diff options
Diffstat (limited to 'source4/librpc/ndr/ndr_compression.c')
| -rw-r--r-- | source4/librpc/ndr/ndr_compression.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/source4/librpc/ndr/ndr_compression.c b/source4/librpc/ndr/ndr_compression.c new file mode 100644 index 0000000000..d4f1a2a927 --- /dev/null +++ b/source4/librpc/ndr/ndr_compression.c @@ -0,0 +1,177 @@ +/* + 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; +} |