1492 lines
54 KiB
C++
1492 lines
54 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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**********************************************************************
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* Copyright (C) 2002-2016, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* file name: ucnv_u7.c
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* encoding: UTF-8
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2002jul01
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* created by: Markus W. Scherer
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*
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* UTF-7 converter implementation. Used to be in ucnv_utf.c.
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*/
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_CONVERSION && !UCONFIG_ONLY_HTML_CONVERSION
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#include "cmemory.h"
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#include "unicode/ucnv.h"
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#include "ucnv_bld.h"
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#include "ucnv_cnv.h"
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#include "uassert.h"
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/* UTF-7 -------------------------------------------------------------------- */
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/*
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* UTF-7 is a stateful encoding of Unicode.
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* It is defined in RFC 2152. (http://www.ietf.org/rfc/rfc2152.txt)
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* It was intended for use in Internet email systems, using in its bytewise
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* encoding only a subset of 7-bit US-ASCII.
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* UTF-7 is deprecated in favor of UTF-8/16/32 and SCSU, but still
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* occasionally used.
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*
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* For converting Unicode to UTF-7, the RFC allows to encode some US-ASCII
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* characters directly or in base64. Especially, the characters in set O
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* as defined in the RFC (see below) may be encoded directly but are not
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* allowed in, e.g., email headers.
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* By default, the ICU UTF-7 converter encodes set O directly.
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* By choosing the option "version=1", set O will be escaped instead.
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* For example:
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* utf7Converter=ucnv_open("UTF-7,version=1");
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*
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* For details about email headers see RFC 2047.
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*/
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/*
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* Tests for US-ASCII characters belonging to character classes
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* defined in UTF-7.
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*
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* Set D (directly encoded characters) consists of the following
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* characters: the upper and lower case letters A through Z
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* and a through z, the 10 digits 0-9, and the following nine special
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* characters (note that "+" and "=" are omitted):
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* '(),-./:?
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*
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* Set O (optional direct characters) consists of the following
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* characters (note that "\" and "~" are omitted):
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* !"#$%&*;<=>@[]^_`{|}
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*
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* According to the rules in RFC 2152, the byte values for the following
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* US-ASCII characters are not used in UTF-7 and are therefore illegal:
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* - all C0 control codes except for CR LF TAB
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* - BACKSLASH
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* - TILDE
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* - DEL
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* - all codes beyond US-ASCII, i.e. all >127
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*/
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#define inSetD(c) \
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((uint8_t)((c)-97)<26 || (uint8_t)((c)-65)<26 || /* letters */ \
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(uint8_t)((c)-48)<10 || /* digits */ \
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(uint8_t)((c)-39)<3 || /* '() */ \
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(uint8_t)((c)-44)<4 || /* ,-./ */ \
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(c)==58 || (c)==63 /* :? */ \
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)
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#define inSetO(c) \
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((uint8_t)((c)-33)<6 || /* !"#$%& */ \
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(uint8_t)((c)-59)<4 || /* ;<=> */ \
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(uint8_t)((c)-93)<4 || /* ]^_` */ \
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(uint8_t)((c)-123)<3 || /* {|} */ \
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(c)==42 || (c)==64 || (c)==91 /* *@[ */ \
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)
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#define isCRLFTAB(c) ((c)==13 || (c)==10 || (c)==9)
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#define isCRLFSPTAB(c) ((c)==32 || (c)==13 || (c)==10 || (c)==9)
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#define PLUS 43
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#define MINUS 45
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#define BACKSLASH 92
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#define TILDE 126
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/* legal byte values: all US-ASCII graphic characters from space to before tilde, and CR LF TAB */
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#define isLegalUTF7(c) (((uint8_t)((c)-32)<94 && (c)!=BACKSLASH) || isCRLFTAB(c))
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/* encode directly sets D and O and CR LF SP TAB */
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static const UBool encodeDirectlyMaximum[128]={
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/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0
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};
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/* encode directly set D and CR LF SP TAB but not set O */
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static const UBool encodeDirectlyRestricted[128]={
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/* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1,
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0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
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0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0
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};
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static const uint8_t
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toBase64[64]={
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/* A-Z */
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65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77,
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78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90,
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/* a-z */
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97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109,
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110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122,
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/* 0-9 */
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48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
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/* +/ */
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43, 47
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};
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static const int8_t
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fromBase64[128]={
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/* C0 controls, -1 for legal ones (CR LF TAB), -3 for illegal ones */
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-3, -3, -3, -3, -3, -3, -3, -3, -3, -1, -1, -3, -3, -1, -3, -3,
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-3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3,
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/* general punctuation with + and / and a special value (-2) for - */
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -2, -1, 63,
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/* digits */
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
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/* A-Z */
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-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
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15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -3, -1, -1, -1,
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/* a-z */
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-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
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41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -3, -3
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};
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/*
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* converter status values:
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*
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* toUnicodeStatus:
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* 24 inDirectMode (boolean)
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* 23..16 base64Counter (-1..7)
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* 15..0 bits (up to 14 bits incoming base64)
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*
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* fromUnicodeStatus:
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* 31..28 version (0: set O direct 1: set O escaped)
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* 24 inDirectMode (boolean)
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* 23..16 base64Counter (0..2)
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* 7..0 bits (6 bits outgoing base64)
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*
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*/
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U_CDECL_BEGIN
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static void U_CALLCONV
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_UTF7Reset(UConverter *cnv, UConverterResetChoice choice) {
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if(choice<=UCNV_RESET_TO_UNICODE) {
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/* reset toUnicode */
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cnv->toUnicodeStatus=0x1000000; /* inDirectMode=true */
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cnv->toULength=0;
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}
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if(choice!=UCNV_RESET_TO_UNICODE) {
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/* reset fromUnicode */
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cnv->fromUnicodeStatus=(cnv->fromUnicodeStatus&0xf0000000)|0x1000000; /* keep version, inDirectMode=true */
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}
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}
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static void U_CALLCONV
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_UTF7Open(UConverter *cnv,
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UConverterLoadArgs *pArgs,
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UErrorCode *pErrorCode) {
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(void)pArgs;
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if(UCNV_GET_VERSION(cnv)<=1) {
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/* TODO(markus): Should just use cnv->options rather than copying the version number. */
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cnv->fromUnicodeStatus=UCNV_GET_VERSION(cnv)<<28;
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_UTF7Reset(cnv, UCNV_RESET_BOTH);
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} else {
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*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
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}
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}
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static void U_CALLCONV
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_UTF7ToUnicodeWithOffsets(UConverterToUnicodeArgs *pArgs,
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UErrorCode *pErrorCode) {
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UConverter *cnv;
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const uint8_t *source, *sourceLimit;
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UChar *target;
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const UChar *targetLimit;
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int32_t *offsets;
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uint8_t *bytes;
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uint8_t byteIndex;
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int32_t length, targetCapacity;
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/* UTF-7 state */
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uint16_t bits;
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int8_t base64Counter;
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UBool inDirectMode;
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int8_t base64Value;
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int32_t sourceIndex, nextSourceIndex;
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uint8_t b;
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/* set up the local pointers */
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cnv=pArgs->converter;
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source=(const uint8_t *)pArgs->source;
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sourceLimit=(const uint8_t *)pArgs->sourceLimit;
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target=pArgs->target;
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targetLimit=pArgs->targetLimit;
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offsets=pArgs->offsets;
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/* get the state machine state */
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{
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uint32_t status=cnv->toUnicodeStatus;
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inDirectMode=(UBool)((status>>24)&1);
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base64Counter=(int8_t)(status>>16);
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bits=(uint16_t)status;
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}
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bytes=cnv->toUBytes;
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byteIndex=cnv->toULength;
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/* sourceIndex=-1 if the current character began in the previous buffer */
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sourceIndex=byteIndex==0 ? 0 : -1;
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nextSourceIndex=0;
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if(inDirectMode) {
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directMode:
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/*
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* In Direct Mode, most US-ASCII characters are encoded directly, i.e.,
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* with their US-ASCII byte values.
