/*
**********************************************************************
* Copyright (C) 2002-2009, International Business Machines
* Corporation and others. All Rights Reserved.
**********************************************************************
* file name: ucnv_u32.c
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
*
* created on: 2002jul01
* created by: Markus W. Scherer
*
* UTF-32 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"
#include "cmemory.h"
#define MAXIMUM_UCS2 0x0000FFFF
#define MAXIMUM_UTF 0x0010FFFF
#define HALF_SHIFT 10
#define HALF_BASE 0x0010000
#define HALF_MASK 0x3FF
#define SURROGATE_HIGH_START 0xD800
#define SURROGATE_LOW_START 0xDC00
/* -SURROGATE_LOW_START + HALF_BASE */
#define SURROGATE_LOW_BASE 9216
enum {
UCNV_NEED_TO_WRITE_BOM=1
};
/* UTF-32BE ----------------------------------------------------------------- */
static void
T_UConverter_toUnicode_UTF32_BE(UConverterToUnicodeArgs * args,
UErrorCode * err)
{
const unsigned char *mySource = (unsigned char *) args->source;
UChar *myTarget = args->target;
const unsigned char *sourceLimit = (unsigned char *) args->sourceLimit;
const UChar *targetLimit = args->targetLimit;
unsigned char *toUBytes = args->converter->toUBytes;
uint32_t ch, i;
/* Restore state of current sequence */
if (args->converter->toUnicodeStatus && myTarget < targetLimit) {
i = args->converter->toULength; /* restore # of bytes consumed */
args->converter->toULength = 0;
ch = args->converter->toUnicodeStatus - 1;/*Stores the previously calculated ch from a previous call*/
args->converter->toUnicodeStatus = 0;
goto morebytes;
}
while (mySource < sourceLimit && myTarget < targetLimit) {
i = 0;
ch = 0;
morebytes:
while (i < sizeof(uint32_t)) {
if (mySource < sourceLimit) {
ch = (ch << 8) | (uint8_t)(*mySource);
toUBytes[i++] = (char) *(mySource++);
}
else {
/* stores a partially calculated target*/
/* + 1 to make 0 a valid character */
args->converter->toUnicodeStatus = ch + 1;
args->converter->toULength = (int8_t) i;
goto donefornow;
}
}
if (ch <= MAXIMUM_UTF && !U_IS_SURROGATE(ch)) {
/* Normal valid byte when the loop has not prematurely terminated (i < inBytes) */
if (ch <= MAXIMUM_UCS2)
{
/* fits in 16 bits */
*(myTarget++) = (UChar) ch;
}
else {
/* write out the surrogates */
*(myTarget++) = U16_LEAD(ch);
ch = U16_TRAIL(ch);
if (myTarget < targetLimit) {
*(myTarget++) = (UChar)ch;
}
else {
/* Put in overflow buffer (not handled here) */
args->converter->UCharErrorBuffer[0] = (UChar) ch;
args->converter->UCharErrorBufferLength = 1;
*err = U_BUFFER_OVERFLOW_ERROR;
break;
}
}
}
else {
args->converter->toULength = (int8_t)i;
*err = U_ILLEGAL_CHAR_FOUND;
break;
}
}
donefornow:
if (mySource < sourceLimit && myTarget >= targetLimit && U_SUCCESS(*err)) {
/* End of target buffer */
*err = U_BUFFER_OVERFLOW_ERROR;
}
args->target = myTarget;
args->source = (const char *) mySource;
}
static void
T_UConverter_toUnicode_UTF32_BE_OFFSET_LOGIC(UConverterToUnicodeArgs * args,
UErrorCode * err)
{
const unsigned char *mySource = (unsigned char *) args->source;
UChar *myTarget = args->target;
int32_t *myOffsets = args->offsets;
const unsigned char *sourceLimit = (unsigned char *) args->sourceLimit;
const UChar *targetLimit = args->targetLimit;
unsigned char *toUBytes = args->converter->toUBytes;
uint32_t ch, i;
int32_t offsetNum = 0;
/* Restore state of current sequence */
if (args->converter->toUnicodeStatus && myTarget < targetLimit) {
i = args->converter->toULength; /* restore # of bytes consumed */
args->converter->toULength = 0;
