mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
375 lines
11 KiB
C++
375 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "prmem.h"
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#include "prprf.h"
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#include "nsSaveAsCharset.h"
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#include "nsWhitespaceTokenizer.h"
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#include "nsIUnicodeEncoder.h"
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#include "mozilla/dom/EncodingUtils.h"
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#include "nsComponentManagerUtils.h"
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using mozilla::dom::EncodingUtils;
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//
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// nsISupports methods
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//
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NS_IMPL_ISUPPORTS(nsSaveAsCharset, nsISaveAsCharset)
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//
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// nsSaveAsCharset
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//
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nsSaveAsCharset::nsSaveAsCharset()
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{
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mAttribute = attr_htmlTextDefault;
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mEntityVersion = 0;
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mCharsetListIndex = -1;
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}
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nsSaveAsCharset::~nsSaveAsCharset()
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{
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}
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NS_IMETHODIMP
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nsSaveAsCharset::Init(const char *charset, uint32_t attr, uint32_t entityVersion)
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{
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nsresult rv = NS_OK;
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mAttribute = attr;
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mEntityVersion = entityVersion;
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rv = SetupCharsetList(charset);
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NS_ENSURE_SUCCESS(rv, rv);
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// set up unicode encoder
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rv = SetupUnicodeEncoder(GetNextCharset());
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NS_ENSURE_SUCCESS(rv, rv);
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// set up entity converter
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if (attr_EntityNone != MASK_ENTITY(mAttribute) && !mEntityConverter)
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mEntityConverter = do_CreateInstance(NS_ENTITYCONVERTER_CONTRACTID, &rv);
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return rv;
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}
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NS_IMETHODIMP
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nsSaveAsCharset::Convert(const char16_t *inString, char **_retval)
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{
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NS_ENSURE_ARG_POINTER(_retval);
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NS_ENSURE_ARG_POINTER(inString);
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if (0 == *inString)
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return NS_ERROR_ILLEGAL_VALUE;
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nsresult rv = NS_OK;
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NS_ASSERTION(mEncoder, "need to call Init() before Convert()");
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NS_ENSURE_TRUE(mEncoder, NS_ERROR_FAILURE);
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*_retval = nullptr;
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// make sure to start from the first charset in the list
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if (mCharsetListIndex > 0) {
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mCharsetListIndex = -1;
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rv = SetupUnicodeEncoder(GetNextCharset());
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NS_ENSURE_SUCCESS(rv, rv);
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}
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do {
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// fallback to the next charset in the list if the last conversion failed by an unmapped character
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if (MASK_CHARSET_FALLBACK(mAttribute) && NS_ERROR_UENC_NOMAPPING == rv) {
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const char * charset = GetNextCharset();
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if (!charset)
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break;
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rv = SetupUnicodeEncoder(charset);
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NS_ENSURE_SUCCESS(rv, rv);
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PR_FREEIF(*_retval);
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}
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if (attr_EntityBeforeCharsetConv == MASK_ENTITY(mAttribute)) {
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NS_ASSERTION(mEntityConverter, "need to call Init() before Convert()");
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NS_ENSURE_TRUE(mEntityConverter, NS_ERROR_FAILURE);
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char16_t *entity = nullptr;
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// do the entity conversion first
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rv = mEntityConverter->ConvertToEntities(inString, mEntityVersion, &entity);
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if(NS_SUCCEEDED(rv)) {
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rv = DoCharsetConversion(entity, _retval);
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nsMemory::Free(entity);
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}
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}
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else
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rv = DoCharsetConversion(inString, _retval);
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} while (MASK_CHARSET_FALLBACK(mAttribute) && NS_ERROR_UENC_NOMAPPING == rv);
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return rv;
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}
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NS_IMETHODIMP
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nsSaveAsCharset::GetCharset(char * *aCharset)
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{
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NS_ENSURE_ARG(aCharset);
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NS_ASSERTION(mCharsetListIndex >= 0, "need to call Init() first");
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NS_ENSURE_TRUE(mCharsetListIndex >= 0, NS_ERROR_FAILURE);
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const char* charset = mCharsetList[mCharsetListIndex].get();
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if (!charset) {
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*aCharset = nullptr;
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NS_ASSERTION(charset, "make sure to call Init() with non empty charset list");
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return NS_ERROR_FAILURE;
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}
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*aCharset = strdup(charset);
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return (*aCharset) ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
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}
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/////////////////////////////////////////////////////////////////////////////////////////
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#define RESERVE_FALLBACK_BYTES 512
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// do the fallback, reallocate the buffer if necessary
