libarchive/archive_write_add_filter_bzip2.c - third_party/libarchive - Git at Google

 /*-
  * Copyright (c) 2003-2007 Tim Kientzle
  * Copyright (c) 2012 Michihiro NAKAJIMA
  * 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: head/lib/libarchive/archive_write_set_compression_bzip2.c 201091 2009-12-28 02:22:41Z kientzle $");

 #ifdef HAVE_ERRNO_H
 #include <errno.h>
 #endif
 #include <stdio.h>
 #ifdef HAVE_STDLIB_H
 #include <stdlib.h>
 #endif
 #ifdef HAVE_STRING_H
 #include <string.h>
 #endif
 #ifdef HAVE_BZLIB_H
 #include <bzlib.h>
 #endif

 #include "archive.h"
 #include "archive_private.h"
 #include "archive_write_private.h"

 #if ARCHIVE_VERSION_NUMBER < 4000000
 int
 archive_write_set_compression_bzip2(struct archive *a)
 {
 	__archive_write_filters_free(a);
 	return (archive_write_add_filter_bzip2(a));
 }
 #endif

 struct private_data {
 	int		 compression_level;
 #if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR)
 	bz_stream	 stream;
 	int64_t		 total_in;
 	char		*compressed;
 	size_t		 compressed_buffer_size;
 #else
 	struct archive_write_program_data *pdata;
 #endif
 };

 static int archive_compressor_bzip2_close(struct archive_write_filter *);
 static int archive_compressor_bzip2_free(struct archive_write_filter *);
 static int archive_compressor_bzip2_open(struct archive_write_filter *);
 static int archive_compressor_bzip2_options(struct archive_write_filter *,
 		    const char *, const char *);
 static int archive_compressor_bzip2_write(struct archive_write_filter *,
 		    const void *, size_t);

 /*
  * Add a bzip2 compression filter to this write handle.
  */
 int
 archive_write_add_filter_bzip2(struct archive *_a)
 {
 	struct archive_write *a = (struct archive_write *)_a;
 	struct archive_write_filter *f = __archive_write_allocate_filter(_a);
 	struct private_data *data;

 	archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 	    ARCHIVE_STATE_NEW, "archive_write_add_filter_bzip2");

 	data = calloc(1, sizeof(*data));
 	if (data == NULL) {
 		archive_set_error(&a->archive, ENOMEM, "Out of memory");
 		return (ARCHIVE_FATAL);
 	}
 	data->compression_level = 9; /* default */

 	f->data = data;
 	f->options = &archive_compressor_bzip2_options;
 	f->close = &archive_compressor_bzip2_close;
 	f->free = &archive_compressor_bzip2_free;
 	f->open = &archive_compressor_bzip2_open;
 	f->code = ARCHIVE_FILTER_BZIP2;
 	f->name = "bzip2";
 #if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR)
 	return (ARCHIVE_OK);
 #else
 	data->pdata = __archive_write_program_allocate("bzip2");
 	if (data->pdata == NULL) {
 		free(data);
 		archive_set_error(&a->archive, ENOMEM, "Out of memory");
 		return (ARCHIVE_FATAL);
 	}
 	data->compression_level = 0;
 	archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 	    "Using external bzip2 program");
 	return (ARCHIVE_WARN);
 #endif
 }

 /*
  * Set write options.
  */
 static int
 archive_compressor_bzip2_options(struct archive_write_filter *f,
     const char *key, const char *value)
 {
 	struct private_data *data = (struct private_data *)f->data;

 	if (strcmp(key, "compression-level") == 0) {
 		if (value == NULL || !(value[0] >= '0' && value[0] <= '9') ||
 		    value[1] != '\0')
 			return (ARCHIVE_WARN);
 		data->compression_level = value[0] - '0';
 		/* Make '0' be a synonym for '1'. */
 		/* This way, bzip2 compressor supports the same 0..9
 		 * range of levels as gzip. */
 		if (data->compression_level < 1)
 			data->compression_level = 1;
 		return (ARCHIVE_OK);
 	}

