likely than a srcSize field error.");
|
|
if (ZSTD_isError(res)) return res;
|
|
assert(res <= dstCapacity);
|
|
if (res != 0)
|
|
dst = (BYTE*)dst + res;
|
|
dstCapacity -= res;
|
|
}
|
|
moreThan1Frame = 1;
|
|
} /* while (srcSize >= ZSTD_frameHeaderSize_prefix) */
|
|
|
|
RETURN_ERROR_IF(srcSize, srcSize_wrong, "input not entirely consumed");
|
|
|
|
return (size_t)((BYTE*)dst - (BYTE*)dststart);
|
|
}
|
|
|
|
size_t ZSTD_decompress_usingDict(ZSTD_DCtx* dctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize,
|
|
const void* dict, size_t dictSize)
|
|
{
|
|
return ZSTD_decompressMultiFrame(dctx, dst, dstCapacity, src, srcSize, dict, dictSize, NULL);
|
|
}
|
|
|
|
|
|
static ZSTD_DDict const* ZSTD_getDDict(ZSTD_DCtx* dctx)
|
|
{
|
|
switch (dctx->dictUses) {
|
|
default:
|
|
assert(0 /* Impossible */);
|
|
ZSTD_FALLTHROUGH;
|
|
case ZSTD_dont_use:
|
|
ZSTD_clearDict(dctx);
|
|
return NULL;
|
|
case ZSTD_use_indefinitely:
|
|
return dctx->ddict;
|
|
case ZSTD_use_once:
|
|
dctx->dictUses = ZSTD_dont_use;
|
|
return dctx->ddict;
|
|
}
|
|
}
|
|
|
|
size_t ZSTD_decompressDCtx(ZSTD_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize)
|
|
{
|
|
return ZSTD_decompress_usingDDict(dctx, dst, dstCapacity, src, srcSize, ZSTD_getDDict(dctx));
|
|
}
|
|
|
|
|
|
size_t ZSTD_decompress(void* dst, size_t dstCapacity, const void* src, size_t srcSize)
|
|
{
|
|
#if defined(ZSTD_HEAPMODE) && (ZSTD_HEAPMODE>=1)
|
|
size_t regenSize;
|
|
ZSTD_DCtx* const dctx = ZSTD_createDCtx_internal(ZSTD_defaultCMem);
|
|
RETURN_ERROR_IF(dctx==NULL, memory_allocation, "NULL pointer!");
|
|
regenSize = ZSTD_decompressDCtx(dctx, dst, dstCapacity, src, srcSize);
|
|
ZSTD_freeDCtx(dctx);
|
|
return regenSize;
|
|
#else /* stack mode */
|
|
ZSTD_DCtx dctx;
|
|
ZSTD_initDCtx_internal(&dctx);
|
|
return ZSTD_decompressDCtx(&dctx, dst, dstCapacity, src, srcSize);
|
|
#endif
|
|
}
|
|
|
|
|
|
/*-**************************************
|
|
* Advanced Streaming Decompression API
|
|
* Bufferless and synchronous
|
|
****************************************/
|
|
size_t ZSTD_nextSrcSizeToDecompress(ZSTD_DCtx* dctx) { return dctx->expected; }
|
|
|
|
/**
|
|
* Similar to ZSTD_nextSrcSizeToDecompress(), but when a block input can be streamed, we
|
|
* allow taking a partial block as the input. Currently only raw uncompressed blocks can
|
|
* be streamed.
|
|
*
|
|
* For blocks that can be streamed, this allows us to reduce the latency until we produce
|
|
* output, and avoid copying the input.
|
|
*
|
|
* @param inputSize - The total amount of input that the caller currently has.
|
|
*/
|
|
static size_t ZSTD_nextSrcSizeToDecompressWithInputSize(ZSTD_DCtx* dctx, size_t inputSize) {
|
|
if (!(dctx->stage == ZSTDds_decompressBlock || dctx->stage == ZSTDds_decompressLastBlock))
|
|
return dctx->expected;
|
|
if (dctx->bType != bt_raw)
|
|
return dctx->expected;
|
|
return BOUNDED(1, inputSize, dctx->expected);
|
|
}
|
|
|
|
ZSTD_nextInputType_e ZSTD_nextInputType(ZSTD_DCtx* dctx) {
|
|
switch(dctx->stage)
|
|
{
|
|
default: /* should not happen */
|
|
assert(0);
|
|
ZSTD_FALLTHROUGH;
|
|
case ZSTDds_getFrameHeaderSize:
|
|
ZSTD_FALLTHROUGH;
|
|
case ZSTDds_decodeFrameHeader:
|
|
return ZSTDnit_frameHeader;
|
|
case ZSTDds_decodeBlockHeader:
|
|
return ZSTDnit_blockHeader;
|
|
case ZSTDds_decompressBlock:
|
|
return ZSTDnit_block;
|
|
case ZSTDds_decompressLastBlock:
|
|
return ZSTDnit_lastBlock;
|
|
case ZSTDds_checkChecksum:
|
|
return ZSTDnit_checksum;
|
|
case ZSTDds_decodeSkippableHeader:
|
|
ZSTD_FALLTHROUGH;
|
|
case ZSTDds_skipFrame:
|
|
return ZSTDnit_skippableFrame;
|
|
}
|
|
}
|
|
|
|
static int ZSTD_isSkipFrame(ZSTD_DCtx* dctx) { return dctx->stage == ZSTDds_skipFrame; }
|
|
|
|
/** ZSTD_decompressContinue() :
|
|
* srcSize : must be the exact nb of bytes expected (see ZSTD_nextSrcSizeToDecompress())
|
|
* @return : nb of bytes generated into `dst` (necessarily <= `dstCapacity)
|
|
* or an error code, which can be tested using ZSTD_isError() */
|
|
size_t ZSTD_decompressContinue(ZSTD_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize)
|
|
{
|
|
DEBUGLOG(5, "ZSTD_decompressContinue (srcSize:%u)", (unsigned)srcSize);
|
|
/* Sanity check */
|
|
RETURN_ERROR_IF(srcSize != ZSTD_nextSrcSizeToDecompressWithInputSize(dctx, srcSize), srcSize_wrong, "not allowed");
|
|
ZSTD_checkContinuity(dctx, dst, dstCapacity);
|
|
|
|
dctx->processedCSize += srcSize;
|
|
|
|
switch (dctx->stage)
|
|
{
|
|
case ZSTDds_getFrameHeaderSize :
|
|
assert(src != NULL);
|
|
if (dctx->format == ZSTD_f_zstd1) { /* allows header */
|
|
assert(srcSize >= ZSTD_FRAMEIDSIZE); /* to read skippable magic number */
|
|
if ((MEM_readLE32(src) & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) { /* skippable frame */
|
|
ZSTD_memcpy(dctx->headerBuffer, src, srcSize);
|
|
dctx->expected = ZSTD_SKIPPABLEHEADERSIZE - srcSize; /* remaining to load to get full skippable frame header */
|
|
dctx->stage = ZSTDds_decodeSkippableHeader;
|
|
return 0;
|
|
} }
|
|
dctx->headerSize = ZSTD_frameHeaderSize_internal(src, srcSize, dctx->format);
|
|
if (ZSTD_isError(dctx->headerSize)) return dctx->headerSize;
|
|
ZSTD_memcpy(dctx->headerBuffer, src, srcSize);
|
|
dctx->expected = dctx->headerSize - srcSize;
|
|
dctx->stage = ZSTDds_decodeFrameHeader;
|
|
return 0;
|
|
|
|
case ZSTDds_decodeFrameHeader:
|
|
assert(src != NULL);
|
|
ZSTD_memcpy(dctx->headerBuffer + (dctx->headerSize - srcSize), src, srcSize);
|
|
FORWARD_IF_ERROR(ZSTD_decodeFrameHeader(dctx, dctx->headerBuffer, dctx->headerSize), "");
