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authorStefan Metzmacher <metze@samba.org>2008-08-07 16:24:57 +0000
committerStefan Metzmacher <metze@samba.org>2008-08-18 15:29:02 +0200
commit6cd8e2bccf2023833f679963244f56ca6854eb66 (patch)
tree49c642d89671fee26c2bea1d1084c4bca73fc4e6 /source4/librpc/ndr
parent7474196d837eb6f9c8e6f26cd649cbb638fd34d8 (diff)
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ndr_compression: use zlib's inflate() for decompression
metze (This used to be commit 25876fc4ab8ba11f00d24bb8ceb517c0e4a4d72d)
Diffstat (limited to 'source4/librpc/ndr')
-rw-r--r--source4/librpc/ndr/ndr_compression.c92
1 files changed, 81 insertions, 11 deletions
diff --git a/source4/librpc/ndr/ndr_compression.c b/source4/librpc/ndr/ndr_compression.c
index ffa37f61a3..7c2aca72e9 100644
--- a/source4/librpc/ndr/ndr_compression.c
+++ b/source4/librpc/ndr/ndr_compression.c
@@ -21,14 +21,24 @@
*/
#include "includes.h"
-#include "lib/compression/mszip.h"
#include "lib/compression/lzxpress.h"
#include "librpc/ndr/libndr.h"
#include "librpc/ndr/ndr_compression.h"
+#include <zlib.h>
+
+static voidpf ndr_zlib_alloc(voidpf opaque, uInt items, uInt size)
+{
+ return talloc_zero_size(opaque, items * size);
+}
+
+static void ndr_zlib_free(voidpf opaque, voidpf address)
+{
+ talloc_free(address);
+}
static enum ndr_err_code ndr_pull_compression_mszip_chunk(struct ndr_pull *ndrpull,
struct ndr_push *ndrpush,
- struct decomp_state *decomp_state,
+ z_stream *z,
bool *last)
{
DATA_BLOB comp_chunk;
@@ -37,7 +47,7 @@ static enum ndr_err_code ndr_pull_compression_mszip_chunk(struct ndr_pull *ndrpu
DATA_BLOB plain_chunk;
uint32_t plain_chunk_offset;
uint32_t plain_chunk_size;
- int ret;
+ int z_ret;
NDR_CHECK(ndr_pull_uint32(ndrpull, NDR_SCALARS, &plain_chunk_size));
if (plain_chunk_size > 0x00008000) {
@@ -60,10 +70,71 @@ static enum ndr_err_code ndr_pull_compression_mszip_chunk(struct ndr_pull *ndrpu
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 ZIPdecompress() error %d (PULL)",
- ret);
+ if (comp_chunk.length < 2) {
+ return ndr_pull_error(ndrpull, NDR_ERR_COMPRESSION,
+ "Bad MSZIP comp chunk size %u < 2 (PULL)",
+ (unsigned int)comp_chunk.length);
+ }
+ /* CK = Chris Kirmse, official Microsoft purloiner */
+ if (comp_chunk.data[0] != 'C' ||
+ comp_chunk.data[1] != 'K') {
+ return ndr_pull_error(ndrpull, NDR_ERR_COMPRESSION,
+ "Bad MSZIP invalid prefix [%c%c] != [CK]",
+ comp_chunk.data[0], comp_chunk.data[1]);
+ }
+
+ z->next_in = comp_chunk.data + 2;
+ z->avail_in = comp_chunk.length -2;
+ z->total_in = 0;
+
+ z->next_out = plain_chunk.data;
+ z->avail_out = plain_chunk.length;
+ z->total_out = 0;
+
+ if (!z->opaque) {
+ /* the first time we need to intialize completely */
+ z->zalloc = ndr_zlib_alloc;
+ z->zfree = ndr_zlib_free;
+ z->opaque = ndrpull;
+
+ z_ret = inflateInit2(z, -15);
+ if (z_ret != Z_OK) {
+ return ndr_pull_error(ndrpull, NDR_ERR_COMPRESSION,
+ "Bad inflateInit2 error %s(%d) (PULL)",
+ zError(z_ret), z_ret);
+
+ }
+ } else {
+ z_ret = inflateReset2(z, Z_RESET_KEEP_WINDOW);
+ if (z_ret != Z_OK) {
+ return ndr_pull_error(ndrpull, NDR_ERR_COMPRESSION,
+ "Bad inflateReset2 error %s(%d) (PULL)",
+ zError(z_ret), z_ret);
+ }
+ }
+
+ /* call inflate untill we get Z_STREAM_END or an error */
+ while (true) {
+ z_ret = inflate(z, Z_BLOCK);
+ if (z_ret != Z_OK) break;
+ }
+
+ if (z_ret != Z_STREAM_END) {
+ return ndr_pull_error(ndrpull, NDR_ERR_COMPRESSION,
+ "Bad inflate(Z_BLOCK) error %s(%d) (PULL)",
+ zError(z_ret), z_ret);
+ }
+
+ if (z->avail_in) {
+ return ndr_pull_error(ndrpull, NDR_ERR_COMPRESSION,
+ "MSZIP not all avail_in[%u] bytes consumed (PULL)",
+ z->avail_in);
+ }
+
+ if (z->avail_out) {
+ return ndr_pull_error(ndrpull, NDR_ERR_COMPRESSION,
+ "MSZIP not all avail_out[%u] bytes consumed (PULL)",
+ z->avail_out);
}
if ((plain_chunk_size < 0x00008000) || (ndrpull->offset+4 >= ndrpull->data_size)) {
@@ -85,17 +156,16 @@ static enum ndr_err_code ndr_pull_compression_mszip(struct ndr_pull *subndr,
uint32_t payload_size;
uint32_t payload_offset;
uint8_t *payload;
- struct decomp_state *decomp_state;
+ z_stream z;
bool last = false;
ndrpush = ndr_push_init_ctx(subndr, subndr->iconv_convenience);
NDR_ERR_HAVE_NO_MEMORY(ndrpush);
- decomp_state = ZIPdecomp_state(subndr);
- NDR_ERR_HAVE_NO_MEMORY(decomp_state);
+ ZERO_STRUCT(z);
while (!last) {
- NDR_CHECK(ndr_pull_compression_mszip_chunk(subndr, ndrpush, decomp_state, &last));
+ NDR_CHECK(ndr_pull_compression_mszip_chunk(subndr, ndrpush, &z, &last));
}
uncompressed = ndr_push_blob(ndrpush);