mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-09-16 17:10:35 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/gst-libs/gst/tag/id3v2frames.c
Jan Schmidt 5b67108b7d tag: id3v2: Rework string parsing to always walk over BOM markers in UTF16 strings, using the endianness indicated by the innermost one ... 
Original commit message from CVS:
* gst/autodetect/gstautoaudiosink.c:
(gst_auto_audio_sink_find_best):
* gst/autodetect/gstautovideosink.c:
(gst_auto_video_sink_find_best):
Make the name of the child element be based on the name of the
parent, so that debug output is more useful.
* gst-libs/gst/tag/id3v2frames.c: (find_utf16_bom),
(parse_insert_string_field), (parse_split_strings):
Rework string parsing to always walk over BOM markers in UTF16
strings, using the endianness indicated by the innermost one,
then trying the opposite endianness if that fails to convert
to valid UTF-8. Fixes #341774
2011-08-15 00:10:28 +01:00

829 lines
23 KiB
C
Raw Blame History

/* -*- Mode: C; tab-width: 2; indent-tabs-mode: t; c-basic-offset: 2 -*- */
/* Copyright 2005 Jan Schmidt <thaytan@mad.scientist.com>
* Copyright 2002,2003 Scott Wheeler <wheeler@kde.org> (portions from taglib)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <stdlib.h>
#include <gst/tag/tag.h>
#ifdef HAVE_ZLIB
#include <zlib.h>
#endif
#include "id3tags.h"
GST_DEBUG_CATEGORY_EXTERN (id3demux_debug);
#define GST_CAT_DEFAULT (id3demux_debug)
static gchar *parse_comment_frame (ID3TagsWorking * work);
static GArray *parse_text_identification_frame (ID3TagsWorking * work);
static gchar *parse_user_text_identification_frame (ID3TagsWorking * work,
const gchar ** tag_name);
static gchar *parse_unique_file_identifier (ID3TagsWorking * work,
const gchar ** tag_name);
static gboolean parse_relative_volume_adjustment_two (ID3TagsWorking * work);
static gboolean id3v2_tag_to_taglist (ID3TagsWorking * work,
const gchar * tag_name, const gchar * tag_str);
/* Parse a single string into an array of gchar* */
static void parse_split_strings (guint8 encoding, gchar * data, gint data_size,
GArray ** out_fields);
static void free_tag_strings (GArray * fields);
static gboolean
id3v2_genre_fields_to_taglist (ID3TagsWorking * work, const gchar * tag_name,
GArray * tag_fields);
#define ID3V2_ENCODING_ISO8859 0x00
#define ID3V2_ENCODING_UTF16 0x01
#define ID3V2_ENCODING_UTF16BE 0x02
#define ID3V2_ENCODING_UTF8 0x03
extern guint read_synch_uint (guint8 * data, guint size);
gboolean
id3demux_id3v2_parse_frame (ID3TagsWorking * work)
{
const gchar *tag_name;
gboolean result = FALSE;
gint i;
guint8 *frame_data = work->hdr.frame_data;
guint frame_data_size = work->cur_frame_size;
gchar *tag_str = NULL;
GArray *tag_fields = NULL;
/* Check that the frame id is valid */
for (i = 0; i < 5 && work->frame_id[i] != '\0'; i++) {
if (!g_ascii_isalnum (work->frame_id[i])) {
GST_DEBUG ("Encountered invalid frame_id");
return FALSE;
}
}
/* Can't handle encrypted frames right now */
if (work->frame_flags & ID3V2_FRAME_FORMAT_ENCRYPTION) {
GST_WARNING ("Encrypted frames are not supported");
return FALSE;
}
if (work->frame_flags & ID3V2_FRAME_FORMAT_UNSYNCHRONISATION) {
GST_WARNING ("ID3v2 frame with unsupported unsynchronisation applied. "
"May fail badly");
}
tag_name = gst_tag_from_id3_tag (work->frame_id);
if (tag_name == NULL &&
strncmp (work->frame_id, "RVA2", 4) != 0 &&
strncmp (work->frame_id, "TXXX", 4) != 0 &&
strncmp (work->frame_id, "UFID", 4) != 0) {
return FALSE;
}
if (work->frame_flags & (ID3V2_FRAME_FORMAT_COMPRESSION |
ID3V2_FRAME_FORMAT_DATA_LENGTH_INDICATOR)) {
if (work->hdr.frame_data_size <= 4)
return FALSE;
