mirror of
https://git.openwrt.org/project/make_ext4fs.git
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Import libsparse sources
Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
This commit is contained in:
Jo-Philipp Wich
766
libsparse/output_file.c
Normal file
766
libsparse/output_file.c
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@@ -0,0 +1,766 @@
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/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define _FILE_OFFSET_BITS 64
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#define _LARGEFILE64_SOURCE 1
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#include <fcntl.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <zlib.h>
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#include "defs.h"
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#include "output_file.h"
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#include "sparse_crc32.h"
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#include "sparse_format.h"
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#ifndef USE_MINGW
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#include <sys/mman.h>
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#define O_BINARY 0
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#else
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#define ftruncate64 ftruncate
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#endif
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#if defined(__APPLE__) && defined(__MACH__)
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#define lseek64 lseek
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#define ftruncate64 ftruncate
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#define mmap64 mmap
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#define off64_t off_t
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#endif
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#define min(a, b) \
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({ typeof(a) _a = (a); typeof(b) _b = (b); (_a < _b) ? _a : _b; })
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#define SPARSE_HEADER_MAJOR_VER 1
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#define SPARSE_HEADER_MINOR_VER 0
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#define SPARSE_HEADER_LEN (sizeof(sparse_header_t))
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#define CHUNK_HEADER_LEN (sizeof(chunk_header_t))
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#define container_of(inner, outer_t, elem) \
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((outer_t *)((char *)inner - offsetof(outer_t, elem)))
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struct output_file_ops {
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int (*open)(struct output_file *, int fd);
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int (*skip)(struct output_file *, int64_t);
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int (*pad)(struct output_file *, int64_t);
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int (*write)(struct output_file *, void *, int);
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void (*close)(struct output_file *);
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};
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struct sparse_file_ops {
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int (*write_data_chunk)(struct output_file *out, unsigned int len,
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void *data);
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int (*write_fill_chunk)(struct output_file *out, unsigned int len,
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uint32_t fill_val);
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int (*write_skip_chunk)(struct output_file *out, int64_t len);
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int (*write_end_chunk)(struct output_file *out);
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};
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struct output_file {
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int64_t cur_out_ptr;
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unsigned int chunk_cnt;
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uint32_t crc32;
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struct output_file_ops *ops;
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struct sparse_file_ops *sparse_ops;
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int use_crc;
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unsigned int block_size;
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int64_t len;
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char *zero_buf;
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uint32_t *fill_buf;
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char *buf;
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};
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struct output_file_gz {
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struct output_file out;
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gzFile gz_fd;
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};
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#define to_output_file_gz(_o) \
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container_of((_o), struct output_file_gz, out)
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struct output_file_normal {
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struct output_file out;
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int fd;
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};
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#define to_output_file_normal(_o) \
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container_of((_o), struct output_file_normal, out)
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struct output_file_callback {
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struct output_file out;
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void *priv;
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int (*write)(void *priv, const void *buf, int len);
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};
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#define to_output_file_callback(_o) \
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container_of((_o), struct output_file_callback, out)
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static int file_open(struct output_file *out, int fd)
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{
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struct output_file_normal *outn = to_output_file_normal(out);
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outn->fd = fd;
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return 0;
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}
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static int file_skip(struct output_file *out, int64_t cnt)
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{
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off64_t ret;
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struct output_file_normal *outn = to_output_file_normal(out);
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ret = lseek64(outn->fd, cnt, SEEK_CUR);