|
|
dctx->expected = ZSTD_blockHeaderSize;
|
|
dctx->stage = ZSTDds_decodeBlockHeader;
|
|
return 0;
|
|
|
|
case ZSTDds_decodeBlockHeader:
|
|
{ blockProperties_t bp;
|
|
size_t const cBlockSize = ZSTD_getcBlockSize(src, ZSTD_blockHeaderSize, &bp);
|
|
if (ZSTD_isError(cBlockSize)) return cBlockSize;
|
|
RETURN_ERROR_IF(cBlockSize > dctx->fParams.blockSizeMax, corruption_detected, "Block Size Exceeds Maximum");
|
|
dctx->expected = cBlockSize;
|
|
dctx->bType = bp.blockType;
|
|
dctx->rleSize = bp.origSize;
|
|
if (cBlockSize) {
|
|
dctx->stage = bp.lastBlock ? ZSTDds_decompressLastBlock : ZSTDds_decompressBlock;
|
|
return 0;
|
|
}
|
|
/* empty block */
|
|
if (bp.lastBlock) {
|
|
if (dctx->fParams.checksumFlag) {
|
|
dctx->expected = 4;
|
|
dctx->stage = ZSTDds_checkChecksum;
|
|
} else {
|
|
dctx->expected = 0; /* end of frame */
|
|
dctx->stage = ZSTDds_getFrameHeaderSize;
|
|
}
|
|
} else {
|
|
dctx->expected = ZSTD_blockHeaderSize; /* jump to next header */
|
|
dctx->stage = ZSTDds_decodeBlockHeader;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
case ZSTDds_decompressLastBlock:
|
|
case ZSTDds_decompressBlock:
|
|
DEBUGLOG(5, "ZSTD_decompressContinue: case ZSTDds_decompressBlock");
|
|
{ size_t rSize;
|
|
switch(dctx->bType)
|
|
{
|
|
case bt_compressed:
|
|
DEBUGLOG(5, "ZSTD_decompressContinue: case bt_compressed");
|
|
assert(dctx->isFrameDecompression == 1);
|
|
rSize = ZSTD_decompressBlock_internal(dctx, dst, dstCapacity, src, srcSize, is_streaming);
|
|
dctx->expected = 0; /* Streaming not supported */
|
|
break;
|
|
case bt_raw :
|
|
assert(srcSize <= dctx->expected);
|
|
rSize = ZSTD_copyRawBlock(dst, dstCapacity, src, srcSize);
|
|
FORWARD_IF_ERROR(rSize, "ZSTD_copyRawBlock failed");
|
|
assert(rSize == srcSize);
|
|
dctx->expected -= rSize;
|
|
break;
|
|
case bt_rle :
|
|
rSize = ZSTD_setRleBlock(dst, dstCapacity, *(const BYTE*)src, dctx->rleSize);
|
|
dctx->expected = 0; /* Streaming not supported */
|
|
break;
|
|
case bt_reserved : /* should never happen */
|
|
default:
|
|
RETURN_ERROR(corruption_detected, "invalid block type");
|
|
}
|
|
FORWARD_IF_ERROR(rSize, "");
|
|
RETURN_ERROR_IF(rSize > dctx->fParams.blockSizeMax, corruption_detected, "Decompressed Block Size Exceeds Maximum");
|
|
DEBUGLOG(5, "ZSTD_decompressContinue: decoded size from block : %u", (unsigned)rSize);
|
|
dctx->decodedSize += rSize;
|
|
if (dctx->validateChecksum) XXH64_update(&dctx->xxhState, dst, rSize);
|
|
dctx->previousDstEnd = (char*)dst + rSize;
|
|
|
|
/* Stay on the same stage until we are finished streaming the block. */
|
|
if (dctx->expected > 0) {
|
|
return rSize;
|
|
}
|
|
|
|
if (dctx->stage == ZSTDds_decompressLastBlock) { /* end of frame */
|
|
DEBUGLOG(4, "ZSTD_decompressContinue: decoded size from frame : %u", (unsigned)dctx->decodedSize);
|
|
RETURN_ERROR_IF(
|
|
dctx->fParams.frameContentSize != ZSTD_CONTENTSIZE_UNKNOWN
|
|
&& dctx->decodedSize != dctx->fParams.frameContentSize,
|
|
corruption_detected, "");
|
|
if (dctx->fParams.checksumFlag) { /* another round for frame checksum */
|
|
dctx->expected = 4;
|
|
dctx->stage = ZSTDds_checkChecksum;
|
|
} else {
|
|
ZSTD_DCtx_trace_end(dctx, dctx->decodedSize, dctx->processedCSize, /* streaming */ 1);
|
|
dctx->expected = 0; /* ends here */
|
|
dctx->stage = ZSTDds_getFrameHeaderSize;
|
|
}
|
|
} else {
|
|
dctx->stage = ZSTDds_decodeBlockHeader;
|
|
dctx->expected = ZSTD_blockHeaderSize;
|
|
}
|
|
return rSize;
|
|
}
|
|
|
|
case ZSTDds_checkChecksum:
|
|
assert(srcSize == 4); /* guaranteed by dctx->expected */
|
|
{
|
|
if (dctx->validateChecksum) {
|
|
U32 const h32 = (U32)XXH64_digest(&dctx->xxhState);
|
|
U32 const check32 = MEM_readLE32(src);
|
|
DEBUGLOG(4, "ZSTD_decompressContinue: checksum : calculated %08X :: %08X read", (unsigned)h32, (unsigned)check32);
|
|
RETURN_ERROR_IF(check32 != h32, checksum_wrong, "");
|
|
}
|
|
ZSTD_DCtx_trace_end(dctx, dctx->decodedSize, dctx->processedCSize, /* streaming */ 1);
|
|
dctx->expected = 0;
|
|
dctx->stage = ZSTDds_getFrameHeaderSize;
|
|
return 0;
|
|
}
|
|
|
|
case ZSTDds_decodeSkippableHeader:
|
|
assert(src != NULL);
|
|
assert(srcSize <= ZSTD_SKIPPABLEHEADERSIZE);
|
|
assert(dctx->format != ZSTD_f_zstd1_magicless);
|
|
ZSTD_memcpy(dctx->headerBuffer + (ZSTD_SKIPPABLEHEADERSIZE - srcSize), src, srcSize); /* complete skippable header */
|
|
dctx->expected = MEM_readLE32(dctx->headerBuffer + ZSTD_FRAMEIDSIZE); /* note : dctx->expected can grow seriously large, beyond local buffer size */
|
|
dctx->stage = ZSTDds_skipFrame;
|
|
return 0;
|
|
|
|
case ZSTDds_skipFrame:
|
|
dctx->expected = 0;
|
|
dctx->stage = ZSTDds_getFrameHeaderSize;
|
|
return 0;
|
|
|
|
default:
|
|
assert(0); /* impossible */
|
|
RETURN_ERROR(GENERIC, "impossible to reach"); /* some compilers require default to do something */
|
|
}
|
|
}
|
|
|
|
|
|
static size_t ZSTD_refDictContent(ZSTD_DCtx* dctx, const void* dict, size_t dictSize)
|
|
{
|
|
dctx->dictEnd = dctx->previousDstEnd;
|
|
dctx->virtualStart = (const char*)dict - ((const char*)(dctx->previousDstEnd) - (const char*)(dctx->prefixStart));
|
|
dctx->prefixStart = dict;
|
|
dctx->previousDstEnd = (const char*)dict + dictSize;
|
|
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
|
|
dctx->dictContentBeginForFuzzing = dctx->prefixStart;
|
|
dctx->dictContentEndForFuzzing = dctx->previousDstEnd;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/*! ZSTD_loadDEntropy() :
|
|
* dict : must point at beginning of a valid zstd dictionary.
