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/*
**********************************************************************
* Copyright (C) 2000-2001, International Business Machines
* Corporation and others. All Rights Reserved.
**********************************************************************
* file name: ucnvhz.c
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
*
* created on: 2000oct16
* created by: Ram Viswanadha
* 10/31/2000 Ram Implemented offsets logic function
*
*/
#include "unicode/utypes.h"
#include "cmemory.h"
#include "unicode/ucnv_err.h"
#include "ucnv_bld.h"
#include "unicode/ucnv.h"
#include "ucnv_cnv.h"
#include "unicode/ucnv_cb.h"
#define UCNV_TILDE 0x7E /* ~ */
#define UCNV_OPEN_BRACE 0x7B /* { */
#define UCNV_CLOSE_BRACE 0x7D /* } */
#define SB_ESCAPE "\x7E\x7D"
#define DB_ESCAPE "\x7E\x7B"
#define TILDE_ESCAPE "\x7E\x7E"
#define ESC_LEN 2
#define CONCAT_ESCAPE_MACRO( args, targetIndex,targetLength,strToAppend, err, len,sourceIndex){ \
while(len-->0){ \
if(targetIndex < targetLength){ \
args->target[targetIndex] = (unsigned char) *strToAppend; \
if(args->offsets!=NULL){ \
*(offsets++) = sourceIndex-1; \
} \
targetIndex++; \
} \
else{ \
args->converter->charErrorBuffer[(int)args->converter->charErrorBufferLength++] = (unsigned char) *strToAppend; \
*err =U_BUFFER_OVERFLOW_ERROR; \
} \
strToAppend++; \
} \
}
typedef struct{
int32_t targetIndex;
int32_t sourceIndex;
UBool isEscapeAppended;
UConverter* gbConverter;
UBool isStateDBCS;
UBool isTargetUCharDBCS;
}UConverterDataHZ;
static void
_HZOpen(UConverter *cnv, const char *name,const char *locale,uint32_t options, UErrorCode *errorCode){
cnv->toUnicodeStatus = 0;
cnv->fromUnicodeStatus= 0;
cnv->mode=0;
cnv->fromUSurrogateLead=0x0000;
cnv->extraInfo = uprv_malloc (sizeof (UConverterDataHZ));
if(cnv->extraInfo != NULL){
((UConverterDataHZ*)cnv->extraInfo)->gbConverter = ucnv_open("ibm-1386",errorCode);
((UConverterDataHZ*)cnv->extraInfo)->isStateDBCS = FALSE;
((UConverterDataHZ*)cnv->extraInfo)->isEscapeAppended = FALSE;
((UConverterDataHZ*)cnv->extraInfo)->targetIndex = 0;
((UConverterDataHZ*)cnv->extraInfo)->sourceIndex = 0;
((UConverterDataHZ*)cnv->extraInfo)->isTargetUCharDBCS = FALSE;
}
}
static void
_HZClose(UConverter *cnv){
if((cnv->extraInfo != NULL) && !cnv->isCopyLocal){
ucnv_close (((UConverterDataHZ *) (cnv->extraInfo))->gbConverter);
uprv_free(cnv->extraInfo);
}
}
static void
_HZReset(UConverter *cnv, UConverterResetChoice choice){
if(choice<=UCNV_RESET_TO_UNICODE) {
cnv->toUnicodeStatus = 0;
cnv->mode=0;
if(cnv->extraInfo != NULL){
((UConverterDataHZ*)cnv->extraInfo)->isStateDBCS = FALSE;
}
}
if(choice!=UCNV_RESET_TO_UNICODE) {
cnv->fromUnicodeStatus= 0;
cnv->fromUSurrogateLead=0x0000;
if(cnv->extraInfo != NULL){
((UConverterDataHZ*)cnv->extraInfo)->isEscapeAppended = FALSE;
((UConverterDataHZ*)cnv->extraInfo)->targetIndex = 0;
((UConverterDataHZ*)cnv->extraInfo)->sourceIndex = 0;
((UConverterDataHZ*)cnv->extraInfo)->isTargetUCharDBCS = FALSE;
}
}
}
/**************************************HZ Encoding*************************************************
* Rules for HZ encoding
*
* In ASCII mode, a byte is interpreted as an ASCII character, unless a
* '~' is encountered. The character '~' is an escape character. By
* convention, it must be immediately followed ONLY by '~', '{' or '\n'
* (<LF>), with the following special meaning.
* 1. The escape sequence '~~' is interpreted as a '~'.
* 2. The escape-to-GB sequence '~{' switches the mode from ASCII to GB.