ch = args->converter->toUnicodeStatus - 1;/*Stores the previously calculated ch from a previous call*/
args->converter->toUnicodeStatus = 0;
goto morebytes;
}
while (mySource < sourceLimit && myTarget < targetLimit) {
i = 0;
ch = 0;
morebytes:
while (i < sizeof(uint32_t)) {
if (mySource < sourceLimit) {
ch = (ch << 8) | (uint8_t)(*mySource);
toUBytes[i++] = (char) *(mySource++);
}
else {
/* stores a partially calculated target*/
/* + 1 to make 0 a valid character */
args->converter->toUnicodeStatus = ch + 1;
args->converter->toULength = (int8_t) i;
goto donefornow;
}
}
if (ch <= MAXIMUM_UTF && !U_IS_SURROGATE(ch)) {
/* Normal valid byte when the loop has not prematurely terminated (i < inBytes) */
if (ch <= MAXIMUM_UCS2) {
/* fits in 16 bits */
*(myTarget++) = (UChar) ch;
*(myOffsets++) = offsetNum;
}
else {
/* write out the surrogates */
*(myTarget++) = U16_LEAD(ch);
*myOffsets++ = offsetNum;
ch = U16_TRAIL(ch);
if (myTarget < targetLimit)
{
*(myTarget++) = (UChar)ch;
*(myOffsets++) = offsetNum;
}
else {
/* Put in overflow buffer (not handled here) */
args->converter->UCharErrorBuffer[0] = (UChar) ch;
args->converter->UCharErrorBufferLength = 1;
*err = U_BUFFER_OVERFLOW_ERROR;
break;
}
}
}
else {
args->converter->toULength = (int8_t)i;
*err = U_ILLEGAL_CHAR_FOUND;
break;
}
offsetNum += i;
}
donefornow:
if (mySource < sourceLimit && myTarget >= targetLimit && U_SUCCESS(*err))
{
/* End of target buffer */
*err = U_BUFFER_OVERFLOW_ERROR;
}
args->target = myTarget;
args->source = (const char *) mySource;
args->offsets = myOffsets;
}
static void
T_UConverter_fromUnicode_UTF32_BE(UConverterFromUnicodeArgs * args,
UErrorCode * err)
{
const UChar *mySource = args->source;
unsigned char *myTarget;
const UChar *sourceLimit = args->sourceLimit;
const unsigned char *targetLimit = (unsigned char *) args->targetLimit;
UChar32 ch, ch2;
unsigned int indexToWrite;
unsigned char temp[sizeof(uint32_t)];
if(mySource >= sourceLimit) {
/* no input, nothing to do */
return;
}
/* write the BOM if necessary */
if(args->converter->fromUnicodeStatus==UCNV_NEED_TO_WRITE_BOM) {
static const char bom[]={ 0, 0, (char)0xfe, (char)0xff };
ucnv_fromUWriteBytes(args->converter,
bom, 4,
&args->target, args->targetLimit,
&args->offsets, -1,
err);
args->converter->fromUnicodeStatus=0;
}
myTarget = (unsigned char *) args->target;
temp[0] = 0;
if (args->converter->fromUChar32) {
ch = args->converter->fromUChar32;
args->converter->fromUChar32 = 0;
goto lowsurogate;
}
while (mySource < sourceLimit && myTarget < targetLimit) {
ch = *(mySource++);
if (UTF_IS_SURROGATE(ch)) {
if (U_IS_LEAD(ch)) {
lowsurogate:
if (mySource < sourceLimit) {
ch2 = *mySource;
if (U_IS_TRAIL(ch2)) {
ch = ((ch - SURROGATE_HIGH_START) << HALF_SHIFT) + ch2 + SURROGATE_LOW_BASE;
mySource++;
}
else {
/* this is an unmatched trail code unit (2nd surrogate) */
/* callback(illegal) */
args->converter->fromUChar32 = ch;
*err = U_ILLEGAL_CHAR_FOUND;
break;
}
}
else {
/* ran out of source */
args->converter->fromUChar32 = ch;
if (args->flush) {
/* this is an unmatched trail code unit (2nd surrogate) */
/* callback(illegal) */
*err = U_ILLEGAL_CHAR_FOUND;
}
break;
}
}
else {
/* this is an unmatched trail code unit (2nd surrogate) */
/* callback(illegal) */
args->converter->fromUChar32 = ch;
*err = U_ILLEGAL_CHAR_FOUND;
break;
}
}
/* We cannot get any larger than 10FFFF because we are coming from UTF-16 */
temp[1] = (uint8_t) (ch >> 16 & 0x1F);
temp[2] = (uint8_t) (ch >> 8); /* unsigned cast implicitly does (ch & FF) */
temp[3] = (uint8_t) (ch); /* unsigned cast implicitly does (ch & FF) */