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* Backslash and Tilde and most control characters are not allowed in UTF-7.
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* A plus sign starts Unicode (or "escape") Mode.
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*
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* In Direct Mode, only the sourceIndex is used.
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*/
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byteIndex=0;
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length=(int32_t)(sourceLimit-source);
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targetCapacity=(int32_t)(targetLimit-target);
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if(length>targetCapacity) {
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length=targetCapacity;
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}
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while(length>0) {
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b=*source++;
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if(!isLegalUTF7(b)) {
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/* illegal */
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bytes[0]=b;
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byteIndex=1;
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*pErrorCode=U_ILLEGAL_CHAR_FOUND;
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break;
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} else if(b!=PLUS) {
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/* write directly encoded character */
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*target++=b;
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if(offsets!=NULL) {
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*offsets++=sourceIndex++;
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}
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} else /* PLUS */ {
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/* switch to Unicode mode */
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nextSourceIndex=++sourceIndex;
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inDirectMode=false;
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byteIndex=0;
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bits=0;
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base64Counter=-1;
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goto unicodeMode;
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}
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--length;
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}
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if(source<sourceLimit && target>=targetLimit) {
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/* target is full */
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*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
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}
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} else {
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unicodeMode:
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/*
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* In Unicode (or "escape") Mode, UTF-16BE is base64-encoded.
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* The base64 sequence ends with any character that is not in the base64 alphabet.
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* A terminating minus sign is consumed.
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*
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* In Unicode Mode, the sourceIndex has the index to the start of the current
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* base64 bytes, while nextSourceIndex is precisely parallel to source,
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* keeping the index to the following byte.
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* Note that in 2 out of 3 cases, UChars overlap within a base64 byte.
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*/
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while(source<sourceLimit) {
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if(target<targetLimit) {
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bytes[byteIndex++]=b=*source++;
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++nextSourceIndex;
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base64Value = -3; /* initialize as illegal */
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if(b>=126 || (base64Value=fromBase64[b])==-3 || base64Value==-1) {
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/* either
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* base64Value==-1 for any legal character except base64 and minus sign, or
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* base64Value==-3 for illegal characters:
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* 1. In either case, leave Unicode mode.
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* 2.1. If we ended with an incomplete UChar or none after the +, then
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* generate an error for the preceding erroneous sequence and deal with
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* the current (possibly illegal) character next time through.
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* 2.2. Else the current char comes after a complete UChar, which was already
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* pushed to the output buf, so:
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* 2.2.1. If the current char is legal, just save it for processing next time.
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* It may be for example, a plus which we need to deal with in direct mode.
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* 2.2.2. Else if the current char is illegal, we might as well deal with it here.