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// need to pass destination buffer info (size, current position and estimation of rest of the conversion)
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NS_IMETHODIMP
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nsSaveAsCharset::HandleFallBack(uint32_t character, char **outString, int32_t *bufferLength,
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int32_t *currentPos, int32_t estimatedLength)
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{
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NS_ENSURE_ARG_POINTER(outString);
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NS_ENSURE_ARG_POINTER(bufferLength);
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NS_ENSURE_ARG_POINTER(currentPos);
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char fallbackStr[256];
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nsresult rv = DoConversionFallBack(character, fallbackStr, 256);
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if (NS_SUCCEEDED(rv)) {
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int32_t tempLen = (int32_t) strlen(fallbackStr);
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// reallocate if the buffer is not large enough
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if ((tempLen + estimatedLength) >= (*bufferLength - *currentPos)) {
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int32_t addLength = tempLen + RESERVE_FALLBACK_BYTES;
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// + 1 is for the terminating NUL, don't add that to bufferLength
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char *temp = (char *) PR_Realloc(*outString, *bufferLength + addLength + 1);
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if (temp) {
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// adjust length/pointer after realloc
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*bufferLength += addLength;
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*outString = temp;
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} else {
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*outString = nullptr;
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*bufferLength = 0;
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return NS_ERROR_OUT_OF_MEMORY;
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}
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}
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memcpy((*outString + *currentPos), fallbackStr, tempLen);
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*currentPos += tempLen;
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}
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return rv;
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}
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NS_IMETHODIMP
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nsSaveAsCharset::DoCharsetConversion(const char16_t *inString, char **outString)
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{
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NS_ENSURE_ARG_POINTER(outString);
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*outString = nullptr;
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nsresult rv;
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int32_t inStringLength = NS_strlen(inString); // original input string length
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int32_t bufferLength; // allocated buffer length
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int32_t srcLength = inStringLength;
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int32_t dstLength;
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int32_t pos1, pos2;
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nsresult saveResult = NS_OK; // to remember NS_ERROR_UENC_NOMAPPING
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// estimate and allocate the target buffer (reserve extra memory for fallback)
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rv = mEncoder->GetMaxLength(inString, inStringLength, &dstLength);
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if (NS_FAILED(rv)) return rv;
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bufferLength = dstLength + RESERVE_FALLBACK_BYTES; // extra bytes for fallback
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// + 1 is for the terminating NUL -- we don't add that to bufferLength so that
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// we can always write dstPtr[pos2] = '\0' even when the encoder filled the
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// buffer.
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char *dstPtr = (char *) PR_Malloc(bufferLength + 1);
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if (!dstPtr) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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for (pos1 = 0, pos2 = 0; pos1 < inStringLength;) {
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// convert from unicode
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dstLength = bufferLength - pos2;
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NS_ASSERTION(dstLength >= 0, "out of bounds write");
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rv = mEncoder->Convert(&inString[pos1], &srcLength, &dstPtr[pos2], &dstLength);
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pos1 += srcLength ? srcLength : 1;
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pos2 += dstLength;
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dstPtr[pos2] = '\0';
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// break: this is usually the case (no error) OR unrecoverable error
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if (NS_ERROR_UENC_NOMAPPING != rv) break;
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// remember this happened and reset the result
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saveResult = rv;
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rv = NS_OK;
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// finish encoder, give it a chance to write extra data like escape sequences
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dstLength = bufferLength - pos2;
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rv = mEncoder->Finish(&dstPtr[pos2], &dstLength);
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if (NS_SUCCEEDED(rv)) {
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pos2 += dstLength;
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dstPtr[pos2] = '\0';
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}
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srcLength = inStringLength - pos1;
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// do the fallback
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if (!ATTR_NO_FALLBACK(mAttribute)) {
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uint32_t unMappedChar;
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if (NS_IS_HIGH_SURROGATE(inString[pos1-1]) &&
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inStringLength > pos1 && NS_IS_LOW_SURROGATE(inString[pos1])) {
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unMappedChar = SURROGATE_TO_UCS4(inString[pos1-1], inString[pos1]);
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pos1++;
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} else {
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unMappedChar = inString[pos1-1];
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}
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rv = mEncoder->GetMaxLength(inString+pos1, inStringLength-pos1, &dstLength);
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if (NS_FAILED(rv))
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break;
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rv = HandleFallBack(unMappedChar, &dstPtr, &bufferLength, &pos2, dstLength);
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if (NS_FAILED(rv))
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break;
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dstPtr[pos2] = '\0';
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}
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}
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if (NS_SUCCEEDED(rv)) {
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// finish encoder, give it a chance to write extra data like escape sequences
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dstLength = bufferLength - pos2;
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rv = mEncoder->Finish(&dstPtr[pos2], &dstLength);
