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

 /*-
  * 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("$FreeBSD$");
 //#undef HAVE_LZO_LZOCONF_H
 //#undef HAVE_LZO_LZO1X_H

 #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_LZO_LZOCONF_H
 #include <lzo/lzoconf.h>
 #endif
 #ifdef HAVE_LZO_LZO1X_H
 #include <lzo/lzo1x.h>
 #endif

 #include "archive.h"
 #include "archive_string.h"
 #include "archive_endian.h"
 #include "archive_write_private.h"

 enum lzo_method {
 	METHOD_LZO1X_1 = 1,
 	METHOD_LZO1X_1_15 = 2,
 	METHOD_LZO1X_999 = 3
 };
 struct write_lzop {
 	int compression_level;
 #if defined(HAVE_LZO_LZOCONF_H) && defined(HAVE_LZO_LZO1X_H)
 	unsigned char	*uncompressed;
 	size_t		 uncompressed_buffer_size;
 	size_t		 uncompressed_avail_bytes;
 	unsigned char	*compressed;
 	size_t		 compressed_buffer_size;
 	enum lzo_method	 method;
 	unsigned char	 level;
 	lzo_voidp	 work_buffer;
 	lzo_uint32	 work_buffer_size;
 	char		 header_written;
 #else
 	struct archive_write_program_data *pdata;
 #endif
 };

 static int archive_write_lzop_open(struct archive_write_filter *);
 static int archive_write_lzop_options(struct archive_write_filter *,
 		    const char *, const char *);
 static int archive_write_lzop_write(struct archive_write_filter *,
 		    const void *, size_t);
 static int archive_write_lzop_close(struct archive_write_filter *);
 static int archive_write_lzop_free(struct archive_write_filter *);

 #if defined(HAVE_LZO_LZOCONF_H) && defined(HAVE_LZO_LZO1X_H)
 /* Maximum block size. */
 #define BLOCK_SIZE			(256 * 1024)
 /* Block information is composed of uncompressed size(4 bytes),
  * compressed size(4 bytes) and the checksum of uncompressed data(4 bytes)
  * in this lzop writer. */
 #define BLOCK_INfO_SIZE			12

 #define HEADER_VERSION			9
 #define HEADER_LIBVERSION		11
 #define HEADER_METHOD			15
 #define HEADER_LEVEL			16
 #define HEADER_MTIME_LOW		25
 #define HEADER_MTIME_HIGH		29
 #define HEADER_H_CHECKSUM		34

 /*
  * Header template.
  */
 static const unsigned char header[] = {
 	/* LZOP Magic code 9 bytes */
 	0x89, 0x4c, 0x5a, 0x4f, 0x00, 0x0d, 0x0a, 0x1a, 0x0a,
 	/* LZOP utility version(fake data) 2 bytes */
 	0x10, 0x30,
 	/* LZO library version 2 bytes */
 	0x09, 0x40,
 	/* Minimum required LZO library version 2 bytes */
 	0x09, 0x40,
 	/* Method */
 	1,
 	/* Level */
 	5,
 	/* Flags 4 bytes
 	 *  -OS Unix
 	 *  -Stdout
 	 *  -Stdin
 	 *  -Adler32 used for uncompressed data 4 bytes */
 	0x03, 0x00, 0x00, 0x0d,
 	/* Mode (AE_IFREG | 0644) 4 bytes */
 	0x00, 0x00, 0x81, 0xa4,
 	/* Mtime low 4 bytes */
 	0x00, 0x00, 0x00, 0x00,
 	/* Mtime high 4 bytes */
 	0x00, 0x00, 0x00, 0x00,
 	/* Filename length */
 	0x00,
 	/* Header checksum 4 bytes */
 	0x00, 0x00, 0x00, 0x00,
 };
 #endif

 int
 archive_write_add_filter_lzop(struct archive *_a)
 {
 	struct archive_write_filter *f = __archive_write_allocate_filter(_a);
 	struct write_lzop *data;