for (indexToWrite = 0; indexToWrite <= sizeof(uint32_t) - 1; indexToWrite++) {
if (myTarget < targetLimit) {
*(myTarget++) = temp[indexToWrite];
}
else {
args->converter->charErrorBuffer[args->converter->charErrorBufferLength++] = temp[indexToWrite];
*err = U_BUFFER_OVERFLOW_ERROR;
}
}
}
if (mySource < sourceLimit && myTarget >= targetLimit && U_SUCCESS(*err)) {
*err = U_BUFFER_OVERFLOW_ERROR;
}
args->target = (char *) myTarget;
args->source = mySource;
}
static void
T_UConverter_fromUnicode_UTF32_BE_OFFSET_LOGIC(UConverterFromUnicodeArgs * args,
UErrorCode * err)
{
const UChar *mySource = args->source;
unsigned char *myTarget;
int32_t *myOffsets;
const UChar *sourceLimit = args->sourceLimit;
const unsigned char *targetLimit = (unsigned char *) args->targetLimit;
UChar32 ch, ch2;
int32_t offsetNum = 0;
unsigned int indexToWrite;
unsigned char temp[sizeof(uint32_t)];
if(mySource >= sourceLimit) {
/* no input, nothing to do */
return;
}
/* write the BOM if necessary */
if(args->converter->fromUnicodeStatus==UCNV_NEED_TO_WRITE_BOM) {
static const char bom[]={ 0, 0, (char)0xfe, (char)0xff };
ucnv_fromUWriteBytes(args->converter,
bom, 4,
&args->target, args->targetLimit,
&args->offsets, -1,
err);
args->converter->fromUnicodeStatus=0;
}
myTarget = (unsigned char *) args->target;
myOffsets = args->offsets;
temp[0] = 0;
if (args->converter->fromUChar32) {
ch = args->converter->fromUChar32;
args->converter->fromUChar32 = 0;
goto lowsurogate;
}
while (mySource < sourceLimit && myTarget < targetLimit) {
ch = *(mySource++);
if (UTF_IS_SURROGATE(ch)) {
if (U_IS_LEAD(ch)) {
lowsurogate:
if (mySource < sourceLimit) {
ch2 = *mySource;
if (U_IS_TRAIL(ch2)) {
ch = ((ch - SURROGATE_HIGH_START) << HALF_SHIFT) + ch2 + SURROGATE_LOW_BASE;
mySource++;
}
else {
/* this is an unmatched trail code unit (2nd surrogate) */
/* callback(illegal) */
args->converter->fromUChar32 = ch;
*err = U_ILLEGAL_CHAR_FOUND;
break;
}
}
else {
/* ran out of source */
args->converter->fromUChar32 = ch;
if (args->flush) {
/* this is an unmatched trail code unit (2nd surrogate) */
/* callback(illegal) */
*err = U_ILLEGAL_CHAR_FOUND;
}
break;
}
}
else {
/* this is an unmatched trail code unit (2nd surrogate) */
/* callback(illegal) */
args->converter->fromUChar32 = ch;
*err = U_ILLEGAL_CHAR_FOUND;
break;
}
}
/* We cannot get any larger than 10FFFF because we are coming from UTF-16 */
temp[1] = (uint8_t) (ch >> 16 & 0x1F);
temp[2] = (uint8_t) (ch >> 8); /* unsigned cast implicitly does (ch & FF) */
temp[3] = (uint8_t) (ch); /* unsigned cast implicitly does (ch & FF) */
for (indexToWrite = 0; indexToWrite <= sizeof(uint32_t) - 1; indexToWrite++) {
if (myTarget < targetLimit) {
*(myTarget++) = temp[indexToWrite];
*(myOffsets++) = offsetNum;
}
else {
args->converter->charErrorBuffer[args->converter->charErrorBufferLength++] = temp[indexToWrite];
*err = U_BUFFER_OVERFLOW_ERROR;
}
}
offsetNum = offsetNum + 1 + (temp[1] != 0);
}
if (mySource < sourceLimit && myTarget >= targetLimit && U_SUCCESS(*err)) {
*err = U_BUFFER_OVERFLOW_ERROR;
}
args->target = (char *) myTarget;
args->source = mySource;
args->offsets = myOffsets;
}
static UChar32
T_UConverter_getNextUChar_UTF32_BE(UConverterToUnicodeArgs* args,
UErrorCode* err)
{
const uint8_t *mySource;
UChar32 myUChar;
int32_t length;
mySource = (const uint8_t *)args->source;
if (mySource >= (const uint8_t *)args->sourceLimit)
{
/* no input */
*err = U_INDEX_OUTOFBOUNDS_ERROR;
return 0xffff;
}
length = (int32_t)((const uint8_t *)args->sourceLimit - mySource);
if (length < 4)
{
/* got a partial character */
uprv_memcpy(args->converter->toUBytes, mySource, length);
