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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>
#include <zlib.h>
int sqfs_block_process(sqfs_block_t *block, sqfs_compressor_t *cmp,
uint8_t *scratch, size_t scratch_size)
{
ssize_t ret;
block->checksum = crc32(0, block->data, block->size);
if (!(block->flags & SQFS_BLK_DONT_COMPRESS)) {
ret = cmp->do_block(cmp, block->data, block->size,
scratch, scratch_size);
if (ret < 0) {
block->flags |= SQFS_BLK_COMPRESS_ERROR;
return ret;
}
if (ret > 0) {
memcpy(block->data, scratch, ret);
block->size = ret;
block->flags |= SQFS_BLK_IS_COMPRESSED;
}
}
return 0;
}
static int allign_file(sqfs_block_processor_t *proc, sqfs_block_t *blk)
{
if (!(blk->flags & SQFS_BLK_ALLIGN))
return 0;
return padd_sqfs(proc->file, proc->file->get_size(proc->file),
proc->devblksz);
}
static int store_block_location(sqfs_block_processor_t *proc, uint64_t offset,
uint32_t size, uint32_t 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].signature = MK_BLK_SIG(chksum, size);
proc->num_blocks += 1;
return 0;
}
static size_t deduplicate_blocks(sqfs_block_processor_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].signature !=
proc->blocks[proc->file_start + j].signature)
break;
}
if (j == count)
break;
}
return i;
}
static size_t grow_fragment_table(sqfs_block_processor_t *proc, size_t index)
{
size_t newsz;
void *new;
if (index < proc->max_fragments)
return 0;
do {
newsz = proc->max_fragments ? proc->max_fragments * 2 : 16;
} while (index >= newsz);
new = realloc(proc->fragments, sizeof(proc->fragments[0]) * newsz);
if (new == NULL)
return SQFS_ERROR_ALLOC;
proc->max_fragments = newsz;
proc->fragments = new;
return 0;
}
static int handle_block(sqfs_block_processor_t *proc, sqfs_block_t *blk)
{
size_t start, count;
uint64_t offset;
uint32_t out;
int err;
if (blk->flags & SQFS_BLK_FIRST_BLOCK) {
proc->start = proc->file->get_size(proc->file);
proc->file_start = proc->num_blocks;
err = allign_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) {
if (grow_fragment_table(proc, blk->index))
return 0;
offset = htole64(offset);
proc->fragments[blk->index].start_offset = offset;
proc->fragments[blk->index].pad0 = 0;
proc->fragments[blk->index].size = htole32(out);
if (blk->index >= proc->num_fragments)
proc->num_fragments = blk->index + 1;
} 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 (blk->flags & SQFS_BLK_LAST_BLOCK) {
err = allign_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) {
offset = start + count;
if (offset >= proc->file_start) {
proc->num_blocks = offset;
} else {
proc->num_blocks = proc->file_start;
}
err = proc->file->truncate(proc->file, proc->start);
if (err)
return err;
}
}
return 0;
}
int process_completed_blocks(sqfs_block_processor_t *proc, sqfs_block_t *queue)
{
sqfs_block_t *it;
while (queue != NULL) {
it = queue;
queue = queue->next;
if (it->flags & SQFS_BLK_COMPRESS_ERROR) {
proc->status = SQFS_ERROR_COMRPESSOR;
} else if (proc->status == 0) {
proc->status = handle_block(proc, it);
}
free(it);
}
return proc->status;
}
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