 	/* Note: The "warn" return is just to inform the options
 	 * supervisor that we didn't handle it.  It will generate
 	 * a suitable error if no one used this option. */
 	return (ARCHIVE_WARN);
 }

 #if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR)
 /* Don't compile this if we don't have bzlib. */

 /*
  * Yuck.  bzlib.h is not const-correct, so I need this one bit
  * of ugly hackery to convert a const * pointer to a non-const pointer.
  */
 #define	SET_NEXT_IN(st,src)					\
 	(st)->stream.next_in = (char *)(uintptr_t)(const void *)(src)
 static int drive_compressor(struct archive_write_filter *,
 		    struct private_data *, int finishing);

 /*
  * Setup callback.
  */
 static int
 archive_compressor_bzip2_open(struct archive_write_filter *f)
 {
 	struct private_data *data = (struct private_data *)f->data;
 	int ret;

 	ret = __archive_write_open_filter(f->next_filter);
 	if (ret != 0)
 		return (ret);

 	if (data->compressed == NULL) {
 		size_t bs = 65536, bpb;
 		if (f->archive->magic == ARCHIVE_WRITE_MAGIC) {
 			/* Buffer size should be a multiple number of the of bytes
 			 * per block for performance. */
 			bpb = archive_write_get_bytes_per_block(f->archive);
 			if (bpb > bs)
 				bs = bpb;
 			else if (bpb != 0)
 				bs -= bs % bpb;
 		}
 		data->compressed_buffer_size = bs;
 		data->compressed
 		    = (char *)malloc(data->compressed_buffer_size);
 		if (data->compressed == NULL) {
 			archive_set_error(f->archive, ENOMEM,
 			    "Can't allocate data for compression buffer");
 			return (ARCHIVE_FATAL);
 		}
 	}

 	memset(&data->stream, 0, sizeof(data->stream));
 	data->stream.next_out = data->compressed;
 	data->stream.avail_out = data->compressed_buffer_size;
 	f->write = archive_compressor_bzip2_write;

 	/* Initialize compression library */
 	ret = BZ2_bzCompressInit(&(data->stream),
 	    data->compression_level, 0, 30);
 	if (ret == BZ_OK) {
 		f->data = data;
 		return (ARCHIVE_OK);
 	}

 	/* Library setup failed: clean up. */
 	archive_set_error(f->archive, ARCHIVE_ERRNO_MISC,
 	    "Internal error initializing compression library");

 	/* Override the error message if we know what really went wrong. */
 	switch (ret) {
 	case BZ_PARAM_ERROR:
 		archive_set_error(f->archive, ARCHIVE_ERRNO_MISC,
 		    "Internal error initializing compression library: "
 		    "invalid setup parameter");
 		break;
 	case BZ_MEM_ERROR:
 		archive_set_error(f->archive, ENOMEM,
 		    "Internal error initializing compression library: "
 		    "out of memory");
 		break;
 	case BZ_CONFIG_ERROR:
 		archive_set_error(f->archive, ARCHIVE_ERRNO_MISC,
 		    "Internal error initializing compression library: "
 		    "mis-compiled library");
 		break;
 	}

 	return (ARCHIVE_FATAL);

 }

 /*
  * Write data to the compressed stream.
  *
  * Returns ARCHIVE_OK if all data written, error otherwise.
  */
 static int
 archive_compressor_bzip2_write(struct archive_write_filter *f,
     const void *buff, size_t length)
 {
 	struct private_data *data = (struct private_data *)f->data;

 	/* Update statistics */
 	data->total_in += length;

 	/* Compress input data to output buffer */
 	SET_NEXT_IN(data, buff);
 	data->stream.avail_in = length;
 	if (drive_compressor(f, data, 0))
 		return (ARCHIVE_FATAL);
 	return (ARCHIVE_OK);
 }


 /*
  * Finish the compression.
  */
 static int
 archive_compressor_bzip2_close(struct archive_write_filter *f)
 {
 	struct private_data *data = (struct private_data *)f->data;
 	int ret, r1;

