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/*-
* Copyright (c) 2009-2011 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("$FreeBSD$");
#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. */
char in_stream;
/* Following variables are used for lzip only. */
char lzip_ver;
uint32_t crc32;
int64_t member_in;
int64_t member_out;
};
#if LZMA_VERSION_MAJOR >= 5
/* Effectively disable the limiter. */
#define LZMA_MEMLIMIT UINT64_MAX
#else
/* NOTE: This needs to check memory size which running system has. */
#define LZMA_MEMLIMIT (1U << 30)
#endif
/* Combined lzip/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 *);
static int lzip_has_member(struct archive_read_filter *);
static int lzip_bidder_bid(struct archive_read_filter_bidder *,
struct archive_read_filter *);
static int lzip_bidder_init(struct archive_read_filter *);
#if ARCHIVE_VERSION_NUMBER < 4000000
/* Deprecated; remove in libarchive 4.0 */
int
archive_read_support_compression_xz(struct archive *a)
{
return archive_read_support_filter_xz(a);
}
#endif
int
archive_read_support_filter_xz(struct archive *_a)
{
struct archive_read *a = (struct archive_read *)_a;
struct archive_read_filter_bidder *bidder;
archive_check_magic(_a, ARCHIVE_READ_MAGIC,
ARCHIVE_STATE_NEW, "archive_read_support_filter_xz");
if (__archive_read_get_bidder(a, &bidder) != ARCHIVE_OK)
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
}
#if ARCHIVE_VERSION_NUMBER < 4000000
int
archive_read_support_compression_lzma(struct archive *a)
{
return archive_read_support_filter_lzma(a);
}
#endif
int
archive_read_support_filter_lzma(struct archive *_a)
{
struct archive_read *a = (struct archive_read *)_a;
struct archive_read_filter_bidder *bidder;
archive_check_magic(_a, ARCHIVE_READ_MAGIC,
ARCHIVE_STATE_NEW, "archive_read_support_filter_lzma");
if (__archive_read_get_bidder(a, &bidder) != ARCHIVE_OK)
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
}
#if ARCHIVE_VERSION_NUMBER < 4000000
int
archive_read_support_compression_lzip(struct archive *a)
{
return archive_read_support_filter_lzip(a);
}
#endif
int
archive_read_support_filter_lzip(struct archive *_a)
{
struct archive_read *a = (struct archive_read *)_a;
struct archive_read_filter_bidder *bidder;
archive_check_magic(_a, ARCHIVE_READ_MAGIC,
ARCHIVE_STATE_NEW, "archive_read_support_filter_lzip");
if (__archive_read_get_bidder(a, &bidder) != ARCHIVE_OK)
return (ARCHIVE_FATAL);
bidder->data = NULL;
bidder->bid = lzip_bidder_bid;
bidder->init = lzip_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 lzip program for lzip 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;
(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
*/
if (memcmp(buffer, "\xFD\x37\x7A\x58\x5A\x00", 6) != 0)
return (0);
return (48);
}
/*
* 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;
uint64_t uncompressed_size;
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);
if (uncompressed_size == (uint64_t)ARCHIVE_LITERAL_LL(-1))
bits_checked += 64;
/* 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);
}
static int
lzip_has_member(struct archive_read_filter *filter)
{
const unsigned char *buffer;
ssize_t avail;
int bits_checked;
int log2dic;
buffer = __archive_read_filter_ahead(filter, 6, &avail);