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*/
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inDirectMode=true;
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if(base64Counter==-1) {
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/* illegal: + immediately followed by something other than base64 or minus sign */
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/* include the plus sign in the reported sequence, but not the subsequent char */
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--source;
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bytes[0]=PLUS;
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byteIndex=1;
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*pErrorCode=U_ILLEGAL_CHAR_FOUND;
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break;
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} else if(bits!=0) {
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/* bits are illegally left over, a UChar is incomplete */
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/* don't include current char (legal or illegal) in error seq */
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--source;
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--byteIndex;
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*pErrorCode=U_ILLEGAL_CHAR_FOUND;
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break;
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} else {
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/* previous UChar was complete */
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if(base64Value==-3) {
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/* current character is illegal, deal with it here */
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*pErrorCode=U_ILLEGAL_CHAR_FOUND;
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break;
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} else {
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/* un-read the current character in case it is a plus sign */
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--source;
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sourceIndex=nextSourceIndex-1;
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goto directMode;
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}
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}
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} else if(base64Value>=0) {
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/* collect base64 bytes into UChars */
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switch(base64Counter) {
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case -1: /* -1 is immediately after the + */
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case 0:
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bits=base64Value;
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base64Counter=1;
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break;
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case 1:
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case 3:
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case 4:
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case 6:
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bits=(uint16_t)((bits<<6)|base64Value);
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++base64Counter;
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break;
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case 2:
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*target++=(UChar)((bits<<4)|(base64Value>>2));
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if(offsets!=NULL) {
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*offsets++=sourceIndex;
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sourceIndex=nextSourceIndex-1;
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}
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bytes[0]=b; /* keep this byte in case an error occurs */
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byteIndex=1;
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bits=(uint16_t)(base64Value&3);
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base64Counter=3;
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break;
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case 5:
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*target++=(UChar)((bits<<2)|(base64Value>>4));
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if(offsets!=NULL) {
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*offsets++=sourceIndex;
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sourceIndex=nextSourceIndex-1;
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}
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bytes[0]=b; /* keep this byte in case an error occurs */
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byteIndex=1;
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bits=(uint16_t)(base64Value&15);
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base64Counter=6;
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break;
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case 7:
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*target++=(UChar)((bits<<6)|base64Value);
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if(offsets!=NULL) {
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*offsets++=sourceIndex;
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sourceIndex=nextSourceIndex;
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}
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byteIndex=0;
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bits=0;
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base64Counter=0;
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break;
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default:
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/* will never occur */
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break;
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}
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} else /*base64Value==-2*/ {
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/* minus sign terminates the base64 sequence */
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inDirectMode=true;
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if(base64Counter==-1) {
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/* +- i.e. a minus immediately following a plus */
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*target++=PLUS;
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if(offsets!=NULL) {
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*offsets++=sourceIndex-1;
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}
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} else {
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/* absorb the minus and leave the Unicode Mode */
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if(bits!=0) {
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/* bits are illegally left over, a UChar is incomplete */
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*pErrorCode=U_ILLEGAL_CHAR_FOUND;
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break;
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}
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}
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sourceIndex=nextSourceIndex;
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goto directMode;
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}
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} else {
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/* target is full */
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*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
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break;
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}
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}
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}
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if(U_SUCCESS(*pErrorCode) && pArgs->flush && source==sourceLimit && bits==0) {
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/*
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* if we are in Unicode mode, then the byteIndex might not be 0,
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* but that is ok if bits==0
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* -> we set byteIndex=0 at the end of the stream to avoid a truncated error
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* (not true for IMAP-mailbox-name where we must end in direct mode)
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*/
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byteIndex=0;
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}
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/* set the converter state back into UConverter */
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cnv->toUnicodeStatus=((uint32_t)inDirectMode<<24)|((uint32_t)((uint8_t)base64Counter)<<16)|(uint32_t)bits;
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cnv->toULength=byteIndex;
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|
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/* write back the updated pointers */
|
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pArgs->source=(const char *)source;
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pArgs->target=target;
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pArgs->offsets=offsets;
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return;
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}
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|
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static void U_CALLCONV
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_UTF7FromUnicodeWithOffsets(UConverterFromUnicodeArgs *pArgs,
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UErrorCode *pErrorCode) {
|
|
UConverter *cnv;
|
|
const UChar *source, *sourceLimit;
|
|
uint8_t *target, *targetLimit;
|
|
int32_t *offsets;
|
|
|
|
int32_t length, targetCapacity, sourceIndex;
|
|
UChar c;
|
|
|
|
/* UTF-7 state */
|
|
const UBool *encodeDirectly;
|
|
uint8_t bits;
|
|
int8_t base64Counter;
|
|
UBool inDirectMode;
|
|
|
|
/* set up the local pointers */
|
|
cnv=pArgs->converter;
|
|
|
|
/* set up the local pointers */
|
|
source=pArgs->source;
|
|
sourceLimit=pArgs->sourceLimit;
|
|
target=(uint8_t *)pArgs->target;
|
|
targetLimit=(uint8_t *)pArgs->targetLimit;
|
|
offsets=pArgs->offsets;
|
|
|
|
/* get the state machine state */
|
|
{
|
|
uint32_t status=cnv->fromUnicodeStatus;
|
|
encodeDirectly= status<0x10000000 ? encodeDirectlyMaximum : encodeDirectlyRestricted;
|
|
inDirectMode=(UBool)((status>>24)&1);
|
|
base64Counter=(int8_t)(status>>16);
|
|
bits=(uint8_t)status;
|
|
U_ASSERT(bits<=UPRV_LENGTHOF(toBase64));
|
|
}
|
|
|
|
/* UTF-7 always encodes UTF-16 code units, therefore we need only a simple sourceIndex */
|
|
sourceIndex=0;
|
|
|
|
if(inDirectMode) {
|
|
directMode:
|
|
length=(int32_t)(sourceLimit-source);
|
|
targetCapacity=(int32_t)(targetLimit-target);
|
|
if(length>targetCapacity) {
|
|
length=targetCapacity;
|
|
}
|
|
while(length>0) {
|
|
c=*source++;
|
|
/* currently always encode CR LF SP TAB directly */
|
|
if(c<=127 && encodeDirectly[c]) {
|
|
/* encode directly */
|
|
*target++=(uint8_t)c;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
} else if(c==PLUS) {
|
|
/* output +- for + */
|
|
*target++=PLUS;
|
|
if(target<targetLimit) {
|
|
*target++=MINUS;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
/* realign length and targetCapacity */
|
|
goto directMode;
|
|
} else {
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
cnv->charErrorBuffer[0]=MINUS;
|
|
cnv->charErrorBufferLength=1;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
} else {
|
|
/* un-read this character and switch to Unicode Mode */
|
|
--source;
|
|
*target++=PLUS;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
inDirectMode=false;
|
|
base64Counter=0;
|
|
goto unicodeMode;
|
|
}
|
|
--length;
|
|
}
|
|
if(source<sourceLimit && target>=targetLimit) {
|
|
/* target is full */
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
}
|
|
} else {
|
|
unicodeMode:
|
|
while(source<sourceLimit) {
|
|
if(target<targetLimit) {
|
|
c=*source++;
|
|
if(c<=127 && encodeDirectly[c]) {
|
|
/* encode directly */
|
|
inDirectMode=true;
|
|
|
|
/* trick: back out this character to make this easier */
|
|
--source;
|
|
|
|
/* terminate the base64 sequence */
|
|
if(base64Counter!=0) {
|
|
/* write remaining bits for the previous character */
|
|
*target++=toBase64[bits];
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex-1;
|
|
}
|
|
}
|
|
if(fromBase64[c]!=-1) {
|
|
/* need to terminate with a minus */
|
|
if(target<targetLimit) {
|
|
*target++=MINUS;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex-1;
|
|
}
|
|
} else {
|
|
cnv->charErrorBuffer[0]=MINUS;
|
|
cnv->charErrorBufferLength=1;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
}
|
|
goto directMode;
|
|
} else {
|
|
/*
|
|
* base64 this character:
|
|
* Output 2 or 3 base64 bytes for the remaining bits of the previous character
|
|
* and the bits of this character, each implicitly in UTF-16BE.
