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Diffstat (limited to '3rdparty/libflac/src/flac/vorbiscomment.c')
-rw-r--r--3rdparty/libflac/src/flac/vorbiscomment.c248
1 files changed, 248 insertions, 0 deletions
diff --git a/3rdparty/libflac/src/flac/vorbiscomment.c b/3rdparty/libflac/src/flac/vorbiscomment.c
new file mode 100644
index 00000000000..6b35a1e6359
--- /dev/null
+++ b/3rdparty/libflac/src/flac/vorbiscomment.c
@@ -0,0 +1,248 @@
+/* flac - Command-line FLAC encoder/decoder
+ * Copyright (C) 2002,2003,2004,2005,2006,2007 Josh Coalson
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "vorbiscomment.h"
+#include "FLAC/assert.h"
+#include "FLAC/metadata.h"
+#include "share/grabbag.h" /* for grabbag__file_get_filesize() */
+#include "share/utf8.h"
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+/*
+ * This struct and the following 4 static functions are copied from
+ * ../metaflac/. Maybe someday there will be a convenience
+ * library for Vorbis comment parsing.
+ */
+typedef struct {
+ char *field; /* the whole field as passed on the command line, i.e. "NAME=VALUE" */
+ char *field_name;
+ /* according to the vorbis spec, field values can contain \0 so simple C strings are not enough here */
+ unsigned field_value_length;
+ char *field_value;
+ FLAC__bool field_value_from_file; /* true if field_value holds a filename for the value, false for plain value */
+} Argument_VcField;
+
+static void die(const char *message)
+{
+ FLAC__ASSERT(0 != message);
+ fprintf(stderr, "ERROR: %s\n", message);
+ exit(1);
+}
+
+static char *local_strdup(const char *source)
+{
+ char *ret;
+ FLAC__ASSERT(0 != source);
+ if(0 == (ret = strdup(source)))
+ die("out of memory during strdup()");
+ return ret;
+}
+
+static FLAC__bool parse_vorbis_comment_field(const char *field_ref, char **field, char **name, char **value, unsigned *length, const char **violation)
+{
+ static const char * const violations[] = {
+ "field name contains invalid character",
+ "field contains no '=' character"
+ };
+
+ char *p, *q, *s;
+
+ if(0 != field)
+ *field = local_strdup(field_ref);
+
+ s = local_strdup(field_ref);
+
+ if(0 == (p = strchr(s, '='))) {
+ free(s);
+ *violation = violations[1];
+ return false;
+ }
+ *p++ = '\0';
+
+ for(q = s; *q; q++) {
+ if(*q < 0x20 || *q > 0x7d || *q == 0x3d) {
+ free(s);
+ *violation = violations[0];
+ return false;
+ }
+ }
+
+ *name = local_strdup(s);
+ *value = local_strdup(p);
+ *length = strlen(p);
+
+ free(s);
+ return true;
+}
+
+/* slight modification: no 'filename' arg, and errors are passed back in 'violation' instead of printed to stderr */
+static FLAC__bool set_vc_field(FLAC__StreamMetadata *block, const Argument_VcField *field, FLAC__bool *needs_write, FLAC__bool raw, const char **violation)
+{
+ FLAC__StreamMetadata_VorbisComment_Entry entry;
+ char *converted;
+
+ FLAC__ASSERT(0 != block);
+ FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
+ FLAC__ASSERT(0 != field);
+ FLAC__ASSERT(0 != needs_write);
+
+ if(field->field_value_from_file) {
+ /* read the file into 'data' */
+ FILE *f = 0;
+ char *data = 0;
+ const off_t size = grabbag__file_get_filesize(field->field_value);
+ if(size < 0) {
+ *violation = "can't open file for tag value";
+ return false;
+ }
+ if(size >= 0x100000) { /* magic arbitrary limit, actual format limit is near 16MB */
+ *violation = "file for tag value is too large";
+ return false;
+ }
+ if(0 == (data = malloc(size+1)))
+ die("out of memory allocating tag value");
+ data[size] = '\0';
+ if(0 == (f = fopen(field->field_value, "rb")) || fread(data, 1, size, f) != (size_t)size) {
+ free(data);
+ if(f)
+ fclose(f);
+ *violation = "error while reading file for tag value";
+ return false;
+ }
+ fclose(f);
+ if(strlen(data) != (size_t)size) {
+ free(data);
+ *violation = "file for tag value has embedded NULs";
+ return false;
+ }
+
+ /* move 'data' into 'converted', converting to UTF-8 if necessary */
+ if(raw) {
+ converted = data;
+ }
+ else if(utf8_encode(data, &converted) >= 0) {
+ free(data);
+ }
+ else {
+ free(data);
+ *violation = "error converting file contents to UTF-8 for tag value";
+ return false;
+ }
+
+ /* create and entry and append it */
+ if(!FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&entry, field->field_name, converted)) {
+ free(converted);
+ *violation = "file for tag value is not valid UTF-8";
+ return false;
+ }
+ free(converted);
+ if(!FLAC__metadata_object_vorbiscomment_append_comment(block, entry, /*copy=*/false)) {
+ *violation = "memory allocation failure";
+ return false;
+ }
+
+ *needs_write = true;
+ return true;
+ }
+ else {
+ FLAC__bool needs_free = false;
+ if(raw) {
+ entry.entry = (FLAC__byte *)field->field;
+ }
+ else if(utf8_encode(field->field, &converted) >= 0) {
+ entry.entry = (FLAC__byte *)converted;
+ needs_free = true;
+ }
+ else {
+ *violation = "error converting comment to UTF-8";
+ return false;
+ }
+ entry.length = strlen((const char *)entry.entry);
+ if(!FLAC__format_vorbiscomment_entry_is_legal(entry.entry, entry.length)) {
+ if(needs_free)
+ free(converted);
+ /*
+ * our previous parsing has already established that the field
+ * name is OK, so it must be the field value
+ */
+ *violation = "tag value for is not valid UTF-8";
+ return false;
+ }
+
+ if(!FLAC__metadata_object_vorbiscomment_append_comment(block, entry, /*copy=*/true)) {
+ if(needs_free)
+ free(converted);
+ *violation = "memory allocation failure";
+ return false;
+ }
+
+ *needs_write = true;
+ if(needs_free)
+ free(converted);
+ return true;
+ }
+}
+
+/*
+ * The rest of the code is novel
+ */
+
+static void free_field(Argument_VcField *obj)
+{
+ if(0 != obj->field)
+ free(obj->field);
+ if(0 != obj->field_name)
+ free(obj->field_name);
+ if(0 != obj->field_value)
+ free(obj->field_value);
+}
+
+FLAC__bool flac__vorbiscomment_add(FLAC__StreamMetadata *block, const char *comment, FLAC__bool value_from_file, FLAC__bool raw, const char **violation)
+{
+ Argument_VcField parsed;
+ FLAC__bool dummy;
+
+ FLAC__ASSERT(0 != block);
+ FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
+ FLAC__ASSERT(0 != comment);
+
+ memset(&parsed, 0, sizeof(parsed));
+
+ parsed.field_value_from_file = value_from_file;
+ if(!parse_vorbis_comment_field(comment, &(parsed.field), &(parsed.field_name), &(parsed.field_value), &(parsed.field_value_length), violation)) {
+ free_field(&parsed);
+ return false;
+ }
+
+ if(!set_vc_field(block, &parsed, &dummy, raw, violation)) {
+ free_field(&parsed);
+ return false;
+ }
+ else {
+ free_field(&parsed);
+ return true;
+ }
+}