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create a new fskip_ahead() to unify all the forward seeking that is done

This commit is contained in:
Josh Coalson 2004-09-23 00:34:54 +00:00
parent 9f3ac317c8
commit cfdb07f513
1 changed files with 45 additions and 101 deletions
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114
src/flac/encode.c
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@ -155,6 +155,7 @@ static FLAC__bool read_little_endian_uint32(FILE *f, FLAC__uint32 *val, FLAC__bo
static FLAC__bool read_big_endian_uint16(FILE *f, FLAC__uint16 *val, FLAC__bool eof_ok, const char *fn);
static FLAC__bool read_big_endian_uint32(FILE *f, FLAC__uint32 *val, FLAC__bool eof_ok, const char *fn);
static FLAC__bool read_sane_extended(FILE *f, FLAC__uint32 *val, FLAC__bool eof_ok, const char *fn);
static FLAC__bool fskip_ahead(FILE *f, FLAC__uint64 offset);
/*
* public routines
@ -264,15 +265,10 @@ flac__encode_aif(FILE *infile, long infilesize, const char *infilename, const ch
sample_rate= xx;
/* skip any extra data in the COMM chunk */
FLAC__ASSERT(skip<=LONG_MAX);
while(skip>0U && fseek(infile, skip, SEEK_CUR)<0) {
unsigned int need= min(skip, sizeof ucbuffer_);
if(fread(ucbuffer_, 1U, need, infile)<need) {
if(!fskip_ahead(infile, skip)) {
flac__utils_printf(stderr, 1, "%s: ERROR during read while skipping extra COMM data\n", encoder_session.inbasefilename);
return EncoderSession_finish_error(&encoder_session);
}
skip-= need;
}
/*
* now that we know the sample rate, canonicalize the
@ -318,7 +314,9 @@ flac__encode_aif(FILE *infile, long infilesize, const char *infilename, const ch
}
block_size= xx;
if(fseek(infile, offset, SEEK_CUR)) {
/* skip any SSND offset bytes */
FLAC__ASSERT(offset<=LONG_MAX);
if(!fskip_ahead(infile, offset)) {
flac__utils_printf(stderr, 1, "%s: ERROR: skipping offset in SSND chunk\n", encoder_session.inbasefilename);
return EncoderSession_finish_error(&encoder_session);
}
@ -341,26 +339,10 @@ flac__encode_aif(FILE *infile, long infilesize, const char *infilename, const ch
FLAC__ASSERT(!options.common.sector_align || encoder_session.until == 0);
if(encoder_session.skip>0U) {
FLAC__uint64 remaining= encoder_session.skip*bytes_per_frame;
/* do 1<<30 bytes at a time, since 1<<30 is a nice round number, and */
/* is guaranteed to be less than LONG_MAX */
while(remaining>0U)
{
unsigned long skip= (unsigned long)(remaining % (1U<<30));
FLAC__ASSERT(skip<=LONG_MAX);
while(skip>0 && fseek(infile, skip, SEEK_CUR)<0) {
unsigned int need= min(skip, sizeof ucbuffer_);
if(fread(ucbuffer_, 1U, need, infile)<need) {
if(!fskip_ahead(infile, encoder_session.skip*bytes_per_frame)) {
flac__utils_printf(stderr, 1, "%s: ERROR during read while skipping samples\n", encoder_session.inbasefilename);
return EncoderSession_finish_error(&encoder_session);
}
skip-= need;
}
remaining-= skip;
}
}
data_bytes-= (unsigned int)encoder_session.skip*bytes_per_frame; /*@@@ WATCHOUT: 4GB limit */
@ -439,28 +421,11 @@ flac__encode_aif(FILE *infile, long infilesize, const char *infilename, const ch
}
if(trim>0) {
FLAC__uint64 remaining= (unsigned int)trim*bytes_per_frame;
FLAC__ASSERT(!options.common.sector_align);
/* do 1<<30 bytes at a time, since 1<<30 is a nice round number, and */
/* is guaranteed to be less than LONG_MAX */
while(remaining>0U)
{
unsigned long skip= (unsigned long)(remaining % (1U<<30));
FLAC__ASSERT(skip<=LONG_MAX);
while(skip>0 && fseek(infile, skip, SEEK_CUR)<0) {
unsigned int need= min(skip, sizeof ucbuffer_);
if(fread(ucbuffer_, 1U, need, infile)<need) {
if(!fskip_ahead(infile, trim*bytes_per_frame)) {
flac__utils_printf(stderr, 1, "%s: ERROR during read while skipping samples\n", encoder_session.inbasefilename);
return EncoderSession_finish_error(&encoder_session);
}
skip-= need;
}
remaining-= skip;
}
}
/* now read unaligned samples into reservoir or pad with zeroes if necessary */
