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769756525d
code on the existence of the relevant libraries (actually, the existence of the include files). This will allow the library to be easily ported to systems that don't have these libraries. (Of course, it also means that clients using the library on such systems will not be able to take advantage of the automatic compression format detection.)
335 lines
9.2 KiB
C
335 lines
9.2 KiB
C
/*-
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* Copyright (c) 2003-2004 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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* in this position and unchanged.
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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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/* Don't compile this if we don't have bzlib. */
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#if HAVE_BZLIB_H
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__FBSDID("$FreeBSD$");
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <bzlib.h>
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#include "archive.h"
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#include "archive_private.h"
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struct private_data {
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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 = (void *)(uintptr_t)(const void *)(src)
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static int archive_compressor_bzip2_finish(struct archive *);
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static int archive_compressor_bzip2_init(struct archive *);
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static ssize_t archive_compressor_bzip2_write(struct archive *, const void *,
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size_t);
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static int drive_compressor(struct archive *, struct private_data *,
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int finishing);
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/*
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* Allocate, initialize and return an archive object.
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*/
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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_check_magic(a, ARCHIVE_WRITE_MAGIC, ARCHIVE_STATE_NEW);
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a->compression_init = &archive_compressor_bzip2_init;
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a->compression_code = ARCHIVE_COMPRESSION_BZIP2;
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a->compression_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_init(struct archive *a)
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{
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int ret;
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struct private_data *state;
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a->compression_code = ARCHIVE_COMPRESSION_BZIP2;
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a->compression_name = "bzip2";
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if (a->client_opener != NULL) {
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ret = (a->client_opener)(a, a->client_data);
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if (ret != 0)
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return (ret);
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}
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state = malloc(sizeof(*state));
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if (state == NULL) {
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archive_set_error(a, ENOMEM,
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"Can't allocate data for compression");
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return (ARCHIVE_FATAL);
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}
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memset(state, 0, sizeof(*state));
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state->compressed_buffer_size = a->bytes_per_block;
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state->compressed = malloc(state->compressed_buffer_size);
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if (state->compressed == NULL) {
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archive_set_error(a, ENOMEM,
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"Can't allocate data for compression buffer");
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free(state);
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return (ARCHIVE_FATAL);
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}
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state->stream.next_out = state->compressed;
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state->stream.avail_out = state->compressed_buffer_size;
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a->compression_write = archive_compressor_bzip2_write;
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a->compression_finish = archive_compressor_bzip2_finish;
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/* Initialize compression library */
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ret = BZ2_bzCompressInit(&(state->stream), 9, 0, 30);
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if (ret == BZ_OK) {
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a->compression_data = state;
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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(a, ARCHIVE_ERRNO_MISC,
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"Internal error initializing compression library");
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free(state->compressed);
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free(state);
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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(a, 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(a, 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(a, 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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* Write data to the compressed stream.
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*/
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static ssize_t
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archive_compressor_bzip2_write(struct archive *a, const void *buff,
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size_t length)
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{
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struct private_data *state;
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state = a->compression_data;
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if (!a->client_writer) {
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archive_set_error(a, ARCHIVE_ERRNO_PROGRAMMER,
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"No write callback is registered? "
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"This is probably an internal programming error.");
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return (ARCHIVE_FATAL);
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}
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/* Update statistics */
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state->total_in += length;
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/* Compress input data to output buffer */
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SET_NEXT_IN(state, buff);
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state->stream.avail_in = length;
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if (drive_compressor(a, state, 0))
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return (-1);
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a->file_position += length;
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return (length);
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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_finish(struct archive *a)
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{
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ssize_t block_length;
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int ret;
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struct private_data *state;
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ssize_t target_block_length;
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unsigned tocopy;
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state = a->compression_data;
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ret = ARCHIVE_OK;
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if (a->client_writer == NULL) {
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archive_set_error(a, ARCHIVE_ERRNO_PROGRAMMER,
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"No write callback is registered?\n"
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"This is probably an internal programming error.");
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ret = ARCHIVE_FATAL;
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goto cleanup;
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}
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/* By default, always pad the uncompressed data. */
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if (a->pad_uncompressed) {
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tocopy = a->bytes_per_block -
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(state->total_in % a->bytes_per_block);
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while (tocopy > 0 && tocopy < (unsigned)a->bytes_per_block) {
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SET_NEXT_IN(state, a->nulls);
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state->stream.avail_in = tocopy < a->null_length ?
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tocopy : a->null_length;
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state->total_in += state->stream.avail_in;
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tocopy -= state->stream.avail_in;
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ret = drive_compressor(a, state, 0);
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if (ret != ARCHIVE_OK)
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goto cleanup;
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}
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}
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/* Finish compression cycle. */
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if ((ret = drive_compressor(a, state, 1)))
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goto cleanup;
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/* Optionally, pad the final compressed block. */
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block_length = state->stream.next_out - state->compressed;
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/* Tricky calculation to determine size of last block. */
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target_block_length = block_length;
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if (a->bytes_in_last_block <= 0)
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/* Default or Zero: pad to full block */
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target_block_length = a->bytes_per_block;
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else
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/* Round length to next multiple of bytes_in_last_block. */
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target_block_length = a->bytes_in_last_block *
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( (block_length + a->bytes_in_last_block - 1) /
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a->bytes_in_last_block);
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if (target_block_length > a->bytes_per_block)
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target_block_length = a->bytes_per_block;
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if (block_length < target_block_length) {
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memset(state->stream.next_out, 0,
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target_block_length - block_length);
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block_length = target_block_length;
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}
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/* Write the last block */
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ret = (a->client_writer)(a, a->client_data, state->compressed,
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block_length);
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a->raw_position += ret;
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if (ret != 0)
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goto cleanup;
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/* Cleanup: shut down compressor, release memory, etc. */
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cleanup:
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switch (BZ2_bzCompressEnd(&(state->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(a, 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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free(state->compressed);
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free(state);
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/* Close the output */
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if (a->client_closer != NULL)
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(a->client_closer)(a, a->client_data);
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return (ret);
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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 *a, struct private_data *state, int finishing)
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{
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size_t ret;
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for (;;) {
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if (state->stream.avail_out == 0) {
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ret = (a->client_writer)(a, a->client_data,
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state->compressed, state->compressed_buffer_size);
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if (ret <= 0) {
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/* TODO: Handle this write failure */
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return (ARCHIVE_FATAL);
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} else if (ret < state->compressed_buffer_size) {
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/* Short write: Move remainder to
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* front and keep filling */
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memmove(state->compressed,
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state->compressed + ret,
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state->compressed_buffer_size - ret);
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}
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a->raw_position += ret;
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state->stream.next_out = state->compressed +
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state->compressed_buffer_size - ret;
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state->stream.avail_out = ret;
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}
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ret = BZ2_bzCompress(&(state->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 && state->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(a, ARCHIVE_ERRNO_PROGRAMMER,
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"Bzip2 compression failed");
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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 */
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