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/* Copyright (c) 2010-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#ifdef HAVE_LZMA
#include "istream-private.h"
#include "istream-zlib.h"
#include <lzma.h>
#define CHUNK_SIZE (1024*64)
#define LZMA_MEMORY_LIMIT (1024*1024*80)
struct lzma_istream {
struct istream_private istream;
lzma_stream strm;
uoff_t eof_offset;
struct stat last_parent_statbuf;
bool hdr_read:1;
bool marked:1;
bool strm_closed:1;
};
static void i_stream_lzma_close(struct iostream_private *stream,
bool close_parent)
{
struct lzma_istream *zstream = (struct lzma_istream *)stream;
if (!zstream->strm_closed) {
lzma_end(&zstream->strm);
zstream->strm_closed = TRUE;
}
if (close_parent)
i_stream_close(zstream->istream.parent);
}
static void lzma_read_error(struct lzma_istream *zstream, const char *error)
{
io_stream_set_error(&zstream->istream.iostream,
"lzma.read(%s): %s at %"PRIuUOFF_T,
i_stream_get_name(&zstream->istream.istream), error,
i_stream_get_absolute_offset(&zstream->istream.istream));
}
static int lzma_handle_error(struct lzma_istream *zstream, lzma_ret lzma_err)
{
struct istream_private *stream = &zstream->istream;
switch (lzma_err) {
case LZMA_OK:
break;
case LZMA_DATA_ERROR:
case LZMA_BUF_ERROR:
lzma_read_error(zstream, "corrupted data");
stream->istream.stream_errno = EINVAL;
return -1;
case LZMA_FORMAT_ERROR:
lzma_read_error(zstream, "wrong magic in header (not xz file?)");
stream->istream.stream_errno = EINVAL;
return -1;
case LZMA_OPTIONS_ERROR:
lzma_read_error(zstream, "Unsupported xz options");
stream->istream.stream_errno = EIO;
return -1;
case LZMA_MEM_ERROR:
i_fatal_status(FATAL_OUTOFMEM, "lzma.read(%s): Out of memory",
i_stream_get_name(&stream->istream));
case LZMA_STREAM_END:
break;
default:
lzma_read_error(zstream, t_strdup_printf(
"lzma_code() failed with %d", lzma_err));
stream->istream.stream_errno = EIO;
return -1;
}
return 0;
}
static void lzma_stream_end(struct lzma_istream *zstream)
{
zstream->eof_offset = zstream->istream.istream.v_offset +
(zstream->istream.pos - zstream->istream.skip);
zstream->istream.cached_stream_size = zstream->eof_offset;
}
static ssize_t i_stream_lzma_read(struct istream_private *stream)
{
struct lzma_istream *zstream = (struct lzma_istream *)stream;
const unsigned char *data;
uoff_t high_offset;
size_t size, out_size;
lzma_ret ret;
high_offset = stream->istream.v_offset + (stream->pos - stream->skip);
if (zstream->eof_offset == high_offset) {
stream->istream.eof = TRUE;
return -1;
}
if (!zstream->marked) {
if (!i_stream_try_alloc(stream, CHUNK_SIZE, &out_size))
return -2; /* buffer full */
} else {
/* try to avoid compressing, so we can quickly seek backwards */
if (!i_stream_try_alloc_avoid_compress(stream, CHUNK_SIZE, &out_size))
return -2; /* buffer full */
}
if (i_stream_read_more(stream->parent, &data, &size) < 0) {
if (stream->parent->stream_errno != 0) {
stream->istream.stream_errno =
stream->parent->stream_errno;
} else {
i_assert(stream->parent->eof);
lzma_stream_end(zstream);
ret = lzma_code(&zstream->strm, LZMA_FINISH);
if (lzma_handle_error(zstream, ret) < 0)
;
else if (!zstream->hdr_read) {
lzma_read_error(zstream, "file too small (not xz file?)");
stream->istream.stream_errno = EINVAL;
} else if (ret != LZMA_STREAM_END) {
lzma_read_error(zstream, "unexpected EOF");
stream->istream.stream_errno = EPIPE;
}
stream->istream.eof = TRUE;
}
return -1;
}
if (size == 0) {
