/
ostream-lzma.c
249 lines (209 loc) · 6.15 KB
/
ostream-lzma.c
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/* Copyright (c) 2010-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#ifdef HAVE_LZMA
#include "ostream-private.h"
#include "ostream-zlib.h"
#include <lzma.h>
#define CHUNK_SIZE (1024*64)
struct lzma_ostream {
struct ostream_private ostream;
lzma_stream strm;
unsigned char outbuf[CHUNK_SIZE];
unsigned int outbuf_offset, outbuf_used;
bool flushed:1;
};
static void o_stream_lzma_close(struct iostream_private *stream,
bool close_parent)
{
struct lzma_ostream *zstream = (struct lzma_ostream *)stream;
lzma_end(&zstream->strm);
if (close_parent)
o_stream_close(zstream->ostream.parent);
}
static int o_stream_zlib_send_outbuf(struct lzma_ostream *zstream)
{
ssize_t ret;
size_t size;
if (zstream->outbuf_used == 0)
return 1;
size = zstream->outbuf_used - zstream->outbuf_offset;
i_assert(size > 0);
ret = o_stream_send(zstream->ostream.parent,
zstream->outbuf + zstream->outbuf_offset, size);
if (ret < 0) {
o_stream_copy_error_from_parent(&zstream->ostream);
return -1;
}
if ((size_t)ret != size) {
zstream->outbuf_offset += ret;
return 0;
}
zstream->outbuf_offset = 0;
zstream->outbuf_used = 0;
return 1;
}
static ssize_t
o_stream_lzma_send_chunk(struct lzma_ostream *zstream,
const void *data, size_t size)
{
lzma_stream *zs = &zstream->strm;
int ret;
i_assert(zstream->outbuf_used == 0);
zs->next_in = (void *)data;
zs->avail_in = size;
while (zs->avail_in > 0) {
if (zs->avail_out == 0) {
/* previous block was compressed. send it and start
compression for a new block. */
zs->next_out = zstream->outbuf;
zs->avail_out = sizeof(zstream->outbuf);
zstream->outbuf_used = sizeof(zstream->outbuf);
if ((ret = o_stream_zlib_send_outbuf(zstream)) < 0)
return -1;
if (ret == 0) {
/* parent stream's buffer full */
break;
}
}
ret = lzma_code(zs, LZMA_RUN);
switch (ret) {
case LZMA_OK:
break;
case LZMA_MEM_ERROR:
i_fatal_status(FATAL_OUTOFMEM,
"lzma.write(%s): Out of memory",
o_stream_get_name(&zstream->ostream.ostream));
default:
i_panic("lzma.write(%s) failed with unexpected code %d",
o_stream_get_name(&zstream->ostream.ostream), ret);
}
}
size -= zs->avail_in;
zstream->flushed = FALSE;
return size;
}
static int o_stream_lzma_send_flush(struct lzma_ostream *zstream)
{
lzma_stream *zs = &zstream->strm;
size_t len;
bool done = FALSE;
int ret;
i_assert(zs->avail_in == 0);
if (zstream->flushed)
return 0;
if ((ret = o_stream_flush_parent_if_needed(&zstream->ostream)) <= 0)
return ret;
if ((ret = o_stream_zlib_send_outbuf(zstream)) <= 0)
return ret;
i_assert(zstream->outbuf_used == 0);
do {
ret = lzma_code(zs, LZMA_FINISH);
switch (ret) {
case LZMA_OK:
break;
case LZMA_STREAM_END:
done = TRUE;
break;
case LZMA_MEM_ERROR:
i_fatal_status(FATAL_OUTOFMEM,
"lzma.write(%s): Out of memory",
o_stream_get_name(&zstream->ostream.ostream));
default:
i_panic("lzma.write(%s) flush failed with unexpected code %d",
o_stream_get_name(&zstream->ostream.ostream), ret);
}
if (zs->avail_out == 0 || done) {
len = sizeof(zstream->outbuf) - zs->avail_out;
zs->next_out = zstream->outbuf;
zs->avail_out = sizeof(zstream->outbuf);
zstream->outbuf_used = len;
if ((ret = o_stream_zlib_send_outbuf(zstream)) <= 0)
return ret;
}
} while (!done);
zstream->flushed = TRUE;
return 0;
}
static int o_stream_lzma_flush(struct ostream_private *stream)
{
struct lzma_ostream *zstream = (struct lzma_ostream *)stream;
if (o_stream_lzma_send_flush(zstream) < 0)
return -1;
return o_stream_flush_parent(stream);
}
static size_t
o_stream_lzma_get_buffer_used_size(const struct ostream_private *stream)
{
const struct lzma_ostream *zstream =
(const struct lzma_ostream *)stream;
/* outbuf has already compressed data that we're trying to send to the
parent stream. We're not including lzma's internal compression
buffer size. */
return (zstream->outbuf_used - zstream->outbuf_offset) +
o_stream_get_buffer_used_size(stream->parent);
}
static size_t
o_stream_lzma_get_buffer_avail_size(const struct ostream_private *stream)
{
/* FIXME: not correct - this is counting compressed size, which may be
too larger than uncompressed size in some situations. Fixing would
require some kind of additional buffering. */
return o_stream_get_buffer_avail_size(stream->parent);
}
static ssize_t
o_stream_lzma_sendv(struct ostream_private *stream,
const struct const_iovec *iov, unsigned int iov_count)
{
struct lzma_ostream *zstream = (struct lzma_ostream *)stream;
ssize_t ret, bytes = 0;
unsigned int i;
if ((ret = o_stream_zlib_send_outbuf(zstream)) <= 0) {
/* error / we still couldn't flush existing data to
parent stream. */
return ret;
}
for (i = 0; i < iov_count; i++) {
ret = o_stream_lzma_send_chunk(zstream, iov[i].iov_base,
iov[i].iov_len);
if (ret < 0)
return -1;
bytes += ret;
if ((size_t)ret != iov[i].iov_len)
break;
}
stream->ostream.offset += bytes;
/* avail_in!=0 check is used to detect errors. if it's non-zero here
it simply means we didn't send all the data */
zstream->strm.avail_in = 0;
return bytes;
}
struct ostream *o_stream_create_lzma(struct ostream *output, int level)
{
struct lzma_ostream *zstream;
lzma_ret ret;
i_assert(level >= 1 && level <= 9);
zstream = i_new(struct lzma_ostream, 1);
zstream->ostream.sendv = o_stream_lzma_sendv;
zstream->ostream.flush = o_stream_lzma_flush;
zstream->ostream.get_buffer_used_size =
o_stream_lzma_get_buffer_used_size;
zstream->ostream.get_buffer_avail_size =
o_stream_lzma_get_buffer_avail_size;
zstream->ostream.iostream.close = o_stream_lzma_close;
ret = lzma_easy_encoder(&zstream->strm, level, LZMA_CHECK_CRC64);
switch (ret) {
case LZMA_OK:
break;
case LZMA_MEM_ERROR:
i_fatal_status(FATAL_OUTOFMEM, "lzma: Out of memory");
case LZMA_OPTIONS_ERROR:
i_fatal("lzma: Invalid level");
default:
i_fatal("lzma_easy_encoder() failed with %d", ret);
}
zstream->strm.next_out = zstream->outbuf;
zstream->strm.avail_out = sizeof(zstream->outbuf);
return o_stream_create(&zstream->ostream, output,
o_stream_get_fd(output));
}
#endif