400 lines
10 KiB
C++
400 lines
10 KiB
C++
/*************************************************************************/
|
|
/* file_access_compressed.cpp */
|
|
/*************************************************************************/
|
|
/* This file is part of: */
|
|
/* GODOT ENGINE */
|
|
/* https://godotengine.org */
|
|
/*************************************************************************/
|
|
/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */
|
|
/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md) */
|
|
/* */
|
|
/* Permission is hereby granted, free of charge, to any person obtaining */
|
|
/* a copy of this software and associated documentation files (the */
|
|
/* "Software"), to deal in the Software without restriction, including */
|
|
/* without limitation the rights to use, copy, modify, merge, publish, */
|
|
/* distribute, sublicense, and/or sell copies of the Software, and to */
|
|
/* permit persons to whom the Software is furnished to do so, subject to */
|
|
/* the following conditions: */
|
|
/* */
|
|
/* The above copyright notice and this permission notice shall be */
|
|
/* included in all copies or substantial portions of the Software. */
|
|
/* */
|
|
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
|
|
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
|
|
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
|
|
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
|
|
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
|
|
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
|
|
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
|
|
/*************************************************************************/
|
|
|
|
#include "file_access_compressed.h"
|
|
|
|
#include "core/print_string.h"
|
|
|
|
void FileAccessCompressed::configure(const String &p_magic, Compression::Mode p_mode, int p_block_size) {
|
|
|
|
magic = p_magic.ascii().get_data();
|
|
if (magic.length() > 4)
|
|
magic = magic.substr(0, 4);
|
|
else {
|
|
while (magic.length() < 4)
|
|
magic += " ";
|
|
}
|
|
|
|
cmode = p_mode;
|
|
block_size = p_block_size;
|
|
}
|
|
|
|
#define WRITE_FIT(m_bytes) \
|
|
{ \
|
|
if (write_pos + (m_bytes) > write_max) { \
|
|
write_max = write_pos + (m_bytes); \
|
|
} \
|
|
if (write_max > write_buffer_size) { \
|
|
write_buffer_size = next_power_of_2(write_max); \
|
|
buffer.resize(write_buffer_size); \
|
|
write_ptr = buffer.ptrw(); \
|
|
} \
|
|
}
|
|
|
|
Error FileAccessCompressed::open_after_magic(FileAccess *p_base) {
|
|
|
|
f = p_base;
|
|
cmode = (Compression::Mode)f->get_32();
|
|
block_size = f->get_32();
|
|
read_total = f->get_32();
|
|
int bc = (read_total / block_size) + 1;
|
|
int acc_ofs = f->get_position() + bc * 4;
|
|
int max_bs = 0;
|
|
for (int i = 0; i < bc; i++) {
|
|
|
|
ReadBlock rb;
|
|
rb.offset = acc_ofs;
|
|
rb.csize = f->get_32();
|
|
acc_ofs += rb.csize;
|
|
max_bs = MAX(max_bs, rb.csize);
|
|
read_blocks.push_back(rb);
|
|
}
|
|
|
|
comp_buffer.resize(max_bs);
|
|
buffer.resize(block_size);
|
|
read_ptr = buffer.ptrw();
|
|
f->get_buffer(comp_buffer.ptrw(), read_blocks[0].csize);
|
|
at_end = false;
|
|
read_eof = false;
|
|
read_block_count = bc;
|
|
read_block_size = read_blocks.size() == 1 ? read_total : block_size;
|
|
|
|
Compression::decompress(buffer.ptrw(), read_block_size, comp_buffer.ptr(), read_blocks[0].csize, cmode);
|
|
read_block = 0;
|
|
read_pos = 0;
|
|
|
|
return OK;
|
|
}
|
|
|
|
Error FileAccessCompressed::_open(const String &p_path, int p_mode_flags) {
|
|
|
|
ERR_FAIL_COND_V(p_mode_flags == READ_WRITE, ERR_UNAVAILABLE);
|
|
|
|
if (f)
|
|
close();
|
|
|
|
Error err;
|
|
f = FileAccess::open(p_path, p_mode_flags, &err);
|
|
if (err != OK) {
|
|
//not openable
|
|
|
|
f = NULL;
|
|
return err;
|
|
}
|
|
|
|
if (p_mode_flags & WRITE) {
|
|
|
|
buffer.clear();
|
|
writing = true;
|
|
write_pos = 0;
|
|
write_buffer_size = 256;
|
|
buffer.resize(256);
|
|
write_max = 0;
|
|
write_ptr = buffer.ptrw();
|
|
|
|
//don't store anything else unless it's done saving!
