Adding upstream version 1.4.3+ds.upstream/1.4.3+dsupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

8 files changed, 2340 insertions, 0 deletions

diff --git a/src/share/grabbag/CMakeLists.txt b/src/share/grabbag/CMakeLists.txt
new file mode 100644
index 0000000..203ae3f
--- /dev/null
+++ b/src/share/grabbag/CMakeLists.txt
@@ -0,0 +1,14 @@
+add_library(grabbag STATIC
+    alloc.c
+    cuesheet.c
+    file.c
+    picture.c
+    replaygain.c
+    seektable.c
+    snprintf.c)
+target_link_libraries(grabbag PUBLIC
+    FLAC
+    replaygain_analysis)
+if(TARGET win_utf8_io)
+    target_link_libraries(grabbag PUBLIC win_utf8_io)
+endif()
diff --git a/src/share/grabbag/alloc.c b/src/share/grabbag/alloc.c
new file mode 100644
index 0000000..4e5fb60
--- /dev/null
+++ b/src/share/grabbag/alloc.c
@@ -0,0 +1,48 @@
+/* alloc - Convenience routines for safely allocating memory
+ * Copyright (C) 2007-2009  Josh Coalson
+ * Copyright (C) 2011-2023  Xiph.Org Foundation
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of the Xiph.org Foundation nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdlib.h>
+
+#include "share/alloc.h"
+
+void *safe_malloc_mul_2op_(size_t size1, size_t size2)
+{
+	if(!size1 || !size2)
+		return malloc(1); /* malloc(0) is undefined; FLAC src convention is to always allocate */
+	if(size1 > SIZE_MAX / size2)
+		return 0;
+	return malloc(size1*size2);
+}
diff --git a/src/share/grabbag/cuesheet.c b/src/share/grabbag/cuesheet.c
new file mode 100644
index 0000000..0d19ee7
--- /dev/null
+++ b/src/share/grabbag/cuesheet.c
@@ -0,0 +1,681 @@
+/* grabbag - Convenience lib for various routines common to several tools
+ * Copyright (C) 2002-2009  Josh Coalson
+ * Copyright (C) 2011-2023  Xiph.Org Foundation
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include "FLAC/assert.h"
+#include "share/compat.h"
+#include "share/grabbag.h"
+#include "share/safe_str.h"
+
+uint32_t grabbag__cuesheet_msf_to_frame(uint32_t minutes, uint32_t seconds, uint32_t frames)
+{
+	return ((minutes * 60) + seconds) * 75 + frames;
+}
+
+void grabbag__cuesheet_frame_to_msf(uint32_t frame, uint32_t *minutes, uint32_t *seconds, uint32_t *frames)
+{
+	*frames = frame % 75;
+	frame /= 75;
+	*seconds = frame % 60;
+	frame /= 60;
+	*minutes = frame;
+}
+
+/* since we only care about values >= 0 or error, returns < 0 for any illegal string, else value */
+static FLAC__int64 local__parse_int64_(const char *s)
+{
+	FLAC__int64 ret = 0;
+	char c;
+
+	if(*s == '\0')
+		return -1;
+
+	while('\0' != (c = *s++))
+		if(c >= '0' && c <= '9') {
+			if(ret >= (INT64_MAX / 10))
+				return -1;
+			else
+				ret = ret * 10 + (c - '0');
+		}
+		else
+			return -1;
+
+	return ret;
+}
+
+/* since we only care about values >= 0 or error, returns < 0 for any illegal string, else value */
+static int local__parse_int_(const char *s)
+{
+	FLAC__int64 ret64 = local__parse_int64_(s);
+	if(ret64 < 0 || ret64 > INT_MAX)
+		return -1;
+	return ret64;
+}
+
+/* accept minute:second:frame syntax of '[0-9]+:[0-9][0-9]?:[0-9][0-9]?', but max second of 59 and max frame of 74, e.g. 0:0:0, 123:45:67
+ * return sample number or <0 for error
+ * WATCHOUT: if sample rate is not evenly divisible by 75, the resulting sample number will be approximate
+ */
+static FLAC__int64 local__parse_msf_(const char *s, uint32_t sample_rate)
+{
+	FLAC__int64 ret, field;
+	char c;
+
+	if(sample_rate == 0)
+		return -1;
+
+	c = *s++;
+	if(c >= '0' && c <= '9')
+		field = (c - '0');
+	else
+		return -1;
+	while(':' != (c = *s++)) {
+		if(c >= '0' && c <= '9') {
+			if(field >= (INT64_MAX / 10))
+				return -1;
+			else
+				field = field * 10 + (c - '0');
+		}
+		else
+			return -1;
+	}
+
+	if(field >= INT64_MAX / (60 * sample_rate))
+		return -1;
+	ret = field * 60 * sample_rate;
+
+	c = *s++;
+	if(c >= '0' && c <= '9')
+		field = (c - '0');
+	else
+		return -1;
+	if(':' != (c = *s++)) {
+		if(c >= '0' && c <= '9') {
+			field = field * 10 + (c - '0');
+			c = *s++;
+			if(c != ':')
+				return -1;
+		}
+		else
+			return -1;
+	}
+
+	if(field >= 60)
+		return -1;
+
+	{
+		FLAC__int64 tmp = ret;
+		ret += field * sample_rate;
+		if(ret < tmp)
+			return -1;
+	}
+
+	c = *s++;
+	if(c >= '0' && c <= '9')
+		field = (c - '0');
+	else
+		return -1;
+	if('\0' != (c = *s++)) {
+		if(c >= '0' && c <= '9') {
+			field = field * 10 + (c - '0');
+			c = *s++;
+		}
+		else
+			return -1;
+	}
+
+	if(c != '\0')
+		return -1;
+
+	if(field >= 75)
+		return -1;
+
+	{
+		FLAC__int64 tmp = ret;
+		ret += field * (sample_rate / 75);
+		if(ret < tmp)
+			return -1;
+	}
+
+	return ret;
+}
+
+/* accept minute:second syntax of '[0-9]+:[0-9][0-9]?{,.[0-9]+}', but second < 60, e.g. 0:0.0, 3:5, 15:31.731
+ * return sample number or <0 for error
+ * WATCHOUT: depending on the sample rate, the resulting sample number may be approximate with fractional seconds
+ */
+static FLAC__int64 local__parse_ms_(const char *s, uint32_t sample_rate)
+{
+	FLAC__int64 ret, field;
+	double x;
+	char c, *end;
+
+	if(sample_rate == 0)
+		return -1;
+
+	c = *s++;
+	if(c >= '0' && c <= '9')
+		field = (c - '0');
+	else
+		return -1;
+	while(':' != (c = *s++)) {
+		if(c >= '0' && c <= '9') {
+			if(field >= (INT64_MAX / 10))
+				return -1;
+			else
+				field = field * 10 + (c - '0');
+		}
+		else
+			return -1;
+	}
+
+	if(field >= INT64_MAX / (60 * sample_rate))
+		return -1;
+	ret = field * 60 * sample_rate;
+
+	if(strspn(s, "0123456789.") != strlen(s))
+		return -1;
+	x = strtod(s, &end);
+	if(*end || end == s)
+		return -1;
+	if(x < 0.0 || x >= 60.0)
+		return -1;
+
+	ret += (FLAC__int64)(x * sample_rate);
+
+	return ret;
+}
+
+static char *local__get_field_(char **s, FLAC__bool allow_quotes)
+{
+	FLAC__bool has_quote = false;
+	char *p;
+
+	FLAC__ASSERT(0 != s);
+
+	if(0 == *s)
+		return 0;
+
+	/* skip leading whitespace */
+	while(**s && 0 != strchr(" \t\r\n", **s))
+		(*s)++;
+
+	if(**s == 0) {
+		*s = 0;
+		return 0;
+	}
+
+	if(allow_quotes && (**s == '"')) {
+		has_quote = true;
+		(*s)++;
+		if(**s == 0) {
+			*s = 0;
+			return 0;
+		}
+	}
+
+	p = *s;
+
+	if(has_quote) {
+		*s = strchr(*s, '\"');
+		/* if there is no matching end quote, it's an error */
+		if(0 == *s)
+			p = *s = 0;
+		else {
+			**s = '\0';
+			(*s)++;
+		}
+	}
+	else {
+		while(**s && 0 == strchr(" \t\r\n", **s))
+			(*s)++;
+		if(**s) {
+			**s = '\0';
+			(*s)++;
+		}
+		else
+			*s = 0;
+	}
+
+	return p;
+}
+
+static FLAC__bool local__cuesheet_parse_(FILE *file, const char **error_message, uint32_t *last_line_read, FLAC__StreamMetadata *cuesheet, uint32_t sample_rate, FLAC__bool is_cdda, FLAC__uint64 lead_out_offset)
+{
+	char buffer[4096], *line, *field;
+	uint32_t forced_leadout_track_num = 0;
+	FLAC__uint64 forced_leadout_track_offset = 0;
+	int in_track_num = -1, in_index_num = -1;
+	FLAC__bool disc_has_catalog = false, track_has_flags = false, track_has_isrc = false, has_forced_leadout = false;
+	FLAC__StreamMetadata_CueSheet *cs = &cuesheet->data.cue_sheet;
+
+	FLAC__ASSERT(!is_cdda || sample_rate == 44100);
+	/* double protection */
+	if(is_cdda && sample_rate != 44100) {
+		*error_message = "CD-DA cuesheet only allowed with 44.1kHz sample rate";
+		return false;
+	}
+
+	cs->lead_in = is_cdda? 2 * 44100 /* The default lead-in size for CD-DA */ : 0;
+	cs->is_cd = is_cdda;
+
+	while(0 != fgets(buffer, sizeof(buffer), file)) {
+		(*last_line_read)++;
+		line = buffer;
+
+		{
+			size_t linelen = strlen(line);
+			if((linelen == sizeof(buffer)-1) && line[linelen-1] != '\n') {
+				*error_message = "line too long";
+				return false;
+			}
+		}
+
+		if(0 != (field = local__get_field_(&line, /*allow_quotes=*/false))) {
+			if(0 == FLAC__STRCASECMP(field, "CATALOG")) {
+				if(disc_has_catalog) {
+					*error_message = "found multiple CATALOG commands";
+					return false;
+				}
+				if(0 == (field = local__get_field_(&line, /*allow_quotes=*/true))) {
+					*error_message = "CATALOG is missing catalog number";
+					return false;
+				}
+				if(strlen(field) >= sizeof(cs->media_catalog_number)) {
+					*error_message = "CATALOG number is too long";
+					return false;
+				}
+				if(is_cdda && (strlen(field) != 13 || strspn(field, "0123456789") != 13)) {
+					*error_message = "CD-DA CATALOG number must be 13 decimal digits";
+					return false;
+				}
+				safe_strncpy(cs->media_catalog_number, field, sizeof(cs->media_catalog_number));
+				disc_has_catalog = true;
+			}
+			else if(0 == FLAC__STRCASECMP(field, "FLAGS")) {
+				if(track_has_flags) {
+					*error_message = "found multiple FLAGS commands";
+					return false;
+				}
+				if(in_track_num < 0 || in_index_num >= 0) {
+					*error_message = "FLAGS command must come after TRACK but before INDEX";
+					return false;
+				}
+				while(0 != (field = local__get_field_(&line, /*allow_quotes=*/false))) {
+					if(0 == FLAC__STRCASECMP(field, "PRE"))
+						cs->tracks[cs->num_tracks-1].pre_emphasis = 1;
+				}
+				track_has_flags = true;
+			}
+			else if(0 == FLAC__STRCASECMP(field, "INDEX")) {
+				FLAC__int64 xx;
+				FLAC__StreamMetadata_CueSheet_Track *track = &cs->tracks[cs->num_tracks-1];
+				if(in_track_num < 0) {