 	/* Finish compression cycle. */
 	ret = drive_compressor(f, data, 1);
 	if (ret == ARCHIVE_OK) {
 		/* Write the last block */
 		ret = __archive_write_filter(f->next_filter,
 		    data->compressed,
 		    data->compressed_buffer_size - data->stream.avail_out);
 	}

 	switch (BZ2_bzCompressEnd(&(data->stream))) {
 	case BZ_OK:
 		break;
 	default:
 		archive_set_error(f->archive, ARCHIVE_ERRNO_PROGRAMMER,
 		    "Failed to clean up compressor");
 		ret = ARCHIVE_FATAL;
 	}

 	r1 = __archive_write_close_filter(f->next_filter);
 	return (r1 < ret ? r1 : ret);
 }

 static int
 archive_compressor_bzip2_free(struct archive_write_filter *f)
 {
 	struct private_data *data = (struct private_data *)f->data;
 	free(data->compressed);
 	free(data);
 	f->data = NULL;
 	return (ARCHIVE_OK);
 }

 /*
  * 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_filter *f,
     struct private_data *data, int finishing)
 {
 	int ret;

 	for (;;) {
 		if (data->stream.avail_out == 0) {
 			ret = __archive_write_filter(f->next_filter,
 			    data->compressed,
 			    data->compressed_buffer_size);
 			if (ret != ARCHIVE_OK) {
 				/* TODO: Handle this write failure */
 				return (ARCHIVE_FATAL);
 			}
 			data->stream.next_out = data->compressed;
 			data->stream.avail_out = data->compressed_buffer_size;
 		}

 		/* If there's nothing to do, we're done. */
 		if (!finishing && data->stream.avail_in == 0)
 			return (ARCHIVE_OK);

 		ret = BZ2_bzCompress(&(data->stream),
 		    finishing ? BZ_FINISH : BZ_RUN);

 		switch (ret) {
 		case BZ_RUN_OK:
 			/* In non-finishing case, did compressor
 			 * consume everything? */
 			if (!finishing && data->stream.avail_in == 0)
 				return (ARCHIVE_OK);
 			break;
 		case BZ_FINISH_OK:  /* Finishing: There's more work to do */
 			break;
 		case BZ_STREAM_END: /* Finishing: all done */
 			/* Only occurs in finishing case */
 			return (ARCHIVE_OK);
 		default:
 			/* Any other return value indicates an error */
 			archive_set_error(f->archive,
 			    ARCHIVE_ERRNO_PROGRAMMER,
 			    "Bzip2 compression failed;"
 			    " BZ2_bzCompress() returned %d",
 			    ret);
 			return (ARCHIVE_FATAL);
 		}
 	}
 }

 #else /* HAVE_BZLIB_H && BZ_CONFIG_ERROR */

 static int
 archive_compressor_bzip2_open(struct archive_write_filter *f)
 {
 	struct private_data *data = (struct private_data *)f->data;
 	struct archive_string as;
 	int r;

 	archive_string_init(&as);
 	archive_strcpy(&as, "bzip2");

 	/* Specify compression level. */
 	if (data->compression_level > 0) {
 		archive_strcat(&as, " -");
 		archive_strappend_char(&as, '0' + data->compression_level);
 	}
 	f->write = archive_compressor_bzip2_write;

 	r = __archive_write_program_open(f, data->pdata, as.s);
 	archive_string_free(&as);
 	return (r);
 }

 static int
 archive_compressor_bzip2_write(struct archive_write_filter *f, const void *buff,
     size_t length)
 {
 	struct private_data *data = (struct private_data *)f->data;

 	return __archive_write_program_write(f, data->pdata, buff, length);
 }

 static int
 archive_compressor_bzip2_close(struct archive_write_filter *f)
 {
 	struct private_data *data = (struct private_data *)f->data;

 	return __archive_write_program_close(f, data->pdata);
 }

 static int
 archive_compressor_bzip2_free(struct archive_write_filter *f)
 {
 	struct private_data *data = (struct private_data *)f->data;