|
|
*
|
|
* Here, bits is an 8-bit variable because only 6 bits need to be kept from one
|
|
* character to the next. The actual 2 or 4 bits are shifted to the left edge
|
|
* of the 6-bits field 5..0 to make the termination of the base64 sequence easier.
|
|
*/
|
|
switch(base64Counter) {
|
|
case 0:
|
|
*target++=toBase64[c>>10];
|
|
if(target<targetLimit) {
|
|
*target++=toBase64[(c>>4)&0x3f];
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
} else {
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
cnv->charErrorBuffer[0]=toBase64[(c>>4)&0x3f];
|
|
cnv->charErrorBufferLength=1;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
}
|
|
bits=(uint8_t)((c&15)<<2);
|
|
base64Counter=1;
|
|
break;
|
|
case 1:
|
|
*target++=toBase64[bits|(c>>14)];
|
|
if(target<targetLimit) {
|
|
*target++=toBase64[(c>>8)&0x3f];
|
|
if(target<targetLimit) {
|
|
*target++=toBase64[(c>>2)&0x3f];
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
*offsets++=sourceIndex;
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
} else {
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
cnv->charErrorBuffer[0]=toBase64[(c>>2)&0x3f];
|
|
cnv->charErrorBufferLength=1;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
}
|
|
} else {
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
cnv->charErrorBuffer[0]=toBase64[(c>>8)&0x3f];
|
|
cnv->charErrorBuffer[1]=toBase64[(c>>2)&0x3f];
|
|
cnv->charErrorBufferLength=2;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
}
|
|
bits=(uint8_t)((c&3)<<4);
|
|
base64Counter=2;
|
|
break;
|
|
case 2:
|
|
*target++=toBase64[bits|(c>>12)];
|
|
if(target<targetLimit) {
|
|
*target++=toBase64[(c>>6)&0x3f];
|
|
if(target<targetLimit) {
|
|
*target++=toBase64[c&0x3f];
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
*offsets++=sourceIndex;
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
} else {
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
cnv->charErrorBuffer[0]=toBase64[c&0x3f];
|
|
cnv->charErrorBufferLength=1;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
}
|
|
} else {
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
cnv->charErrorBuffer[0]=toBase64[(c>>6)&0x3f];
|
|
cnv->charErrorBuffer[1]=toBase64[c&0x3f];
|
|
cnv->charErrorBufferLength=2;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
}
|
|
bits=0;
|
|
base64Counter=0;
|
|
break;
|
|
default:
|
|
/* will never occur */
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
/* target is full */
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if(pArgs->flush && source>=sourceLimit) {
|
|
/* flush remaining bits to the target */
|
|
if(!inDirectMode) {
|
|
if (base64Counter!=0) {
|
|
if(target<targetLimit) {
|
|
*target++=toBase64[bits];
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex-1;
|
|
}
|
|
} else {
|
|
cnv->charErrorBuffer[cnv->charErrorBufferLength++]=toBase64[bits];
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
}
|
|
}
|
|
/* Add final MINUS to terminate unicodeMode */
|
|
if(target<targetLimit) {
|
|
*target++=MINUS;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex-1;
|
|
}
|
|
} else {
|
|
cnv->charErrorBuffer[cnv->charErrorBufferLength++]=MINUS;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
}
|
|
}
|
|
/* reset the state for the next conversion */
|
|
cnv->fromUnicodeStatus=(cnv->fromUnicodeStatus&0xf0000000)|0x1000000; /* keep version, inDirectMode=true */
|
|
} else {
|
|
/* set the converter state back into UConverter */
|
|
cnv->fromUnicodeStatus=
|
|
(cnv->fromUnicodeStatus&0xf0000000)| /* keep version*/
|
|
((uint32_t)inDirectMode<<24)|((uint32_t)base64Counter<<16)|(uint32_t)bits;
|
|
}
|
|
|
|
/* write back the updated pointers */
|
|
pArgs->source=source;
|
|
pArgs->target=(char *)target;
|
|
pArgs->offsets=offsets;
|
|
return;
|
|
}
|
|
|
|
static const char * U_CALLCONV
|
|
_UTF7GetName(const UConverter *cnv) {
|
|
switch(cnv->fromUnicodeStatus>>28) {
|
|
case 1:
|
|
return "UTF-7,version=1";
|
|
default:
|
|
return "UTF-7";
|
|
}
|
|
}
|
|
U_CDECL_END
|
|
|
|
static const UConverterImpl _UTF7Impl={
|
|
UCNV_UTF7,
|
|
|
|
NULL,
|
|
NULL,
|
|
|
|
_UTF7Open,
|
|
NULL,
|
|
_UTF7Reset,
|
|
|
|
_UTF7ToUnicodeWithOffsets,
|
|
_UTF7ToUnicodeWithOffsets,
|
|
_UTF7FromUnicodeWithOffsets,
|
|
_UTF7FromUnicodeWithOffsets,
|
|
NULL,
|
|
|
|
NULL,
|
|
_UTF7GetName,
|
|
NULL, /* we don't need writeSub() because we never call a callback at fromUnicode() */
|
|
NULL,
|
|
ucnv_getCompleteUnicodeSet,
|
|
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
static const UConverterStaticData _UTF7StaticData={
|
|
sizeof(UConverterStaticData),
|
|
"UTF-7",
|
|
0, /* TODO CCSID for UTF-7 */
|
|
UCNV_IBM, UCNV_UTF7,
|
|
1, 4,
|
|
{ 0x3f, 0, 0, 0 }, 1, /* the subchar is not used */
|
|
false, false,
|
|
0,
|
|
0,
|
|
{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } /* reserved */
|
|
};
|
|
|
|
const UConverterSharedData _UTF7Data=
|
|
UCNV_IMMUTABLE_SHARED_DATA_INITIALIZER(&_UTF7StaticData, &_UTF7Impl);
|
|
|
|
/* IMAP mailbox name encoding ----------------------------------------------- */
|
|
|
|
/*
|
|
* RFC 2060: INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1
|
|
* http://www.ietf.org/rfc/rfc2060.txt
|
|
*
|
|
* 5.1.3. Mailbox International Naming Convention
|
|
*
|
|
* By convention, international mailbox names are specified using a
|
|
* modified version of the UTF-7 encoding described in [UTF-7]. The
|
|
* purpose of these modifications is to correct the following problems
|
|
* with UTF-7:
|
|
*
|
|
* 1) UTF-7 uses the "+" character for shifting; this conflicts with
|
|
* the common use of "+" in mailbox names, in particular USENET
|
|
* newsgroup names.
