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minix/lib/libarchive/archive_read_support_compression_xz.c

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libarchive port by Gautam Tirumala.
2010-07-13 21:17:02 +02:00
/*-
* Copyright (c) 2009 Michihiro NAKAJIMA
* Copyright (c) 2003-2008 Tim Kientzle and Miklos Vajna
* 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_read_support_compression_xz.c 201167 2009-12-29 06:06:20Z 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_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_LZMA_H
#include <lzma.h>
#elif HAVE_LZMADEC_H
#include <lzmadec.h>
#endif
#include "archive.h"
#include "archive_endian.h"
#include "archive_private.h"
#include "archive_read_private.h"
#if HAVE_LZMA_H && HAVE_LIBLZMA
struct private_data {
lzma_stream stream;
unsigned char *out_block;
size_t out_block_size;
int64_t total_out;
char eof; /* True = found end of compressed data. */
};
/* Combined lzma/xz filter */
static ssize_t xz_filter_read(struct archive_read_filter *, const void **);
static int xz_filter_close(struct archive_read_filter *);
static int xz_lzma_bidder_init(struct archive_read_filter *);
#elif HAVE_LZMADEC_H && HAVE_LIBLZMADEC
struct private_data {
lzmadec_stream stream;
unsigned char *out_block;
size_t out_block_size;
int64_t total_out;
char eof; /* True = found end of compressed data. */
};
/* Lzma-only filter */
static ssize_t lzma_filter_read(struct archive_read_filter *, const void **);
static int lzma_filter_close(struct archive_read_filter *);
#endif
/*
* Note that we can detect xz and lzma compressed files even if we
* can't decompress them. (In fact, we like detecting them because we
* can give better error messages.) So the bid framework here gets
* compiled even if no lzma library is available.
*/
static int xz_bidder_bid(struct archive_read_filter_bidder *,
struct archive_read_filter *);
static int xz_bidder_init(struct archive_read_filter *);
static int lzma_bidder_bid(struct archive_read_filter_bidder *,
struct archive_read_filter *);
static int lzma_bidder_init(struct archive_read_filter *);
int
archive_read_support_compression_xz(struct archive *_a)
{
struct archive_read *a = (struct archive_read *)_a;
struct archive_read_filter_bidder *bidder = __archive_read_get_bidder(a);
archive_clear_error(_a);
if (bidder == NULL)
return (ARCHIVE_FATAL);
bidder->data = NULL;
bidder->bid = xz_bidder_bid;
bidder->init = xz_bidder_init;
bidder->options = NULL;
bidder->free = NULL;
#if HAVE_LZMA_H && HAVE_LIBLZMA
return (ARCHIVE_OK);
#else
archive_set_error(_a, ARCHIVE_ERRNO_MISC,
"Using external unxz program for xz decompression");
return (ARCHIVE_WARN);
#endif
}
int
archive_read_support_compression_lzma(struct archive *_a)
{
struct archive_read *a = (struct archive_read *)_a;
struct archive_read_filter_bidder *bidder = __archive_read_get_bidder(a);
archive_clear_error(_a);
if (bidder == NULL)
return (ARCHIVE_FATAL);
bidder->data = NULL;
bidder->bid = lzma_bidder_bid;
bidder->init = lzma_bidder_init;
bidder->options = NULL;
bidder->free = NULL;
#if HAVE_LZMA_H && HAVE_LIBLZMA
return (ARCHIVE_OK);
#elif HAVE_LZMADEC_H && HAVE_LIBLZMADEC
return (ARCHIVE_OK);
#else
archive_set_error(_a, ARCHIVE_ERRNO_MISC,
"Using external unlzma program for lzma decompression");
return (ARCHIVE_WARN);
#endif
}
/*
* Test whether we can handle this data.
*/
static int
xz_bidder_bid(struct archive_read_filter_bidder *self,
struct archive_read_filter *filter)
{
const unsigned char *buffer;
ssize_t avail;
int bits_checked;
(void)self; /* UNUSED */
buffer = __archive_read_filter_ahead(filter, 6, &avail);
if (buffer == NULL)
return (0);
/*
* Verify Header Magic Bytes : FD 37 7A 58 5A 00
*/
bits_checked = 0;
if (buffer[0] != 0xFD)
return (0);
bits_checked += 8;
if (buffer[1] != 0x37)
return (0);
bits_checked += 8;
if (buffer[2] != 0x7A)
return (0);
bits_checked += 8;
if (buffer[3] != 0x58)
return (0);
bits_checked += 8;
if (buffer[4] != 0x5A)
return (0);
bits_checked += 8;
if (buffer[5] != 0x00)
return (0);
bits_checked += 8;
return (bits_checked);
}
/*
* Test whether we can handle this data.
