mirror of
https://github.com/mozilla/gecko-dev.git
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641 lines
20 KiB
C++
641 lines
20 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 "pratom.h"
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#include "nsAlgorithm.h"
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#include "nsIComponentManager.h"
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#include "nsUCSupport.h"
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#include "nsUnicodeDecodeHelper.h"
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#include "nsUnicodeEncodeHelper.h"
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#define DEFAULT_BUFFER_CAPACITY 16
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// XXX review the buffer growth limitation code
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//----------------------------------------------------------------------
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// Class nsBasicDecoderSupport [implementation]
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nsBasicDecoderSupport::nsBasicDecoderSupport()
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: mErrBehavior(kOnError_Recover)
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{
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}
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nsBasicDecoderSupport::~nsBasicDecoderSupport()
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{
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}
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//----------------------------------------------------------------------
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// Interface nsISupports [implementation]
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#ifdef DEBUG
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NS_IMPL_THREADSAFE_ISUPPORTS2(nsBasicDecoderSupport,
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nsIUnicodeDecoder,
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nsIBasicDecoder)
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#else
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NS_IMPL_THREADSAFE_ISUPPORTS1(nsBasicDecoderSupport, nsIUnicodeDecoder)
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#endif
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//----------------------------------------------------------------------
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// Interface nsIUnicodeDecoder [implementation]
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void
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nsBasicDecoderSupport::SetInputErrorBehavior(int32_t aBehavior)
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{
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NS_ABORT_IF_FALSE(aBehavior == kOnError_Recover || aBehavior == kOnError_Signal,
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"Unknown behavior for SetInputErrorBehavior");
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mErrBehavior = aBehavior;
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}
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PRUnichar
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nsBasicDecoderSupport::GetCharacterForUnMapped()
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{
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return PRUnichar(0xfffd); // Unicode REPLACEMENT CHARACTER
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}
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//----------------------------------------------------------------------
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// Class nsBufferDecoderSupport [implementation]
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nsBufferDecoderSupport::nsBufferDecoderSupport(uint32_t aMaxLengthFactor)
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: nsBasicDecoderSupport(),
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mMaxLengthFactor(aMaxLengthFactor)
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{
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mBufferCapacity = DEFAULT_BUFFER_CAPACITY;
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mBuffer = new char[mBufferCapacity];
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Reset();
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}
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nsBufferDecoderSupport::~nsBufferDecoderSupport()
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{
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delete [] mBuffer;
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}
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void nsBufferDecoderSupport::FillBuffer(const char ** aSrc, int32_t aSrcLength)
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{
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int32_t bcr = NS_MIN(mBufferCapacity - mBufferLength, aSrcLength);
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memcpy(mBuffer + mBufferLength, *aSrc, bcr);
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mBufferLength += bcr;
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(*aSrc) += bcr;
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}
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//----------------------------------------------------------------------
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// Subclassing of nsBasicDecoderSupport class [implementation]
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NS_IMETHODIMP nsBufferDecoderSupport::Convert(const char * aSrc,
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int32_t * aSrcLength,
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PRUnichar * aDest,
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int32_t * aDestLength)
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{
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// we do all operations using pointers internally
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const char * src = aSrc;
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const char * srcEnd = aSrc + *aSrcLength;
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PRUnichar * dest = aDest;
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PRUnichar * destEnd = aDest + *aDestLength;
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int32_t bcr, bcw; // byte counts for read & write;
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nsresult res = NS_OK;
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// do we have some residual data from the last conversion?
