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/* Creative Commons has made the contents of this file
* available under a CC-GNU-LGPL license:
*
* http://creativecommons.org/licenses/LGPL/2.1/
*
* A copy of the full license can be found as part of this
* distribution in the file COPYING.
*
* You may use the liblicense software in accordance with the
* terms of that license. You agree that you are solely
* responsible for your use of the liblicense software and you
* represent and warrant to Creative Commons that your use
* of the liblicense software will comply with the CC-GNU-LGPL.
*
* Copyright 2007, Creative Commons, www.creativecommons.org.
* Copyright 2007, Jason Kivlighn.
* Copyright (C) 2007 Peter Miller
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#if HAVE_STAT && HAVE_CHMOD
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#endif
#include <liblicense.h>
#include <vorbis/codec.h>
#include <vorbis/vorbisfile.h>
#include "vcedit.h"
static int vorbis_verify_predicate(const char * predicate) {
if (strcmp(predicate, LL_LICENSE) == 0) {
return 1;
} else {
return 0;
}
}
void vorbis_init()
{
}
char* vorbis_read( const char* filename, const ll_uri_t predicate )
{
OggVorbis_File vf;
FILE *fh;
char *license;
char **comments;
if (! vorbis_verify_predicate(predicate)) {
return NULL;
}
fh = fopen(filename,"r");
if (fh) {
if (ov_open(fh, &vf, NULL, 0) < 0) {
fprintf(stderr,"Input does not appear to be an Ogg bitstream.\n");
return NULL;
}
} else {
fprintf(stderr,"Unable to open file for reading.\n");
return NULL;
}
license = NULL;
comments = ov_comment(&vf,-1)->user_comments;
for (; *comments; ++comments ) {
if (strncmp(*comments,"LICENSE=",8) == 0) {
license = strdup(&(*comments)[8]);
break;
}
}
ov_clear(&vf);
return license;
}
int vorbis_write( const char* filename, const char *predicate, const char* uri )
{
int ret = 0;
FILE *fh_in;
if (! vorbis_verify_predicate(predicate)) {
return -LL_E_MODULE_WRITE_FAIL;
}
fh_in = fopen(filename,"rb");
if (fh_in) {
vcedit_state *state = vcedit_new_state();
if (vcedit_open(state, fh_in) < 0) {
fprintf(stderr,"Input does not appear to be an Ogg bitstream.\n");
} else {
char *outfilename;
FILE *fh_out;
outfilename = malloc(strlen(filename)+8);
strcpy(outfilename, filename);
strcat(outfilename, ".vctemp");
fh_out = fopen(outfilename,"wb");
if (fh_out) {
vorbis_comment *vc;
char **comments;
int output_written;
vorbis_comment vc_new;
vorbis_comment_init(&vc_new);
vc = vcedit_comments(state);
comments = vc->user_comments;
for (; *comments; ++comments ) {
if (strncmp(*comments,"LICENSE=",8) != 0) {
vorbis_comment_add(&vc_new,*comments);
}
}
if (uri) {
/*
* The vorbis prototypes need
* const correctness work.
*/
vorbis_comment_add_tag(&vc_new, "LICENSE", (char *)uri);
}
vorbis_comment_clear(vc);
vorbis_comment_init(vc);
comments = vc_new.user_comments;
for (; *comments; ++comments ) {
vorbis_comment_add(vc,*comments);
}
output_written = !vcedit_write(state, fh_out);
fclose(fh_out);
#if HAVE_STAT && HAVE_CHMOD
struct stat st;
stat (filename, &st);
#endif
if(output_written) {
/* Some platforms fail to rename a file if the new name already
* exists, so we need to remove, then rename. How stupid.
*/
if(rename(outfilename, filename)) {
if(remove(filename))
fprintf(stderr, "Error removing old file %s\n", filename);
else if(rename(outfilename, filename))
fprintf(stderr, "Error renaming %s to %s\n", outfilename,
filename);
else {
ret = 1;
}
} else {
ret = 1;
#if HAVE_STAT && HAVE_CHMOD
chmod (filename, st.st_mode);
#endif
}
}
else {
if(remove(outfilename)) {
fprintf(stderr, "Error removing erroneous temporary file %s\n",
outfilename);
}
}
} else {
fprintf(stderr,"Unable to open file for writing.\n");
}
free(outfilename);
}
vcedit_clear(state);
fclose(fh_in);
} else {
fprintf(stderr,"Unable to open file for reading.\n");
}
return ret;
}
const char * vorbis_supported_predicates[] = {LL_LICENSE, NULL};
const char * vorbis_mime_types[] = {"audio/x-vorbis+ogg",
"audio/x-vorbis",
"application/ogg",
NULL};
LL_MODULE_DEFINE("vorbis.so",
"Write licenses in Vorbiscomments within an OGG stream.",
"0.1",
LL_FEATURES_EMBED,
vorbis_supported_predicates,
vorbis_mime_types,
vorbis_init,
vorbis_read,
vorbis_write,
NULL /* no shutdown */);
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