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jpgextract.c
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jpgextract.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void extract(char *file_path);
int fpeekc(FILE *fp);
void help_menu();
int main(int argc, char *argv[])
{
if (argc != 2)
{
help_menu();
exit(1);
}
if (strcmp(argv[1], "-h") == 0)
{
help_menu();
exit(1);
}
extract(argv[1]);
return 0;
}
void extract(char *file_path)
{
FILE *fp = fopen(file_path, "r");
if (fp == NULL)
{
fprintf(stderr, "Error opening cache file %s\n", file_path);
exit(1);
}
int ch, i = 0;
printf("Extracting images...\n");
while ((ch = fgetc(fp)) != EOF)
{
if (ch == 0xFF && fpeekc(fp) == 0xD8)
{
char filename[10];
snprintf(filename, 10, "%d", i);
strcat(filename, ".jpg");
FILE *img_fp = fopen(filename, "w");
if (img_fp == NULL)
{
fprintf(stderr, "Error creating image file %s\n", filename);
fclose(fp);
exit(1);
}
while (!(ch == 0xFF && fpeekc(fp) == 0xD9) && ch != EOF)
{
fputc(ch, img_fp);
ch = fgetc(fp);
}
fputc(ch, img_fp);
fputc((ch = fgetc(fp)), img_fp);
fclose(img_fp);
i++;
}
}
fclose(fp);
printf("%d jpgs extracted.\n", i + 1);
}
int fpeekc(FILE *fp)
{
int c;
c = fgetc(fp);
ungetc(c, fp);
return c;
}
void help_menu()
{
printf("Usage: jpgextract [file_path].\n");
}