work->parse_size = read_synch_uint (frame_data, 4);
frame_data += 4;
frame_data_size -= 4;
if (work->parse_size < frame_data_size) {
GST_WARNING ("ID3v2 frame %s has invalid size %d.", tag_name,
frame_data_size);
return FALSE;
}
}
work->parse_size = frame_data_size;
if (work->frame_flags & ID3V2_FRAME_FORMAT_COMPRESSION) {
#ifdef HAVE_ZLIB
uLongf destSize = work->parse_size;
Bytef *dest, *src;
work->parse_data = g_malloc (work->parse_size);
g_return_val_if_fail (work->parse_data != NULL, FALSE);
dest = (Bytef *) work->parse_data;
src = (Bytef *) frame_data;
if (uncompress (dest, &destSize, src, frame_data_size) != Z_OK) {
g_free (work->parse_data);
return FALSE;
}
if (destSize != work->parse_size) {
GST_WARNING
("Decompressing ID3v2 frame %s did not produce expected size %d bytes (got %d)",
tag_name, work->parse_data, destSize);
return FALSE;
}
#else
GST_WARNING ("Compressed ID3v2 tag frame could not be decompressed"
" because gstid3demux was compiled without zlib support");
return FALSE;
#endif
} else {
work->parse_data = frame_data;
}
if (work->frame_id[0] == 'T') {
if (strcmp (work->frame_id, "TXXX") != 0) {
/* Text identification frame */
tag_fields = parse_text_identification_frame (work);
} else {
/* Handle user text frame */
tag_str = parse_user_text_identification_frame (work, &tag_name);
}
} else if (!strcmp (work->frame_id, "COMM")) {
/* Comment */
tag_str = parse_comment_frame (work);
} else if (!strcmp (work->frame_id, "APIC")) {
/* Attached picture */
} else if (!strcmp (work->frame_id, "RVA2")) {
/* Relative volume */
result = parse_relative_volume_adjustment_two (work);
} else if (!strcmp (work->frame_id, "UFID")) {
/* Unique file identifier */
tag_str = parse_unique_file_identifier (work, &tag_name);
}
if (work->frame_flags & ID3V2_FRAME_FORMAT_COMPRESSION)
g_free (work->parse_data);
if (tag_str != NULL) {
/* g_print ("Tag %s value %s\n", tag_name, tag_str); */
result = id3v2_tag_to_taglist (work, tag_name, tag_str);
g_free (tag_str);
}
if (tag_fields != NULL) {
if (strcmp (work->frame_id, "TCON") == 0) {
/* Genre strings need special treatment */
result |= id3v2_genre_fields_to_taglist (work, tag_name, tag_fields);
} else {
gint t;
for (t = 0; t < tag_fields->len; t++) {
tag_str = g_array_index (tag_fields, gchar *, t);
if (tag_str != NULL && tag_str[0] != '\0')
result |= id3v2_tag_to_taglist (work, tag_name, tag_str);
}
}
free_tag_strings (tag_fields);
}
return result;
}
static gchar *
parse_comment_frame (ID3TagsWorking * work)
{
guint8 encoding;
gchar language[4];
GArray *fields = NULL;
gchar *out_str = NULL;
gchar *description, *text;
if (work->parse_size < 6)
return NULL;
encoding = work->parse_data[0];
language[0] = work->parse_data[1];
language[1] = work->parse_data[2];
language[2] = work->parse_data[3];
language[3] = 0;
parse_split_strings (encoding, (gchar *) work->parse_data + 4,
work->parse_size - 4, &fields);
if (fields == NULL || fields->len < 2) {
GST_WARNING ("Failed to decode comment frame");
goto fail;
}
description = g_array_index (fields, gchar *, 0);
text = g_array_index (fields, gchar *, 1);
if (!g_utf8_validate (text, -1, NULL)) {
GST_WARNING ("Converted string is not valid utf-8");
goto fail;
} else {
if (strlen (description) > 0 && g_utf8_validate (description, -1, NULL)) {
out_str = g_strdup_printf ("Description: %s\nComment: %s",
description, text);
} else {
out_str = g_strdup (text);
}
}
fail:
free_tag_strings (fields);
return out_str;
}
static GArray *
parse_text_identification_frame (ID3TagsWorking * work)
{
guchar encoding;
GArray *fields = NULL;
if (work->parse_size < 2)
return NULL;
