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/* |
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rdesktop: A Remote Desktop Protocol client. |
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Bitmap decompression routines |
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Copyright (C) Matthew Chapman 1999-2000 |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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|
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#include "includes.h" |
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#include <fcntl.h> |
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|
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#define BITMAP_DEBUG 1 |
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|
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#if BITMAP_DEBUG |
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void hexdump(char *filename, unsigned char *data, int length); |
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#endif |
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|
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#define RCVAL() (*(input++)) |
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#define RSVAL() ((*((input++) + 1) << 8) | RCVAL()) |
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#define SCVAL(v) {*(output++) = (v);} |
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|
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#define FILL() {while (n-- > 0) { if (output - start < width) { SCVAL(0) } else { SCVAL(*(output-width)); }}} |
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#define MIX() {while (n-- > 0) { if (output - start < width) { SCVAL(mix) } else { SCVAL(*(output-width) ^ mix); }}} |
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#define COPY() {while (n-- > 0) { SCVAL(RCVAL()); }} |
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#define COLOR() {int color = RCVAL(); \ |
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while (n-- > 0) { SCVAL(color); }} |
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#define BICOLOR() {int color1 = RCVAL(); int color2 = RCVAL(); \ |
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while (n-- > 0) { SCVAL(color1); SCVAL(color2); }} |
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#define SETMIX_MIX() {mix = RCVAL(); MIX();} |
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#define COPY_PACKED() {n++; n/=2; while (n-- > 0) \ |
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{unsigned char c = RCVAL(); SCVAL((c & 0xF0) >> 4); \ |
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SCVAL(c & 0x0F); }} |
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|
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BOOL bitmap_decompress(unsigned char *input, int size, |
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unsigned char *output, int width) |
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{ |
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unsigned char *savedinput = input; |
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unsigned char *start = output; |
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unsigned char *end = input + size; |
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unsigned char code; |
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unsigned char mix = 0xFF; |
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int n, savedn; |
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|
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while (input < end) |
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{ |
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code = RCVAL(); |
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switch (code) |
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{ |
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case 0x00: // Fill |
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n = RCVAL() + 32; |
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FILL(); |
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break; |
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case 0xF0: // Fill |
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n = RSVAL(); |
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FILL(); |
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break; |
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case 0x20: // Mix |
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n = RCVAL() + 32; |
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MIX(); |
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break; |
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case 0xF1: // Mix |
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n = RSVAL(); |
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MIX(); |
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break; |
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case 0x40: // FillOrMix |
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fprintf(stderr, "FillOrMix unsupported\n"); |
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savedn = n = RCVAL() + 1; |
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MIX(); |
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input += (savedn+7)/8; |
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break; |
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case 0xF2: |
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fprintf(stderr, "FillOrMix unsupported\n"); |
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savedn = n = RSVAL(); |
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MIX(); |
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input += (savedn+7)/8; |
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break; |
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case 0x60: // Color |
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n = RCVAL() + 32; |
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COLOR(); |
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break; |
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case 0xF3: |
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n = RSVAL(); |
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fprintf(stderr, "Color %d\n", n); |
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COLOR(); |
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break; |
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case 0x80: // Copy |
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n = RCVAL() + 32; |
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COPY(); |
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break; |
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case 0xF4: |
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n = RSVAL(); |
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COPY(); |
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break; |
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case 0xA0: // Copy Packed |
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fprintf(stderr, "CopyPacked 1\n"); |
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n = RCVAL() + 32; |
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COPY_PACKED(); |
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break; |
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case 0xF5: |
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fprintf(stderr, "CopyPacked 2\n"); |
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n = RSVAL(); |
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COPY_PACKED(); |
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break; |
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case 0xC0: // SetMix_Mix |
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fprintf(stderr, "SetMix_Mix 1\n"); |
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n = RCVAL() + 16; |
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SETMIX_MIX(); |
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break; |
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case 0xF6: |
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fprintf(stderr, "SetMix_Mix 2\n"); |
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n = RSVAL(); |
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SETMIX_MIX(); |
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break; |
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case 0xD0: // SetMix_FillOrMix |
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fprintf(stderr, "SetMix_FillOrMix unsupported\n"); |
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savedn = n = RCVAL() + 1; |
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SETMIX_MIX(); |
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input += (savedn+7)/8; |
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break; |
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case 0xF7: |
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fprintf(stderr, "SetMix_FillOrMix unsupported\n"); |
