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-rw-r--r--lib/sqfs/data_writer.c528
1 files changed, 0 insertions, 528 deletions
diff --git a/lib/sqfs/data_writer.c b/lib/sqfs/data_writer.c
deleted file mode 100644
index d4b402b..0000000
--- a/lib/sqfs/data_writer.c
+++ /dev/null
@@ -1,528 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * data_writer.c
- *
- * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
- */
-#include "config.h"
-
-#include "block_processor.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 {
- block_t *frag_block;
- sqfs_fragment_t *fragments;
- size_t num_fragments;
- size_t max_fragments;
-
- size_t devblksz;
- uint64_t bytes_written;
- off_t start;
-
- block_processor_t *proc;
- compressor_t *cmp;
- file_info_t *list;
- sqfs_super_t *super;
- int outfd;
-};
-
-enum {
- BLK_FIRST_BLOCK = BLK_USER,
- BLK_LAST_BLOCK = BLK_USER << 1,
- BLK_ALLIGN = BLK_USER << 2,
- BLK_FRAGMENT_BLOCK = BLK_USER << 3,
-};
-
-static int save_position(data_writer_t *data)
-{
- data->bytes_written = data->super->bytes_used;
- data->start = lseek(data->outfd, 0, SEEK_CUR);
-
- if (data->start == (off_t)-1) {
- perror("querying current position on squashfs image");
- return -1;
- }
-
- return 0;
-}
-
-static int restore_position(data_writer_t *data)
-{
- if (lseek(data->outfd, data->start, SEEK_SET) == (off_t)-1)
- goto fail_seek;
-
- if (ftruncate(data->outfd, data->start))
- goto fail_truncate;
-
- data->super->bytes_used = data->bytes_written;
- return 0;
-fail_seek:
- perror("seeking on squashfs image after file deduplication");
- return -1;
-fail_truncate:
- perror("truncating squashfs image after file deduplication");
- return -1;
-}
-
-static int allign_file(data_writer_t *data)
-{
- size_t diff = data->super->bytes_used % data->devblksz;
-
- if (diff == 0)
- return 0;
-
- if (padd_file(data->outfd, data->super->bytes_used, data->devblksz))
- return -1;
-
- data->super->bytes_used += data->devblksz - diff;
- return 0;
-}
-
-static int block_callback(void *user, block_t *blk)
-{
- file_info_t *fi = blk->user;
- data_writer_t *data = user;
- uint64_t ref, offset;
- uint32_t out;
-
- if (blk->flags & BLK_FIRST_BLOCK) {
- if (save_position(data))
- return -1;
-
- if ((blk->flags & BLK_ALLIGN) && allign_file(data) != 0)
- return -1;
-
- fi->startblock = data->super->bytes_used;
- }
-
- if (blk->size == 0)
- goto skip_sentinel;
-
- out = blk->size;
- if (!(blk->flags & BLK_IS_COMPRESSED))
- out |= 1 << 24;
-
- if (blk->flags & BLK_FRAGMENT_BLOCK) {
- offset = htole64(data->super->bytes_used);
- data->fragments[blk->index].start_offset = offset;
- data->fragments[blk->index].pad0 = 0;
- data->fragments[blk->index].size = htole32(out);
-
- data->super->flags &= ~SQFS_FLAG_NO_FRAGMENTS;
- data->super->flags |= SQFS_FLAG_ALWAYS_FRAGMENTS;
- } else {
- fi->blocks[blk->index].chksum = blk->checksum;
- fi->blocks[blk->index].size = htole32(out);
- }
-
- if (write_data("writing data block", data->outfd,
- blk->data, blk->size)) {
- return -1;
- }
-
- data->super->bytes_used += blk->size;
-
-skip_sentinel:
- if (blk->flags & BLK_LAST_BLOCK) {
- if ((blk->flags & BLK_ALLIGN) && allign_file(data) != 0)
- return -1;
-
- ref = find_equal_blocks(fi, data->list,
- data->super->block_size);
- if (ref > 0) {
- fi->startblock = ref;
- fi->flags |= FILE_FLAG_BLOCKS_ARE_DUPLICATE;
-
- if (restore_position(data))
- return -1;
- }
- }
-
- return 0;
-}
-
-/*****************************************************************************/
-
-static int flush_fragment_block(data_writer_t *data)
-{
- size_t newsz;
- void *new;
- int ret;
-
- if (data->num_fragments == data->max_fragments) {
- newsz = data->max_fragments ? data->max_fragments * 2 : 16;
- new = realloc(data->fragments,
- sizeof(data->fragments[0]) * newsz);
-
- if (new == NULL) {
- perror("appending to fragment table");
- return -1;
- }
-
