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/*
* headstripper
* File: main.c
* (c) 2019 Jonas Gunz himself(at)jonasgunz.de
*
* License: MIT
* */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
//SWAPPED
#define _MAGIC_JPG 0xD8FF //JPG Magic Value
#define _MAGIC_BMP 0x4D42 //BMP Magic Value
//JPG
#define _JPG_EXIF 0xE1
#define _JPG_COM 0xFE
#define _JPG_COPY 0xEE
#define _JPG_SOS 0xDA
#define _JPG_EOI 0xD9
void strip_jpg(char *_filename);
int main(int argc, char* argv[])
{
FILE *image;
uint16_t magic;
if(argc != 2)
{
printf("Wrong number of arguments!\nUsage: %s <Filename>\n", argv[0]);
exit(1);
}
{
image = fopen(argv[1], "r");
if(!image)
{
printf("Unable to open %s\n", argv[1]);
exit(2);
}
fread(&magic, 2, 1, image);
fclose(image);
}
printf("Magic Value: %X\n", magic);
switch(magic)
{
case _MAGIC_JPG:
printf("Detected JPG\n");
strip_jpg(argv[1]);
break;
default:
printf("Unknown filetype.\n");
exit(1);
break;
};
return 0;
}
void strip_jpg(char *_filename)
{
FILE *in;
FILE *out;
int f__outfile_len = strlen(_filename);
char *f__outfile = malloc(f__outfile_len + 8);
strcpy( f__outfile, _filename);
strcpy(&f__outfile[f__outfile_len], ".strip\0");
in = fopen(_filename, "r");
out = fopen(f__outfile, "w");
//Feelin' lazy. Might add debug later, idk
if(!in)
exit(1);
if(!out)
exit(1);
while(1)
{
unsigned char c = fgetc(in);
if(c == 0xFF)
{
unsigned char c2 = fgetc(in);
if( c2 == _JPG_EXIF || c2 == _JPG_COM || c2 == _JPG_COPY ) //Add tags here
{
unsigned char c3 = fgetc(in);
unsigned char c4 = fgetc(in);
uint16_t seg_len = (( c3 << 8 ) & 0xff00) + c4;
printf("SEG %X SEGLEN %uB\n", c2, seg_len);
seg_len -= 2; //2B are already read!
for (uint16_t i = 0; i < seg_len; i++)
{
fgetc(in);
}
}
else if ( c2 == _JPG_EOI )
{
printf("ENDSEG\n");
fputc(c, out);
fputc(c2, out);
break;
}
else
{
fputc(c, out);
fputc(c2, out);
}
}
else
fputc(c, out);
if(feof(in))
break;
}
fclose(in);
fclose(out);
free(f__outfile);
}
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