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-rw-r--r--nxcomp/Jpeg.cpp875
1 files changed, 875 insertions, 0 deletions
diff --git a/nxcomp/Jpeg.cpp b/nxcomp/Jpeg.cpp
new file mode 100644
index 000000000..b3973227c
--- /dev/null
+++ b/nxcomp/Jpeg.cpp
@@ -0,0 +1,875 @@
+/**************************************************************************/
+/* */
+/* 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. */
+/* */
+/**************************************************************************/
+
+#include <X11/Xmd.h>
+
+#include <unistd.h>
+#include <setjmp.h>
+#include <zlib.h>
+
+#ifdef __cplusplus
+
+extern "C"
+{
+ #include <stdio.h>
+ #include <jpeglib.h>
+}
+
+#else
+
+#include <stdio.h>
+#include <jpeglib.h>
+
+#endif
+
+#include "Misc.h"
+#include "Jpeg.h"
+#include "Unpack.h"
+
+#define PANIC
+#define WARNING
+#undef TEST
+#undef DEBUG
+
+#define RGB24_TO_PIXEL(bpp,r,g,b) \
+ ((((CARD##bpp)(r) & 0xff) * srcRedMax + 127) / 255 \
+ << srcRedShift | \
+ (((CARD##bpp)(g) & 0xff) * srcGreenMax + 127) / 255 \
+ << srcGreenShift | \
+ (((CARD##bpp)(b) & 0xff) * srcBlueMax + 127) / 255 \
+ << srcBlueShift)
+
+#define RGB24_TO_PIXEL32(r,g,b) \
+ (((CARD32)(r) & 0xff) << srcRedShift | \
+ ((CARD32)(g) & 0xff) << srcGreenShift | \
+ ((CARD32)(b) & 0xff) << srcBlueShift)
+
+//
+// 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 jpeg decompression.
+//
+
+static void JpegSetSrcManager(j_decompress_ptr cinfo, CARD8 *compressedData, int compressedLen);
+static void JpegInitSource(j_decompress_ptr cinfo);
+static void JpegTermSource(j_decompress_ptr cinfo);
+static void JpegSkipInputData(j_decompress_ptr cinfo, long num_bytes);
+
+static boolean JpegFillInputBuffer(j_decompress_ptr cinfo);
+
+static int DecompressJpeg16(unsigned char *compressedData, int compressedLen,
+ unsigned int w, unsigned int h, unsigned char *dstBuf, int byteOrder);
+
+static int DecompressJpeg24(unsigned char *compressedData, int compressedLen,
+ unsigned int w, unsigned int h, unsigned char *dstBuf, int byteOrder);
+
+static int DecompressJpeg32(unsigned char *compressedData, int compressedLen,
+ unsigned int w, unsigned int h, unsigned char *dstBuf, int byteOrder);
+
+void UnpackJpegErrorHandler(j_common_ptr cinfo);
+
+//
+// Colormap stuff.
+//
+
+CARD16 srcRedMax, srcGreenMax, srcBlueMax;
+CARD8 srcRedShift, srcGreenShift, srcBlueShift;
+
+//
+// Error handler.
+//
+
+static bool jpegError;
+
+jmp_buf UnpackJpegContext;
+
+void UnpackJpegErrorHandler(j_common_ptr cinfo)
+{
+ #ifdef PANIC
+ *logofs << "UnpackJpegErrorHandler: PANIC! Detected error in JPEG decompression.\n"
+ << logofs_flush;
+
+ *logofs << "UnpackJpegErrorHandler: PANIC! Trying to revert to the previous context.\n"
+ << logofs_flush;
+ #endif
+
+ jpegError = 1;
+
+ longjmp(UnpackJpegContext, 1);
+}
+
+//
+// Attributes used for the jpeg decompression.