if (buffer == NULL)
return (0);
/*
* Verify Header Magic Bytes : 4C 5A 49 50 (`LZIP')
*/
bits_checked = 0;
if (memcmp(buffer, "LZIP", 4) != 0)
return (0);
bits_checked += 32;
/* A version number must be 0 or 1 */
if (buffer[4] != 0 && buffer[4] != 1)
return (0);
bits_checked += 8;
/* Dictionary size. */
log2dic = buffer[5] & 0x1f;
if (log2dic < 12 || log2dic > 27)
return (0);
bits_checked += 8;
return (bits_checked);
}
static int
lzip_bidder_bid(struct archive_read_filter_bidder *self,
struct archive_read_filter *filter)
{
(void)self; /* UNUSED */
return (lzip_has_member(filter));
}
#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));
}
static int
lzip_bidder_init(struct archive_read_filter *self)
{
self->code = ARCHIVE_COMPRESSION_LZIP;
self->name = "lzip";
return (xz_lzma_bidder_init(self));
}
/*
* Set an error code and choose an error message
*/
static void
set_error(struct archive_read_filter *self, int ret)
{
switch (ret) {
case LZMA_STREAM_END: /* Found end of stream. */
case LZMA_OK: /* Decompressor made some progress. */
break;
case LZMA_MEM_ERROR:
archive_set_error(&self->archive->archive, ENOMEM,
"Lzma library error: Cannot allocate memory");
break;
case LZMA_MEMLIMIT_ERROR:
archive_set_error(&self->archive->archive, ENOMEM,
"Lzma library error: Out of memory");
break;
case LZMA_FORMAT_ERROR:
archive_set_error(&self->archive->archive,
ARCHIVE_ERRNO_MISC,
"Lzma library error: format not recognized");
break;
case LZMA_OPTIONS_ERROR:
archive_set_error(&self->archive->archive,
ARCHIVE_ERRNO_MISC,
"Lzma library error: Invalid options");
break;
case LZMA_DATA_ERROR:
archive_set_error(&self->archive->archive,
ARCHIVE_ERRNO_MISC,
"Lzma library error: Corrupted input data");
break;
case LZMA_BUF_ERROR:
archive_set_error(&self->archive->archive,
ARCHIVE_ERRNO_MISC,
"Lzma library error: No progress is possible");
break;
default:
/* Return an error. */
archive_set_error(&self->archive->archive,
ARCHIVE_ERRNO_MISC,
"Lzma decompression failed: Unknown error");
break;
}
}
/*
* 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;
state->crc32 = 0;
if (self->code == ARCHIVE_COMPRESSION_LZIP) {
/*
* We have to read a lzip header and use it to initialize
* compression library, thus we cannot initialize the
* library for lzip here.
*/
state->in_stream = 0;
return (ARCHIVE_OK);
} else
state->in_stream = 1;
/* Initialize compression library. */
if (self->code == ARCHIVE_COMPRESSION_XZ)
ret = lzma_stream_decoder(&(state->stream),
LZMA_MEMLIMIT,/* memlimit */
LZMA_CONCATENATED);
else
ret = lzma_alone_decoder(&(state->stream),
LZMA_MEMLIMIT);/* memlimit */
if (ret == LZMA_OK)
return (ARCHIVE_OK);
/* Library setup failed: Choose an error message and clean up. */
set_error(self, ret);
free(state->out_block);
free(state);
self->data = NULL;
return (ARCHIVE_FATAL);
}
static int
lzip_init(struct archive_read_filter *self)
{
struct private_data *state;
const unsigned char *h;
lzma_filter filters[2];
unsigned char props[5];
ssize_t avail_in;
uint32_t dicsize;
int log2dic, ret;
state = (struct private_data *)self->data;
h = __archive_read_filter_ahead(self->upstream, 6, &avail_in);
if (h == NULL)
return (ARCHIVE_FATAL);
/* Get a version number. */
state->lzip_ver = h[4];
/*
* Setup lzma property.
