106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
/* vim:expandtab:ts=2 sw=2:
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*/
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/* Grafx2 - The Ultimate 256-color bitmap paint program
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* Gif Analyzer tool
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Copyright 2010 Adrien Destugues
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Grafx2 is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2
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of the License.
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Grafx2 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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You should have received a copy of the GNU General Public License
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along with Grafx2; if not, see <http://www.gnu.org/licenses/>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <math.h>
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int main(int argc, char* argv[])
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{
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FILE* theFile;
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uint8_t buffer[256];
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uint16_t w,h;
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if(argc < 2)
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{
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printf("%s file.gif\n",argv[0]);
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exit(-1);
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}
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theFile = fopen(argv[1], "r");
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if (theFile == NULL)
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{
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fprintf(stderr, "Failed to open file '%s'.\n", argv[1]);
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exit(1);
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}
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fread(buffer, 1, 6, theFile);
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buffer[6] = 0;
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printf("Signature: %6s\n", buffer);
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fread(&w,2,1,theFile);
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fread(&h,2,1,theFile);
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printf("Resolution: %dx%d\n",w,h);
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fread(buffer,1,3,theFile);
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int colors = 1 << (((buffer[0] & 0x70)>>4)+1); // 0x70 == 0b01110000
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int color_table_size = 1 << ((buffer[0]&0x7)+1);
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printf("Color palette: 0x%02x\n",buffer[0]&0xFF);
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if (buffer[0] & 0x80) { // 0x80 == 0b10000000
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printf("\tGlobal palette");
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if(buffer[0] & 0x08) // 0x08 == 0b00001000
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printf(" SORTED");
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printf("\n");
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}
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printf("\tColor count: %d\n", colors);
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printf("\tSize of color table : %d\t", color_table_size);
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printf("Index of background color: %d\n",buffer[1]);
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printf("pixel aspect ratio = %d\n",buffer[2]);
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if(buffer[2] != 0) printf("\t aspect ratio = %d/64\n", 15 + buffer[2]);
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printf("Color palette:\n");
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for (int i = 0; i < color_table_size; i++)
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{
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fread(buffer,1,3,theFile);
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/*printf("\t%d: %u %u %u\t",i,buffer[0], buffer[1], buffer[2]);*/
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printf(" %3d: #%02x%02x%02x",i,buffer[0], buffer[1], buffer[2]);
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if ((i+1)%8 ==0)puts("");
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}
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int i = 0;
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do {
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fread(buffer,1,1,theFile);
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i++;
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} while (buffer[0] != ',');
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if (i > 1)
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printf("Skipped %d meaningless bytes before image descriptor\n",i);
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uint16_t x,y;
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fread(&x,2,1,theFile);
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fread(&y,2,1,theFile);
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fread(&w,2,1,theFile);
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fread(&h,2,1,theFile);
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printf("Image descriptor\n");
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printf("\tx=%d y=%d w=%d h=%d\n",x,y,w,h);
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fclose(theFile);
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}
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