mirror of
https://github.com/kanjitalk755/macemu.git
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161 lines
4.1 KiB
C++
161 lines
4.1 KiB
C++
/*
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* vhd_unix.cpp -- support for disk images in vhd format
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*
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* (C) 2010 Geoffrey Brown
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "sysdeps.h"
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#include "disk_unix.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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extern "C" {
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#include <libvhd.h>
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}
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// libvhd.h defines DEBUG
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#undef DEBUG
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#define DEBUG 0
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#include "debug.h"
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static disk_generic::status vhd_unix_open(const char *name, int *size,
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bool read_only, vhd_context_t **ctx)
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{
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int amode = read_only ? R_OK : (R_OK | W_OK);
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int fid;
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vhd_context_t *vhd;
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D(bug("vhd open %s\n", name));
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if (access(name, amode)) {
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D(bug("vhd open -- incorrect permissions %s\n", name));
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return disk_generic::DISK_UNKNOWN;
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}
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if (! (fid = open(name, O_RDONLY))) {
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D(bug("vhd open -- couldn't open file %s\n", name));
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return disk_generic::DISK_UNKNOWN;
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}
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else {
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char buf[9];
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read(fid, buf, sizeof(buf)-1);
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buf[8] = 0;
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close(fid);
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if (strcmp("conectix", buf) != 0) {
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D(bug("vhd open -- not vhd magic = %s\n", buf));
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return disk_generic::DISK_UNKNOWN;
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}
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if (vhd = (vhd_context_t *) malloc(sizeof(vhd_context_t))) {
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int err;
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if (err = vhd_open(vhd, name, read_only ?
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VHD_OPEN_RDONLY : VHD_OPEN_RDWR)) {
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D(bug("vhd_open failed (%d)\n", err));
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free(vhd);
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return disk_generic::DISK_INVALID;
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}
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else {
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*size = (int) vhd->footer.curr_size;
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printf("VHD Open %s\n", name);
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*ctx = vhd;
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return disk_generic::DISK_VALID;
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}
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}
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else {
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D(bug("vhd open -- malloc failed\n"));
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return disk_generic::DISK_INVALID;
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}
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}
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}
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static int vhd_unix_read(vhd_context_t *ctx, void *buffer, loff_t offset,
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size_t length)
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{
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int err;
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if ((offset % VHD_SECTOR_SIZE) || (length % VHD_SECTOR_SIZE)) {
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printf("vhd read only supported on sector boundaries (%d)\n",
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VHD_SECTOR_SIZE);
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return 0;
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}
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if (err = vhd_io_read(ctx, (char *) buffer, offset / VHD_SECTOR_SIZE,
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length / VHD_SECTOR_SIZE)){
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D(bug("vhd read error %d\n", err));
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return err;
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}
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else
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return length;
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}
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static int vhd_unix_write(vhd_context_t *ctx, void *buffer, loff_t offset,
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size_t length)
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{
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int err;
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if ((offset % VHD_SECTOR_SIZE) || (length % VHD_SECTOR_SIZE)) {
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printf("vhd write only supported on sector boundaries (%d)\n",
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VHD_SECTOR_SIZE);
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return 0;
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}
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if (err = vhd_io_write(ctx, (char *) buffer, offset/VHD_SECTOR_SIZE,
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length/VHD_SECTOR_SIZE)) {
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D(bug("vhd write error %d\n", err));
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return err;
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}
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else
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return length;
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}
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static void vhd_unix_close(vhd_context_t *ctx)
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{
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D(bug("vhd close\n"));
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vhd_close(ctx);
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free(ctx);
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}
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struct disk_vhd : disk_generic {
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disk_vhd(vhd_context_t *ctx, bool read_only, loff_t size)
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: ctx(ctx), read_only(read_only), file_size(size) { }
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virtual ~disk_vhd() { vhd_unix_close(ctx); }
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virtual bool is_read_only() { return read_only; }
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virtual loff_t size() { return file_size; }
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virtual size_t read(void *buf, loff_t offset, size_t length) {
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return vhd_unix_read(ctx, buf, offset, length);
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}
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virtual size_t write(void *buf, loff_t offset, size_t length) {
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return vhd_unix_write(ctx, buf, offset, length);
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}
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protected:
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vhd_context_t *ctx;
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bool read_only;
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loff_t file_size;
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};
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disk_generic::status disk_vhd_factory(const char *path,
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bool read_only, disk_generic **disk) {
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int size;
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vhd_context_t *ctx = NULL;
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disk_generic::status st = vhd_unix_open(path, &size, read_only, &ctx);
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if (st == disk_generic::DISK_VALID)
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*disk = new disk_vhd(ctx, read_only, size);
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return st;
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}
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