+					*error_message = "found INDEX before any TRACK";
+					return false;
+				}
+				if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
+					*error_message = "INDEX is missing index number";
+					return false;
+				}
+				in_index_num = local__parse_int_(field);
+				if(in_index_num < 0) {
+					*error_message = "INDEX has invalid index number";
+					return false;
+				}
+				FLAC__ASSERT(cs->num_tracks > 0);
+				if(track->num_indices == 0) {
+					/* it's the first index point of the track */
+					if(in_index_num > 1) {
+						*error_message = "first INDEX number of a TRACK must be 0 or 1";
+						return false;
+					}
+				}
+				else {
+					if(in_index_num != track->indices[track->num_indices-1].number + 1) {
+						*error_message = "INDEX numbers must be sequential";
+						return false;
+					}
+				}
+				if(is_cdda && in_index_num > 99) {
+					*error_message = "CD-DA INDEX number must be between 0 and 99, inclusive";
+					return false;
+				}
+				/*@@@ search for duplicate track number? */
+				if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
+					*error_message = "INDEX is missing an offset after the index number";
+					return false;
+				}
+				/* first parse as minute:second:frame format */
+				xx = local__parse_msf_(field, sample_rate);
+				if(xx < 0) {
+					/* CD-DA must use only MM:SS:FF format */
+					if(is_cdda) {
+						*error_message = "illegal INDEX offset (not of the form MM:SS:FF)";
+						return false;
+					}
+					/* as an extension for non-CD-DA we allow MM:SS.SS or raw sample number */
+					xx = local__parse_ms_(field, sample_rate);
+					if(xx < 0) {
+						xx = local__parse_int64_(field);
+						if(xx < 0) {
+							*error_message = "illegal INDEX offset";
+							return false;
+						}
+					}
+				}
+				else if(sample_rate % 75 && xx) {
+                                        /* only sample zero is exact */
+					*error_message = "illegal INDEX offset (MM:SS:FF form not allowed if sample rate is not a multiple of 75)";
+					return false;
+				}
+				if(is_cdda && cs->num_tracks == 1 && cs->tracks[0].num_indices == 0 && xx != 0) {
+					*error_message = "first INDEX of first TRACK must have an offset of 00:00:00";
+					return false;
+				}
+				if(is_cdda && track->num_indices > 0 && (FLAC__uint64)xx <= track->indices[track->num_indices-1].offset) {
+					*error_message = "CD-DA INDEX offsets must increase in time";
+					return false;
+				}
+				/* fill in track offset if it's the first index of the track */
+				if(track->num_indices == 0)
+					track->offset = (FLAC__uint64)xx;
+				if(is_cdda && cs->num_tracks > 1) {
+					const FLAC__StreamMetadata_CueSheet_Track *prev = &cs->tracks[cs->num_tracks-2];
+					if((FLAC__uint64)xx <= prev->offset + prev->indices[prev->num_indices-1].offset) {
+						*error_message = "CD-DA INDEX offsets must increase in time";
+						return false;
+					}
+				}
+				if(!FLAC__metadata_object_cuesheet_track_insert_blank_index(cuesheet, cs->num_tracks-1, track->num_indices)) {
+					*error_message = "memory allocation error";
+					return false;
+				}
+				track->indices[track->num_indices-1].offset = (FLAC__uint64)xx - track->offset;
+				track->indices[track->num_indices-1].number = in_index_num;
+			}
+			else if(0 == FLAC__STRCASECMP(field, "ISRC")) {
+				char *l, *r;
+				if(track_has_isrc) {
+					*error_message = "found multiple ISRC commands";
+					return false;
+				}
+				if(in_track_num < 0 || in_index_num >= 0) {
+					*error_message = "ISRC command must come after TRACK but before INDEX";
+					return false;
+				}
+				if(0 == (field = local__get_field_(&line, /*allow_quotes=*/true))) {
+					*error_message = "ISRC is missing ISRC number";
+					return false;
+				}
+				/* strip out dashes */
+				for(l = r = field; *r; r++) {
+					if(*r != '-')
+						*l++ = *r;
+				}
+				*l = '\0';
+				if(strlen(field) != 12 || strspn(field, "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789") < 5 || strspn(field+5, "1234567890") != 7) {
+					*error_message = "invalid ISRC number";
+					return false;
+				}
+				safe_strncpy(cs->tracks[cs->num_tracks-1].isrc, field, sizeof(cs->tracks[cs->num_tracks-1].isrc));
+				track_has_isrc = true;
+			}
+			else if(0 == FLAC__STRCASECMP(field, "TRACK")) {
+				if(cs->num_tracks > 0) {
+					const FLAC__StreamMetadata_CueSheet_Track *prev = &cs->tracks[cs->num_tracks-1];
+					if(
+						prev->num_indices == 0 ||
+						(
+						 	is_cdda &&
+							(
+								(prev->num_indices == 1 && prev->indices[0].number != 1) ||
+								(prev->num_indices == 2 && prev->indices[0].number != 1 && prev->indices[1].number != 1)
+							)
+						)
+					) {
+						*error_message = is_cdda?
+							"previous TRACK must specify at least one INDEX 01" :
+							"previous TRACK must specify at least one INDEX";
+						return false;
+					}
+				}
+				if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
+					*error_message = "TRACK is missing track number";
+					return false;
+				}
+				in_track_num = local__parse_int_(field);
+				if(in_track_num < 0) {
+					*error_message = "TRACK has invalid track number";
+					return false;
+				}
+				if(in_track_num == 0) {
+					*error_message = "TRACK number must be greater than 0";
+					return false;
+				}
+				if(is_cdda) {
+					if(in_track_num > 99) {
+						*error_message = "CD-DA TRACK number must be between 1 and 99, inclusive";
+						return false;
+					}
+				}
+				else {
+					if(in_track_num == 255) {
+						*error_message = "TRACK number 255 is reserved for the lead-out";
+						return false;
+					}
+					else if(in_track_num > 255) {
+						*error_message = "TRACK number must be between 1 and 254, inclusive";
+						return false;
+					}
+				}
+				if(is_cdda && cs->num_tracks > 0 && in_track_num != cs->tracks[cs->num_tracks-1].number + 1) {
+					*error_message = "CD-DA TRACK numbers must be sequential";
+					return false;
+				}
+				/*@@@ search for duplicate track number? */
+				if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
+					*error_message = "TRACK is missing a track type after the track number";
+					return false;
+				}
+				if(!FLAC__metadata_object_cuesheet_insert_blank_track(cuesheet, cs->num_tracks)) {
+					*error_message = "memory allocation error";
+					return false;
+				}
+				cs->tracks[cs->num_tracks-1].number = in_track_num;
+				cs->tracks[cs->num_tracks-1].type = (0 == FLAC__STRCASECMP(field, "AUDIO"))? 0 : 1; /*@@@ should we be more strict with the value here? */
+				in_index_num = -1;
+				track_has_flags = false;
+				track_has_isrc = false;
+			}
+			else if(0 == FLAC__STRCASECMP(field, "REM")) {
+				if(0 != (field = local__get_field_(&line, /*allow_quotes=*/false))) {
+					if(0 == strcmp(field, "FLAC__lead-in")) {
+						FLAC__int64 xx;
+						if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
+							*error_message = "FLAC__lead-in is missing offset";
+							return false;
+						}
+						xx = local__parse_int64_(field);
+						if(xx < 0) {
+							*error_message = "illegal FLAC__lead-in offset";
+							return false;
+						}
+						if(is_cdda && xx % 588 != 0) {
+							*error_message = "illegal CD-DA FLAC__lead-in offset, must be even multiple of 588 samples";
+							return false;
+						}
+						cs->lead_in = (FLAC__uint64)xx;
+					}
+					else if(0 == strcmp(field, "FLAC__lead-out")) {
+						int track_num;
+						FLAC__int64 offset;
+						if(has_forced_leadout) {
+							*error_message = "multiple FLAC__lead-out commands";
+							return false;
+						}
+						if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
+							*error_message = "FLAC__lead-out is missing track number";
+							return false;
+						}
+						track_num = local__parse_int_(field);
+						if(track_num < 0) {
+							*error_message = "illegal FLAC__lead-out track number";
+							return false;
+						}
+						forced_leadout_track_num = (uint32_t)track_num;
+						/*@@@ search for duplicate track number? */
+						if(0 == (field = local__get_field_(&line, /*allow_quotes=*/false))) {
+							*error_message = "FLAC__lead-out is missing offset";
+							return false;
+						}
+						offset = local__parse_int64_(field);
+						if(offset < 0) {
+							*error_message = "illegal FLAC__lead-out offset";
+							return false;
+						}
+						forced_leadout_track_offset = (FLAC__uint64)offset;
+						if(forced_leadout_track_offset != lead_out_offset) {
+							*error_message = "FLAC__lead-out offset does not match end-of-stream offset";
+							return false;
+						}
+						has_forced_leadout = true;
+					}
+				}
+			}
+		}
+	}
+
+	if(cs->num_tracks == 0) {
+		*error_message = "there must be at least one TRACK command";
+		return false;
+	}
+	else {
+		const FLAC__StreamMetadata_CueSheet_Track *prev = &cs->tracks[cs->num_tracks-1];
+		if(
+			prev->num_indices == 0 ||
+			(
+				is_cdda &&
+				(
+					(prev->num_indices == 1 && prev->indices[0].number != 1) ||
+					(prev->num_indices == 2 && prev->indices[0].number != 1 && prev->indices[1].number != 1)
+				)
+			)
+		) {
+			*error_message = is_cdda?