*
* <sigh> LZMA has a rather poor file signature. Zeros do not
* make good signature bytes as a rule, and the only non-zero byte
* here is an ASCII character. For example, an uncompressed tar
* archive whose first file is ']' would satisfy this check. It may
* be necessary to exclude LZMA from compression_all() because of
* this. Clients of libarchive would then have to explicitly enable
* LZMA checking instead of (or in addition to) compression_all() when
* they have other evidence (file name, command-line option) to go on.
*/
static int
lzma_bidder_bid(struct archive_read_filter_bidder *self,
struct archive_read_filter *filter)
{
const unsigned char *buffer;
ssize_t avail;
uint32_t dicsize;
#ifndef __minix
uint64_t uncompressed_size;
#else
u64_t uncompressed_size;
#endif
int bits_checked;
(void)self; /* UNUSED */
buffer = __archive_read_filter_ahead(filter, 14, &avail);
if (buffer == NULL)
return (0);
/* First byte of raw LZMA stream is commonly 0x5d.
* The first byte is a special number, which consists of
* three parameters of LZMA compression, a number of literal
* context bits(which is from 0 to 8, default is 3), a number
* of literal pos bits(which is from 0 to 4, default is 0),
* a number of pos bits(which is from 0 to 4, default is 2).
* The first byte is made by
* (pos bits * 5 + literal pos bit) * 9 + * literal contest bit,
* and so the default value in this field is
* (2 * 5 + 0) * 9 + 3 = 0x5d.
* lzma of LZMA SDK has options to change those parameters.
* It means a range of this field is from 0 to 224. And lzma of
* XZ Utils with option -e records 0x5e in this field. */
/* NOTE: If this checking of the first byte increases false
* recognition, we should allow only 0x5d and 0x5e for the first
* byte of LZMA stream. */
bits_checked = 0;
if (buffer[0] > (4 * 5 + 4) * 9 + 8)
return (0);
/* Most likely value in the first byte of LZMA stream. */
if (buffer[0] == 0x5d || buffer[0] == 0x5e)
bits_checked += 8;
/* Sixth through fourteenth bytes are uncompressed size,
* stored in little-endian order. `-1' means uncompressed
* size is unknown and lzma of XZ Utils always records `-1'
* in this field. */
uncompressed_size = archive_le64dec(buffer+5);
#ifndef __minix
if (uncompressed_size == (uint64_t)ARCHIVE_LITERAL_LL(-1))
bits_checked += 64;
#else
if (cmp64(uncompressed_size, make64(ULONG_MAX, ULONG_MAX)) == 0)
bits_checked += 64;
#endif
/* Second through fifth bytes are dictionary size, stored in
* little-endian order. The minimum dictionary size is
* 1 << 12(4KiB) which the lzma of LZMA SDK uses with option
* -d12 and the maxinam dictionary size is 1 << 27(128MiB)
* which the one uses with option -d27.
* NOTE: A comment of LZMA SDK source code says this dictionary
* range is from 1 << 12 to 1 << 30. */
dicsize = archive_le32dec(buffer+1);
switch (dicsize) {
case 0x00001000:/* lzma of LZMA SDK option -d12. */
case 0x00002000:/* lzma of LZMA SDK option -d13. */
case 0x00004000:/* lzma of LZMA SDK option -d14. */
case 0x00008000:/* lzma of LZMA SDK option -d15. */
case 0x00010000:/* lzma of XZ Utils option -0 and -1.
* lzma of LZMA SDK option -d16. */
case 0x00020000:/* lzma of LZMA SDK option -d17. */
case 0x00040000:/* lzma of LZMA SDK option -d18. */
case 0x00080000:/* lzma of XZ Utils option -2.
* lzma of LZMA SDK option -d19. */
case 0x00100000:/* lzma of XZ Utils option -3.
* lzma of LZMA SDK option -d20. */
case 0x00200000:/* lzma of XZ Utils option -4.
