111 lines
3.2 KiB
C
111 lines
3.2 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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void InitStdIoStream(StdIoStream *st) {
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memset(st,0,sizeof(st));
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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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}
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