gecko/intl/uconv/util/nsUCSupport.cpp

659 lines
21 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "pratom.h"
#include "nsIComponentManager.h"
#include "nsICharRepresentable.h"
#include "nsUCSupport.h"
#include "nsUnicodeDecodeHelper.h"
#include "nsUnicodeEncodeHelper.h"
#define DEFAULT_BUFFER_CAPACITY 16
// XXX review the buffer growth limitation code
//----------------------------------------------------------------------
// Class nsBasicDecoderSupport [implementation]
nsBasicDecoderSupport::nsBasicDecoderSupport()
{
}
nsBasicDecoderSupport::~nsBasicDecoderSupport()
{
}
//----------------------------------------------------------------------
// Interface nsISupports [implementation]
NS_IMPL_ADDREF(nsBasicDecoderSupport)
NS_IMPL_RELEASE(nsBasicDecoderSupport)
#ifdef NS_DEBUG
NS_IMPL_QUERY_INTERFACE2(nsBasicDecoderSupport, nsIUnicodeDecoder, nsIBasicDecoder)
#else
NS_IMPL_QUERY_INTERFACE1(nsBasicDecoderSupport, nsIUnicodeDecoder)
#endif
//----------------------------------------------------------------------
// Interface nsIUnicodeDecoder [implementation]
//----------------------------------------------------------------------
// Class nsBufferDecoderSupport [implementation]
nsBufferDecoderSupport::nsBufferDecoderSupport(PRUint32 aMaxLengthFactor)
: nsBasicDecoderSupport(),
mMaxLengthFactor(aMaxLengthFactor)
{
mBufferCapacity = DEFAULT_BUFFER_CAPACITY;
mBuffer = new char[mBufferCapacity];
Reset();
}
nsBufferDecoderSupport::~nsBufferDecoderSupport()
{
delete [] mBuffer;
}
void nsBufferDecoderSupport::FillBuffer(const char ** aSrc, PRInt32 aSrcLength)
{
PRInt32 bcr = PR_MIN(mBufferCapacity - mBufferLength, aSrcLength);
memcpy(mBuffer + mBufferLength, *aSrc, bcr);
mBufferLength += bcr;
(*aSrc) += bcr;
}
void nsBufferDecoderSupport::DoubleBuffer()
{
mBufferCapacity *= 2;
char * newBuffer = new char [mBufferCapacity];
if (mBufferLength > 0) memcpy(newBuffer, mBuffer, mBufferLength);
delete [] mBuffer;
mBuffer = newBuffer;
}
//----------------------------------------------------------------------
// Subclassing of nsBasicDecoderSupport class [implementation]
NS_IMETHODIMP nsBufferDecoderSupport::Convert(const char * aSrc,
PRInt32 * aSrcLength,
PRUnichar * aDest,
PRInt32 * aDestLength)
{
// we do all operations using pointers internally
const char * src = aSrc;
const char * srcEnd = aSrc + *aSrcLength;
PRUnichar * dest = aDest;
PRUnichar * destEnd = aDest + *aDestLength;
PRInt32 bcr, bcw; // byte counts for read & write;
nsresult res = NS_OK;
// do we have some residual data from the last conversion?
if (mBufferLength > 0) if (dest == destEnd) {
res = NS_OK_UDEC_MOREOUTPUT;
} else for (;;) {
// we need new data to add to the buffer
if (src == srcEnd) {
res = NS_OK_UDEC_MOREINPUT;
break;
}
// fill that buffer
PRInt32 buffLen = mBufferLength; // initial buffer length
FillBuffer(&src, srcEnd - src);
// convert that buffer
bcr = mBufferLength;
bcw = destEnd - dest;
res = ConvertNoBuff(mBuffer, &bcr, dest, &bcw);
dest += bcw;
if ((res == NS_OK_UDEC_MOREINPUT) && (bcw == 0)) {
res = NS_ERROR_UNEXPECTED;
#if defined(DEBUG_yokoyama) || defined(DEBUG_ftang)
NS_ASSERTION(0, "This should not happen. Internal buffer may be corrupted.");
#endif
break;
} else {
if (bcr < buffLen) {
// we didn't convert that residual data - unfill the buffer
src -= mBufferLength - buffLen;
mBufferLength = buffLen;
#if defined(DEBUG_yokoyama) || defined(DEBUG_ftang)
NS_ASSERTION(0, "This should not happen. Internal buffer may be corrupted.");
#endif
} else {
// the buffer and some extra data was converted - unget the rest
src -= mBufferLength - bcr;
mBufferLength = 0;
res = NS_OK;
}
break;
}
}
if (res == NS_OK) {
bcr = srcEnd - src;
bcw = destEnd - dest;
res = ConvertNoBuff(src, &bcr, dest, &bcw);
src += bcr;
dest += bcw;
// if we have partial input, store it in our internal buffer.
