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gecko/modules/libpr0n/decoders/nsICODecoder.cpp

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/* vim:set tw=80 expandtab softtabstop=4 ts=4 sw=4: */
/* ***** 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 the Mozilla ICO Decoder.
*
* The Initial Developer of the Original Code is
* Netscape.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* David Hyatt <hyatt@netscape.com> (Original Author)
* Christian Biesinger <cbiesinger@web.de>
* Bobby Holley <bobbyholley@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either 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 ***** */
/* This is a Cross-Platform ICO Decoder, which should work everywhere, including
* Big-Endian machines like the PowerPC. */
#include <stdlib.h>
#include "nsICODecoder.h"
#include "nsIInputStream.h"
#include "nsIComponentManager.h"
#include "RasterImage.h"
#include "imgIContainerObserver.h"
#include "nsIProperties.h"
#include "nsISupportsPrimitives.h"
namespace mozilla {
namespace imagelib {
#define ICONCOUNTOFFSET 4
#define DIRENTRYOFFSET 6
#define BITMAPINFOSIZE 40
#define PREFICONSIZE 16
// ----------------------------------------
// Actual Data Processing
// ----------------------------------------
PRUint32 nsICODecoder::CalcAlphaRowSize()
{
// Calculate rowsize in DWORD's and then return in # of bytes
PRUint32 rowSize = (mDirEntry.mWidth + 31) / 32; // +31 to round up
return rowSize * 4; // Return rowSize in bytes
}
nsICODecoder::nsICODecoder()
{
mPos = mNumColors = mRowBytes = mImageOffset = mCurrIcon = mNumIcons = 0;
mCurLine = 1; // Otherwise decoder will never start
mColors = nsnull;
mRow = nsnull;
mHaveAlphaData = mDecodingAndMask = PR_FALSE;
}
nsICODecoder::~nsICODecoder()
{
mPos = 0;
delete[] mColors;
mCurLine = 0;
mRowBytes = 0;
mImageOffset = 0;
mCurrIcon = 0;
mNumIcons = 0;
if (mRow) {
free(mRow);
mRow = nsnull;
}
mDecodingAndMask = PR_FALSE;
}
void
nsICODecoder::FinishInternal()
{
// We shouldn't be called in error cases
NS_ABORT_IF_FALSE(!HasError(), "Shouldn't call FinishInternal after error!");
// We should never make multiple frames
NS_ABORT_IF_FALSE(GetFrameCount() <= 1, "Multiple ICO frames?");
// Send notifications if appropriate
if (!IsSizeDecode() && (GetFrameCount() == 1)) {
// Invalidate
nsIntRect r(0, 0, mDirEntry.mWidth, mDirEntry.mHeight);
PostInvalidation(r);
PostFrameStop();
PostDecodeDone();
}
}
void
nsICODecoder::WriteInternal(const char* aBuffer, PRUint32 aCount)
{
NS_ABORT_IF_FALSE(!HasError(), "Shouldn't call WriteInternal after error!");
if (!aCount) // aCount=0 means EOF
return;
while (aCount && (mPos < ICONCOUNTOFFSET)) { // Skip to the # of icons.
if (mPos == 2) { // if the third byte is 1: This is an icon, 2: a cursor
if ((*aBuffer != 1) && (*aBuffer != 2)) {
PostDataError();
return;
}
mIsCursor = (*aBuffer == 2);
}
mPos++; aBuffer++; aCount--;
}
if (mPos == ICONCOUNTOFFSET && aCount >= 2) {
mNumIcons = LITTLE_TO_NATIVE16(((PRUint16*)aBuffer)[0]);
aBuffer += 2;
mPos += 2;
aCount -= 2;
}
if (mNumIcons == 0)
return; // Nothing to do.