 	__archive_write_program_free(data->pdata);
 	free(data);
 	return (ARCHIVE_OK);
 }

 #endif /* HAVE_BZLIB_H && BZ_CONFIG_ERROR */
	/*-
	* Copyright (c) 2003-2007 Tim Kientzle
	* Copyright (c) 2012 Michihiro NAKAJIMA
	* 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: head/lib/libarchive/archive_write_set_compression_bzip2.c 201091 2009-12-28 02:22:41Z kientzle $");

	#ifdef HAVE_ERRNO_H
	#include <errno.h>
	#endif
	#include <stdio.h>
	#ifdef HAVE_STDLIB_H
	#include <stdlib.h>
	#endif
	#ifdef HAVE_STRING_H
	#include <string.h>
	#endif
	#ifdef HAVE_BZLIB_H
	#include <bzlib.h>
	#endif

	#include "archive.h"
	#include "archive_private.h"
	#include "archive_write_private.h"

	#if ARCHIVE_VERSION_NUMBER < 4000000
	int
	archive_write_set_compression_bzip2(struct archive *a)
	{
	__archive_write_filters_free(a);
	return (archive_write_add_filter_bzip2(a));
	}
	#endif

	struct private_data {
	int compression_level;
	#if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR)
	bz_stream stream;
	int64_t total_in;
	char *compressed;
	size_t compressed_buffer_size;
	#else
	struct archive_write_program_data *pdata;
	#endif
	};

	static int archive_compressor_bzip2_close(struct archive_write_filter *);
	static int archive_compressor_bzip2_free(struct archive_write_filter *);
	static int archive_compressor_bzip2_open(struct archive_write_filter *);
	static int archive_compressor_bzip2_options(struct archive_write_filter *,
	const char , const char );
	static int archive_compressor_bzip2_write(struct archive_write_filter *,
	const void *, size_t);

	/*
	* Add a bzip2 compression filter to this write handle.
	*/
	int
	archive_write_add_filter_bzip2(struct archive *_a)
	{
	struct archive_write a = (struct archive_write )_a;
	struct archive_write_filter *f = __archive_write_allocate_filter(_a);
	struct private_data *data;

	archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
	ARCHIVE_STATE_NEW, "archive_write_add_filter_bzip2");

	data = calloc(1, sizeof(*data));
	if (data == NULL) {
	archive_set_error(&a->archive, ENOMEM, "Out of memory");
	return (ARCHIVE_FATAL);
	}
	data->compression_level = 9; /* default */

	f->data = data;
	f->options = &archive_compressor_bzip2_options;
	f->close = &archive_compressor_bzip2_close;
	f->free = &archive_compressor_bzip2_free;
	f->open = &archive_compressor_bzip2_open;
	f->code = ARCHIVE_FILTER_BZIP2;
	f->name = "bzip2";
	#if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR)
	return (ARCHIVE_OK);
	#else
	data->pdata = __archive_write_program_allocate("bzip2");
	if (data->pdata == NULL) {
	free(data);
	archive_set_error(&a->archive, ENOMEM, "Out of memory");
	return (ARCHIVE_FATAL);
	}
	data->compression_level = 0;
	archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
	"Using external bzip2 program");
	return (ARCHIVE_WARN);
	#endif
	}

	/*
	* Set write options.
	*/
	static int
	archive_compressor_bzip2_options(struct archive_write_filter *f,
	const char key, const char value)
	{
	struct private_data data = (struct private_data )f->data;

	if (strcmp(key, "compression-level") == 0) {
	if (value == NULL \|\| !(value[0] >= '0' && value[0] <= '9') \|\|
	value[1] != '\0')
	return (ARCHIVE_WARN);
	data->compression_level = value[0] - '0';
	/* Make '0' be a synonym for '1'. */
	/* This way, bzip2 compressor supports the same 0..9
	* range of levels as gzip. */
	if (data->compression_level < 1)
	data->compression_level = 1;
	return (ARCHIVE_OK);
	}