encoding = work->parse_data[0];
parse_split_strings (encoding, (gchar *) work->parse_data + 1,
work->parse_size - 1, &fields);
if (fields) {
if (fields->len > 0) {
GST_LOG ("Read %d fields from Text ID frame of size %d. First is '%s'",
fields->len, work->parse_size - 1,
g_array_index (fields, gchar *, 0));
} else {
GST_LOG ("Read %d fields from Text ID frame of size %d", fields->len,
work->parse_size - 1);
}
}
return fields;
}
static gchar *
parse_user_text_identification_frame (ID3TagsWorking * work,
const gchar ** tag_name)
{
gchar *ret;
guchar encoding;
GArray *fields = NULL;
*tag_name = NULL;
if (work->parse_size < 2)
return NULL;
encoding = work->parse_data[0];
parse_split_strings (encoding, (gchar *) work->parse_data + 1,
work->parse_size - 1, &fields);
if (fields == NULL)
return NULL;
if (fields->len != 2) {
GST_WARNING ("Expected 2 fields in TXXX frame, but got %d", fields->len);
free_tag_strings (fields);
return NULL;
}
*tag_name =
gst_tag_from_id3_user_tag ("TXXX", g_array_index (fields, gchar *, 0));
GST_LOG ("TXXX frame of size %d. Mapped descriptor '%s' to GStreamer tag %s",
work->parse_size - 1, g_array_index (fields, gchar *, 0),
GST_STR_NULL (*tag_name));
if (*tag_name) {
ret = g_strdup (g_array_index (fields, gchar *, 1));
/* GST_LOG ("%s = %s", *tag_name, GST_STR_NULL (ret)); */
} else {
ret = NULL;
}
free_tag_strings (fields);
return ret;
}
static gboolean
parse_id_string (ID3TagsWorking * work, gchar ** p_str, gint * p_len,
gint * p_datalen)
{
gint len, datalen;
if (work->parse_size < 2)
return FALSE;
for (len = 0; len < work->parse_size - 1; ++len) {
if (work->parse_data[len] == '\0')
break;
}
datalen = work->parse_size - (len + 1);
if (len == 0 || datalen <= 0)
return FALSE;
*p_str = g_strndup ((gchar *) work->parse_data, len);
*p_len = len;
*p_datalen = datalen;
return TRUE;
}
static gchar *
parse_unique_file_identifier (ID3TagsWorking * work, const gchar ** tag_name)
{
gint len, datalen;
gchar *owner_id, *data, *ret = NULL;
GST_LOG ("parsing UFID frame of size %d", work->parse_size);
if (!parse_id_string (work, &owner_id, &len, &datalen))
return NULL;
data = (gchar *) work->parse_data + len + 1;
GST_LOG ("UFID owner ID: %s (+ %d bytes of data)", owner_id, datalen);
if (strcmp (owner_id, "http://musicbrainz.org") == 0 &&
g_utf8_validate (data, datalen, NULL)) {
*tag_name = GST_TAG_MUSICBRAINZ_TRACKID;
ret = g_strndup (data, datalen);
} else {
GST_INFO ("Unknown UFID owner ID: %s", owner_id);
}
g_free (owner_id);
return ret;
}
#define ID3V2_RVA2_CHANNEL_MASTER 1
static gboolean
parse_relative_volume_adjustment_two (ID3TagsWorking * work)
{
const gchar *gain_tag_name = NULL;
const gchar *peak_tag_name = NULL;
gdouble gain_dB, peak_val;
guint64 peak;
guint8 *data, chan, peak_bits;
gchar *id;
gint len, datalen, i;
if (!parse_id_string (work, &id, &len, &datalen))
return FALSE;
if (datalen < (1 + 2 + 1)) {
GST_WARNING ("broken RVA2 frame, data size only %d bytes", datalen);
g_free (id);
return FALSE;
}
data = work->parse_data + len + 1;
chan = GST_READ_UINT8 (data);
gain_dB = (gdouble) ((gint16) GST_READ_UINT16_BE (data + 1)) / 512.0;
/* The meaning of the peak value is not defined in the ID3v2 spec. However,
* the first/only implementation of this seems to have been in XMMS, and
* other libs (like mutagen) seem to follow that implementation as well:
* see http://bugs.xmms.org/attachment.cgi?id=113&action=view */
peak_bits = GST_READ_UINT8 (data + 1 + 2);
if (peak_bits > 64) {
GST_WARNING ("silly peak precision of %d bits, ignoring", (gint) peak_bits);
peak_bits = 0;
}
data += 1 + 2 + 1;
datalen -= 1 + 2 + 1;
if (peak_bits == 16) {