PRUint16 colorDepth = 0;
while (mCurrIcon < mNumIcons) {
if (mPos >= DIRENTRYOFFSET + (mCurrIcon*sizeof(mDirEntryArray)) &&
mPos < DIRENTRYOFFSET + ((mCurrIcon+1)*sizeof(mDirEntryArray))) {
PRUint32 toCopy = sizeof(mDirEntryArray) - (mPos - DIRENTRYOFFSET - mCurrIcon*sizeof(mDirEntryArray));
if (toCopy > aCount)
toCopy = aCount;
memcpy(mDirEntryArray + sizeof(mDirEntryArray) - toCopy, aBuffer, toCopy);
mPos += toCopy;
aCount -= toCopy;
aBuffer += toCopy;
}
if (aCount == 0)
return; // Need more data
IconDirEntry e;
if (mPos == 22+mCurrIcon*sizeof(mDirEntryArray)) {
mCurrIcon++;
ProcessDirEntry(e);
if ((e.mWidth == PREFICONSIZE && e.mHeight == PREFICONSIZE && e.mBitCount >= colorDepth)
|| (mCurrIcon == mNumIcons && mImageOffset == 0)) {
mImageOffset = e.mImageOffset;
// ensure mImageOffset is >= the size of the direntry headers (bug #245631)
PRUint32 minImageOffset = DIRENTRYOFFSET + mNumIcons*sizeof(mDirEntryArray);
if (mImageOffset < minImageOffset) {
PostDataError();
return;
}
colorDepth = e.mBitCount;
memcpy(&mDirEntry, &e, sizeof(IconDirEntry));
}
}
}
if (mPos < mImageOffset) {
// Skip to (or at least towards) the desired image offset
PRUint32 toSkip = mImageOffset - mPos;
if (toSkip > aCount)
toSkip = aCount;
mPos += toSkip;
aBuffer += toSkip;
aCount -= toSkip;
}
if (mCurrIcon == mNumIcons && mPos >= mImageOffset && mPos < mImageOffset + BITMAPINFOSIZE) {
// We've found the icon.
PRUint32 toCopy = sizeof(mBIHraw) - (mPos - mImageOffset);
if (toCopy > aCount)
toCopy = aCount;
memcpy(mBIHraw + (mPos - mImageOffset), aBuffer, toCopy);
mPos += toCopy;
aCount -= toCopy;
aBuffer += toCopy;
}
nsresult rv;
if (mPos == mImageOffset + BITMAPINFOSIZE) {
ProcessInfoHeader();
PostSize(mDirEntry.mWidth, mDirEntry.mHeight);
if (IsSizeDecode())
return;
if (mBIH.bpp <= 8) {
switch (mBIH.bpp) {
case 1:
mNumColors = 2;
break;
case 4:
mNumColors = 16;
break;
case 8:
mNumColors = 256;
break;
default:
PostDataError();
return;
}
mColors = new colorTable[mNumColors];
}
if (mIsCursor) {
nsCOMPtr<nsISupportsPRUint32> intwrapx = do_CreateInstance("@mozilla.org/supports-PRUint32;1");
nsCOMPtr<nsISupportsPRUint32> intwrapy = do_CreateInstance("@mozilla.org/supports-PRUint32;1");
if (intwrapx && intwrapy) {
intwrapx->SetData(mDirEntry.mXHotspot);
intwrapy->SetData(mDirEntry.mYHotspot);
mImage->Set("hotspotX", intwrapx);
mImage->Set("hotspotY", intwrapy);
}
}
mCurLine = mDirEntry.mHeight;
mRow = (PRUint8*)moz_malloc((mDirEntry.mWidth * mBIH.bpp)/8 + 4);
// +4 because the line is padded to a 4 bit boundary, but I don't want
// to make exact calculations here, that's unnecessary.
// Also, it compensates rounding error.
if (!mRow) {
PostDecoderError(NS_ERROR_OUT_OF_MEMORY);
return;
}
PRUint32 imageLength;
rv = mImage->EnsureFrame(0, 0, 0, mDirEntry.mWidth, mDirEntry.mHeight,
gfxASurface::ImageFormatARGB32, (PRUint8**)&mImageData, &imageLength);
if (NS_FAILED(rv)) {
PostDecoderError(rv);
return;
}
// Tell the superclass we're starting a frame
PostFrameStart();
}
if (mColors && (mPos >= mImageOffset + BITMAPINFOSIZE) &&
(mPos < (mImageOffset + BITMAPINFOSIZE + mNumColors * 4))) {
// We will receive (mNumColors * 4) bytes of color data
PRUint32 colorBytes = mPos - (mImageOffset + 40); // Number of bytes already received
PRUint8 colorNum = colorBytes / 4; // Color which is currently received
PRUint8 at = colorBytes % 4;
while (aCount && (mPos < (mImageOffset + BITMAPINFOSIZE + mNumColors * 4))) {
switch (at) {
case 0:
mColors[colorNum].blue = *aBuffer;
break;
case 1:
mColors[colorNum].green = *aBuffer;
break;
case 2:
mColors[colorNum].red = *aBuffer;
break;
case 3:
colorNum++; // This is a padding byte
break;
}
mPos++; aBuffer++; aCount--;
at = (at + 1) % 4;
}
}
if (!mDecodingAndMask && (mPos >= (mImageOffset + BITMAPINFOSIZE + mNumColors*4))) {
if (mPos == (mImageOffset + BITMAPINFOSIZE + mNumColors*4)) {
// Increment mPos to avoid reprocessing the info header.
mPos++;
}
// Ensure memory has been allocated before decoding. If we get this far
// without allocated memory, the file is most likely invalid.
