336 lines
9.4 KiB
C
336 lines
9.4 KiB
C
/*-
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* Copyright (c) 2003-2007 Tim Kientzle
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "archive_platform.h"
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__FBSDID("$FreeBSD: head/lib/libarchive/archive_write_set_compression_bzip2.c 201091 2009-12-28 02:22:41Z kientzle $");
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#include <stdio.h>
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_BZLIB_H
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#include <cm_bzlib.h>
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#endif
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#include "archive.h"
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#include "archive_private.h"
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#include "archive_write_private.h"
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#if ARCHIVE_VERSION_NUMBER < 4000000
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int
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archive_write_set_compression_bzip2(struct archive *a)
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{
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__archive_write_filters_free(a);
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return (archive_write_add_filter_bzip2(a));
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}
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#endif
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#if !defined(HAVE_BZLIB_H) || !defined(BZ_CONFIG_ERROR)
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int
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archive_write_add_filter_bzip2(struct archive *a)
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{
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archive_set_error(a, ARCHIVE_ERRNO_MISC,
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"bzip2 compression not supported on this platform");
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return (ARCHIVE_FATAL);
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}
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#else
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/* Don't compile this if we don't have bzlib. */
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struct private_data {
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int compression_level;
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bz_stream stream;
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int64_t total_in;
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char *compressed;
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size_t compressed_buffer_size;
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};
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/*
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* Yuck. bzlib.h is not const-correct, so I need this one bit
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* of ugly hackery to convert a const * pointer to a non-const pointer.
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*/
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#define SET_NEXT_IN(st,src) \
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(st)->stream.next_in = (char *)(uintptr_t)(const void *)(src)
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static int archive_compressor_bzip2_close(struct archive_write_filter *);
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static int archive_compressor_bzip2_free(struct archive_write_filter *);
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static int archive_compressor_bzip2_open(struct archive_write_filter *);
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static int archive_compressor_bzip2_options(struct archive_write_filter *,
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const char *, const char *);
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static int archive_compressor_bzip2_write(struct archive_write_filter *,
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const void *, size_t);
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static int drive_compressor(struct archive_write_filter *,
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struct private_data *, int finishing);
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/*
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* Add a bzip2 compression filter to this write handle.
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*/
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int
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archive_write_add_filter_bzip2(struct archive *_a)
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{
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struct archive_write *a = (struct archive_write *)_a;
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struct archive_write_filter *f = __archive_write_allocate_filter(_a);
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struct private_data *data;
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archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
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ARCHIVE_STATE_NEW, "archive_write_add_filter_bzip2");
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data = calloc(1, sizeof(*data));
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if (data == NULL) {
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archive_set_error(&a->archive, ENOMEM, "Out of memory");
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return (ARCHIVE_FATAL);
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}
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data->compression_level = 9; /* default */
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f->data = data;
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f->options = &archive_compressor_bzip2_options;
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f->close = &archive_compressor_bzip2_close;
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f->free = &archive_compressor_bzip2_free;
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f->open = &archive_compressor_bzip2_open;
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f->code = ARCHIVE_COMPRESSION_BZIP2;
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f->name = "bzip2";
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return (ARCHIVE_OK);
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}
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/*
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* Setup callback.
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*/
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static int
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archive_compressor_bzip2_open(struct archive_write_filter *f)
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{
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struct private_data *data = (struct private_data *)f->data;
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int ret;
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ret = __archive_write_open_filter(f->next_filter);
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if (ret != 0)
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return (ret);
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/* TODO: Find a better way to size this. (Maybe look at the */
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/* block size expected by the following filter?) */
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if (data->compressed == NULL) {
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data->compressed_buffer_size = 65536;
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data->compressed
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= (char *)malloc(data->compressed_buffer_size);
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if (data->compressed == NULL) {
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archive_set_error(f->archive, ENOMEM,
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"Can't allocate data for compression buffer");
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return (ARCHIVE_FATAL);
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}
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}
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memset(&data->stream, 0, sizeof(data->stream));
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data->stream.next_out = data->compressed;
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data->stream.avail_out = data->compressed_buffer_size;
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f->write = archive_compressor_bzip2_write;
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/* Initialize compression library */
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ret = BZ2_bzCompressInit(&(data->stream),
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data->compression_level, 0, 30);
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if (ret == BZ_OK) {
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f->data = data;
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return (ARCHIVE_OK);
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}
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/* Library setup failed: clean up. */
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archive_set_error(f->archive, ARCHIVE_ERRNO_MISC,
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"Internal error initializing compression library");
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/* Override the error message if we know what really went wrong. */
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switch (ret) {
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case BZ_PARAM_ERROR:
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archive_set_error(f->archive, ARCHIVE_ERRNO_MISC,
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"Internal error initializing compression library: "
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"invalid setup parameter");
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break;
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case BZ_MEM_ERROR:
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archive_set_error(f->archive, ENOMEM,
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"Internal error initializing compression library: "
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"out of memory");
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break;
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case BZ_CONFIG_ERROR:
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archive_set_error(f->archive, ARCHIVE_ERRNO_MISC,
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"Internal error initializing compression library: "
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"mis-compiled library");
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break;
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}
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return (ARCHIVE_FATAL);
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}
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/*
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* Set write options.