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if (ret < 0) {
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error_errno("lseek64");
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return -1;
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}
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return 0;
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}
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static int file_pad(struct output_file *out, int64_t len)
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{
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int ret;
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struct output_file_normal *outn = to_output_file_normal(out);
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ret = ftruncate64(outn->fd, len);
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if (ret < 0) {
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return -errno;
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}
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return 0;
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}
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static int file_write(struct output_file *out, void *data, int len)
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{
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int ret;
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struct output_file_normal *outn = to_output_file_normal(out);
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ret = write(outn->fd, data, len);
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if (ret < 0) {
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error_errno("write");
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return -1;
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} else if (ret < len) {
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error("incomplete write");
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return -1;
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}
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return 0;
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}
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static void file_close(struct output_file *out)
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{
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struct output_file_normal *outn = to_output_file_normal(out);
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free(outn);
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}
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static struct output_file_ops file_ops = {
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.open = file_open,
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.skip = file_skip,
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.pad = file_pad,
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.write = file_write,
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.close = file_close,
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};
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static int gz_file_open(struct output_file *out, int fd)
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{
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struct output_file_gz *outgz = to_output_file_gz(out);
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outgz->gz_fd = gzdopen(fd, "wb9");
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if (!outgz->gz_fd) {
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error_errno("gzopen");
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return -errno;
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}
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return 0;
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}
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static int gz_file_skip(struct output_file *out, int64_t cnt)
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{
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off64_t ret;
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struct output_file_gz *outgz = to_output_file_gz(out);
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ret = gzseek(outgz->gz_fd, cnt, SEEK_CUR);
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if (ret < 0) {
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error_errno("gzseek");
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return -1;
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}
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return 0;
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}
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static int gz_file_pad(struct output_file *out, int64_t len)
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{
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off64_t ret;
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struct output_file_gz *outgz = to_output_file_gz(out);
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ret = gztell(outgz->gz_fd);
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if (ret < 0) {
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return -1;
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}
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if (ret >= len) {
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return 0;
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}
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ret = gzseek(outgz->gz_fd, len - 1, SEEK_SET);
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if (ret < 0) {
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return -1;
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}
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gzwrite(outgz->gz_fd, "", 1);
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return 0;
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}
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static int gz_file_write(struct output_file *out, void *data, int len)
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{
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int ret;
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struct output_file_gz *outgz = to_output_file_gz(out);
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ret = gzwrite(outgz->gz_fd, data, len);
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if (ret < 0) {
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error_errno("gzwrite");
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return -1;
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} else if (ret < len) {
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error("incomplete gzwrite");
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return -1;
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}
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return 0;
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}
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static void gz_file_close(struct output_file *out)
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{
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struct output_file_gz *outgz = to_output_file_gz(out);
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gzclose(outgz->gz_fd);
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free(outgz);