- data->max_fragments = newsz;
- data->fragments = new;
- }
-
- data->frag_block->index = data->num_fragments++;
-
- ret = block_processor_enqueue(data->proc, data->frag_block);
- data->frag_block = NULL;
- return ret;
-}
-
-static int store_fragment(data_writer_t *data, block_t *frag)
-{
- file_info_t *fi = frag->user;
- size_t size;
-
- if (data->frag_block != NULL) {
- size = data->frag_block->size + frag->size;
-
- if (size > data->super->block_size) {
- if (flush_fragment_block(data))
- goto fail;
- }
- }
-
- if (data->frag_block == NULL) {
- size = sizeof(block_t) + data->super->block_size;
-
- data->frag_block = calloc(1, size);
- if (data->frag_block == NULL) {
- perror("creating fragment block");
- goto fail;
- }
-
- data->frag_block->flags = BLK_DONT_CHECKSUM;
- data->frag_block->flags |= BLK_FRAGMENT_BLOCK;
- }
-
- fi->fragment_offset = data->frag_block->size;
- fi->fragment = data->num_fragments;
-
- data->frag_block->flags |= (frag->flags & BLK_DONT_COMPRESS);
- memcpy(data->frag_block->data + data->frag_block->size,
- frag->data, frag->size);
-
- data->frag_block->size += frag->size;
- free(frag);
- return 0;
-fail:
- free(frag);
- return -1;
-}
-
-static bool is_zero_block(unsigned char *ptr, size_t size)
-{
- return ptr[0] == 0 && memcmp(ptr, ptr + 1, size - 1) == 0;
-}
-
-static int handle_fragment(data_writer_t *data, block_t *blk)
-{
- file_info_t *fi = blk->user, *ref;
-
- fi->fragment_chksum = crc32(0, blk->data, blk->size);
-
- ref = fragment_by_chksum(fi, fi->fragment_chksum, blk->size,
- data->list, data->super->block_size);
-
- if (ref != NULL) {
- fi->fragment_offset = ref->fragment_offset;
- fi->fragment = ref->fragment;
- fi->flags |= FILE_FLAG_FRAGMENT_IS_DUPLICATE;
- free(blk);
- return 0;
- }
-
- return store_fragment(data, blk);
-}
-
-static int add_sentinel_block(data_writer_t *data, file_info_t *fi,
- uint32_t flags)
-{
- block_t *blk = calloc(1, sizeof(*blk));
-
- if (blk == NULL) {
- perror("creating sentinel block");
- return -1;
- }
-
- blk->user = fi;
- blk->flags = BLK_DONT_COMPRESS | BLK_DONT_CHECKSUM | flags;
-
- return block_processor_enqueue(data->proc, blk);
-}
-
-int write_data_from_fd(data_writer_t *data, file_info_t *fi,
- int infd, int flags)
-{
- uint32_t blk_flags = BLK_FIRST_BLOCK;
- uint64_t file_size = fi->size;
- size_t diff, i = 0;
- block_t *blk;
-
- if (flags & DW_DONT_COMPRESS)
- blk_flags |= BLK_DONT_COMPRESS;
-
- if (flags & DW_ALLIGN_DEVBLK)
- blk_flags |= BLK_ALLIGN;
-
- fi->next = data->list;
- data->list = fi;
-
- for (; file_size > 0; file_size -= diff) {
- if (file_size > data->super->block_size) {
- diff = data->super->block_size;
- } else {
- diff = file_size;
- }
-
- blk = create_block(fi->input_file, infd, diff, fi, blk_flags);
- if (blk == NULL)
- return -1;
-
- blk->index = i++;
-
- if (is_zero_block(blk->data, blk->size)) {
- fi->blocks[blk->index].chksum = 0;
- fi->blocks[blk->index].size = 0;
- free(blk);
- continue;
- }
-
- if (diff < data->super->block_size &&
- !(flags & DW_DONT_FRAGMENT)) {
- fi->flags |= FILE_FLAG_HAS_FRAGMENT;
-
- if (!(blk_flags & (BLK_FIRST_BLOCK | BLK_LAST_BLOCK))) {
- blk_flags |= BLK_LAST_BLOCK;
-
- if (add_sentinel_block(data, fi, blk_flags)) {
- free(blk);
- return -1;
- }
- }
-
- if (handle_fragment(data, blk))
- return -1;
- } else {
- if (block_processor_enqueue(data->proc, blk))
- return -1;
-
- blk_flags &= ~BLK_FIRST_BLOCK;
- }
- }
-
- if (!(blk_flags & (BLK_FIRST_BLOCK | BLK_LAST_BLOCK))) {
- blk_flags |= BLK_LAST_BLOCK;
-
- if (add_sentinel_block(data, fi, blk_flags))
- return -1;
- }
-
- return 0;
-}
-
-static int check_map_valid(const sparse_map_t *map, file_info_t *fi)
-{
- const sparse_map_t *m;
- uint64_t offset;
-
- if (map != NULL) {
- offset = map->offset;
-
- for (m = map; m != NULL; m = m->next) {
- if (m->offset < offset)
- goto fail_map;
- offset = m->offset + m->count;
