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/*
Unix SMB/CIFS implementation.
libndr compression support
Copyright (C) Stefan Metzmacher 2005
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#ifdef HAVE_ZLIB
#include <zlib.h>
static NTSTATUS ndr_pull_compression_zlib(struct ndr_pull *subndr,
struct ndr_pull *comndr,
ssize_t decompressed_len)
{
DATA_BLOB inbuf;
DATA_BLOB outbuf = data_blob_talloc(comndr, NULL, decompressed_len);
uint32_t outbuf_len = outbuf.length;
struct z_stream_s zs;
int ret;
ZERO_STRUCT(zs);
if (subndr->data_size < 10) {
return ndr_pull_error(subndr, NDR_ERR_COMPRESSION, "Bad ZLIB compressed header (PULL) subcontext size %d",
subndr->data_size);
}
inbuf.data = subndr->data+10;
inbuf.length = subndr->data_size-10;
zs.avail_in = inbuf.length;
zs.next_in = inbuf.data;
zs.next_out = outbuf.data;
zs.avail_out = outbuf.length;
ret = inflateInit2(&zs, 15);
if (ret != Z_OK) {
return ndr_pull_error(subndr, NDR_ERR_COMPRESSION, "Bad ZLIB (PULL) inflateInit2 error %d",
ret);
}
while(1) {
ret = inflate(&zs, Z_SYNC_FLUSH);
if (ret == Z_STREAM_END) {
DEBUG(0,("inbuf.length: %d avail_in: %d, avail_out: %d\n", inbuf.length, zs.avail_in, zs.avail_out));
break;
}
if (ret != Z_OK) {
return ndr_pull_error(subndr, NDR_ERR_COMPRESSION, "Bad ZLIB (PULL) inflate error %d",
ret);
}
}
inflateEnd(&zs);
/* TODO: check if the decompressed_len == outbuf_len */
outbuf.length = outbuf_len - zs.avail_out;
if (outbuf.length < 16) {
return ndr_pull_error(subndr, NDR_ERR_COMPRESSION, "Bad ZLIB uncompressed header (PULL) uncompressed size %d",
outbuf.length);
}
outbuf.data += 16;
outbuf.length -= 16;
/* TODO: really decompress the data here */
*comndr = *subndr;
comndr->data = outbuf.data;
comndr->data_size = outbuf.length;
comndr->offset = 0;
return NT_STATUS_OK;
}
static NTSTATUS ndr_push_compression_zlib(struct ndr_push *subndr,
struct ndr_push *comndr)
{
DATA_BLOB inbuf;
DATA_BLOB outbuf = data_blob_talloc(comndr, NULL, comndr->offset + 10);
struct z_stream_s zs;
int ret;
ZERO_STRUCT(zs);
inbuf = ndr_push_blob(comndr);
zs.avail_in = inbuf.length;
zs.next_in = inbuf.data;
zs.next_out = outbuf.data+10;
zs.avail_out = outbuf.length-10;
ret = deflateInit(&zs, Z_DEFAULT_COMPRESSION);
if (ret != Z_OK) {
return ndr_push_error(subndr, NDR_ERR_COMPRESSION, "Bad ZLIB (PUSH) deflateInit2 error %d",
ret);
}
ret = deflate(&zs, Z_SYNC_FLUSH);
if (ret != Z_OK && ret != Z_STREAM_END) {
return ndr_push_error(subndr, NDR_ERR_COMPRESSION, "Bad ZLIB (PULL) deflate error %d",
ret);
}
deflateEnd(&zs);
/* TODO: push the header here */
NDR_CHECK(ndr_push_bytes(subndr, outbuf.data, outbuf.length));
return NT_STATUS_OK;
}
#endif
/*
handle compressed subcontext buffers, which in midl land are user-marshalled, but
we use magic in pidl to make them easier to cope with
*/
NTSTATUS ndr_pull_compression(struct ndr_pull *subndr,
struct ndr_pull *comndr,
enum ndr_compression_alg compression_alg,
ssize_t decompressed_len)
{
comndr->flags = subndr->flags;
switch (compression_alg) {
#ifdef HAVE_ZLIB
case NDR_COMPRESSION_ZLIB:
return ndr_pull_compression_zlib(subndr, comndr, decompressed_len);
#endif
default:
return ndr_pull_error(subndr, NDR_ERR_COMPRESSION, "Bad compression algorithm %d (PULL)",
compression_alg);
}
return NT_STATUS_OK;
}
/*
push a compressed subcontext
*/
NTSTATUS ndr_push_compression(struct ndr_push *subndr,
struct ndr_push *comndr,
enum ndr_compression_alg compression_alg)
{
comndr->flags = subndr->flags;
switch (compression_alg) {
#ifdef HAVE_ZLIB
case NDR_COMPRESSION_ZLIB:
return ndr_push_compression_zlib(subndr, comndr);
#endif
default:
return ndr_push_error(subndr, NDR_ERR_COMPRESSION, "Bad compression algorithm %d (PUSH)",
compression_alg);
}
return NT_STATUS_OK;
}
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