/* libFLAC - Free Lossless Audio Codec library * Copyright (C) 2000-2009  Josh Coalson * Copyright (C) 2011-2016  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. */ #include <stdio.h>#include <stdlib.h> /* for qsort() */#include <string.h> /* for memset() */#include "FLAC/format.h"#include "share/alloc.h"#include "share/compat.h"#include "private/format.h"#include "private/macros.h" /* PACKAGE_VERSION should come from configure */FLAC_API const char *FLAC__VERSION_STRING = "1.3.3"; FLAC_API const char *FLAC__VENDOR_STRING = "reference libFLAC " "1.3.3" " 20190804"; FLAC_API const FLAC__byte FLAC__STREAM_SYNC_STRING[4] = { 'f','L','a','C' };FLAC_API const uint32_t FLAC__STREAM_SYNC = 0x664C6143;FLAC_API const uint32_t FLAC__STREAM_SYNC_LEN = 32; /* bits */ FLAC_API const uint32_t FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN = 16; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN = 16; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN = 24; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN = 24; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN = 20; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN = 3; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN = 5; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN = 36; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_STREAMINFO_MD5SUM_LEN = 128; /* bits */ FLAC_API const uint32_t FLAC__STREAM_METADATA_APPLICATION_ID_LEN = 32; /* bits */ FLAC_API const uint32_t FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN = 64; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN = 64; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN = 16; /* bits */ FLAC_API const FLAC__uint64 FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER = FLAC__U64L(0xffffffffffffffff); FLAC_API const uint32_t FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN = 32; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN = 32; /* bits */ FLAC_API const uint32_t FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN = 64; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN = 8; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN = 3*8; /* bits */ FLAC_API const uint32_t FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN = 64; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN = 8; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN = 12*8; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN = 1; /* bit */FLAC_API const uint32_t FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN = 1; /* bit */FLAC_API const uint32_t FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN = 6+13*8; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN = 8; /* bits */ FLAC_API const uint32_t FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN = 128*8; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN = 64; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN = 1; /* bit */FLAC_API const uint32_t FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN = 7+258*8; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN = 8; /* bits */ FLAC_API const uint32_t FLAC__STREAM_METADATA_PICTURE_TYPE_LEN = 32; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN = 32; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN = 32; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN = 32; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN = 32; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN = 32; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_PICTURE_COLORS_LEN = 32; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN = 32; /* bits */ FLAC_API const uint32_t FLAC__STREAM_METADATA_IS_LAST_LEN = 1; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_TYPE_LEN = 7; /* bits */FLAC_API const uint32_t FLAC__STREAM_METADATA_LENGTH_LEN = 24; /* bits */ FLAC_API const uint32_t FLAC__FRAME_HEADER_SYNC = 0x3ffe;FLAC_API const uint32_t FLAC__FRAME_HEADER_SYNC_LEN = 14; /* bits */FLAC_API const uint32_t FLAC__FRAME_HEADER_RESERVED_LEN = 1; /* bits */FLAC_API const uint32_t FLAC__FRAME_HEADER_BLOCKING_STRATEGY_LEN = 1; /* bits */FLAC_API const uint32_t FLAC__FRAME_HEADER_BLOCK_SIZE_LEN = 4; /* bits */FLAC_API const uint32_t FLAC__FRAME_HEADER_SAMPLE_RATE_LEN = 4; /* bits */FLAC_API const uint32_t FLAC__FRAME_HEADER_CHANNEL_ASSIGNMENT_LEN = 4; /* bits */FLAC_API const uint32_t FLAC__FRAME_HEADER_BITS_PER_SAMPLE_LEN = 3; /* bits */FLAC_API const uint32_t FLAC__FRAME_HEADER_ZERO_PAD_LEN = 1; /* bits */FLAC_API const uint32_t FLAC__FRAME_HEADER_CRC_LEN = 8; /* bits */ FLAC_API const uint32_t FLAC__FRAME_FOOTER_CRC_LEN = 16; /* bits */ FLAC_API const uint32_t FLAC__ENTROPY_CODING_METHOD_TYPE_LEN = 2; /* bits */FLAC_API const uint32_t FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN = 4; /* bits */FLAC_API const uint32_t FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN = 4; /* bits */FLAC_API const uint32_t FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN = 5; /* bits */FLAC_API const uint32_t FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN = 5; /* bits */ FLAC_API const uint32_t FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER = 15; /* == (1<<FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN)-1 */FLAC_API const uint32_t FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_ESCAPE_PARAMETER = 31; /* == (1<<FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN)-1 */ FLAC_API const char * const FLAC__EntropyCodingMethodTypeString[] = {	"PARTITIONED_RICE",	"PARTITIONED_RICE2"}; FLAC_API const uint32_t FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN = 4; /* bits */FLAC_API const uint32_t FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN = 5; /* bits */ FLAC_API const uint32_t FLAC__SUBFRAME_ZERO_PAD_LEN = 1; /* bits */FLAC_API const uint32_t FLAC__SUBFRAME_TYPE_LEN = 6; /* bits */FLAC_API const uint32_t FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN = 1; /* bits */ FLAC_API const uint32_t FLAC__SUBFRAME_TYPE_CONSTANT_BYTE_ALIGNED_MASK = 0x00;FLAC_API const uint32_t FLAC__SUBFRAME_TYPE_VERBATIM_BYTE_ALIGNED_MASK = 0x02;FLAC_API const uint32_t FLAC__SUBFRAME_TYPE_FIXED_BYTE_ALIGNED_MASK = 0x10;FLAC_API const uint32_t FLAC__SUBFRAME_TYPE_LPC_BYTE_ALIGNED_MASK = 0x40; FLAC_API const char * const FLAC__SubframeTypeString[] = {	"CONSTANT",	"VERBATIM",	"FIXED",	"LPC"}; FLAC_API const char * const FLAC__ChannelAssignmentString[] = {	"INDEPENDENT",	"LEFT_SIDE",	"RIGHT_SIDE",	"MID_SIDE"}; FLAC_API const char * const FLAC__FrameNumberTypeString[] = {	"FRAME_NUMBER_TYPE_FRAME_NUMBER",	"FRAME_NUMBER_TYPE_SAMPLE_NUMBER"}; FLAC_API const char * const FLAC__MetadataTypeString[] = {	"STREAMINFO",	"PADDING",	"APPLICATION",	"SEEKTABLE",	"VORBIS_COMMENT",	"CUESHEET",	"PICTURE"}; FLAC_API const char * const FLAC__StreamMetadata_Picture_TypeString[] = {	"Other",	"32x32 pixels 'file icon' (PNG only)",	"Other file icon",	"Cover (front)",	"Cover (back)",	"Leaflet page",	"Media (e.g. label side of CD)",	"Lead artist/lead performer/soloist",	"Artist/performer",	"Conductor",	"Band/Orchestra",	"Composer",	"Lyricist/text writer",	"Recording Location",	"During recording",	"During performance",	"Movie/video screen capture",	"A bright coloured fish",	"Illustration",	"Band/artist logotype",	"Publisher/Studio logotype"}; FLAC_API FLAC__bool FLAC__format_sample_rate_is_valid(uint32_t sample_rate){	if(sample_rate == 0 || sample_rate > FLAC__MAX_SAMPLE_RATE) {		return false;	}	else		return true;} FLAC_API FLAC__bool FLAC__format_blocksize_is_subset(uint32_t blocksize, uint32_t sample_rate){	if(blocksize > 16384)		return false;	else if(sample_rate <= 48000 && blocksize > 4608)		return false;	else		return true;} FLAC_API FLAC__bool FLAC__format_sample_rate_is_subset(uint32_t sample_rate){	if(		!FLAC__format_sample_rate_is_valid(sample_rate) ||		(			sample_rate >= (1u << 16) &&			!