|
|
} else {
|
|
|
|
char rmagic[5];
|
|
f->get_buffer((uint8_t *)rmagic, 4);
|
|
rmagic[4] = 0;
|
|
if (magic != rmagic) {
|
|
memdelete(f);
|
|
f = NULL;
|
|
return ERR_FILE_UNRECOGNIZED;
|
|
}
|
|
|
|
open_after_magic(f);
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
void FileAccessCompressed::close() {
|
|
|
|
if (!f)
|
|
return;
|
|
|
|
if (writing) {
|
|
//save block table and all compressed blocks
|
|
|
|
CharString mgc = magic.utf8();
|
|
f->store_buffer((const uint8_t *)mgc.get_data(), mgc.length()); //write header 4
|
|
f->store_32(cmode); //write compression mode 4
|
|
f->store_32(block_size); //write block size 4
|
|
f->store_32(write_max); //max amount of data written 4
|
|
int bc = (write_max / block_size) + 1;
|
|
|
|
for (int i = 0; i < bc; i++) {
|
|
f->store_32(0); //compressed sizes, will update later
|
|
}
|
|
|
|
Vector<int> block_sizes;
|
|
for (int i = 0; i < bc; i++) {
|
|
|
|
int bl = i == (bc - 1) ? write_max % block_size : block_size;
|
|
uint8_t *bp = &write_ptr[i * block_size];
|
|
|
|
Vector<uint8_t> cblock;
|
|
cblock.resize(Compression::get_max_compressed_buffer_size(bl, cmode));
|
|
int s = Compression::compress(cblock.ptrw(), bp, bl, cmode);
|
|
|
|
f->store_buffer(cblock.ptr(), s);
|
|
block_sizes.push_back(s);
|
|
}
|
|
|
|
f->seek(16); //ok write block sizes
|
|
for (int i = 0; i < bc; i++)
|
|
f->store_32(block_sizes[i]);
|
|
f->seek_end();
|
|
f->store_buffer((const uint8_t *)mgc.get_data(), mgc.length()); //magic at the end too
|
|
|
|
buffer.clear();
|
|
|
|
} else {
|
|
|
|
comp_buffer.clear();
|
|
buffer.clear();
|
|
read_blocks.clear();
|
|
}
|
|
|
|
memdelete(f);
|
|
f = NULL;
|
|
}
|
|
|
|
bool FileAccessCompressed::is_open() const {
|
|
|
|
return f != NULL;
|
|
}
|
|
|
|
void FileAccessCompressed::seek(size_t p_position) {
|
|
|
|
ERR_FAIL_COND(!f);
|
|
if (writing) {
|
|
|
|
ERR_FAIL_COND(p_position > write_max);
|
|
|
|
write_pos = p_position;
|
|
|
|
} else {
|
|
|
|
ERR_FAIL_COND(p_position > read_total);
|
|
if (p_position == read_total) {
|
|
at_end = true;
|
|
} else {
|
|
|
|
int block_idx = p_position / block_size;
|
|
if (block_idx != read_block) {
|
|
|
|
read_block = block_idx;
|
|
f->seek(read_blocks[read_block].offset);
|
|
f->get_buffer(comp_buffer.ptrw(), read_blocks[read_block].csize);
|
|
Compression::decompress(buffer.ptrw(), read_blocks.size() == 1 ? read_total : block_size, comp_buffer.ptr(), read_blocks[read_block].csize, cmode);
|
|
read_block_size = read_block == read_block_count - 1 ? read_total % block_size : block_size;
|
|
}
|
|
|
|
read_pos = p_position % block_size;
|
|
}
|
|
}
|
|
}
|
|
|
|
void FileAccessCompressed::seek_end(int64_t p_position) {
|
|
|
|
ERR_FAIL_COND(!f);
|
|
if (writing) {
|
|
|
|
seek(write_max + p_position);
|
|
} else {
|
|
|
|
seek(read_total + p_position);
|
|
}
|
|
}
|
|
size_t FileAccessCompressed::get_position() const {
|
|
|
|
ERR_FAIL_COND_V(!f, 0);
|
|
if (writing) {
|
|
|
|
return write_pos;
|
|
} else {
|
|
|
|
return read_block * block_size + read_pos;
|
|
}
|
|
}
|
|
size_t FileAccessCompressed::get_len() const {
|
|
|
|
ERR_FAIL_COND_V(!f, 0);
|
|
if (writing) {
|
|
|
|
return write_max;
|
|
} else {
|
|
return read_total;
|
|
}
|
|
}
|
|
|
|
bool FileAccessCompressed::eof_reached() const {