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if (mBufferLength > 0) {
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if (dest == destEnd) {
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res = NS_OK_UDEC_MOREOUTPUT;
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} else {
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for (;;) {
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// we need new data to add to the buffer
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if (src == srcEnd) {
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res = NS_OK_UDEC_MOREINPUT;
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break;
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}
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// fill that buffer
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int32_t buffLen = mBufferLength; // initial buffer length
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FillBuffer(&src, srcEnd - src);
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// convert that buffer
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bcr = mBufferLength;
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bcw = destEnd - dest;
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res = ConvertNoBuff(mBuffer, &bcr, dest, &bcw);
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dest += bcw;
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// Detect invalid input character
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if (res == NS_ERROR_ILLEGAL_INPUT && mErrBehavior == kOnError_Signal) {
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break;
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}
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if ((res == NS_OK_UDEC_MOREINPUT) && (bcw == 0)) {
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res = NS_ERROR_UNEXPECTED;
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#if defined(DEBUG_yokoyama) || defined(DEBUG_ftang)
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NS_ERROR("This should not happen. Internal buffer may be corrupted.");
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#endif
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break;
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} else {
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if (bcr < buffLen) {
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// we didn't convert that residual data - unfill the buffer
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src -= mBufferLength - buffLen;
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mBufferLength = buffLen;
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#if defined(DEBUG_yokoyama) || defined(DEBUG_ftang)
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NS_ERROR("This should not happen. Internal buffer may be corrupted.");
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#endif
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} else {
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// the buffer and some extra data was converted - unget the rest
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src -= mBufferLength - bcr;
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mBufferLength = 0;
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res = NS_OK;
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}
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break;
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}
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}
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}
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}
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if (res == NS_OK) {
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bcr = srcEnd - src;
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bcw = destEnd - dest;
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res = ConvertNoBuff(src, &bcr, dest, &bcw);
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src += bcr;
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dest += bcw;
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// if we have partial input, store it in our internal buffer.
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if (res == NS_OK_UDEC_MOREINPUT) {
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bcr = srcEnd - src;
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// make sure buffer is large enough
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if (bcr > mBufferCapacity) {
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// somehow we got into an error state and the buffer is growing out
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// of control
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res = NS_ERROR_UNEXPECTED;
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} else {
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FillBuffer(&src, bcr);
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}
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}
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}
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*aSrcLength -= srcEnd - src;
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*aDestLength -= destEnd - dest;
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return res;
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}
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NS_IMETHODIMP nsBufferDecoderSupport::Reset()
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{
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mBufferLength = 0;
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return NS_OK;
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}
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NS_IMETHODIMP nsBufferDecoderSupport::GetMaxLength(const char* aSrc,
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int32_t aSrcLength,
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int32_t* aDestLength)
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{
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NS_ASSERTION(mMaxLengthFactor != 0, "Must override GetMaxLength!");
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*aDestLength = aSrcLength * mMaxLengthFactor;
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return NS_OK;
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}
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//----------------------------------------------------------------------
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// Class nsTableDecoderSupport [implementation]
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nsTableDecoderSupport::nsTableDecoderSupport(uScanClassID aScanClass,
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uShiftInTable * aShiftInTable,
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uMappingTable * aMappingTable,
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uint32_t aMaxLengthFactor)
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: nsBufferDecoderSupport(aMaxLengthFactor)
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{
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mScanClass = aScanClass;
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mShiftInTable = aShiftInTable;
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mMappingTable = aMappingTable;
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}
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nsTableDecoderSupport::~nsTableDecoderSupport()
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{
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}
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//----------------------------------------------------------------------
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// Subclassing of nsBufferDecoderSupport class [implementation]
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NS_IMETHODIMP nsTableDecoderSupport::ConvertNoBuff(const char * aSrc,
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int32_t * aSrcLength,
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PRUnichar * aDest,
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int32_t * aDestLength)
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{
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return nsUnicodeDecodeHelper::ConvertByTable(aSrc, aSrcLength,
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aDest, aDestLength,
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mScanClass,
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mShiftInTable, mMappingTable,
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mErrBehavior == kOnError_Signal);
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}
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//----------------------------------------------------------------------
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// Class nsMultiTableDecoderSupport [implementation]
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nsMultiTableDecoderSupport::nsMultiTableDecoderSupport(
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int32_t aTableCount,
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const uRange * aRangeArray,
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uScanClassID * aScanClassArray,
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uMappingTable ** aMappingTable,
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uint32_t aMaxLengthFactor)
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: nsBufferDecoderSupport(aMaxLengthFactor)
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{
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mTableCount = aTableCount;
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mRangeArray = aRangeArray;
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mScanClassArray = aScanClassArray;
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mMappingTable = aMappingTable;
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}
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nsMultiTableDecoderSupport::~nsMultiTableDecoderSupport()