|
|
* @return : size of entropy tables read */
|
|
size_t
|
|
ZSTD_loadDEntropy(ZSTD_entropyDTables_t* entropy,
|
|
const void* const dict, size_t const dictSize)
|
|
{
|
|
const BYTE* dictPtr = (const BYTE*)dict;
|
|
const BYTE* const dictEnd = dictPtr + dictSize;
|
|
|
|
RETURN_ERROR_IF(dictSize <= 8, dictionary_corrupted, "dict is too small");
|
|
assert(MEM_readLE32(dict) == ZSTD_MAGIC_DICTIONARY); /* dict must be valid */
|
|
dictPtr += 8; /* skip header = magic + dictID */
|
|
|
|
ZSTD_STATIC_ASSERT(offsetof(ZSTD_entropyDTables_t, OFTable) == offsetof(ZSTD_entropyDTables_t, LLTable) + sizeof(entropy->LLTable));
|
|
ZSTD_STATIC_ASSERT(offsetof(ZSTD_entropyDTables_t, MLTable) == offsetof(ZSTD_entropyDTables_t, OFTable) + sizeof(entropy->OFTable));
|
|
ZSTD_STATIC_ASSERT(sizeof(entropy->LLTable) + sizeof(entropy->OFTable) + sizeof(entropy->MLTable) >= HUF_DECOMPRESS_WORKSPACE_SIZE);
|
|
{ void* const workspace = &entropy->LLTable; /* use fse tables as temporary workspace; implies fse tables are grouped together */
|
|
size_t const workspaceSize = sizeof(entropy->LLTable) + sizeof(entropy->OFTable) + sizeof(entropy->MLTable);
|
|
#ifdef HUF_FORCE_DECOMPRESS_X1
|
|
/* in minimal huffman, we always use X1 variants */
|
|
size_t const hSize = HUF_readDTableX1_wksp(entropy->hufTable,
|
|
dictPtr, dictEnd - dictPtr,
|
|
workspace, workspaceSize, /* flags */ 0);
|
|
#else
|
|
size_t const hSize = HUF_readDTableX2_wksp(entropy->hufTable,
|
|
dictPtr, (size_t)(dictEnd - dictPtr),
|
|
workspace, workspaceSize, /* flags */ 0);
|
|
#endif
|
|
RETURN_ERROR_IF(HUF_isError(hSize), dictionary_corrupted, "");
|
|
dictPtr += hSize;
|
|
}
|
|
|
|
{ short offcodeNCount[MaxOff+1];
|
|
unsigned offcodeMaxValue = MaxOff, offcodeLog;
|
|
size_t const offcodeHeaderSize = FSE_readNCount(offcodeNCount, &offcodeMaxValue, &offcodeLog, dictPtr, (size_t)(dictEnd-dictPtr));
|
|
RETURN_ERROR_IF(FSE_isError(offcodeHeaderSize), dictionary_corrupted, "");
|
|
RETURN_ERROR_IF(offcodeMaxValue > MaxOff, dictionary_corrupted, "");
|
|
RETURN_ERROR_IF(offcodeLog > OffFSELog, dictionary_corrupted, "");
|
|
ZSTD_buildFSETable( entropy->OFTable,
|
|
offcodeNCount, offcodeMaxValue,
|
|
OF_base, OF_bits,
|
|
offcodeLog,
|
|
entropy->workspace, sizeof(entropy->workspace),
|
|
/* bmi2 */0);
|
|
dictPtr += offcodeHeaderSize;
|
|
}
|
|
|
|
{ short matchlengthNCount[MaxML+1];
|
|
unsigned matchlengthMaxValue = MaxML, matchlengthLog;
|
|
size_t const matchlengthHeaderSize = FSE_readNCount(matchlengthNCount, &matchlengthMaxValue, &matchlengthLog, dictPtr, (size_t)(dictEnd-dictPtr));
|
|
RETURN_ERROR_IF(FSE_isError(matchlengthHeaderSize), dictionary_corrupted, "");
|
|
RETURN_ERROR_IF(matchlengthMaxValue > MaxML, dictionary_corrupted, "");
|
|
RETURN_ERROR_IF(matchlengthLog > MLFSELog, dictionary_corrupted, "");
|
|
ZSTD_buildFSETable( entropy->MLTable,
|
|
matchlengthNCount, matchlengthMaxValue,
|
|
ML_base, ML_bits,
|
|
matchlengthLog,
|
|
entropy->workspace, sizeof(entropy->workspace),
|
|
/* bmi2 */ 0);
|
|
dictPtr += matchlengthHeaderSize;
|
|
}
|
|
|
|
{ short litlengthNCount[MaxLL+1];
|
|
unsigned litlengthMaxValue = MaxLL, litlengthLog;
|
|
size_t const litlengthHeaderSize = FSE_readNCount(litlengthNCount, &litlengthMaxValue, &litlengthLog, dictPtr, (size_t)(dictEnd-dictPtr));
|
|
RETURN_ERROR_IF(FSE_isError(litlengthHeaderSize), dictionary_corrupted, "");
|
|
RETURN_ERROR_IF(litlengthMaxValue > MaxLL, dictionary_corrupted, "");
|
|
RETURN_ERROR_IF(litlengthLog > LLFSELog, dictionary_corrupted, "");
|
|
ZSTD_buildFSETable( entropy->LLTable,
|
|
litlengthNCount, litlengthMaxValue,
|
|
LL_base, LL_bits,
|
|
litlengthLog,
|
|
entropy->workspace, sizeof(entropy->workspace),
|
|
/* bmi2 */ 0);
|
|
dictPtr += litlengthHeaderSize;
|
|
}
|
|
|
|
RETURN_ERROR_IF(dictPtr+12 > dictEnd, dictionary_corrupted, "");
|
|
{ int i;
|
|
size_t const dictContentSize = (size_t)(dictEnd - (dictPtr+12));
|
|
for (i=0; i<3; i++) {
|
|
U32 const rep = MEM_readLE32(dictPtr); dictPtr += 4;
|
|
RETURN_ERROR_IF(rep==0 || rep > dictContentSize,
|
|
dictionary_corrupted, "");
|
|
entropy->rep[i] = rep;
|
|
} }
|
|
|
|
return (size_t)(dictPtr - (const BYTE*)dict);
|
|
}
|
|
|
|
static size_t ZSTD_decompress_insertDictionary(ZSTD_DCtx* dctx, const void* dict, size_t dictSize)
|
|
{
|
|
if (dictSize < 8) return ZSTD_refDictContent(dctx, dict, dictSize);
|
|
{ U32 const magic = MEM_readLE32(dict);
|
|
if (magic != ZSTD_MAGIC_DICTIONARY) {
|
|
return ZSTD_refDictContent(dctx, dict, dictSize); /* pure content mode */
|
|
} }
|
|
dctx->dictID = MEM_readLE32((const char*)dict + ZSTD_FRAMEIDSIZE);
|
|
|
|
/* load entropy tables */
|
|
{ size_t const eSize = ZSTD_loadDEntropy(&dctx->entropy, dict, dictSize);
|
|
RETURN_ERROR_IF(ZSTD_isError(eSize), dictionary_corrupted, "");
|
|
dict = (const char*)dict + eSize;
|
|
dictSize -= eSize;
|
|
}
|
|
dctx->litEntropy = dctx->fseEntropy = 1;
|
|
|
|
/* reference dictionary content */
|
|
return ZSTD_refDictContent(dctx, dict, dictSize);
|
|
}
|
|
|
|
size_t ZSTD_decompressBegin(ZSTD_DCtx* dctx)
|
|
{
|
|
assert(dctx != NULL);
|
|
#if ZSTD_TRACE
|
|
dctx->traceCtx = (ZSTD_trace_decompress_begin != NULL) ? ZSTD_trace_decompress_begin(dctx) : 0;
|
|
#endif
|
|
dctx->expected = ZSTD_startingInputLength(dctx->format); /* dctx->format must be properly set */
|
|
dctx->stage = ZSTDds_getFrameHeaderSize;
|
|
dctx->processedCSize = 0;
|
|
dctx->decodedSize = 0;
|
|
dctx->previousDstEnd = NULL;
|
|
dctx->prefixStart = NULL;
|
|
dctx->virtualStart = NULL;
|
|
dctx->dictEnd = NULL;
|
|
dctx->entropy.hufTable[0] = (HUF_DTable)((ZSTD_HUFFDTABLE_CAPACITY_LOG)*0x1000001); /* cover both little and big endian */
|
|
dctx->litEntropy = dctx->fseEntropy = 0;
|
|
dctx->dictID = 0;
|
|
dctx->bType = bt_reserved;
|
|
dctx->isFrameDecompression = 1;
|
|
ZSTD_STATIC_ASSERT(sizeof(dctx->entropy.rep) == sizeof(repStartValue));
|
|
ZSTD_memcpy(dctx->entropy.rep, repStartValue, sizeof(repStartValue)); /* initial repcodes */
|
|
dctx->LLTptr = dctx->entropy.LLTable;
|
|
dctx->MLTptr = dctx->entropy.MLTable;
|
|
dctx->OFTptr = dctx->entropy.OFTable;
|
|
dctx->HUFptr = dctx->entropy.hufTable;
|
|
return 0;
|
|
}
|
|
|
|
size_t ZSTD_decompressBegin_usingDict(ZSTD_DCtx* dctx, const void* dict, size_t dictSize)
|
|
{
|
|
FORWARD_IF_ERROR( ZSTD_decompressBegin(dctx) , "");
|
|
if (dict && dictSize)
|
|
RETURN_ERROR_IF(
|
|
ZSTD_isError(ZSTD_decompress_insertDictionary(dctx, dict, dictSize)),
|
|
dictionary_corrupted, "");
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* ====== ZSTD_DDict ====== */
|
|
|
|
size_t ZSTD_decompressBegin_usingDDict(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_decompressBegin_usingDDict");
|
|
assert(dctx != NULL);
|
|
if (ddict) {
|
|
const char* const dictStart = (const char*)ZSTD_DDict_dictContent(ddict);
|
|
size_t const dictSize = ZSTD_DDict_dictSize(ddict);
|
|
const void* const dictEnd = dictStart + dictSize;
|
|
dctx->ddictIsCold = (dctx->dictEnd != dictEnd);
|
|
DEBUGLOG(4, "DDict is %s",
|
|
dctx->ddictIsCold ? "~cold~" : "hot!");
|
|
}
|
|
FORWARD_IF_ERROR( ZSTD_decompressBegin(dctx) , "");
|
|
if (ddict) { /* NULL ddict is equivalent to no dictionary */
|
|
ZSTD_copyDDictParameters(dctx, ddict);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*! ZSTD_getDictID_fromDict() :
|
|
* Provides the dictID stored within dictionary.
|
|
* if @return == 0, the dictionary is not conformant with Zstandard specification.