+//
+
+static struct jpeg_source_mgr jpegSrcManager;
+static JOCTET *jpegBufferPtr;
+static size_t jpegBufferLen;
+
+static char *tmpBuf;
+static int tmpBufSize = 0;
+
+int UnpackJpeg(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 << "UnpackJpeg: WARNING! Skipping unpack of dummy data.\n"
+ << logofs_flush;
+ #endif
+
+ return -1;
+ }
+
+ #ifdef DEBUG
+ *logofs << "UnpackJpeg: Decompression. Source size "
+ << srcSize << " bits per plane " << dstBpp
+ << ".\n" << logofs_flush;
+ #endif
+
+ srcRedShift = ffs(geometry -> red_mask) - 1;
+ srcGreenShift = ffs(geometry -> green_mask) - 1;
+ srcBlueShift = ffs(geometry -> blue_mask) - 1;
+
+ #ifdef DEBUG
+ *logofs << "UnpackJpeg: Red shift " << (int) srcRedShift
+ << " green shift " << (int) srcGreenShift << " blue shift "
+ << (int) srcBlueShift << ".\n" << logofs_flush;
+ #endif
+
+ srcRedMax = geometry -> red_mask >> srcRedShift;
+ srcGreenMax = geometry -> green_mask >> srcGreenShift;
+ srcBlueMax = geometry -> blue_mask >> srcBlueShift;
+
+ #ifdef DEBUG
+ *logofs << "UnpackJpeg: Red mask " << (void *) geometry -> red_mask
+ << " green mask " << (void *) geometry -> green_mask
+ << " blue mask " << (void *) geometry -> blue_mask
+ << ".\n" << logofs_flush;
+ #endif
+
+ #ifdef DEBUG
+ *logofs << "UnpackJpeg: Red max " << srcRedMax << " green max "
+ << srcGreenMax << " blue max " << srcBlueMax
+ << ".\n" << logofs_flush;
+ #endif
+
+ //
+ // Make enough space in the temporary
+ // buffer to have one complete row of
+ // the image with 3 bytes for a pixel.
+ //
+
+ tmpBufSize = dstWidth * 3;
+ tmpBuf = new char[tmpBufSize];
+
+ if (tmpBuf == NULL)
+ {
+ #ifdef PANIC
+ *logofs << "UnpackJpeg: PANIC! Cannot allocate "
+ << dstWidth * 3 << " bytes for Jpeg "
+ << "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;
+ }
+
+ break;
+ }
+ case 16:
+ {
+ result = DecompressJpeg16(srcData, srcSize, dstWidth,
+ dstHeight, dstData, byteOrder);
+ break;
+ }
+ case 24:
+ {
+ result = DecompressJpeg24(srcData, srcSize, dstWidth,
+ dstHeight, dstData, byteOrder);
+ break;
+ }
+ case 32:
+ {
+ result = DecompressJpeg32(srcData, srcSize, dstWidth,
+ dstHeight, dstData, byteOrder);
+ break;
+ }
+ default:
+ {
+ #ifdef PANIC
+ *logofs << "UnpackJpeg: PANIC! Failed to decode Jpeg image. "
+ << " Unsupported Bpp value " << dstBpp
+ << " for the Jpeg compression"
+ << ".\n" << logofs_flush;
+ #endif
+
+ delete [] tmpBuf;
+
+ result = -1;
+ }
+ }
+
+ #ifdef DEBUG
+ *logofs << "UnpackJpeg: Decompression finished with result "
+ << result << ".\n" << logofs_flush;
+ #endif
+
+ if (result == -1)
+ {
+ delete [] tmpBuf;
+
+ #ifdef PANIC
+ *logofs << "UnpackJpeg: PANIC! Failed to decode Jpeg image using "
+ << dstBpp << " Bpp destination.\n" << logofs_flush;
+ #endif
+
+ return result;
+ }
+
+ //
+ // Apply the correction for the brightness.
