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id3-images.c
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id3-images.c
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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#if defined(_WIN32)
# include <io.h>
# define F_OK 0
#else
# include <unistd.h>
#endif
#include "id3v2.h"
#define NAME "id3-images"
/*
minimalistic program to extract cover art situated in ID3v2 tags
copyright (c) 2015 Marc R. Schoolderman <[email protected]>
use, modification, copying and distribution of this software is permitted
under the conditions described in the file 'COPYING'.
*/
static const char* picture_types[] = {
"other",
"icon",
"other_icon",
"front_cover",
"back_cover",
"leaflet",
"media",
"lead_artist",
"artist",
"conductor",
"band",
"composer",
"lyricist",
"location",
"recording",
"performance",
"screencap",
"red_herring",
"illustration",
"logotype",
"studio_logotype"
};
static void Help(const char *name)
{
const char *base = strchr(name, '/');
printf(
NAME " 0.2\n"
"Extract embedded art from ID3v2 tags to current directory\n"
"usage: %s filename.mp3\n"
"\nReport bugs to <[email protected]>.\n",
base? base+1 : name
);
exit(1);
}
static void eprintf(const char* msg, ...)
{
va_list args;
va_start(args, msg);
fprintf (stderr, "%s: ", NAME);
vfprintf (stderr, msg, args);
va_end(args);
}
const char* mime_ext(const char *fname, const char* mime_type)
{
static const char* exts[] = {
"image/jpeg", ".jpg",
"image/png", ".png",
0
};
size_t i;
for(i=0; exts[i]; i+=2) {
if(strcmp(mime_type, exts[i]) == 0)
return exts[i+1];
}
eprintf("%s: unknown mime type: %s\n", fname, mime_type);
return ".unknown";
}
void write_blob(const char *basename, const char* ext, const void* blob, size_t size)
{
static char image_fn[512];
FILE *f;
strncpy(image_fn, basename, 510);
strncat(image_fn, ext, 510);
if( access(image_fn, F_OK) == 0 ) {
eprintf("`%s' already exists, not overwriting\n", image_fn);
return;
}
f = fopen(image_fn, "wb");
if(!f || fwrite(blob, 1, size, f) != size | fclose(f) != 0) {
eprintf("`%s' could not be written\n", image_fn);
perror(0);
} else {
printf("%s\n", image_fn);
}
}
const char *membrk0(const char *buf, size_t size, int wide)
{
const char* const end = buf + size - wide;
const int step = 1+wide;
for( ; buf < end; buf += step) {
if(!buf[0] && !buf[wide])
return buf;
}
return 0;
}
int main(int argc, char *argv[])
{
if(argc <= 1 || argc > 2) Help(argv[0]);
if(*++argv) {
void *tag = ID3_readf(*argv, 0);
ID3FRAME f;
int counter = 0;
if(!tag) return 0;
if(ID3_start(f,tag) >= 2) {
while(ID3_frame(f)) {
if(strcmp(f->ID, "APIC") == 0) {
/* see ID3v2.3 4.15 -- 'Attached Picture' for reference */
char wide = f->data[0] == 1 || f->data[0] == 2;
const char *mime_type = f->data+1;
const char *type = memchr(mime_type, 0, f->size-(2+wide));
const char *descr, *blob;
if(!type || (type[1]&0xFFu) > sizeof picture_types/sizeof *picture_types) {
eprintf("%s has an incorrect ID3v2 tag!\n", *argv);
continue;
} else {
++type; /* skip terminator */
}
descr = type+1;
blob = membrk0(descr, f->size-(descr-f->data), wide);
if(!blob) {
eprintf("%s has an incorrect ID3v2 tag!\n", *argv);
continue;
} else {
blob += 1+wide; /* skip terminator */
}
write_blob( picture_types[*type],
mime_ext(*argv, mime_type),
blob,
f->size - (blob - f->data) );
counter++;
}
}
}
if(counter == 0)
eprintf("%s contains no embedded images\n", *argv);
ID3_free(tag);
}
return 0;
}