|
|
* It can still be loaded, but as a content-only dictionary. */
|
|
unsigned ZSTD_getDictID_fromDict(const void* dict, size_t dictSize)
|
|
{
|
|
if (dictSize < 8) return 0;
|
|
if (MEM_readLE32(dict) != ZSTD_MAGIC_DICTIONARY) return 0;
|
|
return MEM_readLE32((const char*)dict + ZSTD_FRAMEIDSIZE);
|
|
}
|
|
|
|
/*! ZSTD_getDictID_fromFrame() :
|
|
* Provides the dictID required to decompress frame stored within `src`.
|
|
* If @return == 0, the dictID could not be decoded.
|
|
* This could for one of the following reasons :
|
|
* - The frame does not require a dictionary (most common case).
|
|
* - The frame was built with dictID intentionally removed.
|
|
* Needed dictionary is a hidden piece of information.
|
|
* Note : this use case also happens when using a non-conformant dictionary.
|
|
* - `srcSize` is too small, and as a result, frame header could not be decoded.
|
|
* Note : possible if `srcSize < ZSTD_FRAMEHEADERSIZE_MAX`.
|
|
* - This is not a Zstandard frame.
|
|
* When identifying the exact failure cause, it's possible to use
|
|
* ZSTD_getFrameHeader(), which will provide a more precise error code. */
|
|
unsigned ZSTD_getDictID_fromFrame(const void* src, size_t srcSize)
|
|
{
|
|
ZSTD_frameHeader zfp = { 0, 0, 0, ZSTD_frame, 0, 0, 0, 0, 0 };
|
|
size_t const hError = ZSTD_getFrameHeader(&zfp, src, srcSize);
|
|
if (ZSTD_isError(hError)) return 0;
|
|
return zfp.dictID;
|
|
}
|
|
|
|
|
|
/*! ZSTD_decompress_usingDDict() :
|
|
* Decompression using a pre-digested Dictionary
|
|
* Use dictionary without significant overhead. */
|
|
size_t ZSTD_decompress_usingDDict(ZSTD_DCtx* dctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize,
|
|
const ZSTD_DDict* ddict)
|
|
{
|
|
/* pass content and size in case legacy frames are encountered */
|
|
return ZSTD_decompressMultiFrame(dctx, dst, dstCapacity, src, srcSize,
|
|
NULL, 0,
|
|
ddict);
|
|
}
|
|
|
|
|
|
/*=====================================
|
|
* Streaming decompression
|
|
*====================================*/
|
|
|
|
ZSTD_DStream* ZSTD_createDStream(void)
|
|
{
|
|
DEBUGLOG(3, "ZSTD_createDStream");
|
|
return ZSTD_createDCtx_internal(ZSTD_defaultCMem);
|
|
}
|
|
|
|
ZSTD_DStream* ZSTD_initStaticDStream(void *workspace, size_t workspaceSize)
|
|
{
|
|
return ZSTD_initStaticDCtx(workspace, workspaceSize);
|
|
}
|
|
|
|
ZSTD_DStream* ZSTD_createDStream_advanced(ZSTD_customMem customMem)
|
|
{
|
|
return ZSTD_createDCtx_internal(customMem);
|
|
}
|
|
|
|
size_t ZSTD_freeDStream(ZSTD_DStream* zds)
|
|
{
|
|
return ZSTD_freeDCtx(zds);
|
|
}
|
|
|
|
|
|
/* *** Initialization *** */
|
|
|
|
size_t ZSTD_DStreamInSize(void) { return ZSTD_BLOCKSIZE_MAX + ZSTD_blockHeaderSize; }
|
|
size_t ZSTD_DStreamOutSize(void) { return ZSTD_BLOCKSIZE_MAX; }
|
|
|
|
size_t ZSTD_DCtx_loadDictionary_advanced(ZSTD_DCtx* dctx,
|
|
const void* dict, size_t dictSize,
|
|
ZSTD_dictLoadMethod_e dictLoadMethod,
|
|
ZSTD_dictContentType_e dictContentType)
|
|
{
|
|
RETURN_ERROR_IF(dctx->streamStage != zdss_init, stage_wrong, "");
|
|
ZSTD_clearDict(dctx);
|
|
if (dict && dictSize != 0) {
|
|
dctx->ddictLocal = ZSTD_createDDict_advanced(dict, dictSize, dictLoadMethod, dictContentType, dctx->customMem);
|
|
RETURN_ERROR_IF(dctx->ddictLocal == NULL, memory_allocation, "NULL pointer!");
|
|
dctx->ddict = dctx->ddictLocal;
|
|
dctx->dictUses = ZSTD_use_indefinitely;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
size_t ZSTD_DCtx_loadDictionary_byReference(ZSTD_DCtx* dctx, const void* dict, size_t dictSize)
|
|
{
|
|
return ZSTD_DCtx_loadDictionary_advanced(dctx, dict, dictSize, ZSTD_dlm_byRef, ZSTD_dct_auto);
|
|
}
|
|
|
|
size_t ZSTD_DCtx_loadDictionary(ZSTD_DCtx* dctx, const void* dict, size_t dictSize)
|
|
{
|
|
return ZSTD_DCtx_loadDictionary_advanced(dctx, dict, dictSize, ZSTD_dlm_byCopy, ZSTD_dct_auto);
|
|
}
|
|
|
|
size_t ZSTD_DCtx_refPrefix_advanced(ZSTD_DCtx* dctx, const void* prefix, size_t prefixSize, ZSTD_dictContentType_e dictContentType)
|
|
{
|
|
FORWARD_IF_ERROR(ZSTD_DCtx_loadDictionary_advanced(dctx, prefix, prefixSize, ZSTD_dlm_byRef, dictContentType), "");
|
|
dctx->dictUses = ZSTD_use_once;
|
|
return 0;
|
|
}
|
|
|
|
size_t ZSTD_DCtx_refPrefix(ZSTD_DCtx* dctx, const void* prefix, size_t prefixSize)
|
|
{
|
|
return ZSTD_DCtx_refPrefix_advanced(dctx, prefix, prefixSize, ZSTD_dct_rawContent);
|
|
}
|
|
|
|
|
|
/* ZSTD_initDStream_usingDict() :
|
|
* return : expected size, aka ZSTD_startingInputLength().
|
|
* this function cannot fail */
|
|
size_t ZSTD_initDStream_usingDict(ZSTD_DStream* zds, const void* dict, size_t dictSize)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_initDStream_usingDict");
|
|
FORWARD_IF_ERROR( ZSTD_DCtx_reset(zds, ZSTD_reset_session_only) , "");
|
|
FORWARD_IF_ERROR( ZSTD_DCtx_loadDictionary(zds, dict, dictSize) , "");
|
|
return ZSTD_startingInputLength(zds->format);
|
|
}
|
|
|
|
/* note : this variant can't fail */
|
|
size_t ZSTD_initDStream(ZSTD_DStream* zds)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_initDStream");
|
|
FORWARD_IF_ERROR(ZSTD_DCtx_reset(zds, ZSTD_reset_session_only), "");
|
|
FORWARD_IF_ERROR(ZSTD_DCtx_refDDict(zds, NULL), "");
|
|
return ZSTD_startingInputLength(zds->format);
|
|
}
|
|
|
|
/* ZSTD_initDStream_usingDDict() :
|
|
* ddict will just be referenced, and must outlive decompression session
|
|
* this function cannot fail */
|
|
size_t ZSTD_initDStream_usingDDict(ZSTD_DStream* dctx, const ZSTD_DDict* ddict)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_initDStream_usingDDict");
|
|
FORWARD_IF_ERROR( ZSTD_DCtx_reset(dctx, ZSTD_reset_session_only) , "");
|
|
FORWARD_IF_ERROR( ZSTD_DCtx_refDDict(dctx, ddict) , "");
|
|
return ZSTD_startingInputLength(dctx->format);
|
|
}
|
|
|
|
/* ZSTD_resetDStream() :
|
|
* return : expected size, aka ZSTD_startingInputLength().