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{
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}
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//----------------------------------------------------------------------
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// Subclassing of nsBufferDecoderSupport class [implementation]
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NS_IMETHODIMP nsMultiTableDecoderSupport::ConvertNoBuff(const char * aSrc,
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int32_t * aSrcLength,
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PRUnichar * aDest,
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int32_t * aDestLength)
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{
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return nsUnicodeDecodeHelper::ConvertByMultiTable(aSrc, aSrcLength,
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aDest, aDestLength,
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mTableCount, mRangeArray,
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mScanClassArray,
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mMappingTable,
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mErrBehavior == kOnError_Signal);
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}
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//----------------------------------------------------------------------
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// Class nsOneByteDecoderSupport [implementation]
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nsOneByteDecoderSupport::nsOneByteDecoderSupport(
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uMappingTable * aMappingTable)
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: nsBasicDecoderSupport()
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, mMappingTable(aMappingTable)
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, mFastTableCreated(false)
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, mFastTableMutex("nsOneByteDecoderSupport mFastTableMutex")
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{
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}
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nsOneByteDecoderSupport::~nsOneByteDecoderSupport()
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{
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}
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//----------------------------------------------------------------------
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// Subclassing of nsBasicDecoderSupport class [implementation]
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NS_IMETHODIMP nsOneByteDecoderSupport::Convert(const char * aSrc,
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int32_t * aSrcLength,
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PRUnichar * aDest,
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int32_t * aDestLength)
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{
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if (!mFastTableCreated) {
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// Probably better to make this non-lazy and get rid of the mutex
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mozilla::MutexAutoLock autoLock(mFastTableMutex);
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if (!mFastTableCreated) {
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nsresult res = nsUnicodeDecodeHelper::CreateFastTable(
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mMappingTable, mFastTable, ONE_BYTE_TABLE_SIZE);
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if (NS_FAILED(res)) return res;
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mFastTableCreated = true;
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}
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}
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return nsUnicodeDecodeHelper::ConvertByFastTable(aSrc, aSrcLength,
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aDest, aDestLength,
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mFastTable,
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ONE_BYTE_TABLE_SIZE,
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mErrBehavior == kOnError_Signal);
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}
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NS_IMETHODIMP nsOneByteDecoderSupport::GetMaxLength(const char * aSrc,
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int32_t aSrcLength,
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int32_t * aDestLength)
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{
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// single byte to Unicode converter
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*aDestLength = aSrcLength;
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return NS_OK_UDEC_EXACTLENGTH;
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}
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NS_IMETHODIMP nsOneByteDecoderSupport::Reset()
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{
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// nothing to reset, no internal state in this case
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return NS_OK;
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}
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//----------------------------------------------------------------------
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// Class nsBasicEncoder [implementation]
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nsBasicEncoder::nsBasicEncoder()
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{
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}
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nsBasicEncoder::~nsBasicEncoder()
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{
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}
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//----------------------------------------------------------------------
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// Interface nsISupports [implementation]
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NS_IMPL_ADDREF(nsBasicEncoder)
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NS_IMPL_RELEASE(nsBasicEncoder)
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#ifdef DEBUG
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NS_IMPL_QUERY_INTERFACE2(nsBasicEncoder,
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nsIUnicodeEncoder,
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nsIBasicEncoder)
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#else
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NS_IMPL_QUERY_INTERFACE1(nsBasicEncoder,
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nsIUnicodeEncoder)
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#endif
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//----------------------------------------------------------------------
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// Class nsEncoderSupport [implementation]
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nsEncoderSupport::nsEncoderSupport(uint32_t aMaxLengthFactor) :
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mMaxLengthFactor(aMaxLengthFactor)
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{
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mBufferCapacity = DEFAULT_BUFFER_CAPACITY;
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mBuffer = new char[mBufferCapacity];
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mErrBehavior = kOnError_Signal;
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mErrChar = 0;
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Reset();
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}
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nsEncoderSupport::~nsEncoderSupport()
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{
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delete [] mBuffer;
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}
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NS_IMETHODIMP nsEncoderSupport::ConvertNoBuff(const PRUnichar * aSrc,
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int32_t * aSrcLength,
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char * aDest,
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int32_t * aDestLength)
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{
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// we do all operations using pointers internally
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const PRUnichar * src = aSrc;
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const PRUnichar * srcEnd = aSrc + *aSrcLength;
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char * dest = aDest;
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char * destEnd = aDest + *aDestLength;
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int32_t bcr, bcw; // byte counts for read & write;
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nsresult res;
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for (;;) {
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bcr = srcEnd - src;
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bcw = destEnd - dest;
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res = ConvertNoBuffNoErr(src, &bcr, dest, &bcw);
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src += bcr;
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dest += bcw;
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if (res == NS_ERROR_UENC_NOMAPPING) {
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if (mErrBehavior == kOnError_Replace) {
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const PRUnichar buff[] = {mErrChar};
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bcr = 1;
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bcw = destEnd - dest;
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src--; // back the input: maybe the guy won't consume consume anything.
