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/**************************************************************************/
/* */
/* Copyright (c) 2001, 2009 NoMachine, http://www.nomachine.com/. */
/* */
/* NXCOMP, NX protocol compression and NX extensions to this software */
/* are copyright of NoMachine. Redistribution and use of the present */
/* software is allowed according to terms specified in the file LICENSE */
/* which comes in the source distribution. */
/* */
/* Check http://www.nomachine.com/licensing.html for applicability. */
/* */
/* NX and NoMachine are trademarks of Medialogic S.p.A. */
/* */
/* All rights reserved. */
/* */
/**************************************************************************/
//
// This file obviously supports PNG
// decompression. It was renamed to
// avoid name clashes on Windows.
//
#include <X11/Xmd.h>
#include <unistd.h>
#include <stdio.h>
#include <png.h>
#include "Unpack.h"
#include "Pgn.h"
#define PANIC
#define WARNING
#undef TEST
#undef DEBUG
#define RGB24_TO_PIXEL(bpp,r,g,b) \
((((CARD##bpp)(r) & 0xFF) * srcRedMax2 + 127) / 255 \
<< srcRedShift2 | \
(((CARD##bpp)(g) & 0xFF) * srcGreenMax2 + 127) / 255 \
<< srcGreenShift2 | \
(((CARD##bpp)(b) & 0xFF) * srcBlueMax2 + 127) / 255 \
<< srcBlueShift2)
#define RGB24_TO_PIXEL32(r,g,b) \
(((CARD32)(r) & 0xFF) << srcRedShift2 | \
((CARD32)(g) & 0xFF) << srcGreenShift2 | \
((CARD32)(b) & 0xFF) << srcBlueShift2)
//
// Functions from Unpack.cpp
//
extern int Unpack32To32(const T_colormask *colormask, const unsigned int *data,
unsigned int *out, unsigned int *end);
extern int Unpack24To24(const T_colormask *colormask, const unsigned char *data,
unsigned char *out, unsigned char *end);
extern int Unpack16To16(const T_colormask *colormask, const unsigned char *data,
unsigned char *out, unsigned char *end);
//
// Local functions used for the png decompression.
//
static int DecompressPng16(unsigned char *compressedData, int compressedLen,
unsigned int w, unsigned int h, unsigned char *dstBuf,
int byteOrder);
static int DecompressPng24(unsigned char *compressedData, int compressedLen,
unsigned int w, unsigned int h, unsigned char *dstBuf,
int byteOrder);
static int DecompressPng32(unsigned char *compressedData, int compressedLen,
unsigned int w, unsigned int h, unsigned char *dstBuf,
int byteOrder);
static void PngReadData(png_structp png_ptr, png_bytep data, png_size_t length);
//
// Colormap stuff.
//
CARD16 srcRedMax2, srcGreenMax2, srcBlueMax2;
CARD8 srcRedShift2, srcGreenShift2, srcBlueShift2;
//
// Attributes used for the png decompression.
//
static char *tmpBuf;
static int tmpBufSize = 0;
static int streamPos;
int UnpackPng(T_geometry *geometry, unsigned char method, unsigned char *srcData,
int srcSize, int dstBpp, int dstWidth, int dstHeight,
unsigned char *dstData, int dstSize)
{
int byteOrder = geometry -> image_byte_order;
//
// Check if data is coming from a failed unsplit.
//
if (srcSize < 2 || srcData[0] == SPLIT_PATTERN &&
srcData[1] == SPLIT_PATTERN)
{
#ifdef WARNING
*logofs << "UnpackPng: WARNING! Skipping unpack of dummy data.\n"
<< logofs_flush;
#endif
return -1;
}
#ifdef DEBUG
*logofs << "UnpackPng: Decompressing image with "
<< "srcSize " << srcSize << " and bpp "
<< dstBpp << ".\n" << logofs_flush;
#endif
srcRedShift2 = ffs(geometry -> red_mask) - 1;
srcGreenShift2 = ffs(geometry -> green_mask) - 1;
srcBlueShift2 = ffs(geometry -> blue_mask) - 1;
srcRedMax2 = geometry -> red_mask >> srcRedShift2;
srcGreenMax2 = geometry -> green_mask >> srcGreenShift2;
srcBlueMax2 = geometry -> blue_mask >> srcBlueShift2;
//
// Make enough space in the temporary
// buffer to have one complete row of
// the image with 3 bytes per pixel.
