| Current Path : /usr/src/contrib/libarchive/libarchive/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/contrib/libarchive/libarchive/archive_write_set_compression_xz.c |
/*-
* Copyright (c) 2009 Michihiro NAKAJIMA
* Copyright (c) 2003-2007 Tim Kientzle
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "archive_platform.h"
__FBSDID("$FreeBSD: release/9.1.0/contrib/libarchive/libarchive/archive_write_set_compression_xz.c 229592 2012-01-05 12:06:54Z mm $");
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <time.h>
#ifdef HAVE_LZMA_H
#include <lzma.h>
#endif
#include "archive.h"
#include "archive_private.h"
#include "archive_write_private.h"
#ifndef HAVE_LZMA_H
int
archive_write_set_compression_xz(struct archive *a)
{
archive_set_error(a, ARCHIVE_ERRNO_MISC,
"xz compression not supported on this platform");
return (ARCHIVE_FATAL);
}
int
archive_write_set_compression_lzma(struct archive *a)
{
archive_set_error(a, ARCHIVE_ERRNO_MISC,
"lzma compression not supported on this platform");
return (ARCHIVE_FATAL);
}
#else
/* Don't compile this if we don't have liblzma. */
struct private_data {
lzma_stream stream;
lzma_filter lzmafilters[2];
lzma_options_lzma lzma_opt;
int64_t total_in;
unsigned char *compressed;
size_t compressed_buffer_size;
};
struct private_config {
int compression_level;
};
static int archive_compressor_xz_init(struct archive_write *);
static int archive_compressor_xz_options(struct archive_write *,
const char *, const char *);
static int archive_compressor_xz_finish(struct archive_write *);
static int archive_compressor_xz_write(struct archive_write *,
const void *, size_t);
static int drive_compressor(struct archive_write *, struct private_data *,
int finishing);
/*
* Allocate, initialize and return a archive object.
*/
int
archive_write_set_compression_xz(struct archive *_a)
{
struct private_config *config;
struct archive_write *a = (struct archive_write *)_a;
__archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
ARCHIVE_STATE_NEW, "archive_write_set_compression_xz");
config = calloc(1, sizeof(*config));
if (config == NULL) {
archive_set_error(&a->archive, ENOMEM, "Out of memory");
return (ARCHIVE_FATAL);
}
a->compressor.config = config;
a->compressor.finish = archive_compressor_xz_finish;
config->compression_level = LZMA_PRESET_DEFAULT;
a->compressor.init = &archive_compressor_xz_init;
a->compressor.options = &archive_compressor_xz_options;
a->archive.compression_code = ARCHIVE_COMPRESSION_XZ;
a->archive.compression_name = "xz";
return (ARCHIVE_OK);
}
/* LZMA is handled identically, we just need a different compression
* code set. (The liblzma setup looks at the code to determine
* the one place that XZ and LZMA require different handling.) */
int
archive_write_set_compression_lzma(struct archive *_a)
{
struct archive_write *a = (struct archive_write *)_a;
int r = archive_write_set_compression_xz(_a);
if (r != ARCHIVE_OK)
return (r);
a->archive.compression_code = ARCHIVE_COMPRESSION_LZMA;
a->archive.compression_name = "lzma";
return (ARCHIVE_OK);
}
static int
archive_compressor_xz_init_stream(struct archive_write *a,
struct private_data *state)
{
static const lzma_stream lzma_stream_init_data = LZMA_STREAM_INIT;
int ret;
state->stream = lzma_stream_init_data;
state->stream.next_out = state->compressed;
state->stream.avail_out = state->compressed_buffer_size;
if (a->archive.compression_code == ARCHIVE_COMPRESSION_XZ)
ret = lzma_stream_encoder(&(state->stream),
state->lzmafilters, LZMA_CHECK_CRC64);
else
ret = lzma_alone_encoder(&(state->stream), &state->lzma_opt);
if (ret == LZMA_OK)
return (ARCHIVE_OK);
switch (ret) {
case LZMA_MEM_ERROR:
archive_set_error(&a->archive, ENOMEM,
"Internal error initializing compression library: "
"Cannot allocate memory");
break;
default:
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Internal error initializing compression library: "
"It's a bug in liblzma");
break;
}
return (ARCHIVE_FATAL);
}
/*
* Setup callback.