+ //
+
+ int maskMethod;
+
+ switch(method)
+ {
+ case PACK_JPEG_8_COLORS:
+ {
+ maskMethod = MASK_8_COLORS;
+
+ break;
+ }
+ case PACK_JPEG_64_COLORS:
+ {
+ maskMethod = MASK_64_COLORS;
+
+ break;
+ }
+ case PACK_JPEG_256_COLORS:
+ {
+ maskMethod = MASK_256_COLORS;
+
+ break;
+ }
+ case PACK_JPEG_512_COLORS:
+ {
+ maskMethod = MASK_512_COLORS;
+
+ break;
+ }
+ case PACK_JPEG_4K_COLORS:
+ {
+ maskMethod = MASK_4K_COLORS;
+
+ break;
+ }
+ case PACK_JPEG_32K_COLORS:
+ {
+ maskMethod = MASK_32K_COLORS;
+
+ break;
+ }
+ case PACK_JPEG_64K_COLORS:
+ {
+ maskMethod = MASK_64K_COLORS;
+
+ break;
+ }
+ case PACK_JPEG_256K_COLORS:
+ {
+ maskMethod = MASK_256K_COLORS;
+
+ break;
+ }
+ case PACK_JPEG_2M_COLORS:
+ {
+ maskMethod = MASK_2M_COLORS;
+
+ break;
+ }
+ case PACK_JPEG_16M_COLORS:
+ {
+ maskMethod = MASK_16M_COLORS;
+
+ break;
+ }
+ default:
+ {
+ 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:
+ {
+ delete [] tmpBuf;
+
+ return -1;
+ }
+ }
+
+ delete [] tmpBuf;
+
+ return 1;
+}
+
+//
+// Functions that actually do the Jpeg decompression.
+//
+
+int DecompressJpeg16(unsigned char *compressedData, int compressedLen,
+ unsigned int w, unsigned int h, unsigned char *dstBuf, int byteOrder)
+{
+ struct jpeg_decompress_struct cinfo;
+ struct jpeg_error_mgr jerr;
+ unsigned char *data;
+ JSAMPROW rowPointer[1];
+
+ unsigned int dx = 0;
+ unsigned int dy = 0;
+
+ #ifdef DEBUG
+ *logofs << "DecompressJpeg16: Decompressing with length "
+ << compressedLen << " width " << w << " height "
+ << h << ".\n" << logofs_flush;
+ #endif
+
+ jpegError = 0;
+
+ cinfo.err = jpeg_std_error(&jerr);
+
+ jerr.error_exit = UnpackJpegErrorHandler;
+
+ if (setjmp(UnpackJpegContext) == 1)
+ {
+ #ifdef TEST
+ *logofs << "DecompressJpeg16: Out of the long jump with error '"
+ << jpegError << "'.\n" << logofs_flush;
+ #endif
+
+ goto AbortDecompressJpeg16;
+ }
+
+ jpeg_create_decompress(&cinfo);
+
+ if (jpegError) goto AbortDecompressJpeg16;
+
+ JpegSetSrcManager(&cinfo, compressedData, compressedLen);
+
+ jpeg_read_header(&cinfo, 1);
+
+ if (jpegError) goto AbortDecompressJpeg16;
+
+ cinfo.out_color_space = JCS_RGB;
+
+ jpeg_start_decompress(&cinfo);
+
+ if (jpegError) goto AbortDecompressJpeg16;
+
+ if (cinfo.output_width != w ||
+ cinfo.output_height != h ||
+ cinfo.output_components != 3)
+ {
+ #ifdef PANIC
+ *logofs << "DecompressJpeg16: PANIC! Wrong JPEG data received.\n"
+ << logofs_flush;
+ #endif
+
+ jpeg_destroy_decompress(&cinfo);
+
+ return -1;
+ }
+
+ //
+ // PixelPtr points to dstBuf which is
+ // already padded correctly for the final
+ // image to put
+ //
+
+ data = dstBuf;
+
+ rowPointer[0] = (JSAMPROW) tmpBuf;
+
+ unsigned long pixel;
+
+ while (cinfo.output_scanline < cinfo.output_height)
+ {
+ jpeg_read_scanlines(&cinfo, rowPointer, 1);
+
+ if (jpegError) goto AbortDecompressJpeg16;
+
+ 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 data at the beginning of the
+ // next line.