if (res == NS_OK_UDEC_MOREINPUT) {
bcr = srcEnd - src;
// make sure buffer is large enough
if (bcr > mBufferCapacity) {
// somehow we got into an error state and the buffer is growing out of control
res = NS_ERROR_UNEXPECTED;
} else {
FillBuffer(&src, bcr);
}
}
}
*aSrcLength -= srcEnd - src;
*aDestLength -= destEnd - dest;
return res;
}
NS_IMETHODIMP nsBufferDecoderSupport::Reset()
{
mBufferLength = 0;
return NS_OK;
}
NS_IMETHODIMP nsBufferDecoderSupport::GetMaxLength(const char* aSrc,
PRInt32 aSrcLength,
PRInt32* aDestLength)
{
NS_ASSERTION(mMaxLengthFactor != 0, "Must override GetMaxLength!");
*aDestLength = aSrcLength * mMaxLengthFactor;
return NS_OK;
}
//----------------------------------------------------------------------
// Class nsTableDecoderSupport [implementation]
nsTableDecoderSupport::nsTableDecoderSupport(uScanClassID aScanClass,
uShiftInTable * aShiftInTable,
uMappingTable * aMappingTable,
PRUint32 aMaxLengthFactor)
: nsBufferDecoderSupport(aMaxLengthFactor)
{
mScanClass = aScanClass;
mShiftInTable = aShiftInTable;
mMappingTable = aMappingTable;
}
nsTableDecoderSupport::~nsTableDecoderSupport()
{
}
//----------------------------------------------------------------------
// Subclassing of nsBufferDecoderSupport class [implementation]
NS_IMETHODIMP nsTableDecoderSupport::ConvertNoBuff(const char * aSrc,
PRInt32 * aSrcLength,
PRUnichar * aDest,
PRInt32 * aDestLength)
{
return nsUnicodeDecodeHelper::ConvertByTable(aSrc, aSrcLength,
aDest, aDestLength,
mScanClass,
mShiftInTable, mMappingTable);
}
//----------------------------------------------------------------------
// Class nsMultiTableDecoderSupport [implementation]
nsMultiTableDecoderSupport::nsMultiTableDecoderSupport(
PRInt32 aTableCount,
const uRange * aRangeArray,
uScanClassID * aScanClassArray,
uMappingTable ** aMappingTable,
PRUint32 aMaxLengthFactor)
: nsBufferDecoderSupport(aMaxLengthFactor)
{
mTableCount = aTableCount;
mRangeArray = aRangeArray;
mScanClassArray = aScanClassArray;
mMappingTable = aMappingTable;
}
nsMultiTableDecoderSupport::~nsMultiTableDecoderSupport()
{
}
//----------------------------------------------------------------------
// Subclassing of nsBufferDecoderSupport class [implementation]
NS_IMETHODIMP nsMultiTableDecoderSupport::ConvertNoBuff(const char * aSrc,
PRInt32 * aSrcLength,
PRUnichar * aDest,
PRInt32 * aDestLength)
{
return nsUnicodeDecodeHelper::ConvertByMultiTable(aSrc, aSrcLength,
aDest, aDestLength,
mTableCount, mRangeArray,
mScanClassArray,
mMappingTable);
}
//----------------------------------------------------------------------
// Class nsOneByteDecoderSupport [implementation]
nsOneByteDecoderSupport::nsOneByteDecoderSupport(
uMappingTable * aMappingTable)
: nsBasicDecoderSupport()
{