args->converter->toULength = (int8_t)length;
args->source = (const char *)(mySource + length);
*err = U_TRUNCATED_CHAR_FOUND;
return 0xffff;
}
/* Don't even try to do a direct cast because the value may be on an odd address. */
myUChar = ((UChar32)mySource[0] << 24)
| ((UChar32)mySource[1] << 16)
| ((UChar32)mySource[2] << 8)
| ((UChar32)mySource[3]);
args->source = (const char *)(mySource + 4);
if ((uint32_t)myUChar <= MAXIMUM_UTF && !U_IS_SURROGATE(myUChar)) {
return myUChar;
}
uprv_memcpy(args->converter->toUBytes, mySource, 4);
args->converter->toULength = 4;
*err = U_ILLEGAL_CHAR_FOUND;
return 0xffff;
}
static const UConverterImpl _UTF32BEImpl = {
UCNV_UTF32_BigEndian,
NULL,
NULL,
NULL,
NULL,
NULL,
T_UConverter_toUnicode_UTF32_BE,
T_UConverter_toUnicode_UTF32_BE_OFFSET_LOGIC,
T_UConverter_fromUnicode_UTF32_BE,
T_UConverter_fromUnicode_UTF32_BE_OFFSET_LOGIC,
T_UConverter_getNextUChar_UTF32_BE,
NULL,
NULL,
NULL,
NULL,
ucnv_getNonSurrogateUnicodeSet
};
/* The 1232 CCSID refers to any version of Unicode with any endianess of UTF-32 */
static const UConverterStaticData _UTF32BEStaticData = {
sizeof(UConverterStaticData),
"UTF-32BE",
1232,
UCNV_IBM, UCNV_UTF32_BigEndian, 4, 4,
{ 0, 0, 0xff, 0xfd }, 4, 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 _UTF32BEData = {
sizeof(UConverterSharedData), ~((uint32_t) 0),
NULL, NULL, &_UTF32BEStaticData, FALSE, &_UTF32BEImpl,
0
};
/* UTF-32LE ---------------------------------------------------------- */
static void
T_UConverter_toUnicode_UTF32_LE(UConverterToUnicodeArgs * args,
UErrorCode * err)
{
const unsigned char *mySource = (unsigned char *) args->source;
UChar *myTarget = args->target;
const unsigned char *sourceLimit = (unsigned char *) args->sourceLimit;
const UChar *targetLimit = args->targetLimit;
unsigned char *toUBytes = args->converter->toUBytes;
uint32_t ch, i;
/* Restore state of current sequence */
if (args->converter->toUnicodeStatus && myTarget < targetLimit)
{
i = args->converter->toULength; /* restore # of bytes consumed */
args->converter->toULength = 0;
/* Stores the previously calculated ch from a previous call*/
ch = args->converter->toUnicodeStatus - 1;
args->converter->toUnicodeStatus = 0;
goto morebytes;
}
while (mySource < sourceLimit && myTarget < targetLimit)
{
i = 0;
ch = 0;
morebytes:
while (i < sizeof(uint32_t))
{
if (mySource < sourceLimit)
{
ch |= ((uint8_t)(*mySource)) << (i * 8);
toUBytes[i++] = (char) *(mySource++);
}
else
{
/* stores a partially calculated target*/
/* + 1 to make 0 a valid character */
args->converter->toUnicodeStatus = ch + 1;
args->converter->toULength = (int8_t) i;
goto donefornow;
}
}
if (ch <= MAXIMUM_UTF && !U_IS_SURROGATE(ch)) {
/* Normal valid byte when the loop has not prematurely terminated (i < inBytes) */
if (ch <= MAXIMUM_UCS2) {
/* fits in 16 bits */
*(myTarget++) = (UChar) ch;
}
else {
/* write out the surrogates */
*(myTarget++) = U16_LEAD(ch);
ch = U16_TRAIL(ch);
if (myTarget < targetLimit) {
*(myTarget++) = (UChar)ch;
}
else {
/* Put in overflow buffer (not handled here) */
args->converter->UCharErrorBuffer[0] = (UChar) ch;
args->converter->UCharErrorBufferLength = 1;
*err = U_BUFFER_OVERFLOW_ERROR;
break;
}
}
}
else {
args->converter->toULength = (int8_t)i;
*err = U_ILLEGAL_CHAR_FOUND;
break;
}
}
donefornow:
if (mySource < sourceLimit && myTarget >= targetLimit && U_SUCCESS(*err))
{
/* End of target buffer */
*err = U_BUFFER_OVERFLOW_ERROR;
}
args->target = myTarget;
args->source = (const char *) mySource;
}
static void
T_UConverter_toUnicode_UTF32_LE_OFFSET_LOGIC(UConverterToUnicodeArgs * args,