 	archive_check_magic(_a, ARCHIVE_WRITE_MAGIC,
 	    ARCHIVE_STATE_NEW, "archive_write_add_filter_lzop");

 	data = calloc(1, sizeof(*data));
 	if (data == NULL) {
 		archive_set_error(_a, ENOMEM, "Can't allocate memory");
 		return (ARCHIVE_FATAL);
 	}

 	f->name = "lzop";
 	f->code = ARCHIVE_FILTER_LZOP;
 	f->data = data;
 	f->open = archive_write_lzop_open;
 	f->options = archive_write_lzop_options;
 	f->write = archive_write_lzop_write;
 	f->close = archive_write_lzop_close;
 	f->free = archive_write_lzop_free;
 #if defined(HAVE_LZO_LZOCONF_H) && defined(HAVE_LZO_LZO1X_H)
 	if (lzo_init() != LZO_E_OK) {
 		free(data);
 		archive_set_error(_a, ARCHIVE_ERRNO_MISC,
 		    "lzo_init(type check) failed");
 		return (ARCHIVE_FATAL);
 	}
 	if (lzo_version() < 0x940) {
 		free(data);
 		archive_set_error(_a, ARCHIVE_ERRNO_MISC,
 		    "liblzo library is too old(%s < 0.940)",
 		    lzo_version_string());
 		return (ARCHIVE_FATAL);
 	}
 	data->compression_level = 5;
 	return (ARCHIVE_OK);
 #else
 	data->pdata = __archive_write_program_allocate("lzop");
 	if (data->pdata == NULL) {
 		free(data);
 		archive_set_error(_a, ENOMEM, "Can't allocate memory");
 		return (ARCHIVE_FATAL);
 	}
 	data->compression_level = 0;
 	/* Note: We return "warn" to inform of using an external lzop
 	 * program. */
 	archive_set_error(_a, ARCHIVE_ERRNO_MISC,
 	    "Using external lzop program for lzop compression");
 	return (ARCHIVE_WARN);
 #endif
 }

 static int
 archive_write_lzop_free(struct archive_write_filter *f)
 {
 	struct write_lzop *data = (struct write_lzop *)f->data;

 #if defined(HAVE_LZO_LZOCONF_H) && defined(HAVE_LZO_LZO1X_H)
 	free(data->uncompressed);
 	free(data->compressed);
 	free(data->work_buffer);
 #else
 	__archive_write_program_free(data->pdata);
 #endif
 	free(data);
 	return (ARCHIVE_OK);
 }

 static int
 archive_write_lzop_options(struct archive_write_filter *f, const char *key,
     const char *value)
 {
 	struct write_lzop *data = (struct write_lzop *)f->data;

 	if (strcmp(key, "compression-level") == 0) {
 		if (value == NULL || !(value[0] >= '1' && value[0] <= '9') ||
 		    value[1] != '\0')
 			return (ARCHIVE_WARN);
 		data->compression_level = value[0] - '0';
 		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_LZO_LZOCONF_H) && defined(HAVE_LZO_LZO1X_H)
 static int
 archive_write_lzop_open(struct archive_write_filter *f)
 {
 	struct write_lzop *data = (struct write_lzop *)f->data;
 	int ret;