|
|
*
|
|
* 2) UTF-7's encoding is BASE64 which uses the "/" character; this
|
|
* conflicts with the use of "/" as a popular hierarchy delimiter.
|
|
*
|
|
* 3) UTF-7 prohibits the unencoded usage of "\"; this conflicts with
|
|
* the use of "\" as a popular hierarchy delimiter.
|
|
*
|
|
* 4) UTF-7 prohibits the unencoded usage of "~"; this conflicts with
|
|
* the use of "~" in some servers as a home directory indicator.
|
|
*
|
|
* 5) UTF-7 permits multiple alternate forms to represent the same
|
|
* string; in particular, printable US-ASCII characters can be
|
|
* represented in encoded form.
|
|
*
|
|
* In modified UTF-7, printable US-ASCII characters except for "&"
|
|
* represent themselves; that is, characters with octet values 0x20-0x25
|
|
* and 0x27-0x7e. The character "&" (0x26) is represented by the two-
|
|
* octet sequence "&-".
|
|
*
|
|
* All other characters (octet values 0x00-0x1f, 0x7f-0xff, and all
|
|
* Unicode 16-bit octets) are represented in modified BASE64, with a
|
|
* further modification from [UTF-7] that "," is used instead of "/".
|
|
* Modified BASE64 MUST NOT be used to represent any printing US-ASCII
|
|
* character which can represent itself.
|
|
*
|
|
* "&" is used to shift to modified BASE64 and "-" to shift back to US-
|
|
* ASCII. All names start in US-ASCII, and MUST end in US-ASCII (that
|
|
* is, a name that ends with a Unicode 16-bit octet MUST end with a "-
|
|
* ").
|
|
*
|
|
* For example, here is a mailbox name which mixes English, Japanese,
|
|
* and Chinese text: ~peter/mail/&ZeVnLIqe-/&U,BTFw-
|
|
*/
|
|
|
|
/*
|
|
* Tests for US-ASCII characters belonging to character classes
|
|
* defined in UTF-7.
|
|
*
|
|
* Set D (directly encoded characters) consists of the following
|
|
* characters: the upper and lower case letters A through Z
|
|
* and a through z, the 10 digits 0-9, and the following nine special
|
|
* characters (note that "+" and "=" are omitted):
|
|
* '(),-./:?
|
|
*
|
|
* Set O (optional direct characters) consists of the following
|
|
* characters (note that "\" and "~" are omitted):
|
|
* !"#$%&*;<=>@[]^_`{|}
|
|
*
|
|
* According to the rules in RFC 2152, the byte values for the following
|
|
* US-ASCII characters are not used in UTF-7 and are therefore illegal:
|
|
* - all C0 control codes except for CR LF TAB
|
|
* - BACKSLASH
|
|
* - TILDE
|
|
* - DEL
|
|
* - all codes beyond US-ASCII, i.e. all >127
|
|
*/
|
|
|
|
/* uses '&' not '+' to start a base64 sequence */
|
|
#define AMPERSAND 0x26
|
|
#define COMMA 0x2c
|
|
#define SLASH 0x2f
|
|
|
|
/* legal byte values: all US-ASCII graphic characters 0x20..0x7e */
|
|
#define isLegalIMAP(c) (0x20<=(c) && (c)<=0x7e)
|
|
|
|
/* direct-encode all of printable ASCII 0x20..0x7e except '&' 0x26 */
|
|
#define inSetDIMAP(c) (isLegalIMAP(c) && c!=AMPERSAND)
|
|
|
|
#define TO_BASE64_IMAP(n) ((n)<63 ? toBase64[n] : COMMA)
|
|
#define FROM_BASE64_IMAP(c) ((c)==COMMA ? 63 : (c)==SLASH ? -1 : fromBase64[c])
|
|
|
|
/*
|
|
* converter status values:
|
|
*
|
|
* toUnicodeStatus:
|
|
* 24 inDirectMode (boolean)
|
|
* 23..16 base64Counter (-1..7)
|
|
* 15..0 bits (up to 14 bits incoming base64)
|
|
*
|
|
* fromUnicodeStatus:
|
|
* 24 inDirectMode (boolean)
|
|
* 23..16 base64Counter (0..2)
|
|
* 7..0 bits (6 bits outgoing base64)
|
|
*
|
|
* ignore bits 31..25
|
|
*/
|
|
|
|
U_CDECL_BEGIN
|
|
static void U_CALLCONV
|
|
_IMAPToUnicodeWithOffsets(UConverterToUnicodeArgs *pArgs,
|
|
UErrorCode *pErrorCode) {
|
|
UConverter *cnv;
|
|
const uint8_t *source, *sourceLimit;
|
|
UChar *target;
|
|
const UChar *targetLimit;
|
|
int32_t *offsets;
|
|
|
|
uint8_t *bytes;
|
|
uint8_t byteIndex;
|
|
|
|
int32_t length, targetCapacity;
|
|
|
|
/* UTF-7 state */
|
|
uint16_t bits;
|
|
int8_t base64Counter;
|
|
UBool inDirectMode;
|
|
|
|
int8_t base64Value;
|
|
|
|
int32_t sourceIndex, nextSourceIndex;
|
|
|
|
UChar c;
|
|
uint8_t b;
|
|
|
|
/* set up the local pointers */
|
|
cnv=pArgs->converter;
|
|
|
|
source=(const uint8_t *)pArgs->source;
|
|
sourceLimit=(const uint8_t *)pArgs->sourceLimit;
|
|
target=pArgs->target;
|
|
targetLimit=pArgs->targetLimit;
|
|
offsets=pArgs->offsets;
|
|
/* get the state machine state */
|
|
{
|
|
uint32_t status=cnv->toUnicodeStatus;
|
|
inDirectMode=(UBool)((status>>24)&1);
|
|
base64Counter=(int8_t)(status>>16);
|
|
bits=(uint16_t)status;
|
|
}
|
|
bytes=cnv->toUBytes;
|
|
byteIndex=cnv->toULength;
|
|
|
|
/* sourceIndex=-1 if the current character began in the previous buffer */
|
|
sourceIndex=byteIndex==0 ? 0 : -1;
|
|
nextSourceIndex=0;
|
|
|
|
if(inDirectMode) {
|
|
directMode:
|
|
/*
|
|
* In Direct Mode, US-ASCII characters are encoded directly, i.e.,
|
|
* with their US-ASCII byte values.