@ -530,14 +495,10 @@ flac__encode_aif(FILE *infile, long infilesize, const char *infilename, const ch
unsigned long skip= xx+(xx & 1U);
FLAC__ASSERT(skip<=LONG_MAX);
while(skip>0U && fseek(infile, skip, SEEK_CUR)<0) {
unsigned int need= min(skip, sizeof ucbuffer_);
if(fread(ucbuffer_, 1U, need, infile)<need) {
if(!fskip_ahead(infile, skip)) {
fprintf(stderr, "%s: ERROR during read while skipping unknown chunk\n", encoder_session.inbasefilename);
return EncoderSession_finish_error(&encoder_session);
}
skip-= need;
}
}
}
}
@ -711,18 +672,10 @@ int flac__encode_wav(FILE *infile, long infilesize, const char *infilename, cons
FLAC__ASSERT(!options.common.sector_align || encoder_session.until == 0);
if(encoder_session.skip > 0) {
if(fseek(infile, bytes_per_wide_sample * (unsigned)encoder_session.skip, SEEK_CUR) < 0) {
/* can't seek input, read ahead manually... */
unsigned left, need;
for(left = (unsigned)encoder_session.skip; left > 0; ) { /*@@@ WATCHOUT: 4GB limit */
need = min(left, CHUNK_OF_SAMPLES);
if(fread(ucbuffer_, bytes_per_wide_sample, need, infile) < need) {
if(!fskip_ahead(infile, encoder_session.skip * bytes_per_wide_sample)) {
flac__utils_printf(stderr, 1, "%s: ERROR during read while skipping samples\n", encoder_session.inbasefilename);
return EncoderSession_finish_error(&encoder_session);
}
left -= need;
}
}
}
data_bytes -= (unsigned)encoder_session.skip * bytes_per_wide_sample; /*@@@ WATCHOUT: 4GB limit */
@ -805,18 +758,11 @@ int flac__encode_wav(FILE *infile, long infilesize, const char *infilename, cons
}
if(trim > 0) {
if(fseek(infile, bytes_per_wide_sample * (unsigned)trim, SEEK_CUR) < 0) {
/* can't seek input, read ahead manually... */
unsigned left, need;
for(left = (unsigned)trim; left > 0; ) { /*@@@ WATCHOUT: 4GB limit */
need = min(left, CHUNK_OF_SAMPLES);
if(fread(ucbuffer_, bytes_per_wide_sample, need, infile) < need) {
FLAC__ASSERT(!options.common.sector_align);
if(!fskip_ahead(infile, trim * bytes_per_wide_sample)) {
flac__utils_printf(stderr, 1, "%s: ERROR during read while skipping samples\n", encoder_session.inbasefilename);
return EncoderSession_finish_error(&encoder_session);
}
left -= need;
}
}
}
/*
@ -896,19 +842,10 @@ int flac__encode_wav(FILE *infile, long infilesize, const char *infilename, cons
unsigned long skip = xx+(xx & 1U);
FLAC__ASSERT(skip<=LONG_MAX);
if(fseek(infile, skip, SEEK_CUR) < 0) {
/* can't seek input, read ahead manually... */
unsigned left, need;
const unsigned chunk = sizeof(ucbuffer_);
for(left = skip; left > 0; ) {
need = min(left, chunk);
if(fread(ucbuffer_, 1, need, infile) < need) {
if(!fskip_ahead(infile, skip)) {
flac__utils_printf(stderr, 1, "%s: ERROR during read while skipping unsupported sub-chunk\n", encoder_session.inbasefilename);
return EncoderSession_finish_error(&encoder_session);
}
left -= need;
}
}
}
}
}
@ -999,19 +936,10 @@ int flac__encode_raw(FILE *infile, long infilesize, const char *infilename, cons
if(skip_bytes > lookahead_length) {
skip_bytes -= lookahead_length;
lookahead_length = 0;
if(fseek(infile, (long)skip_bytes, SEEK_CUR) < 0) {
/* can't seek input, read ahead manually... */
unsigned left, need;
const unsigned chunk = sizeof(ucbuffer_);
for(left = skip_bytes; left > 0; ) {
need = min(left, chunk);
if(fread(ucbuffer_, 1, need, infile) < need) {
if(!fskip_ahead(infile, skip_bytes)) {
flac__utils_printf(stderr, 1, "%s: ERROR during read while skipping samples\n", encoder_session.inbasefilename);
return EncoderSession_finish_error(&encoder_session);
}
left -= need;
}
}
}
else {
lookahead += skip_bytes;
@ -2183,3 +2111,19 @@ FLAC__bool read_sane_extended(FILE *f, FLAC__uint32 *val, FLAC__bool eof_ok, con
return true;
}
FLAC__bool fskip_ahead(FILE *f, FLAC__uint64 offset)
{
static unsigned char dump[8192];
while(offset > 0) {
long need = (long)min(offset, LONG_MAX);
if(fseek(f, need, SEEK_CUR) < 0) {
need = min(offset, sizeof(dump));
if(fread(dump, need, 1, f) < 1)
return false;
}
offset -= need;
}
return true;
}