|
|
* this function cannot fail */
|
|
size_t ZSTD_resetDStream(ZSTD_DStream* dctx)
|
|
{
|
|
DEBUGLOG(4, "ZSTD_resetDStream");
|
|
FORWARD_IF_ERROR(ZSTD_DCtx_reset(dctx, ZSTD_reset_session_only), "");
|
|
return ZSTD_startingInputLength(dctx->format);
|
|
}
|
|
|
|
|
|
size_t ZSTD_DCtx_refDDict(ZSTD_DCtx* dctx, const ZSTD_DDict* ddict)
|
|
{
|
|
RETURN_ERROR_IF(dctx->streamStage != zdss_init, stage_wrong, "");
|
|
ZSTD_clearDict(dctx);
|
|
if (ddict) {
|
|
dctx->ddict = ddict;
|
|
dctx->dictUses = ZSTD_use_indefinitely;
|
|
if (dctx->refMultipleDDicts == ZSTD_rmd_refMultipleDDicts) {
|
|
if (dctx->ddictSet == NULL) {
|
|
dctx->ddictSet = ZSTD_createDDictHashSet(dctx->customMem);
|
|
if (!dctx->ddictSet) {
|
|
RETURN_ERROR(memory_allocation, "Failed to allocate memory for hash set!");
|
|
}
|
|
}
|
|
assert(!dctx->staticSize); /* Impossible: ddictSet cannot have been allocated if static dctx */
|
|
FORWARD_IF_ERROR(ZSTD_DDictHashSet_addDDict(dctx->ddictSet, ddict, dctx->customMem), "");
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* ZSTD_DCtx_setMaxWindowSize() :
|
|
* note : no direct equivalence in ZSTD_DCtx_setParameter,
|
|
* since this version sets windowSize, and the other sets windowLog */
|
|
size_t ZSTD_DCtx_setMaxWindowSize(ZSTD_DCtx* dctx, size_t maxWindowSize)
|
|
{
|
|
ZSTD_bounds const bounds = ZSTD_dParam_getBounds(ZSTD_d_windowLogMax);
|
|
size_t const min = (size_t)1 << bounds.lowerBound;
|
|
size_t const max = (size_t)1 << bounds.upperBound;
|
|
RETURN_ERROR_IF(dctx->streamStage != zdss_init, stage_wrong, "");
|
|
RETURN_ERROR_IF(maxWindowSize < min, parameter_outOfBound, "");
|
|
RETURN_ERROR_IF(maxWindowSize > max, parameter_outOfBound, "");
|
|
dctx->maxWindowSize = maxWindowSize;
|
|
return 0;
|
|
}
|
|
|
|
size_t ZSTD_DCtx_setFormat(ZSTD_DCtx* dctx, ZSTD_format_e format)
|
|
{
|
|
return ZSTD_DCtx_setParameter(dctx, ZSTD_d_format, (int)format);
|
|
}
|
|
|
|
ZSTD_bounds ZSTD_dParam_getBounds(ZSTD_dParameter dParam)
|
|
{
|
|
ZSTD_bounds bounds = { 0, 0, 0 };
|
|
switch(dParam) {
|
|
case ZSTD_d_windowLogMax:
|
|
bounds.lowerBound = ZSTD_WINDOWLOG_ABSOLUTEMIN;
|
|
bounds.upperBound = ZSTD_WINDOWLOG_MAX;
|
|
return bounds;
|
|
case ZSTD_d_format:
|
|
bounds.lowerBound = (int)ZSTD_f_zstd1;
|
|
bounds.upperBound = (int)ZSTD_f_zstd1_magicless;
|
|
ZSTD_STATIC_ASSERT(ZSTD_f_zstd1 < ZSTD_f_zstd1_magicless);
|
|
return bounds;
|
|
case ZSTD_d_stableOutBuffer:
|
|
bounds.lowerBound = (int)ZSTD_bm_buffered;
|
|
bounds.upperBound = (int)ZSTD_bm_stable;
|
|
return bounds;
|
|
case ZSTD_d_forceIgnoreChecksum:
|
|
bounds.lowerBound = (int)ZSTD_d_validateChecksum;
|
|
bounds.upperBound = (int)ZSTD_d_ignoreChecksum;
|
|
return bounds;
|
|
case ZSTD_d_refMultipleDDicts:
|
|
bounds.lowerBound = (int)ZSTD_rmd_refSingleDDict;
|
|
bounds.upperBound = (int)ZSTD_rmd_refMultipleDDicts;
|
|
return bounds;
|
|
case ZSTD_d_disableHuffmanAssembly:
|
|
bounds.lowerBound = 0;
|
|
bounds.upperBound = 1;
|
|
return bounds;
|
|
case ZSTD_d_maxBlockSize:
|
|
bounds.lowerBound = ZSTD_BLOCKSIZE_MAX_MIN;
|
|
bounds.upperBound = ZSTD_BLOCKSIZE_MAX;
|
|
return bounds;
|
|
|
|
default:;
|
|
}
|
|
bounds.error = ERROR(parameter_unsupported);
|
|
return bounds;
|
|
}
|
|
|
|
/* ZSTD_dParam_withinBounds:
|
|
* @return 1 if value is within dParam bounds,
|
|
* 0 otherwise */
|
|
static int ZSTD_dParam_withinBounds(ZSTD_dParameter dParam, int value)
|
|
{
|
|
ZSTD_bounds const bounds = ZSTD_dParam_getBounds(dParam);
|
|
if (ZSTD_isError(bounds.error)) return 0;
|
|
if (value < bounds.lowerBound) return 0;
|
|
if (value > bounds.upperBound) return 0;
|
|
return 1;
|
|
}
|
|
|
|
#define CHECK_DBOUNDS(p,v) { \
|
|
RETURN_ERROR_IF(!ZSTD_dParam_withinBounds(p, v), parameter_outOfBound, ""); \
|
|
}
|
|
|
|
size_t ZSTD_DCtx_getParameter(ZSTD_DCtx* dctx, ZSTD_dParameter param, int* value)
|
|
{
|
|
switch (param) {
|
|
case ZSTD_d_windowLogMax:
|
|
*value = (int)ZSTD_highbit32((U32)dctx->maxWindowSize);
|
|
return 0;
|
|
case ZSTD_d_format:
|
|
*value = (int)dctx->format;
|
|
return 0;
|
|
case ZSTD_d_stableOutBuffer:
|
|
*value = (int)dctx->outBufferMode;
|
|
return 0;
|
|
case ZSTD_d_forceIgnoreChecksum:
|
|
*value = (int)dctx->forceIgnoreChecksum;
|
|
return 0;
|
|
case ZSTD_d_refMultipleDDicts:
|
|
*value = (int)dctx->refMultipleDDicts;
|
|
return 0;
|
|
case ZSTD_d_disableHuffmanAssembly:
|
|
*value = (int)dctx->disableHufAsm;
|
|
return 0;
|
|
case ZSTD_d_maxBlockSize:
|
|
*value = dctx->maxBlockSizeParam;
|
|
return 0;
|
|
default:;
|
|
}
|
|
RETURN_ERROR(parameter_unsupported, "");
|
|
}
|
|
|
|
size_t ZSTD_DCtx_setParameter(ZSTD_DCtx* dctx, ZSTD_dParameter dParam, int value)
|
|
{
|
|
RETURN_ERROR_IF(dctx->streamStage != zdss_init, stage_wrong, "");
|
|
switch(dParam) {
|
|
case ZSTD_d_windowLogMax:
|
|
if (value == 0) value = ZSTD_WINDOWLOG_LIMIT_DEFAULT;
|
|
CHECK_DBOUNDS(ZSTD_d_windowLogMax, value);
|
|
dctx->maxWindowSize = ((size_t)1) << value;
|
|
return 0;
|
|
case ZSTD_d_format:
|
|
CHECK_DBOUNDS(ZSTD_d_format, value);
|
|
dctx->format = (ZSTD_format_e)value;
|
|
return 0;
|
|
case ZSTD_d_stableOutBuffer:
|
|
CHECK_DBOUNDS(ZSTD_d_stableOutBuffer, value);
|
|
dctx->outBufferMode = (ZSTD_bufferMode_e)value;
|
|
return 0;
|
|
case ZSTD_d_forceIgnoreChecksum:
|
|
CHECK_DBOUNDS(ZSTD_d_forceIgnoreChecksum, value);
|
|
dctx->forceIgnoreChecksum = (ZSTD_forceIgnoreChecksum_e)value;
|
|
return 0;
|
|
case ZSTD_d_refMultipleDDicts:
|
|
CHECK_DBOUNDS(ZSTD_d_refMultipleDDicts, value);
|
|
if (dctx->staticSize != 0) {
|
|
RETURN_ERROR(parameter_unsupported, "Static dctx does not support multiple DDicts!");
|
|
}
|
|
dctx->refMultipleDDicts = (ZSTD_refMultipleDDicts_e)value;
|
|
return 0;
|
|
case ZSTD_d_disableHuffmanAssembly:
|
|
CHECK_DBOUNDS(ZSTD_d_disableHuffmanAssembly, value);
|
|
dctx->disableHufAsm = value != 0;
|
|
return 0;
|
|
case ZSTD_d_maxBlockSize:
|
|
if (value != 0) CHECK_DBOUNDS(ZSTD_d_maxBlockSize, value);
|
|
dctx->maxBlockSizeParam = value;
|
|
return 0;
|
|
default:;
|
|
}
|
|
RETURN_ERROR(parameter_unsupported, "");
|
|
}
|
|
|
|
size_t ZSTD_DCtx_reset(ZSTD_DCtx* dctx, ZSTD_ResetDirective reset)
|
|
{
|
|
if ( (reset == ZSTD_reset_session_only)
|
|
|| (reset == ZSTD_reset_session_and_parameters) ) {
|
|
dctx->streamStage = zdss_init;
|
|
dctx->noForwardProgress = 0;
|
|
dctx->isFrameDecompression = 1;
|
|
}
|
|
if ( (reset == ZSTD_reset_parameters)
|
|
|| (reset == ZSTD_reset_session_and_parameters) ) {
|
|
RETURN_ERROR_IF(dctx->streamStage != zdss_init, stage_wrong, "");
|
|
ZSTD_clearDict(dctx);
|
|
ZSTD_DCtx_resetParameters(dctx);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
size_t ZSTD_sizeof_DStream(const ZSTD_DStream* dctx)
|
|
{
|
|
return ZSTD_sizeof_DCtx(dctx);
|
|
}
|
|
|
|
static size_t ZSTD_decodingBufferSize_internal(unsigned long long windowSize, unsigned long long frameContentSize, size_t blockSizeMax)
|
|
{
|
|
size_t const blockSize = MIN((size_t)MIN(windowSize, ZSTD_BLOCKSIZE_MAX), blockSizeMax);
|
|
/* We need blockSize + WILDCOPY_OVERLENGTH worth of buffer so that if a block
|
|
* ends at windowSize + WILDCOPY_OVERLENGTH + 1 bytes, we can start writing
|
|
* the block at the beginning of the output buffer, and maintain a full window.
