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/* flacdiff - Displays where two FLAC streams differ
* Copyright (C) 2007,2008,2009 Josh Coalson
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <string.h>
#include "FLAC++/decoder.h"
#include "share/compat.h"
#ifdef _MSC_VER
// warning C4800: 'int' : forcing to bool 'true' or 'false' (performance warning)
#pragma warning ( disable : 4800 )
#endif
class AutoFILE {
protected:
::FILE *f_;
public:
inline AutoFILE(const char *path, const char *mode): f_(::fopen(path, mode)) { }
inline virtual ~AutoFILE() { if (f_) (void)::fclose(f_); }
inline operator bool() const { return 0 != f_; }
inline operator const ::FILE *() const { return f_; }
inline operator ::FILE *() { return f_; }
private:
AutoFILE();
AutoFILE(const AutoFILE &);
void operator=(const AutoFILE &);
};
class Decoder: public FLAC::Decoder::Stream {
public:
Decoder(AutoFILE &f, FLAC__off_t tgt): tgtpos_((FLAC__uint64)tgt), curpos_(0), go_(true), err_(false), frame_(), f_(f) { memset(&frame_, 0, sizeof(::FLAC__Frame)); }
FLAC__uint64 tgtpos_, curpos_;
bool go_, err_;
::FLAC__Frame frame_;
protected:
AutoFILE &f_;
// from FLAC::Decoder::Stream
virtual ::FLAC__StreamDecoderReadStatus read_callback(FLAC__byte buffer[], size_t *bytes)
{
*bytes = fread(buffer, 1, *bytes, f_);
if(ferror((FILE*)f_))
return ::FLAC__STREAM_DECODER_READ_STATUS_ABORT;
else if(*bytes == 0 && feof((FILE*)f_))
return ::FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
else
return ::FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
}
virtual ::FLAC__StreamDecoderTellStatus tell_callback(FLAC__uint64 *absolute_byte_offset)
{
FLAC__off_t off = ftello(f_);
if(off < 0)
return ::FLAC__STREAM_DECODER_TELL_STATUS_ERROR;
*absolute_byte_offset = off;
return ::FLAC__STREAM_DECODER_TELL_STATUS_OK;
}
virtual bool eof_callback()
{
return (bool)feof((FILE*)f_);
}
virtual ::FLAC__StreamDecoderWriteStatus write_callback(const ::FLAC__Frame *frame, const FLAC__int32 * const /*buffer*/[])
{
FLAC__uint64 pos;
if(!get_decode_position(&pos)) {
go_ = false;
err_ = true;
return ::FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
if(pos > tgtpos_) {
go_ = false;
frame_ = *frame;
}
else
curpos_ = pos;
return ::FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}
virtual void error_callback(::FLAC__StreamDecoderErrorStatus status)
{
fprintf(stderr, "got error %d:%s\n", status, ::FLAC__StreamDecoderErrorStatusString[status]);
go_ = false;
err_ = true;
}
};
static bool show_diff(AutoFILE &f1, AutoFILE &f2, FLAC__off_t off)
{
Decoder d1(f1, off), d2(f2, off);
if(!d1) {
fprintf(stderr, "ERROR: setting up decoder1, state=%s\n", d1.get_state().resolved_as_cstring(d1));
return false;
}
if(!d2) {
fprintf(stderr, "ERROR: setting up decoder2, state=%s\n", d2.get_state().resolved_as_cstring(d2));
return false;
}
::FLAC__StreamDecoderInitStatus is;
if((is = d1.init()) != FLAC__STREAM_DECODER_INIT_STATUS_OK) {
fprintf(stderr, "ERROR: initializing decoder1, status=%s state=%s\n", FLAC__StreamDecoderInitStatusString[is], d1.get_state().resolved_as_cstring(d1));
return false;
}