+				"previous TRACK must specify at least one INDEX 01" :
+				"previous TRACK must specify at least one INDEX";
+			return false;
+		}
+	}
+
+	if(!has_forced_leadout) {
+		forced_leadout_track_num = is_cdda? 170 : 255;
+		forced_leadout_track_offset = lead_out_offset;
+	}
+	if(!FLAC__metadata_object_cuesheet_insert_blank_track(cuesheet, cs->num_tracks)) {
+		*error_message = "memory allocation error";
+		return false;
+	}
+	cs->tracks[cs->num_tracks-1].number = forced_leadout_track_num;
+	cs->tracks[cs->num_tracks-1].offset = forced_leadout_track_offset;
+
+	if(!feof(file)) {
+		*error_message = "read error";
+		return false;
+	}
+	return true;
+}
+
+FLAC__StreamMetadata *grabbag__cuesheet_parse(FILE *file, const char **error_message, uint32_t *last_line_read, uint32_t sample_rate, FLAC__bool is_cdda, FLAC__uint64 lead_out_offset)
+{
+	FLAC__StreamMetadata *cuesheet;
+
+	FLAC__ASSERT(0 != file);
+	FLAC__ASSERT(0 != error_message);
+	FLAC__ASSERT(0 != last_line_read);
+
+	*last_line_read = 0;
+	cuesheet = FLAC__metadata_object_new(FLAC__METADATA_TYPE_CUESHEET);
+
+	if(0 == cuesheet) {
+		*error_message = "memory allocation error";
+		return 0;
+	}
+
+	if(!local__cuesheet_parse_(file, error_message, last_line_read, cuesheet, sample_rate, is_cdda, lead_out_offset)) {
+		FLAC__metadata_object_delete(cuesheet);
+		return 0;
+	}
+
+	return cuesheet;
+}
+
+void grabbag__cuesheet_emit(FILE *file, const FLAC__StreamMetadata *cuesheet, const char *file_reference)
+{
+	const FLAC__StreamMetadata_CueSheet *cs;
+	uint32_t track_num, index_num;
+
+	FLAC__ASSERT(0 != file);
+	FLAC__ASSERT(0 != cuesheet);
+	FLAC__ASSERT(cuesheet->type == FLAC__METADATA_TYPE_CUESHEET);
+
+	cs = &cuesheet->data.cue_sheet;
+
+	if(*(cs->media_catalog_number))
+		fprintf(file, "CATALOG %s\n", cs->media_catalog_number);
+	fprintf(file, "FILE %s\n", file_reference);
+
+	FLAC__ASSERT(cs->num_tracks > 0);
+
+	for(track_num = 0; track_num < cs->num_tracks-1; track_num++) {
+		const FLAC__StreamMetadata_CueSheet_Track *track = cs->tracks + track_num;
+
+		fprintf(file, "  TRACK %02u %s\n", (uint32_t)track->number, track->type == 0? "AUDIO" : "DATA");
+
+		if(track->pre_emphasis)
+			fprintf(file, "    FLAGS PRE\n");
+		if(*(track->isrc))
+			fprintf(file, "    ISRC %s\n", track->isrc);
+
+		for(index_num = 0; index_num < track->num_indices; index_num++) {
+			const FLAC__StreamMetadata_CueSheet_Index *indx = track->indices + index_num;
+
+			fprintf(file, "    INDEX %02u ", (uint32_t)indx->number);
+			if(cs->is_cd) {
+				const uint32_t logical_frame = (uint32_t)((track->offset + indx->offset) / (44100 / 75));
+				uint32_t m, s, f;
+				grabbag__cuesheet_frame_to_msf(logical_frame, &m, &s, &f);
+				fprintf(file, "%02u:%02u:%02u\n", m, s, f);
+			}
+			else
+				fprintf(file, "%" PRIu64 "\n", (track->offset + indx->offset));
+		}
+	}
+
+	fprintf(file, "REM FLAC__lead-in %" PRIu64 "\n", cs->lead_in);
+	fprintf(file, "REM FLAC__lead-out %u %" PRIu64 "\n", (uint32_t)cs->tracks[track_num].number, cs->tracks[track_num].offset);
+}
diff --git a/src/share/grabbag/file.c b/src/share/grabbag/file.c
new file mode 100644
index 0000000..307645f
--- /dev/null
+++ b/src/share/grabbag/file.c
@@ -0,0 +1,207 @@
+/* grabbag - Convenience lib for various routines common to several tools
+ * Copyright (C) 2002-2009  Josh Coalson
+ * Copyright (C) 2011-2023  Xiph.Org Foundation
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#if defined _MSC_VER || defined __MINGW32__
+#include <sys/utime.h> /* for utime() */
+#include <io.h> /* for chmod(), _setmode(), unlink() */
+#include <fcntl.h> /* for _O_BINARY */
+#else
+#include <sys/types.h> /* some flavors of BSD (like OS X) require this to get time_t */
+#endif
+#if defined __EMX__
+#include <io.h> /* for setmode(), O_BINARY */
+#include <fcntl.h> /* for _O_BINARY */
+#endif
+#include <sys/stat.h> /* for stat(), maybe chmod() */
+#if defined _WIN32 && !defined __CYGWIN__
+#else
+#include <unistd.h> /* for unlink() */
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h> /* for strrchr() */
+#if defined _WIN32 && !defined __CYGWIN__
+// for GetFileInformationByHandle() etc
+#include <windows.h>
+#include <winbase.h>
+#endif
+#include "share/grabbag.h"
+#include "share/compat.h"
+
+
+void grabbag__file_copy_metadata(const char *srcpath, const char *destpath)
+{
+	struct flac_stat_s srcstat;
+
+	if(0 == flac_stat(srcpath, &srcstat)) {
+#if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 200809L) && !defined(_WIN32)
+		struct timespec srctime[2] = {};
+		srctime[0].tv_sec = srcstat.st_atime;
+		srctime[1].tv_sec = srcstat.st_mtime;
+#else
+		struct utimbuf srctime;
+		srctime.actime = srcstat.st_atime;
+		srctime.modtime = srcstat.st_mtime;
+#endif
+		(void)flac_chmod(destpath, srcstat.st_mode);
+		(void)flac_utime(destpath, &srctime);
+	}
+}
+
+FLAC__off_t grabbag__file_get_filesize(const char *srcpath)
+{
+	struct flac_stat_s srcstat;
+
+	if(0 == flac_stat(srcpath, &srcstat))
+		return srcstat.st_size;
+	else
+		return -1;
+}
+
+const char *grabbag__file_get_basename(const char *srcpath)
+{
+	const char *p;
+
+	p = strrchr(srcpath, '/');
+	if(0 == p) {
+#if defined _WIN32 && !defined __CYGWIN__
+		p = strrchr(srcpath, '\\');
+		if(0 == p)
+#endif
+			return srcpath;
+	}
+	return ++p;
+}
+
+FLAC__bool grabbag__file_change_stats(const char *filename, FLAC__bool read_only)
+{
+	struct flac_stat_s stats;
+
+	if(0 == flac_stat(filename, &stats)) {
+#if !defined _MSC_VER && !defined __MINGW32__
+		if(read_only) {
+			stats.st_mode &= ~S_IWUSR;
+			stats.st_mode &= ~S_IWGRP;
+			stats.st_mode &= ~S_IWOTH;
+		}
+		else {
+			stats.st_mode |= S_IWUSR;
+		}
+#else
+		if(read_only)
+			stats.st_mode &= ~S_IWRITE;
+		else
+			stats.st_mode |= S_IWRITE;
+#endif
+		if(0 != flac_chmod(filename, stats.st_mode))
+			return false;
+	}
+	else
+		return false;
+
+	return true;
+}
+
+FLAC__bool grabbag__file_are_same(const char *f1, const char *f2)
+{
+#if defined _WIN32 && !defined __CYGWIN__
+#if !defined(WINAPI_FAMILY_PARTITION)
+#define WINAPI_FAMILY_PARTITION(x) x
+#define WINAPI_PARTITION_DESKTOP 1
+#endif
+	/* see
+	 *  http://www.hydrogenaudio.org/forums/index.php?showtopic=49439&pid=444300&st=0
+	 *  http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/fs/getfileinformationbyhandle.asp
+	 *  http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/fs/by_handle_file_information_str.asp
+	 *  http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/fs/createfile.asp
+	 * apparently both the files have to be open at the same time for the comparison to work
+	 */
+	FLAC__bool same = false;
+	BY_HANDLE_FILE_INFORMATION info1, info2;
+	HANDLE h1, h2;
+	BOOL ok = 1;
+	h1 = CreateFile_utf8(f1, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+	h2 = CreateFile_utf8(f2, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+	if(h1 == INVALID_HANDLE_VALUE || h2 == INVALID_HANDLE_VALUE)
+		ok = 0;
+#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+	ok &= GetFileInformationByHandle(h1, &info1);
+	ok &= GetFileInformationByHandle(h2, &info2);
+	if(ok)
+		same =
+			info1.dwVolumeSerialNumber == info2.dwVolumeSerialNumber &&
+			info1.nFileIndexHigh == info2.nFileIndexHigh &&
+			info1.nFileIndexLow == info2.nFileIndexLow
+		;
+#else // !WINAPI_PARTITION_DESKTOP
+	FILE_ID_INFO id_info1, id_info2;
+	same = GetFileInformationByHandleEx(h1, FileIdInfo, &id_info1, sizeof (id_info1)) &&
+	       GetFileInformationByHandleEx(h2, FileIdInfo, &id_info2, sizeof (id_info2)) &&
+	       id_info1.VolumeSerialNumber == id_info2.VolumeSerialNumber &&
+	       memcmp(&id_info1.FileId, &id_info2.FileId, sizeof(id_info1.FileId)) == 0;
+#endif // !WINAPI_PARTITION_DESKTOP
+	if(h1 != INVALID_HANDLE_VALUE)
+		CloseHandle(h1);
+	if(h2 != INVALID_HANDLE_VALUE)
+		CloseHandle(h2);
+	return same;
+#else
+	struct flac_stat_s s1, s2;
+	return f1 && f2 && flac_stat(f1, &s1) == 0 && flac_stat(f2, &s2) == 0 && s1.st_ino == s2.st_ino && s1.st_dev == s2.st_dev;
+#endif
+}
+
+FLAC__bool grabbag__file_remove_file(const char *filename)
+{
+	return grabbag__file_change_stats(filename, /*read_only=*/false) && 0 == flac_unlink(filename);
+}
+
+FILE *grabbag__file_get_binary_stdin(void)
+{
+	/* if something breaks here it is probably due to the presence or
+	 * absence of an underscore before the identifiers 'setmode',
+	 * 'fileno', and/or 'O_BINARY'; check your system header files.