// XXXbholley - If null values can be triggered by bad input, why are we
// asserting here?
NS_ASSERTION(mRow, "mRow is null");
NS_ASSERTION(mImageData, "mImageData is null");
if (!mRow || !mImageData) {
PostDataError();
return;
}
PRUint32 rowSize = (mBIH.bpp * mDirEntry.mWidth + 7) / 8; // +7 to round up
if (rowSize % 4)
rowSize += (4 - (rowSize % 4)); // Pad to DWORD Boundary
PRUint32 toCopy;
do {
toCopy = rowSize - mRowBytes;
if (toCopy) {
if (toCopy > aCount)
toCopy = aCount;
memcpy(mRow + mRowBytes, aBuffer, toCopy);
aCount -= toCopy;
aBuffer += toCopy;
mRowBytes += toCopy;
}
if (rowSize == mRowBytes) {
mCurLine--;
PRUint32* d = mImageData + (mCurLine * mDirEntry.mWidth);
PRUint8* p = mRow;
PRUint32 lpos = mDirEntry.mWidth;
switch (mBIH.bpp) {
case 1:
while (lpos > 0) {
PRInt8 bit;
PRUint8 idx;
for (bit = 7; bit >= 0 && lpos > 0; bit--) {
idx = (*p >> bit) & 1;
SetPixel(d, idx, mColors);
--lpos;
}
++p;
}
break;
case 4:
while (lpos > 0) {
Set4BitPixel(d, *p, lpos, mColors);
++p;
}
break;
case 8:
while (lpos > 0) {
SetPixel(d, *p, mColors);
--lpos;
++p;
}
break;
case 16:
while (lpos > 0) {
SetPixel(d,
(p[1] & 124) << 1,
((p[1] & 3) << 6) | ((p[0] & 224) >> 2),
(p[0] & 31) << 3);
--lpos;
p+=2;
}
break;
case 24:
while (lpos > 0) {
SetPixel(d, p[2], p[1], p[0]);
p += 3;
--lpos;
}
break;
case 32:
// We assume that 32bit doesn't have alpha data until we
// find a non-zero alpha byte. If we find such a byte,
// it means that all previous pixels are really clear (alphabyte=0).
// This working assumption prevents us having to premultiply afterwards.
while (lpos > 0) {
if (!mHaveAlphaData && p[3]) {
// Non-zero alpha byte detected! Clear previous pixels from current row to end
memset(mImageData + mCurLine * mDirEntry.mWidth, 0,
(mDirEntry.mHeight - mCurLine) * mDirEntry.mWidth * sizeof(PRUint32));
mHaveAlphaData = PR_TRUE;
}
SetPixel(d, p[2], p[1], p[0], mHaveAlphaData ? p[3] : 0xFF);
p += 4;
--lpos;
}
break;
default:
// This is probably the wrong place to check this...
PostDataError();
return;
}
if (mCurLine == 0)
mDecodingAndMask = PR_TRUE;
mRowBytes = 0;
}
} while (!mDecodingAndMask && aCount > 0);
}
if (mDecodingAndMask && !mHaveAlphaData) {
PRUint32 rowSize = CalcAlphaRowSize();
if (mPos == (1 + mImageOffset + BITMAPINFOSIZE + mNumColors*4)) {
mPos++;
mRowBytes = 0;
mCurLine = mDirEntry.mHeight;
mRow = (PRUint8*)realloc(mRow, rowSize);
if (!mRow) {
PostDecoderError(NS_ERROR_OUT_OF_MEMORY);
return;
}
}
// Ensure memory has been allocated before decoding.