//
tmpBufSize = dstWidth * 3;
tmpBuf = new char [tmpBufSize];
if (tmpBuf == NULL)
{
#ifdef PANIC
*logofs << "UnpackPng: PANIC! Cannot allocate "
<< dstWidth * 3 << " bytes for PNG "
<< "decompressed data.\n" << logofs_flush;
#endif
delete [] tmpBuf;
return -1;
}
int result = 1;
switch (dstBpp)
{
case 8:
{
//
// Simply move the data from srcData to dstData
// taking into consideration the correct padding.
//
int row;
unsigned char * dstBuff = dstData;
unsigned char * srcBuff = srcData;
for (row = 0; row < dstHeight; row++)
{
memcpy(dstBuff, srcBuff, dstWidth );
dstBuff += RoundUp4(dstWidth);
srcBuff += dstWidth;
}
}
case 16:
{
result = DecompressPng16(srcData, srcSize, dstWidth,
dstHeight, dstData, byteOrder);
break;
}
case 24:
{
result = DecompressPng24(srcData, srcSize, dstWidth,
dstHeight, dstData, byteOrder);
break;
}
case 32:
{
result = DecompressPng32(srcData, srcSize, dstWidth,
dstHeight, dstData, byteOrder);
break;
}
default:
{
#ifdef PANIC
*logofs << "UnpackPng: PANIC! Error in PNG compression. "
<< " Unsupported Bpp value " << dstBpp
<< " for the PNG compression"
<< ".\n" << logofs_flush;
#endif
delete [] tmpBuf;
result = -1;
}
}
if (result == -1)
{
delete [] tmpBuf;
return result;
}
//
// Apply the correction for the brightness
//
int maskMethod;
switch (method)
{
case PACK_PNG_8_COLORS:
{
maskMethod = MASK_8_COLORS;
break;
}
case PACK_PNG_64_COLORS:
{
maskMethod = MASK_64_COLORS;
break;
}
case PACK_PNG_256_COLORS:
{
maskMethod = MASK_256_COLORS;
break;
}
case PACK_PNG_512_COLORS:
{
maskMethod = MASK_512_COLORS;
break;
}
case PACK_PNG_4K_COLORS:
{
maskMethod = MASK_4K_COLORS;
break;
}
case PACK_PNG_32K_COLORS:
{
maskMethod = MASK_32K_COLORS;
break;
}
case PACK_PNG_64K_COLORS:
{
maskMethod = MASK_64K_COLORS;
break;
}
case PACK_PNG_256K_COLORS:
{
maskMethod = MASK_256K_COLORS;
break;
}
case PACK_PNG_2M_COLORS:
{
maskMethod = MASK_2M_COLORS;
break;
}
case PACK_PNG_16M_COLORS:
{
maskMethod = MASK_16M_COLORS;
break;
}
default:
{
#ifdef PANIC
*logofs << "DecompressPng16: PANIC! "
<< " No matching decompression method.\n"
<< logofs_flush;
#endif
delete [] tmpBuf;
return -1;
}
}
const T_colormask *colorMask = MethodColorMask(maskMethod);
unsigned char *dstBuff = dstData;
switch (dstBpp)
{
case 16:
{
Unpack16To16(colorMask, dstBuff, dstBuff, dstBuff + dstSize);
break;
}
case 24:
{
break;
}
case 32:
{
Unpack32To32(colorMask, (unsigned int *)dstBuff, (unsigned int *)dstBuff,
(unsigned int *)(dstBuff + dstSize));
break;
}
default:
{
#ifdef PANIC
*logofs << "DecompressPng16: PANIC! "
<< " No matching destination bits per plane.\n"
<< logofs_flush;
#endif
delete [] tmpBuf;
return -1;
}
}
delete [] tmpBuf;
return 1;
}
//
// Functions that actually do
// the PNG decompression.
