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/* metaflac - Command-line FLAC metadata editor
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* Copyright (C) 2001 Josh Coalson
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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* WATCHOUT - this is meant to be very lightweight an not even dependent
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* on libFLAC, so there are a couple places where FLAC__* variables are
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* duplicated here. Look for 'DUPLICATE:' in comments.
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static const char *sync_string_ = "fLaC"; /* DUPLICATE:FLAC__STREAM_SYNC_STRING */
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static const char *metadata_type_string_[] = { /* DUPLICATE:FLAC__MetaDataTypeString */
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static const unsigned SEEKPOINT_LEN_ = 18; /* DUPLICATE:FLAC__STREAM_METADATA_SEEKPOINT_LEN */
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static int usage(const char *message, ...);
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static FLAC__bool list(FILE *f, FLAC__bool verbose);
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static FLAC__uint32 unpack_uint32(FLAC__byte *b, unsigned bytes);
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static FLAC__uint64 unpack_uint64(FLAC__byte *b, unsigned bytes);
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static void hexdump(const FLAC__byte *buf, unsigned bytes, const char *indent);
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int main(int argc, char *argv[])
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int i, first_file, retval = 0;
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FLAC__bool verbose = false, list_mode = true;
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for(i = 1; i < argc; i++) {
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if(argv[i][0] != '-' || argv[i][1] == 0)
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if(0 == strcmp(argv[i], "-l"))
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else if(0 == strcmp(argv[i], "-v"))
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else if(0 == strcmp(argv[i], "-v-"))
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return usage("ERROR: invalid option '%s'\n", argv[i]);
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for(first_file = i; i < argc; i++) {
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FILE *f = fopen(argv[i], "r");
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fprintf(stderr, "ERROR opening %s\n", argv[i]);
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printf("%sfile: %s\n", i==first_file? "" : "\n", argv[i]);
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int usage(const char *message, ...)
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va_start(args, message);
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(void) vfprintf(stderr, message, args);
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printf("==============================================================================\n");
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printf("metaflac - Command-line FLAC metadata editor version %s\n", FLAC__VERSION_STRING);
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printf("Copyright (C) 2001 Josh Coalson\n");
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printf("This program is free software; you can redistribute it and/or\n");
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printf("modify it under the terms of the GNU General Public License\n");
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printf("as published by the Free Software Foundation; either version 2\n");
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printf("of the License, or (at your option) any later version.\n");
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printf("This program is distributed in the hope that it will be useful,\n");
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printf("but WITHOUT ANY WARRANTY; without even the implied warranty of\n");
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printf("MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n");
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printf("GNU General Public License for more details.\n");
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printf("You should have received a copy of the GNU General Public License\n");
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printf("along with this program; if not, write to the Free Software\n");
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printf("Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.\n");
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printf("==============================================================================\n");
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printf(" metaflac [options] flacfile [...]\n");
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printf("options:\n");
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printf(" -l : list metadata blocks\n");
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printf(" -v : verbose\n");
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return message? 1 : 0;
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FLAC__bool list(FILE *f, FLAC__bool verbose)
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FLAC__byte buf[65536];
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FLAC__StreamMetaData metadata;
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unsigned blocknum = 0, byte_offset = 0, i;
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/* skip any id3v2 tag */
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if(fread(buf, 1, 4, f) < 4) {
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fprintf(stderr, "ERROR: not a FLAC file\n");
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if(0 == memcmp(buf, "ID3", 3)) {
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unsigned tag_length = 0;
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/* skip to the tag length */
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if(fseek(f, 2, SEEK_CUR) < 0) {
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fprintf(stderr, "ERROR: bad ID3v2 tag\n");
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/* read the length */