*/
static int
archive_compressor_xz_init(struct archive_write *a)
{
int ret;
struct private_data *state;
struct private_config *config;
if (a->client_opener != NULL) {
ret = (a->client_opener)(&a->archive, a->client_data);
if (ret != ARCHIVE_OK)
return (ret);
}
state = (struct private_data *)malloc(sizeof(*state));
if (state == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate data for compression");
return (ARCHIVE_FATAL);
}
memset(state, 0, sizeof(*state));
config = a->compressor.config;
/*
* See comment above. We should set compressed_buffer_size to
* max(bytes_per_block, 65536), but the code can't handle that yet.
*/
state->compressed_buffer_size = a->bytes_per_block;
state->compressed = (unsigned char *)malloc(state->compressed_buffer_size);
if (state->compressed == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate data for compression buffer");
free(state);
return (ARCHIVE_FATAL);
}
a->compressor.write = archive_compressor_xz_write;
/* Initialize compression library. */
if (lzma_lzma_preset(&state->lzma_opt, config->compression_level)) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Internal error initializing compression library");
free(state->compressed);
free(state);
}
state->lzmafilters[0].id = LZMA_FILTER_LZMA2;
state->lzmafilters[0].options = &state->lzma_opt;
state->lzmafilters[1].id = LZMA_VLI_UNKNOWN;/* Terminate */
ret = archive_compressor_xz_init_stream(a, state);
if (ret == LZMA_OK) {
a->compressor.data = state;
return (0);
}
/* Library setup failed: clean up. */
free(state->compressed);
free(state);
return (ARCHIVE_FATAL);
}
/*
* Set write options.
*/
static int
archive_compressor_xz_options(struct archive_write *a, const char *key,
const char *value)
{
struct private_config *config;
config = (struct private_config *)a->compressor.config;
if (strcmp(key, "compression-level") == 0) {
if (value == NULL || !(value[0] >= '0' && value[0] <= '9') ||
value[1] != '\0')
return (ARCHIVE_WARN);
config->compression_level = value[0] - '0';
if (config->compression_level > 6)
config->compression_level = 6;
return (ARCHIVE_OK);
}
return (ARCHIVE_WARN);
}
/*
* Write data to the compressed stream.
*/
static int
archive_compressor_xz_write(struct archive_write *a, const void *buff,
size_t length)
{
struct private_data *state;
int ret;
state = (struct private_data *)a->compressor.data;
if (a->client_writer == NULL) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_PROGRAMMER,
"No write callback is registered? "
"This is probably an internal programming error.");
return (ARCHIVE_FATAL);
}
/* Update statistics */
state->total_in += length;
/* Compress input data to output buffer */
state->stream.next_in = buff;
state->stream.avail_in = length;
if ((ret = drive_compressor(a, state, 0)) != ARCHIVE_OK)
return (ret);
a->archive.file_position += length;
return (ARCHIVE_OK);
}
/*
* Finish the compression...
*/
static int
archive_compressor_xz_finish(struct archive_write *a)
{
ssize_t block_length, target_block_length, bytes_written;
int ret;
struct private_data *state;
unsigned tocopy;
ret = ARCHIVE_OK;
state = (struct private_data *)a->compressor.data;
if (state != NULL) {
if (a->client_writer == NULL) {
archive_set_error(&a->archive,
ARCHIVE_ERRNO_PROGRAMMER,
"No write callback is registered? "
"This is probably an internal programming error.");
ret = ARCHIVE_FATAL;
goto cleanup;
}
/* By default, always pad the uncompressed data. */
if (a->pad_uncompressed) {
tocopy = a->bytes_per_block -
(state->total_in % a->bytes_per_block);
while (tocopy > 0 && tocopy < (unsigned)a->bytes_per_block) {
state->stream.next_in = a->nulls;
state->stream.avail_in = tocopy < a->null_length ?
