initial import

2 files changed, 202 insertions, 0 deletions

diff --git a/src/flac/vorbiscomment.c b/src/flac/vorbiscomment.c
new file mode 100644
index 00000000..2f836c43
--- /dev/null
+++ b/src/flac/vorbiscomment.c
@@ -0,0 +1,176 @@
+/* flac - Command-line FLAC encoder/decoder
+ * Copyright (C) 2002  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 "FLAC/assert.h"
+#include "FLAC/metadata.h"
+#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/main.c.  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;
+} 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__bool needs_free = false;
+
+	FLAC__ASSERT(0 != block);
+	FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
+	FLAC__ASSERT(0 != field);
+	FLAC__ASSERT(0 != needs_write);
+
+	if(raw) {
+		entry.entry = field->field;
+	}
+	else if(utf8_encode(field->field, &converted) >= 0) {
+		entry.entry = converted;
+		needs_free = true;
+	}
+	else {
+		*violation = "couldn't convert comment to UTF-8";
+		return false;
+	}
+
+	entry.length = strlen(entry.entry);
+
+	if(!FLAC__metadata_object_vorbiscomment_insert_comment(block, block->data.vorbis_comment.num_comments, entry, /*copy=*/true)) {
+		if(needs_free)
+			free(converted);
+		*violation = "memory allocation failure";
+		return false;
+	}
+	else {
+		*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, 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));
+
+	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=*/false, violation)) {
+		free_field(&parsed);
+		return false;
+	}
+	else {
+		free_field(&parsed);
+		return true;
+	}
+}
diff --git a/src/flac/vorbiscomment.h b/src/flac/vorbiscomment.h
new file mode 100644
index 00000000..7721bebc
--- /dev/null
+++ b/src/flac/vorbiscomment.h
@@ -0,0 +1,26 @@
+/* flac - Command-line FLAC encoder/decoder
+ * Copyright (C) 2002  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.
+ */
+
+#ifndef flac__vorbiscomment_h
+#define flac__vorbiscomment_h
+
+#include "FLAC/metadata.h"
+
+FLAC__bool flac__vorbiscomment_add(FLAC__StreamMetadata *block, const char *comment, const char **violation);
+
+#endif