* lzma of LZMA SDK option -d21. */
case 0x00400000:/* lzma of XZ Utils option -5.
* lzma of LZMA SDK option -d22. */
case 0x00800000:/* lzma of XZ Utils option -6.
* lzma of LZMA SDK option -d23. */
case 0x01000000:/* lzma of XZ Utils option -7.
* lzma of LZMA SDK option -d24. */
case 0x02000000:/* lzma of XZ Utils option -8.
* lzma of LZMA SDK option -d25. */
case 0x04000000:/* lzma of XZ Utils option -9.
* lzma of LZMA SDK option -d26. */
case 0x08000000:/* lzma of LZMA SDK option -d27. */
bits_checked += 32;
break;
default:
/* If a memory usage for encoding was not enough on
* the platform where LZMA stream was made, lzma of
* XZ Utils automatically decreased the dictionary
* size to enough memory for encoding by 1Mi bytes
* (1 << 20).*/
if (dicsize <= 0x03F00000 && dicsize >= 0x00300000 &&
(dicsize & ((1 << 20)-1)) == 0 &&
bits_checked == 8 + 64) {
bits_checked += 32;
break;
}
/* Otherwise dictionary size is unlikely. But it is
* possible that someone makes lzma stream with
* liblzma/LZMA SDK in one's dictionary size. */
return (0);
}
/* TODO: The above test is still very weak. It would be
* good to do better. */
return (bits_checked);
}
#if HAVE_LZMA_H && HAVE_LIBLZMA
/*
* liblzma 4.999.7 and later support both lzma and xz streams.
*/
static int
xz_bidder_init(struct archive_read_filter *self)
{
self->code = ARCHIVE_COMPRESSION_XZ;
self->name = "xz";
return (xz_lzma_bidder_init(self));
}
static int
lzma_bidder_init(struct archive_read_filter *self)
{
self->code = ARCHIVE_COMPRESSION_LZMA;
self->name = "lzma";
return (xz_lzma_bidder_init(self));
}
/*
* Setup the callbacks.
*/
static int
xz_lzma_bidder_init(struct archive_read_filter *self)
{
static const size_t out_block_size = 64 * 1024;
void *out_block;
struct private_data *state;
int ret;
state = (struct private_data *)calloc(sizeof(*state), 1);
out_block = (unsigned char *)malloc(out_block_size);
if (state == NULL || out_block == NULL) {
archive_set_error(&self->archive->archive, ENOMEM,
"Can't allocate data for xz decompression");
free(out_block);
free(state);
return (ARCHIVE_FATAL);
}
self->data = state;
state->out_block_size = out_block_size;
state->out_block = out_block;
self->read = xz_filter_read;
self->skip = NULL; /* not supported */
self->close = xz_filter_close;
state->stream.avail_in = 0;
state->stream.next_out = state->out_block;
state->stream.avail_out = state->out_block_size;
/* Initialize compression library.
* TODO: I don't know what value is best for memlimit.
* maybe, it needs to check memory size which
* running system has.
*/
if (self->code == ARCHIVE_COMPRESSION_XZ)
ret = lzma_stream_decoder(&(state->stream),
(1U << 30),/* memlimit */
LZMA_CONCATENATED);
else
ret = lzma_alone_decoder(&(state->stream),
(1U << 30));/* memlimit */
if (ret == LZMA_OK)
return (ARCHIVE_OK);
/* Library setup failed: Choose an error message and clean up. */
switch (ret) {
case LZMA_MEM_ERROR:
archive_set_error(&self->archive->archive, ENOMEM,
"Internal error initializing compression library: "
"Cannot allocate memory");
break;
case LZMA_OPTIONS_ERROR:
archive_set_error(&self->archive->archive,
ARCHIVE_ERRNO_MISC,
"Internal error initializing compression library: "
"Invalid or unsupported options");
break;
default:
archive_set_error(&self->archive->archive, ARCHIVE_ERRNO_MISC,
"Internal error initializing lzma library");
break;
}
free(state->out_block);
free(state);
self->data = NULL;
return (ARCHIVE_FATAL);
}
/*
* Return the next block of decompressed data.