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*/
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static int
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archive_compressor_bzip2_options(struct archive_write_filter *f,
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const char *key, const char *value)
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{
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struct private_data *data = (struct private_data *)f->data;
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if (strcmp(key, "compression-level") == 0) {
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if (value == NULL || !(value[0] >= '0' && value[0] <= '9') ||
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value[1] != '\0')
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return (ARCHIVE_WARN);
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data->compression_level = value[0] - '0';
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/* Make '0' be a synonym for '1'. */
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/* This way, bzip2 compressor supports the same 0..9
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* range of levels as gzip. */
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if (data->compression_level < 1)
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data->compression_level = 1;
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return (ARCHIVE_OK);
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}
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return (ARCHIVE_WARN);
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}
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/*
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* Write data to the compressed stream.
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*
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* Returns ARCHIVE_OK if all data written, error otherwise.
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*/
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static int
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archive_compressor_bzip2_write(struct archive_write_filter *f,
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const void *buff, size_t length)
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{
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struct private_data *data = (struct private_data *)f->data;
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/* Update statistics */
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data->total_in += length;
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/* Compress input data to output buffer */
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SET_NEXT_IN(data, buff);
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data->stream.avail_in = length;
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if (drive_compressor(f, data, 0))
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return (ARCHIVE_FATAL);
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return (ARCHIVE_OK);
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}
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/*
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* Finish the compression.
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*/
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static int
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archive_compressor_bzip2_close(struct archive_write_filter *f)
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{
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struct private_data *data = (struct private_data *)f->data;
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int ret, r1;
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/* Finish compression cycle. */
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ret = drive_compressor(f, data, 1);
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if (ret == ARCHIVE_OK) {
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/* Write the last block */
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ret = __archive_write_filter(f->next_filter,
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data->compressed,
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data->compressed_buffer_size - data->stream.avail_out);
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}
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switch (BZ2_bzCompressEnd(&(data->stream))) {
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case BZ_OK:
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break;
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default:
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archive_set_error(f->archive, ARCHIVE_ERRNO_PROGRAMMER,
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"Failed to clean up compressor");
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ret = ARCHIVE_FATAL;
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}
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r1 = __archive_write_close_filter(f->next_filter);
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return (r1 < ret ? r1 : ret);
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}
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static int
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archive_compressor_bzip2_free(struct archive_write_filter *f)
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{
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struct private_data *data = (struct private_data *)f->data;
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free(data->compressed);
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free(data);
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f->data = NULL;
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return (ARCHIVE_OK);
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}
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/*
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* Utility function to push input data through compressor, writing
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* full output blocks as necessary.
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*
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* Note that this handles both the regular write case (finishing ==
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* false) and the end-of-archive case (finishing == true).
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*/
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static int
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drive_compressor(struct archive_write_filter *f,
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struct private_data *data, int finishing)
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{
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int ret;
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for (;;) {
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if (data->stream.avail_out == 0) {
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ret = __archive_write_filter(f->next_filter,
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data->compressed,
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data->compressed_buffer_size);
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if (ret != ARCHIVE_OK) {
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/* TODO: Handle this write failure */
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return (ARCHIVE_FATAL);
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}
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data->stream.next_out = data->compressed;
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data->stream.avail_out = data->compressed_buffer_size;
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}
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/* If there's nothing to do, we're done. */
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if (!finishing && data->stream.avail_in == 0)
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return (ARCHIVE_OK);
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ret = BZ2_bzCompress(&(data->stream),
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finishing ? BZ_FINISH : BZ_RUN);
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switch (ret) {
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case BZ_RUN_OK:
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/* In non-finishing case, did compressor
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* consume everything? */
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if (!finishing && data->stream.avail_in == 0)
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return (ARCHIVE_OK);
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break;
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case BZ_FINISH_OK: /* Finishing: There's more work to do */
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break;
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case BZ_STREAM_END: /* Finishing: all done */
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/* Only occurs in finishing case */
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return (ARCHIVE_OK);
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default:
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/* Any other return value indicates an error */
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archive_set_error(f->archive,
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ARCHIVE_ERRNO_PROGRAMMER,
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"Bzip2 compression failed;"
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" BZ2_bzCompress() returned %d",
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ret);
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return (ARCHIVE_FATAL);
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}
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}
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}
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#endif /* HAVE_BZLIB_H && BZ_CONFIG_ERROR */
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