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}
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static struct output_file_ops gz_file_ops = {
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.open = gz_file_open,
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.skip = gz_file_skip,
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.pad = gz_file_pad,
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.write = gz_file_write,
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.close = gz_file_close,
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};
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static int callback_file_open(struct output_file *out __unused, int fd __unused)
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{
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return 0;
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}
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static int callback_file_skip(struct output_file *out, int64_t off)
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{
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struct output_file_callback *outc = to_output_file_callback(out);
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int to_write;
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int ret;
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while (off > 0) {
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to_write = min(off, (int64_t)INT_MAX);
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ret = outc->write(outc->priv, NULL, to_write);
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if (ret < 0) {
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return ret;
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}
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off -= to_write;
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}
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return 0;
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}
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static int callback_file_pad(struct output_file *out __unused, int64_t len __unused)
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{
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return -1;
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}
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static int callback_file_write(struct output_file *out, void *data, int len)
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{
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struct output_file_callback *outc = to_output_file_callback(out);
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return outc->write(outc->priv, data, len);
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}
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static void callback_file_close(struct output_file *out)
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{
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struct output_file_callback *outc = to_output_file_callback(out);
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free(outc);
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}
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static struct output_file_ops callback_file_ops = {
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.open = callback_file_open,
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.skip = callback_file_skip,
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.pad = callback_file_pad,
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.write = callback_file_write,
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.close = callback_file_close,
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};
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int read_all(int fd, void *buf, size_t len)
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{
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size_t total = 0;
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int ret;
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char *ptr = buf;
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while (total < len) {
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ret = read(fd, ptr, len - total);
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if (ret < 0)
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return -errno;
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if (ret == 0)
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return -EINVAL;
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ptr += ret;
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total += ret;
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}
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return 0;
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}
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static int write_sparse_skip_chunk(struct output_file *out, int64_t skip_len)
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{
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chunk_header_t chunk_header;
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int ret;
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if (skip_len % out->block_size) {
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error("don't care size %"PRIi64" is not a multiple of the block size %u",
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skip_len, out->block_size);
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return -1;
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}
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/* We are skipping data, so emit a don't care chunk. */
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chunk_header.chunk_type = CHUNK_TYPE_DONT_CARE;
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chunk_header.reserved1 = 0;
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chunk_header.chunk_sz = skip_len / out->block_size;
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chunk_header.total_sz = CHUNK_HEADER_LEN;
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ret = out->ops->write(out, &chunk_header, sizeof(chunk_header));
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if (ret < 0)
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return -1;
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out->cur_out_ptr += skip_len;
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out->chunk_cnt++;
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return 0;
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}
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static int write_sparse_fill_chunk(struct output_file *out, unsigned int len,
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uint32_t fill_val)
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{
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chunk_header_t chunk_header;
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int rnd_up_len, count;
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int ret;
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/* Round up the fill length to a multiple of the block size */
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rnd_up_len = ALIGN(len, out->block_size);
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/* Finally we can safely emit a chunk of data */