UErrorCode * err)
{
const unsigned char *mySource = (unsigned char *) args->source;
UChar *myTarget = args->target;
int32_t *myOffsets = args->offsets;
const unsigned char *sourceLimit = (unsigned char *) args->sourceLimit;
const UChar *targetLimit = args->targetLimit;
unsigned char *toUBytes = args->converter->toUBytes;
uint32_t ch, i;
int32_t offsetNum = 0;
/* Restore state of current sequence */
if (args->converter->toUnicodeStatus && myTarget < targetLimit)
{
i = args->converter->toULength; /* restore # of bytes consumed */
args->converter->toULength = 0;
/* Stores the previously calculated ch from a previous call*/
ch = args->converter->toUnicodeStatus - 1;
args->converter->toUnicodeStatus = 0;
goto morebytes;
}
while (mySource < sourceLimit && myTarget < targetLimit)
{
i = 0;
ch = 0;
morebytes:
while (i < sizeof(uint32_t))
{
if (mySource < sourceLimit)
{
ch |= ((uint8_t)(*mySource)) << (i * 8);
toUBytes[i++] = (char) *(mySource++);
}
else
{
/* stores a partially calculated target*/
/* + 1 to make 0 a valid character */
args->converter->toUnicodeStatus = ch + 1;
args->converter->toULength = (int8_t) i;
goto donefornow;
}
}
if (ch <= MAXIMUM_UTF && !U_IS_SURROGATE(ch))
{
/* Normal valid byte when the loop has not prematurely terminated (i < inBytes) */
if (ch <= MAXIMUM_UCS2)
{
/* fits in 16 bits */
*(myTarget++) = (UChar) ch;
*(myOffsets++) = offsetNum;
}
else {
/* write out the surrogates */
*(myTarget++) = U16_LEAD(ch);
*(myOffsets++) = offsetNum;
ch = U16_TRAIL(ch);
if (myTarget < targetLimit)
{
*(myTarget++) = (UChar)ch;
*(myOffsets++) = offsetNum;
}
else
{
/* Put in overflow buffer (not handled here) */
args->converter->UCharErrorBuffer[0] = (UChar) ch;
args->converter->UCharErrorBufferLength = 1;
*err = U_BUFFER_OVERFLOW_ERROR;
break;
}
}
}
else
{
args->converter->toULength = (int8_t)i;
*err = U_ILLEGAL_CHAR_FOUND;
break;
}
offsetNum += i;
}
donefornow:
if (mySource < sourceLimit && myTarget >= targetLimit && U_SUCCESS(*err))
{
/* End of target buffer */
*err = U_BUFFER_OVERFLOW_ERROR;
}
args->target = myTarget;
args->source = (const char *) mySource;
args->offsets = myOffsets;
}
static void
T_UConverter_fromUnicode_UTF32_LE(UConverterFromUnicodeArgs * args,
UErrorCode * err)
{
const UChar *mySource = args->source;
unsigned char *myTarget;
const UChar *sourceLimit = args->sourceLimit;
const unsigned char *targetLimit = (unsigned char *) args->targetLimit;
UChar32 ch, ch2;
unsigned int indexToWrite;
unsigned char temp[sizeof(uint32_t)];
if(mySource >= sourceLimit) {
/* no input, nothing to do */
return;
}
/* write the BOM if necessary */
if(args->converter->fromUnicodeStatus==UCNV_NEED_TO_WRITE_BOM) {
static const char bom[]={ (char)0xff, (char)0xfe, 0, 0 };
ucnv_fromUWriteBytes(args->converter,
bom, 4,
&args->target, args->targetLimit,
&args->offsets, -1,
err);
args->converter->fromUnicodeStatus=0;
}
myTarget = (unsigned char *) args->target;
temp[3] = 0;
if (args->converter->fromUChar32)
{
ch = args->converter->fromUChar32;
args->converter->fromUChar32 = 0;
goto lowsurogate;
}
while (mySource < sourceLimit && myTarget < targetLimit)
{
ch = *(mySource++);
if (UTF_IS_SURROGATE(ch)) {
if (U_IS_LEAD(ch))
{
lowsurogate:
if (mySource < sourceLimit)
{
ch2 = *mySource;
if (U_IS_TRAIL(ch2)) {
ch = ((ch - SURROGATE_HIGH_START) << HALF_SHIFT) + ch2 + SURROGATE_LOW_BASE;
mySource++;
}
else {
/* this is an unmatched trail code unit (2nd surrogate) */
/* callback(illegal) */
args->converter->fromUChar32 = ch;
*err = U_ILLEGAL_CHAR_FOUND;
break;
}
}
else {
/* ran out of source */
