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