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/*
* Copyright (c) 2012 Dave Vasilevsky <dave@vasilevsky.ca>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "table.h"
#include "fs.h"
#include "nonstd.h"
#include "squashfs_fs.h"
#include "swap.h"
#include <stdlib.h>
#include <string.h>
sqfs_err sqfs_table_init(sqfs_table *table, sqfs_fd_t fd, sqfs_off_t start, size_t each,
size_t count) {
size_t i;
size_t nblocks, bread;
if (count == 0)
return SQFS_OK;
nblocks = sqfs_divceil(each * count, SQUASHFS_METADATA_SIZE);
bread = nblocks * sizeof(uint64_t);
table->each = each;
if (!(table->blocks = malloc(bread)))
goto err;
if (sqfs_pread(fd, table->blocks, bread, start) != bread)
goto err;
for (i = 0; i < nblocks; ++i)
sqfs_swapin64(&table->blocks[i]);
return SQFS_OK;
err:
free(table->blocks);
table->blocks = NULL;
return SQFS_ERR;
}
void sqfs_table_destroy(sqfs_table *table) {
free(table->blocks);
table->blocks = NULL;
}
sqfs_err sqfs_table_get(sqfs_table *table, sqfs *fs, size_t idx, void *buf) {
sqfs_block *block;
size_t pos = idx * table->each;
size_t bnum = pos / SQUASHFS_METADATA_SIZE,
off = pos % SQUASHFS_METADATA_SIZE;
sqfs_off_t bpos = table->blocks[bnum];
if (sqfs_md_cache(fs, &bpos, &block))
return SQFS_ERR;
memcpy(buf, (char*)(block->data) + off, table->each);
sqfs_block_dispose(block);
return SQFS_OK;
}
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