args->converter->fromUChar32 = ch;
if (args->flush) {
/* this is an unmatched trail code unit (2nd surrogate) */
/* callback(illegal) */
*err = U_ILLEGAL_CHAR_FOUND;
}
break;
}
}
else {
/* this is an unmatched trail code unit (2nd surrogate) */
/* callback(illegal) */
args->converter->fromUChar32 = ch;
*err = U_ILLEGAL_CHAR_FOUND;
break;
}
}
/* We cannot get any larger than 10FFFF because we are coming from UTF-16 */
temp[2] = (uint8_t) (ch >> 16 & 0x1F);
temp[1] = (uint8_t) (ch >> 8); /* unsigned cast implicitly does (ch & FF) */
temp[0] = (uint8_t) (ch); /* unsigned cast implicitly does (ch & FF) */
for (indexToWrite = 0; indexToWrite <= sizeof(uint32_t) - 1; indexToWrite++)
{
if (myTarget < targetLimit)
{
*(myTarget++) = temp[indexToWrite];
}
else
{
args->converter->charErrorBuffer[args->converter->charErrorBufferLength++] = temp[indexToWrite];
*err = U_BUFFER_OVERFLOW_ERROR;
}
}
}
if (mySource < sourceLimit && myTarget >= targetLimit && U_SUCCESS(*err))
{
*err = U_BUFFER_OVERFLOW_ERROR;
}
args->target = (char *) myTarget;
args->source = mySource;
}
static void
T_UConverter_fromUnicode_UTF32_LE_OFFSET_LOGIC(UConverterFromUnicodeArgs * args,
UErrorCode * err)
{
const UChar *mySource = args->source;
unsigned char *myTarget;
int32_t *myOffsets;
const UChar *sourceLimit = args->sourceLimit;
const unsigned char *targetLimit = (unsigned char *) args->targetLimit;
UChar32 ch, ch2;
unsigned int indexToWrite;
unsigned char temp[sizeof(uint32_t)];
int32_t offsetNum = 0;
if(mySource >= sourceLimit) {
/* no input, nothing to do */
return;
}
/* write the BOM if necessary */
if(args->converter->fromUnicodeStatus==UCNV_NEED_TO_WRITE_BOM) {
static const char bom[]={ (char)0xff, (char)0xfe, 0, 0 };
ucnv_fromUWriteBytes(args->converter,
bom, 4,
&args->target, args->targetLimit,
&args->offsets, -1,
err);
args->converter->fromUnicodeStatus=0;
}
myTarget = (unsigned char *) args->target;
myOffsets = args->offsets;
temp[3] = 0;
if (args->converter->fromUChar32)
{
ch = args->converter->fromUChar32;
args->converter->fromUChar32 = 0;
goto lowsurogate;
}
while (mySource < sourceLimit && myTarget < targetLimit)
{
ch = *(mySource++);
if (UTF_IS_SURROGATE(ch)) {
if (U_IS_LEAD(ch))
{
lowsurogate:
if (mySource < sourceLimit)
{
ch2 = *mySource;
if (U_IS_TRAIL(ch2))
{
ch = ((ch - SURROGATE_HIGH_START) << HALF_SHIFT) + ch2 + SURROGATE_LOW_BASE;
mySource++;
}
else {
/* this is an unmatched trail code unit (2nd surrogate) */
/* callback(illegal) */
args->converter->fromUChar32 = ch;
*err = U_ILLEGAL_CHAR_FOUND;
break;
}
}
else {
/* ran out of source */
args->converter->fromUChar32 = ch;
if (args->flush) {
/* this is an unmatched trail code unit (2nd surrogate) */
/* callback(illegal) */
*err = U_ILLEGAL_CHAR_FOUND;
}
break;
}
}
else {
/* this is an unmatched trail code unit (2nd surrogate) */
/* callback(illegal) */
args->converter->fromUChar32 = ch;
*err = U_ILLEGAL_CHAR_FOUND;
break;
}
}
/* We cannot get any larger than 10FFFF because we are coming from UTF-16 */
temp[2] = (uint8_t) (ch >> 16 & 0x1F);
temp[1] = (uint8_t) (ch >> 8); /* unsigned cast implicitly does (ch & FF) */
temp[0] = (uint8_t) (ch); /* unsigned cast implicitly does (ch & FF) */
for (indexToWrite = 0; indexToWrite <= sizeof(uint32_t) - 1; indexToWrite++)
{
if (myTarget < targetLimit)
{
*(myTarget++) = temp[indexToWrite];
*(myOffsets++) = offsetNum;
}
else
{
args->converter->charErrorBuffer[args->converter->charErrorBufferLength++] = temp[indexToWrite];
*err = U_BUFFER_OVERFLOW_ERROR;
}
}
offsetNum = offsetNum + 1 + (temp[2] != 0);
}
if (mySource < sourceLimit && myTarget >= targetLimit && U_SUCCESS(*err))