* 3. The escape sequence '~\n' is a line-continuation marker to be
* consumed with no output produced.
* In GB mode, characters are interpreted two bytes at a time as (pure)
* GB codes until the escape-from-GB code '~}' is read. This code
* switches the mode from GB back to ASCII. (Note that the escape-
* from-GB code '~}' ($7E7D) is outside the defined GB range.)
*
* Source: RFC 1842
*/
static void
UConverter_toUnicode_HZ_OFFSETS_LOGIC(UConverterToUnicodeArgs *args,
UErrorCode* err){
char tempBuf[3];
const char* pBuf;
const char *mySource = ( char *) args->source;
UChar *myTarget = args->target;
char *tempLimit = &tempBuf[3];
const char *mySourceLimit = args->sourceLimit;
UChar32 targetUniChar = 0x0000;
UChar mySourceChar = 0x0000;
UConverterDataHZ* myData=(UConverterDataHZ*)(args->converter->extraInfo);
if ((args->converter == NULL) || (args->targetLimit < args->target) || (args->sourceLimit < args->source)){
*err = U_ILLEGAL_ARGUMENT_ERROR;
return;
}
while(mySource< args->sourceLimit){
if(myTarget < args->targetLimit){
mySourceChar= (unsigned char) *mySource++;
switch(mySourceChar){
case 0x0A:
if(args->converter->mode ==UCNV_TILDE){
args->converter->mode=0;
}
*(myTarget++)=(UChar)mySourceChar;
continue;
case UCNV_TILDE:
if(args->converter->mode ==UCNV_TILDE){
*(myTarget++)=(UChar)mySourceChar;
args->converter->mode=0;
continue;
}
else if(args->converter->toUnicodeStatus !=0){
args->converter->mode=0;
break;
}
else{
args->converter->mode = UCNV_TILDE;
continue;
}
case UCNV_OPEN_BRACE:
if(args->converter->mode == UCNV_TILDE){
args->converter->mode=0;
myData->isStateDBCS = TRUE;
continue;
}
else{
break;
}
case UCNV_CLOSE_BRACE:
if(args->converter->mode == UCNV_TILDE){
args->converter->mode=0;
myData->isStateDBCS = FALSE;
continue;
}
else{
break;
}
default:
/* if the first byte is equal to TILDE and the trail byte
* is not a valid byte then it is an error condition
*/
if(args->converter->mode == UCNV_TILDE){
args->converter->mode=0;
mySourceChar= (UChar)(((UCNV_TILDE+0x80) << 8) | ((mySourceChar & 0x00ff)+0x80));
goto SAVE_STATE;
}
break;
}
if(myData->isStateDBCS){
if(args->converter->toUnicodeStatus == 0x00){
args->converter->toUnicodeStatus = (UChar) mySourceChar;
continue;
}
else{
tempBuf[0] = (char) (args->converter->toUnicodeStatus+0x80) ;
tempBuf[1] = (char) (mySourceChar+0x80);
mySourceChar= (UChar)(((args->converter->toUnicodeStatus+0x80) << 8) | ((mySourceChar & 0x00ff)+0x80));
args->converter->toUnicodeStatus =0x00;
pBuf = &tempBuf[0];
tempLimit = &tempBuf[2]+1;
targetUniChar = _MBCSSimpleGetNextUChar(myData->gbConverter->sharedData,
&pBuf,tempLimit,args->converter->useFallback);
}
}
else{
if(args->converter->fromUnicodeStatus == 0x00){
tempBuf[0] = (char) mySourceChar;
pBuf = &tempBuf[0];
tempLimit = &tempBuf[1];
targetUniChar = _MBCSSimpleGetNextUChar(myData->gbConverter->sharedData,
&pBuf,tempLimit,args->converter->useFallback);
}
else{
goto SAVE_STATE;
}
}
if(targetUniChar < 0xfffe){
if(args->offsets)
args->offsets[myTarget - args->target]=mySource - args->source - 1-(myData->isStateDBCS);
*(myTarget++)=(UChar)targetUniChar;
}
else if(targetUniChar>=0xfffe){
SAVE_STATE:
{
const char *saveSource = args->source;
UChar *saveTarget = args->target;
int32_t *saveOffsets = args->offsets;
UConverterCallbackReason reason;
int32_t currentOffset ;
int32_t saveIndex = myTarget - args->target;
args->converter->invalidCharLength=0;
if(targetUniChar == 0xfffe){
reason = UCNV_UNASSIGNED;
*err = U_INVALID_CHAR_FOUND;
}
else{
reason = UCNV_ILLEGAL;
