| // © 2016 and later: Unicode, Inc. and others. |
| // License & terms of use: http://www.unicode.org/copyright.html |
| /* |
| ********************************************************************** |
| * Copyright (C) 2002-2016, International Business Machines |
| * Corporation and others. All Rights Reserved. |
| ********************************************************************** |
| * file name: ucnv_u7.c |
| * encoding: UTF-8 |
| * tab size: 8 (not used) |
| * indentation:4 |
| * |
| * created on: 2002jul01 |
| * created by: Markus W. Scherer |
| * |
| * UTF-7 converter implementation. Used to be in ucnv_utf.c. |
| */ |
| |
| #include "unicode/utypes.h" |
| |
| #if !UCONFIG_NO_CONVERSION && !UCONFIG_ONLY_HTML_CONVERSION |
| |
| #include "cmemory.h" |
| #include "unicode/ucnv.h" |
| #include "ucnv_bld.h" |
| #include "ucnv_cnv.h" |
| #include "uassert.h" |
| |
| /* UTF-7 -------------------------------------------------------------------- */ |
| |
| /* |
| * UTF-7 is a stateful encoding of Unicode. |
| * It is defined in RFC 2152. (http://www.ietf.org/rfc/rfc2152.txt) |
| * It was intended for use in Internet email systems, using in its bytewise |
| * encoding only a subset of 7-bit US-ASCII. |
| * UTF-7 is deprecated in favor of UTF-8/16/32 and SCSU, but still |
| * occasionally used. |
| * |
| * For converting Unicode to UTF-7, the RFC allows to encode some US-ASCII |
| * characters directly or in base64. Especially, the characters in set O |
| * as defined in the RFC (see below) may be encoded directly but are not |
| * allowed in, e.g., email headers. |
| * By default, the ICU UTF-7 converter encodes set O directly. |
| * By choosing the option "version=1", set O will be escaped instead. |
| * For example: |
| * utf7Converter=ucnv_open("UTF-7,version=1"); |
| * |
| * For details about email headers see RFC 2047. |
| */ |
| |
| /* |
| * 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): |
| * !"#$%&*;<=>@[]^_`{|} |
| * |
| * According to the rules in RFC 2152, the byte values for the following |
| * US-ASCII characters are not used in UTF-7 and are therefore illegal: |
| * - all C0 control codes except for CR LF TAB |
| * - BACKSLASH |
| * - TILDE |
| * - DEL |
| * - all codes beyond US-ASCII, i.e. all >127 |
| */ |
| #define inSetD(c) \ |
| ((uint8_t)((c)-97)<26 || (uint8_t)((c)-65)<26 || /* letters */ \ |
| (uint8_t)((c)-48)<10 || /* digits */ \ |
| (uint8_t)((c)-39)<3 || /* '() */ \ |
| (uint8_t)((c)-44)<4 || /* ,-./ */ \ |
| (c)==58 || (c)==63 /* :? */ \ |
| ) |
| |
| #define inSetO(c) \ |
| ((uint8_t)((c)-33)<6 || /* !"#$%& */ \ |
| (uint8_t)((c)-59)<4 || /* ;<=> */ \ |
| (uint8_t)((c)-93)<4 || /* ]^_` */ \ |
| (uint8_t)((c)-123)<3 || /* {|} */ \ |
| (c)==42 || (c)==64 || (c)==91 /* *@[ */ \ |
| ) |
| |
| #define isCRLFTAB(c) ((c)==13 || (c)==10 || (c)==9) |
| #define isCRLFSPTAB(c) ((c)==32 || (c)==13 || (c)==10 || (c)==9) |
| |
| #define PLUS 43 |
| #define MINUS 45 |
| #define BACKSLASH 92 |
| #define TILDE 126 |
| |
| /* legal byte values: all US-ASCII graphic characters from space to before tilde, and CR LF TAB */ |
| #define isLegalUTF7(c) (((uint8_t)((c)-32)<94 && (c)!=BACKSLASH) || isCRLFTAB(c)) |
| |
| /* encode directly sets D and O and CR LF SP TAB */ |
| static const UBool encodeDirectlyMaximum[128]={ |
| /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */ |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, |
| |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0 |
| }; |
| |
| /* encode directly set D and CR LF SP TAB but not set O */ |
| static const UBool encodeDirectlyRestricted[128]={ |