|
|
* An ampersand starts Unicode (or "escape") Mode.
|
|
*
|
|
* In Direct Mode, only the sourceIndex is used.
|
|
*/
|
|
byteIndex=0;
|
|
length=(int32_t)(sourceLimit-source);
|
|
targetCapacity=(int32_t)(targetLimit-target);
|
|
if(length>targetCapacity) {
|
|
length=targetCapacity;
|
|
}
|
|
while(length>0) {
|
|
b=*source++;
|
|
if(!isLegalIMAP(b)) {
|
|
/* illegal */
|
|
bytes[0]=b;
|
|
byteIndex=1;
|
|
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
|
|
break;
|
|
} else if(b!=AMPERSAND) {
|
|
/* write directly encoded character */
|
|
*target++=b;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
} else /* AMPERSAND */ {
|
|
/* switch to Unicode mode */
|
|
nextSourceIndex=++sourceIndex;
|
|
inDirectMode=false;
|
|
byteIndex=0;
|
|
bits=0;
|
|
base64Counter=-1;
|
|
goto unicodeMode;
|
|
}
|
|
--length;
|
|
}
|
|
if(source<sourceLimit && target>=targetLimit) {
|
|
/* target is full */
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
}
|
|
} else {
|
|
unicodeMode:
|
|
/*
|
|
* In Unicode (or "escape") Mode, UTF-16BE is base64-encoded.
|
|
* The base64 sequence ends with any character that is not in the base64 alphabet.
|
|
* A terminating minus sign is consumed.
|
|
* US-ASCII must not be base64-ed.
|
|
*
|
|
* In Unicode Mode, the sourceIndex has the index to the start of the current
|
|
* base64 bytes, while nextSourceIndex is precisely parallel to source,
|
|
* keeping the index to the following byte.
|
|
* Note that in 2 out of 3 cases, UChars overlap within a base64 byte.
|
|
*/
|
|
while(source<sourceLimit) {
|
|
if(target<targetLimit) {
|
|
bytes[byteIndex++]=b=*source++;
|
|
++nextSourceIndex;
|
|
if(b>0x7e) {
|
|
/* illegal - test other illegal US-ASCII values by base64Value==-3 */
|
|
inDirectMode=true;
|
|
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
|
|
break;
|
|
} else if((base64Value=FROM_BASE64_IMAP(b))>=0) {
|
|
/* collect base64 bytes into UChars */
|
|
switch(base64Counter) {
|
|
case -1: /* -1 is immediately after the & */
|
|
case 0:
|
|
bits=base64Value;
|
|
base64Counter=1;
|
|
break;
|
|
case 1:
|
|
case 3:
|
|
case 4:
|
|
case 6:
|
|
bits=(uint16_t)((bits<<6)|base64Value);
|
|
++base64Counter;
|
|
break;
|
|
case 2:
|
|
c=(UChar)((bits<<4)|(base64Value>>2));
|
|
if(isLegalIMAP(c)) {
|
|
/* illegal */
|
|
inDirectMode=true;
|
|
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
|
|
goto endloop;
|
|
}
|
|
*target++=c;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
sourceIndex=nextSourceIndex-1;
|
|
}
|
|
bytes[0]=b; /* keep this byte in case an error occurs */
|
|
byteIndex=1;
|
|
bits=(uint16_t)(base64Value&3);
|
|
base64Counter=3;
|
|
break;
|
|
case 5:
|
|
c=(UChar)((bits<<2)|(base64Value>>4));
|
|
if(isLegalIMAP(c)) {
|
|
/* illegal */
|
|
inDirectMode=true;
|
|
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
|
|
goto endloop;
|
|
}
|
|
*target++=c;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
sourceIndex=nextSourceIndex-1;
|
|
}
|
|
bytes[0]=b; /* keep this byte in case an error occurs */
|
|
byteIndex=1;
|
|
bits=(uint16_t)(base64Value&15);
|
|
base64Counter=6;
|
|
break;
|
|
case 7:
|
|
c=(UChar)((bits<<6)|base64Value);
|
|
if(isLegalIMAP(c)) {
|
|
/* illegal */
|
|
inDirectMode=true;
|
|
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
|
|
goto endloop;
|
|
}
|
|
*target++=c;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
sourceIndex=nextSourceIndex;
|
|
}
|
|
byteIndex=0;
|
|
bits=0;
|
|
base64Counter=0;
|
|
break;
|
|
default:
|
|
/* will never occur */
|
|
break;
|
|
}
|
|
} else if(base64Value==-2) {
|
|
/* minus sign terminates the base64 sequence */
|
|
inDirectMode=true;
|
|
if(base64Counter==-1) {
|
|
/* &- i.e. a minus immediately following an ampersand */
|
|
*target++=AMPERSAND;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex-1;
|
|
}
|
|
} else {
|
|
/* absorb the minus and leave the Unicode Mode */
|
|
if(bits!=0 || (base64Counter!=0 && base64Counter!=3 && base64Counter!=6)) {
|
|
/* bits are illegally left over, a UChar is incomplete */
|
|
/* base64Counter other than 0, 3, 6 means non-minimal zero-padding, also illegal */
|
|
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
|
|
break;
|
|
}
|
|
}
|
|
sourceIndex=nextSourceIndex;
|
|
goto directMode;
|
|
} else {
|
|
if(base64Counter==-1) {
|
|
/* illegal: & immediately followed by something other than base64 or minus sign */
|
|
/* include the ampersand in the reported sequence */
|
|
--sourceIndex;
|
|
bytes[0]=AMPERSAND;
|
|
bytes[1]=b;
|
|
byteIndex=2;
|
|
}
|
|
/* base64Value==-1 for characters that are illegal only in Unicode mode */
|
|
/* base64Value==-3 for illegal characters */
|
|
/* illegal */
|
|
inDirectMode=true;
|
|
*pErrorCode=U_ILLEGAL_CHAR_FOUND;
|
|
break;
|
|
}
|
|
} else {
|
|
/* target is full */