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

 	switch (data->compression_level) {
 	case 1:
 		data->method = METHOD_LZO1X_1_15; data->level = 1; break;
 	default:
 	case 2: case 3: case 4: case 5: case 6:
 		data->method = METHOD_LZO1X_1; data->level = 5; break;
 	case 7:
 		data->method = METHOD_LZO1X_999; data->level = 7; break;
 	case 8:
 		data->method = METHOD_LZO1X_999; data->level = 8; break;
 	case 9:
 		data->method = METHOD_LZO1X_999; data->level = 9; break;
 	}
 	switch (data->method) {
 	case METHOD_LZO1X_1:
 		data->work_buffer_size = LZO1X_1_MEM_COMPRESS; break;
 	case METHOD_LZO1X_1_15:
 		data->work_buffer_size = LZO1X_1_15_MEM_COMPRESS; break;
 	case METHOD_LZO1X_999:
 		data->work_buffer_size = LZO1X_999_MEM_COMPRESS; break;
 	}
 	if (data->work_buffer == NULL) {
 		data->work_buffer = (lzo_voidp)malloc(data->work_buffer_size);
 		if (data->work_buffer == NULL) {
 			archive_set_error(f->archive, ENOMEM,
 			    "Can't allocate data for compression buffer");
 			return (ARCHIVE_FATAL);
 		}
 	}
 	if (data->compressed == NULL) {
 		data->compressed_buffer_size = sizeof(header) +
 		    BLOCK_SIZE + (BLOCK_SIZE >> 4) + 64 + 3;
 		data->compressed = (unsigned 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);
 		}
 	}
 	if (data->uncompressed == NULL) {
 		data->uncompressed_buffer_size = BLOCK_SIZE;
 		data->uncompressed = (unsigned char *)
 		    malloc(data->uncompressed_buffer_size);
 		if (data->uncompressed == NULL) {
 			archive_set_error(f->archive, ENOMEM,
 			    "Can't allocate data for compression buffer");
 			return (ARCHIVE_FATAL);
 		}
 		data->uncompressed_avail_bytes = BLOCK_SIZE;
 	}
 	return (ARCHIVE_OK);
 }

 static int
 make_header(struct archive_write_filter *f)
 {
 	struct write_lzop *data = (struct write_lzop *)f->data;
 	int64_t t;
 	uint32_t checksum;

 	memcpy(data->compressed, header, sizeof(header));
 	/* Overwrite library version. */
 	data->compressed[HEADER_LIBVERSION] = (unsigned char )
 	    (lzo_version() >> 8) & 0xff;
 	data->compressed[HEADER_LIBVERSION + 1] = (unsigned char )
 	    lzo_version() & 0xff;
 	/* Overwrite method and level. */
 	data->compressed[HEADER_METHOD] = (unsigned char)data->method;
 	data->compressed[HEADER_LEVEL] = data->level;
 	/* Overwrite mtime with current time. */
 	t = (int64_t)time(NULL);
 	archive_be32enc(&data->compressed[HEADER_MTIME_LOW],
 	    (uint32_t)(t & 0xffffffff));
 	archive_be32enc(&data->compressed[HEADER_MTIME_HIGH],
 	    (uint32_t)((t >> 32) & 0xffffffff));
 	/* Overwrite header checksum with calculated value. */
 	checksum = lzo_adler32(1, data->compressed + HEADER_VERSION,
 			(lzo_uint)(HEADER_H_CHECKSUM - HEADER_VERSION));
 	archive_be32enc(&data->compressed[HEADER_H_CHECKSUM], checksum);
 	return (sizeof(header));
 }

 static int
 drive_compressor(struct archive_write_filter *f)
 {
 	struct write_lzop *data = (struct write_lzop *)f->data;
 	unsigned char *p;
 	const int block_info_bytes = 12;
 	int header_bytes, r;
 	lzo_uint usize, csize;
 	uint32_t checksum;

 	if (!data->header_written) {
 		header_bytes = make_header(f);
 		data->header_written = 1;
 	} else
 		header_bytes = 0;
 	p = data->compressed;

 	usize = (lzo_uint)
 	    (data->uncompressed_buffer_size - data->uncompressed_avail_bytes);
 	csize = 0;
 	switch (data->method) {
 	default:
 	case METHOD_LZO1X_1:
 		r = lzo1x_1_compress(data->uncompressed, usize,
 			p + header_bytes + block_info_bytes, &csize,
 			data->work_buffer);
 		break;
 	case METHOD_LZO1X_1_15:
 		r = lzo1x_1_15_compress(data->uncompressed, usize,
 			p + header_bytes + block_info_bytes, &csize,
 			data->work_buffer);
 		break;
 	case METHOD_LZO1X_999:
 		r = lzo1x_999_compress_level(data->uncompressed, usize,
 			p + header_bytes + block_info_bytes, &csize,
 			data->work_buffer, NULL, 0, 0, data->level);
 		break;
 	}
 	if (r != LZO_E_OK) {
 		archive_set_error(f->archive, ARCHIVE_ERRNO_MISC,
 		    "Lzop compression failed: returned status %d", r);
 		return (ARCHIVE_FATAL);
 	}