peak = GST_READ_UINT16_BE (data);
} else {
peak = 0;
for (i = 0; i < (GST_ROUND_UP_8 (peak_bits) / 8) && datalen > 0; ++i) {
peak = peak << 8;
peak |= GST_READ_UINT8 (data);
++data;
--datalen;
}
}
peak = peak << (64 - GST_ROUND_UP_8 (peak_bits));
peak_val =
gst_guint64_to_gdouble (peak) / gst_util_guint64_to_gdouble (G_MAXINT64);
GST_LOG ("RVA2 frame: id=%s, chan=%u, adj=%.2fdB, peak_bits=%u, peak=%.2f",
id, chan, gain_dB, (guint) peak_bits, peak_val);
if (chan == ID3V2_RVA2_CHANNEL_MASTER && strcmp (id, "track") == 0) {
gain_tag_name = GST_TAG_TRACK_GAIN;
peak_tag_name = GST_TAG_TRACK_PEAK;
} else if (chan == ID3V2_RVA2_CHANNEL_MASTER && strcmp (id, "album") == 0) {
gain_tag_name = GST_TAG_ALBUM_GAIN;
peak_tag_name = GST_TAG_ALBUM_PEAK;
} else {
GST_INFO ("Unhandled RVA2 frame id '%s' for channel %d", id, chan);
}
if (gain_tag_name) {
gst_tag_list_add (work->tags, GST_TAG_MERGE_APPEND,
gain_tag_name, gain_dB, NULL);
}
if (peak_tag_name && peak_bits > 0) {
gst_tag_list_add (work->tags, GST_TAG_MERGE_APPEND,
peak_tag_name, peak_val, NULL);
}
g_free (id);
return (gain_tag_name != NULL || peak_tag_name != NULL);
}
static gboolean
id3v2_tag_to_taglist (ID3TagsWorking * work, const gchar * tag_name,
const gchar * tag_str)
{
GType tag_type = gst_tag_get_type (tag_name);
GstTagList *tag_list = work->tags;
if (tag_str == NULL)
return FALSE;
switch (tag_type) {
case G_TYPE_UINT:
{
guint tmp;
gchar *check;
tmp = strtoul ((char *) tag_str, &check, 10);
if (strcmp (tag_name, GST_TAG_TRACK_NUMBER) == 0) {
if (*check == '/') {
guint total;
check++;
total = strtoul (check, &check, 10);
if (*check != '\0')
break;
gst_tag_list_add (tag_list, GST_TAG_MERGE_APPEND,
GST_TAG_TRACK_COUNT, total, NULL);
}
} else if (strcmp (tag_name, GST_TAG_ALBUM_VOLUME_NUMBER) == 0) {
if (*check == '/') {
guint total;
check++;
total = strtoul (check, &check, 10);
if (*check != '\0')
break;
gst_tag_list_add (tag_list, GST_TAG_MERGE_APPEND,
GST_TAG_ALBUM_VOLUME_COUNT, total, NULL);
}
}
if (*check != '\0')
break;
gst_tag_list_add (tag_list, GST_TAG_MERGE_APPEND, tag_name, tmp, NULL);
break;
}
case G_TYPE_UINT64:
{
guint64 tmp;
g_assert (strcmp (tag_name, GST_TAG_DURATION) == 0);
tmp = strtoul (tag_str, NULL, 10);
if (tmp == 0) {
break;
}
gst_tag_list_add (tag_list, GST_TAG_MERGE_APPEND,
GST_TAG_DURATION, tmp * 1000 * 1000, NULL);
break;
}
case G_TYPE_STRING:{
if (!strcmp (tag_name, GST_TAG_GENRE)) {
if (work->prev_genre && !strcmp (tag_str, work->prev_genre))
break; /* Same as the last genre */
g_free (work->prev_genre);
work->prev_genre = g_strdup (tag_str);
}
gst_tag_list_add (tag_list, GST_TAG_MERGE_APPEND,
tag_name, tag_str, NULL);
break;
}
default:{
gchar *tmp = NULL;
GValue src = { 0, };
GValue dest = { 0, };
/* Ensure that any date string is complete */
if (tag_type == GST_TYPE_DATE) {
guint year = 1901, month = 1, day = 1;
/* Dates can be yyyy-MM-dd, yyyy-MM or yyyy, but we need
* the first type */
if (sscanf (tag_str, "%04u-%02u-%02u", &year, &month, &day) == 0)
break;
tmp = g_strdup_printf ("%04u-%02u-%02u", year, month, day);
tag_str = tmp;
}
/* handles anything else */
g_value_init (&src, G_TYPE_STRING);
g_value_set_string (&src, (const gchar *) tag_str);
g_value_init (&dest, tag_type);
if (g_value_transform (&src, &dest)) {
gst_tag_list_add_values (tag_list, GST_TAG_MERGE_APPEND,
tag_name, &dest, NULL);
} else if (tag_type == G_TYPE_DOUBLE) {
/* replaygain tags in TXXX frames ... */
g_value_set_double (&dest, g_strtod (tag_str, NULL));
gst_tag_list_add_values (tag_list, GST_TAG_MERGE_KEEP,
tag_name, &dest, NULL);
GST_LOG ("Converted string '%s' to double %f", tag_str,
g_value_get_double (&dest));
