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reorganize gifanalyzer.c

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This commit is contained in:
Thomas Bernard 2018-01-30 14:27:20 +01:00
parent 8c029c5993
commit 0f780f1e3f
1 changed files with 49 additions and 11 deletions
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60
tools/gifanalyzer/gifanalyzer.c
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@ -3,6 +3,7 @@
/* Grafx2 - The Ultimate 256-color bitmap paint program
* Gif Analyzer tool
Copyright 2018 Thomas Bernard
Copyright 2010 Adrien Destugues
Grafx2 is free software; you can redistribute it and/or
@ -22,14 +23,15 @@
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <math.h>
static void read_image(FILE * theFile);
static void read_palette(FILE * theFile, int count);
int main(int argc, char* argv[])
{
FILE* theFile;
uint8_t buffer[256];
uint16_t w,h;
uint16_t x,y;
if(argc < 2)
{
@ -74,35 +76,71 @@ int main(int argc, char* argv[])
if(buffer[2] != 0) printf("\t aspect ratio = %d/64\n", 15 + buffer[2]);
printf("Color palette:\n");
for (int i = 0; i < color_table_size; i++)
{
fread(buffer,1,3,theFile);
/*printf("\t%d: %u %u %u\t",i,buffer[0], buffer[1], buffer[2]);*/
printf(" %3d: #%02x%02x%02x",i,buffer[0], buffer[1], buffer[2]);
if ((i+1)%8 ==0)puts("");
}
read_palette(theFile, color_table_size);
int i = 0;
do {
fread(buffer,1,1,theFile);
printf("%02X ", buffer[0]);
i++;
} while (buffer[0] != ',');
printf("\n");
if (i > 1)
printf("Skipped %d meaningless bytes before image descriptor\n",i);
read_image(theFile);
fclose(theFile);
}
static void read_image(FILE * theFile)
{
uint8_t buffer[256];
uint16_t x,y;
uint16_t w,h;
unsigned long total_bytes = 0, chunk_count = 0;
int color_table_size;
fread(&x,2,1,theFile);
fread(&y,2,1,theFile);
fread(&w,2,1,theFile);
fread(&h,2,1,theFile);
fread(buffer,1,1,theFile);
color_table_size = 1 << ((buffer[0]&0x07)+1);
printf("Image descriptor\n");
printf("\tx=%d y=%d w=%d h=%d\n",x,y,w,h);
printf("\t%sLocal Color Table (%d colors) %sSorted, %s\n",
(buffer[0]&0x80)?"":"No ", 1 << ((buffer[0]&0x07)+1),
(buffer[0]&0x80)?"":"No ", color_table_size,
(buffer[0]&0x20)?"":"Not ",
(buffer[0]&0x40)?"Interlaced":"Progressive");
fclose(theFile);
if (buffer[0]&0x80)
read_palette(theFile, color_table_size);
while (!feof(theFile))
{
fread(buffer,1,1,theFile);
if (buffer[0] == 0)
break;
fread(buffer+1,1,buffer[0],theFile);
total_bytes += buffer[0];
chunk_count++;
}
printf(" %lu bytes in %lu chunks\n", total_bytes, chunk_count);
}
static void read_palette(FILE * theFile, int count)
{
uint8_t buffer[3];
int i;
for (i = 0; i < count; i++)
{
fread(buffer,1,3,theFile);
/*printf("\t%d: %u %u %u\t",i,buffer[0], buffer[1], buffer[2]);*/
printf(" %3d: #%02x%02x%02x",i,buffer[0], buffer[1], buffer[2]);
if ((i+1)%8 ==0)puts("");
}
}