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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"
#include "lib/compression/mszip.h"
static NTSTATUS ndr_pull_compression_mszip_chunk(struct ndr_pull *ndrpull,
struct ndr_push *ndrpush,
struct decomp_state *decomp_state)
{
DATA_BLOB comp_chunk;
uint32_t comp_chunk_offset;
uint32_t comp_chunk_size;
DATA_BLOB plain_chunk;
uint32_t plain_chunk_offset;
uint32_t plain_chunk_size;
int ret;
NDR_CHECK(ndr_pull_uint32(ndrpull, NDR_SCALARS, &plain_chunk_size));
if (plain_chunk_size > 0x00008000) {
return ndr_pull_error(ndrpull, NDR_ERR_COMPRESSION, "Bad ZLIB plain chunk size %08X > 0x00008000 (PULL)",
plain_chunk_size);
}
NDR_CHECK(ndr_pull_uint32(ndrpull, NDR_SCALARS, &comp_chunk_size));
DEBUG(10,("plain_chunk_size: %08X (%u) comp_chunk_size: %08X (%u)\n",
plain_chunk_size, plain_chunk_size, comp_chunk_size, comp_chunk_size));
comp_chunk_offset = ndrpull->offset;
NDR_CHECK(ndr_pull_advance(ndrpull, comp_chunk_size));
comp_chunk.length = comp_chunk_size;
comp_chunk.data = ndrpull->data + comp_chunk_offset;
plain_chunk_offset = ndrpush->offset;
NDR_CHECK(ndr_push_zero(ndrpush, plain_chunk_size));
plain_chunk.length = plain_chunk_size;
plain_chunk.data = ndrpush->data + plain_chunk_offset;
ret = ZIPdecompress(decomp_state, &comp_chunk, &plain_chunk);
if (ret != DECR_OK) {
return ndr_pull_error(ndrpull, NDR_ERR_COMPRESSION, "Bad ZIBdecompress() error %d (PULL)",
ret);
}
if ((plain_chunk_size < 0x00008000) || (ndrpull->offset+4 >= ndrpull->data_size)) {
/* this is the last chunk */
return NT_STATUS_OK;
}
return NT_STATUS_MORE_PROCESSING_REQUIRED;
}
static NTSTATUS ndr_pull_compression_mszip(struct ndr_pull *subndr,
struct ndr_pull *comndr,
ssize_t decompressed_len)
{
NTSTATUS status = NT_STATUS_MORE_PROCESSING_REQUIRED;
struct ndr_push *ndrpush;
DATA_BLOB uncompressed;
uint32_t payload_header[4];
uint32_t payload_size;
uint32_t payload_offset;
uint8_t *payload;
struct decomp_state *decomp_state;
ndrpush = ndr_push_init_ctx(subndr);
NT_STATUS_HAVE_NO_MEMORY(ndrpush);
decomp_state = ZIPdecomp_state(subndr);
NT_STATUS_HAVE_NO_MEMORY(decomp_state);
while (NT_STATUS_EQUAL(NT_STATUS_MORE_PROCESSING_REQUIRED, status)) {
status = ndr_pull_compression_mszip_chunk(subndr, ndrpush, decomp_state);
}
NT_STATUS_NOT_OK_RETURN(status);
uncompressed = ndr_push_blob(ndrpush);
if (uncompressed.length != decompressed_len) {
return ndr_pull_error(subndr, NDR_ERR_COMPRESSION, "Bad uncompressed_len [%u] != [%d] (PULL)",
uncompressed.length, decompressed_len);
}
*comndr = *subndr;
comndr->data = uncompressed.data;
comndr->data_size = uncompressed.length;
comndr->offset = 0;
NDR_CHECK(ndr_pull_uint32(comndr, NDR_SCALARS, &payload_header[0]));
NDR_CHECK(ndr_pull_uint32(comndr, NDR_SCALARS, &payload_header[1]));
NDR_CHECK(ndr_pull_uint32(comndr, NDR_SCALARS, &payload_header[2]));
NDR_CHECK(ndr_pull_uint32(comndr, NDR_SCALARS, &payload_header[3]));
payload_size = payload_header[2];
/* TODO: check the first 4 bytes of the header */
if (payload_header[1] != 0xCCCCCCCC) {
return ndr_pull_error(subndr, NDR_ERR_COMPRESSION, "Bad payload_header[1] [0x%08X] != [0xCCCCCCCC] (PULL)",
payload_header[1]);
}
payload_offset = comndr->offset;
NDR_CHECK(ndr_pull_advance(comndr, payload_size));
payload = comndr->data + payload_offset;
comndr->data = payload;
comndr->data_size = payload_size;
comndr->offset = 0;
return NT_STATUS_OK;
}
static NTSTATUS ndr_push_compression_mszip(struct ndr_push *subndr,
struct ndr_push *comndr)
{
return ndr_push_error(subndr, NDR_ERR_COMPRESSION, "Bad MSZIP compression is not supported yet (PUSH)");
}
/*
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) {
case NDR_COMPRESSION_MSZIP:
return ndr_pull_compression_mszip(subndr, comndr, decompressed_len);
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) {
case NDR_COMPRESSION_MSZIP:
return ndr_push_compression_mszip(subndr, comndr);
default:
return ndr_push_error(subndr, NDR_ERR_COMPRESSION, "Bad compression algorithm %d (PUSH)",
compression_alg);
}
return NT_STATUS_OK;
}
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