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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "unicpriv.h"
#include "nsUnicodeDecodeHelper.h"
#include "mozilla/UniquePtr.h"
//----------------------------------------------------------------------
// Class nsUnicodeDecodeHelper [implementation]
nsresult nsUnicodeDecodeHelper::ConvertByTable(
const char * aSrc,
int32_t * aSrcLength,
char16_t * aDest,
int32_t * aDestLength,
uScanClassID aScanClass,
uShiftInTable * aShiftInTable,
uMappingTable * aMappingTable,
bool aErrorSignal)
{
const char * src = aSrc;
int32_t srcLen = *aSrcLength;
char16_t * dest = aDest;
char16_t * destEnd = aDest + *aDestLength;
char16_t med;
int32_t bcr; // byte count for read
nsresult res = NS_OK;
while ((srcLen > 0) && (dest < destEnd)) {
bool charFound;
if (aScanClass == uMultibytesCharset) {
NS_ASSERTION(aShiftInTable, "shift table missing");
charFound = uScanShift(aShiftInTable, nullptr, (uint8_t *)src,
reinterpret_cast<uint16_t*>(&med), srcLen,
(uint32_t *)&bcr);
} else {
charFound = uScan(aScanClass, nullptr, (uint8_t *)src,
reinterpret_cast<uint16_t*>(&med),
srcLen, (uint32_t *)&bcr);
}
if (!charFound) {
res = NS_OK_UDEC_MOREINPUT;
break;
}
if (!uMapCode((uTable*) aMappingTable, static_cast<uint16_t>(med), reinterpret_cast<uint16_t*>(dest))) {
if (med < 0x20) {
// somehow some table miss the 0x00 - 0x20 part
*dest = med;
} else {
if (aErrorSignal) {
res = NS_ERROR_ILLEGAL_INPUT;
break;
}
// Unicode replacement value for unmappable chars
*dest = 0xfffd;
}
}
src += bcr;
srcLen -= bcr;
dest++;
}
if ((srcLen > 0) && (res == NS_OK)) res = NS_OK_UDEC_MOREOUTPUT;
*aSrcLength = src - aSrc;
*aDestLength = dest - aDest;
return res;
}
nsresult nsUnicodeDecodeHelper::ConvertByMultiTable(
const char * aSrc,
int32_t * aSrcLength,
char16_t * aDest,
int32_t * aDestLength,
int32_t aTableCount,
const uRange * aRangeArray,
uScanClassID * aScanClassArray,
uMappingTable ** aMappingTable,
bool aErrorSignal)
{
uint8_t * src = (uint8_t *)aSrc;
int32_t srcLen = *aSrcLength;
char16_t * dest = aDest;
char16_t * destEnd = aDest + *aDestLength;
char16_t med;
int32_t bcr; // byte count for read
nsresult res = NS_OK;
int32_t i;
while ((srcLen > 0) && (dest < destEnd))
{
bool done= false;
bool passRangeCheck = false;
bool passScan = false;
for (i=0; (!done) && (i<aTableCount); i++)
{
if ((aRangeArray[i].min <= *src) && (*src <= aRangeArray[i].max))
{
passRangeCheck = true;
if (uScan(aScanClassArray[i], nullptr, src,
reinterpret_cast<uint16_t*>(&med), srcLen,
(uint32_t *)&bcr))
{
passScan = true;
done = uMapCode((uTable*) aMappingTable[i],
static_cast<uint16_t>(med),
reinterpret_cast<uint16_t*>(dest));
} // if (uScan ... )
} // if Range
} // for loop
if(passRangeCheck && (! passScan))
{
if (res != NS_ERROR_ILLEGAL_INPUT)
res = NS_OK_UDEC_MOREINPUT;
break;
}
if(! done)
{
bcr = 1;
if ((uint8_t)*src < 0x20) {
// somehow some table miss the 0x00 - 0x20 part
*dest = *src;
} else if(*src == (uint8_t) 0xa0) {
// handle nbsp
*dest = 0x00a0;
} else {
// we need to decide how many byte we skip. We can use uScan to do this
for (i=0; i<aTableCount; i++)
{
if ((aRangeArray[i].min <= *src) && (*src <= aRangeArray[i].max))
{
if (uScan(aScanClassArray[i], nullptr, src,
reinterpret_cast<uint16_t*>(&med), srcLen,
(uint32_t*)&bcr))
{
// match the patten
int32_t k;
for(k = 1; k < bcr; k++)
{
if(0 == (src[k] & 0x80))
{ // only skip if all bytes > 0x80
// if we hit bytes <= 0x80, skip only one byte
bcr = 1;
break;
}
}
break;
}
}
}
// treat it as NSBR if bcr == 1 and it is 0xa0
if ((1==bcr)&&(*src == (uint8_t)0xa0 )) {
*dest = 0x00a0;
} else {
if (aErrorSignal) {
res = NS_ERROR_ILLEGAL_INPUT;
break;
}
*dest = 0xfffd;
}
}
}
src += bcr;
srcLen -= bcr;
dest++;
} // while
if ((srcLen > 0) && (res == NS_OK)) res = NS_OK_UDEC_MOREOUTPUT;
*aSrcLength = src - (uint8_t *)aSrc;
*aDestLength = dest - aDest;
return res;
}
nsresult nsUnicodeDecodeHelper::ConvertByFastTable(
const char * aSrc,
int32_t * aSrcLength,
char16_t * aDest,
int32_t * aDestLength,
const char16_t * aFastTable,
int32_t aTableSize,
bool aErrorSignal)
{
uint8_t * src = (uint8_t *)aSrc;
uint8_t * srcEnd = src;
char16_t * dest = aDest;
nsresult res;
if (*aSrcLength > *aDestLength) {
srcEnd += (*aDestLength);
res = NS_PARTIAL_MORE_OUTPUT;
} else {
srcEnd += (*aSrcLength);
res = NS_OK;
}
for (; src<srcEnd;) {
*dest = aFastTable[*src];
if (*dest == 0xfffd && aErrorSignal) {
res = NS_ERROR_ILLEGAL_INPUT;
break;
}
src++;
dest++;
}
*aSrcLength = src - (uint8_t *)aSrc;
*aDestLength = dest - aDest;
return res;
}
nsresult nsUnicodeDecodeHelper::CreateFastTable(
uMappingTable * aMappingTable,
char16_t * aFastTable,
int32_t aTableSize)
{
int32_t tableSize = aTableSize;
int32_t buffSize = aTableSize;
auto buff = mozilla::MakeUnique<char[]>(buffSize);
char * p = buff.get();
for (int32_t i=0; i<aTableSize; i++) *(p++) = i;
return ConvertByTable(buff.get(), &buffSize, aFastTable, &tableSize,
u1ByteCharset, nullptr, aMappingTable);
}
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