if((is = d2.init()) != FLAC__STREAM_DECODER_INIT_STATUS_OK) {
fprintf(stderr, "ERROR: initializing decoder2, status=%s state=%s\n", FLAC__StreamDecoderInitStatusString[is], d2.get_state().resolved_as_cstring(d2));
return false;
}
if(!d1.process_until_end_of_metadata()) {
fprintf(stderr, "ERROR: skipping metadata in decoder1, state=%s\n", d1.get_state().resolved_as_cstring(d1));
return false;
}
if(!d2.process_until_end_of_metadata()) {
fprintf(stderr, "ERROR: skipping metadata in decoder2, state=%s\n", d2.get_state().resolved_as_cstring(d2));
return false;
}
while(d1.go_ && d2.go_) {
if(!d1.process_single()) {
fprintf(stderr, "ERROR: decoding frame in decoder1, state=%s\n", d1.get_state().resolved_as_cstring(d1));
return false;
}
if(!d2.process_single()) {
fprintf(stderr, "ERROR: decoding frame in decoder2, state=%s\n", d2.get_state().resolved_as_cstring(d2));
return false;
}
}
if(d1.err_) {
fprintf(stderr, "ERROR: got err_ in decoder1, state=%s\n", d1.get_state().resolved_as_cstring(d1));
return false;
}
if(d2.err_) {
fprintf(stderr, "ERROR: got err_ in decoder2, state=%s\n", d2.get_state().resolved_as_cstring(d2));
return false;
}
if(d1.go_ != d2.go_) {
fprintf(stderr, "ERROR: d1.go_(%s) != d2.go_(%s)\n", d1.go_?"true":"false", d2.go_?"true":"false");
return false;
}
fprintf(stdout, "pos1 = %" PRIu64 " blocksize=%u sample#%" PRIu64 " frame#%" PRIu64 "\n", d1.curpos_, d1.frame_.header.blocksize, d1.frame_.header.number.sample_number, d1.frame_.header.number.sample_number / d1.frame_.header.blocksize);
fprintf(stdout, "pos2 = %" PRIu64 " blocksize=%u sample#%" PRIu64 " frame#%" PRIu64 "\n", d2.curpos_, d2.frame_.header.blocksize, d2.frame_.header.number.sample_number, d2.frame_.header.number.sample_number / d2.frame_.header.blocksize);
return true;
}
static FLAC__off_t get_diff_offset(AutoFILE &f1, AutoFILE &f2)
{
FLAC__off_t off = 0;
while(1) {
if(feof((FILE*)f1) && feof((FILE*)f1)) {
fprintf(stderr, "ERROR: files are identical\n");
return -1;
}
if(feof((FILE*)f1)) {
fprintf(stderr, "ERROR: file1 EOF\n");
return -1;
}
if(feof((FILE*)f2)) {
fprintf(stderr, "ERROR: file2 EOF\n");
return -1;
}
if(fgetc(f1) != fgetc(f2))
return off;
off++;
}
}
static bool run(const char *fn1, const char *fn2)
{
FLAC__off_t off;
AutoFILE f1(fn1, "rb"), f2(fn2, "rb");
if(!f1) {
flac_fprintf(stderr, "ERROR: opening %s for reading\n", fn1);
return false;
}
if(!f2) {
flac_fprintf(stderr, "ERROR: opening %s for reading\n", fn2);
return false;
}
if((off = get_diff_offset(f1, f2)) < 0)
return false;
fprintf(stdout, "got diff offset = %" PRId64 "\n", off);
return show_diff(f1, f2, off);
}
int main(int argc, char *argv[])
{
const char *usage = "usage: flacdiff flacfile1 flacfile2\n";
#ifdef FLAC__STRINGS_IN_UTF8
if (get_utf8_argv(&argc, &argv) != 0) {
fprintf(stderr, "%ERROR: failed to convert command line parameters to UTF-8\n");
return 1;
}
#endif
if(argc > 1 && 0 == strcmp(argv[1], "-h")) {
printf(usage);
return 0;
}
else if(argc != 3) {
fprintf(stderr, usage);
return 255;
}
return run(argv[1], argv[2])? 0 : 1;
}
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