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chunk_header.chunk_type = CHUNK_TYPE_FILL;
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chunk_header.reserved1 = 0;
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chunk_header.chunk_sz = rnd_up_len / out->block_size;
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chunk_header.total_sz = CHUNK_HEADER_LEN + sizeof(fill_val);
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ret = out->ops->write(out, &chunk_header, sizeof(chunk_header));
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if (ret < 0)
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return -1;
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ret = out->ops->write(out, &fill_val, sizeof(fill_val));
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if (ret < 0)
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return -1;
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if (out->use_crc) {
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count = out->block_size / sizeof(uint32_t);
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while (count--)
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out->crc32 = sparse_crc32(out->crc32, &fill_val, sizeof(uint32_t));
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}
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out->cur_out_ptr += rnd_up_len;
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out->chunk_cnt++;
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return 0;
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}
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static int write_sparse_data_chunk(struct output_file *out, unsigned int len,
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void *data)
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{
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chunk_header_t chunk_header;
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int rnd_up_len, zero_len;
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int ret;
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/* Round up the data length to a multiple of the block size */
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rnd_up_len = ALIGN(len, out->block_size);
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zero_len = rnd_up_len - len;
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/* Finally we can safely emit a chunk of data */
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chunk_header.chunk_type = CHUNK_TYPE_RAW;
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chunk_header.reserved1 = 0;
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chunk_header.chunk_sz = rnd_up_len / out->block_size;
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chunk_header.total_sz = CHUNK_HEADER_LEN + rnd_up_len;
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ret = out->ops->write(out, &chunk_header, sizeof(chunk_header));
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if (ret < 0)
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return -1;
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ret = out->ops->write(out, data, len);
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if (ret < 0)
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return -1;
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if (zero_len) {
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ret = out->ops->write(out, out->zero_buf, zero_len);
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if (ret < 0)
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return -1;
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}
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if (out->use_crc) {
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out->crc32 = sparse_crc32(out->crc32, data, len);
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if (zero_len)
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out->crc32 = sparse_crc32(out->crc32, out->zero_buf, zero_len);
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}
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out->cur_out_ptr += rnd_up_len;
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out->chunk_cnt++;
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return 0;
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}
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int write_sparse_end_chunk(struct output_file *out)
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{
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chunk_header_t chunk_header;
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int ret;
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if (out->use_crc) {
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chunk_header.chunk_type = CHUNK_TYPE_CRC32;
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chunk_header.reserved1 = 0;
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chunk_header.chunk_sz = 0;
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chunk_header.total_sz = CHUNK_HEADER_LEN + 4;
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ret = out->ops->write(out, &chunk_header, sizeof(chunk_header));
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if (ret < 0) {
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return ret;
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}
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out->ops->write(out, &out->crc32, 4);
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if (ret < 0) {
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return ret;
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}
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|
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out->chunk_cnt++;
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}
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return 0;
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||||
}
|
||||
|
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static struct sparse_file_ops sparse_file_ops = {
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||||
.write_data_chunk = write_sparse_data_chunk,
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||||
.write_fill_chunk = write_sparse_fill_chunk,
|
||||
.write_skip_chunk = write_sparse_skip_chunk,
|
||||
.write_end_chunk = write_sparse_end_chunk,
|
||||
};
|
||||
|
||||
static int write_normal_data_chunk(struct output_file *out, unsigned int len,
|
||||
void *data)
|
||||
{
|
||||
int ret;
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||||
unsigned int rnd_up_len = ALIGN(len, out->block_size);
|
||||
|
||||
ret = out->ops->write(out, data, len);
|
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if (ret < 0) {
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return ret;
|
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}
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|
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if (rnd_up_len > len) {
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||||
ret = out->ops->skip(out, rnd_up_len - len);
|
||||
}
|
||||
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return ret;
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||||
}
|
||||
|
||||
static int write_normal_fill_chunk(struct output_file *out, unsigned int len,