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for(i = 0; i < 4; i++) {
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if(fread(buf, 1, 1, f) < 1 || buf[0] & 0x80) {
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fprintf(stderr, "ERROR: bad ID3v2 tag\n");
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tag_length |= (buf[0] & 0x7f);
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/* skip the rest of the tag */
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if(fseek(f, tag_length, SEEK_CUR) < 0) {
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fprintf(stderr, "ERROR: bad ID3v2 tag\n");
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/* read the stream sync code */
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if(fread(buf, 1, 4, f) < 4) {
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fprintf(stderr, "ERROR: not a FLAC file (no '%s' header)\n", sync_string_);
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/* check the stream sync code */
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if(memcmp(buf, sync_string_, 4)) {
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fprintf(stderr, "ERROR: not a FLAC file (no '%s' header)\n", sync_string_);
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/* read the metadata blocks */
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/* read the metadata block header */
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if(fread(buf, 1, 4, f) < 4) {
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fprintf(stderr, "ERROR: short count reading metadata block header\n");
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metadata.is_last = (buf[0] & 0x80)? true:false;
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metadata.type = (FLAC__MetaDataType)(buf[0] & 0x7f);
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metadata.length = unpack_uint32(buf+1, 3);
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printf("METADATA block #%u\n", blocknum);
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printf(" byte offset: %u\n", byte_offset);
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printf(" type: %u (%s)\n", (unsigned)metadata.type, metadata.type<=FLAC__METADATA_TYPE_SEEKTABLE? metadata_type_string_[metadata.type] : "UNKNOWN");
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printf(" is last: %s\n", metadata.is_last? "true":"false");
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printf(" length: %u\n", metadata.length);
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if(metadata.length > sizeof(buf)) {
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printf(" SKIPPING large block\n");
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if(fseek(f, metadata.length, SEEK_CUR) < 0) {
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fprintf(stderr, "ERROR: short count skipping metadata block data\n");
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/* read the metadata block data */
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if(fread(buf, 1, metadata.length, f) < metadata.length) {
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fprintf(stderr, "ERROR: short count reading metadata block data\n");
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switch(metadata.type) {
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case FLAC__METADATA_TYPE_STREAMINFO:
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metadata.data.stream_info.min_blocksize = unpack_uint32(b, 2); b += 2;
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metadata.data.stream_info.max_blocksize = unpack_uint32(b, 2); b += 2;
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metadata.data.stream_info.min_framesize = unpack_uint32(b, 3); b += 3;
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metadata.data.stream_info.max_framesize = unpack_uint32(b, 3); b += 3;
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metadata.data.stream_info.sample_rate = (unpack_uint32(b, 2) << 4) | ((unsigned)(b[2] & 0xf0) >> 4);
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metadata.data.stream_info.channels = (unsigned)((b[2] & 0x0e) >> 1) + 1;
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metadata.data.stream_info.bits_per_sample = ((((unsigned)(b[2] & 0x01)) << 1) | (((unsigned)(b[3] & 0xf0)) >> 4)) + 1;
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metadata.data.stream_info.total_samples = (((FLAC__uint64)(b[3] & 0x0f)) << 32) | unpack_uint64(b+4, 4);
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memcpy(metadata.data.stream_info.md5sum, b+8, 16);
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case FLAC__METADATA_TYPE_PADDING:
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case FLAC__METADATA_TYPE_APPLICATION:
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memcpy(buf, metadata.data.application.id, 4);
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metadata.data.application.data = buf+4;
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case FLAC__METADATA_TYPE_SEEKTABLE:
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metadata.data.seek_table.num_points = metadata.length / SEEKPOINT_LEN_;
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b = buf; /* we leave the points in buf for printing later */
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printf("SKIPPING block of unknown type\n");
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switch(metadata.type) {
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case FLAC__METADATA_TYPE_STREAMINFO:
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printf(" minumum blocksize: %u samples\n", metadata.data.stream_info.min_blocksize);
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printf(" maximum blocksize: %u samples\n", metadata.data.stream_info.max_blocksize);
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printf(" minimum framesize: %u bytes\n", metadata.data.stream_info.min_framesize);
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printf(" maximum framesize: %u bytes\n", metadata.data.stream_info.max_framesize);
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printf(" sample_rate: %u Hz\n", metadata.data.stream_info.sample_rate);
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printf(" channels: %u\n", metadata.data.stream_info.channels);
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printf(" bits-per-sample: %u\n", metadata.data.stream_info.bits_per_sample);