(sample_rate % 1000 == 0 || sample_rate % 10 == 0)		)	) {		return false;	}	else		return true;} /* @@@@ add to unit tests; it is already indirectly tested by the metadata_object tests */FLAC_API FLAC__bool FLAC__format_seektable_is_legal(const FLAC__StreamMetadata_SeekTable *seek_table){	uint32_t i;	FLAC__uint64 prev_sample_number = 0;	FLAC__bool got_prev = false; 	for(i = 0; i < seek_table->num_points; i++) {		if(got_prev) {			if(				seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&				seek_table->points[i].sample_number <= prev_sample_number			)				return false;		}		prev_sample_number = seek_table->points[i].sample_number;		got_prev = true;	} 	return true;} /* used as the sort predicate for qsort() */static int seekpoint_compare_(const FLAC__StreamMetadata_SeekPoint *l, const FLAC__StreamMetadata_SeekPoint *r){	/* we don't just 'return l->sample_number - r->sample_number' since the result (FLAC__int64) might overflow an 'int' */	if(l->sample_number == r->sample_number)		return 0;	else if(l->sample_number < r->sample_number)		return -1;	else		return 1;} /* @@@@ add to unit tests; it is already indirectly tested by the metadata_object tests */FLAC_API uint32_t FLAC__format_seektable_sort(FLAC__StreamMetadata_SeekTable *seek_table){	uint32_t i, j;	FLAC__bool first; 	if (seek_table->num_points == 0)		return 0; 	/* sort the seekpoints */	qsort(seek_table->points, seek_table->num_points, sizeof(FLAC__StreamMetadata_SeekPoint), (int (*)(const void *, const void *))seekpoint_compare_); 	/* uniquify the seekpoints */	first = true;	for(i = j = 0; i < seek_table->num_points; i++) {		if(seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER) {			if(!first) {				if(seek_table->points[i].sample_number == seek_table->points[j-1].sample_number)					continue;			}		}		first = false;		seek_table->points[j++] = seek_table->points[i];	} 	for(i = j; i < seek_table->num_points; i++) {		seek_table->points[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;		seek_table->points[i].stream_offset = 0;		seek_table->points[i].frame_samples = 0;	} 	return j;} /* * also disallows non-shortest-form encodings, c.f. *   http://www.unicode.org/versions/corrigendum1.html * and a more clear explanation at the end of this section: *   http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8 */static uint32_t utf8len_(const FLAC__byte *utf8){	if ((utf8[0] & 0x80) == 0) {		return 1;	}	else if ((utf8[0] & 0xE0) == 0xC0 && (utf8[1] & 0xC0) == 0x80) {		if ((utf8[0] & 0xFE) == 0xC0) /* overlong sequence check */			return 0;		return 2;	}	else if ((utf8[0] & 0xF0) == 0xE0 && (utf8[1] & 0xC0) == 0x80 && (utf8[2] & 0xC0) == 0x80) {		if (utf8[0] == 0xE0 && (utf8[1] & 0xE0) == 0x80) /* overlong sequence check */			return 0;		/* illegal surrogates check (U+D800...U+DFFF and U+FFFE...U+FFFF) */		if (utf8[0] == 0xED && (utf8[1] & 0xE0) == 0xA0) /* D800-DFFF */			return 0;		if (utf8[0] == 0xEF && utf8[1] == 0xBF && (utf8[2] & 0xFE) == 0xBE) /* FFFE-FFFF */			return 0;		return 3;	}	else if ((utf8[0] & 0xF8) == 0xF0 && (utf8[1] & 0xC0) == 0x80 && (utf8[2] & 0xC0) == 0x80 && (utf8[3] & 0xC0) == 0x80) {		if (utf8[0] == 0xF0 && (utf8[1] & 0xF0) == 0x80) /* overlong sequence check */			return 0;		return 4;	}	else if ((utf8[0] & 0xFC) == 0xF8 && (utf8[1] & 0xC0) == 0x80 && (utf8[2] & 0xC0) == 0x80 && (utf8[3] & 0xC0) == 0x80 && (utf8[4] & 0xC0) == 0x80) {		if (utf8[0] == 0xF8 && (utf8[1] & 0xF8) == 0x80) /* overlong sequence check */			return 0;		return 5;	}	else if ((utf8[0] & 0xFE) == 0xFC && (utf8[1] & 0xC0) == 0x80 && (utf8[2] & 0xC0) == 0x80 && (utf8[3] & 0xC0) == 0x80 && (utf8[4] & 0xC0) == 0x80 && (utf8[5] & 0xC0) == 0x80) {		if (utf8[0] == 0xFC && (utf8[1] & 0xFC) == 0x80) /* overlong sequence check */			return 0;		return 6;	}	else {		return 0;	}} FLAC_API FLAC__bool FLAC__format_vorbiscomment_entry_name_is_legal(const char *name){	char c;	for(c = *name; c; c = *(++name))		if(c < 0x20 || c == 0x3d || c > 0x7d)			return false;	return true;} FLAC_API FLAC__bool FLAC__format_vorbiscomment_entry_value_is_legal(const FLAC__byte *value, uint32_t length){	if(length == (uint32_t)(-1)) {		while(*value) {			uint32_t n = utf8len_(value);			if(n == 0)				return false;			value += n;		}	}	else {		const FLAC__byte *end = value + length;		while(value < end) {			uint32_t n = utf8len_(value);			if(n == 0)				return false;			value += n;		}		if(value != end)			return false;	}	return true;} FLAC_API FLAC__bool FLAC__format_vorbiscomment_entry_is_legal(const FLAC__byte *entry, uint32_t length){	const FLAC__byte *s, *end; 	for(s = entry, end = s + length; s < end && *s != '='; s++) {		if(*s < 0x20 || *s > 0x7D)			return false;	}	if(s == end)		return false; 	s++; /* skip '=' */ 	while(s < end) {		uint32_t n = utf8len_(s);		if(n == 0)			return false;		s += n;	}	if(s != end)		return false; 	return true;} /* @@@@ add to unit tests; it is already indirectly tested by the metadata_object tests */FLAC_API FLAC__bool FLAC__format_cuesheet_is_legal(const FLAC__StreamMetadata_CueSheet *cue_sheet, FLAC__bool check_cd_da_subset, const char **violation){	uint32_t i, j; 	if(check_cd_da_subset) {		if(cue_sheet->lead_in < 2 * 44100) {			if(violation) *violation = "CD-DA cue sheet must have a lead-in length of at least 2 seconds";			return false;		}		if(cue_sheet->lead_in % 588 != 0) {			if(violation) *violation = "CD-DA cue sheet lead-in length must be evenly divisible by 588 samples";			return false;		}	} 	if(cue_sheet->num_tracks == 0) {		if(violation) *violation = "cue sheet must have at least one track (the lead-out)";		return false;	} 	if(check_cd_da_subset && cue_sheet->tracks[cue_sheet->num_tracks-1].number != 170) {		if(violation) *violation = "CD-DA cue sheet must have a lead-out track number 170 (0xAA)";		return false;	} 	for(i = 0; i < cue_sheet->num_tracks; i++) {		if(cue_sheet->tracks[i].number == 0) {			if(violation) *violation = "cue sheet may not have a track number 0";			return false;		} 		if(check_cd_da_subset) {			if(!((cue_sheet->tracks[i].number >= 1 && cue_sheet->tracks[i].number <= 99) || cue_sheet->tracks[i].number == 170)) {				if(violation) *violation = "CD-DA cue sheet track number must be 1-99 or 170";				return false;			}		} 		if(check_cd_da_subset && cue_sheet->tracks[i].offset % 588 != 0) {			if(violation) {				if(i == cue_sheet->num_tracks-1) /* the lead-out track... */					*violation = "CD-DA cue sheet lead-out offset must be evenly divisible by 588 samples";				else					*violation = "CD-DA cue sheet track offset must be evenly divisible by 588 samples";			}			return false;		} 		if(i < cue_sheet->num_tracks - 1) {			if(cue_sheet->tracks[i].num_indices == 0) {				if(violation) *violation = "cue sheet track must have at least one index point";				return false;			} 			if(cue_sheet->tracks[i].indices[0].number > 1) {				if(violation) *violation = "cue sheet track's first index number must be 0 or 1";				return false;			}		} 		for(j = 0; j < cue_sheet->tracks[i].num_indices; j++) {			if(check_cd_da_subset && cue_sheet->tracks[i].indices[j].offset % 588 != 0) {				if(violation) *violation = "CD-DA cue sheet track index offset must be evenly divisible by 588 samples";				return false;			} 			if(j > 0) {				if(cue_sheet->tracks[i].indices[j].number != cue_sheet->tracks[i].indices[j-1].number + 1) {					if(violation) *violation = "cue sheet track index numbers must increase by 1";					return false;				}			}		}	} 	return true;} /* @@@@ add to unit tests; it is already indirectly tested by the metadata_object tests */FLAC_API FLAC__bool FLAC__format_picture_is_legal(const FLAC__StreamMetadata_Picture *picture, const char **violation){	char *p;	FLAC__byte *b; 	for(p = picture->mime_type; *p; p++) {		if(*p < 0x20 || *p > 0x7e) {			if(violation) *violation = "MIME type string must contain only printable ASCII characters (0x20-0x7e)";			return false;		}	} 	for(b = picture->description; *b; ) {		uint32_t n = utf8len_(b);		if(n == 0) {			if(violation) *violation = "description string must be valid UTF-8";			return false;		}		b += n;	}

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