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savedn = n = RSVAL(); |
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SETMIX_MIX(); |
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input += (savedn+7)/8; |
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break; |
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case 0xE0: // Bicolor |
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fprintf(stderr, "Bicolor 1\n"); |
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n = RCVAL() + 16; |
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BICOLOR(); |
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break; |
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case 0xF8: |
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fprintf(stderr, "Bicolor 2\n"); |
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n = RSVAL(); |
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BICOLOR(); |
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break; |
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case 0xF9: // FillOrMix_1 |
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fprintf(stderr, "FillOrMix_1 unsupported\n"); |
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return False; |
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case 0xFA: // FillOrMix_2 |
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fprintf(stderr, "FillOrMix_2 unsupported\n"); |
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return False; |
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case 0xFD: // White |
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SCVAL(0xFF); |
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break; |
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case 0xFE: // Black |
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SCVAL(0); |
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break; |
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default: |
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n = code & 31; |
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|
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if (n == 0) |
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{ |
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fprintf(stderr, "Undefined escape 0x%X\n", code); |
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return False; |
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} |
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|
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switch ((code >> 5) & 7) |
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{ |
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case 0: // Fill |
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FILL(); |
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break; |
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case 1: // Mix |
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MIX(); |
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break; |
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case 2: // FillOrMix |
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fprintf(stderr, "FillOrMix unsupported\n"); |
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n *= 8; |
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savedn = n; |
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MIX(); |
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input += (savedn+7)/8; |
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break; |
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case 3: // Color |
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COLOR(); |
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break; |
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case 4: // Copy |
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COPY(); |
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break; |
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case 5: // Copy Packed |
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fprintf(stderr, "CopyPacked 3\n"); |
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COPY_PACKED(); |
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break; |
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case 6: |
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n = code & 15; |
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|
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switch ((code >> 4) & 15) |
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{ |
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case 0xC: |
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fprintf(stderr, "SetMix_Mix 3\n"); |
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SETMIX_MIX(); |
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break; |
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case 0xD: |
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fprintf(stderr, "SetMix_FillOrMix unsupported\n"); |
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n *= 8; |
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savedn = n; |
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SETMIX_MIX(); |
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input += (savedn+7)/8; |
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break; |
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case 0xE: |
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fprintf(stderr, "Bicolor 3\n"); |
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BICOLOR(); |
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break; |
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default: |
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fprintf(stderr, "Undefined escape 0x%X\n", code); |
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return False; |
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} |
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} |
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} |
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} |
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|
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printf("Uncompressed size: %d\n", output - start); |
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#if BITMAP_DEBUG |
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{ |
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static int bmpno = 1; |
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char filename[64]; |
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|
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snprintf(filename, sizeof(filename)-1, "in%d.raw", bmpno); |
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hexdump(filename, savedinput, size); |
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|
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snprintf(filename, sizeof(filename)-1, "out%d.raw", bmpno); |
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hexdump(filename, start, output-start); |
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|
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bmpno++; |
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} |
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#endif |
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|
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return True; |
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} |
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|
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|
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#if BITMAP_DEBUG |
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void hexdump(char *filename, unsigned char *data, int length) |
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{ |
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/* |
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int i; |
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|
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for (i = 0; i < length; i++) |
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{ |
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printf("%02X ", data[i]); |
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|
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if (i % 16 == 15) |
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printf("\n"); |
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} |
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*/ |
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|
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int fd; |
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|
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fd = open(filename, O_WRONLY|O_CREAT, 0600); |
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write(fd, data, length); |
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close(fd); |
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} |
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#endif |
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