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res = ConvertNoBuffNoErr(buff, &bcr, dest, &bcw);
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src += bcr;
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dest += bcw;
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if (res != NS_OK) break;
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} else if (mErrBehavior == kOnError_CallBack) {
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bcw = destEnd - dest;
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src--;
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res = mErrEncoder->Convert(*src, dest, &bcw);
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dest += bcw;
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// if enought output space then the last char was used
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if (res != NS_OK_UENC_MOREOUTPUT) src++;
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if (res != NS_OK) break;
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} else break;
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}
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else break;
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}
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*aSrcLength -= srcEnd - src;
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*aDestLength -= destEnd - dest;
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return res;
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}
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NS_IMETHODIMP nsEncoderSupport::FinishNoBuff(char * aDest,
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int32_t * aDestLength)
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{
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*aDestLength = 0;
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return NS_OK;
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}
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nsresult nsEncoderSupport::FlushBuffer(char ** aDest, const char * aDestEnd)
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{
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int32_t bcr, bcw; // byte counts for read & write;
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nsresult res = NS_OK;
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char * dest = *aDest;
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if (mBufferStart < mBufferEnd) {
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bcr = mBufferEnd - mBufferStart;
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bcw = aDestEnd - dest;
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if (bcw < bcr) bcr = bcw;
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memcpy(dest, mBufferStart, bcr);
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dest += bcr;
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mBufferStart += bcr;
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if (mBufferStart < mBufferEnd) res = NS_OK_UENC_MOREOUTPUT;
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}
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*aDest = dest;
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return res;
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}
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//----------------------------------------------------------------------
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// Interface nsIUnicodeEncoder [implementation]
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NS_IMETHODIMP nsEncoderSupport::Convert(const PRUnichar * aSrc,
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int32_t * aSrcLength,
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char * aDest,
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int32_t * aDestLength)
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{
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// we do all operations using pointers internally
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const PRUnichar * src = aSrc;
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const PRUnichar * srcEnd = aSrc + *aSrcLength;
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char * dest = aDest;
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char * destEnd = aDest + *aDestLength;
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int32_t bcr, bcw; // byte counts for read & write;
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nsresult res;
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res = FlushBuffer(&dest, destEnd);
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if (res == NS_OK_UENC_MOREOUTPUT) goto final;
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bcr = srcEnd - src;
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bcw = destEnd - dest;
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res = ConvertNoBuff(src, &bcr, dest, &bcw);
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src += bcr;
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dest += bcw;
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if ((res == NS_OK_UENC_MOREOUTPUT) && (dest < destEnd)) {
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// convert exactly one character into the internal buffer
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// at this point, there should be at least a char in the input
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for (;;) {
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bcr = 1;
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bcw = mBufferCapacity;
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res = ConvertNoBuff(src, &bcr, mBuffer, &bcw);
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if (res == NS_OK_UENC_MOREOUTPUT) {
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delete [] mBuffer;
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mBufferCapacity *= 2;
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mBuffer = new char [mBufferCapacity];
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} else {
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src += bcr;
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mBufferStart = mBufferEnd = mBuffer;
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mBufferEnd += bcw;
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break;
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}
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}
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res = FlushBuffer(&dest, destEnd);
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}
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final:
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*aSrcLength -= srcEnd - src;
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*aDestLength -= destEnd - dest;
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return res;
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}
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NS_IMETHODIMP nsEncoderSupport::Finish(char * aDest, int32_t * aDestLength)
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{
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// we do all operations using pointers internally
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char * dest = aDest;
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char * destEnd = aDest + *aDestLength;
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int32_t bcw; // byte count for write;
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nsresult res;
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res = FlushBuffer(&dest, destEnd);
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if (res == NS_OK_UENC_MOREOUTPUT) goto final;
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// do the finish into the internal buffer.
