Index: icu46/source/common/ucnv_u7.c |
=================================================================== |
--- icu46/source/common/ucnv_u7.c (revision 0) |
+++ icu46/source/common/ucnv_u7.c (revision 0) |
@@ -0,0 +1,1458 @@ |
+/* |
+********************************************************************** |
+* Copyright (C) 2002-2009, International Business Machines |
+* Corporation and others. All Rights Reserved. |
+********************************************************************** |
+* file name: ucnv_u7.c |
+* encoding: US-ASCII |
+* 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 |
+ |
+#include "unicode/ucnv.h" |
+#include "ucnv_bld.h" |
+#include "ucnv_cnv.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) |
+ * |
+ */ |
+ |
+static void |
+_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 |
+_UTF7Open(UConverter *cnv, |
+ UConverterLoadArgs *pArgs, |
+ UErrorCode *pErrorCode) { |
+ 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 |
+_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; |
+ if(b>=126) { |
+ /* illegal - test other illegal US-ASCII values by base64Value==-3 */ |
+ inDirectMode=TRUE; |
+ *pErrorCode=U_ILLEGAL_CHAR_FOUND; |
+ break; |
+ } else if((base64Value=fromBase64[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: |
+ *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 if(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 if(base64Value==-1) /* for any legal character except base64 and minus sign */ { |
+ /* leave the Unicode Mode */ |
+ inDirectMode=TRUE; |
+ if(base64Counter==-1) { |
+ /* illegal: + immediately followed by something other than base64 or minus sign */ |
+ /* include the plus sign in the reported sequence */ |
+ --sourceIndex; |
+ bytes[0]=PLUS; |
+ bytes[1]=b; |
+ byteIndex=2; |
+ *pErrorCode=U_ILLEGAL_CHAR_FOUND; |
+ break; |
+ } else if(bits==0) { |
+ /* un-read the character in case it is a plus sign */ |
+ --source; |
+ sourceIndex=nextSourceIndex-1; |
+ goto directMode; |
+ } else { |
+ /* bits are illegally left over, a UChar is incomplete */ |
+ *pErrorCode=U_ILLEGAL_CHAR_FOUND; |
+ break; |
+ } |
+ } else /* base64Value==-3 for illegal characters */ { |
+ /* illegal */ |
+ inDirectMode=TRUE; |
+ *pErrorCode=U_ILLEGAL_CHAR_FOUND; |
+ break; |
+ } |
+ } 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 |
+_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; |
+ } |
+ |
+ /* 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 && 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; |
+ } |
+ } |
+ /* 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 * |
+_UTF7GetName(const UConverter *cnv) { |
+ switch(cnv->fromUnicodeStatus>>28) { |
+ case 1: |
+ return "UTF-7,version=1"; |
+ default: |
+ return "UTF-7"; |
+ } |
+} |
+ |
+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 |
+}; |
+ |
+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={ |
+ sizeof(UConverterSharedData), ~((uint32_t)0), |
+ NULL, NULL, &_UTF7StaticData, FALSE, &_UTF7Impl, |
+ 0 |
+}; |
+ |
+/* 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 |
+ */ |
+ |
+static void |
+_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 |
+_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; |
+} |
+ |
+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 |
+}; |
+ |
+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={ |
+ sizeof(UConverterSharedData), ~((uint32_t)0), |
+ NULL, NULL, &_IMAPStaticData, FALSE, &_IMAPImpl, |
+ 0 |
+}; |
+ |
+#endif |
Property changes on: icu46/source/common/ucnv_u7.c |
___________________________________________________________________ |
Added: svn:eol-style |
+ LF |