mMappingTable = aMappingTable;
mFastTableCreated = PR_FALSE;
}
nsOneByteDecoderSupport::~nsOneByteDecoderSupport()
{
}
//----------------------------------------------------------------------
// Subclassing of nsBasicDecoderSupport class [implementation]
NS_IMETHODIMP nsOneByteDecoderSupport::Convert(const char * aSrc,
PRInt32 * aSrcLength,
PRUnichar * aDest,
PRInt32 * aDestLength)
{
if (!mFastTableCreated) {
nsresult res = nsUnicodeDecodeHelper::CreateFastTable(
mMappingTable, mFastTable, ONE_BYTE_TABLE_SIZE);
if (NS_FAILED(res)) return res;
mFastTableCreated = PR_TRUE;
}
return nsUnicodeDecodeHelper::ConvertByFastTable(aSrc, aSrcLength,
aDest, aDestLength,
mFastTable,
ONE_BYTE_TABLE_SIZE);
}
NS_IMETHODIMP nsOneByteDecoderSupport::GetMaxLength(const char * aSrc,
PRInt32 aSrcLength,
PRInt32 * aDestLength)
{
// single byte to Unicode converter
*aDestLength = aSrcLength;
return NS_OK_UDEC_EXACTLENGTH;
}
NS_IMETHODIMP nsOneByteDecoderSupport::Reset()
{
// nothing to reset, no internal state in this case
return NS_OK;
}
//----------------------------------------------------------------------
// Class nsBasicEncoder [implementation]
nsBasicEncoder::nsBasicEncoder()
{
}
nsBasicEncoder::~nsBasicEncoder()
{
}
//----------------------------------------------------------------------
// Interface nsISupports [implementation]
NS_IMPL_ADDREF(nsBasicEncoder)
NS_IMPL_RELEASE(nsBasicEncoder)
#ifdef NS_DEBUG
NS_IMPL_QUERY_INTERFACE3(nsBasicEncoder,
nsIUnicodeEncoder,
nsICharRepresentable, nsIBasicEncoder)
#else
NS_IMPL_QUERY_INTERFACE2(nsBasicEncoder,
nsIUnicodeEncoder,
nsICharRepresentable)
#endif
//----------------------------------------------------------------------
// Class nsEncoderSupport [implementation]
nsEncoderSupport::nsEncoderSupport(PRUint32 aMaxLengthFactor) :
mMaxLengthFactor(aMaxLengthFactor)
{
mBufferCapacity = DEFAULT_BUFFER_CAPACITY;
mBuffer = new char[mBufferCapacity];
mErrBehavior = kOnError_Signal;
mErrChar = 0;
Reset();
}
nsEncoderSupport::~nsEncoderSupport()
{
delete [] mBuffer;
}
NS_IMETHODIMP nsEncoderSupport::ConvertNoBuff(const PRUnichar * aSrc,
PRInt32 * aSrcLength,
char * aDest,
PRInt32 * aDestLength)
{
// we do all operations using pointers internally
const PRUnichar * src = aSrc;
const PRUnichar * srcEnd = aSrc + *aSrcLength;
char * dest = aDest;
char * destEnd = aDest + *aDestLength;
PRInt32 bcr, bcw; // byte counts for read & write;
nsresult res;
for (;;) {
bcr = srcEnd - src;
bcw = destEnd - dest;
res = ConvertNoBuffNoErr(src, &bcr, dest, &bcw);
src += bcr;
dest += bcw;
if (res == NS_ERROR_UENC_NOMAPPING) {
if (mErrBehavior == kOnError_Replace) {
const PRUnichar buff[] = {mErrChar};
bcr = 1;
bcw = destEnd - dest;
src--; // back the input: maybe the guy won't consume consume anything.