*/
static ssize_t
xz_filter_read(struct archive_read_filter *self, const void **p)
{
struct private_data *state;
size_t decompressed;
ssize_t avail_in;
int ret;
state = (struct private_data *)self->data;
/* Empty our output buffer. */
state->stream.next_out = state->out_block;
state->stream.avail_out = state->out_block_size;
/* Try to fill the output buffer. */
while (state->stream.avail_out > 0 && !state->eof) {
state->stream.next_in =
__archive_read_filter_ahead(self->upstream, 1, &avail_in);
if (state->stream.next_in == NULL && avail_in < 0)
return (ARCHIVE_FATAL);
state->stream.avail_in = avail_in;
/* Decompress as much as we can in one pass. */
ret = lzma_code(&(state->stream),
(state->stream.avail_in == 0)? LZMA_FINISH: LZMA_RUN);
switch (ret) {
case LZMA_STREAM_END: /* Found end of stream. */
state->eof = 1;
/* FALL THROUGH */
case LZMA_OK: /* Decompressor made some progress. */
__archive_read_filter_consume(self->upstream,
avail_in - state->stream.avail_in);
break;
case LZMA_MEM_ERROR:
archive_set_error(&self->archive->archive, ENOMEM,
"Lzma library error: Cannot allocate memory");
return (ARCHIVE_FATAL);
case LZMA_MEMLIMIT_ERROR:
archive_set_error(&self->archive->archive, ENOMEM,
"Lzma library error: Out of memory");
return (ARCHIVE_FATAL);
case LZMA_FORMAT_ERROR:
archive_set_error(&self->archive->archive,
ARCHIVE_ERRNO_MISC,
"Lzma library error: format not recognized");
return (ARCHIVE_FATAL);
case LZMA_OPTIONS_ERROR:
archive_set_error(&self->archive->archive,
ARCHIVE_ERRNO_MISC,
"Lzma library error: Invalid options");
return (ARCHIVE_FATAL);
case LZMA_DATA_ERROR:
archive_set_error(&self->archive->archive,
ARCHIVE_ERRNO_MISC,
"Lzma library error: Corrupted input data");
return (ARCHIVE_FATAL);
case LZMA_BUF_ERROR:
archive_set_error(&self->archive->archive,
ARCHIVE_ERRNO_MISC,
"Lzma library error: No progress is possible");
return (ARCHIVE_FATAL);
default:
/* Return an error. */
archive_set_error(&self->archive->archive,
ARCHIVE_ERRNO_MISC,
"Lzma decompression failed: Unknown error");
return (ARCHIVE_FATAL);
}
}
decompressed = state->stream.next_out - state->out_block;
state->total_out += decompressed;
if (decompressed == 0)
*p = NULL;
else
*p = state->out_block;
return (decompressed);
}
/*
* Clean up the decompressor.
*/
static int
xz_filter_close(struct archive_read_filter *self)
{
struct private_data *state;
state = (struct private_data *)self->data;
lzma_end(&(state->stream));
free(state->out_block);
free(state);
return (ARCHIVE_OK);
}
#else
#if HAVE_LZMADEC_H && HAVE_LIBLZMADEC
/*
* If we have the older liblzmadec library, then we can handle
* LZMA streams but not XZ streams.
*/
/*
* Setup the callbacks.
*/
static int
lzma_bidder_init(struct archive_read_filter *self)
{
static const size_t out_block_size = 64 * 1024;
void *out_block;
struct private_data *state;
ssize_t ret, avail_in;
self->code = ARCHIVE_COMPRESSION_LZMA;
self->name = "lzma";
state = (struct private_data *)calloc(sizeof(*state), 1);
out_block = (unsigned char *)malloc(out_block_size);
if (state == NULL || out_block == NULL) {
archive_set_error(&self->archive->archive, ENOMEM,
"Can't allocate data for lzma decompression");
free(out_block);
free(state);
return (ARCHIVE_FATAL);
}
self->data = state;
state->out_block_size = out_block_size;
state->out_block = out_block;
self->read = lzma_filter_read;
self->skip = NULL; /* not supported */
self->close = lzma_filter_close;
/* Prime the lzma library with 18 bytes of input. */
state->stream.next_in = (unsigned char *)(uintptr_t)
__archive_read_filter_ahead(self->upstream, 18, &avail_in);
if (state->stream.next_in == NULL)
return (ARCHIVE_FATAL);
state->stream.avail_in = avail_in;
state->stream.next_out = state->out_block;
state->stream.avail_out = state->out_block_size;
/* Initialize compression library. */
ret = lzmadec_init(&(state->stream));
__archive_read_filter_consume(self->upstream,
avail_in - state->stream.avail_in);
if (ret == LZMADEC_OK)
return (ARCHIVE_OK);
/* Library setup failed: Clean up. */
archive_set_error(&self->archive->archive, ARCHIVE_ERRNO_MISC,
"Internal error initializing lzma library");
/* Override the error message if we know what really went wrong. */
switch (ret) {
case LZMADEC_HEADER_ERROR:
archive_set_error(&self->archive->archive,
ARCHIVE_ERRNO_MISC,
"Internal error initializing compression library: "
"invalid header");
break;
case LZMADEC_MEM_ERROR:
archive_set_error(&self->archive->archive, ENOMEM,
"Internal error initializing compression library: "
"out of memory");
break;
}
free(state->out_block);
free(state);
self->data = NULL;
return (ARCHIVE_FATAL);
}
/*
* Return the next block of decompressed data.