| /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */ |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| |
| 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, |
| |
| 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, |
| |
| 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 |
| }; |
| |
| static const uint8_t |
| toBase64[64]={ |
| /* A-Z */ |
| 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, |
| 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, |
| /* a-z */ |
| 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, |
| 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, |
| /* 0-9 */ |
| 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, |
| /* +/ */ |
| 43, 47 |
| }; |
| |
| static const int8_t |
| fromBase64[128]={ |
| /* C0 controls, -1 for legal ones (CR LF TAB), -3 for illegal ones */ |
| -3, -3, -3, -3, -3, -3, -3, -3, -3, -1, -1, -3, -3, -1, -3, -3, |
| -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, |
| |
| /* general punctuation with + and / and a special value (-2) for - */ |
| -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -2, -1, 63, |
| /* digits */ |
| 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, |
| |
| /* A-Z */ |
| -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, |
| 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -3, -1, -1, -1, |
| |
| /* a-z */ |
| -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, |
| 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -3, -3 |
| }; |
| |
| /* |
| * converter status values: |
| * |
| * toUnicodeStatus: |
| * 24 inDirectMode (boolean) |
| * 23..16 base64Counter (-1..7) |
| * 15..0 bits (up to 14 bits incoming base64) |
| * |
| * fromUnicodeStatus: |
| * 31..28 version (0: set O direct 1: set O escaped) |
| * 24 inDirectMode (boolean) |
| * 23..16 base64Counter (0..2) |
| * 7..0 bits (6 bits outgoing base64) |
| * |
| */ |
| |
| U_CDECL_BEGIN |
| static void U_CALLCONV |
| _UTF7Reset(UConverter *cnv, UConverterResetChoice choice) { |
| if(choice<=UCNV_RESET_TO_UNICODE) { |
| /* reset toUnicode */ |
| cnv->toUnicodeStatus=0x1000000; /* inDirectMode=TRUE */ |
| cnv->toULength=0; |
| } |
| if(choice!=UCNV_RESET_TO_UNICODE) { |
| /* reset fromUnicode */ |
| cnv->fromUnicodeStatus=(cnv->fromUnicodeStatus&0xf0000000)|0x1000000; /* keep version, inDirectMode=TRUE */ |
| } |
| } |
| |
| static void U_CALLCONV |
| _UTF7Open(UConverter *cnv, |
| UConverterLoadArgs *pArgs, |
| UErrorCode *pErrorCode) { |
| (void)pArgs; |
| if(UCNV_GET_VERSION(cnv)<=1) { |
| /* TODO(markus): Should just use cnv->options rather than copying the version number. */ |
| cnv->fromUnicodeStatus=UCNV_GET_VERSION(cnv)<<28; |
| _UTF7Reset(cnv, UCNV_RESET_BOTH); |
| } else { |
| *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR; |
| } |
| } |
| |
| static void U_CALLCONV |
| _UTF7ToUnicodeWithOffsets(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; |
| |
| 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, most US-ASCII characters are encoded directly, i.e., |
| * with their US-ASCII byte values. |
| * Backslash and Tilde and most control characters are not allowed in UTF-7. |
| * A plus sign 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(!isLegalUTF7(b)) { |
| /* illegal */ |
| bytes[0]=b; |
| byteIndex=1; |
| *pErrorCode=U_ILLEGAL_CHAR_FOUND; |
| break; |
| } else if(b!=PLUS) { |
| /* write directly encoded character */ |
| *target++=b; |
| if(offsets!=NULL) { |
| *offsets++=sourceIndex++; |
| } |
| } else /* PLUS */ { |
| /* 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. |
| * |
| * 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; |