res = ConvertNoBuffNoErr(buff, &bcr, dest, &bcw);
src += bcr;
dest += bcw;
if (res != NS_OK) break;
} else if (mErrBehavior == kOnError_CallBack) {
bcw = destEnd - dest;
src--;
res = mErrEncoder->Convert(*src, dest, &bcw);
dest += bcw;
// if enought output space then the last char was used
if (res != NS_OK_UENC_MOREOUTPUT) src++;
if (res != NS_OK) break;
} else break;
}
else break;
}
*aSrcLength -= srcEnd - src;
*aDestLength -= destEnd - dest;
return res;
}
NS_IMETHODIMP nsEncoderSupport::FinishNoBuff(char * aDest,
PRInt32 * aDestLength)
{
*aDestLength = 0;
return NS_OK;
}
nsresult nsEncoderSupport::FlushBuffer(char ** aDest, const char * aDestEnd)
{
PRInt32 bcr, bcw; // byte counts for read & write;
nsresult res = NS_OK;
char * dest = *aDest;
if (mBufferStart < mBufferEnd) {
bcr = mBufferEnd - mBufferStart;
bcw = aDestEnd - dest;
if (bcw < bcr) bcr = bcw;
memcpy(dest, mBufferStart, bcr);
dest += bcr;
mBufferStart += bcr;
if (mBufferStart < mBufferEnd) res = NS_OK_UENC_MOREOUTPUT;
}
*aDest = dest;
return res;
}
//----------------------------------------------------------------------
// Interface nsIUnicodeEncoder [implementation]
NS_IMETHODIMP nsEncoderSupport::Convert(const PRUnichar * aSrc,
PRInt32 * aSrcLength,
char * aDest,
PRInt32 * aDestLength)
{
// we do all operations using pointers internally
const PRUnichar * src = aSrc;
const PRUnichar * srcEnd = aSrc + *aSrcLength;
char * dest = aDest;
char * destEnd = aDest + *aDestLength;
PRInt32 bcr, bcw; // byte counts for read & write;
nsresult res;
res = FlushBuffer(&dest, destEnd);
if (res == NS_OK_UENC_MOREOUTPUT) goto final;
bcr = srcEnd - src;
bcw = destEnd - dest;
res = ConvertNoBuff(src, &bcr, dest, &bcw);
src += bcr;
dest += bcw;
if ((res == NS_OK_UENC_MOREOUTPUT) && (dest < destEnd)) {
// convert exactly one character into the internal buffer
// at this point, there should be at least a char in the input
for (;;) {
bcr = 1;
bcw = mBufferCapacity;
res = ConvertNoBuff(src, &bcr, mBuffer, &bcw);
if (res == NS_OK_UENC_MOREOUTPUT) {
delete [] mBuffer;
mBufferCapacity *= 2;
mBuffer = new char [mBufferCapacity];
} else {
src += bcr;
mBufferStart = mBufferEnd = mBuffer;
mBufferEnd += bcw;
break;
}
}
res = FlushBuffer(&dest, destEnd);
}
final:
*aSrcLength -= srcEnd - src;
*aDestLength -= destEnd - dest;
return res;
}
NS_IMETHODIMP nsEncoderSupport::Finish(char * aDest, PRInt32 * aDestLength)
{
// we do all operations using pointers internally
char * dest = aDest;
char * destEnd = aDest + *aDestLength;
PRInt32 bcw; // byte count for write;
nsresult res;
res = FlushBuffer(&dest, destEnd);
if (res == NS_OK_UENC_MOREOUTPUT) goto final;
// do the finish into the internal buffer.