+	 */
+#if defined _MSC_VER || defined __MINGW32__
+	_setmode(_fileno(stdin), _O_BINARY);
+#elif defined __EMX__
+	setmode(fileno(stdin), O_BINARY);
+#endif
+
+	return stdin;
+}
+
+FILE *grabbag__file_get_binary_stdout(void)
+{
+	/* if something breaks here it is probably due to the presence or
+	 * absence of an underscore before the identifiers 'setmode',
+	 * 'fileno', and/or 'O_BINARY'; check your system header files.
+	 */
+#if defined _MSC_VER || defined __MINGW32__
+	_setmode(_fileno(stdout), _O_BINARY);
+#elif defined __EMX__
+	setmode(fileno(stdout), O_BINARY);
+#endif
+
+	return stdout;
+}
diff --git a/src/share/grabbag/picture.c b/src/share/grabbag/picture.c
new file mode 100644
index 0000000..9a4aafe
--- /dev/null
+++ b/src/share/grabbag/picture.c
@@ -0,0 +1,515 @@
+/* grabbag - Convenience lib for various routines common to several tools
+ * Copyright (C) 2006-2009  Josh Coalson
+ * Copyright (C) 2011-2023  Xiph.Org Foundation
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include "share/alloc.h"
+#include "share/grabbag.h"
+#include "FLAC/assert.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "share/compat.h"
+#include "share/safe_str.h"
+
+/* slightly different that strndup(): this always copies 'size' bytes starting from s into a NUL-terminated string. */
+static char *local__strndup_(const char *s, size_t size)
+{
+	char *x = safe_malloc_add_2op_(size, /*+*/1);
+	if(x) {
+		memcpy(x, s, size);
+		x[size] = '\0';
+	}
+	return x;
+}
+
+static FLAC__bool local__parse_type_(const char *s, size_t len, FLAC__StreamMetadata_Picture *picture)
+{
+	size_t i;
+	FLAC__uint32 val = 0;
+
+	picture->type = FLAC__STREAM_METADATA_PICTURE_TYPE_FRONT_COVER;
+
+	if(len == 0)
+		return true; /* empty string implies default to 'front cover' */
+
+	for(i = 0; i < len; i++) {
+		if(s[i] >= '0' && s[i] <= '9')
+			val = 10*val + (FLAC__uint32)(s[i] - '0');
+		else
+			return false;
+	}
+
+	if(i == len)
+		picture->type = val;
+	else
+		return false;
+
+	return true;
+}
+
+static FLAC__bool local__parse_resolution_(const char *s, size_t len, FLAC__StreamMetadata_Picture *picture)
+{
+	int state = 0;
+	size_t i;
+	FLAC__uint32 val = 0;
+
+	picture->width = picture->height = picture->depth = picture->colors = 0;
+
+	if(len == 0)
+		return true; /* empty string implies client wants to get info from the file itself */
+
+	for(i = 0; i < len; i++) {
+		if(s[i] == 'x') {
+			if(state == 0)
+				picture->width = val;
+			else if(state == 1)
+				picture->height = val;
+			else
+				return false;
+			state++;
+			val = 0;
+		}
+		else if(s[i] == '/') {
+			if(state == 2)
+				picture->depth = val;
+			else
+				return false;
+			state++;
+			val = 0;
+		}
+		else if(s[i] >= '0' && s[i] <= '9')
+			val = 10*val + (FLAC__uint32)(s[i] - '0');
+		else
+			return false;
+	}
+
+	if(state < 2)
+		return false;
+	else if(state == 2)
+		picture->depth = val;
+	else if(state == 3)
+		picture->colors = val;
+	else
+		return false;
+	if(picture->depth < 32 && 1u<<picture->depth < picture->colors)
+		return false;
+
+	return true;
+}
+
+static FLAC__bool local__extract_mime_type_(FLAC__StreamMetadata *obj)
+{
+	if(obj->data.picture.data_length >= 8 && 0 == memcmp(obj->data.picture.data, "\x89PNG\x0d\x0a\x1a\x0a", 8))
+		return FLAC__metadata_object_picture_set_mime_type(obj, "image/png", /*copy=*/true);
+	else if(obj->data.picture.data_length >= 6 && (0 == memcmp(obj->data.picture.data, "GIF87a", 6) || 0 == memcmp(obj->data.picture.data, "GIF89a", 6)))
+		return FLAC__metadata_object_picture_set_mime_type(obj, "image/gif", /*copy=*/true);
+	else if(obj->data.picture.data_length >= 2 && 0 == memcmp(obj->data.picture.data, "\xff\xd8", 2))
+		return FLAC__metadata_object_picture_set_mime_type(obj, "image/jpeg", /*copy=*/true);
+	return false;
+}
+
+static FLAC__bool local__extract_resolution_color_info_(FLAC__StreamMetadata_Picture *picture)
+{
+	const FLAC__byte *data = picture->data;
+	FLAC__uint32 len = picture->data_length;
+
+	if(0 == strcmp(picture->mime_type, "image/png")) {
+		/* c.f. http://www.w3.org/TR/PNG/ */
+		FLAC__bool need_palette = false; /* if IHDR has color_type=3, we need to also read the PLTE chunk to get the #colors */
+		if(len < 8 || memcmp(data, "\x89PNG\x0d\x0a\x1a\x0a", 8))
+			return false;
+		/* try to find IHDR chunk */
+		data += 8;
+		len -= 8;
+		while(len > 12) { /* every PNG chunk must be at least 12 bytes long */
+			const FLAC__uint32 clen = (FLAC__uint32)data[0] << 24 | (FLAC__uint32)data[1] << 16 | (FLAC__uint32)data[2] << 8 | (FLAC__uint32)data[3];
+			/* First check whether clen makes sense or causes overflow in this bit of code */
+			if(clen + 12 <= clen || clen + 12 > len)
+				return false;
+			else if(0 == memcmp(data+4, "IHDR", 4) && clen == 13) {
+				uint32_t color_type = data[17];
+				picture->width = (FLAC__uint32)data[8] << 24 | (FLAC__uint32)data[9] << 16 | (FLAC__uint32)data[10] << 8 | (FLAC__uint32)data[11];
+				picture->height = (FLAC__uint32)data[12] << 24 | (FLAC__uint32)data[13] << 16 | (FLAC__uint32)data[14] << 8 | (FLAC__uint32)data[15];
+				if(color_type == 3) {
+					/* even though the bit depth for color_type==3 can be 1,2,4,or 8,
+					 * the spec in 11.2.2 of http://www.w3.org/TR/PNG/ says that the
+					 * sample depth is always 8
+					 */
+					picture->depth = 8 * 3u;
+					need_palette = true;
+					data += 12 + clen;
+					len -= 12 + clen;
+				}
+				else {
+					if(color_type == 0) /* greyscale, 1 sample per pixel */
+						picture->depth = (FLAC__uint32)data[16];
+					if(color_type == 2) /* truecolor, 3 samples per pixel */
+						picture->depth = (FLAC__uint32)data[16] * 3u;
+					if(color_type == 4) /* greyscale+alpha, 2 samples per pixel */
+						picture->depth = (FLAC__uint32)data[16] * 2u;
+					if(color_type == 6) /* truecolor+alpha, 4 samples per pixel */
+						picture->depth = (FLAC__uint32)data[16] * 4u;
+					picture->colors = 0;
+					return true;
+				}
+			}
+			else if(need_palette && 0 == memcmp(data+4, "PLTE", 4)) {
+				picture->colors = clen / 3u;
+				return true;
+			}
+			else {
+				data += 12 + clen;
+				len -= 12 + clen;
+			}
+		}
+	}
+	else if(0 == strcmp(picture->mime_type, "image/jpeg")) {
+		/* c.f. http://www.w3.org/Graphics/JPEG/itu-t81.pdf and Q22 of http://www.faqs.org/faqs/jpeg-faq/part1/ */
+		if(len < 2 || memcmp(data, "\xff\xd8", 2))
+			return false;
+		data += 2;
+		len -= 2;
+		while(1) {
+			/* look for sync FF byte */
+			for( ; len > 0; data++, len--) {
+				if(*data == 0xff)
+					break;
+			}
+			if(len == 0)
+				return false;
+			/* eat any extra pad FF bytes before marker */
+			for( ; len > 0; data++, len--) {
+				if(*data != 0xff)
+					break;
+			}
+			if(len == 0)
+				return false;
+			/* if we hit SOS or EOI, bail */
+			if(*data == 0xda || *data == 0xd9)
+				return false;
+			/* looking for some SOFn */
+			else if(memchr("\xc0\xc1\xc2\xc3\xc5\xc6\xc7\xc9\xca\xcb\xcd\xce\xcf", *data, 13)) {
+				data++; len--; /* skip marker byte */
+				if(len < 2)
+					return false;
+				else {
+					const FLAC__uint32 clen = (FLAC__uint32)data[0] << 8 | (FLAC__uint32)data[1];
+					if(clen < 8 || len < clen)
+						return false;
+					picture->width = (FLAC__uint32)data[5] << 8 | (FLAC__uint32)data[6];
+					picture->height = (FLAC__uint32)data[3] << 8 | (FLAC__uint32)data[4];
+					picture->depth = (FLAC__uint32)data[2] * (FLAC__uint32)data[7];
+					picture->colors = 0;
