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/* Copyright (c) 2020 Dovecot authors, see the included COPYING file */
#include "lib.h"
#ifdef HAVE_ZSTD
#include "ostream.h"
#include "ostream-private.h"
#include "ostream-zlib.h"
#include "zstd.h"
#include "zstd_errors.h"
#include "iostream-zstd-private.h"
struct zstd_ostream {
struct ostream_private ostream;
ZSTD_CStream *cstream;
ZSTD_outBuffer output;
unsigned char *outbuf;
bool flushed:1;
bool closed:1;
bool finished:1;
};
int compression_get_min_level_zstd(void)
{
#if HAVE_DECL_ZSTD_MINCLEVEL == 1
return ZSTD_minCLevel();
#else
return 1;
#endif
}
int compression_get_default_level_zstd(void)
{
#ifdef ZSTD_CLEVEL_DEFAULT
return ZSTD_CLEVEL_DEFAULT;
#else
/* Documentation says 3 is default */
return 3;
#endif
}
int compression_get_max_level_zstd(void)
{
return ZSTD_maxCLevel();
}
static void o_stream_zstd_write_error(struct zstd_ostream *zstream, size_t err)
{
ZSTD_ErrorCode errcode = zstd_version_errcode(ZSTD_getErrorCode(err));
const char *error = ZSTD_getErrorName(err);
if (errcode == ZSTD_error_memory_allocation)
i_fatal_status(FATAL_OUTOFMEM, "zstd.write(%s): Out of memory",
o_stream_get_name(&zstream->ostream.ostream));
else if (errcode == ZSTD_error_prefix_unknown ||
#if HAVE_DECL_ZSTD_ERROR_PARAMETER_UNSUPPORTED == 1
errcode == ZSTD_error_parameter_unsupported ||
#endif
errcode == ZSTD_error_dictionary_wrong ||
errcode == ZSTD_error_init_missing)
zstream->ostream.ostream.stream_errno = EINVAL;
else
zstream->ostream.ostream.stream_errno = EIO;
io_stream_set_error(&zstream->ostream.iostream,
"zstd.write(%s): %s at %"PRIuUOFF_T,
o_stream_get_name(&zstream->ostream.ostream), error,
zstream->ostream.ostream.offset);
}
static ssize_t o_stream_zstd_send_outbuf(struct zstd_ostream *zstream)
{
ssize_t ret;
/* nothing to send */
if (zstream->output.pos == 0)
return 1;
ret = o_stream_send(zstream->ostream.parent, zstream->output.dst,
zstream->output.pos);
if (ret < 0) {
o_stream_copy_error_from_parent(&zstream->ostream);
return -1;
} else {
memmove(zstream->outbuf, zstream->outbuf+ret, zstream->output.pos-ret);
zstream->output.pos -= ret;
}
if (zstream->output.pos > 0)
return 0;
return 1;
}
static ssize_t
o_stream_zstd_sendv(struct ostream_private *stream,
const struct const_iovec *iov, unsigned int iov_count)
{
struct zstd_ostream *zstream =
container_of(stream, struct zstd_ostream, ostream);
ssize_t total = 0;
size_t ret;
for (unsigned int i = 0; i < iov_count; i++) {
/* does it actually fit there */
ZSTD_inBuffer input = {
.src = iov[i].iov_base,
.pos = 0,
.size = iov[i].iov_len
};
bool flush_attempted = FALSE;
for (;;) {
size_t prev_pos = input.pos;
ret = ZSTD_compressStream(zstream->cstream, &zstream->output,
&input);
if (ZSTD_isError(ret) != 0) {
o_stream_zstd_write_error(zstream, ret);
return -1;
}
size_t new_input_size = input.pos - prev_pos;
if (new_input_size == 0 && flush_attempted) {
/* non-blocking output buffer full */
return total;
}
stream->ostream.offset += new_input_size;
total += new_input_size;
if (input.pos == input.size)
break;
/* output buffer full. try to flush it. */
if (o_stream_zstd_send_outbuf(zstream) < 0)
return -1;
flush_attempted = TRUE;
}
}
if (o_stream_zstd_send_outbuf(zstream) < 0)
return -1;
return total;
}
static int o_stream_zstd_send_flush(struct zstd_ostream *zstream, bool final)
{
int ret;
if (zstream->flushed) {
i_assert(zstream->output.pos == 0);
return 1;
}
if ((ret = o_stream_flush_parent_if_needed(&zstream->ostream)) <= 0)
return ret;
if (zstream->output.pos == 0)
ZSTD_flushStream(zstream->cstream, &zstream->output);
if ((ret = o_stream_zstd_send_outbuf(zstream)) <= 0)
return ret;
if (!final)
return 1;
if (!zstream->finished) {
ret = ZSTD_endStream(zstream->cstream, &zstream->output);
if (ZSTD_isError(ret) != 0) {
o_stream_zstd_write_error(zstream, ret);
return -1;
}
zstream->finished = TRUE;
}
if ((ret = o_stream_zstd_send_outbuf(zstream)) <= 0)
return ret;
if (final)
zstream->flushed = TRUE;
i_assert(zstream->output.pos == 0);
return 1;
}
static int o_stream_zstd_flush(struct ostream_private *stream)
{
struct zstd_ostream *zstream =
container_of(stream, struct zstd_ostream, ostream);
int ret;
if ((ret = o_stream_zstd_send_flush(zstream, stream->finished)) < 0)
return -1;
else if (ret > 0)
return o_stream_flush_parent(stream);
return ret;
}
static void o_stream_zstd_close(struct iostream_private *stream,
bool close_parent)
{
struct ostream_private *_ostream =
container_of(stream, struct ostream_private, iostream);
struct zstd_ostream *zstream =
container_of(_ostream, struct zstd_ostream, ostream);
i_assert(zstream->ostream.finished ||
zstream->ostream.ostream.stream_errno != 0 ||
zstream->ostream.error_handling_disabled);
if (zstream->cstream != NULL) {
ZSTD_freeCStream(zstream->cstream);
zstream->cstream = NULL;
}
i_free(zstream->outbuf);
i_zero(&zstream->output);
if (close_parent)
o_stream_close(zstream->ostream.parent);
}
struct ostream *
o_stream_create_zstd(struct ostream *output, int level)
{
struct zstd_ostream *zstream;
size_t ret;
i_assert(level >= compression_get_min_level_zstd() &&
level <= compression_get_max_level_zstd());
zstd_version_check();
zstream = i_new(struct zstd_ostream, 1);
zstream->ostream.sendv = o_stream_zstd_sendv;
zstream->ostream.flush = o_stream_zstd_flush;
zstream->ostream.iostream.close = o_stream_zstd_close;
zstream->cstream = ZSTD_createCStream();
if (zstream->cstream == NULL)
i_fatal_status(FATAL_OUTOFMEM, "zstd: Out of memory");
ret = ZSTD_initCStream(zstream->cstream, level);
if (ZSTD_isError(ret) != 0)
o_stream_zstd_write_error(zstream, ret);
else {
zstream->outbuf = i_malloc(ZSTD_CStreamOutSize());
zstream->output.dst = zstream->outbuf;
zstream->output.size = ZSTD_CStreamOutSize();
}
return o_stream_create(&zstream->ostream, output,
o_stream_get_fd(output));
}
#endif
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