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/*-----------------------------------------------------------------*-C-*---
* File: handc/platform/mac/mapf.c
*
* Copyright (C)1997 Donovan Kolbly <d.kolbly@rscheme.org>
* as part of the RScheme project, licensed for free use.
* See <http://www.rscheme.org/> for the latest information.
*
* File version: 1.4
* File mod date: 1997.11.29 23:10:47
* System build: v0.7.2, 97.12.21
*
* Purpose: generic (stdio) file access for imageio
*------------------------------------------------------------------------*/
#include "mapf.h"
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include "smemory.h"
#include "osglue.h"
struct image_buffer {
void *block;
struct image_buffer *next;
};
static struct image_buffer *image_buffers;
static FILE *image_file;
rs_bool mapf_open( const char *path )
{
image_file = os_fopen( path, "rb" );
if (!image_file)
{
perror( path );
return NO;
}
image_buffers = NULL;
return YES;
}
void mapf_seek( UINT_32 offset )
{
int rc;
rc = fseek( image_file, offset, SEEK_SET );
assert( rc == 0 );
}
void *mapf_read( UINT_32 bytes )
{
struct image_buffer *b = (struct image_buffer *)malloc( sizeof( struct image_buffer ) );
int n;
b->next = image_buffers;
image_buffers = b;
b->block = malloc_aligned_32( bytes );
assert( b->block );
n = fread( b->block, 1, bytes, image_file );
assert( n == bytes );
return b->block;
}
void mapf_close( void )
{
struct image_buffer *b, *n;
for (b=image_buffers; b; b=n)
{
n = b->next;
free_aligned_32( b->block );
free( b );
}
}
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