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/*
* media.c -
*
* Written by Eryk Vershen (eryk@apple.com)
*/
/*
* Copyright 1997,1998 by Apple Computer, Inc.
* All Rights Reserved
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies and
* that both the copyright notice and this permission notice appear in
* supporting documentation.
*
* APPLE COMPUTER DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL APPLE COMPUTER BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
* NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
// for printf()
#include <stdio.h>
// for malloc() & free()
#include <stdlib.h>
#include "media.h"
/*
* Defines
*/
/*
* Types
*/
/*
* Global Constants
*/
/*
* Global Variables
*/
static media_kind = 0;
/*
* Forward declarations
*/
/*
* Routines
*/
long
allocate_media_kind(void)
{
media_kind++;
return media_kind;
}
MEDIA
new_media(long size)
{
return (MEDIA) malloc(size);
}
void
delete_media(MEDIA m)
{
if (m == 0) {
return;
}
free(m);
}
unsigned long
media_granularity(MEDIA m)
{
if (m == 0) {
return 0;
} else {
return m->grain;
}
}
long long
media_total_size(MEDIA m)
{
if (m == 0) {
return 0;
} else {
return m->size_in_bytes;
}
}
long
read_media(MEDIA m, long long offset, unsigned long count, void *address)
{
long result;
if (m != 0 && m->do_read != 0) {
//printf("media: read type %d, offset %Ld, count %d\n\t", m->kind, offset, count);
result = (*m->do_read)(m, offset, count, address);
//printf(" - returns %d\n", result);
return result;
} else {
return 0;
}
}
long
write_media(MEDIA m, long long offset, unsigned long count, void *address)
{
long result;
if (m != 0 && m->do_write != 0) {
//printf("media: write type %d, offset %Ld, count %d\n\t", m->kind, offset, count);
result = (*m->do_write)(m, offset, count, address);
//printf(" - returns %d\n", result);
return result;
} else {
return 0;
}
}
void
close_media(MEDIA m)
{
if (m == 0) {
return;
}
if (m->kind != 0) {
if (m->do_close != 0) {
(*m->do_close)(m);
}
m->kind = 0;
delete_media(m);
}
}
void
os_reload_media(MEDIA m)
{
if (m != 0 && m->do_os_reload != 0) {
(*m->do_os_reload)(m);
}
}
#pragma mark -
MEDIA_ITERATOR
new_media_iterator(long size)
{
return (MEDIA_ITERATOR) malloc(size);
}
void
private_delete_media_iterator(MEDIA_ITERATOR m)
{
if (m == 0) {
return;
}
free(m);
}
void
reset_media_iterator(MEDIA_ITERATOR m)
{
if (m != 0 && m->do_reset != 0) {
(*m->do_reset)(m);
}
}
char *
step_media_iterator(MEDIA_ITERATOR m)
{
char *result;
if (m != 0 && m->do_step != 0) {
result = (*m->do_step)(m);
} else {
result = 0;
}
return result;
}
void
delete_media_iterator(MEDIA_ITERATOR m)
{
if (m == 0) {
return;
}
if (m->kind != 0) {
if (m->do_delete != 0) {
(*m->do_delete)(m);
}
m->kind = 0;
private_delete_media_iterator(m);
}
}
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