|
|
*
|
|
* We need another blockSize worth of buffer so that we can store split
|
|
* literals at the end of the block without overwriting the extDict window.
|
|
*/
|
|
unsigned long long const neededRBSize = windowSize + (blockSize * 2) + (WILDCOPY_OVERLENGTH * 2);
|
|
unsigned long long const neededSize = MIN(frameContentSize, neededRBSize);
|
|
size_t const minRBSize = (size_t) neededSize;
|
|
RETURN_ERROR_IF((unsigned long long)minRBSize != neededSize,
|
|
frameParameter_windowTooLarge, "");
|
|
return minRBSize;
|
|
}
|
|
|
|
size_t ZSTD_decodingBufferSize_min(unsigned long long windowSize, unsigned long long frameContentSize)
|
|
{
|
|
return ZSTD_decodingBufferSize_internal(windowSize, frameContentSize, ZSTD_BLOCKSIZE_MAX);
|
|
}
|
|
|
|
size_t ZSTD_estimateDStreamSize(size_t windowSize)
|
|
{
|
|
size_t const blockSize = MIN(windowSize, ZSTD_BLOCKSIZE_MAX);
|
|
size_t const inBuffSize = blockSize; /* no block can be larger */
|
|
size_t const outBuffSize = ZSTD_decodingBufferSize_min(windowSize, ZSTD_CONTENTSIZE_UNKNOWN);
|
|
return ZSTD_estimateDCtxSize() + inBuffSize + outBuffSize;
|
|
}
|
|
|
|
size_t ZSTD_estimateDStreamSize_fromFrame(const void* src, size_t srcSize)
|
|
{
|
|
U32 const windowSizeMax = 1U << ZSTD_WINDOWLOG_MAX; /* note : should be user-selectable, but requires an additional parameter (or a dctx) */
|
|
ZSTD_frameHeader zfh;
|
|
size_t const err = ZSTD_getFrameHeader(&zfh, src, srcSize);
|
|
if (ZSTD_isError(err)) return err;
|
|
RETURN_ERROR_IF(err>0, srcSize_wrong, "");
|
|
RETURN_ERROR_IF(zfh.windowSize > windowSizeMax,
|
|
frameParameter_windowTooLarge, "");
|
|
return ZSTD_estimateDStreamSize((size_t)zfh.windowSize);
|
|
}
|
|
|
|
|
|
/* ***** Decompression ***** */
|
|
|
|
static int ZSTD_DCtx_isOverflow(ZSTD_DStream* zds, size_t const neededInBuffSize, size_t const neededOutBuffSize)
|
|
{
|
|
return (zds->inBuffSize + zds->outBuffSize) >= (neededInBuffSize + neededOutBuffSize) * ZSTD_WORKSPACETOOLARGE_FACTOR;
|
|
}
|
|
|
|
static void ZSTD_DCtx_updateOversizedDuration(ZSTD_DStream* zds, size_t const neededInBuffSize, size_t const neededOutBuffSize)
|
|
{
|
|
if (ZSTD_DCtx_isOverflow(zds, neededInBuffSize, neededOutBuffSize))
|
|
zds->oversizedDuration++;
|
|
else
|
|
zds->oversizedDuration = 0;
|
|
}
|
|
|
|
static int ZSTD_DCtx_isOversizedTooLong(ZSTD_DStream* zds)
|
|
{
|
|
return zds->oversizedDuration >= ZSTD_WORKSPACETOOLARGE_MAXDURATION;
|
|
}
|
|
|
|
/* Checks that the output buffer hasn't changed if ZSTD_obm_stable is used. */
|
|
static size_t ZSTD_checkOutBuffer(ZSTD_DStream const* zds, ZSTD_outBuffer const* output)
|
|
{
|
|
ZSTD_outBuffer const expect = zds->expectedOutBuffer;
|
|
/* No requirement when ZSTD_obm_stable is not enabled. */
|
|
if (zds->outBufferMode != ZSTD_bm_stable)
|
|
return 0;
|
|
/* Any buffer is allowed in zdss_init, this must be the same for every other call until
|
|
* the context is reset.
|
|
*/
|
|
if (zds->streamStage == zdss_init)
|
|
return 0;
|
|
/* The buffer must match our expectation exactly. */
|
|
if (expect.dst == output->dst && expect.pos == output->pos && expect.size == output->size)
|
|
return 0;
|
|
RETURN_ERROR(dstBuffer_wrong, "ZSTD_d_stableOutBuffer enabled but output differs!");
|
|
}
|
|
|
|
/* Calls ZSTD_decompressContinue() with the right parameters for ZSTD_decompressStream()
|
|
* and updates the stage and the output buffer state. This call is extracted so it can be
|
|
* used both when reading directly from the ZSTD_inBuffer, and in buffered input mode.
|
|
* NOTE: You must break after calling this function since the streamStage is modified.
|
|
*/
|
|
static size_t ZSTD_decompressContinueStream(
|
|
ZSTD_DStream* zds, char** op, char* oend,
|
|
void const* src, size_t srcSize) {
|
|
int const isSkipFrame = ZSTD_isSkipFrame(zds);
|
|
if (zds->outBufferMode == ZSTD_bm_buffered) {
|
|
size_t const dstSize = isSkipFrame ? 0 : zds->outBuffSize - zds->outStart;
|
|
size_t const decodedSize = ZSTD_decompressContinue(zds,
|
|
zds->outBuff + zds->outStart, dstSize, src, srcSize);
|
|
FORWARD_IF_ERROR(decodedSize, "");
|
|
if (!decodedSize && !isSkipFrame) {
|
|
zds->streamStage = zdss_read;
|
|
} else {
|
|
zds->outEnd = zds->outStart + decodedSize;
|
|
zds->streamStage = zdss_flush;
|
|
}
|
|
} else {
|
|
/* Write directly into the output buffer */
|
|
size_t const dstSize = isSkipFrame ? 0 : (size_t)(oend - *op);
|
|
size_t const decodedSize = ZSTD_decompressContinue(zds, *op, dstSize, src, srcSize);
|
|
FORWARD_IF_ERROR(decodedSize, "");
|
|
*op += decodedSize;
|
|
/* Flushing is not needed. */
|
|
zds->streamStage = zdss_read;
|
|
assert(*op <= oend);
|
|
assert(zds->outBufferMode == ZSTD_bm_stable);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
size_t ZSTD_decompressStream(ZSTD_DStream* zds, ZSTD_outBuffer* output, ZSTD_inBuffer* input)
|
|
{
|
|
const char* const src = (const char*)input->src;
|
|
const char* const istart = input->pos != 0 ? src + input->pos : src;
|
|
const char* const iend = input->size != 0 ? src + input->size : src;
|
|
const char* ip = istart;
|
|
char* const dst = (char*)output->dst;
|
|
char* const ostart = output->pos != 0 ? dst + output->pos : dst;
|
|
char* const oend = output->size != 0 ? dst + output->size : dst;
|
|
char* op = ostart;
|
|
U32 someMoreWork = 1;
|
|
|
|
DEBUGLOG(5, "ZSTD_decompressStream");
|
|
RETURN_ERROR_IF(
|
|
input->pos > input->size,
|
|
srcSize_wrong,
|
|
"forbidden. in: pos: %u vs size: %u",
|
|
(U32)input->pos, (U32)input->size);
|
|
RETURN_ERROR_IF(
|
|
output->pos > output->size,
|
|
dstSize_tooSmall,
|
|
"forbidden. out: pos: %u vs size: %u",
|
|
(U32)output->pos, (U32)output->size);
|
|
DEBUGLOG(5, "input size : %u", (U32)(input->size - input->pos));
|
|
FORWARD_IF_ERROR(ZSTD_checkOutBuffer(zds, output), "");
|
|
|
|
while (someMoreWork) {
|
|
switch(zds->streamStage)
|
|
{
|
|
case zdss_init :
|
|
DEBUGLOG(5, "stage zdss_init => transparent reset ");
|
|
zds->streamStage = zdss_loadHeader;
|
|
zds->lhSize = zds->inPos = zds->outStart = zds->outEnd = 0;
|
|
