archive_read_support_compression_lzma.c [plain text]
#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
#ifdef HAVE_LZMADEC_H
#include <lzmadec.h>
#endif
#include "archive.h"
#include "archive_private.h"
#include "archive_read_private.h"
#if HAVE_LZMADEC_H
struct private_data {
lzmadec_stream stream;
unsigned char *out_block;
size_t out_block_size;
int64_t total_out;
char eof;
};
static ssize_t lzma_source_read(struct archive_read_source *, const void **);
static int lzma_source_close(struct archive_read_source *);
#endif
static int lzma_reader_bid(struct archive_reader *, const void *, size_t);
static struct archive_read_source *lzma_reader_init(struct archive_read *,
struct archive_reader *, struct archive_read_source *,
const void *, size_t);
static int lzma_reader_free(struct archive_reader *);
int
archive_read_support_compression_lzma(struct archive *_a)
{
struct archive_read *a = (struct archive_read *)_a;
struct archive_reader *reader = __archive_read_get_reader(a);
if (reader == NULL)
return (ARCHIVE_FATAL);
reader->data = NULL;
reader->bid = lzma_reader_bid;
reader->init = lzma_reader_init;
reader->free = lzma_reader_free;
return (ARCHIVE_OK);
}
static int
lzma_reader_free(struct archive_reader *self){
(void)self;
return (ARCHIVE_OK);
}
static int
lzma_reader_bid(struct archive_reader *self, const void *buff, size_t len)
{
const unsigned char *buffer;
int bits_checked;
(void)self;
buffer = (const unsigned char *)buff;
if (len < 1)
return (0);
bits_checked = 0;
if (buffer[0] != 0x5d)
return (0);
bits_checked += 8;
if (len < 2)
return (bits_checked);
if (buffer[1] != 0)
return (0);
bits_checked += 8;
if (len < 3)
return (bits_checked);
if (buffer[2] != 0)
return (0);
bits_checked += 8;
#if 0
if (len < 6)
return (bits_checked);
if (buffer[5] != 0)
return (0);
bits_checked += 8;
#endif
return (bits_checked);
}
#ifndef HAVE_LZMADEC_H
static struct archive_read_source *
lzma_reader_init(struct archive_read *a, struct archive_reader *reader,
struct archive_read_source *upstream, const void *buff, size_t n)
{
(void)a;
(void)reader;
(void)upstream;
(void)buff;
(void)n;
archive_set_error(&a->archive, -1,
"This version of libarchive was compiled without lzma support");
return (NULL);
}
#else
static struct archive_read_source *
lzma_reader_init(struct archive_read *a, struct archive_reader *reader,
struct archive_read_source *upstream, const void *buff, size_t n)
{
static const size_t out_block_size = 64 * 1024;
void *out_block;
struct archive_read_source *self;
struct private_data *state;
int ret;
(void)reader;
a->archive.compression_code = ARCHIVE_COMPRESSION_LZMA;
a->archive.compression_name = "lzma";
self = calloc(sizeof(*self), 1);
state = (struct private_data *)calloc(sizeof(*state), 1);
out_block = (unsigned char *)malloc(out_block_size);
if (self == NULL || state == NULL || out_block == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate data for %s decompression",
a->archive.compression_name);
free(out_block);
free(state);
free(self);
return (NULL);
}
self->archive = a;
self->data = state;
state->out_block_size = out_block_size;
state->out_block = out_block;
self->upstream = upstream;
self->read = lzma_source_read;
self->skip = NULL;
self->close = lzma_source_close;
state->stream.next_in = (char *)(uintptr_t)(const void *)buff;
state->stream.avail_in = n;
state->stream.next_out = state->out_block;
state->stream.avail_out = state->out_block_size;
ret = lzmadec_init(&(state->stream));
if (ret == LZMADEC_OK)
return (self);
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Internal error initializing %s library",
a->archive.compression_name);
switch (ret) {
case LZMADEC_HEADER_ERROR:
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Internal error initializing compression library: "
"invalid header");
break;
case LZMADEC_MEM_ERROR:
archive_set_error(&a->archive, ENOMEM,
"Internal error initializing compression library: "
"out of memory");
break;
}
free(state->out_block);
free(state);
free(self);
return (NULL);
}
static ssize_t
lzma_source_read(struct archive_read_source *self, const void **p)
{
struct private_data *state;
size_t read_avail, decompressed;
const void *read_buf;
int ret;
state = (struct private_data *)self->data;
read_avail = 0;
state->stream.next_out = state->out_block;
state->stream.avail_out = state->out_block_size;
for (;;) {
if (state->stream.avail_in == 0) {
ret = (self->upstream->read)(self->upstream,
&read_buf);
state->stream.next_in
= (unsigned char *)(uintptr_t)read_buf;
if (ret < 0)
return (ARCHIVE_FATAL);
if (ret == 0) {
*p = state->out_block;
decompressed = state->stream.next_out
- state->out_block;
state->total_out += decompressed;
return (decompressed);
}
state->stream.avail_in = ret;
}
ret = lzmadec_decode(&(state->stream),
state->stream.avail_in == 0);
switch (ret) {
case LZMADEC_STREAM_END:
state->eof = 1;
case LZMADEC_OK:
if (state->eof || state->stream.avail_out == 0) {
*p = state->out_block;
decompressed = state->stream.next_out
- state->out_block;
state->total_out += decompressed;
return (decompressed);
}
break;
default:
archive_set_error(&self->archive->archive,
ARCHIVE_ERRNO_MISC,
"%s decompression failed",
self->archive->archive.compression_name);
return (ARCHIVE_FATAL);
}
}
}
static int
lzma_source_close(struct archive_read_source *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);
free(self);
return (ret);
}
#endif