for (;;) {
bcw = mBufferCapacity;
res = FinishNoBuff(mBuffer, &bcw);
if (res == NS_OK_UENC_MOREOUTPUT) {
delete [] mBuffer;
mBufferCapacity *= 2;
mBuffer = new char [mBufferCapacity];
} else {
mBufferStart = mBufferEnd = mBuffer;
mBufferEnd += bcw;
break;
}
}
res = FlushBuffer(&dest, destEnd);
final:
*aDestLength -= destEnd - dest;
return res;
}
NS_IMETHODIMP nsEncoderSupport::Reset()
{
mBufferStart = mBufferEnd = mBuffer;
return NS_OK;
}
NS_IMETHODIMP nsEncoderSupport::SetOutputErrorBehavior(
PRInt32 aBehavior,
nsIUnicharEncoder * aEncoder,
PRUnichar aChar)
{
if (aBehavior == kOnError_CallBack && aEncoder == nsnull)
return NS_ERROR_NULL_POINTER;
mErrEncoder = aEncoder;
mErrBehavior = aBehavior;
mErrChar = aChar;
return NS_OK;
}
NS_IMETHODIMP
nsEncoderSupport::GetMaxLength(const PRUnichar * aSrc,
PRInt32 aSrcLength,
PRInt32 * aDestLength)
{
*aDestLength = aSrcLength * mMaxLengthFactor;
return NS_OK;
}
//----------------------------------------------------------------------
// Class nsTableEncoderSupport [implementation]
nsTableEncoderSupport::nsTableEncoderSupport(uScanClassID aScanClass,
uShiftOutTable * aShiftOutTable,
uMappingTable * aMappingTable,
PRUint32 aMaxLengthFactor)
: nsEncoderSupport(aMaxLengthFactor)
{
mScanClass = aScanClass;
mShiftOutTable = aShiftOutTable,
mMappingTable = aMappingTable;
}
nsTableEncoderSupport::nsTableEncoderSupport(uScanClassID aScanClass,
uMappingTable * aMappingTable,
PRUint32 aMaxLengthFactor)
: nsEncoderSupport(aMaxLengthFactor)
{
mScanClass = aScanClass;
mShiftOutTable = nsnull;
mMappingTable = aMappingTable;
}
nsTableEncoderSupport::~nsTableEncoderSupport()
{
}
NS_IMETHODIMP nsTableEncoderSupport::FillInfo(PRUint32 *aInfo)
{
return nsUnicodeEncodeHelper::FillInfo(aInfo, mMappingTable);
}
//----------------------------------------------------------------------
// Subclassing of nsEncoderSupport class [implementation]
NS_IMETHODIMP nsTableEncoderSupport::ConvertNoBuffNoErr(
const PRUnichar * aSrc,
PRInt32 * aSrcLength,
char * aDest,
PRInt32 * aDestLength)
{
return nsUnicodeEncodeHelper::ConvertByTable(aSrc, aSrcLength,
aDest, aDestLength,
mScanClass,
mShiftOutTable, mMappingTable);
}
//----------------------------------------------------------------------
// Class nsMultiTableEncoderSupport [implementation]
nsMultiTableEncoderSupport::nsMultiTableEncoderSupport(
PRInt32 aTableCount,
uScanClassID * aScanClassArray,
uShiftOutTable ** aShiftOutTable,
uMappingTable ** aMappingTable,
PRUint32 aMaxLengthFactor)
: nsEncoderSupport(aMaxLengthFactor)
{
mTableCount = aTableCount;
mScanClassArray = aScanClassArray;
mShiftOutTable = aShiftOutTable;
mMappingTable = aMappingTable;
}
nsMultiTableEncoderSupport::~nsMultiTableEncoderSupport()
{
}
NS_IMETHODIMP nsMultiTableEncoderSupport::FillInfo(PRUint32 *aInfo)
{
return nsUnicodeEncodeHelper::FillInfo(aInfo,mTableCount, mMappingTable);
}
//----------------------------------------------------------------------
// Subclassing of nsEncoderSupport class [implementation]
NS_IMETHODIMP nsMultiTableEncoderSupport::ConvertNoBuffNoErr(
const PRUnichar * aSrc,
PRInt32 * aSrcLength,
char * aDest,
PRInt32 * aDestLength)
{
return nsUnicodeEncodeHelper::ConvertByMultiTable(aSrc, aSrcLength,
aDest, aDestLength,
mTableCount,
mScanClassArray,
mShiftOutTable,
mMappingTable);
}