//
int DecompressPng16(unsigned char *compressedData, int compressedLen,
unsigned int w, unsigned int h, unsigned char *dstBuf, int byteOrder)
{
unsigned char *data;
unsigned int dx, dy;
png_structp pngPtr;
png_infop infoPtr;
png_bytep rowPointers;
streamPos = 0;
pngPtr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!pngPtr)
{
#ifdef PANIC
*logofs << "DecompressPng16: PANIC! "
<< " Failed png_create_read_struct operation"
<< ".\n" << logofs_flush;
#endif
return -1;
}
infoPtr = png_create_info_struct(pngPtr);
if (!infoPtr)
{
#ifdef PANIC
*logofs << "DecompressPng16: PANIC! "
<< "Failed png_create_info_struct operation"
<< ".\n" << logofs_flush;
#endif
png_destroy_read_struct(&pngPtr, NULL, NULL);
return -1;
}
if (setjmp(png_jmpbuf(pngPtr)))
{
#ifdef PANIC
*logofs << "DecompressPng16: PANIC! "
<< "Error during IO initialization"
<< ".\n" << logofs_flush;
#endif
png_destroy_read_struct(&pngPtr, &infoPtr, NULL);
return -1;
}
png_set_read_fn(pngPtr, (void *)compressedData, PngReadData);
if (setjmp(png_jmpbuf(pngPtr)))
{
#ifdef PANIC
*logofs << "DecompressPng16: PANIC! "
<< "Error during read of PNG header"
<< ".\n" << logofs_flush;
#endif
png_destroy_read_struct(&pngPtr, &infoPtr, NULL);
return -1;
}
png_read_info(pngPtr, infoPtr);
if (infoPtr -> color_type == PNG_COLOR_TYPE_PALETTE)
{
png_set_expand(pngPtr);
}
//
// data points to dstBuf which is
// already padded correctly for the final
// image to put
//
data = dstBuf;
rowPointers = (png_byte *) tmpBuf;
//
// We use setjmp() to save our context.
// The PNG library will call longjmp()
// in case of error.
//
if (setjmp(png_jmpbuf(pngPtr)))
{
#ifdef PANIC
*logofs << "DecompressPng16: PANIC! "
<< "Error during read of PNG rows"
<< ".\n" << logofs_flush;
#endif
png_destroy_read_struct(&pngPtr, &infoPtr, NULL);
return -1;
}
unsigned long pixel;
for (dy = 0; dy < h; dy++)
{
png_read_row(pngPtr, rowPointers, NULL);
for (dx = 0; dx < w; dx++)
{
pixel = RGB24_TO_PIXEL(16, tmpBuf[dx*3], tmpBuf[dx*3+1], tmpBuf[dx*3+2]);
}
//
// Move pixelPtr at the beginning of the
// next line.
//
data = data + (RoundUp4(w * 2) - w * 2);
}
png_destroy_read_struct(&pngPtr, &infoPtr,NULL);
#ifdef DEBUG
*logofs << "DecompressPng16: Decompression finished."
<< dy << " lines handled.\n"
<< logofs_flush;
#endif
return 1;
}
int DecompressPng24(unsigned char *compressedData, int compressedLen,
unsigned int w, unsigned int h, unsigned char *dstBuf, int byteOrder)
{
static CARD8 *pixelPtr = NULL;
unsigned int dx, dy;
png_structp pngPtr;
png_infop infoPtr;
png_bytep rowPointers;
streamPos = 0;
pngPtr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!pngPtr)
{
#ifdef PANIC
*logofs << "DecompressPng24: PANIC! "
<< "Failed png_create_read_struct operation"
<< ".\n" << logofs_flush;
#endif
return -1;
}
infoPtr = png_create_info_struct(pngPtr);
if (!infoPtr)
{
#ifdef PANIC
*logofs << "DecompressPng24: PANIC! "
<< "Failed png_create_info_struct operation"
<< ".\n" << logofs_flush;
#endif
png_destroy_read_struct(&pngPtr, NULL, NULL);
return -1;
}
if (setjmp(png_jmpbuf(pngPtr)))
{
#ifdef PANIC
*logofs << "DecompressPng24: PANIC! "
<< "Error during IO initialization"
<< ".\n" << logofs_flush;
#endif
png_destroy_read_struct(&pngPtr, &infoPtr, NULL);
return -1;
}
png_set_read_fn(pngPtr, (void *)compressedData, PngReadData);
if (setjmp(png_jmpbuf(pngPtr)))
{
#ifdef PANIC
*logofs << "DecompressPng24: PANIC! "
<< "Error during read of PNG header"
<< ".\n" << logofs_flush;
#endif
png_destroy_read_struct(&pngPtr, &infoPtr, NULL);
return -1;
}
png_read_info( pngPtr, infoPtr ) ;
if (infoPtr -> color_type == PNG_COLOR_TYPE_PALETTE)
{
png_set_expand(pngPtr);
}
//
// PixelPtr points to dstBuf which is
// already padded correctly for the final
// image to put
//
pixelPtr = (CARD8 *) dstBuf;
rowPointers = (png_byte *)tmpBuf;
if (setjmp(png_jmpbuf(pngPtr)))
{
#ifdef PANIC
*logofs << "DecompressPng24: PANIC! "
<< "Error during read of PNG rows"
<< ".\n" << logofs_flush;
#endif
png_destroy_read_struct(&pngPtr, &infoPtr, NULL);
return -1;
}
for (dy = 0; dy < h; dy++)
{
png_read_row(pngPtr, rowPointers, NULL);
for (dx = 0; dx < w; dx++)
{
//
// Follow the server byte order when arranging data.