 	/* Store uncompressed size. */
 	archive_be32enc(p + header_bytes, (uint32_t)usize);
 	/* Store the checksum of the uncompressed data. */
 	checksum = lzo_adler32(1, data->uncompressed, usize);
 	archive_be32enc(p + header_bytes + 8, checksum);

 	if (csize < usize) {
 		/* Store compressed size. */
 		archive_be32enc(p + header_bytes + 4, (uint32_t)csize);
 		r = __archive_write_filter(f->next_filter, data->compressed,
 			header_bytes + block_info_bytes + csize);
 	} else {
 		/*
 		 * This case, we output uncompressed data instead.
 		 */
 		/* Store uncompressed size as compressed size. */
 		archive_be32enc(p + header_bytes + 4, (uint32_t)usize);
 		r = __archive_write_filter(f->next_filter, data->compressed,
 			header_bytes + block_info_bytes);
 		if (r != ARCHIVE_OK)
 			return (ARCHIVE_FATAL);
 		r = __archive_write_filter(f->next_filter, data->uncompressed,
 			usize);
 	}

 	if (r != ARCHIVE_OK)
 		return (ARCHIVE_FATAL);
 	return (ARCHIVE_OK);
 }

 static int
 archive_write_lzop_write(struct archive_write_filter *f,
     const void *buff, size_t length)
 {
 	struct write_lzop *data = (struct write_lzop *)f->data;
 	const char *p = buff;
 	int r;

 	do {
 		if (data->uncompressed_avail_bytes > length) {
 			memcpy(data->uncompressed
 				+ data->uncompressed_buffer_size
 				- data->uncompressed_avail_bytes,
 			    p, length);
 			data->uncompressed_avail_bytes -= length;
 			return (ARCHIVE_OK);
 		}

 		memcpy(data->uncompressed + data->uncompressed_buffer_size
 			- data->uncompressed_avail_bytes,
 		    p, data->uncompressed_avail_bytes);
 		length -= data->uncompressed_avail_bytes;
 		p += data->uncompressed_avail_bytes;
 		data->uncompressed_avail_bytes = 0;

 		r = drive_compressor(f);
 		if (r != ARCHIVE_OK) return (r);
 		data->uncompressed_avail_bytes = BLOCK_SIZE;
 	} while (length);

 	return (ARCHIVE_OK);
 }

 static int
 archive_write_lzop_close(struct archive_write_filter *f)
 {
 	struct write_lzop *data = (struct write_lzop *)f->data;
 	const uint32_t endmark = 0;
 	int r;

 	if (data->uncompressed_avail_bytes < BLOCK_SIZE) {
 		/* Compress and output remaining data. */
 		r = drive_compressor(f);
 		if (r != ARCHIVE_OK)
 			return (r);
 	}
 	/* Write a zero uncompressed size as the end mark of the series of
 	 * compressed block. */
 	r = __archive_write_filter(f->next_filter, &endmark, sizeof(endmark));
 	if (r != ARCHIVE_OK)
 		return (r);
 	return (__archive_write_close_filter(f->next_filter));
 }

 #else
 static int
 archive_write_lzop_open(struct archive_write_filter *f)
 {
 	struct write_lzop *data = (struct write_lzop *)f->data;
 	struct archive_string as;
 	int r;

 	archive_string_init(&as);
 	archive_strcpy(&as, "lzop");
 	/* Specify compression level. */
 	if (data->compression_level > 0) {
 		archive_strappend_char(&as, ' ');
 		archive_strappend_char(&as, '-');
 		archive_strappend_char(&as, '0' + data->compression_level);
 	}