+					return true;
+				}
+			}
+			/* else skip it */
+			else {
+				data++; len--; /* skip marker byte */
+				if(len < 2)
+					return false;
+				else {
+					const FLAC__uint32 clen = (FLAC__uint32)data[0] << 8 | (FLAC__uint32)data[1];
+					if(clen < 2 || len < clen)
+						return false;
+					data += clen;
+					len -= clen;
+				}
+			}
+		}
+	}
+	else if(0 == strcmp(picture->mime_type, "image/gif")) {
+		/* c.f. http://www.w3.org/Graphics/GIF/spec-gif89a.txt */
+		if(len < 14)
+			return false;
+		if(memcmp(data, "GIF87a", 6) && memcmp(data, "GIF89a", 6))
+			return false;
+#if 0
+		/* according to the GIF spec, even if the GCTF is 0, the low 3 bits should still tell the total # colors used */
+		if(data[10] & 0x80 == 0)
+			return false;
+#endif
+		picture->width = (FLAC__uint32)data[6] | ((FLAC__uint32)data[7] << 8);
+		picture->height = (FLAC__uint32)data[8] | ((FLAC__uint32)data[9] << 8);
+#if 0
+		/* this value doesn't seem to be reliable... */
+		picture->depth = (((FLAC__uint32)(data[10] & 0x70) >> 4) + 1) * 3u;
+#else
+		/* ...just pessimistically assume it's 24-bit color without scanning all the color tables */
+		picture->depth = 8u * 3u;
+#endif
+		picture->colors = 1u << ((FLAC__uint32)(data[10] & 0x07) + 1u);
+		return true;
+	}
+	return false;
+}
+
+static const char *error_messages[] = {
+	"memory allocation error",
+	"invalid picture specification",
+	"invalid picture specification: can't parse resolution/color part",
+	"unable to extract resolution and color info from URL, user must set explicitly",
+	"unable to extract resolution and color info from file, user must set explicitly",
+	"error opening picture file",
+	"error reading picture file",
+	"invalid picture type",
+	"unable to guess MIME type from file, user must set explicitly",
+	"type 1 icon must be a 32x32 pixel PNG",
+	"file not found", /* currently unused */
+	"file is too large",
+	"empty file"
+};
+
+static const char * read_file (const char * filepath, FLAC__StreamMetadata * obj)
+{
+	const FLAC__off_t size = grabbag__file_get_filesize(filepath);
+	FLAC__byte *buffer;
+	FILE *file;
+	const char *error_message=NULL;
+
+	if (size < 0)
+		return error_messages[5];
+
+	if (size == 0)
+		return error_messages[12];
+
+	if (size >= (FLAC__off_t)(1u << FLAC__STREAM_METADATA_LENGTH_LEN)) /* actual limit is less because of other fields in the PICTURE metadata block */
+		return error_messages[11];
+
+	if ((buffer = safe_malloc_(size)) == NULL)
+		return error_messages[0];
+
+	if ((file = flac_fopen(filepath, "rb")) == NULL) {
+		free(buffer);
+		return error_messages[5];
+	}
+
+	if (fread(buffer, 1, size, file) != (size_t) size) {
+		fclose(file);
+		free(buffer);
+		return error_messages[6];
+	}
+	fclose(file);
+
+	if (!FLAC__metadata_object_picture_set_data(obj, buffer, (FLAC__uint32)size, /*copy=*/false))
+		error_message = error_messages[6];
+	/* try to extract MIME type if user left it blank */
+	else if (*obj->data.picture.mime_type == '\0' && !local__extract_mime_type_(obj))
+		error_message = error_messages[8];
+	/* try to extract resolution/color info if user left it blank */
+	else if ((obj->data.picture.width == 0 || obj->data.picture.height == 0 || obj->data.picture.depth == 0) && !local__extract_resolution_color_info_(&obj->data.picture))
+		error_message = error_messages[4];
+	/* check metadata block size */
+	else if (obj->length >= (1u << FLAC__STREAM_METADATA_LENGTH_LEN))
+		error_message = error_messages[11];
+
+	return error_message;
+}
+
+FLAC__StreamMetadata *grabbag__picture_parse_specification(const char *spec, const char **error_message)
+{
+	FLAC__StreamMetadata *obj;
+	int state = 0;
+
+	FLAC__ASSERT(0 != spec);
+	FLAC__ASSERT(0 != error_message);
+
+	/* double protection */
+	if(0 == spec)
+		return 0;
+	if(0 == error_message)
+		return 0;
+
+	*error_message = 0;
+
+	if(0 == (obj = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PICTURE))) {
+		*error_message = error_messages[0];
+		return obj;
+	}
+
+	if(strchr(spec, '|')) { /* full format */
+		const char *p;
+		char *q;
+		for(p = spec; *error_message==0 && *p; ) {
+			if(*p == '|') {
+				switch(state) {
+					case 0: /* type */
+						if(!local__parse_type_(spec, p-spec, &obj->data.picture))
+							*error_message = error_messages[7];
+						break;
+					case 1: /* mime type */
+						if(p-spec) { /* if blank, we'll try to guess later from the picture data */
+							if(0 == (q = local__strndup_(spec, p-spec)))
+								*error_message = error_messages[0];
+							else if(!FLAC__metadata_object_picture_set_mime_type(obj, q, /*copy=*/false))
+								*error_message = error_messages[0];
+						}
+						break;
+					case 2: /* description */
+						if(0 == (q = local__strndup_(spec, p-spec)))
+							*error_message = error_messages[0];
+						else if(!FLAC__metadata_object_picture_set_description(obj, (FLAC__byte*)q, /*copy=*/false))
+							*error_message = error_messages[0];
+						break;
+					case 3: /* resolution/color (e.g. [300x300x16[/1234]] */
+						if(!local__parse_resolution_(spec, p-spec, &obj->data.picture))
+							*error_message = error_messages[2];
+						break;
+					default:
+						*error_message = error_messages[1];
+						break;
+				}
+				p++;
+				spec = p;
+				state++;
+			}
+			else
+				p++;
+		}
+	}
+	else { /* simple format, filename only, everything else guessed */
+		if(!local__parse_type_("", 0, &obj->data.picture)) /* use default picture type */
+			*error_message = error_messages[7];
+		/* leave MIME type to be filled in later */
+		/* leave description empty */
+		/* leave the rest to be filled in later: */
+		else if(!local__parse_resolution_("", 0, &obj->data.picture))
+			*error_message = error_messages[2];
+		else
+			state = 4;
+	}
+
+	/* parse filename, read file, try to extract resolution/color info if needed */
+	if(*error_message == 0) {
+		if(state != 4)
+			*error_message = error_messages[1];
+		else { /* 'spec' points to filename/URL */
+			if(0 == strcmp(obj->data.picture.mime_type, "-->")) { /* magic MIME type means URL */
+				if(strlen(spec) == 0)
+					*error_message = error_messages[1];
+				else if(!FLAC__metadata_object_picture_set_data(obj, (FLAC__byte*)spec, strlen(spec), /*copy=*/true))
+					*error_message = error_messages[0];
+				else if(obj->data.picture.width == 0 || obj->data.picture.height == 0 || obj->data.picture.depth == 0)
+					*error_message = error_messages[3];
+			}
+			else { /* regular picture file */
+				*error_message = read_file (spec, obj);
+			}
+		}
+	}
+
+	if(*error_message == 0) {
+		if(
+			obj->data.picture.type == FLAC__STREAM_METADATA_PICTURE_TYPE_FILE_ICON_STANDARD &&
+			(
+				(strcmp(obj->data.picture.mime_type, "image/png") && strcmp(obj->data.picture.mime_type, "-->")) ||
+				obj->data.picture.width != 32 ||
+				obj->data.picture.height != 32
+			)
+		)
+			*error_message = error_messages[9];
+	}
+
+	if(*error_message && obj) {
+		FLAC__metadata_object_delete(obj);
+		obj = 0;
+	}
+
+	return obj;
+}
+
+FLAC__StreamMetadata *grabbag__picture_from_specification(int type, const char *mime_type_in, const char * description,
+		const PictureResolution * res, const char * filepath, const char **error_message)
+{
+
+	FLAC__StreamMetadata *obj;
+	char mime_type [64] ;
+
+	if (error_message == 0)
+		return 0;
+
+	safe_strncpy(mime_type, mime_type_in, sizeof (mime_type));
+
+	*error_message = 0;
+