//
if (byteOrder == LSBFirst)
{
pixelPtr[0] = tmpBuf[dx * 3];
pixelPtr[1] = tmpBuf[dx * 3 + 1];
pixelPtr[2] = tmpBuf[dx * 3 + 2];
}
else
{
pixelPtr[2] = tmpBuf[dx * 3];
pixelPtr[1] = tmpBuf[dx * 3 + 1];
pixelPtr[0] = tmpBuf[dx * 3 + 2];
}
pixelPtr += 3;
}
//
// Go to the next line.
//
pixelPtr = (CARD8 *) (((char *) pixelPtr) + (RoundUp4(w * 3) - w * 3));
}
png_destroy_read_struct(&pngPtr, &infoPtr,NULL);
#ifdef DEBUG
*logofs << "DecompressPng24: Decompression finished."
<< dy << " lines handled.\n"
<< logofs_flush;
#endif
return 1;
}
int DecompressPng32(unsigned char *compressedData, int compressedLen,
unsigned int w, unsigned int h, unsigned char *dstBuf, int byteOrder)
{
unsigned char *data;
unsigned int dx, dy;
png_structp pngPtr;
png_infop infoPtr;
png_bytep rowPointers;
streamPos = 0;
pngPtr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!pngPtr)
{
#ifdef PANIC
*logofs << "DecompressPng32: PANIC! "
<< "Failed png_create_read_struct operation"
<< ".\n" << logofs_flush;
#endif
return -1;
}
infoPtr = png_create_info_struct(pngPtr);
if (!infoPtr)
{
#ifdef PANIC
*logofs << "DecompressPng32: PANIC! "
<< "Failed png_create_info_struct operation."
<< ".\n" << logofs_flush;
#endif
png_destroy_read_struct(&pngPtr, NULL, NULL);
return -1;
}
if (setjmp(png_jmpbuf(pngPtr)))
{
#ifdef PANIC
*logofs << "DecompressPng32: PANIC! "
<< "Error during IO initialization"
<< ".\n" << logofs_flush;
#endif
png_destroy_read_struct(&pngPtr, &infoPtr, NULL);
return -1;
}
png_set_read_fn(pngPtr, (void *)compressedData, PngReadData);
if (setjmp(png_jmpbuf(pngPtr)))
{
#ifdef PANIC
*logofs << "DecompressPng32: PANIC! "
<< "Error during read of PNG header"
<< ".\n" << logofs_flush;
#endif
png_destroy_read_struct(&pngPtr, &infoPtr, NULL);
return -1;
}
png_read_info(pngPtr, infoPtr) ;
if (infoPtr -> color_type == PNG_COLOR_TYPE_PALETTE)
{
png_set_expand(pngPtr);
}
//
// data points to dstBuf which is
// already padded correctly for the final
// image to put
//
data = dstBuf;
rowPointers = (png_byte *) tmpBuf;
if (setjmp(png_jmpbuf(pngPtr)))
{
#ifdef PANIC
*logofs << "DecompressPng32: PANIC! "
<< "Error during read of PNG rows"
<< ".\n" << logofs_flush;
#endif
png_destroy_read_struct(&pngPtr, &infoPtr, NULL);
return -1;
}
unsigned long pixel;
int i;
for (dy = 0; dy < h; dy++)
{
png_read_row(pngPtr, rowPointers, NULL);
for (dx = 0; dx < w; dx++)
{
pixel = RGB24_TO_PIXEL(32, tmpBuf[dx * 3], tmpBuf[dx * 3 + 1],
tmpBuf[dx * 3 + 2]);
//
// Follow the server byte order when arranging data.
//
if (byteOrder == LSBFirst)
{
for (i = 0; i < 4; i++)
{
data[i] = (unsigned char)(pixel & 0xff);
pixel >>= 8;
}
}
else
{
for (i = 3; i >= 0; i--)
{
data[i] = (unsigned char) (pixel & 0xff);
pixel >>= 8;
}
}
data += 4;
}
}
png_destroy_read_struct(&pngPtr, &infoPtr,NULL);
#ifdef DEBUG
*logofs << "DecompressPng32: Decompression finished."
<< dy << " lines handled.\n"
<< logofs_flush;
#endif
return 1;
}
static void PngReadData(png_structp png_ptr, png_bytep data, png_size_t length)
{
memcpy((char *) data, (char *) png_get_io_ptr(png_ptr) + streamPos, length);
streamPos += length;
}
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