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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* data_writer.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "sqfs/data_writer.h"
#include "sqfs/block.h"
#include "data_writer.h"
#include "highlevel.h"
#include "util.h"
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <zlib.h>
struct data_writer_t {
sqfs_data_writer_t *proc;
sqfs_compressor_t *cmp;
sqfs_super_t *super;
data_writer_stats_t stats;
};
static void post_block_write(void *user, const sqfs_block_t *block,
sqfs_file_t *file)
{
data_writer_t *data = user;
(void)file;
if (block->flags & SQFS_BLK_FRAGMENT_BLOCK) {
data->stats.frag_blocks_written += 1;
} else {
data->stats.blocks_written += 1;
}
data->stats.bytes_written += block->size;
}
static void pre_fragment_store(void *user, sqfs_block_t *block)
{
data_writer_t *data = user;
(void)block;
data->stats.frag_count += 1;
}
static void notify_blocks_erased(void *user, size_t count, uint64_t bytes)
{
data_writer_t *data = user;
(void)bytes;
data->stats.bytes_written -= bytes;
data->stats.blocks_written -= count;
data->stats.duplicate_blocks += count;
}
static void notify_fragment_discard(void *user, const sqfs_block_t *block)
{
data_writer_t *data = user;
(void)block;
data->stats.frag_dup += 1;
}
static const sqfs_block_hooks_t hooks = {
.post_block_write = post_block_write,
.pre_fragment_store = pre_fragment_store,
.notify_blocks_erased = notify_blocks_erased,
.notify_fragment_discard = notify_fragment_discard,
};
static bool is_zero_block(unsigned char *ptr, size_t size)
{
return ptr[0] == 0 && memcmp(ptr, ptr + 1, size - 1) == 0;
}
static int add_sentinel_block(data_writer_t *data, sqfs_inode_generic_t *inode,
uint32_t flags)
{
sqfs_block_t *blk = calloc(1, sizeof(*blk));
if (blk == NULL) {
perror("creating sentinel block");
return -1;
}
blk->inode = inode;
blk->flags = flags;
return sqfs_data_writer_enqueue(data->proc, blk);
}
int write_data_from_file(data_writer_t *data, sqfs_inode_generic_t *inode,
sqfs_file_t *file, int flags)
{
uint32_t blk_flags = SQFS_BLK_FIRST_BLOCK;
uint64_t filesz, offset;
size_t diff, i = 0;
sqfs_block_t *blk;
int ret;
if (flags & DW_DONT_COMPRESS)
blk_flags |= SQFS_BLK_DONT_COMPRESS;
if (flags & DW_ALLIGN_DEVBLK)
blk_flags |= SQFS_BLK_ALLIGN;
sqfs_inode_get_file_size(inode, &filesz);
for (offset = 0; offset < filesz; offset += diff) {
if (filesz - offset > (uint64_t)data->super->block_size) {
diff = data->super->block_size;
} else {
diff = filesz - offset;
}
ret = sqfs_file_create_block(file, offset, diff, inode,
blk_flags, &blk);
if (ret)
return -1;
blk->index = i++;
if (is_zero_block(blk->data, blk->size)) {
data->stats.sparse_blocks += 1;
sqfs_inode_make_extended(inode);
inode->data.file_ext.sparse += blk->size;
inode->num_file_blocks += 1;
inode->block_sizes[blk->index] = 0;
free(blk);
continue;
}
if (diff < data->super->block_size &&
!(flags & DW_DONT_FRAGMENT)) {
if (!(blk_flags & (SQFS_BLK_FIRST_BLOCK |
SQFS_BLK_LAST_BLOCK))) {
blk_flags |= SQFS_BLK_LAST_BLOCK;
if (add_sentinel_block(data, inode,
blk_flags)) {
free(blk);
return -1;
}
}
blk->flags |= SQFS_BLK_IS_FRAGMENT;
if (sqfs_data_writer_enqueue(data->proc, blk))
return -1;
} else {
if (sqfs_data_writer_enqueue(data->proc, blk))
return -1;
blk_flags &= ~SQFS_BLK_FIRST_BLOCK;
inode->num_file_blocks += 1;
}
}
if (!(blk_flags & (SQFS_BLK_FIRST_BLOCK | SQFS_BLK_LAST_BLOCK))) {
blk_flags |= SQFS_BLK_LAST_BLOCK;
if (add_sentinel_block(data, inode, blk_flags))
return -1;
}
sqfs_inode_make_basic(inode);
data->stats.bytes_read += filesz;
data->stats.file_count += 1;
return 0;
}
data_writer_t *data_writer_create(sqfs_super_t *super, sqfs_compressor_t *cmp,
sqfs_file_t *file, size_t devblksize,
unsigned int num_jobs, size_t max_backlog)
{
data_writer_t *data = calloc(1, sizeof(*data));
if (data == NULL) {
perror("creating data writer");
return NULL;
}
data->proc = sqfs_data_writer_create(super->block_size, cmp,
num_jobs, max_backlog,
devblksize, file);
if (data->proc == NULL) {
perror("creating data block processor");
free(data);
return NULL;
}
sqfs_data_writer_set_hooks(data->proc, data, &hooks);
data->cmp = cmp;
data->super = super;
return data;
}
void data_writer_destroy(data_writer_t *data)
{
sqfs_data_writer_destroy(data->proc);
free(data);
}
int data_writer_write_fragment_table(data_writer_t *data)
{
if (sqfs_data_writer_write_fragment_table(data->proc, data->super)) {
fputs("error storing fragment table\n", stderr);
return -1;
}
return 0;
}
int data_writer_sync(data_writer_t *data)
{
return sqfs_data_writer_finish(data->proc);
}
data_writer_stats_t *data_writer_get_stats(data_writer_t *data)
{
return &data->stats;
}
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