forked from mia/Aegisub
80a209e95a
Rename lots of things, THIS BREAKS THE AEGISUB BUILD because of changed exported type and function names. Fixed an uninitialized memory bug that would make it crash on unindexed audio tracks in mastroska. Made ffms.h C-friendlier. Exports the start time of an audio track in the audio properties. Less signedness and type conversion warnings. Originally committed to SVN as r2940.
122 lines
3.5 KiB
C
122 lines
3.5 KiB
C
// Copyright (c) 2007-2009 Fredrik Mellbin
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#include "stdiostream.h"
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#include <errno.h>
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#ifdef __UNIX__
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#define _fseeki64 fseeko
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#define _ftelli64 ftello
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#endif
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/* StdIoStream methods */
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/* read count bytes into buffer starting at file position pos
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* return the number of bytes read, -1 on error or 0 on EOF
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*/
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int StdIoRead(StdIoStream *st, ulonglong pos, void *buffer, int count) {
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size_t rd;
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if (_fseeki64(st->fp, pos, SEEK_SET)) {
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st->error = errno;
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return -1;
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}
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rd = fread(buffer, 1, count, st->fp);
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if (rd == 0) {
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if (feof(st->fp))
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return 0;
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st->error = errno;
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return -1;
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}
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return rd;
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}
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/* scan for a signature sig(big-endian) starting at file position pos
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* return position of the first byte of signature or -1 if error/not found
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*/
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longlong StdIoScan(StdIoStream *st, ulonglong start, unsigned signature) {
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int c;
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unsigned cmp = 0;
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FILE *fp = st->fp;
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if (_fseeki64(fp, start, SEEK_SET))
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return -1;
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while ((c = getc(fp)) != EOF) {
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cmp = ((cmp << 8) | c) & 0xffffffff;
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if (cmp == signature)
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return _ftelli64(fp) - 4;
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}
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return -1;
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}
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/* return cache size, this is used to limit readahead */
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unsigned StdIoGetCacheSize(StdIoStream *st) {
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return CACHESIZE;
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}
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/* return last error message */
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const char *StdIoGetLastError(StdIoStream *st) {
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return strerror(st->error);
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}
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/* memory allocation, this is done via stdlib */
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void *StdIoMalloc(StdIoStream *st, size_t size) {
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return malloc(size);
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}
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void *StdIoRealloc(StdIoStream *st, void *mem, size_t size) {
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return realloc(mem,size);
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}
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void StdIoFree(StdIoStream *st, void *mem) {
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free(mem);
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}
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/* progress report handler for lengthy operations
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* returns 0 to abort operation, nonzero to continue
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*/
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int StdIoProgress(StdIoStream *st, ulonglong cur, ulonglong max) {
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return 1;
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}
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longlong StdIoGetFileSize(StdIoStream *st) {
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longlong epos = 0;
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longlong cpos = _ftelli64(st->fp);
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_fseeki64(st->fp, 0, SEEK_END);
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epos = _ftelli64(st->fp);
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_fseeki64(st->fp, cpos, SEEK_SET);
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return epos;
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}
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void InitStdIoStream(StdIoStream *st) {
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memset(st,0,sizeof(StdIoStream));
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st->base.read = StdIoRead;
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st->base.scan = StdIoScan;
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st->base.getcachesize = StdIoGetCacheSize;
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st->base.geterror = StdIoGetLastError;
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st->base.memalloc = StdIoMalloc;
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st->base.memrealloc = StdIoRealloc;
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st->base.memfree = StdIoFree;
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st->base.progress = StdIoProgress;
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st->base.getfilesize = StdIoGetFileSize;
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}
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