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-rw-r--r--nxcomp/Pgn.cpp794
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diff --git a/nxcomp/Pgn.cpp b/nxcomp/Pgn.cpp
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--- /dev/null
+++ b/nxcomp/Pgn.cpp
@@ -0,0 +1,794 @@
+/**************************************************************************/
+/* */
+/* Copyright (c) 2001, 2010 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]);
+
+ //
+ // Follow the server byte order when arranging data.
+ //
+
+ if (byteOrder == LSBFirst)
+ {
+ data[0] = (unsigned char) (pixel & 0xff);
+ data[1] = (unsigned char) ((pixel >> 8) & 0xff);
+ }
+ else
+ {
+ data[1] = (unsigned char) (pixel & 0xff);
+ data[0] = (unsigned char) ((pixel >> 8) & 0xff);
+ }
+
+ data += 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;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-19 23:10:49 +0000