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
endloop:
|
|
|
|
/*
|
|
* the end of the input stream and detection of truncated input
|
|
* are handled by the framework, but here we must check if we are in Unicode
|
|
* mode and byteIndex==0 because we must end in direct mode
|
|
*
|
|
* conditions:
|
|
* successful
|
|
* in Unicode mode and byteIndex==0
|
|
* end of input and no truncated input
|
|
*/
|
|
if( U_SUCCESS(*pErrorCode) &&
|
|
!inDirectMode && byteIndex==0 &&
|
|
pArgs->flush && source>=sourceLimit
|
|
) {
|
|
if(base64Counter==-1) {
|
|
/* & at the very end of the input */
|
|
/* make the ampersand the reported sequence */
|
|
bytes[0]=AMPERSAND;
|
|
byteIndex=1;
|
|
}
|
|
/* else if(base64Counter!=-1) byteIndex remains 0 because there is no particular byte sequence */
|
|
|
|
inDirectMode=true; /* avoid looping */
|
|
*pErrorCode=U_TRUNCATED_CHAR_FOUND;
|
|
}
|
|
|
|
/* set the converter state back into UConverter */
|
|
cnv->toUnicodeStatus=((uint32_t)inDirectMode<<24)|((uint32_t)((uint8_t)base64Counter)<<16)|(uint32_t)bits;
|
|
cnv->toULength=byteIndex;
|
|
|
|
/* write back the updated pointers */
|
|
pArgs->source=(const char *)source;
|
|
pArgs->target=target;
|
|
pArgs->offsets=offsets;
|
|
return;
|
|
}
|
|
|
|
static void U_CALLCONV
|
|
_IMAPFromUnicodeWithOffsets(UConverterFromUnicodeArgs *pArgs,
|
|
UErrorCode *pErrorCode) {
|
|
UConverter *cnv;
|
|
const UChar *source, *sourceLimit;
|
|
uint8_t *target, *targetLimit;
|
|
int32_t *offsets;
|
|
|
|
int32_t length, targetCapacity, sourceIndex;
|
|
UChar c;
|
|
uint8_t b;
|
|
|
|
/* UTF-7 state */
|
|
uint8_t bits;
|
|
int8_t base64Counter;
|
|
UBool inDirectMode;
|
|
|
|
/* set up the local pointers */
|
|
cnv=pArgs->converter;
|
|
|
|
/* set up the local pointers */
|
|
source=pArgs->source;
|
|
sourceLimit=pArgs->sourceLimit;
|
|
target=(uint8_t *)pArgs->target;
|
|
targetLimit=(uint8_t *)pArgs->targetLimit;
|
|
offsets=pArgs->offsets;
|
|
|
|
/* get the state machine state */
|
|
{
|
|
uint32_t status=cnv->fromUnicodeStatus;
|
|
inDirectMode=(UBool)((status>>24)&1);
|
|
base64Counter=(int8_t)(status>>16);
|
|
bits=(uint8_t)status;
|
|
}
|
|
|
|
/* UTF-7 always encodes UTF-16 code units, therefore we need only a simple sourceIndex */
|
|
sourceIndex=0;
|
|
|
|
if(inDirectMode) {
|
|
directMode:
|
|
length=(int32_t)(sourceLimit-source);
|
|
targetCapacity=(int32_t)(targetLimit-target);
|
|
if(length>targetCapacity) {
|
|
length=targetCapacity;
|
|
}
|
|
while(length>0) {
|
|
c=*source++;
|
|
/* encode 0x20..0x7e except '&' directly */
|
|
if(inSetDIMAP(c)) {
|
|
/* encode directly */
|
|
*target++=(uint8_t)c;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
} else if(c==AMPERSAND) {
|
|
/* output &- for & */
|
|
*target++=AMPERSAND;
|
|
if(target<targetLimit) {
|
|
*target++=MINUS;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
/* realign length and targetCapacity */
|
|
goto directMode;
|
|
} else {
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
cnv->charErrorBuffer[0]=MINUS;
|
|
cnv->charErrorBufferLength=1;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
} else {
|
|
/* un-read this character and switch to Unicode Mode */
|
|
--source;
|
|
*target++=AMPERSAND;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
}
|
|
inDirectMode=false;
|
|
base64Counter=0;
|
|
goto unicodeMode;
|
|
}
|
|
--length;
|
|
}
|
|
if(source<sourceLimit && target>=targetLimit) {
|
|
/* target is full */
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
}
|
|
} else {
|
|
unicodeMode:
|
|
while(source<sourceLimit) {
|
|
if(target<targetLimit) {
|
|
c=*source++;
|
|
if(isLegalIMAP(c)) {
|
|
/* encode directly */
|
|
inDirectMode=true;
|
|
|
|
/* trick: back out this character to make this easier */
|
|
--source;
|
|
|
|
/* terminate the base64 sequence */
|
|
if(base64Counter!=0) {
|
|
/* write remaining bits for the previous character */
|
|
*target++=TO_BASE64_IMAP(bits);
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex-1;
|
|
}
|
|
}
|
|
/* need to terminate with a minus */
|
|
if(target<targetLimit) {
|
|
*target++=MINUS;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex-1;
|
|
}
|
|
} else {
|
|
cnv->charErrorBuffer[0]=MINUS;
|
|
cnv->charErrorBufferLength=1;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
goto directMode;
|
|
} else {
|
|
/*
|
|
* base64 this character:
|
|
* Output 2 or 3 base64 bytes for the remaining bits of the previous character
|
|
* and the bits of this character, each implicitly in UTF-16BE.
|
|
*
|
|
* Here, bits is an 8-bit variable because only 6 bits need to be kept from one
|
|
* character to the next. The actual 2 or 4 bits are shifted to the left edge
|
|
* of the 6-bits field 5..0 to make the termination of the base64 sequence easier.