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for (;;) {
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bcw = mBufferCapacity;
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res = FinishNoBuff(mBuffer, &bcw);
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if (res == NS_OK_UENC_MOREOUTPUT) {
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delete [] mBuffer;
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mBufferCapacity *= 2;
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mBuffer = new char [mBufferCapacity];
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} else {
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mBufferStart = mBufferEnd = mBuffer;
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mBufferEnd += bcw;
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break;
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}
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}
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res = FlushBuffer(&dest, destEnd);
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final:
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*aDestLength -= destEnd - dest;
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return res;
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}
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NS_IMETHODIMP nsEncoderSupport::Reset()
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{
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mBufferStart = mBufferEnd = mBuffer;
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return NS_OK;
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}
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NS_IMETHODIMP nsEncoderSupport::SetOutputErrorBehavior(
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int32_t aBehavior,
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nsIUnicharEncoder * aEncoder,
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PRUnichar aChar)
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{
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if (aBehavior == kOnError_CallBack && !aEncoder)
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return NS_ERROR_NULL_POINTER;
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mErrEncoder = aEncoder;
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mErrBehavior = aBehavior;
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mErrChar = aChar;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEncoderSupport::GetMaxLength(const PRUnichar * aSrc,
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int32_t aSrcLength,
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int32_t * aDestLength)
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{
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*aDestLength = aSrcLength * mMaxLengthFactor;
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|
return NS_OK;
|
|
}
|
|
|
|
|
|
//----------------------------------------------------------------------
|
|
// Class nsTableEncoderSupport [implementation]
|
|
|
|
nsTableEncoderSupport::nsTableEncoderSupport(uScanClassID aScanClass,
|
|
uShiftOutTable * aShiftOutTable,
|
|
uMappingTable * aMappingTable,
|
|
uint32_t aMaxLengthFactor)
|
|
: nsEncoderSupport(aMaxLengthFactor)
|
|
{
|
|
mScanClass = aScanClass;
|
|
mShiftOutTable = aShiftOutTable,
|
|
mMappingTable = aMappingTable;
|
|
}
|
|
|
|
nsTableEncoderSupport::nsTableEncoderSupport(uScanClassID aScanClass,
|
|
uMappingTable * aMappingTable,
|
|
uint32_t aMaxLengthFactor)
|
|
: nsEncoderSupport(aMaxLengthFactor)
|
|
{
|
|
mScanClass = aScanClass;
|
|
mShiftOutTable = nullptr;
|
|
mMappingTable = aMappingTable;
|
|
}
|
|
|
|
nsTableEncoderSupport::~nsTableEncoderSupport()
|
|
{
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
// Subclassing of nsEncoderSupport class [implementation]
|
|
|
|
NS_IMETHODIMP nsTableEncoderSupport::ConvertNoBuffNoErr(
|
|
const PRUnichar * aSrc,
|
|
int32_t * aSrcLength,
|
|
char * aDest,
|
|
int32_t * aDestLength)
|
|
{
|
|
return nsUnicodeEncodeHelper::ConvertByTable(aSrc, aSrcLength,
|
|
aDest, aDestLength,
|
|
mScanClass,
|
|
mShiftOutTable, mMappingTable);
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
// Class nsMultiTableEncoderSupport [implementation]
|
|
|
|
nsMultiTableEncoderSupport::nsMultiTableEncoderSupport(
|
|
int32_t aTableCount,
|
|
uScanClassID * aScanClassArray,
|
|
uShiftOutTable ** aShiftOutTable,
|
|
uMappingTable ** aMappingTable,
|
|
uint32_t aMaxLengthFactor)
|
|
: nsEncoderSupport(aMaxLengthFactor)
|
|
{
|
|
mTableCount = aTableCount;
|
|
mScanClassArray = aScanClassArray;
|
|
mShiftOutTable = aShiftOutTable;
|
|
mMappingTable = aMappingTable;
|
|
}
|
|
|
|
nsMultiTableEncoderSupport::~nsMultiTableEncoderSupport()
|
|
{
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
// Subclassing of nsEncoderSupport class [implementation]
|
|
|
|
NS_IMETHODIMP nsMultiTableEncoderSupport::ConvertNoBuffNoErr(
|
|
const PRUnichar * aSrc,
|
|
int32_t * aSrcLength,
|
|
char * aDest,
|
|
int32_t * aDestLength)
|
|
{
|
|
return nsUnicodeEncodeHelper::ConvertByMultiTable(aSrc, aSrcLength,
|
|
aDest, aDestLength,
|
|
mTableCount,
|
|
mScanClassArray,
|
|
mShiftOutTable,
|
|
mMappingTable);
|
|
}
|