99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
/*
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* Copyright (c) 2022 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* iso9660.c
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* iso9660 filesystem.
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*/
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#include <endian.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <time.h>
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#include <mount/blockdevice.h>
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#include <mount/filesystem.h>
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#include <mount/iso9660.h>
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#include <mount/uuid.h>
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#include "util.h"
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static size_t iso9660_probe_amount(struct blockdevice* bdev)
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{
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(void) bdev;
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size_t block_size = 2048 /* TODO: Actual block size? */;
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return 17 * block_size;
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}
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static bool iso9660_probe(struct blockdevice* bdev,
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const unsigned char* leading,
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size_t amount)
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{
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(void) bdev;
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size_t block_size = 2048 /* TODO: Actual block size? */;
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if ( amount < 17 * block_size )
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return false;
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size_t offset = 16 * block_size;
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return !memcmp(leading + offset + 1, "CD001", 5);
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}
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static void iso9660_release(struct filesystem* fs)
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{
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if ( !fs )
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return;
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free(fs);
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}
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static enum filesystem_error iso9660_inspect(struct filesystem** fs_ptr,
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struct blockdevice* bdev)
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{
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*fs_ptr = NULL;
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struct filesystem* fs = CALLOC_TYPE(struct filesystem);
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if ( !fs )
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return FILESYSTEM_ERROR_ERRNO;
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fs->bdev = bdev;
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fs->handler = &iso9660_handler;
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fs->handler_private = NULL;
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fs->fstype_name = "iso9660";
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fs->driver = "iso9660fs";
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size_t block_size = 2048 /* TODO: Actual block size? */;
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size_t offset = 16 * block_size;
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uint8_t pvd[2048];
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if ( blockdevice_preadall(bdev, pvd, sizeof(pvd), offset) != sizeof(pvd) )
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return iso9660_release(fs), FILESYSTEM_ERROR_ERRNO;
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// TODO: LABEL support using the volume name.
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char vol_set[128 + 1];
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memcpy(vol_set, pvd + 190, 128);
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vol_set[128] = '\0';
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for ( size_t i = 128; i && vol_set[i-1] == ' '; i-- )
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vol_set[i-1] = '\0';
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if ( uuid_validate(vol_set) )
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{
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fs->flags |= FILESYSTEM_FLAG_UUID;
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uuid_from_string(fs->uuid, vol_set);
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}
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return *fs_ptr = fs, FILESYSTEM_ERROR_NONE;
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}
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const struct filesystem_handler iso9660_handler =
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{
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.handler_name = "iso9660",
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.probe_amount = iso9660_probe_amount,
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.probe = iso9660_probe,
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.inspect = iso9660_inspect,
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.release = iso9660_release,
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};
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