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||||
uint32_t fill_val)
|
||||
{
|
||||
int ret;
|
||||
unsigned int i;
|
||||
unsigned int write_len;
|
||||
|
||||
/* Initialize fill_buf with the fill_val */
|
||||
for (i = 0; i < out->block_size / sizeof(uint32_t); i++) {
|
||||
out->fill_buf[i] = fill_val;
|
||||
}
|
||||
|
||||
while (len) {
|
||||
write_len = min(len, out->block_size);
|
||||
ret = out->ops->write(out, out->fill_buf, write_len);
|
||||
if (ret < 0) {
|
||||
return ret;
|
||||
}
|
||||
|
||||
len -= write_len;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int write_normal_skip_chunk(struct output_file *out, int64_t len)
|
||||
{
|
||||
return out->ops->skip(out, len);
|
||||
}
|
||||
|
||||
int write_normal_end_chunk(struct output_file *out)
|
||||
{
|
||||
return out->ops->pad(out, out->len);
|
||||
}
|
||||
|
||||
static struct sparse_file_ops normal_file_ops = {
|
||||
.write_data_chunk = write_normal_data_chunk,
|
||||
.write_fill_chunk = write_normal_fill_chunk,
|
||||
.write_skip_chunk = write_normal_skip_chunk,
|
||||
.write_end_chunk = write_normal_end_chunk,
|
||||
};
|
||||
|
||||
void output_file_close(struct output_file *out)
|
||||
{
|
||||
out->sparse_ops->write_end_chunk(out);
|
||||
out->ops->close(out);
|
||||
}
|
||||
|
||||
static int output_file_init(struct output_file *out, int block_size,
|
||||
int64_t len, bool sparse, int chunks, bool crc)
|
||||
{
|
||||
int ret;
|
||||
|
||||
out->len = len;
|
||||
out->block_size = block_size;
|
||||
out->cur_out_ptr = 0ll;
|
||||
out->chunk_cnt = 0;
|
||||
out->crc32 = 0;
|
||||
out->use_crc = crc;
|
||||
|
||||
out->zero_buf = calloc(block_size, 1);
|
||||
if (!out->zero_buf) {
|
||||
error_errno("malloc zero_buf");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
out->fill_buf = calloc(block_size, 1);
|
||||
if (!out->fill_buf) {
|
||||
error_errno("malloc fill_buf");
|
||||
ret = -ENOMEM;
|
||||
goto err_fill_buf;
|
||||
}
|
||||
|
||||
if (sparse) {
|
||||
out->sparse_ops = &sparse_file_ops;
|
||||
} else {
|
||||
out->sparse_ops = &normal_file_ops;
|
||||
}
|
||||
|
||||
if (sparse) {
|
||||
sparse_header_t sparse_header = {
|
||||
.magic = SPARSE_HEADER_MAGIC,
|
||||
.major_version = SPARSE_HEADER_MAJOR_VER,
|
||||
.minor_version = SPARSE_HEADER_MINOR_VER,
|
||||
.file_hdr_sz = SPARSE_HEADER_LEN,
|
||||
.chunk_hdr_sz = CHUNK_HEADER_LEN,
|
||||
.blk_sz = out->block_size,
|
||||
.total_blks = out->len / out->block_size,
|
||||
.total_chunks = chunks,
|
||||
.image_checksum = 0
|
||||
};
|
||||
|
||||
if (out->use_crc) {
|
||||
sparse_header.total_chunks++;
|
||||
}
|
||||
|
||||
ret = out->ops->write(out, &sparse_header, sizeof(sparse_header));
|
||||
if (ret < 0) {
|
||||
goto err_write;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
err_write:
|
||||
free(out->fill_buf);
|
||||
err_fill_buf:
|
||||
free(out->zero_buf);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static struct output_file *output_file_new_gz(void)
|
||||
{
|
||||
struct output_file_gz *outgz = calloc(1, sizeof(struct output_file_gz));
|
||||
if (!outgz) {
|
||||
error_errno("malloc struct outgz");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
outgz->out.ops = &gz_file_ops;
|
||||
|
||||
return &outgz->out;
|
||||
}
|
||||
|
||||
static struct output_file *output_file_new_normal(void)
|
||||
{
|
||||
struct output_file_normal *outn = calloc(1, sizeof(struct output_file_normal));
|
||||
if (!outn) {
|
||||
error_errno("malloc struct outn");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
outn->out.ops = &file_ops;
|
||||
|
||||
return &outn->out;
|
||||
}
|
||||
|
||||
struct output_file *output_file_open_callback(int (*write)(void *, const void *, int),
|
||||
void *priv, unsigned int block_size, int64_t len,
|
||||
int gz __unused, int sparse, int chunks, int crc)
|
||||
{
|
||||
int ret;
|
||||
struct output_file_callback *outc;
|
||||
|
||||
outc = calloc(1, sizeof(struct output_file_callback));
|
||||
if (!outc) {
|
||||
error_errno("malloc struct outc");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
outc->out.ops = &callback_file_ops;
|
||||
outc->priv = priv;
|
||||
outc->write = write;
|
||||
|
||||
ret = output_file_init(&outc->out, block_size, len, sparse, chunks, crc);
|
||||
if (ret < 0) {
|
||||
free(outc);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return &outc->out;
|
||||
}
|
||||
|
||||
struct output_file *output_file_open_fd(int fd, unsigned int block_size, int64_t len,
|
||||
int gz, int sparse, int chunks, int crc)
|
||||
{
|
||||
int ret;
|
||||
struct output_file *out;
|
||||
|
||||
if (gz) {
|
||||
out = output_file_new_gz();
|
||||
} else {
|
||||
out = output_file_new_normal();
|
||||
}
|
||||
if (!out) {
|
||||
return NULL;
|
||||
}
|
||||
|
||||
out->ops->open(out, fd);
|
||||
|
||||
ret = output_file_init(out, block_size, len, sparse, chunks, crc);
|
||||
if (ret < 0) {
|
||||
free(out);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return out;
|
||||
}
|
||||
|
||||
/* Write a contiguous region of data blocks from a memory buffer */
|
||||
int write_data_chunk(struct output_file *out, unsigned int len, void *data)
|
||||
{
|
||||
return out->sparse_ops->write_data_chunk(out, len, data);
|
||||
}
|
||||
|
||||
/* Write a contiguous region of data blocks with a fill value */
|
||||
int write_fill_chunk(struct output_file *out, unsigned int len,
|
||||
uint32_t fill_val)
|
||||
{
|
||||
return out->sparse_ops->write_fill_chunk(out, len, fill_val);
|
||||
}
|
||||
|
||||
int write_fd_chunk(struct output_file *out, unsigned int len,
|
||||
int fd, int64_t offset)
|
||||
{
|
||||
int ret;
|
||||
int64_t aligned_offset;
|
||||
int aligned_diff;
|
||||
int buffer_size;
|
||||
char *ptr;
|
||||
|
||||
aligned_offset = offset & ~(4096 - 1);
|
||||
aligned_diff = offset - aligned_offset;
|
||||
buffer_size = len + aligned_diff;
|
||||
|
||||
#ifndef USE_MINGW
|
||||
char *data = mmap64(NULL, buffer_size, PROT_READ, MAP_SHARED, fd,
|
||||
aligned_offset);
|
||||
if (data == MAP_FAILED) {
|
||||
return -errno;
|
||||
}
|
||||
ptr = data + aligned_diff;
|
||||
#else
|
||||
off64_t pos;
|
||||
char *data = malloc(len);
|
||||
if (!data) {
|
||||
return -errno;
|
||||
}
|
||||
pos = lseek64(fd, offset, SEEK_SET);
|
||||
if (pos < 0) {
|
||||
free(data);
|
||||
return -errno;
|
||||
}
|
||||
ret = read_all(fd, data, len);
|
||||
if (ret < 0) {
|
||||
free(data);
|
||||
return ret;
|
||||
}
|
||||
ptr = data;
|
||||
#endif
|
||||
|
||||
ret = out->sparse_ops->write_data_chunk(out, len, ptr);
|
||||
|
||||
#ifndef USE_MINGW
|
||||
munmap(data, buffer_size);
|
||||
#else
|
||||
free(data);
|
||||
#endif
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Write a contiguous region of data blocks from a file */
|
||||
int write_file_chunk(struct output_file *out, unsigned int len,
|
||||
const char *file, int64_t offset)
|
||||
{
|
||||
int ret;
|
||||
|
||||
int file_fd = open(file, O_RDONLY | O_BINARY);
|
||||
if (file_fd < 0) {
|
||||
return -errno;
|
||||
}
|
||||
|
||||
ret = write_fd_chunk(out, len, file_fd, offset);
|
||||
|
||||
close(file_fd);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
int write_skip_chunk(struct output_file *out, int64_t len)
|
||||
{
|
||||
return out->sparse_ops->write_skip_chunk(out, len);
|
||||
}
|
||||
Reference in New Issue
Block a user