*err = U_ILLEGAL_CHAR_FOUND;
}
if(myData->isStateDBCS){
args->converter->invalidCharBuffer[args->converter->invalidCharLength++] = (char)(tempBuf[0]-0x80);
args->converter->invalidCharBuffer[args->converter->invalidCharLength++] = (char)(tempBuf[1]-0x80);
currentOffset= mySource - args->source -2;
}
else{
args->converter->invalidCharBuffer[args->converter->invalidCharLength++] = (char)mySourceChar;
currentOffset= mySource - args->source -1;
}
args->offsets = args->offsets?args->offsets+(myTarget - args->target):0;
args->target = myTarget;
args->source = mySource;
myTarget = saveTarget;
args->converter->fromCharErrorBehaviour (
args->converter->toUContext,
args,
args->converter->invalidCharBuffer,
args->converter->invalidCharLength,
reason,
err);
if(args->offsets){
args->offsets = saveOffsets;
for (;saveIndex < (args->target - myTarget);saveIndex++) {
args->offsets[saveIndex] += currentOffset;
}
}
args->source = saveSource;
myTarget = args->target;
args->target = saveTarget;
args->offsets = saveOffsets;
if(U_FAILURE(*err))
break;
}
}
}
else{
*err =U_BUFFER_OVERFLOW_ERROR;
break;
}
}
if((args->flush==TRUE)
&& (mySource == mySourceLimit)
&& ( args->converter->toUnicodeStatus !=0x00)){
*err = U_TRUNCATED_CHAR_FOUND;
args->converter->toUnicodeStatus = 0x00;
}
/* Reset the state of converter if we consumed
* the source and flush is true
*/
if( (mySource == mySourceLimit) && args->flush){
_HZReset(args->converter, UCNV_RESET_TO_UNICODE);
}
args->target = myTarget;
args->source = mySource;
}
static void
UConverter_fromUnicode_HZ_OFFSETS_LOGIC (UConverterFromUnicodeArgs * args,
UErrorCode * err){
const UChar *mySource = args->source;
unsigned char *myTarget = (unsigned char *) args->target;
int32_t* offsets = args->offsets;
int32_t mySourceIndex = 0;
int32_t myTargetIndex = 0;
int32_t targetLength = args->targetLimit - args->target;
int32_t mySourceLength = args->sourceLimit - args->source;
int32_t length=0;
uint32_t targetUniChar = 0x0000;
UChar32 mySourceChar = 0x0000,c=0x0000;
UConverterDataHZ *myConverterData=(UConverterDataHZ*)args->converter->extraInfo;
UBool isTargetUCharDBCS = (UBool) myConverterData->isTargetUCharDBCS;
UBool oldIsTargetUCharDBCS = isTargetUCharDBCS;
UConverterCallbackReason reason;
UBool isEscapeAppended =FALSE;
int len =0;
const char* escSeq=NULL;
if ((args->converter == NULL) || (args->targetLimit < args->target) || (args->sourceLimit < args->source)){
*err = U_ILLEGAL_ARGUMENT_ERROR;
return;
}
if(args->converter->fromUSurrogateLead!=0 && myTargetIndex < targetLength) {
goto getTrail;
}
/*writing the char to the output stream */
while (mySourceIndex < mySourceLength){
targetUniChar = missingCharMarker;
if (myTargetIndex < targetLength){
c=mySourceChar = (UChar) args->source[mySourceIndex++];
oldIsTargetUCharDBCS = isTargetUCharDBCS;
if(mySourceChar ==UCNV_TILDE){
/*concatEscape(args, &myTargetIndex, &targetLength,"\x7E\x7E",err,2,&mySourceIndex);*/
len = ESC_LEN;
escSeq = TILDE_ESCAPE;
CONCAT_ESCAPE_MACRO(args, myTargetIndex, targetLength, escSeq,err,len,mySourceIndex);
continue;
}
else{
length= _MBCSFromUChar32(myConverterData->gbConverter->sharedData,
mySourceChar,&targetUniChar,args->converter->useFallback);
}
/* only DBCS or SBCS characters are expected*/
/* DB haracters with high bit set to 1 are expected */
if(length > 2 || length==0 ||(((targetUniChar & 0x8080) != 0x8080)&& length==2)){
targetUniChar= missingCharMarker;
}
if (targetUniChar != missingCharMarker){