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if (NS_SUCCEEDED(rv)) {
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pos2 += dstLength;
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dstPtr[pos2] = '\0';
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}
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}
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if (NS_FAILED(rv)) {
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PR_FREEIF(dstPtr);
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return rv;
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}
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*outString = dstPtr; // set the result string
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// set error code so that the caller can do own fall back
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if (NS_ERROR_UENC_NOMAPPING == saveResult) {
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rv = NS_ERROR_UENC_NOMAPPING;
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}
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return rv;
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}
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NS_IMETHODIMP
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nsSaveAsCharset::DoConversionFallBack(uint32_t inUCS4, char *outString, int32_t bufferLength)
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{
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NS_ENSURE_ARG_POINTER(outString);
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*outString = '\0';
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nsresult rv = NS_OK;
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if (ATTR_NO_FALLBACK(mAttribute)) {
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return NS_OK;
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}
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if (attr_EntityAfterCharsetConv == MASK_ENTITY(mAttribute)) {
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char *entity = nullptr;
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rv = mEntityConverter->ConvertUTF32ToEntity(inUCS4, mEntityVersion, &entity);
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if (NS_SUCCEEDED(rv)) {
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if (!entity || (int32_t)strlen(entity) > bufferLength) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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PL_strcpy(outString, entity);
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nsMemory::Free(entity);
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return rv;
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}
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}
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switch (MASK_FALLBACK(mAttribute)) {
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case attr_FallbackQuestionMark:
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if(bufferLength>=2) {
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*outString++='?';
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*outString='\0';
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rv = NS_OK;
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} else {
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rv = NS_ERROR_FAILURE;
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}
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break;
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case attr_FallbackEscapeU:
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if (inUCS4 & 0xff0000)
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rv = (PR_snprintf(outString, bufferLength, "\\u%.6x", inUCS4) > 0) ? NS_OK : NS_ERROR_FAILURE;
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else
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rv = (PR_snprintf(outString, bufferLength, "\\u%.4x", inUCS4) > 0) ? NS_OK : NS_ERROR_FAILURE;
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break;
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case attr_FallbackDecimalNCR:
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rv = ( PR_snprintf(outString, bufferLength, "&#%u;", inUCS4) > 0) ? NS_OK : NS_ERROR_FAILURE;
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break;
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case attr_FallbackHexNCR:
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rv = (PR_snprintf(outString, bufferLength, "&#x%x;", inUCS4) > 0) ? NS_OK : NS_ERROR_FAILURE;
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break;
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case attr_FallbackNone:
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rv = NS_OK;
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break;
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default:
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rv = NS_ERROR_ILLEGAL_VALUE;
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break;
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}
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return rv;
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}
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nsresult nsSaveAsCharset::SetupUnicodeEncoder(const char* charset)
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{
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NS_ENSURE_ARG(charset);
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nsDependentCString label(charset);
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if (label.EqualsLiteral("replacement")) {
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// Internal caller. "replacement" doesn't survive another label resolution.
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mEncoder = EncodingUtils::EncoderForEncoding(label);
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return NS_OK;
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}
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nsAutoCString encoding;
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if (!EncodingUtils::FindEncodingForLabelNoReplacement(label,
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encoding)) {
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return NS_ERROR_UCONV_NOCONV;
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}
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mEncoder = EncodingUtils::EncoderForEncoding(encoding);
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return NS_OK;
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}
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nsresult nsSaveAsCharset::SetupCharsetList(const char *charsetList)
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{
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NS_ENSURE_ARG(charsetList);
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NS_ASSERTION(charsetList[0], "charsetList should not be empty");
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if (!charsetList[0])
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return NS_ERROR_INVALID_ARG;
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if (mCharsetListIndex >= 0) {
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mCharsetList.Clear();
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mCharsetListIndex = -1;
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}
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nsCWhitespaceTokenizer tokenizer((nsDependentCString(charsetList)));
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while (tokenizer.hasMoreTokens()) {
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ParseString(tokenizer.nextToken(), ',', mCharsetList);
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}
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return NS_OK;
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}
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const char * nsSaveAsCharset::GetNextCharset()
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{
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if ((mCharsetListIndex + 1) >= int32_t(mCharsetList.Length()))
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return nullptr;
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// bump the index and return the next charset
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return mCharsetList[++mCharsetListIndex].get();
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}
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