+	if ((obj = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PICTURE)) == 0) {
+		*error_message = error_messages[0];
+		return obj;
+	}
+
+	/* Picture type if known. */
+	obj->data.picture.type = type >= 0 ? type : FLAC__STREAM_METADATA_PICTURE_TYPE_FRONT_COVER;
+
+	/* Mime type if known. */
+	if (mime_type_in && ! FLAC__metadata_object_picture_set_mime_type(obj, mime_type, /*copy=*/true)) {
+		*error_message = error_messages[0];
+		return obj;
+	}
+
+	/* Description if present. */
+	if (description && ! FLAC__metadata_object_picture_set_description(obj, (FLAC__byte*) description, /*copy=*/true)) {
+		*error_message = error_messages[0];
+		return obj;
+	}
+
+	if (res == NULL) {
+		obj->data.picture.width = 0;
+		obj->data.picture.height = 0;
+		obj->data.picture.depth = 0;
+		obj->data.picture.colors = 0;
+	}
+	else {
+		obj->data.picture.width = res->width;
+		obj->data.picture.height = res->height;
+		obj->data.picture.depth = res->depth;
+		obj->data.picture.colors = res->colors;
+	}
+
+	if (strcmp(obj->data.picture.mime_type, "-->") == 0) { /* magic MIME type means URL */
+		if (!FLAC__metadata_object_picture_set_data(obj, (FLAC__byte*)filepath, strlen(filepath), /*copy=*/true))
+			*error_message = error_messages[0];
+		else if (obj->data.picture.width == 0 || obj->data.picture.height == 0 || obj->data.picture.depth == 0)
+			*error_message = error_messages[3];
+	}
+	else {
+		*error_message = read_file (filepath, obj);
+	}
+
+	if (*error_message == NULL) {
+		if (
+			obj->data.picture.type == FLAC__STREAM_METADATA_PICTURE_TYPE_FILE_ICON_STANDARD &&
+			(
+				(strcmp(obj->data.picture.mime_type, "image/png") && strcmp(obj->data.picture.mime_type, "-->")) ||
+				obj->data.picture.width != 32 ||
+				obj->data.picture.height != 32
+			)
+		)
+			*error_message = error_messages[9];
+	}
+
+	if (*error_message && obj) {
+		FLAC__metadata_object_delete(obj);
+		obj = 0;
+	}
+
+	return obj;
+}
diff --git a/src/share/grabbag/replaygain.c b/src/share/grabbag/replaygain.c
new file mode 100644
index 0000000..32c9603
--- /dev/null
+++ b/src/share/grabbag/replaygain.c
@@ -0,0 +1,669 @@
+/* grabbag - Convenience lib for various routines common to several tools
+ * Copyright (C) 2002-2009  Josh Coalson
+ * Copyright (C) 2011-2023  Xiph.Org Foundation
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <locale.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#if defined _MSC_VER || defined __MINGW32__
+#include <io.h> /* for chmod() */
+#endif
+#include <sys/stat.h> /* for stat(), maybe chmod() */
+
+#include "FLAC/assert.h"
+#include "FLAC/metadata.h"
+#include "FLAC/stream_decoder.h"
+#include "share/grabbag.h"
+#include "share/replaygain_analysis.h"
+#include "share/safe_str.h"
+
+#ifdef local_min
+#undef local_min
+#endif
+#define local_min(a,b) ((a)<(b)?(a):(b))
+
+#ifdef local_max
+#undef local_max
+#endif
+#define local_max(a,b) ((a)>(b)?(a):(b))
+
+#ifdef abs32
+#undef abs32
+#endif
+#define abs32(a) (((a)==INT32_MIN)?INT32_MAX:abs(a))
+
+static const char *reference_format_ = "%s=%2.1f dB";
+static const char *gain_format_ = "%s=%+2.2f dB";
+static const char *peak_format_ = "%s=%1.8f";
+
+static double album_peak_, title_peak_;
+
+const uint32_t GRABBAG__REPLAYGAIN_MAX_TAG_SPACE_REQUIRED = 190;
+/*
+	FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 29 + 1 + 8 +
+	FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 21 + 1 + 10 +
+	FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 21 + 1 + 12 +
+	FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 21 + 1 + 10 +
+	FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 21 + 1 + 12
+*/
+
+const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_REFERENCE_LOUDNESS = (const FLAC__byte * const)"REPLAYGAIN_REFERENCE_LOUDNESS";
+const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_TITLE_GAIN = (const FLAC__byte * const)"REPLAYGAIN_TRACK_GAIN";
+const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_TITLE_PEAK = (const FLAC__byte * const)"REPLAYGAIN_TRACK_PEAK";
+const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_ALBUM_GAIN = (const FLAC__byte * const)"REPLAYGAIN_ALBUM_GAIN";
+const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_ALBUM_PEAK = (const FLAC__byte * const)"REPLAYGAIN_ALBUM_PEAK";
+
+
+static FLAC__bool get_file_stats_(const char *filename, struct flac_stat_s *stats)
+{
+	FLAC__ASSERT(0 != filename);
+	FLAC__ASSERT(0 != stats);
+	return (0 == flac_stat(filename, stats));
+}
+
+static void set_file_stats_(const char *filename, struct flac_stat_s *stats)
+{
+	FLAC__ASSERT(0 != filename);
+	FLAC__ASSERT(0 != stats);
+
+	(void)flac_chmod(filename, stats->st_mode);
+}
+
+static FLAC__bool append_tag_(FLAC__StreamMetadata *block, const char *format, const FLAC__byte *name, float value)
+{
+	char buffer[256];
+	char *saved_locale;
+	FLAC__StreamMetadata_VorbisComment_Entry entry;
+
+	FLAC__ASSERT(0 != block);
+	FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
+	FLAC__ASSERT(0 != format);
+	FLAC__ASSERT(0 != name);
+
+	buffer[sizeof(buffer)-1] = '\0';
+	/*
+	 * We need to save the old locale and switch to "C" because the locale
+	 * influences the formatting of %f and we want it a certain way.
+	 */
+	saved_locale = strdup(setlocale(LC_ALL, 0));
+	if (0 == saved_locale)
+		return false;
+	setlocale(LC_ALL, "C");
+	flac_snprintf(buffer, sizeof(buffer), format, name, value);
+	setlocale(LC_ALL, saved_locale);
+	free(saved_locale);
+
+	entry.entry = (FLAC__byte *)buffer;
+	entry.length = strlen(buffer);
+
+	return FLAC__metadata_object_vorbiscomment_append_comment(block, entry, /*copy=*/true);
+}
+
+FLAC__bool grabbag__replaygain_is_valid_sample_frequency(uint32_t sample_frequency)
+{
+	return ValidGainFrequency( sample_frequency );
+}
+
+FLAC__bool grabbag__replaygain_init(uint32_t sample_frequency)
+{
+	title_peak_ = album_peak_ = 0.0;
+	return InitGainAnalysis((long)sample_frequency) == INIT_GAIN_ANALYSIS_OK;
+}
+
+FLAC__bool grabbag__replaygain_analyze(const FLAC__int32 * const input[], FLAC__bool is_stereo, uint32_t bps, uint32_t samples)
+{
+	/* using a small buffer improves data locality; we'd like it to fit easily in the dcache */
+	static flac_float_t lbuffer[2048], rbuffer[2048];
+	static const uint32_t nbuffer = sizeof(lbuffer) / sizeof(lbuffer[0]);
+	FLAC__int32 block_peak = 0, s;
+	uint32_t i, j;
+
+	FLAC__ASSERT(bps >= FLAC__MIN_BITS_PER_SAMPLE && bps <= FLAC__MAX_BITS_PER_SAMPLE);
+	FLAC__ASSERT(FLAC__MIN_BITS_PER_SAMPLE == 4 && FLAC__MAX_BITS_PER_SAMPLE == 32);
+
+	if(bps == 16) {
+		if(is_stereo) {
+			j = 0;
+			while(samples > 0) {
+				const uint32_t n = local_min(samples, nbuffer);
+				for(i = 0; i < n; i++, j++) {
+					s = input[0][j];
+					lbuffer[i] = (flac_float_t)s;
+					s = abs(s);
+					block_peak = local_max(block_peak, s);
+
+					s = input[1][j];
+					rbuffer[i] = (flac_float_t)s;
+					s = abs(s);
+					block_peak = local_max(block_peak, s);
+				}
+				samples -= n;
+				if(AnalyzeSamples(lbuffer, rbuffer, n, 2) != GAIN_ANALYSIS_OK)
+					return false;
+			}
+		}
+		else {
+			j = 0;
+			while(samples > 0) {
+				const uint32_t n = local_min(samples, nbuffer);
+				for(i = 0; i < n; i++, j++) {
+					s = input[0][j];
+					lbuffer[i] = (flac_float_t)s;
+					s = abs(s);
+					block_peak = local_max(block_peak, s);
+				}
+				samples -= n;
+				if(AnalyzeSamples(lbuffer, 0, n, 1) != GAIN_ANALYSIS_OK)
+					return false;
+			}
+		}
+	}
+	else {
+		const double scale = (
+			(bps > 16)?