myConverterData->isTargetUCharDBCS = isTargetUCharDBCS = (UBool)(targetUniChar>0x00FF);
if(oldIsTargetUCharDBCS != isTargetUCharDBCS || !myConverterData->isEscapeAppended ){
/*Shifting from a double byte to single byte mode*/
if(!isTargetUCharDBCS){
len =ESC_LEN;
escSeq = SB_ESCAPE;
CONCAT_ESCAPE_MACRO(args, myTargetIndex, targetLength, escSeq,err,len,mySourceIndex);
myConverterData->isEscapeAppended =isEscapeAppended =TRUE;
}
else{ /* Shifting from a single byte to double byte mode*/
len =ESC_LEN;
escSeq = DB_ESCAPE;
CONCAT_ESCAPE_MACRO(args, myTargetIndex, targetLength, escSeq,err,len,mySourceIndex);
myConverterData->isEscapeAppended =isEscapeAppended =TRUE;
}
}
if(isTargetUCharDBCS){
if( myTargetIndex <targetLength){
args->target[myTargetIndex++] =(char) ((targetUniChar >> 8) -0x80);
if(offsets){
*(offsets++) = mySourceIndex-1;
}
if(myTargetIndex < targetLength){
args->target[myTargetIndex++] =(char) ((targetUniChar & 0x00FF) -0x80);
if(offsets){
*(offsets++) = mySourceIndex-1;
}
}else{
args->converter->charErrorBuffer[args->converter->charErrorBufferLength++] = (char) ((targetUniChar & 0x00FF) -0x80);
*err = U_BUFFER_OVERFLOW_ERROR;
}
}else{
args->converter->charErrorBuffer[args->converter->charErrorBufferLength++] =(char) ((targetUniChar >> 8) -0x80);
args->converter->charErrorBuffer[args->converter->charErrorBufferLength++] = (char) ((targetUniChar & 0x00FF) -0x80);
*err = U_BUFFER_OVERFLOW_ERROR;
}
}else{
if( myTargetIndex <targetLength){
args->target[myTargetIndex++] = (char) (targetUniChar );
if(offsets){
*(offsets++) = mySourceIndex-1;
}
}else{
args->converter->charErrorBuffer[args->converter->charErrorBufferLength++] = (char) targetUniChar;
*err = U_BUFFER_OVERFLOW_ERROR;
}
}
}
else{
/* oops.. the code point is unassingned
* set the error and reason
*/
reason =UCNV_UNASSIGNED;
*err =U_INVALID_CHAR_FOUND;
/*Handle surrogates */
/*check if the char is a First surrogate*/
if(UTF_IS_SURROGATE(mySourceChar)) {
if(UTF_IS_SURROGATE_FIRST(mySourceChar)) {
args->converter->fromUSurrogateLead=(UChar)mySourceChar;
getTrail:
/*look ahead to find the trail surrogate*/
if(mySourceIndex < mySourceLength) {
/* test the following code unit */
UChar trail=(UChar) args->source[mySourceIndex];
if(UTF_IS_SECOND_SURROGATE(trail)) {
++mySourceIndex;
mySourceChar=UTF16_GET_PAIR_VALUE(args->converter->fromUSurrogateLead, trail);
args->converter->fromUSurrogateLead=0x00;
/* there are no surrogates in GB2312*/
*err = U_INVALID_CHAR_FOUND;
reason=UCNV_UNASSIGNED;
/* exit this condition tree */
} else {
/* this is an unmatched lead code unit (1st surrogate) */
/* callback(illegal) */
reason=UCNV_ILLEGAL;
*err=U_ILLEGAL_CHAR_FOUND;
}
} else {
/* no more input */
*err = U_ZERO_ERROR;
break;
}
} else {
/* this is an unmatched trail code unit (2nd surrogate) */
/* callback(illegal) */
reason=UCNV_ILLEGAL;
*err=U_ILLEGAL_CHAR_FOUND;
}
}
{
int32_t saveIndex=0;
int32_t currentOffset = (args->offsets) ? *(offsets-1)+1:0;
char * saveTarget = args->target;
const UChar* saveSource = args->source;
int32_t *saveOffsets = args->offsets;
args->converter->invalidUCharLength = 0;
if(mySourceChar>0xffff){
args->converter->invalidUCharBuffer[args->converter->invalidUCharLength++] =(uint16_t)(((mySourceChar)>>10)+0xd7c0);
args->converter->invalidUCharBuffer[args->converter->invalidUCharLength++] =(uint16_t)(((mySourceChar)&0x3ff)|0xdc00);
}
else{
args->converter->invalidUCharBuffer[args->converter->invalidUCharLength++] =(UChar)mySourceChar;
}
myConverterData->isTargetUCharDBCS = (UBool)isTargetUCharDBCS;