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printf(" total samples: %llu\n", metadata.data.stream_info.total_samples);
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printf(" MD5 signature: ");
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for(i = 0; i < 16; i++)
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printf("%02x", metadata.data.stream_info.md5sum[i]);
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case FLAC__METADATA_TYPE_PADDING:
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printf(" pad contents:\n");
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hexdump(buf, metadata.length, " ");
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case FLAC__METADATA_TYPE_APPLICATION:
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printf(" application ID: ");
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for(i = 0; i < 4; i++)
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printf("%02x", metadata.data.application.id[i]);
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printf(" data contents:\n");
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hexdump(metadata.data.application.data, metadata.length, " ");
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case FLAC__METADATA_TYPE_SEEKTABLE:
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printf(" seek points: %u\n", metadata.data.seek_table.num_points);
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for(i = 0; i < metadata.data.seek_table.num_points; i++, b += SEEKPOINT_LEN_)
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printf(" point %d: sample_number=%llu, stream_offset=%llu, frame_samples=%u\n", i, unpack_uint64(b, 8), unpack_uint64(b+8, 8), unpack_uint32(b+16, 2));
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byte_offset += (4 + metadata.length);
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} while (!metadata.is_last);
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FLAC__uint32 unpack_uint32(FLAC__byte *b, unsigned bytes)
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FLAC__uint32 ret = 0;
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for(i = 0; i < bytes; i++)
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ret = (ret << 8) | (FLAC__uint32)(*b++);
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FLAC__uint64 unpack_uint64(FLAC__byte *b, unsigned bytes)
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FLAC__uint64 ret = 0;
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for(i = 0; i < bytes; i++)
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ret = (ret << 8) | (FLAC__uint64)(*b++);
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void hexdump(const FLAC__byte *buf, unsigned bytes, const char *indent)
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unsigned i, left = bytes;
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const FLAC__byte *b = buf;
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for(i = 0; i < bytes; i += 16) {
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"%02X %02X %02X %02X %02X %02X %02X %02X "
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"%02X %02X %02X %02X %02X %02X %02X %02X "
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"%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c\n",
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left > 0? (unsigned char)b[ 0] : 0,
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left > 1? (unsigned char)b[ 1] : 0,
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left > 2? (unsigned char)b[ 2] : 0,
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left > 3? (unsigned char)b[ 3] : 0,
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left > 4? (unsigned char)b[ 4] : 0,
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left > 5? (unsigned char)b[ 5] : 0,
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left > 6? (unsigned char)b[ 6] : 0,
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left > 7? (unsigned char)b[ 7] : 0,
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left > 8? (unsigned char)b[ 8] : 0,
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left > 9? (unsigned char)b[ 9] : 0,
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left > 10? (unsigned char)b[10] : 0,
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left > 11? (unsigned char)b[11] : 0,
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left > 12? (unsigned char)b[12] : 0,
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left > 13? (unsigned char)b[13] : 0,
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left > 14? (unsigned char)b[14] : 0,
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left > 15? (unsigned char)b[15] : 0,
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(left > 0) ? (isprint(b[ 0]) ? b[ 0] : '.') : ' ',
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(left > 1) ? (isprint(b[ 1]) ? b[ 1] : '.') : ' ',
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(left > 2) ? (isprint(b[ 2]) ? b[ 2] : '.') : ' ',
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(left > 3) ? (isprint(b[ 3]) ? b[ 3] : '.') : ' ',
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(left > 4) ? (isprint(b[ 4]) ? b[ 4] : '.') : ' ',
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(left > 5) ? (isprint(b[ 5]) ? b[ 5] : '.') : ' ',
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(left > 6) ? (isprint(b[ 6]) ? b[ 6] : '.') : ' ',
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(left > 7) ? (isprint(b[ 7]) ? b[ 7] : '.') : ' ',
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(left > 8) ? (isprint(b[ 8]) ? b[ 8] : '.') : ' ',
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(left > 9) ? (isprint(b[ 9]) ? b[ 9] : '.') : ' ',
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(left > 10) ? (isprint(b[10]) ? b[10] : '.') : ' ',
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(left > 11) ? (isprint(b[11]) ? b[11] : '.') : ' ',
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(left > 12) ? (isprint(b[12]) ? b[12] : '.') : ' ',
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(left > 13) ? (isprint(b[13]) ? b[13] : '.') : ' ',
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(left > 14) ? (isprint(b[14]) ? b[14] : '.') : ' ',
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(left > 15) ? (isprint(b[15]) ? b[15] : '.') : ' '