{
*err = U_BUFFER_OVERFLOW_ERROR;
}
args->target = (char *) myTarget;
args->source = mySource;
args->offsets = myOffsets;
}
static UChar32
T_UConverter_getNextUChar_UTF32_LE(UConverterToUnicodeArgs* args,
UErrorCode* err)
{
const uint8_t *mySource;
UChar32 myUChar;
int32_t length;
mySource = (const uint8_t *)args->source;
if (mySource >= (const uint8_t *)args->sourceLimit)
{
/* no input */
*err = U_INDEX_OUTOFBOUNDS_ERROR;
return 0xffff;
}
length = (int32_t)((const uint8_t *)args->sourceLimit - mySource);
if (length < 4)
{
/* got a partial character */
uprv_memcpy(args->converter->toUBytes, mySource, length);
args->converter->toULength = (int8_t)length;
args->source = (const char *)(mySource + length);
*err = U_TRUNCATED_CHAR_FOUND;
return 0xffff;
}
/* Don't even try to do a direct cast because the value may be on an odd address. */
myUChar = ((UChar32)mySource[3] << 24)
| ((UChar32)mySource[2] << 16)
| ((UChar32)mySource[1] << 8)
| ((UChar32)mySource[0]);
args->source = (const char *)(mySource + 4);
if ((uint32_t)myUChar <= MAXIMUM_UTF && !U_IS_SURROGATE(myUChar)) {
return myUChar;
}
uprv_memcpy(args->converter->toUBytes, mySource, 4);
args->converter->toULength = 4;
*err = U_ILLEGAL_CHAR_FOUND;
return 0xffff;
}
static const UConverterImpl _UTF32LEImpl = {
UCNV_UTF32_LittleEndian,
NULL,
NULL,
NULL,
NULL,
NULL,
T_UConverter_toUnicode_UTF32_LE,
T_UConverter_toUnicode_UTF32_LE_OFFSET_LOGIC,
T_UConverter_fromUnicode_UTF32_LE,
T_UConverter_fromUnicode_UTF32_LE_OFFSET_LOGIC,
T_UConverter_getNextUChar_UTF32_LE,
NULL,
NULL,
NULL,
NULL,
ucnv_getNonSurrogateUnicodeSet
};
/* The 1232 CCSID refers to any version of Unicode with any endianess of UTF-32 */
static const UConverterStaticData _UTF32LEStaticData = {
sizeof(UConverterStaticData),
"UTF-32LE",
1234,
UCNV_IBM, UCNV_UTF32_LittleEndian, 4, 4,
{ 0xfd, 0xff, 0, 0 }, 4, 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 _UTF32LEData = {
sizeof(UConverterSharedData), ~((uint32_t) 0),
NULL, NULL, &_UTF32LEStaticData, FALSE, &_UTF32LEImpl,
0
};
/* UTF-32 (Detect BOM) ------------------------------------------------------ */
/*
* Detect a BOM at the beginning of the stream and select UTF-32BE or UTF-32LE
* accordingly.
*
* State values:
* 0 initial state
* 1 saw 00
* 2 saw 00 00
* 3 saw 00 00 FE
* 4 -
* 5 saw FF
* 6 saw FF FE
* 7 saw FF FE 00
* 8 UTF-32BE mode
* 9 UTF-32LE mode
*
* During detection: state&3==number of matching bytes so far.
*
* On output, emit U+FEFF as the first code point.
*/
static void
_UTF32Reset(UConverter *cnv, UConverterResetChoice choice) {
if(choice<=UCNV_RESET_TO_UNICODE) {
/* reset toUnicode: state=0 */
cnv->mode=0;
}
if(choice!=UCNV_RESET_TO_UNICODE) {
/* reset fromUnicode: prepare to output the UTF-32PE BOM */
cnv->fromUnicodeStatus=UCNV_NEED_TO_WRITE_BOM;
}
}
static void
_UTF32Open(UConverter *cnv,
UConverterLoadArgs *pArgs,
UErrorCode *pErrorCode) {
_UTF32Reset(cnv, UCNV_RESET_BOTH);
}
static const char utf32BOM[8]={ 0, 0, (char)0xfe, (char)0xff, (char)0xff, (char)0xfe, 0, 0 };
static void
_UTF32ToUnicodeWithOffsets(UConverterToUnicodeArgs *pArgs,
UErrorCode *pErrorCode) {
UConverter *cnv=pArgs->converter;
const char *source=pArgs->source;
const char *sourceLimit=pArgs->sourceLimit;
int32_t *offsets=pArgs->offsets;
int32_t state, offsetDelta;
char b;
state=cnv->mode;
/*
* If we detect a BOM in this buffer, then we must add the BOM size to the
* offsets because the actual converter function will not see and count the BOM.
* offsetDelta will have the number of the BOM bytes that are in the current buffer.