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

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

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

 static int
 archive_write_lzop_close(struct archive_write_filter *f)
 {
 	struct write_lzop *data = (struct write_lzop *)f->data;

 	return __archive_write_program_close(f, data->pdata);
 }
 #endif
	/*-
	* 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("$FreeBSD$");
	//#undef HAVE_LZO_LZOCONF_H
	//#undef HAVE_LZO_LZO1X_H

	#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_LZO_LZOCONF_H
	#include <lzo/lzoconf.h>
	#endif
	#ifdef HAVE_LZO_LZO1X_H
	#include <lzo/lzo1x.h>
	#endif

	#include "archive.h"
	#include "archive_string.h"
	#include "archive_endian.h"
	#include "archive_write_private.h"

	enum lzo_method {
	METHOD_LZO1X_1 = 1,
	METHOD_LZO1X_1_15 = 2,
	METHOD_LZO1X_999 = 3
	};
	struct write_lzop {
	int compression_level;
	#if defined(HAVE_LZO_LZOCONF_H) && defined(HAVE_LZO_LZO1X_H)
	unsigned char *uncompressed;
	size_t uncompressed_buffer_size;
	size_t uncompressed_avail_bytes;
	unsigned char *compressed;
	size_t compressed_buffer_size;
	enum lzo_method method;
	unsigned char level;
	lzo_voidp work_buffer;
	lzo_uint32 work_buffer_size;
	char header_written;
	#else
	struct archive_write_program_data *pdata;
	#endif
	};

	static int archive_write_lzop_open(struct archive_write_filter *);
	static int archive_write_lzop_options(struct archive_write_filter *,
	const char , const char );
	static int archive_write_lzop_write(struct archive_write_filter *,
	const void *, size_t);
	static int archive_write_lzop_close(struct archive_write_filter *);
	static int archive_write_lzop_free(struct archive_write_filter *);

	#if defined(HAVE_LZO_LZOCONF_H) && defined(HAVE_LZO_LZO1X_H)
	/* Maximum block size. */
	#define BLOCK_SIZE (256 * 1024)
	/* Block information is composed of uncompressed size(4 bytes),
	* compressed size(4 bytes) and the checksum of uncompressed data(4 bytes)
	* in this lzop writer. */
	#define BLOCK_INfO_SIZE 12

	#define HEADER_VERSION 9
	#define HEADER_LIBVERSION 11
	#define HEADER_METHOD 15
	#define HEADER_LEVEL 16
	#define HEADER_MTIME_LOW 25
	#define HEADER_MTIME_HIGH 29
	#define HEADER_H_CHECKSUM 34

	/*
	* Header template.
	*/
	static const unsigned char header[] = {
	/* LZOP Magic code 9 bytes */
	0x89, 0x4c, 0x5a, 0x4f, 0x00, 0x0d, 0x0a, 0x1a, 0x0a,
	/* LZOP utility version(fake data) 2 bytes */
	0x10, 0x30,
	/* LZO library version 2 bytes */
	0x09, 0x40,
	/* Minimum required LZO library version 2 bytes */
	0x09, 0x40,
	/* Method */
	1,
	/* Level */
	5,
	/* Flags 4 bytes
	* -OS Unix
	* -Stdout
	* -Stdin
	* -Adler32 used for uncompressed data 4 bytes */
	0x03, 0x00, 0x00, 0x0d,
	/* Mode (AE_IFREG \| 0644) 4 bytes */
	0x00, 0x00, 0x81, 0xa4,
	/* Mtime low 4 bytes */
	0x00, 0x00, 0x00, 0x00,
	/* Mtime high 4 bytes */
	0x00, 0x00, 0x00, 0x00,
	/* Filename length */
	0x00,
	/* Header checksum 4 bytes */
	0x00, 0x00, 0x00, 0x00,
	};
	#endif