tocopy : a->null_length;
state->total_in += state->stream.avail_in;
tocopy -= state->stream.avail_in;
ret = drive_compressor(a, state, 0);
if (ret != ARCHIVE_OK)
goto cleanup;
}
}
/* Finish compression cycle */
if (((ret = drive_compressor(a, state, 1))) != ARCHIVE_OK)
goto cleanup;
/* Optionally, pad the final compressed block. */
block_length = state->stream.next_out - state->compressed;
/* Tricky calculation to determine size of last block. */
if (a->bytes_in_last_block <= 0)
/* Default or Zero: pad to full block */
target_block_length = a->bytes_per_block;
else
/* Round length to next multiple of bytes_in_last_block. */
target_block_length = a->bytes_in_last_block *
( (block_length + a->bytes_in_last_block - 1) /
a->bytes_in_last_block);
if (target_block_length > a->bytes_per_block)
target_block_length = a->bytes_per_block;
if (block_length < target_block_length) {
memset(state->stream.next_out, 0,
target_block_length - block_length);
block_length = target_block_length;
}
/* Write the last block */
bytes_written = (a->client_writer)(&a->archive, a->client_data,
state->compressed, block_length);
if (bytes_written <= 0) {
ret = ARCHIVE_FATAL;
goto cleanup;
}
a->archive.raw_position += bytes_written;
/* Cleanup: shut down compressor, release memory, etc. */
cleanup:
lzma_end(&(state->stream));
free(state->compressed);
free(state);
}
free(a->compressor.config);
a->compressor.config = NULL;
return (ret);
}
/*
* Utility function to push input data through compressor,
* writing full output blocks as necessary.
*
* Note that this handles both the regular write case (finishing ==
* false) and the end-of-archive case (finishing == true).
*/
static int
drive_compressor(struct archive_write *a, struct private_data *state, int finishing)
{
ssize_t bytes_written;
int ret;
for (;;) {
if (state->stream.avail_out == 0) {
bytes_written = (a->client_writer)(&a->archive,
a->client_data, state->compressed,
state->compressed_buffer_size);
if (bytes_written <= 0) {
/* TODO: Handle this write failure */
return (ARCHIVE_FATAL);
} else if ((size_t)bytes_written < state->compressed_buffer_size) {
/* Short write: Move remaining to
* front of block and keep filling */
memmove(state->compressed,
state->compressed + bytes_written,
state->compressed_buffer_size - bytes_written);
}
a->archive.raw_position += bytes_written;
state->stream.next_out
= state->compressed +
state->compressed_buffer_size - bytes_written;
state->stream.avail_out = bytes_written;
}
/* If there's nothing to do, we're done. */
if (!finishing && state->stream.avail_in == 0)
return (ARCHIVE_OK);
ret = lzma_code(&(state->stream),
finishing ? LZMA_FINISH : LZMA_RUN );
switch (ret) {
case LZMA_OK:
/* In non-finishing case, check if compressor
* consumed everything */
if (!finishing && state->stream.avail_in == 0)
return (ARCHIVE_OK);
/* In finishing case, this return always means
* there's more work */
break;
case LZMA_STREAM_END:
/* This return can only occur in finishing case. */
if (finishing)
return (ARCHIVE_OK);
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"lzma compression data error");
return (ARCHIVE_FATAL);
case LZMA_MEMLIMIT_ERROR:
archive_set_error(&a->archive, ENOMEM,
"lzma compression error: "
"%ju MiB would have been needed",
(uintmax_t)((lzma_memusage(&(state->stream)) + 1024 * 1024 -1)
/ (1024 * 1024)));
return (ARCHIVE_FATAL);
default:
/* Any other return value indicates an error. */
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"lzma compression failed:"
" lzma_code() call returned status %d",
ret);
return (ARCHIVE_FATAL);
}
}
}
#endif /* HAVE_LZMA_H */