+ //
+
+ data = data + (RoundUp4(w * 2) - w * 2);
+
+ dy++;
+ }
+
+ AbortDecompressJpeg16:
+
+ if (jpegError == 0)
+ {
+ jpeg_finish_decompress(&cinfo);
+ }
+
+ jpeg_destroy_decompress(&cinfo);
+
+ if (jpegError == 1)
+ {
+ #ifdef PANIC
+ *logofs << "DecompressJpeg16: Failed to decompress JPEG image.\n"
+ << logofs_flush;
+ #endif
+
+ return -1;
+ }
+
+ #ifdef TEST
+ *logofs << "DecompressJpeg16: Decompression finished with "
+ << dy << " lines handled.\n" << logofs_flush;
+ #endif
+
+ return 1;
+}
+
+int DecompressJpeg24(unsigned char *compressedData, int compressedLen,
+ unsigned int w, unsigned int h, unsigned char *dstBuf, int byteOrder)
+{
+ struct jpeg_decompress_struct cinfo;
+ struct jpeg_error_mgr jerr;
+ CARD8 *pixelPtr = NULL;
+ JSAMPROW rowPointer[1];
+
+ unsigned int dx = 0;
+ unsigned int dy = 0;
+
+ #ifdef TEST
+ *logofs << "DecompressJpeg24: Decompressing with length "
+ << compressedLen << " width " << w << " height "
+ << h << ".\n" << logofs_flush;
+ #endif
+
+ jpegError = 0;
+
+ cinfo.err = jpeg_std_error(&jerr);
+
+ jerr.error_exit = UnpackJpegErrorHandler;
+
+ if (setjmp(UnpackJpegContext) == 1)
+ {
+ #ifdef TEST
+ *logofs << "DecompressJpeg24: Out of the long jump with error '"
+ << jpegError << "'.\n" << logofs_flush;
+ #endif
+
+ goto AbortDecompressJpeg24;
+ }
+
+ jpeg_create_decompress(&cinfo);
+
+ if (jpegError) goto AbortDecompressJpeg24;
+
+ JpegSetSrcManager(&cinfo, compressedData, compressedLen);
+
+ jpeg_read_header(&cinfo, 1);
+
+ if (jpegError) goto AbortDecompressJpeg24;
+
+ cinfo.out_color_space = JCS_RGB;
+
+ jpeg_start_decompress(&cinfo);
+
+ if (jpegError) goto AbortDecompressJpeg24;
+
+ if (cinfo.output_width != w ||
+ cinfo.output_height != h ||
+ cinfo.output_components != 3)
+ {
+ #ifdef PANIC
+ *logofs << "DecompressJpeg24: PANIC! Wrong JPEG data received.\n"
+ << logofs_flush;
+ #endif
+
+ jpeg_destroy_decompress(&cinfo);
+
+ return -1;
+ }
+
+ //
+ // PixelPtr points to dstBuf which is
+ // already padded correctly for the final
+ // image to put.
+ //
+
+ pixelPtr = (CARD8 *) dstBuf;
+
+ rowPointer[0] = (JSAMPROW) tmpBuf;
+
+ while (cinfo.output_scanline < cinfo.output_height)
+ {
+ jpeg_read_scanlines(&cinfo, rowPointer, 1);
+
+ if (jpegError) goto AbortDecompressJpeg24;
+
+ 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));
+
+ dy++;
+ }
+
+ AbortDecompressJpeg24:
+
+ if (jpegError == 0)
+ {
+ jpeg_finish_decompress(&cinfo);
+ }
+
+ jpeg_destroy_decompress(&cinfo);
+
+ if (jpegError == 1)
+ {
+ #ifdef PANIC
+ *logofs << "DecompressJpeg24: Failed to decompress JPEG image.\n"
+ << logofs_flush;
+ #endif
+
+ return -1;
+ }
+
+ #ifdef TEST
+ *logofs << "DecompressJpeg24: Decompression finished with "
+ << dy << " lines handled.\n" << logofs_flush;
+ #endif
+
+ return 1;
+}
+
+int DecompressJpeg32(unsigned char *compressedData, int compressedLen,
+ unsigned int w, unsigned int h, unsigned char *dstBuf, int byteOrder)
+{
+ struct jpeg_decompress_struct cinfo;
+ struct jpeg_error_mgr jerr;
+ unsigned char *data;
+ JSAMPROW rowPointer[1];
+
+ unsigned int dx = 0;
+ unsigned int dy = 0;
+
+ #ifdef TEST
+ *logofs << "DecompressJpeg32: Decompressing with length "
+ << compressedLen << " width " << w << " height "
+ << h << ".\n" << logofs_flush;