|
|
*/
|
|
switch(base64Counter) {
|
|
case 0:
|
|
b=(uint8_t)(c>>10);
|
|
*target++=TO_BASE64_IMAP(b);
|
|
if(target<targetLimit) {
|
|
b=(uint8_t)((c>>4)&0x3f);
|
|
*target++=TO_BASE64_IMAP(b);
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
} else {
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
b=(uint8_t)((c>>4)&0x3f);
|
|
cnv->charErrorBuffer[0]=TO_BASE64_IMAP(b);
|
|
cnv->charErrorBufferLength=1;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
}
|
|
bits=(uint8_t)((c&15)<<2);
|
|
base64Counter=1;
|
|
break;
|
|
case 1:
|
|
b=(uint8_t)(bits|(c>>14));
|
|
*target++=TO_BASE64_IMAP(b);
|
|
if(target<targetLimit) {
|
|
b=(uint8_t)((c>>8)&0x3f);
|
|
*target++=TO_BASE64_IMAP(b);
|
|
if(target<targetLimit) {
|
|
b=(uint8_t)((c>>2)&0x3f);
|
|
*target++=TO_BASE64_IMAP(b);
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
*offsets++=sourceIndex;
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
} else {
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
b=(uint8_t)((c>>2)&0x3f);
|
|
cnv->charErrorBuffer[0]=TO_BASE64_IMAP(b);
|
|
cnv->charErrorBufferLength=1;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
}
|
|
} else {
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
b=(uint8_t)((c>>8)&0x3f);
|
|
cnv->charErrorBuffer[0]=TO_BASE64_IMAP(b);
|
|
b=(uint8_t)((c>>2)&0x3f);
|
|
cnv->charErrorBuffer[1]=TO_BASE64_IMAP(b);
|
|
cnv->charErrorBufferLength=2;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
}
|
|
bits=(uint8_t)((c&3)<<4);
|
|
base64Counter=2;
|
|
break;
|
|
case 2:
|
|
b=(uint8_t)(bits|(c>>12));
|
|
*target++=TO_BASE64_IMAP(b);
|
|
if(target<targetLimit) {
|
|
b=(uint8_t)((c>>6)&0x3f);
|
|
*target++=TO_BASE64_IMAP(b);
|
|
if(target<targetLimit) {
|
|
b=(uint8_t)(c&0x3f);
|
|
*target++=TO_BASE64_IMAP(b);
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
*offsets++=sourceIndex;
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
} else {
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex;
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
b=(uint8_t)(c&0x3f);
|
|
cnv->charErrorBuffer[0]=TO_BASE64_IMAP(b);
|
|
cnv->charErrorBufferLength=1;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
}
|
|
} else {
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex++;
|
|
}
|
|
b=(uint8_t)((c>>6)&0x3f);
|
|
cnv->charErrorBuffer[0]=TO_BASE64_IMAP(b);
|
|
b=(uint8_t)(c&0x3f);
|
|
cnv->charErrorBuffer[1]=TO_BASE64_IMAP(b);
|
|
cnv->charErrorBufferLength=2;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
}
|
|
bits=0;
|
|
base64Counter=0;
|
|
break;
|
|
default:
|
|
/* will never occur */
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
/* target is full */
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if(pArgs->flush && source>=sourceLimit) {
|
|
/* flush remaining bits to the target */
|
|
if(!inDirectMode) {
|
|
if(base64Counter!=0) {
|
|
if(target<targetLimit) {
|
|
*target++=TO_BASE64_IMAP(bits);
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex-1;
|
|
}
|
|
} else {
|
|
cnv->charErrorBuffer[cnv->charErrorBufferLength++]=TO_BASE64_IMAP(bits);
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
}
|
|
}
|
|
/* need to terminate with a minus */
|
|
if(target<targetLimit) {
|
|
*target++=MINUS;
|
|
if(offsets!=NULL) {
|
|
*offsets++=sourceIndex-1;
|
|
}
|
|
} else {
|
|
cnv->charErrorBuffer[cnv->charErrorBufferLength++]=MINUS;
|
|
*pErrorCode=U_BUFFER_OVERFLOW_ERROR;
|
|
}
|
|
}
|
|
/* reset the state for the next conversion */
|
|
cnv->fromUnicodeStatus=(cnv->fromUnicodeStatus&0xf0000000)|0x1000000; /* keep version, inDirectMode=true */
|
|
} else {
|
|
/* set the converter state back into UConverter */
|
|
cnv->fromUnicodeStatus=
|
|
(cnv->fromUnicodeStatus&0xf0000000)| /* keep version*/
|
|
((uint32_t)inDirectMode<<24)|((uint32_t)base64Counter<<16)|(uint32_t)bits;
|
|
}
|
|
|
|
/* write back the updated pointers */
|
|
pArgs->source=source;
|
|
pArgs->target=(char *)target;
|
|
pArgs->offsets=offsets;
|
|
return;
|
|
}
|
|
U_CDECL_END
|
|
|
|
static const UConverterImpl _IMAPImpl={
|
|
UCNV_IMAP_MAILBOX,
|
|
|
|
NULL,
|
|
NULL,
|
|
|
|
_UTF7Open,
|
|
NULL,
|
|
_UTF7Reset,
|
|
|
|
_IMAPToUnicodeWithOffsets,
|
|
_IMAPToUnicodeWithOffsets,
|
|
_IMAPFromUnicodeWithOffsets,
|
|
_IMAPFromUnicodeWithOffsets,
|
|
NULL,
|
|
|
|
NULL,
|
|
NULL,
|
|
NULL, /* we don't need writeSub() because we never call a callback at fromUnicode() */
|
|
NULL,
|
|
ucnv_getCompleteUnicodeSet,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
static const UConverterStaticData _IMAPStaticData={
|
|
sizeof(UConverterStaticData),
|
|
"IMAP-mailbox-name",
|
|
0, /* TODO CCSID for IMAP-mailbox-name */
|
|
UCNV_IBM, UCNV_IMAP_MAILBOX,
|
|
1, 4,
|
|
{ 0x3f, 0, 0, 0 }, 1, /* the subchar is not used */
|
|
false, false,
|
|
0,
|
|
0,
|
|
{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } /* reserved */
|
|
};
|
|
|
|
const UConverterSharedData _IMAPData=
|
|
UCNV_IMMUTABLE_SHARED_DATA_INITIALIZER(&_IMAPStaticData, &_IMAPImpl);
|
|
|
|
#endif
|