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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* io.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "config.h"
#include "sqfs/io.h"
#include "sqfs/error.h"
#include "sqfs/block.h"
#include "util.h"
#include <stdlib.h>
int sqfs_file_create_block(sqfs_file_t *file, uint64_t offset,
size_t size, sqfs_inode_generic_t *inode,
uint32_t flags, sqfs_block_t **out)
{
sqfs_block_t *blk = alloc_flex(sizeof(*blk), 1, size);
int err;
if (blk == NULL)
return SQFS_ERROR_ALLOC;
err = file->read_at(file, offset, blk->data, size);
if (err) {
free(blk);
return err;
}
blk->inode = inode;
blk->size = size;
blk->flags = flags;
*out = blk;
return 0;
}
int sqfs_file_create_block_dense(sqfs_file_t *file, uint64_t offset,
size_t size, sqfs_inode_generic_t *inode,
uint32_t flags, const sqfs_sparse_map_t *map,
sqfs_block_t **out)
{
sqfs_block_t *blk = alloc_flex(sizeof(*blk), 1, size);
size_t dst_start, diff, count;
const sqfs_sparse_map_t *it;
uint64_t poffset, src_start;
int err;
if (blk == NULL)
return SQFS_ERROR_ALLOC;
poffset = 0;
for (it = map; it != NULL; it = it->next) {
if (it->offset + it->count <= offset) {
poffset += it->count;
continue;
}
if (it->offset >= offset + size) {
poffset += it->count;
continue;
}
count = size;
if (offset + count >= it->offset + it->count)
count = it->offset + it->count - offset;
if (it->offset < offset) {
diff = offset - it->offset;
src_start = poffset + diff;
dst_start = 0;
count -= diff;
} else if (it->offset > offset) {
diff = it->offset - offset;
src_start = poffset;
dst_start = diff;
} else {
src_start = poffset;
dst_start = 0;
}
err = file->read_at(file, src_start,
blk->data + dst_start, count);
if (err) {
free(blk);
return err;
}
poffset += it->count;
}
blk->inode = inode;
blk->size = size;
blk->flags = flags;
*out = blk;
return 0;
}
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