	/* Note: The "warn" return is just to inform the options
	* supervisor that we didn't handle it. It will generate
	* a suitable error if no one used this option. */
	return (ARCHIVE_WARN);
	}

	#if defined(HAVE_BZLIB_H) && defined(BZ_CONFIG_ERROR)
	/* Don't compile this if we don't have bzlib. */

	/*
	* Yuck. bzlib.h is not const-correct, so I need this one bit
	* of ugly hackery to convert a const * pointer to a non-const pointer.
	*/
	#define SET_NEXT_IN(st,src) \
	(st)->stream.next_in = (char )(uintptr_t)(const void )(src)
	static int drive_compressor(struct archive_write_filter *,
	struct private_data *, int finishing);

	/*
	* Setup callback.
	*/
	static int
	archive_compressor_bzip2_open(struct archive_write_filter *f)
	{
	struct private_data data = (struct private_data )f->data;
	int ret;

	ret = __archive_write_open_filter(f->next_filter);
	if (ret != 0)
	return (ret);

	if (data->compressed == NULL) {
	size_t bs = 65536, bpb;
	if (f->archive->magic == ARCHIVE_WRITE_MAGIC) {
	/* Buffer size should be a multiple number of the of bytes
	* per block for performance. */
	bpb = archive_write_get_bytes_per_block(f->archive);
	if (bpb > bs)
	bs = bpb;
	else if (bpb != 0)
	bs -= bs % bpb;
	}
	data->compressed_buffer_size = bs;
	data->compressed
	= (char *)malloc(data->compressed_buffer_size);
	if (data->compressed == NULL) {
	archive_set_error(f->archive, ENOMEM,
	"Can't allocate data for compression buffer");
	return (ARCHIVE_FATAL);
	}
	}

	memset(&data->stream, 0, sizeof(data->stream));
	data->stream.next_out = data->compressed;
	data->stream.avail_out = data->compressed_buffer_size;
	f->write = archive_compressor_bzip2_write;

	/* Initialize compression library */
	ret = BZ2_bzCompressInit(&(data->stream),
	data->compression_level, 0, 30);
	if (ret == BZ_OK) {
	f->data = data;
	return (ARCHIVE_OK);
	}

	/* Library setup failed: clean up. */
	archive_set_error(f->archive, ARCHIVE_ERRNO_MISC,
	"Internal error initializing compression library");

	/* Override the error message if we know what really went wrong. */
	switch (ret) {
	case BZ_PARAM_ERROR:
	archive_set_error(f->archive, ARCHIVE_ERRNO_MISC,
	"Internal error initializing compression library: "
	"invalid setup parameter");
	break;
	case BZ_MEM_ERROR:
	archive_set_error(f->archive, ENOMEM,
	"Internal error initializing compression library: "
	"out of memory");
	break;
	case BZ_CONFIG_ERROR:
	archive_set_error(f->archive, ARCHIVE_ERRNO_MISC,
	"Internal error initializing compression library: "
	"mis-compiled library");
	break;
	}

	return (ARCHIVE_FATAL);

	}

	/*
	* Write data to the compressed stream.
	*
	* Returns ARCHIVE_OK if all data written, error otherwise.
	*/
	static int
	archive_compressor_bzip2_write(struct archive_write_filter *f,
	const void *buff, size_t length)
	{
	struct private_data data = (struct private_data )f->data;

	/* Update statistics */
	data->total_in += length;

	/* Compress input data to output buffer */
	SET_NEXT_IN(data, buff);
	data->stream.avail_in = length;
	if (drive_compressor(f, data, 0))
	return (ARCHIVE_FATAL);
	return (ARCHIVE_OK);
	}


	/*
	* Finish the compression.
	*/
	static int
	archive_compressor_bzip2_close(struct archive_write_filter *f)
	{
	struct private_data data = (struct private_data )f->data;
	int ret, r1;