| base64Value = -3; /* initialize as illegal */ |
| if(b>=126 || (base64Value=fromBase64[b])==-3 || base64Value==-1) { |
| /* either |
| * base64Value==-1 for any legal character except base64 and minus sign, or |
| * base64Value==-3 for illegal characters: |
| * 1. In either case, leave Unicode mode. |
| * 2.1. If we ended with an incomplete UChar or none after the +, then |
| * generate an error for the preceding erroneous sequence and deal with |
| * the current (possibly illegal) character next time through. |
| * 2.2. Else the current char comes after a complete UChar, which was already |
| * pushed to the output buf, so: |
| * 2.2.1. If the current char is legal, just save it for processing next time. |
| * It may be for example, a plus which we need to deal with in direct mode. |
| * 2.2.2. Else if the current char is illegal, we might as well deal with it here. |
| */ |
| inDirectMode=TRUE; |
| if(base64Counter==-1) { |
| /* illegal: + immediately followed by something other than base64 or minus sign */ |
| /* include the plus sign in the reported sequence, but not the subsequent char */ |
| --source; |
| bytes[0]=PLUS; |
| byteIndex=1; |
| *pErrorCode=U_ILLEGAL_CHAR_FOUND; |
| break; |
| } else if(bits!=0) { |
| /* bits are illegally left over, a UChar is incomplete */ |
| /* don't include current char (legal or illegal) in error seq */ |
| --source; |
| --byteIndex; |
| *pErrorCode=U_ILLEGAL_CHAR_FOUND; |
| break; |
| } else { |
| /* previous UChar was complete */ |
| if(base64Value==-3) { |
| /* current character is illegal, deal with it here */ |
| *pErrorCode=U_ILLEGAL_CHAR_FOUND; |
| break; |
| } else { |
| /* un-read the current character in case it is a plus sign */ |
| --source; |
| sourceIndex=nextSourceIndex-1; |
| goto directMode; |
| } |
| } |
| } else if(base64Value>=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: |
| *target++=(UChar)((bits<<4)|(base64Value>>2)); |
| 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: |
| *target++=(UChar)((bits<<2)|(base64Value>>4)); |
| 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: |
| *target++=(UChar)((bits<<6)|base64Value); |
| if(offsets!=NULL) { |
| *offsets++=sourceIndex; |
| sourceIndex=nextSourceIndex; |
| } |
| byteIndex=0; |
| bits=0; |
| base64Counter=0; |
| break; |
| default: |
| /* will never occur */ |
| break; |
| } |
| } else /*base64Value==-2*/ { |
| /* minus sign terminates the base64 sequence */ |
| inDirectMode=TRUE; |
| if(base64Counter==-1) { |
| /* +- i.e. a minus immediately following a plus */ |
| *target++=PLUS; |
| if(offsets!=NULL) { |
| *offsets++=sourceIndex-1; |
| } |
| } else { |
| /* absorb the minus and leave the Unicode Mode */ |
| if(bits!=0) { |
| /* bits are illegally left over, a UChar is incomplete */ |
| *pErrorCode=U_ILLEGAL_CHAR_FOUND; |
| break; |
| } |
| } |
| sourceIndex=nextSourceIndex; |
| goto directMode; |
| } |
| } else { |
| /* target is full */ |
| *pErrorCode=U_BUFFER_OVERFLOW_ERROR; |
| break; |
| } |
| } |
| } |
| |
| if(U_SUCCESS(*pErrorCode) && pArgs->flush && source==sourceLimit && bits==0) { |
| /* |
| * if we are in Unicode mode, then the byteIndex might not be 0, |
| * but that is ok if bits==0 |
| * -> we set byteIndex=0 at the end of the stream to avoid a truncated error |
| * (not true for IMAP-mailbox-name where we must end in direct mode) |
| */ |
| byteIndex=0; |
| } |
| |
| /* 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 |
| _UTF7FromUnicodeWithOffsets(UConverterFromUnicodeArgs *pArgs, |
| 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 chararacters 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 |
