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/*
* Cineon image file format library routines.
*
* Copyright 2006 Joseph Eagar (joeedh@gmail.com)
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "logImageCore.h"
int logimage_fseek(void* logfile, intptr_t offsett, int origin)
{
struct _Log_Image_File_t_ *file = (struct _Log_Image_File_t_*) logfile;
intptr_t offset = offsett;
if (file->file) fseek(file->file, offset, origin);
else { /*we're seeking in memory*/
if (origin==SEEK_SET) {
if (offset > file->membuffersize) return 1;
file->memcursor = file->membuffer + offset;
} else if (origin==SEEK_END) {
if (offset > file->membuffersize) return 1;
file->memcursor = (file->membuffer + file->membuffersize) - offset;
} else if (origin==SEEK_CUR) {
uintptr_t pos = (uintptr_t)file->membuffer - (uintptr_t)file->memcursor;
if (pos + offset > file->membuffersize) return 1;
if (pos < 0) return 1;
file->memcursor += offset;
}
}
return 0;
}
int logimage_fwrite(void *buffer, unsigned int size, unsigned int count, void *logfile)
{
struct _Log_Image_File_t_ *file = (struct _Log_Image_File_t_*) logfile;
if (file->file) return fwrite(buffer, size, count, file->file);
else { /*we're writing to memory*/
/*do nothing as this isn't supported yet*/
return count;
}
}
int logimage_fread(void *buffer, unsigned int size, unsigned int count, void *logfile)
{
struct _Log_Image_File_t_ *file = (struct _Log_Image_File_t_*) logfile;
if (file->file) return fread(buffer, size, count, file->file);
else { /*we're reading from memory*/
int i;
/*we convert ot uchar just on the off chance some platform can't handle
pointer arithmetic with type (void*). */
unsigned char *buf = (unsigned char *) buffer;
for (i=0; i<count; i++) {
memcpy(buf, file->memcursor, size);
file->memcursor += size;
buf += size;
}
return count;
}
}
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