- }
-
- if (offset > fi->size)
- goto fail_map_size;
- }
-
- return 0;
-fail_map_size:
- fprintf(stderr, "%s: sparse file map spans beyond file size\n",
- fi->input_file);
- return -1;
-fail_map:
- fprintf(stderr,
- "%s: sparse file map is unordered or self overlapping\n",
- fi->input_file);
- return -1;
-}
-
-static int get_sparse_block(block_t *blk, file_info_t *fi, int infd,
- sparse_map_t **sparse_map, uint64_t offset,
- size_t diff)
-{
- sparse_map_t *map = *sparse_map;
- size_t start, count;
-
- while (map != NULL && map->offset < offset + diff) {
- start = 0;
- count = map->count;
-
- if (map->offset < offset)
- count -= offset - map->offset;
-
- if (map->offset > offset)
- start = map->offset - offset;
-
- if (start + count > diff)
- count = diff - start;
-
- if (read_data(fi->input_file, infd, blk->data + start, count))
- return -1;
-
- map = map->next;
- }
-
- *sparse_map = map;
- return 0;
-}
-
-int write_data_from_fd_condensed(data_writer_t *data, file_info_t *fi,
- int infd, sparse_map_t *map, int flags)
-{
- uint32_t blk_flags = BLK_FIRST_BLOCK;
- size_t diff, i = 0;
- uint64_t offset;
- block_t *blk;
-
- if (check_map_valid(map, fi))
- return -1;
-
- if (flags & DW_DONT_COMPRESS)
- blk_flags |= BLK_DONT_COMPRESS;
-
- if (flags & DW_ALLIGN_DEVBLK)
- blk_flags |= BLK_ALLIGN;
-
- for (offset = 0; offset < fi->size; offset += diff) {
- if (fi->size - offset > (uint64_t)data->super->block_size) {
- diff = data->super->block_size;
- } else {
- diff = fi->size - offset;
- }
-
- blk = alloc_flex(sizeof(*blk), 1, diff);
- blk->size = diff;
- blk->index = i++;
- blk->user = fi;
- blk->flags = blk_flags;
-
- if (get_sparse_block(blk, fi, infd, &map, offset, diff)) {
- free(blk);
- return -1;
- }
-
- if (is_zero_block(blk->data, blk->size)) {
- fi->blocks[blk->index].chksum = 0;
- fi->blocks[blk->index].size = 0;
- free(blk);
- continue;
- }
-
- if (diff < data->super->block_size &&
- !(flags & DW_DONT_FRAGMENT)) {
- fi->flags |= FILE_FLAG_HAS_FRAGMENT;
-
- if (!(blk_flags & (BLK_FIRST_BLOCK | BLK_LAST_BLOCK))) {
- blk_flags |= BLK_LAST_BLOCK;
-
- if (add_sentinel_block(data, fi, blk_flags)) {
- free(blk);
- return -1;
- }
- }
-
- if (handle_fragment(data, blk))
- return -1;
- } else {
- if (block_processor_enqueue(data->proc, blk))
- return -1;
-
- blk_flags &= ~BLK_FIRST_BLOCK;
- }
- }
-
- if (!(blk_flags & (BLK_FIRST_BLOCK | BLK_LAST_BLOCK))) {
- blk_flags |= BLK_LAST_BLOCK;
-
- if (add_sentinel_block(data, fi, blk_flags))
- return -1;
- }
-
- return 0;
-}
-
-data_writer_t *data_writer_create(sqfs_super_t *super, compressor_t *cmp,
- int outfd, size_t devblksize,
- unsigned int num_jobs)
-{
- data_writer_t *data = calloc(1, sizeof(*data));
-
- if (data == NULL) {
- perror("creating data writer");
- return NULL;
- }
-
- data->proc = block_processor_create(super->block_size, cmp, num_jobs,
- data, block_callback);
- data->cmp = cmp;
- data->super = super;
- data->outfd = outfd;
- data->devblksz = devblksize;
- return data;
-}
-
-void data_writer_destroy(data_writer_t *data)
-{
- block_processor_destroy(data->proc);
- free(data->fragments);
- free(data);
-}
-
-int data_writer_write_fragment_table(data_writer_t *data)
-{
- uint64_t start;
- size_t size;
- int ret;
-
- if (data->num_fragments == 0) {
- data->super->fragment_entry_count = 0;
- data->super->fragment_table_start = 0xFFFFFFFFFFFFFFFFUL;
- return 0;
- }
-
- size = sizeof(data->fragments[0]) * data->num_fragments;
- ret = sqfs_write_table(data->outfd, data->super, data->cmp,
- data->fragments, size, &start);
- if (ret)
- return -1;
-
- data->super->fragment_entry_count = data->num_fragments;
- data->super->fragment_table_start = start;
- return 0;
-}
-
-int data_writer_sync(data_writer_t *data)
-{
- if (data->frag_block != NULL) {
- if (flush_fragment_block(data))
- return -1;
- }
-
- return block_processor_finish(data->proc);
-}