	int
	archive_write_add_filter_lzop(struct archive *_a)
	{
	struct archive_write_filter *f = __archive_write_allocate_filter(_a);
	struct write_lzop *data;

	archive_check_magic(_a, ARCHIVE_WRITE_MAGIC,
	ARCHIVE_STATE_NEW, "archive_write_add_filter_lzop");

	data = calloc(1, sizeof(*data));
	if (data == NULL) {
	archive_set_error(_a, ENOMEM, "Can't allocate memory");
	return (ARCHIVE_FATAL);
	}

	f->name = "lzop";
	f->code = ARCHIVE_FILTER_LZOP;
	f->data = data;
	f->open = archive_write_lzop_open;
	f->options = archive_write_lzop_options;
	f->write = archive_write_lzop_write;
	f->close = archive_write_lzop_close;
	f->free = archive_write_lzop_free;
	#if defined(HAVE_LZO_LZOCONF_H) && defined(HAVE_LZO_LZO1X_H)
	if (lzo_init() != LZO_E_OK) {
	free(data);
	archive_set_error(_a, ARCHIVE_ERRNO_MISC,
	"lzo_init(type check) failed");
	return (ARCHIVE_FATAL);
	}
	if (lzo_version() < 0x940) {
	free(data);
	archive_set_error(_a, ARCHIVE_ERRNO_MISC,
	"liblzo library is too old(%s < 0.940)",
	lzo_version_string());
	return (ARCHIVE_FATAL);
	}
	data->compression_level = 5;
	return (ARCHIVE_OK);
	#else
	data->pdata = __archive_write_program_allocate("lzop");
	if (data->pdata == NULL) {
	free(data);
	archive_set_error(_a, ENOMEM, "Can't allocate memory");
	return (ARCHIVE_FATAL);
	}
	data->compression_level = 0;
	/* Note: We return "warn" to inform of using an external lzop
	* program. */
	archive_set_error(_a, ARCHIVE_ERRNO_MISC,
	"Using external lzop program for lzop compression");
	return (ARCHIVE_WARN);
	#endif
	}

	static int
	archive_write_lzop_free(struct archive_write_filter *f)
	{
	struct write_lzop data = (struct write_lzop )f->data;

	#if defined(HAVE_LZO_LZOCONF_H) && defined(HAVE_LZO_LZO1X_H)
	free(data->uncompressed);
	free(data->compressed);
	free(data->work_buffer);
	#else
	__archive_write_program_free(data->pdata);
	#endif
	free(data);
	return (ARCHIVE_OK);
	}

	static int
	archive_write_lzop_options(struct archive_write_filter f, const char key,
	const char *value)
	{
	struct write_lzop data = (struct write_lzop )f->data;

	if (strcmp(key, "compression-level") == 0) {
	if (value == NULL \|\| !(value[0] >= '1' && value[0] <= '9') \|\|
	value[1] != '\0')
	return (ARCHIVE_WARN);
	data->compression_level = value[0] - '0';
	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_LZO_LZOCONF_H) && defined(HAVE_LZO_LZO1X_H)
	static int
	archive_write_lzop_open(struct archive_write_filter *f)
	{
	struct write_lzop data = (struct write_lzop )f->data;
	int ret;

