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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* process_block.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "internal.h"
#include <string.h>
static int store_block_location(sqfs_data_writer_t *proc, sqfs_u64 offset,
sqfs_u32 size, sqfs_u32 chksum)
{
size_t new_sz;
void *new;
if (proc->num_blocks == proc->max_blocks) {
new_sz = proc->max_blocks * 2;
new = realloc(proc->blocks, sizeof(proc->blocks[0]) * new_sz);
if (new == NULL)
return SQFS_ERROR_ALLOC;
proc->blocks = new;
proc->max_blocks = new_sz;
}
proc->blocks[proc->num_blocks].offset = offset;
proc->blocks[proc->num_blocks].hash = MK_BLK_HASH(chksum, size);
proc->num_blocks += 1;
return 0;
}
static size_t deduplicate_blocks(sqfs_data_writer_t *proc, size_t count)
{
size_t i, j;
for (i = 0; i < proc->file_start; ++i) {
for (j = 0; j < count; ++j) {
if (proc->blocks[i + j].hash !=
proc->blocks[proc->file_start + j].hash)
break;
}
if (j == count)
break;
}
return i;
}
static int align_file(sqfs_data_writer_t *proc, sqfs_block_t *blk)
{
sqfs_u32 chksum;
void *padding;
sqfs_u64 size;
size_t diff;
int ret;
if (!(blk->flags & SQFS_BLK_ALIGN))
return 0;
size = proc->file->get_size(proc->file);
diff = size % proc->devblksz;
if (diff == 0)
return 0;
padding = calloc(1, diff);
if (padding == 0)
return SQFS_ERROR_ALLOC;
if (proc->hooks != NULL && proc->hooks->prepare_padding != NULL)
proc->hooks->prepare_padding(proc->user_ptr, padding, diff);
chksum = crc32(0, padding, diff);
ret = proc->file->write_at(proc->file, size, padding, diff);
free(padding);
if (ret)
return ret;
return store_block_location(proc, size, diff | (1 << 24), chksum);
}
int process_completed_block(sqfs_data_writer_t *proc, sqfs_block_t *blk)
{
sqfs_u64 offset, bytes;
size_t start, count;
sqfs_u32 out;
int err;
if (proc->hooks != NULL && proc->hooks->pre_block_write != NULL) {
proc->hooks->pre_block_write(proc->user_ptr, blk, proc->file);
}
if (blk->flags & SQFS_BLK_FIRST_BLOCK) {
proc->start = proc->file->get_size(proc->file);
proc->file_start = proc->num_blocks;
err = align_file(proc, blk);
if (err)
return err;
}
if (blk->size != 0) {
out = blk->size;
if (!(blk->flags & SQFS_BLK_IS_COMPRESSED))
out |= 1 << 24;
offset = proc->file->get_size(proc->file);
if (blk->flags & SQFS_BLK_FRAGMENT_BLOCK) {
offset = htole64(offset);
proc->fragments[blk->index].start_offset = offset;
proc->fragments[blk->index].pad0 = 0;
proc->fragments[blk->index].size = htole32(out);
} else {
blk->inode->block_sizes[blk->index] = out;
}
err = store_block_location(proc, offset, out, blk->checksum);
if (err)
return err;
err = proc->file->write_at(proc->file, offset,
blk->data, blk->size);
if (err)
return err;
}
if (proc->hooks != NULL && proc->hooks->post_block_write != NULL) {
proc->hooks->post_block_write(proc->user_ptr, blk, proc->file);
}
if (blk->flags & SQFS_BLK_LAST_BLOCK) {
err = align_file(proc, blk);
if (err)
return err;
count = proc->num_blocks - proc->file_start;
start = deduplicate_blocks(proc, count);
offset = proc->blocks[start].offset;
sqfs_inode_set_file_block_start(blk->inode, offset);
if (start >= proc->file_start)
return 0;
offset = start + count;
if (offset >= proc->file_start) {
count = proc->num_blocks - offset;
proc->num_blocks = offset;
} else {
proc->num_blocks = proc->file_start;
}
if (proc->hooks != NULL &&
proc->hooks->notify_blocks_erased != NULL) {
bytes = proc->file->get_size(proc->file) - proc->start;
proc->hooks->notify_blocks_erased(proc->user_ptr,
count, bytes);
}
err = proc->file->truncate(proc->file, proc->start);
if (err)
return err;
}
return 0;
}
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