#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT>=1)
|
|
zds->legacyVersion = 0;
|
|
#endif
|
|
zds->hostageByte = 0;
|
|
zds->expectedOutBuffer = *output;
|
|
ZSTD_FALLTHROUGH;
|
|
|
|
case zdss_loadHeader :
|
|
DEBUGLOG(5, "stage zdss_loadHeader (srcSize : %u)", (U32)(iend - ip));
|
|
#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT>=1)
|
|
if (zds->legacyVersion) {
|
|
RETURN_ERROR_IF(zds->staticSize, memory_allocation,
|
|
"legacy support is incompatible with static dctx");
|
|
{ size_t const hint = ZSTD_decompressLegacyStream(zds->legacyContext, zds->legacyVersion, output, input);
|
|
if (hint==0) zds->streamStage = zdss_init;
|
|
return hint;
|
|
} }
|
|
#endif
|
|
{ size_t const hSize = ZSTD_getFrameHeader_advanced(&zds->fParams, zds->headerBuffer, zds->lhSize, zds->format);
|
|
if (zds->refMultipleDDicts && zds->ddictSet) {
|
|
ZSTD_DCtx_selectFrameDDict(zds);
|
|
}
|
|
if (ZSTD_isError(hSize)) {
|
|
#if defined(ZSTD_LEGACY_SUPPORT) && (ZSTD_LEGACY_SUPPORT>=1)
|
|
U32 const legacyVersion = ZSTD_isLegacy(istart, iend-istart);
|
|
if (legacyVersion) {
|
|
ZSTD_DDict const* const ddict = ZSTD_getDDict(zds);
|
|
const void* const dict = ddict ? ZSTD_DDict_dictContent(ddict) : NULL;
|
|
size_t const dictSize = ddict ? ZSTD_DDict_dictSize(ddict) : 0;
|
|
DEBUGLOG(5, "ZSTD_decompressStream: detected legacy version v0.%u", legacyVersion);
|
|
RETURN_ERROR_IF(zds->staticSize, memory_allocation,
|
|
"legacy support is incompatible with static dctx");
|
|
FORWARD_IF_ERROR(ZSTD_initLegacyStream(&zds->legacyContext,
|
|
zds->previousLegacyVersion, legacyVersion,
|
|
dict, dictSize), "");
|
|
zds->legacyVersion = zds->previousLegacyVersion = legacyVersion;
|
|
{ size_t const hint = ZSTD_decompressLegacyStream(zds->legacyContext, legacyVersion, output, input);
|
|
if (hint==0) zds->streamStage = zdss_init; /* or stay in stage zdss_loadHeader */
|
|
return hint;
|
|
} }
|
|
#endif
|
|
return hSize; /* error */
|
|
}
|
|
if (hSize != 0) { /* need more input */
|
|
size_t const toLoad = hSize - zds->lhSize; /* if hSize!=0, hSize > zds->lhSize */
|
|
size_t const remainingInput = (size_t)(iend-ip);
|
|
assert(iend >= ip);
|
|
if (toLoad > remainingInput) { /* not enough input to load full header */
|
|
if (remainingInput > 0) {
|
|
ZSTD_memcpy(zds->headerBuffer + zds->lhSize, ip, remainingInput);
|
|
zds->lhSize += remainingInput;
|
|
}
|
|
input->pos = input->size;
|
|
/* check first few bytes */
|
|
FORWARD_IF_ERROR(
|
|
ZSTD_getFrameHeader_advanced(&zds->fParams, zds->headerBuffer, zds->lhSize, zds->format),
|
|
"First few bytes detected incorrect" );
|
|
/* return hint input size */
|
|
return (MAX((size_t)ZSTD_FRAMEHEADERSIZE_MIN(zds->format), hSize) - zds->lhSize) + ZSTD_blockHeaderSize; /* remaining header bytes + next block header */
|
|
}
|
|
assert(ip != NULL);
|
|
ZSTD_memcpy(zds->headerBuffer + zds->lhSize, ip, toLoad); zds->lhSize = hSize; ip += toLoad;
|
|
break;
|
|
} }
|
|
|
|
/* check for single-pass mode opportunity */
|
|
if (zds->fParams.frameContentSize != ZSTD_CONTENTSIZE_UNKNOWN
|
|
&& zds->fParams.frameType != ZSTD_skippableFrame
|
|
&& (U64)(size_t)(oend-op) >= zds->fParams.frameContentSize) {
|
|
size_t const cSize = ZSTD_findFrameCompressedSize_advanced(istart, (size_t)(iend-istart), zds->format);
|
|
if (cSize <= (size_t)(iend-istart)) {
|
|
/* shortcut : using single-pass mode */
|
|
size_t const decompressedSize = ZSTD_decompress_usingDDict(zds, op, (size_t)(oend-op), istart, cSize, ZSTD_getDDict(zds));
|
|
if (ZSTD_isError(decompressedSize)) return decompressedSize;
|
|
DEBUGLOG(4, "shortcut to single-pass ZSTD_decompress_usingDDict()");
|
|
assert(istart != NULL);
|
|
ip = istart + cSize;
|
|
op = op ? op + decompressedSize : op; /* can occur if frameContentSize = 0 (empty frame) */
|
|
zds->expected = 0;
|
|
zds->streamStage = zdss_init;
|
|
someMoreWork = 0;
|
|
break;
|
|
} }
|
|
|
|
/* Check output buffer is large enough for ZSTD_odm_stable. */
|
|
if (zds->outBufferMode == ZSTD_bm_stable
|
|
&& zds->fParams.frameType != ZSTD_skippableFrame
|
|
&& zds->fParams.frameContentSize != ZSTD_CONTENTSIZE_UNKNOWN
|
|
&& (U64)(size_t)(oend-op) < zds->fParams.frameContentSize) {
|
|
RETURN_ERROR(dstSize_tooSmall, "ZSTD_obm_stable passed but ZSTD_outBuffer is too small");
|
|
}
|
|
|
|
/* Consume header (see ZSTDds_decodeFrameHeader) */
|
|
DEBUGLOG(4, "Consume header");
|
|
FORWARD_IF_ERROR(ZSTD_decompressBegin_usingDDict(zds, ZSTD_getDDict(zds)), "");
|
|
|
|
if (zds->format == ZSTD_f_zstd1
|
|
&& (MEM_readLE32(zds->headerBuffer) & ZSTD_MAGIC_SKIPPABLE_MASK) == ZSTD_MAGIC_SKIPPABLE_START) { /* skippable frame */
|
|
zds->expected = MEM_readLE32(zds->headerBuffer + ZSTD_FRAMEIDSIZE);
|
|
zds->stage = ZSTDds_skipFrame;
|
|
} else {
|
|
FORWARD_IF_ERROR(ZSTD_decodeFrameHeader(zds, zds->headerBuffer, zds->lhSize), "");
|
|
zds->expected = ZSTD_blockHeaderSize;
|
|
zds->stage = ZSTDds_decodeBlockHeader;
|
|
}
|
|
|
|
/* control buffer memory usage */
|
|
DEBUGLOG(4, "Control max memory usage (%u KB <= max %u KB)",
|
|
(U32)(zds->fParams.windowSize >>10),
|
|
(U32)(zds->maxWindowSize >> 10) );
|
|
zds->fParams.windowSize = MAX(zds->fParams.windowSize, 1U << ZSTD_WINDOWLOG_ABSOLUTEMIN);
|
|
RETURN_ERROR_IF(zds->fParams.windowSize > zds->maxWindowSize,
|
|
frameParameter_windowTooLarge, "");
|
|
if (zds->maxBlockSizeParam != 0)
|
|
zds->fParams.blockSizeMax = MIN(zds->fParams.blockSizeMax, (unsigned)zds->maxBlockSizeParam);
|
|
|
|
/* Adapt buffer sizes to frame header instructions */
|
|
{ size_t const neededInBuffSize = MAX(zds->fParams.blockSizeMax, 4 /* frame checksum */);
|
|
size_t const neededOutBuffSize = zds->outBufferMode == ZSTD_bm_buffered
|
|
? ZSTD_decodingBufferSize_internal(zds->fParams.windowSize, zds->fParams.frameContentSize, zds->fParams.blockSizeMax)
|
|
: 0;
|
|
|
|
ZSTD_DCtx_updateOversizedDuration(zds, neededInBuffSize, neededOutBuffSize);
|
|
|
|
{ int const tooSmall = (zds->inBuffSize < neededInBuffSize) || (zds->outBuffSize < neededOutBuffSize);
|
|
int const tooLarge = ZSTD_DCtx_isOversizedTooLong(zds);
|
|
|
|