*/
static ssize_t
lzma_filter_read(struct archive_read_filter *self, const void **p)
{
struct private_data *state;
size_t decompressed;
ssize_t avail_in, ret;
state = (struct private_data *)self->data;
/* Empty our output buffer. */
state->stream.next_out = state->out_block;
state->stream.avail_out = state->out_block_size;
/* Try to fill the output buffer. */
while (state->stream.avail_out > 0 && !state->eof) {
state->stream.next_in = (unsigned char *)(uintptr_t)
__archive_read_filter_ahead(self->upstream, 1, &avail_in);
if (state->stream.next_in == NULL && avail_in < 0)
return (ARCHIVE_FATAL);
state->stream.avail_in = avail_in;
/* Decompress as much as we can in one pass. */
ret = lzmadec_decode(&(state->stream), avail_in == 0);
switch (ret) {
case LZMADEC_STREAM_END: /* Found end of stream. */
state->eof = 1;
/* FALL THROUGH */
case LZMADEC_OK: /* Decompressor made some progress. */
__archive_read_filter_consume(self->upstream,
avail_in - state->stream.avail_in);
break;
case LZMADEC_BUF_ERROR: /* Insufficient input data? */
archive_set_error(&self->archive->archive,
ARCHIVE_ERRNO_MISC,
"Insufficient compressed data");
return (ARCHIVE_FATAL);
default:
/* Return an error. */
archive_set_error(&self->archive->archive,
ARCHIVE_ERRNO_MISC,
"Lzma decompression failed");
return (ARCHIVE_FATAL);
}
}
decompressed = state->stream.next_out - state->out_block;
state->total_out += decompressed;
if (decompressed == 0)
*p = NULL;
else
*p = state->out_block;
return (decompressed);
}
/*
* Clean up the decompressor.
*/
static int
lzma_filter_close(struct archive_read_filter *self)
{
struct private_data *state;
int ret;
state = (struct private_data *)self->data;
ret = ARCHIVE_OK;
switch (lzmadec_end(&(state->stream))) {
case LZMADEC_OK:
break;
default:
archive_set_error(&(self->archive->archive),
ARCHIVE_ERRNO_MISC,
"Failed to clean up %s compressor",
self->archive->archive.compression_name);
ret = ARCHIVE_FATAL;
}
free(state->out_block);
free(state);
return (ret);
}
#else
/*
*
* If we have no suitable library on this system, we can't actually do
* the decompression. We can, however, still detect compressed
* archives and emit a useful message.
*
*/
static int
lzma_bidder_init(struct archive_read_filter *self)
{
int r;
r = __archive_read_program(self, "unlzma");
/* Note: We set the format here even if __archive_read_program()
* above fails. We do, after all, know what the format is
* even if we weren't able to read it. */
self->code = ARCHIVE_COMPRESSION_LZMA;
self->name = "lzma";
return (r);
}
#endif /* HAVE_LZMADEC_H */
static int
xz_bidder_init(struct archive_read_filter *self)
{
int r;
r = __archive_read_program(self, "unxz");
/* Note: We set the format here even if __archive_read_program()
* above fails. We do, after all, know what the format is
* even if we weren't able to read it. */
self->code = ARCHIVE_COMPRESSION_XZ;
self->name = "xz";
return (r);
}
#endif /* HAVE_LZMA_H */
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