+ #endif
+
+ jpegError = 0;
+
+ cinfo.err = jpeg_std_error(&jerr);
+
+ jerr.error_exit = UnpackJpegErrorHandler;
+
+ if (setjmp(UnpackJpegContext) == 1)
+ {
+ #ifdef TEST
+ *logofs << "DecompressJpeg32: Out of the long jump with error '"
+ << jpegError << "'.\n" << logofs_flush;
+ #endif
+
+ goto AbortDecompressJpeg32;
+ }
+
+ jpeg_create_decompress(&cinfo);
+
+ if (jpegError) goto AbortDecompressJpeg32;
+
+ JpegSetSrcManager(&cinfo, compressedData, compressedLen);
+
+ jpeg_read_header(&cinfo, 1);
+
+ if (jpegError) goto AbortDecompressJpeg32;
+
+ cinfo.out_color_space = JCS_RGB;
+
+ jpeg_start_decompress(&cinfo);
+
+ if (jpegError) goto AbortDecompressJpeg32;
+
+ if (cinfo.output_width != w ||
+ cinfo.output_height != h ||
+ cinfo.output_components != 3)
+ {
+ #ifdef PANIC
+ *logofs << "DecompressJpeg32 : PANIC! Wrong JPEG data received.\n"
+ << logofs_flush;
+ #endif
+
+ jpeg_destroy_decompress(&cinfo);
+
+ return -1;
+ }
+
+ //
+ // PixelPtr points to dstBuf which is
+ // already padded correctly for the final
+ // image to put
+ //
+
+ data = dstBuf;
+
+ rowPointer[0] = (JSAMPROW) tmpBuf;
+
+ unsigned long pixel;
+
+ int i;
+
+ while (cinfo.output_scanline < cinfo.output_height)
+ {
+ jpeg_read_scanlines(&cinfo, rowPointer, 1);
+
+ if (jpegError) goto AbortDecompressJpeg32;
+
+ 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;
+ }
+
+ dy++;
+ }
+
+ AbortDecompressJpeg32:
+
+ if (jpegError == 0)
+ {
+ jpeg_finish_decompress(&cinfo);
+ }
+
+ jpeg_destroy_decompress(&cinfo);
+
+ if (jpegError == 1)
+ {
+ #ifdef PANIC
+ *logofs << "DecompressJpeg32: Failed to decompress JPEG image.\n"
+ << logofs_flush;
+ #endif
+
+ return -1;
+ }
+
+ #ifdef TEST
+ *logofs << "DecompressJpeg32: Decompression finished with "
+ << dy << " lines handled.\n" << logofs_flush;
+ #endif
+
+ return 1;
+}
+
+static void JpegInitSource(j_decompress_ptr cinfo)
+{
+ jpegError = 0;
+}
+
+static boolean JpegFillInputBuffer(j_decompress_ptr cinfo)
+{
+ jpegError = 1;
+
+ jpegSrcManager.bytes_in_buffer = jpegBufferLen;
+ jpegSrcManager.next_input_byte = (JOCTET *)jpegBufferPtr;
+
+ return 1;
+}
+
+static void JpegSkipInputData(j_decompress_ptr cinfo, long num_bytes)
+{
+ if (num_bytes < 0 || (unsigned long) num_bytes > jpegSrcManager.bytes_in_buffer)
+ {
+ jpegError = 1;
+
+ jpegSrcManager.bytes_in_buffer = jpegBufferLen;
+ jpegSrcManager.next_input_byte = (JOCTET *)jpegBufferPtr;
+ }
+ else
+ {
+ jpegSrcManager.next_input_byte += (size_t) num_bytes;
+ jpegSrcManager.bytes_in_buffer -= (size_t) num_bytes;
+ }
+}
+
+static void JpegTermSource(j_decompress_ptr cinfo)
+{
+}
+
+static void JpegSetSrcManager(j_decompress_ptr cinfo,
+ CARD8 *compressedData,
+ int compressedLen)
+{
+ jpegBufferPtr = (JOCTET *) compressedData;
+ jpegBufferLen = (size_t) compressedLen;
+
+ jpegSrcManager.init_source = JpegInitSource;
+ jpegSrcManager.fill_input_buffer = JpegFillInputBuffer;
+ jpegSrcManager.skip_input_data = JpegSkipInputData;
+ jpegSrcManager.resync_to_restart = jpeg_resync_to_restart;
+ jpegSrcManager.term_source = JpegTermSource;
+ jpegSrcManager.next_input_byte = jpegBufferPtr;
+ jpegSrcManager.bytes_in_buffer = jpegBufferLen;
+
+ cinfo->src = &jpegSrcManager;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-09 08:27:42 +0000