|
|
|
|
ERR_FAIL_COND_V(!f, false);
|
|
if (writing) {
|
|
return false;
|
|
} else {
|
|
return read_eof;
|
|
}
|
|
}
|
|
|
|
uint8_t FileAccessCompressed::get_8() const {
|
|
|
|
ERR_FAIL_COND_V(writing, 0);
|
|
ERR_FAIL_COND_V(!f, 0);
|
|
|
|
if (at_end) {
|
|
read_eof = true;
|
|
return 0;
|
|
}
|
|
|
|
uint8_t ret = read_ptr[read_pos];
|
|
|
|
read_pos++;
|
|
if (read_pos >= read_block_size) {
|
|
read_block++;
|
|
|
|
if (read_block < read_block_count) {
|
|
//read another block of compressed data
|
|
f->get_buffer(comp_buffer.ptrw(), read_blocks[read_block].csize);
|
|
Compression::decompress(buffer.ptrw(), read_blocks.size() == 1 ? read_total : block_size, comp_buffer.ptr(), read_blocks[read_block].csize, cmode);
|
|
read_block_size = read_block == read_block_count - 1 ? read_total % block_size : block_size;
|
|
read_pos = 0;
|
|
|
|
} else {
|
|
read_block--;
|
|
at_end = true;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
int FileAccessCompressed::get_buffer(uint8_t *p_dst, int p_length) const {
|
|
|
|
ERR_FAIL_COND_V(writing, 0);
|
|
ERR_FAIL_COND_V(!f, 0);
|
|
|
|
if (at_end) {
|
|
read_eof = true;
|
|
return 0;
|
|
}
|
|
|
|
for (int i = 0; i < p_length; i++) {
|
|
|
|
p_dst[i] = read_ptr[read_pos];
|
|
read_pos++;
|
|
if (read_pos >= read_block_size) {
|
|
read_block++;
|
|
|
|
if (read_block < read_block_count) {
|
|
//read another block of compressed data
|
|
f->get_buffer(comp_buffer.ptrw(), read_blocks[read_block].csize);
|
|
Compression::decompress(buffer.ptrw(), read_blocks.size() == 1 ? read_total : block_size, comp_buffer.ptr(), read_blocks[read_block].csize, cmode);
|
|
read_block_size = read_block == read_block_count - 1 ? read_total % block_size : block_size;
|
|
read_pos = 0;
|
|
|
|
} else {
|
|
read_block--;
|
|
at_end = true;
|
|
if (i < p_length - 1)
|
|
read_eof = true;
|
|
return i;
|
|
}
|
|
}
|
|
}
|
|
|
|
return p_length;
|
|
}
|
|
|
|
Error FileAccessCompressed::get_error() const {
|
|
|
|
return read_eof ? ERR_FILE_EOF : OK;
|
|
}
|
|
|
|
void FileAccessCompressed::flush() {
|
|
ERR_FAIL_COND(!f);
|
|
ERR_FAIL_COND(!writing);
|
|
|
|
// compressed files keep data in memory till close()
|
|
}
|
|
|
|
void FileAccessCompressed::store_8(uint8_t p_dest) {
|
|
|
|
ERR_FAIL_COND(!f);
|
|
ERR_FAIL_COND(!writing);
|
|
|
|
WRITE_FIT(1);
|
|
write_ptr[write_pos++] = p_dest;
|
|
}
|
|
|
|
bool FileAccessCompressed::file_exists(const String &p_name) {
|
|
|
|
FileAccess *fa = FileAccess::open(p_name, FileAccess::READ);
|
|
if (!fa)
|
|
return false;
|
|
memdelete(fa);
|
|
return true;
|
|
}
|
|
|
|
uint64_t FileAccessCompressed::_get_modified_time(const String &p_file) {
|
|
|
|
if (f)
|
|
return f->get_modified_time(p_file);
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
FileAccessCompressed::FileAccessCompressed() :
|
|
cmode(Compression::MODE_ZSTD),
|
|
writing(false),
|
|
write_ptr(0),
|
|
write_buffer_size(0),
|
|
write_max(0),
|
|
block_size(0),
|
|
read_eof(false),
|
|
at_end(false),
|
|
read_ptr(NULL),
|
|
read_block(0),
|
|
read_block_count(0),
|
|
read_block_size(0),
|
|
read_pos(0),
|
|
read_total(0),
|
|
magic("GCMP"),
|
|
f(NULL) {
|
|
}
|
|
|
|
FileAccessCompressed::~FileAccessCompressed() {
|
|
|
|
if (f)
|
|
close();
|
|
}
|