args->target += myTargetIndex;
args->source += mySourceIndex;
args->offsets = args->offsets?offsets:0;
saveIndex = myTargetIndex;
/*copies current values for the ErrorFunctor to update */
/*Calls the ErrorFunctor */
args->converter->fromUCharErrorBehaviour ( args->converter->fromUContext,
args,
args->converter->invalidUCharBuffer,
args->converter->invalidUCharLength,
(UChar32) (mySourceChar),
reason,
err);
/*Update the local Indexes so that the conversion
*can restart at the right points
*/
myTargetIndex = args->target - (char*)myTarget;
mySourceIndex = args->source - mySource;
args->offsets = saveOffsets;
saveIndex = myTargetIndex - saveIndex;
if(args->offsets){
args->offsets = saveOffsets;
while(saveIndex-->0){
*offsets = currentOffset;
offsets++;
}
}
isTargetUCharDBCS=myConverterData->isTargetUCharDBCS;
args->source = saveSource;
args->target = saveTarget;
args->offsets = saveOffsets;
args->converter->fromUSurrogateLead=0x00;
if (U_FAILURE (*err))
break;
}
}
}
else{
*err = U_BUFFER_OVERFLOW_ERROR;
break;
}
targetUniChar=missingCharMarker;
}
/*If at the end of conversion we are still carrying state information
*flush is TRUE, we can deduce that the input stream is truncated
*/
if (args->converter->fromUSurrogateLead !=0 && (mySourceIndex == mySourceLength) && args->flush){
*err = U_TRUNCATED_CHAR_FOUND;
args->converter->toUnicodeStatus = 0x00;
}
/* Reset the state of converter if we consumed
* the source and flush is true
*/
if( (mySourceIndex == mySourceLength) && args->flush){
_HZReset(args->converter, UCNV_RESET_FROM_UNICODE);
}
args->target += myTargetIndex;
args->source += mySourceIndex;
myConverterData->isTargetUCharDBCS = isTargetUCharDBCS;
}
static void
_HZ_WriteSub(UConverterFromUnicodeArgs *args, int32_t offsetIndex, UErrorCode *err) {
UConverter *cnv = args->converter;
UConverterDataHZ *convData=(UConverterDataHZ *) cnv->extraInfo;
char *p;
char buffer[4];
p = buffer;
if( convData->isTargetUCharDBCS){
*p++= UCNV_TILDE;
*p++= UCNV_CLOSE_BRACE;
convData->isTargetUCharDBCS=FALSE;
}
*p++= cnv->subChar[0];
ucnv_cbFromUWriteBytes(args,
buffer, (int32_t)(p - buffer),
offsetIndex, err);
}
/* structure for SafeClone calculations */
struct cloneStruct
{
UConverter cnv;
UConverterDataHZ mydata;
};
static UConverter *
_HZ_SafeClone(const UConverter *cnv,
void *stackBuffer,
int32_t *pBufferSize,
UErrorCode *status)
{
struct cloneStruct * localClone;
int32_t bufferSizeNeeded = sizeof(struct cloneStruct);
if (U_FAILURE(*status)){
return 0;
}
if (*pBufferSize == 0){ /* 'preflighting' request - set needed size into *pBufferSize */
*pBufferSize = bufferSizeNeeded;
return 0;
}
localClone = (struct cloneStruct *)stackBuffer;
uprv_memcpy(&localClone->cnv, cnv, sizeof(UConverter));
localClone->cnv.isCopyLocal = TRUE;
uprv_memcpy(&localClone->mydata, cnv->extraInfo, sizeof(UConverterDataHZ));
localClone->cnv.extraInfo = &localClone->mydata;
return &localClone->cnv;
}
static const UConverterImpl _HZImpl={
UCNV_HZ,
NULL,
NULL,
_HZOpen,
_HZClose,
_HZReset,
UConverter_toUnicode_HZ_OFFSETS_LOGIC,
UConverter_toUnicode_HZ_OFFSETS_LOGIC,
UConverter_fromUnicode_HZ_OFFSETS_LOGIC,
UConverter_fromUnicode_HZ_OFFSETS_LOGIC,
NULL,
NULL,
NULL,
_HZ_WriteSub,
_HZ_SafeClone
};
static const UConverterStaticData _HZStaticData={
sizeof(UConverterStaticData),
"HZ",
0,
UCNV_IBM,
UCNV_HZ,
1,
4,
{ 0x1a, 0, 0, 0 },
1,
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 _HZData={
sizeof(UConverterSharedData),
~((uint32_t) 0),
NULL,
NULL,
&_HZStaticData,
FALSE,
&_HZImpl,
0
};