	/* Finish compression cycle. */
	ret = drive_compressor(f, data, 1);
	if (ret == ARCHIVE_OK) {
	/* Write the last block */
	ret = __archive_write_filter(f->next_filter,
	data->compressed,
	data->compressed_buffer_size - data->stream.avail_out);
	}

	switch (BZ2_bzCompressEnd(&(data->stream))) {
	case BZ_OK:
	break;
	default:
	archive_set_error(f->archive, ARCHIVE_ERRNO_PROGRAMMER,
	"Failed to clean up compressor");
	ret = ARCHIVE_FATAL;
	}

	r1 = __archive_write_close_filter(f->next_filter);
	return (r1 < ret ? r1 : ret);
	}

	static int
	archive_compressor_bzip2_free(struct archive_write_filter *f)
	{
	struct private_data data = (struct private_data )f->data;
	free(data->compressed);
	free(data);
	f->data = NULL;
	return (ARCHIVE_OK);
	}

	/*
	* 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_filter *f,
	struct private_data *data, int finishing)
	{
	int ret;

	for (;;) {
	if (data->stream.avail_out == 0) {
	ret = __archive_write_filter(f->next_filter,
	data->compressed,
	data->compressed_buffer_size);
	if (ret != ARCHIVE_OK) {
	/* TODO: Handle this write failure */
	return (ARCHIVE_FATAL);
	}
	data->stream.next_out = data->compressed;
	data->stream.avail_out = data->compressed_buffer_size;
	}

	/* If there's nothing to do, we're done. */
	if (!finishing && data->stream.avail_in == 0)
	return (ARCHIVE_OK);

	ret = BZ2_bzCompress(&(data->stream),
	finishing ? BZ_FINISH : BZ_RUN);

	switch (ret) {
	case BZ_RUN_OK:
	/* In non-finishing case, did compressor
	* consume everything? */
	if (!finishing && data->stream.avail_in == 0)
	return (ARCHIVE_OK);
	break;
	case BZ_FINISH_OK: /* Finishing: There's more work to do */
	break;
	case BZ_STREAM_END: /* Finishing: all done */
	/* Only occurs in finishing case */
	return (ARCHIVE_OK);
	default:
	/* Any other return value indicates an error */
	archive_set_error(f->archive,
	ARCHIVE_ERRNO_PROGRAMMER,
	"Bzip2 compression failed;"
	" BZ2_bzCompress() returned %d",
	ret);
	return (ARCHIVE_FATAL);
	}
	}
	}

	#else /* HAVE_BZLIB_H && BZ_CONFIG_ERROR */

	static int
	archive_compressor_bzip2_open(struct archive_write_filter *f)
	{
	struct private_data data = (struct private_data )f->data;
	struct archive_string as;
	int r;

	archive_string_init(&as);
	archive_strcpy(&as, "bzip2");

	/* Specify compression level. */
	if (data->compression_level > 0) {
	archive_strcat(&as, " -");
	archive_strappend_char(&as, '0' + data->compression_level);
	}
	f->write = archive_compressor_bzip2_write;

	r = __archive_write_program_open(f, data->pdata, as.s);
	archive_string_free(&as);
	return (r);
	}

	static int
	archive_compressor_bzip2_write(struct archive_write_filter f, const void buff,
	size_t length)
	{
	struct private_data data = (struct private_data )f->data;

	return __archive_write_program_write(f, data->pdata, buff, length);
	}

	static int
	archive_compressor_bzip2_close(struct archive_write_filter *f)
	{
	struct private_data data = (struct private_data )f->data;

	return __archive_write_program_close(f, data->pdata);
	}

	static int
	archive_compressor_bzip2_free(struct archive_write_filter *f)
	{
	struct private_data data = (struct private_data )f->data;

	__archive_write_program_free(data->pdata);
	free(data);
	return (ARCHIVE_OK);
	}

	#endif /* HAVE_BZLIB_H && BZ_CONFIG_ERROR */