if (tooSmall || tooLarge) {
|
|
size_t const bufferSize = neededInBuffSize + neededOutBuffSize;
|
|
DEBUGLOG(4, "inBuff : from %u to %u",
|
|
(U32)zds->inBuffSize, (U32)neededInBuffSize);
|
|
DEBUGLOG(4, "outBuff : from %u to %u",
|
|
(U32)zds->outBuffSize, (U32)neededOutBuffSize);
|
|
if (zds->staticSize) { /* static DCtx */
|
|
DEBUGLOG(4, "staticSize : %u", (U32)zds->staticSize);
|
|
assert(zds->staticSize >= sizeof(ZSTD_DCtx)); /* controlled at init */
|
|
RETURN_ERROR_IF(
|
|
bufferSize > zds->staticSize - sizeof(ZSTD_DCtx),
|
|
memory_allocation, "");
|
|
} else {
|
|
ZSTD_customFree(zds->inBuff, zds->customMem);
|
|
zds->inBuffSize = 0;
|
|
zds->outBuffSize = 0;
|
|
zds->inBuff = (char*)ZSTD_customMalloc(bufferSize, zds->customMem);
|
|
RETURN_ERROR_IF(zds->inBuff == NULL, memory_allocation, "");
|
|
}
|
|
zds->inBuffSize = neededInBuffSize;
|
|
zds->outBuff = zds->inBuff + zds->inBuffSize;
|
|
zds->outBuffSize = neededOutBuffSize;
|
|
} } }
|
|
zds->streamStage = zdss_read;
|
|
ZSTD_FALLTHROUGH;
|
|
|
|
case zdss_read:
|
|
DEBUGLOG(5, "stage zdss_read");
|
|
{ size_t const neededInSize = ZSTD_nextSrcSizeToDecompressWithInputSize(zds, (size_t)(iend - ip));
|
|
DEBUGLOG(5, "neededInSize = %u", (U32)neededInSize);
|
|
if (neededInSize==0) { /* end of frame */
|
|
zds->streamStage = zdss_init;
|
|
someMoreWork = 0;
|
|
break;
|
|
}
|
|
if ((size_t)(iend-ip) >= neededInSize) { /* decode directly from src */
|
|
FORWARD_IF_ERROR(ZSTD_decompressContinueStream(zds, &op, oend, ip, neededInSize), "");
|
|
assert(ip != NULL);
|
|
ip += neededInSize;
|
|
/* Function modifies the stage so we must break */
|
|
break;
|
|
} }
|
|
if (ip==iend) { someMoreWork = 0; break; } /* no more input */
|
|
zds->streamStage = zdss_load;
|
|
ZSTD_FALLTHROUGH;
|
|
|
|
case zdss_load:
|
|
{ size_t const neededInSize = ZSTD_nextSrcSizeToDecompress(zds);
|
|
size_t const toLoad = neededInSize - zds->inPos;
|
|
int const isSkipFrame = ZSTD_isSkipFrame(zds);
|
|
size_t loadedSize;
|
|
/* At this point we shouldn't be decompressing a block that we can stream. */
|
|
assert(neededInSize == ZSTD_nextSrcSizeToDecompressWithInputSize(zds, (size_t)(iend - ip)));
|
|
if (isSkipFrame) {
|
|
loadedSize = MIN(toLoad, (size_t)(iend-ip));
|
|
} else {
|
|
RETURN_ERROR_IF(toLoad > zds->inBuffSize - zds->inPos,
|
|
corruption_detected,
|
|
"should never happen");
|
|
loadedSize = ZSTD_limitCopy(zds->inBuff + zds->inPos, toLoad, ip, (size_t)(iend-ip));
|
|
}
|
|
if (loadedSize != 0) {
|
|
/* ip may be NULL */
|
|
ip += loadedSize;
|
|
zds->inPos += loadedSize;
|
|
}
|
|
if (loadedSize < toLoad) { someMoreWork = 0; break; } /* not enough input, wait for more */
|
|
|
|
/* decode loaded input */
|
|
zds->inPos = 0; /* input is consumed */
|
|
FORWARD_IF_ERROR(ZSTD_decompressContinueStream(zds, &op, oend, zds->inBuff, neededInSize), "");
|
|
/* Function modifies the stage so we must break */
|
|
break;
|
|
}
|
|
case zdss_flush:
|
|
{
|
|
size_t const toFlushSize = zds->outEnd - zds->outStart;
|
|
size_t const flushedSize = ZSTD_limitCopy(op, (size_t)(oend-op), zds->outBuff + zds->outStart, toFlushSize);
|
|
|
|
op = op ? op + flushedSize : op;
|
|
|
|
zds->outStart += flushedSize;
|
|
if (flushedSize == toFlushSize) { /* flush completed */
|
|
zds->streamStage = zdss_read;
|
|
if ( (zds->outBuffSize < zds->fParams.frameContentSize)
|
|
&& (zds->outStart + zds->fParams.blockSizeMax > zds->outBuffSize) ) {
|
|
DEBUGLOG(5, "restart filling outBuff from beginning (left:%i, needed:%u)",
|
|
(int)(zds->outBuffSize - zds->outStart),
|
|
(U32)zds->fParams.blockSizeMax);
|
|
zds->outStart = zds->outEnd = 0;
|
|
}
|
|
break;
|
|
} }
|
|
/* cannot complete flush */
|
|
someMoreWork = 0;
|
|
break;
|
|
|
|
default:
|
|
assert(0); /* impossible */
|
|
RETURN_ERROR(GENERIC, "impossible to reach"); /* some compilers require default to do something */
|
|
} }
|
|
|
|
/* result */
|
|
input->pos = (size_t)(ip - (const char*)(input->src));
|
|
output->pos = (size_t)(op - (char*)(output->dst));
|
|
|
|
/* Update the expected output buffer for ZSTD_obm_stable. */
|
|
zds->expectedOutBuffer = *output;
|
|
|
|
if ((ip==istart) && (op==ostart)) { /* no forward progress */
|
|
zds->noForwardProgress ++;
|
|
if (zds->noForwardProgress >= ZSTD_NO_FORWARD_PROGRESS_MAX) {
|
|
RETURN_ERROR_IF(op==oend, noForwardProgress_destFull, "");
|
|
RETURN_ERROR_IF(ip==iend, noForwardProgress_inputEmpty, "");
|
|
assert(0);
|
|
}
|
|
} else {
|
|
zds->noForwardProgress = 0;
|
|
}
|
|
{ size_t nextSrcSizeHint = ZSTD_nextSrcSizeToDecompress(zds);
|
|
if (!nextSrcSizeHint) { /* frame fully decoded */
|
|
if (zds->outEnd == zds->outStart) { /* output fully flushed */
|
|
if (zds->hostageByte) {
|
|
if (input->pos >= input->size) {
|
|
/* can't release hostage (not present) */
|
|
zds->streamStage = zdss_read;
|
|
return 1;
|
|
}
|
|
input->pos++; /* release hostage */
|
|
} /* zds->hostageByte */
|
|
return 0;
|
|
} /* zds->outEnd == zds->outStart */
|
|
if (!zds->hostageByte) { /* output not fully flushed; keep last byte as hostage; will be released when all output is flushed */
|
|
input->pos--; /* note : pos > 0, otherwise, impossible to finish reading last block */
|
|
zds->hostageByte=1;
|
|
}
|
|
return 1;
|
|
} /* nextSrcSizeHint==0 */
|
|
nextSrcSizeHint += ZSTD_blockHeaderSize * (ZSTD_nextInputType(zds) == ZSTDnit_block); /* preload header of next block */
|
|
assert(zds->inPos <= nextSrcSizeHint);
|
|
nextSrcSizeHint -= zds->inPos; /* part already loaded*/
|
|
return nextSrcSizeHint;
|
|
}
|
|
}
|
|
|
|
size_t ZSTD_decompressStream_simpleArgs (
|
|
ZSTD_DCtx* dctx,
|
|
void* dst, size_t dstCapacity, size_t* dstPos,
|
|
const void* src, size_t srcSize, size_t* srcPos)
|
|
{
|
|
ZSTD_outBuffer output;
|
|
ZSTD_inBuffer input;
|
|
output.dst = dst;
|
|
output.size = dstCapacity;
|
|
output.pos = *dstPos;
|
|
input.src = src;
|
|
input.size = srcSize;
|
|
input.pos = *srcPos;
|
|
{ size_t const cErr = ZSTD_decompressStream(dctx, &output, &input);
|
|
*dstPos = output.pos;
|
|
*srcPos = input.pos;
|
|
return cErr;
|
|
}
|
|
}
|