} else {
GST_WARNING ("Failed to transform tag from string to type '%s'",
g_type_name (tag_type));
}
g_value_unset (&src);
g_value_unset (&dest);
g_free (tmp);
break;
}
}
return TRUE;
}
/* Check that an array of characters contains only digits */
static gboolean
id3v2_are_digits (const gchar * chars, gint size)
{
gint i;
for (i = 0; i < size; i++) {
if (!g_ascii_isdigit (chars[i]))
return FALSE;
}
return TRUE;
}
static gboolean
id3v2_genre_string_to_taglist (ID3TagsWorking * work, const gchar * tag_name,
const gchar * tag_str, gint len)
{
g_return_val_if_fail (tag_str != NULL, FALSE);
/* If it's a number, it might be a defined genre */
if (id3v2_are_digits (tag_str, len)) {
tag_str = gst_tag_id3_genre_get (strtol (tag_str, NULL, 10));
return id3v2_tag_to_taglist (work, tag_name, tag_str);
}
/* Otherwise it might be "RX" or "CR" */
if (len == 2) {
if (g_ascii_strncasecmp ("rx", tag_str, len) == 0)
return id3v2_tag_to_taglist (work, tag_name, "Remix");
if (g_ascii_strncasecmp ("cr", tag_str, len) == 0)
return id3v2_tag_to_taglist (work, tag_name, "Cover");
}
/* Otherwise it's a string */
return id3v2_tag_to_taglist (work, tag_name, tag_str);
}
static gboolean
id3v2_genre_fields_to_taglist (ID3TagsWorking * work, const gchar * tag_name,
GArray * tag_fields)
{
gchar *tag_str = NULL;
gboolean result = FALSE;
gint i;
for (i = 0; i < tag_fields->len; i++) {
gint len;
tag_str = g_array_index (tag_fields, gchar *, 0);
if (tag_str == NULL)
continue;
len = strlen (tag_str);
/* Only supposed to see '(n)' type numeric genre strings in ID3 <= 2.3.0
* but apparently we see them in 2.4.0 sometimes too */
if (TRUE || work->hdr.version <= 0x300) { /* <= 2.3.0 */
/* Check for genre numbers wrapped in parentheses, possibly
* followed by a string */
while (len >= 2) {
gint pos;
gboolean found = FALSE;
/* Double parenthesis ends the numeric genres, but we need
* to swallow the first one so we actually output '(' */
if (tag_str[0] == '(' && tag_str[1] == '(') {
tag_str++;
len--;
break;
}
/* If the first char is not a parenthesis, then stop
* looking for parenthesised genre strings */
if (tag_str[0] != '(')
break;
for (pos = 1; pos < len; pos++) {
if (tag_str[pos] == ')') {
gchar *tmp_str;
tmp_str = g_strndup (tag_str + 1, pos - 1);
result |=
id3v2_genre_string_to_taglist (work, tag_name, tmp_str,
pos - 1);
g_free (tmp_str);
tag_str += pos + 1;
len -= pos + 1;
found = TRUE;
break;
}
/* If we encounter a non-digit while searching for a closing
* parenthesis, we should not try and interpret this as a
* numeric genre string */
if (!g_ascii_isdigit (tag_str[pos]))
break;
}
if (!found)
break; /* There was no closing parenthesis */
}
}
if (len > 0 && tag_str != NULL)
result |= id3v2_genre_string_to_taglist (work, tag_name, tag_str, len);
}
return result;
}
static const gchar utf16enc[] = "UTF-16";
static const gchar utf16leenc[] = "UTF-16LE";
static const gchar utf16beenc[] = "UTF-16BE";
static gboolean
find_utf16_bom (gchar * data, const gchar ** p_in_encoding)
{
guint16 marker = (GST_READ_UINT8 (data) << 8) | GST_READ_UINT8 (data + 1);
switch (marker) {
case 0xFFFE:
*p_in_encoding = utf16leenc;
return TRUE;
case 0xFEFF:
*p_in_encoding = utf16beenc;
return TRUE;
default:
break;
}
return FALSE;
}
static void
parse_insert_string_field (guint8 encoding, gchar * data, gint data_size,
GArray * fields)
{
gchar *field = NULL;
switch (encoding) {
case ID3V2_ENCODING_UTF16:
case ID3V2_ENCODING_UTF16BE:
{
const gchar *in_encode;
if (encoding == ID3V2_ENCODING_UTF16)
in_encode = utf16enc;
else
in_encode = utf16beenc;
/* Sometimes we see strings with multiple BOM markers at the start.
