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Bug 827070. r=smontagu

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This commit is contained in:
Mats Palmgren 2013-01-20 13:40:09 +01:00
parent 7a42e0132e
commit 53b5adb1df
1 changed files with 18 additions and 6 deletions
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24
intl/unicharutil/src/nsSaveAsCharset.cpp
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@ -1,4 +1,5 @@
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
@ -127,6 +128,8 @@ nsSaveAsCharset::GetCharset(char * *aCharset)
/////////////////////////////////////////////////////////////////////////////////////////
#define RESERVE_FALLBACK_BYTES 512
// do the fallback, reallocate the buffer if necessary
// need to pass destination buffer info (size, current position and estimation of rest of the conversion)
NS_IMETHODIMP
@ -144,14 +147,16 @@ nsSaveAsCharset::HandleFallBack(uint32_t character, char **outString, int32_t *b
// reallocate if the buffer is not large enough
if ((tempLen + estimatedLength) >= (*bufferLength - *currentPos)) {
char *temp = (char *) PR_Realloc(*outString, *bufferLength + tempLen);
int32_t addLength = tempLen + RESERVE_FALLBACK_BYTES;
// + 1 is for the terminating NUL, don't add that to bufferLength
char *temp = (char *) PR_Realloc(*outString, *bufferLength + addLength + 1);
if (temp) {
// adjust length/pointer after realloc
*bufferLength += tempLen;
*bufferLength += addLength;
*outString = temp;
} else {
*outString = nullptr;
*bufferLength =0;
*bufferLength = 0;
return NS_ERROR_OUT_OF_MEMORY;
}
}
@ -180,12 +185,19 @@ nsSaveAsCharset::DoCharsetConversion(const PRUnichar *inString, char **outString
rv = mEncoder->GetMaxLength(inString, inStringLength, &dstLength);
if (NS_FAILED(rv)) return rv;
bufferLength = dstLength + 512; // reserve 512 byte for fallback.
char *dstPtr = (char *) PR_Malloc(bufferLength);
bufferLength = dstLength + RESERVE_FALLBACK_BYTES; // extra bytes for fallback
// + 1 is for the terminating NUL -- we don't add that to bufferLength so that
// we can always write dstPtr[pos2] = '\0' even when the encoder filled the
// buffer.
char *dstPtr = (char *) PR_Malloc(bufferLength + 1);
if (!dstPtr) {
return NS_ERROR_OUT_OF_MEMORY;
}
for (pos1 = 0, pos2 = 0; pos1 < inStringLength;) {
// convert from unicode
dstLength = bufferLength - pos2;
NS_ASSERTION(dstLength >= 0, "out of bounds write");
rv = mEncoder->Convert(&inString[pos1], &srcLength, &dstPtr[pos2], &dstLength);
pos1 += srcLength ? srcLength : 1;