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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* frontend.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "internal.h"
static sqfs_block_t *get_new_block(sqfs_block_processor_t *proc)
{
sqfs_block_t *blk;
if (proc->free_list != NULL) {
blk = proc->free_list;
proc->free_list = blk->next;
} else {
blk = malloc(sizeof(*blk) + proc->max_block_size);
}
if (blk != NULL)
memset(blk, 0, sizeof(*blk));
return blk;
}
static int add_sentinel_block(sqfs_block_processor_t *proc)
{
sqfs_block_t *blk = get_new_block(proc);
if (blk == NULL)
return SQFS_ERROR_ALLOC;
blk->inode = proc->inode;
blk->flags = proc->blk_flags | SQFS_BLK_LAST_BLOCK;
return append_to_work_queue(proc, blk);
}
static int flush_block(sqfs_block_processor_t *proc)
{
sqfs_block_t *block = proc->blk_current;
proc->blk_current = NULL;
if (block->size < proc->max_block_size &&
!(block->flags & SQFS_BLK_DONT_FRAGMENT)) {
block->flags |= SQFS_BLK_IS_FRAGMENT;
} else {
proc->blk_flags &= ~SQFS_BLK_FIRST_BLOCK;
}
block->index = proc->blk_index++;
return append_to_work_queue(proc, block);
}
int sqfs_block_processor_begin_file(sqfs_block_processor_t *proc,
sqfs_inode_generic_t **inode, sqfs_u32 flags)
{
if (proc->inode != NULL)
return SQFS_ERROR_SEQUENCE;
if (flags & ~SQFS_BLK_USER_SETTABLE_FLAGS)
return SQFS_ERROR_UNSUPPORTED;
(*inode) = calloc(1, sizeof(sqfs_inode_generic_t));
if ((*inode) == NULL)
return SQFS_ERROR_ALLOC;
(*inode)->base.type = SQFS_INODE_FILE;
sqfs_inode_set_frag_location(*inode, 0xFFFFFFFF, 0xFFFFFFFF);
proc->inode = inode;
proc->blk_flags = flags | SQFS_BLK_FIRST_BLOCK;
proc->blk_index = 0;
return 0;
}
int sqfs_block_processor_append(sqfs_block_processor_t *proc, const void *data,
size_t size)
{
sqfs_block_t *new;
sqfs_u64 filesize;
size_t diff;
int err;
sqfs_inode_get_file_size(*(proc->inode), &filesize);
sqfs_inode_set_file_size(*(proc->inode), filesize + size);
while (size > 0) {
if (proc->blk_current == NULL) {
new = get_new_block(proc);
if (new == NULL)
return SQFS_ERROR_ALLOC;
proc->blk_current = new;
proc->blk_current->flags = proc->blk_flags;
proc->blk_current->inode = proc->inode;
}
diff = proc->max_block_size - proc->blk_current->size;
if (diff == 0) {
err = flush_block(proc);
if (err)
return err;
continue;
}
if (diff > size)
diff = size;
memcpy(proc->blk_current->data + proc->blk_current->size,
data, diff);
size -= diff;
proc->blk_current->size += diff;
data = (const char *)data + diff;
proc->stats.input_bytes_read += diff;
}
if (proc->blk_current != NULL &&
proc->blk_current->size == proc->max_block_size) {
return flush_block(proc);
}
return 0;
}
int sqfs_block_processor_end_file(sqfs_block_processor_t *proc)
{
int err;
if (proc->inode == NULL)
return SQFS_ERROR_SEQUENCE;
if (!(proc->blk_flags & SQFS_BLK_FIRST_BLOCK)) {
if (proc->blk_current != NULL &&
(proc->blk_flags & SQFS_BLK_DONT_FRAGMENT)) {
proc->blk_current->flags |= SQFS_BLK_LAST_BLOCK;
} else {
err = add_sentinel_block(proc);
if (err)
return err;
}
}
if (proc->blk_current != NULL) {
err = flush_block(proc);
if (err)
return err;
}
proc->inode = NULL;
proc->blk_flags = 0;
return 0;
}
const sqfs_block_processor_stats_t
*sqfs_block_processor_get_stats(const sqfs_block_processor_t *proc)
{
return &proc->stats;
}
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