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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* fragtbl.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "internal.h"
static int grow_fragment_table(sqfs_block_processor_t *proc)
{
size_t newsz;
void *new;
if (proc->num_fragments >= proc->max_fragments) {
newsz = proc->max_fragments ? proc->max_fragments * 2 : 16;
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 grow_deduplication_list(sqfs_block_processor_t *proc)
{
size_t new_sz;
void *new;
if (proc->frag_list_num == proc->frag_list_max) {
new_sz = proc->frag_list_max * 2;
new = realloc(proc->frag_list,
sizeof(proc->frag_list[0]) * new_sz);
if (new == NULL)
return SQFS_ERROR_ALLOC;
proc->frag_list = new;
proc->frag_list_max = new_sz;
}
return 0;
}
static int store_fragment(sqfs_block_processor_t *proc, sqfs_block_t *frag,
uint64_t signature)
{
int err = grow_deduplication_list(proc);
if (err)
return err;
proc->frag_list[proc->frag_list_num].index = proc->frag_block->index;
proc->frag_list[proc->frag_list_num].offset = proc->frag_block->size;
proc->frag_list[proc->frag_list_num].signature = signature;
proc->frag_list_num += 1;
sqfs_inode_set_frag_location(frag->inode, proc->frag_block->index,
proc->frag_block->size);
memcpy(proc->frag_block->data + proc->frag_block->size,
frag->data, frag->size);
proc->frag_block->flags |= (frag->flags & SQFS_BLK_DONT_COMPRESS);
proc->frag_block->size += frag->size;
return 0;
}
int handle_fragment(sqfs_block_processor_t *proc, sqfs_block_t *frag,
sqfs_block_t **blk_out)
{
uint64_t signature;
size_t i, size;
int err;
signature = MK_BLK_SIG(frag->checksum, frag->size);
for (i = 0; i < proc->frag_list_num; ++i) {
if (proc->frag_list[i].signature == signature) {
sqfs_inode_set_frag_location(frag->inode,
proc->frag_list[i].index,
proc->frag_list[i].offset);
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) {
size = sizeof(sqfs_block_t) + proc->max_block_size;
err = grow_fragment_table(proc);
if (err)
goto fail;
proc->frag_block = calloc(1, size);
if (proc->frag_block == NULL) {
err = SQFS_ERROR_ALLOC;
goto fail;
}
proc->frag_block->index = proc->num_fragments++;
proc->frag_block->flags = SQFS_BLK_FRAGMENT_BLOCK;
}
err = store_fragment(proc, frag, signature);
if (err)
goto fail;
return 0;
fail:
free(*blk_out);
*blk_out = NULL;
return err;
}
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