forked from mia/Aegisub
92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
// Copyright (c) 2007 Fredrik Mellbin
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in
|
|
// all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
// THE SOFTWARE.
|
|
|
|
#include "stdiostream.h"
|
|
|
|
/* StdIoStream methods */
|
|
|
|
/* read count bytes into buffer starting at file position pos
|
|
* return the number of bytes read, -1 on error or 0 on EOF
|
|
*/
|
|
int StdIoRead(StdIoStream *st, ulonglong pos, void *buffer, int count) {
|
|
size_t rd;
|
|
if (_fseeki64(st->fp, pos, SEEK_SET)) {
|
|
st->error = errno;
|
|
return -1;
|
|
}
|
|
rd = fread(buffer, 1, count, st->fp);
|
|
if (rd == 0) {
|
|
if (feof(st->fp))
|
|
return 0;
|
|
st->error = errno;
|
|
return -1;
|
|
}
|
|
return rd;
|
|
}
|
|
|
|
/* scan for a signature sig(big-endian) starting at file position pos
|
|
* return position of the first byte of signature or -1 if error/not found
|
|
*/
|
|
longlong StdIoScan(StdIoStream *st, ulonglong start, unsigned signature) {
|
|
int c;
|
|
unsigned cmp = 0;
|
|
FILE *fp = st->fp;
|
|
|
|
if (_fseeki64(fp, start, SEEK_SET))
|
|
return -1;
|
|
|
|
while ((c = getc(fp)) != EOF) {
|
|
cmp = ((cmp << 8) | c) & 0xffffffff;
|
|
if (cmp == signature)
|
|
return _ftelli64(fp) - 4;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/* return cache size, this is used to limit readahead */
|
|
unsigned StdIoGetCacheSize(StdIoStream *st) {
|
|
return CACHESIZE;
|
|
}
|
|
|
|
/* return last error message */
|
|
const char *StdIoGetLastError(StdIoStream *st) {
|
|
return strerror(st->error);
|
|
}
|
|
|
|
/* memory allocation, this is done via stdlib */
|
|
void *StdIoMalloc(StdIoStream *st, size_t size) {
|
|
return malloc(size);
|
|
}
|
|
|
|
void *StdIoRealloc(StdIoStream *st, void *mem, size_t size) {
|
|
return realloc(mem,size);
|
|
}
|
|
|
|
void StdIoFree(StdIoStream *st, void *mem) {
|
|
free(mem);
|
|
}
|
|
|
|
/* progress report handler for lengthy operations
|
|
* returns 0 to abort operation, nonzero to continue
|
|
*/
|
|
int StdIoProgress(StdIoStream *st, ulonglong cur, ulonglong max) {
|
|
return 1;
|
|
}
|