--- /dev/null
+// © 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
projects / apple / icu.git / blobdiff