+				(double)1. / (double)(1u << (bps - 16)) :
+				(double)(1u << (16 - bps))
+		);
+
+		if(is_stereo) {
+			j = 0;
+			while(samples > 0) {
+				const uint32_t n = local_min(samples, nbuffer);
+				for(i = 0; i < n; i++, j++) {
+					s = input[0][j];
+					lbuffer[i] = (flac_float_t)(scale * (double)s);
+					s = abs32(s);
+					block_peak = local_max(block_peak, s);
+
+					s = input[1][j];
+					rbuffer[i] = (flac_float_t)(scale * (double)s);
+					s = abs32(s);
+					block_peak = local_max(block_peak, s);
+				}
+				samples -= n;
+				if(AnalyzeSamples(lbuffer, rbuffer, n, 2) != GAIN_ANALYSIS_OK)
+					return false;
+			}
+		}
+		else {
+			j = 0;
+			while(samples > 0) {
+				const uint32_t n = local_min(samples, nbuffer);
+				for(i = 0; i < n; i++, j++) {
+					s = input[0][j];
+					lbuffer[i] = (flac_float_t)(scale * (double)s);
+					s = abs32(s);
+					block_peak = local_max(block_peak, s);
+				}
+				samples -= n;
+				if(AnalyzeSamples(lbuffer, 0, n, 1) != GAIN_ANALYSIS_OK)
+					return false;
+			}
+		}
+	}
+
+	{
+		const double peak_scale = (double)(1u << (bps - 1));
+		double peak = (double)block_peak / peak_scale;
+		if(peak > title_peak_)
+			title_peak_ = peak;
+		if(peak > album_peak_)
+			album_peak_ = peak;
+	}
+
+	return true;
+}
+
+void grabbag__replaygain_get_album(float *gain, float *peak)
+{
+	*gain = (float)GetAlbumGain();
+	*peak = (float)album_peak_;
+	album_peak_ = 0.0;
+}
+
+void grabbag__replaygain_get_title(float *gain, float *peak)
+{
+	*gain = (float)GetTitleGain();
+	*peak = (float)title_peak_;
+	title_peak_ = 0.0;
+}
+
+
+typedef struct {
+	uint32_t channels;
+	uint32_t bits_per_sample;
+	uint32_t sample_rate;
+	FLAC__bool error;
+} DecoderInstance;
+
+static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
+{
+	DecoderInstance *instance = (DecoderInstance*)client_data;
+	const uint32_t bits_per_sample = frame->header.bits_per_sample;
+	const uint32_t channels = frame->header.channels;
+	const uint32_t sample_rate = frame->header.sample_rate;
+	const uint32_t samples = frame->header.blocksize;
+
+	(void)decoder;
+
+	if(
+		!instance->error &&
+		(channels == 2 || channels == 1) &&
+		bits_per_sample == instance->bits_per_sample &&
+		channels == instance->channels &&
+		sample_rate == instance->sample_rate
+	) {
+		instance->error = !grabbag__replaygain_analyze(buffer, channels==2, bits_per_sample, samples);
+	}
+	else {
+		instance->error = true;
+	}
+
+	if(!instance->error)
+		return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
+	else
+		return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
+}
+
+static void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
+{
+	DecoderInstance *instance = (DecoderInstance*)client_data;
+
+	(void)decoder;
+
+	if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
+		instance->bits_per_sample = metadata->data.stream_info.bits_per_sample;
+		instance->channels = metadata->data.stream_info.channels;
+		instance->sample_rate = metadata->data.stream_info.sample_rate;
+
+		if(instance->channels != 1 && instance->channels != 2) {
+			instance->error = true;
+			return;
+		}
+
+		if(!grabbag__replaygain_is_valid_sample_frequency(instance->sample_rate)) {
+			instance->error = true;
+			return;
+		}
+	}
+}
+
+static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
+{
+	DecoderInstance *instance = (DecoderInstance*)client_data;
+
+	(void)decoder, (void)status;
+
+	instance->error = true;
+}
+
+const char *grabbag__replaygain_analyze_file(const char *filename, float *title_gain, float *title_peak)
+{
+	DecoderInstance instance;
+	FLAC__StreamDecoder *decoder = FLAC__stream_decoder_new();
+
+	if(0 == decoder)
+		return "memory allocation error";
+
+	instance.error = false;
+
+	/* It does these three by default but lets be explicit: */
+	FLAC__stream_decoder_set_md5_checking(decoder, false);
+	FLAC__stream_decoder_set_metadata_ignore_all(decoder);
+	FLAC__stream_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_STREAMINFO);
+
+	if(FLAC__stream_decoder_init_file(decoder, filename, write_callback_, metadata_callback_, error_callback_, &instance) != FLAC__STREAM_DECODER_INIT_STATUS_OK) {
+		FLAC__stream_decoder_delete(decoder);
+		return "initializing decoder";
+	}
+
+	if(!FLAC__stream_decoder_process_until_end_of_stream(decoder) || instance.error) {
+		FLAC__stream_decoder_delete(decoder);
+		return "decoding file";
+	}
+
+	FLAC__stream_decoder_delete(decoder);
+
+	grabbag__replaygain_get_title(title_gain, title_peak);
+
+	return 0;
+}
+
+const char *grabbag__replaygain_store_to_vorbiscomment(FLAC__StreamMetadata *block, float album_gain, float album_peak, float title_gain, float title_peak)
+{
+	const char *error;
+
+	if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_reference(block)))
+		return error;
+
+	if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_title(block, title_gain, title_peak)))
+		return error;
+
+	if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_album(block, album_gain, album_peak)))
+		return error;
+
+	return 0;
+}
+
+const char *grabbag__replaygain_store_to_vorbiscomment_reference(FLAC__StreamMetadata *block)
+{
+	FLAC__ASSERT(0 != block);
+	FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
+
+	if(FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_REFERENCE_LOUDNESS) < 0)
+		return "memory allocation error";
+
+	if(!append_tag_(block, reference_format_, GRABBAG__REPLAYGAIN_TAG_REFERENCE_LOUDNESS, ReplayGainReferenceLoudness))
+		return "memory allocation error";
+
+	return 0;
+}
+
+const char *grabbag__replaygain_store_to_vorbiscomment_album(FLAC__StreamMetadata *block, float album_gain, float album_peak)
+{
+	FLAC__ASSERT(0 != block);
+	FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
+
+	if(
+		FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_ALBUM_GAIN) < 0 ||
+		FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_ALBUM_PEAK) < 0
+	)
+		return "memory allocation error";
+
+	if(
+		!append_tag_(block, gain_format_, GRABBAG__REPLAYGAIN_TAG_ALBUM_GAIN, album_gain) ||
+		!append_tag_(block, peak_format_, GRABBAG__REPLAYGAIN_TAG_ALBUM_PEAK, album_peak)
+	)
+		return "memory allocation error";
+
+	return 0;
+}
+
+const char *grabbag__replaygain_store_to_vorbiscomment_title(FLAC__StreamMetadata *block, float title_gain, float title_peak)
+{
+	FLAC__ASSERT(0 != block);
+	FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
+
+	if(
+		FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_TITLE_GAIN) < 0 ||
+		FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_TITLE_PEAK) < 0
+	)
+		return "memory allocation error";
+
+	if(
+		!append_tag_(block, gain_format_, GRABBAG__REPLAYGAIN_TAG_TITLE_GAIN, title_gain) ||
+		!append_tag_(block, peak_format_, GRABBAG__REPLAYGAIN_TAG_TITLE_PEAK, title_peak)
+	)
+		return "memory allocation error";
+
+	return 0;
+}
+
+static const char *store_to_file_pre_(const char *filename, FLAC__Metadata_Chain **chain, FLAC__StreamMetadata **block)
+{
+	FLAC__Metadata_Iterator *iterator;
+	const char *error;
+	FLAC__bool found_vc_block = false;
+
+	if(0 == (*chain = FLAC__metadata_chain_new()))
+		return "memory allocation error";
+
+	if(!FLAC__metadata_chain_read(*chain, filename)) {
+		error = FLAC__Metadata_ChainStatusString[FLAC__metadata_chain_status(*chain)];
+		FLAC__metadata_chain_delete(*chain);
+		return error;
+	}
+
+	if(0 == (iterator = FLAC__metadata_iterator_new())) {
+		FLAC__metadata_chain_delete(*chain);
+		return "memory allocation error";
+	}
+
+	FLAC__metadata_iterator_init(iterator, *chain);
+
+	do {
+		*block = FLAC__metadata_iterator_get_block(iterator);
+		if((*block)->type == FLAC__METADATA_TYPE_VORBIS_COMMENT)
+			found_vc_block = true;
+	} while(!found_vc_block && FLAC__metadata_iterator_next(iterator));
+
+	if(!found_vc_block) {
+		/* create a new block */
+		*block = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT);
+		if(0 == *block) {
+			FLAC__metadata_chain_delete(*chain);
+			FLAC__metadata_iterator_delete(iterator);
+			return "memory allocation error";
+		}
+		while(FLAC__metadata_iterator_next(iterator))
+			;
+		if(!FLAC__metadata_iterator_insert_block_after(iterator, *block)) {
+			error = FLAC__Metadata_ChainStatusString[FLAC__metadata_chain_status(*chain)];
+			FLAC__metadata_chain_delete(*chain);
+			FLAC__metadata_iterator_delete(iterator);
+			return error;
+		}
+		/* iterator is left pointing to new block */
+		FLAC__ASSERT(FLAC__metadata_iterator_get_block(iterator) == *block);
+	}
+
+	FLAC__metadata_iterator_delete(iterator);
+
+	FLAC__ASSERT(0 != *block);
+	FLAC__ASSERT((*block)->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
+
+	return 0;
+}
+
+static const char *store_to_file_post_(const char *filename, FLAC__Metadata_Chain *chain, FLAC__bool preserve_modtime)
+{
+	struct flac_stat_s stats;
+	const FLAC__bool have_stats = get_file_stats_(filename, &stats);
+
+	(void)grabbag__file_change_stats(filename, /*read_only=*/false);
+
+	FLAC__metadata_chain_sort_padding(chain);
+	if(!FLAC__metadata_chain_write(chain, /*use_padding=*/true, preserve_modtime)) {
+		const char *error;
+		error = FLAC__Metadata_ChainStatusString[FLAC__metadata_chain_status(chain)];
+		FLAC__metadata_chain_delete(chain);
+		return error;
+	}
+
+	FLAC__metadata_chain_delete(chain);
+
+	if(have_stats)
+		set_file_stats_(filename, &stats);
+
+	return 0;
+}
+
+const char *grabbag__replaygain_store_to_file(const char *filename, float album_gain, float album_peak, float title_gain, float title_peak, FLAC__bool preserve_modtime)
+{
+	FLAC__Metadata_Chain *chain;
+	FLAC__StreamMetadata *block = NULL;
+	const char *error;
+
+	if(0 != (error = store_to_file_pre_(filename, &chain, &block)))
+		return error;
+
+	if(0 != (error = grabbag__replaygain_store_to_vorbiscomment(block, album_gain, album_peak, title_gain, title_peak))) {
+		FLAC__metadata_chain_delete(chain);
+		return error;
+	}
+
+	if(0 != (error = store_to_file_post_(filename, chain, preserve_modtime)))
+		return error;
+
+	return 0;
+}
+
+const char *grabbag__replaygain_store_to_file_reference(const char *filename, FLAC__bool preserve_modtime)
+{
+	FLAC__Metadata_Chain *chain;
+	FLAC__StreamMetadata *block = NULL;
+	const char *error;
+
+	if(0 != (error = store_to_file_pre_(filename, &chain, &block)))
+		return error;
+
+	if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_reference(block))) {
+		FLAC__metadata_chain_delete(chain);
+		return error;
+	}
+
+	if(0 != (error = store_to_file_post_(filename, chain, preserve_modtime)))
+		return error;
+
+	return 0;
+}
+
+const char *grabbag__replaygain_store_to_file_album(const char *filename, float album_gain, float album_peak, FLAC__bool preserve_modtime)
+{
+	FLAC__Metadata_Chain *chain;
+	FLAC__StreamMetadata *block = NULL;
+	const char *error;
+
+	if(0 != (error = store_to_file_pre_(filename, &chain, &block)))
+		return error;
+
+	if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_album(block, album_gain, album_peak))) {
+		FLAC__metadata_chain_delete(chain);
+		return error;
+	}
+
+	if(0 != (error = store_to_file_post_(filename, chain, preserve_modtime)))
+		return error;
+
+	return 0;
+}
+
+const char *grabbag__replaygain_store_to_file_title(const char *filename, float title_gain, float title_peak, FLAC__bool preserve_modtime)
+{
+	FLAC__Metadata_Chain *chain;
+	FLAC__StreamMetadata *block = NULL;
+	const char *error;
+
+	if(0 != (error = store_to_file_pre_(filename, &chain, &block)))
+		return error;
+
+	if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_title(block, title_gain, title_peak))) {
+		FLAC__metadata_chain_delete(chain);
+		return error;
+	}
+
+	if(0 != (error = store_to_file_post_(filename, chain, preserve_modtime)))
+		return error;
+
+	return 0;
+}
+
+static FLAC__bool parse_double_(const FLAC__StreamMetadata_VorbisComment_Entry *entry, double *val)
+{
+	char s[32], *end;
+	const char *p, *q;
+	double v;
+
+	FLAC__ASSERT(0 != entry);
+	FLAC__ASSERT(0 != val);
+
+	p = (const char *)entry->entry;
+	q = strchr(p, '=');
+	if(0 == q)
+		return false;
+	q++;
+	safe_strncpy(s, q, local_min(sizeof(s), (size_t) (entry->length - (q-p))));
+
+	v = strtod(s, &end);
+	if(end == s)
+		return false;
+
+	*val = v;
+	return true;
+}
+
+FLAC__bool grabbag__replaygain_load_from_vorbiscomment(const FLAC__StreamMetadata *block, FLAC__bool album_mode, FLAC__bool strict, double *reference, double *gain, double *peak)
+{
+	int reference_offset, gain_offset, peak_offset;
+	char *saved_locale;
+	FLAC__bool res = true;
+
+	FLAC__ASSERT(0 != block);
+	FLAC__ASSERT(0 != reference);
+	FLAC__ASSERT(0 != gain);
+	FLAC__ASSERT(0 != peak);
+	FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
+
+	/* Default to current level until overridden by a detected tag; this
+	 * will always be true until we change replaygain_analysis.c
+	 */
+	*reference = ReplayGainReferenceLoudness;
+
+	/*
+	 * We need to save the old locale and switch to "C" because the locale
+	 * influences the behaviour of strtod and we want it a certain way.