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

	switch (data->compression_level) {
	case 1:
	data->method = METHOD_LZO1X_1_15; data->level = 1; break;
	default:
	case 2: case 3: case 4: case 5: case 6:
	data->method = METHOD_LZO1X_1; data->level = 5; break;
	case 7:
	data->method = METHOD_LZO1X_999; data->level = 7; break;
	case 8:
	data->method = METHOD_LZO1X_999; data->level = 8; break;
	case 9:
	data->method = METHOD_LZO1X_999; data->level = 9; break;
	}
	switch (data->method) {
	case METHOD_LZO1X_1:
	data->work_buffer_size = LZO1X_1_MEM_COMPRESS; break;
	case METHOD_LZO1X_1_15:
	data->work_buffer_size = LZO1X_1_15_MEM_COMPRESS; break;
	case METHOD_LZO1X_999:
	data->work_buffer_size = LZO1X_999_MEM_COMPRESS; break;
	}
	if (data->work_buffer == NULL) {
	data->work_buffer = (lzo_voidp)malloc(data->work_buffer_size);
	if (data->work_buffer == NULL) {
	archive_set_error(f->archive, ENOMEM,
	"Can't allocate data for compression buffer");
	return (ARCHIVE_FATAL);
	}
	}
	if (data->compressed == NULL) {
	data->compressed_buffer_size = sizeof(header) +
	BLOCK_SIZE + (BLOCK_SIZE >> 4) + 64 + 3;
	data->compressed = (unsigned 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);
	}
	}
	if (data->uncompressed == NULL) {
	data->uncompressed_buffer_size = BLOCK_SIZE;
	data->uncompressed = (unsigned char *)
	malloc(data->uncompressed_buffer_size);
	if (data->uncompressed == NULL) {
	archive_set_error(f->archive, ENOMEM,
	"Can't allocate data for compression buffer");
	return (ARCHIVE_FATAL);
	}
	data->uncompressed_avail_bytes = BLOCK_SIZE;
	}
	return (ARCHIVE_OK);
	}

	static int
	make_header(struct archive_write_filter *f)
	{
	struct write_lzop data = (struct write_lzop )f->data;
	int64_t t;
	uint32_t checksum;

	memcpy(data->compressed, header, sizeof(header));
	/* Overwrite library version. */
	data->compressed[HEADER_LIBVERSION] = (unsigned char )
	(lzo_version() >> 8) & 0xff;
	data->compressed[HEADER_LIBVERSION + 1] = (unsigned char )
	lzo_version() & 0xff;
	/* Overwrite method and level. */
	data->compressed[HEADER_METHOD] = (unsigned char)data->method;
	data->compressed[HEADER_LEVEL] = data->level;
	/* Overwrite mtime with current time. */
	t = (int64_t)time(NULL);
	archive_be32enc(&data->compressed[HEADER_MTIME_LOW],
	(uint32_t)(t & 0xffffffff));
	archive_be32enc(&data->compressed[HEADER_MTIME_HIGH],
	(uint32_t)((t >> 32) & 0xffffffff));
	/* Overwrite header checksum with calculated value. */
	checksum = lzo_adler32(1, data->compressed + HEADER_VERSION,
	(lzo_uint)(HEADER_H_CHECKSUM - HEADER_VERSION));
	archive_be32enc(&data->compressed[HEADER_H_CHECKSUM], checksum);
	return (sizeof(header));
	}

	static int
	drive_compressor(struct archive_write_filter *f)
	{
	struct write_lzop data = (struct write_lzop )f->data;
	unsigned char *p;
	const int block_info_bytes = 12;
	int header_bytes, r;
	lzo_uint usize, csize;
	uint32_t checksum;

	if (!data->header_written) {
	header_bytes = make_header(f);
	data->header_written = 1;
	} else
	header_bytes = 0;
	p = data->compressed;

	usize = (lzo_uint)
	(data->uncompressed_buffer_size - data->uncompressed_avail_bytes);
	csize = 0;
	switch (data->method) {
	default:
	case METHOD_LZO1X_1:
	r = lzo1x_1_compress(data->uncompressed, usize,
	p + header_bytes + block_info_bytes, &csize,
	data->work_buffer);
	break;
	case METHOD_LZO1X_1_15:
	r = lzo1x_1_15_compress(data->uncompressed, usize,
	p + header_bytes + block_info_bytes, &csize,
	data->work_buffer);
	break;
	case METHOD_LZO1X_999:
	r = lzo1x_999_compress_level(data->uncompressed, usize,
	p + header_bytes + block_info_bytes, &csize,
	data->work_buffer, NULL, 0, 0, data->level);
	break;
	}
	if (r != LZO_E_OK) {
	archive_set_error(f->archive, ARCHIVE_ERRNO_MISC,
	"Lzop compression failed: returned status %d", r);
	return (ARCHIVE_FATAL);
	}