/* no more input */
i_assert(!stream->istream.blocking);
return 0;
}
zstream->strm.next_in = data;
zstream->strm.avail_in = size;
zstream->strm.next_out = stream->w_buffer + stream->pos;
zstream->strm.avail_out = out_size;
if (!zstream->hdr_read && size > LZMA_STREAM_HEADER_SIZE)
zstream->hdr_read = TRUE;
ret = lzma_code(&zstream->strm, LZMA_RUN);
out_size -= zstream->strm.avail_out;
stream->pos += out_size;
size_t bytes_consumed = size - zstream->strm.avail_in;
i_stream_skip(stream->parent, bytes_consumed);
if (i_stream_get_data_size(stream->parent) > 0 &&
(bytes_consumed > 0 || out_size > 0)) {
/* Parent stream was only partially consumed. Set the stream's
IO as pending to avoid hangs. */
i_stream_set_input_pending(&stream->istream, TRUE);
}
if (lzma_handle_error(zstream, ret) < 0) {
return -1;
} else if (ret == LZMA_STREAM_END) {
lzma_stream_end(zstream);
if (out_size == 0) {
stream->istream.eof = TRUE;
return -1;
}
}
if (out_size == 0) {
/* read more input */
return i_stream_lzma_read(stream);
}
return out_size;
}
static void i_stream_lzma_init(struct lzma_istream *zstream)
{
lzma_ret ret;
ret = lzma_stream_decoder(&zstream->strm, LZMA_MEMORY_LIMIT,
LZMA_CONCATENATED);
switch (ret) {
case LZMA_OK:
break;
case LZMA_MEM_ERROR:
i_fatal_status(FATAL_OUTOFMEM, "lzma: Out of memory");
default:
i_fatal("lzma_stream_decoder() failed with ret=%d", ret);
}
}
static void i_stream_lzma_reset(struct lzma_istream *zstream)
{
struct istream_private *stream = &zstream->istream;
i_stream_seek(stream->parent, stream->parent_start_offset);
zstream->eof_offset = UOFF_T_MAX;
zstream->strm.next_in = NULL;
zstream->strm.avail_in = 0;
stream->parent_expected_offset = stream->parent_start_offset;
stream->skip = stream->pos = 0;
stream->istream.v_offset = 0;
lzma_end(&zstream->strm);
i_stream_lzma_init(zstream);
}
static void
i_stream_lzma_seek(struct istream_private *stream, uoff_t v_offset, bool mark)
{
struct lzma_istream *zstream = (struct lzma_istream *) stream;
if (i_stream_nonseekable_try_seek(stream, v_offset))
return;
/* have to seek backwards - reset state and retry */
i_stream_lzma_reset(zstream);
if (!i_stream_nonseekable_try_seek(stream, v_offset))
i_unreached();
if (mark)
zstream->marked = TRUE;
}
static void i_stream_lzma_sync(struct istream_private *stream)
{
struct lzma_istream *zstream = (struct lzma_istream *) stream;
const struct stat *st;
if (i_stream_stat(stream->parent, FALSE, &st) == 0) {
if (memcmp(&zstream->last_parent_statbuf,
st, sizeof(*st)) == 0) {
/* a compressed file doesn't change unexpectedly,
don't clear our caches unnecessarily */
return;
}
zstream->last_parent_statbuf = *st;
}
i_stream_lzma_reset(zstream);
}
struct istream *i_stream_create_lzma(struct istream *input)
{
struct lzma_istream *zstream;
zstream = i_new(struct lzma_istream, 1);
zstream->eof_offset = UOFF_T_MAX;
i_stream_lzma_init(zstream);
zstream->istream.iostream.close = i_stream_lzma_close;
zstream->istream.max_buffer_size = input->real_stream->max_buffer_size;
zstream->istream.read = i_stream_lzma_read;
zstream->istream.seek = i_stream_lzma_seek;
zstream->istream.sync = i_stream_lzma_sync;
zstream->istream.istream.readable_fd = FALSE;
zstream->istream.istream.blocking = input->blocking;
zstream->istream.istream.seekable = input->seekable;
return i_stream_create(&zstream->istream, input,
i_stream_get_fd(input), 0);
}
#endif
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