*/
offsetDelta=0;
while(source<sourceLimit && U_SUCCESS(*pErrorCode)) {
switch(state) {
case 0:
b=*source;
if(b==0) {
state=1; /* could be 00 00 FE FF */
} else if(b==(char)0xff) {
state=5; /* could be FF FE 00 00 */
} else {
state=8; /* default to UTF-32BE */
continue;
}
++source;
break;
case 1:
case 2:
case 3:
case 5:
case 6:
case 7:
if(*source==utf32BOM[state]) {
++state;
++source;
if(state==4) {
state=8; /* detect UTF-32BE */
offsetDelta=(int32_t)(source-pArgs->source);
} else if(state==8) {
state=9; /* detect UTF-32LE */
offsetDelta=(int32_t)(source-pArgs->source);
}
} else {
/* switch to UTF-32BE and pass the previous bytes */
int32_t count=(int32_t)(source-pArgs->source); /* number of bytes from this buffer */
/* reset the source */
source=pArgs->source;
if(count==(state&3)) {
/* simple: all in the same buffer, just reset source */
} else {
UBool oldFlush=pArgs->flush;
/* some of the bytes are from a previous buffer, replay those first */
pArgs->source=utf32BOM+(state&4); /* select the correct BOM */
pArgs->sourceLimit=pArgs->source+((state&3)-count); /* replay previous bytes */
pArgs->flush=FALSE; /* this sourceLimit is not the real source stream limit */
/* no offsets: bytes from previous buffer, and not enough for output */
T_UConverter_toUnicode_UTF32_BE(pArgs, pErrorCode);
/* restore real pointers; pArgs->source will be set in case 8/9 */
pArgs->sourceLimit=sourceLimit;
pArgs->flush=oldFlush;
}
state=8;
continue;
}
break;
case 8:
/* call UTF-32BE */
pArgs->source=source;
if(offsets==NULL) {
T_UConverter_toUnicode_UTF32_BE(pArgs, pErrorCode);
} else {
T_UConverter_toUnicode_UTF32_BE_OFFSET_LOGIC(pArgs, pErrorCode);
}
source=pArgs->source;
break;
case 9:
/* call UTF-32LE */
pArgs->source=source;
if(offsets==NULL) {
T_UConverter_toUnicode_UTF32_LE(pArgs, pErrorCode);
} else {
T_UConverter_toUnicode_UTF32_LE_OFFSET_LOGIC(pArgs, pErrorCode);
}
source=pArgs->source;
break;
default:
break; /* does not occur */
}
}
/* add BOM size to offsets - see comment at offsetDelta declaration */
if(offsets!=NULL && offsetDelta!=0) {
int32_t *offsetsLimit=pArgs->offsets;
while(offsets<offsetsLimit) {
*offsets++ += offsetDelta;
}
}
pArgs->source=source;
if(source==sourceLimit && pArgs->flush) {
/* handle truncated input */
switch(state) {
case 0:
break; /* no input at all, nothing to do */
case 8:
T_UConverter_toUnicode_UTF32_BE(pArgs, pErrorCode);
break;
case 9:
T_UConverter_toUnicode_UTF32_LE(pArgs, pErrorCode);
break;
default:
/* handle 0<state<8: call UTF-32BE with too-short input */
pArgs->source=utf32BOM+(state&4); /* select the correct BOM */
pArgs->sourceLimit=pArgs->source+(state&3); /* replay bytes */
/* no offsets: not enough for output */
T_UConverter_toUnicode_UTF32_BE(pArgs, pErrorCode);
pArgs->source=source;
pArgs->sourceLimit=sourceLimit;
state=8;
break;
}
}
cnv->mode=state;
}
static UChar32
_UTF32GetNextUChar(UConverterToUnicodeArgs *pArgs,
UErrorCode *pErrorCode) {
switch(pArgs->converter->mode) {
case 8:
return T_UConverter_getNextUChar_UTF32_BE(pArgs, pErrorCode);
case 9:
return T_UConverter_getNextUChar_UTF32_LE(pArgs, pErrorCode);
default:
return UCNV_GET_NEXT_UCHAR_USE_TO_U;
}
}
static const UConverterImpl _UTF32Impl = {
UCNV_UTF32,
NULL,
NULL,
_UTF32Open,
NULL,
_UTF32Reset,
_UTF32ToUnicodeWithOffsets,
_UTF32ToUnicodeWithOffsets,
#if U_IS_BIG_ENDIAN
T_UConverter_fromUnicode_UTF32_BE,
T_UConverter_fromUnicode_UTF32_BE_OFFSET_LOGIC,
#else
T_UConverter_fromUnicode_UTF32_LE,
T_UConverter_fromUnicode_UTF32_LE_OFFSET_LOGIC,
#endif
_UTF32GetNextUChar,
NULL, /* ### TODO implement getStarters for all Unicode encodings?! */
NULL,
NULL,
NULL,
ucnv_getNonSurrogateUnicodeSet
};
/* The 1236 CCSID refers to any version of Unicode with a BOM sensitive endianess of UTF-32 */
static const UConverterStaticData _UTF32StaticData = {
sizeof(UConverterStaticData),
"UTF-32",
1236,
UCNV_IBM, UCNV_UTF32, 4, 4,
#if U_IS_BIG_ENDIAN
{ 0, 0, 0xff, 0xfd }, 4,
#else
{ 0xfd, 0xff, 0, 0 }, 4,
#endif
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 _UTF32Data = {
sizeof(UConverterSharedData), ~((uint32_t) 0),
NULL, NULL, &_UTF32StaticData, FALSE, &_UTF32Impl,
0
};
#endif