NS_ASSERTION(mRow, "mRow is null");
NS_ASSERTION(mImageData, "mImageData is null");
if (!mRow || !mImageData) {
PostDataError();
return;
}
while (mCurLine > 0 && aCount > 0) {
PRUint32 toCopy = NS_MIN(rowSize - mRowBytes, aCount);
if (toCopy) {
memcpy(mRow + mRowBytes, aBuffer, toCopy);
aCount -= toCopy;
aBuffer += toCopy;
mRowBytes += toCopy;
}
if (rowSize == mRowBytes) {
mCurLine--;
mRowBytes = 0;
PRUint32* decoded = mImageData + mCurLine * mDirEntry.mWidth;
PRUint32* decoded_end = decoded + mDirEntry.mWidth;
PRUint8* p = mRow, *p_end = mRow + rowSize;
while (p < p_end) {
PRUint8 idx = *p++;
for (PRUint8 bit = 0x80; bit && decoded<decoded_end; bit >>= 1) {
// Clear pixel completely for transparency.
if (idx & bit) *decoded = 0;
decoded ++;
}
}
}
}
}
return;
}
void
nsICODecoder::ProcessDirEntry(IconDirEntry& aTarget)
{
memset(&aTarget, 0, sizeof(aTarget));
memcpy(&aTarget.mWidth, mDirEntryArray, sizeof(aTarget.mWidth));
memcpy(&aTarget.mHeight, mDirEntryArray+1, sizeof(aTarget.mHeight));
memcpy(&aTarget.mColorCount, mDirEntryArray+2, sizeof(aTarget.mColorCount));
memcpy(&aTarget.mReserved, mDirEntryArray+3, sizeof(aTarget.mReserved));
memcpy(&aTarget.mPlanes, mDirEntryArray+4, sizeof(aTarget.mPlanes));
aTarget.mPlanes = LITTLE_TO_NATIVE16(aTarget.mPlanes);
memcpy(&aTarget.mBitCount, mDirEntryArray+6, sizeof(aTarget.mBitCount));
aTarget.mBitCount = LITTLE_TO_NATIVE16(aTarget.mBitCount);
memcpy(&aTarget.mBytesInRes, mDirEntryArray+8, sizeof(aTarget.mBytesInRes));
aTarget.mBytesInRes = LITTLE_TO_NATIVE32(aTarget.mBytesInRes);
memcpy(&aTarget.mImageOffset, mDirEntryArray+12, sizeof(aTarget.mImageOffset));
aTarget.mImageOffset = LITTLE_TO_NATIVE32(aTarget.mImageOffset);
}
void nsICODecoder::ProcessInfoHeader() {
memset(&mBIH, 0, sizeof(mBIH));
// Ignoring the size; it should always be 40 for icons, anyway
memcpy(&mBIH.width, mBIHraw + 4, sizeof(mBIH.width));
memcpy(&mBIH.height, mBIHraw + 8, sizeof(mBIH.height));
memcpy(&mBIH.planes, mBIHraw + 12, sizeof(mBIH.planes));
memcpy(&mBIH.bpp, mBIHraw + 14, sizeof(mBIH.bpp));
memcpy(&mBIH.compression, mBIHraw + 16, sizeof(mBIH.compression));
memcpy(&mBIH.image_size, mBIHraw + 20, sizeof(mBIH.image_size));
memcpy(&mBIH.xppm, mBIHraw + 24, sizeof(mBIH.xppm));
memcpy(&mBIH.yppm, mBIHraw + 28, sizeof(mBIH.yppm));
memcpy(&mBIH.colors, mBIHraw + 32, sizeof(mBIH.colors));
memcpy(&mBIH.important_colors, mBIHraw + 36, sizeof(mBIH.important_colors));
// Convert endianness
mBIH.width = LITTLE_TO_NATIVE32(mBIH.width);
mBIH.height = LITTLE_TO_NATIVE32(mBIH.height);
mBIH.planes = LITTLE_TO_NATIVE16(mBIH.planes);
mBIH.bpp = LITTLE_TO_NATIVE16(mBIH.bpp);
mBIH.compression = LITTLE_TO_NATIVE32(mBIH.compression);
mBIH.image_size = LITTLE_TO_NATIVE32(mBIH.image_size);
mBIH.xppm = LITTLE_TO_NATIVE32(mBIH.xppm);
mBIH.yppm = LITTLE_TO_NATIVE32(mBIH.yppm);
mBIH.colors = LITTLE_TO_NATIVE32(mBIH.colors);
mBIH.important_colors = LITTLE_TO_NATIVE32(mBIH.important_colors);
}
} // namespace imagelib
} // namespace mozilla
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