*/
props[0] = 0x5d;
/* Get dictionary size. */
log2dic = h[5] & 0x1f;
if (log2dic < 12 || log2dic > 27)
return (ARCHIVE_FATAL);
dicsize = 1U << log2dic;
if (log2dic > 12)
dicsize -= (dicsize / 16) * (h[5] >> 5);
archive_le32enc(props+1, dicsize);
/* Consume lzip header. */
__archive_read_filter_consume(self->upstream, 6);
state->member_in = 6;
filters[0].id = LZMA_FILTER_LZMA1;
filters[0].options = NULL;
filters[1].id = LZMA_VLI_UNKNOWN;
filters[1].options = NULL;
ret = lzma_properties_decode(&filters[0], NULL, props, sizeof(props));
if (ret != LZMA_OK) {
set_error(self, ret);
return (ARCHIVE_FATAL);
}
ret = lzma_raw_decoder(&(state->stream), filters);
#if LZMA_VERSION < 50000030
free(filters[0].options);
#endif
if (ret != LZMA_OK) {
set_error(self, ret);
return (ARCHIVE_FATAL);
}
return (ARCHIVE_OK);
}
static int
lzip_tail(struct archive_read_filter *self)
{
struct private_data *state;
const unsigned char *f;
ssize_t avail_in;
int tail;
state = (struct private_data *)self->data;
if (state->lzip_ver == 0)
tail = 12;
else
tail = 20;
f = __archive_read_filter_ahead(self->upstream, tail, &avail_in);
if (f == NULL && avail_in < 0)
return (ARCHIVE_FATAL);
if (avail_in < tail) {
archive_set_error(&self->archive->archive, ARCHIVE_ERRNO_MISC,
"Lzip: Remaining data is less bytes");
return (ARCHIVE_FAILED);
}
/* Check the crc32 value of the uncompressed data of the current
* member */
if (state->crc32 != archive_le32dec(f)) {
archive_set_error(&self->archive->archive, ARCHIVE_ERRNO_MISC,
"Lzip: CRC32 error");
return (ARCHIVE_FAILED);
}
/* Check the uncompressed size of the current member */
if ((uint64_t)state->member_out != archive_le64dec(f + 4)) {
archive_set_error(&self->archive->archive, ARCHIVE_ERRNO_MISC,
"Lzip: Uncompressed size error");
return (ARCHIVE_FAILED);
}
/* Check the total size of the current member */
if (state->lzip_ver == 1 &&
(uint64_t)state->member_in + tail != archive_le64dec(f + 12)) {
archive_set_error(&self->archive->archive, ARCHIVE_ERRNO_MISC,
"Lzip: Member size error");
return (ARCHIVE_FAILED);
}
__archive_read_filter_consume(self->upstream, tail);
/* If current lzip data consists of multi member, try decompressing
* a next member. */
if (lzip_has_member(self->upstream) != 0) {
state->in_stream = 0;
state->crc32 = 0;
state->member_out = 0;
state->member_in = 0;
state->eof = 0;
}
return (ARCHIVE_OK);
}
/*
* 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) {
if (!state->in_stream) {
/*
* Initialize liblzma for lzip
*/
ret = lzip_init(self);
if (ret != ARCHIVE_OK)
return (ret);
state->in_stream = 1;
}
state->stream.next_in =
__archive_read_filter_ahead(self->upstream, 1, &avail_in);
if (state->stream.next_in == NULL && avail_in < 0) {
archive_set_error(&self->archive->archive,
ARCHIVE_ERRNO_MISC,
"truncated input");
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);
state->member_in +=
avail_in - state->stream.avail_in;
break;
default:
set_error(self, ret);
return (ARCHIVE_FATAL);
}
}
decompressed = state->stream.next_out - state->out_block;
state->total_out += decompressed;
state->member_out += decompressed;
if (decompressed == 0)
*p = NULL;
else {
*p = state->out_block;
if (self->code == ARCHIVE_COMPRESSION_LZIP) {
state->crc32 = lzma_crc32(state->out_block,
decompressed, state->crc32);
if (state->eof) {
ret = lzip_tail(self);
if (ret != ARCHIVE_OK)
return (ret);
}
}
}
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) {
archive_set_error(&self->archive->archive,
ARCHIVE_ERRNO_MISC,
"truncated lzma input");
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_programl(self, "unlzma", "unlzma", NULL);
/* Note: We set the format here even if __archive_read_programl()
* 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_programl(self, "unxz", "unxz", NULL);
/* Note: We set the format here even if __archive_read_programl()
* 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);
}
static int
lzip_bidder_init(struct archive_read_filter *self)
{
int r;
r = __archive_read_programl(self, "unlzip", "unlzip", NULL);
/* Note: We set the format here even if __archive_read_programl()
* above fails. We do, after all, know what the format is
* even if we weren't able to read it. */
self->code = ARCHIVE_COMPRESSION_LZIP;
self->name = "lzip";
return (r);
}
#endif /* HAVE_LZMA_H */
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