+	 */
+	saved_locale = strdup(setlocale(LC_ALL, 0));
+	if (0 == saved_locale)
+		return false;
+	setlocale(LC_ALL, "C");
+
+	if(0 <= (reference_offset = FLAC__metadata_object_vorbiscomment_find_entry_from(block, /*offset=*/0, (const char *)GRABBAG__REPLAYGAIN_TAG_REFERENCE_LOUDNESS)))
+		(void)parse_double_(block->data.vorbis_comment.comments + reference_offset, reference);
+
+	if(0 > (gain_offset = FLAC__metadata_object_vorbiscomment_find_entry_from(block, /*offset=*/0, (const char *)(album_mode? GRABBAG__REPLAYGAIN_TAG_ALBUM_GAIN : GRABBAG__REPLAYGAIN_TAG_TITLE_GAIN))))
+		res = false;
+	if(0 > (peak_offset = FLAC__metadata_object_vorbiscomment_find_entry_from(block, /*offset=*/0, (const char *)(album_mode? GRABBAG__REPLAYGAIN_TAG_ALBUM_PEAK : GRABBAG__REPLAYGAIN_TAG_TITLE_PEAK))))
+		res = false;
+
+	if(res && !parse_double_(block->data.vorbis_comment.comments + gain_offset, gain))
+		res = false;
+	if(res && !parse_double_(block->data.vorbis_comment.comments + peak_offset, peak))
+		res = false;
+	if(res && *peak < 0.0)
+		res = false;
+
+	setlocale(LC_ALL, saved_locale);
+	free(saved_locale);
+
+	/* something failed; retry with strict */
+	if (!res && !strict)
+		res = grabbag__replaygain_load_from_vorbiscomment(block, !album_mode, /*strict=*/true, reference, gain, peak);
+
+	return res;
+}
+
+double grabbag__replaygain_compute_scale_factor(double peak, double gain, double preamp, FLAC__bool prevent_clipping)
+{
+	double scale;
+	FLAC__ASSERT(peak >= 0.0);
+ 	gain += preamp;
+	scale = (float) pow(10.0, gain * 0.05);
+	if(prevent_clipping && peak > 0.0) {
+		const double max_scale = (float)(1.0 / peak);
+		if(scale > max_scale)
+			scale = max_scale;
+	}
+	return scale;
+}
diff --git a/src/share/grabbag/seektable.c b/src/share/grabbag/seektable.c
new file mode 100644
index 0000000..01caa99
--- /dev/null
+++ b/src/share/grabbag/seektable.c
@@ -0,0 +1,105 @@
+/* grabbag - Convenience lib for various routines common to several tools
+ * Copyright (C) 2002-2009  Josh Coalson
+ * Copyright (C) 2011-2023  Xiph.Org Foundation
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include "share/grabbag.h"
+#include "share/compat.h"
+#include "FLAC/assert.h"
+#include <stdlib.h> /* for atoi() */
+#include <string.h>
+
+FLAC__bool grabbag__seektable_convert_specification_to_template(const char *spec, FLAC__bool only_explicit_placeholders, FLAC__uint64 total_samples_to_encode, uint32_t sample_rate, FLAC__StreamMetadata *seektable_template, FLAC__bool *spec_has_real_points)
+{
+	uint32_t i;
+	const char *pt;
+
+	FLAC__ASSERT(0 != spec);
+	FLAC__ASSERT(0 != seektable_template);
+	FLAC__ASSERT(seektable_template->type == FLAC__METADATA_TYPE_SEEKTABLE);
+
+	if(0 != spec_has_real_points)
+		*spec_has_real_points = false;
+
+	for(pt = spec, i = 0; pt && *pt; i++) {
+		const char *q = strchr(pt, ';');
+		FLAC__ASSERT(0 != q);
+
+		if(q > pt) {
+			if(0 == strncmp(pt, "X;", 2)) { /* -S X */
+				if(!FLAC__metadata_object_seektable_template_append_placeholders(seektable_template, 1))
+					return false;
+			}
+			else if(q[-1] == 'x') { /* -S #x */
+				if(total_samples_to_encode > 0) { /* we can only do these if we know the number of samples to encode up front */
+					if(0 != spec_has_real_points)
+						*spec_has_real_points = true;
+					if(!only_explicit_placeholders) {
+						const int n = (uint32_t)atoi(pt);
+						if(n > 0)
+							if(!FLAC__metadata_object_seektable_template_append_spaced_points(seektable_template, (uint32_t)n, total_samples_to_encode))
+								return false;
+					}
+				}
+			}
+			else if(q[-1] == 's') { /* -S #s */
+				if(total_samples_to_encode > 0 && sample_rate > 0) { /* we can only do these if we know the number of samples and sample rate to encode up front */
+					if(0 != spec_has_real_points)
+						*spec_has_real_points = true;
+					if(!only_explicit_placeholders) {
+						const double sec = atof(pt);
+						if(sec > 0.0) {
+							uint32_t samples = (uint32_t)(sec * (double)sample_rate);
+							/* Restrict seekpoints to two per second of audio. */
+							samples = samples < sample_rate / 2 ? sample_rate / 2 : samples;
+							if(samples > 0) {
+								/* +1 for the initial point at sample 0 */
+								if(!FLAC__metadata_object_seektable_template_append_spaced_points_by_samples(seektable_template, samples, total_samples_to_encode))
+									return false;
+							}
+						}
+					}
+				}
+			}
+			else { /* -S # */
+				if(0 != spec_has_real_points)
+					*spec_has_real_points = true;
+				if(!only_explicit_placeholders) {
+					char *endptr;
+					const FLAC__int64 n = (FLAC__int64)strtoll(pt, &endptr, 10);
+					if(
+						(n > 0 || (endptr > pt && *endptr == ';')) && /* is a valid number (extra check needed for "0") */
+						(total_samples_to_encode == 0 || (FLAC__uint64)n < total_samples_to_encode) /* number is not >= the known total_samples_to_encode */
+					)
+						if(!FLAC__metadata_object_seektable_template_append_point(seektable_template, (FLAC__uint64)n))
+							return false;
+				}
+			}
+		}
+
+		pt = ++q;
+	}
+
+	if(!FLAC__metadata_object_seektable_template_sort(seektable_template, /*compact=*/true))
+		return false;
+
+	return true;
+}
diff --git a/src/share/grabbag/snprintf.c b/src/share/grabbag/snprintf.c
new file mode 100644
index 0000000..bd7ffba
--- /dev/null
+++ b/src/share/grabbag/snprintf.c
@@ -0,0 +1,101 @@
+/* grabbag - Convenience lib for various routines common to several tools
+ * Copyright (C) 2013-2023  Xiph.Org Foundation
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of the Xiph.org Foundation nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "share/compat.h"
+
+/*
+ * FLAC needs to compile and work correctly on systems with a normal ISO C99
+ * snprintf as well as Microsoft Visual Studio which has an non-standards
+ * conformant snprint_s function.
+ *
+ * The important difference occurs when the resultant string (plus string
+ * terminator) would have been longer than the supplied size parameter. When
+ * this happens, ISO C's snprintf returns the length of resultant string, but
+ * does not over-write the end of the buffer. MS's snprintf_s in this case
+ * returns -1.
+ *
+ * The _MSC_VER code below attempts to modify the return code for vsnprintf_s
+ * to something that is more compatible with the behaviour of the ISO C version.
+ */
+
+int
+flac_snprintf(char *str, size_t size, const char *fmt, ...)
+{
+	va_list va;
+	int rc;
+
+#if defined _MSC_VER
+	if (size == 0)
+		return 1024;
+#endif
+
+	va_start (va, fmt);
+
+#if defined _MSC_VER
+	rc = vsnprintf_s (str, size, _TRUNCATE, fmt, va);
+	if (rc < 0)
+		rc = size - 1;
+#elif defined __MINGW32__
+	rc = __mingw_vsnprintf (str, size, fmt, va);
+#else
+	rc = vsnprintf (str, size, fmt, va);
+#endif
+	va_end (va);
+
+	return rc;
+}
+
+int
+flac_vsnprintf(char *str, size_t size, const char *fmt, va_list va)
+{
+	int rc;
+
+#if defined _MSC_VER
+	if (size == 0)
+		return 1024;
+	rc = vsnprintf_s (str, size, _TRUNCATE, fmt, va);
+	if (rc < 0)
+		rc = size - 1;
+#elif defined __MINGW32__
+	rc = __mingw_vsnprintf (str, size, fmt, va);
+#else
+	rc = vsnprintf (str, size, fmt, va);
+#endif
+
+	return rc;
+}