* In that case, we assume the innermost one is correct. If that fails
* to produce valid UTF-8, we try the other endianness anyway */
while (data_size > 2 && find_utf16_bom (data, &in_encode)) {
data += 2; /* skip BOM */
data_size -= 2;
}
field = g_convert (data, data_size, "UTF-8", in_encode, NULL, NULL, NULL);
if (field == NULL || g_utf8_validate (field, -1, NULL) == FALSE) {
/* As a fallback, try interpreting UTF-16 in the other endianness */
if (in_encode == utf16beenc)
field = g_convert (data, data_size, "UTF-8", utf16leenc,
NULL, NULL, NULL);
}
}
break;
case ID3V2_ENCODING_ISO8859:
field = g_convert (data, data_size, "UTF-8", "ISO-8859-1",
NULL, NULL, NULL);
break;
default:
field = g_strndup (data, data_size);
break;
}
if (field) {
if (g_utf8_validate (field, -1, NULL)) {
g_array_append_val (fields, field);
return;
}
GST_DEBUG ("%s was bad UTF-8 after conversion from encoding %d. Ignoring",
field, encoding);
g_free (field);
}
}
static void
parse_split_strings (guint8 encoding, gchar * data, gint data_size,
GArray ** out_fields)
{
GArray *fields = g_array_new (FALSE, TRUE, sizeof (gchar *));
gint text_pos;
gint prev = 0;
g_return_if_fail (out_fields != NULL);
switch (encoding) {
case ID3V2_ENCODING_ISO8859:
for (text_pos = 0; text_pos < data_size; text_pos++) {
if (data[text_pos] == 0) {
parse_insert_string_field (encoding, data + prev,
text_pos - prev + 1, fields);
prev = text_pos + 1;
}
}
if (data_size - prev > 0 && data[prev] != 0x00) {
parse_insert_string_field (encoding, data + prev,
data_size - prev, fields);
}
break;
case ID3V2_ENCODING_UTF8:
for (prev = 0, text_pos = 0; text_pos < data_size; text_pos++) {
if (data[text_pos] == '\0') {
parse_insert_string_field (encoding, data + prev,
text_pos - prev + 1, fields);
prev = text_pos + 1;
}
}
if (data_size - prev > 0 && data[prev] != 0x00) {
parse_insert_string_field (encoding, data + prev,
data_size - prev, fields);
}
break;
case ID3V2_ENCODING_UTF16:
case ID3V2_ENCODING_UTF16BE:
{
/* Find '\0\0' terminator */
for (text_pos = 0; text_pos < data_size - 1; text_pos += 2) {
if (data[text_pos] == '\0' && data[text_pos + 1] == '\0') {
/* found a delimiter */
parse_insert_string_field (encoding, data + prev,
text_pos - prev + 2, fields);
text_pos++; /* Advance to the 2nd NULL terminator */
prev = text_pos + 1;
break;
}
}
if (data_size - prev > 1 &&
(data[prev] != 0x00 || data[prev + 1] != 0x00)) {
/* There were 2 or more non-null chars left, convert those too */
parse_insert_string_field (encoding, data + prev,
data_size - prev, fields);
}
break;
}
}
if (fields->len > 0)
*out_fields = fields;
else
g_array_free (fields, TRUE);
}
static void
free_tag_strings (GArray * fields)
{
if (fields) {
gint i;
gchar *c;
for (i = 0; i < fields->len; i++) {
c = g_array_index (fields, gchar *, i);
g_free (c);
}
g_array_free (fields, TRUE);
}
}
Reference in a new issue View git blame Copy permalink