	/* Store uncompressed size. */
	archive_be32enc(p + header_bytes, (uint32_t)usize);
	/* Store the checksum of the uncompressed data. */
	checksum = lzo_adler32(1, data->uncompressed, usize);
	archive_be32enc(p + header_bytes + 8, checksum);

	if (csize < usize) {
	/* Store compressed size. */
	archive_be32enc(p + header_bytes + 4, (uint32_t)csize);
	r = __archive_write_filter(f->next_filter, data->compressed,
	header_bytes + block_info_bytes + csize);
	} else {
	/*
	* This case, we output uncompressed data instead.
	*/
	/* Store uncompressed size as compressed size. */
	archive_be32enc(p + header_bytes + 4, (uint32_t)usize);
	r = __archive_write_filter(f->next_filter, data->compressed,
	header_bytes + block_info_bytes);
	if (r != ARCHIVE_OK)
	return (ARCHIVE_FATAL);
	r = __archive_write_filter(f->next_filter, data->uncompressed,
	usize);
	}

	if (r != ARCHIVE_OK)
	return (ARCHIVE_FATAL);
	return (ARCHIVE_OK);
	}

	static int
	archive_write_lzop_write(struct archive_write_filter *f,
	const void *buff, size_t length)
	{
	struct write_lzop data = (struct write_lzop )f->data;
	const char *p = buff;
	int r;

	do {
	if (data->uncompressed_avail_bytes > length) {
	memcpy(data->uncompressed
	+ data->uncompressed_buffer_size
	- data->uncompressed_avail_bytes,
	p, length);
	data->uncompressed_avail_bytes -= length;
	return (ARCHIVE_OK);
	}

	memcpy(data->uncompressed + data->uncompressed_buffer_size
	- data->uncompressed_avail_bytes,
	p, data->uncompressed_avail_bytes);
	length -= data->uncompressed_avail_bytes;
	p += data->uncompressed_avail_bytes;
	data->uncompressed_avail_bytes = 0;

	r = drive_compressor(f);
	if (r != ARCHIVE_OK) return (r);
	data->uncompressed_avail_bytes = BLOCK_SIZE;
	} while (length);

	return (ARCHIVE_OK);
	}

	static int
	archive_write_lzop_close(struct archive_write_filter *f)
	{
	struct write_lzop data = (struct write_lzop )f->data;
	const uint32_t endmark = 0;
	int r;

	if (data->uncompressed_avail_bytes < BLOCK_SIZE) {
	/* Compress and output remaining data. */
	r = drive_compressor(f);
	if (r != ARCHIVE_OK)
	return (r);
	}
	/* Write a zero uncompressed size as the end mark of the series of
	* compressed block. */
	r = __archive_write_filter(f->next_filter, &endmark, sizeof(endmark));
	if (r != ARCHIVE_OK)
	return (r);
	return (__archive_write_close_filter(f->next_filter));
	}

	#else
	static int
	archive_write_lzop_open(struct archive_write_filter *f)
	{
	struct write_lzop data = (struct write_lzop )f->data;
	struct archive_string as;
	int r;

	archive_string_init(&as);
	archive_strcpy(&as, "lzop");
	/* Specify compression level. */
	if (data->compression_level > 0) {
	archive_strappend_char(&as, ' ');
	archive_strappend_char(&as, '-');
	archive_strappend_char(&as, '0' + data->compression_level);
	}

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

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

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

	static int
	archive_write_lzop_close(struct archive_write_filter *f)
	{
	struct write_lzop data = (struct write_lzop )f->data;

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