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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* common.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "internal.h"
static int set_block_size(sqfs_inode_generic_t **inode,
sqfs_u32 index, sqfs_u32 size)
{
size_t min_size = (index + 1) * sizeof(sqfs_u32);
size_t avail = (*inode)->payload_bytes_available;
size_t newsz;
void *new;
if (avail < min_size) {
newsz = avail ? avail : (sizeof(sqfs_u32) * 4);
while (newsz < min_size)
newsz *= 2;
if (SZ_ADD_OV(newsz, sizeof(**inode), &newsz))
return SQFS_ERROR_OVERFLOW;
if (sizeof(size_t) > sizeof(sqfs_u32)) {
if ((newsz - sizeof(**inode)) > 0x0FFFFFFFFUL)
return SQFS_ERROR_OVERFLOW;
}
new = realloc((*inode), newsz);
if (new == NULL)
return SQFS_ERROR_ALLOC;
(*inode) = new;
(*inode)->payload_bytes_available = newsz - sizeof(**inode);
}
(*inode)->extra[index] = size;
if (min_size >= (*inode)->payload_bytes_used)
(*inode)->payload_bytes_used = min_size;
return 0;
}
static void release_old_block(sqfs_block_processor_t *proc, sqfs_block_t *blk)
{
sqfs_block_t *it;
if (blk->flags & SQFS_BLK_FRAGMENT_BLOCK && blk->frag_list != NULL) {
it = blk->frag_list;
while (it->next != NULL)
it = it->next;
it->next = proc->free_list;
proc->free_list = blk->frag_list;
}
blk->next = proc->free_list;
proc->free_list = blk;
}
static int process_completed_block(sqfs_block_processor_t *proc,
sqfs_block_t *blk)
{
sqfs_u64 location;
sqfs_u32 size;
int err;
err = proc->wr->write_data_block(proc->wr, blk->user, blk->size,
blk->checksum, blk->flags,
blk->data, &location);
if (err)
goto out;
proc->stats.output_bytes_generated += blk->size;
if (blk->flags & SQFS_BLK_IS_SPARSE) {
if (blk->inode != NULL) {
sqfs_inode_make_extended(*(blk->inode));
(*(blk->inode))->data.file_ext.sparse += blk->size;
err = set_block_size(blk->inode, blk->index, 0);
if (err)
goto out;
}
proc->stats.sparse_block_count += 1;
} else if (blk->size != 0) {
size = blk->size;
if (!(blk->flags & SQFS_BLK_IS_COMPRESSED))
size |= 1 << 24;
if (blk->flags & SQFS_BLK_FRAGMENT_BLOCK) {
err = sqfs_frag_table_set(proc->frag_tbl, blk->index,
location, size);
if (err)
goto out;
proc->stats.frag_block_count += 1;
} else {
if (blk->inode != NULL) {
err = set_block_size(blk->inode, blk->index,
size);
if (err)
goto out;
}
proc->stats.data_block_count += 1;
}
}
if (blk->flags & SQFS_BLK_LAST_BLOCK && blk->inode != NULL)
sqfs_inode_set_file_block_start(*(blk->inode), location);
out:
release_old_block(proc, blk);
return err;
}
static bool is_zero_block(unsigned char *ptr, size_t size)
{
return ptr[0] == 0 && memcmp(ptr, ptr + 1, size - 1) == 0;
}
static int process_block(sqfs_block_t *block, sqfs_compressor_t *cmp,
sqfs_u8 *scratch, size_t scratch_size)
{
sqfs_block_t *it;
size_t offset;
sqfs_s32 ret;
if (block->size == 0)
return 0;
if (block->flags & SQFS_BLK_FRAGMENT_BLOCK) {
offset = block->size;
for (it = block->frag_list; it != NULL; it = it->next) {
assert(offset >= it->size);
offset -= it->size;
memcpy(block->data + offset, it->data, it->size);
block->flags |= (it->flags & SQFS_BLK_DONT_COMPRESS);
}
}
if (!(block->flags & SQFS_BLK_IGNORE_SPARSE) &&
is_zero_block(block->data, block->size)) {
block->flags |= SQFS_BLK_IS_SPARSE;
return 0;
}
if (block->flags & SQFS_BLK_DONT_HASH) {
block->checksum = 0;
} else {
block->checksum = xxh32(block->data, block->size);
}
if (block->flags & (SQFS_BLK_IS_FRAGMENT | SQFS_BLK_DONT_COMPRESS))
return 0;
ret = cmp->do_block(cmp, block->data, block->size,
scratch, scratch_size);
if (ret < 0)
return ret;
if (ret > 0) {
memcpy(block->data, scratch, ret);
block->size = ret;
block->flags |= SQFS_BLK_IS_COMPRESSED;
}
return 0;
}
static int process_completed_fragment(sqfs_block_processor_t *proc,
sqfs_block_t *frag,
sqfs_block_t **blk_out)
{
sqfs_u32 index, offset;
size_t size;
int err;
if (frag->flags & SQFS_BLK_IS_SPARSE) {
if (frag->inode != NULL) {
sqfs_inode_make_extended(*(frag->inode));
set_block_size(frag->inode, frag->index, 0);
(*(frag->inode))->data.file_ext.sparse += frag->size;
}
proc->stats.sparse_block_count += 1;
release_old_block(proc, frag);
return 0;
}
proc->stats.total_frag_count += 1;
if (!(frag->flags & SQFS_BLK_DONT_DEDUPLICATE)) {
err = sqfs_frag_table_find_tail_end(proc->frag_tbl,
frag->checksum, frag->size,
&index, &offset);
if (err == 0) {
if (frag->inode != NULL) {
sqfs_inode_set_frag_location(*(frag->inode),
index, offset);
}
release_old_block(proc, frag);
return 0;
}
}
if (proc->frag_block != NULL) {
size = proc->frag_block->size + frag->size;
if (size > proc->max_block_size) {
*blk_out = proc->frag_block;
proc->frag_block = NULL;
}
}
if (proc->frag_block == NULL) {
err = sqfs_frag_table_append(proc->frag_tbl, 0, 0, &index);
if (err)
goto fail;
offset = 0;
proc->frag_block = frag;
proc->frag_block->index = index;
proc->frag_block->flags &= SQFS_BLK_DONT_COMPRESS;
proc->frag_block->flags |= SQFS_BLK_FRAGMENT_BLOCK;
proc->frag_block->frag_list = NULL;
} else {
index = proc->frag_block->index;
offset = proc->frag_block->size;
frag->next = proc->frag_block->frag_list;
proc->frag_block->frag_list = frag;
proc->frag_block->size += frag->size;
}
err = sqfs_frag_table_add_tail_end(proc->frag_tbl, index, offset,
frag->size, frag->checksum);
if (err)
goto fail_outblk;
if (frag->inode != NULL)
sqfs_inode_set_frag_location(*(frag->inode), index, offset);
proc->stats.actual_frag_count += 1;
return 0;
fail:
release_old_block(proc, frag);
fail_outblk:
if (*blk_out != NULL) {
release_old_block(proc, *blk_out);
*blk_out = NULL;
}
return err;
}
int block_processor_init(sqfs_block_processor_t *base, size_t max_block_size,
sqfs_compressor_t *cmp, sqfs_block_writer_t *wr,
sqfs_frag_table_t *tbl)
{
base->process_completed_block = process_completed_block;
base->process_completed_fragment = process_completed_fragment;
base->process_block = process_block;
base->max_block_size = max_block_size;
base->cmp = cmp;
base->frag_tbl = tbl;
base->wr = wr;
base->stats.size = sizeof(base->stats);
return 0;
}
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