2 Unix SMB/CIFS implementation.
3 Samba memory buffer functions
4 Copyright (C) Andrew Tridgell 1992-1997
5 Copyright (C) Luke Kenneth Casson Leighton 1996-1997
6 Copyright (C) Jeremy Allison 1999
7 Copyright (C) Andrew Bartlett 2003.
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include "../librpc/gen_ndr/ndr_schannel.h"
27 #define DBGC_CLASS DBGC_RPC_PARSE
30 * Dump a prs to a file: from the current location through to the end.
32 void prs_dump(const char *name, int v, prs_struct *ps)
34 prs_dump_region(name, v, ps, ps->data_offset, ps->buffer_size);
38 * Dump from the start of the prs to the current location.
40 void prs_dump_before(const char *name, int v, prs_struct *ps)
42 prs_dump_region(name, v, ps, 0, ps->data_offset);
46 * Dump everything from the start of the prs up to the current location.
48 void prs_dump_region(const char *name, int v, prs_struct *ps,
49 int from_off, int to_off)
54 if (DEBUGLEVEL < 50) return;
57 if (asprintf(&fname,"/tmp/%s_%d.%d.prs", name, v, i) < 0) {
61 if (asprintf(&fname,"/tmp/%s.%d.prs", name, i) < 0) {
65 fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
66 if (fd != -1 || errno != EEXIST) break;
69 sz = write(fd, ps->data_p + from_off, to_off - from_off);
71 if ( (sz != to_off-from_off) || (i != 0) ) {
72 DEBUG(0,("Error writing/closing %s: %ld!=%ld %d\n", fname, (unsigned long)sz, (unsigned long)to_off-from_off, i ));
74 DEBUG(0,("created %s\n", fname));
80 /*******************************************************************
81 Debug output for parsing info
83 XXXX side-effect of this function is to increase the debug depth XXXX.
85 ********************************************************************/
87 void prs_debug(prs_struct *ps, int depth, const char *desc, const char *fn_name)
89 DEBUG(5+depth, ("%s%06x %s %s\n", tab_depth(5+depth,depth), ps->data_offset, fn_name, desc));
93 * Initialise an expandable parse structure.
95 * @param size Initial buffer size. If >0, a new buffer will be
96 * created with malloc().
98 * @return False if allocation fails, otherwise True.
101 bool prs_init(prs_struct *ps, uint32 size, TALLOC_CTX *ctx, bool io)
105 ps->bigendian_data = RPC_LITTLE_ENDIAN;
106 ps->align = RPC_PARSE_ALIGN;
107 ps->is_dynamic = False;
114 ps->buffer_size = size;
115 if((ps->data_p = (char *)SMB_MALLOC((size_t)size)) == NULL) {
116 DEBUG(0,("prs_init: malloc fail for %u bytes.\n", (unsigned int)size));
119 memset(ps->data_p, '\0', (size_t)size);
120 ps->is_dynamic = True; /* We own this memory. */
121 } else if (MARSHALLING(ps)) {
122 /* If size is zero and we're marshalling we should allocate memory on demand. */
123 ps->is_dynamic = True;
129 /*******************************************************************
130 Delete the memory in a parse structure - if we own it.
132 NOTE: Contrary to the somewhat confusing naming, this function is not
133 intended for freeing memory allocated by prs_alloc_mem(). That memory
134 is attached to the talloc context given by ps->mem_ctx.
135 ********************************************************************/
137 void prs_mem_free(prs_struct *ps)
140 SAFE_FREE(ps->data_p);
141 ps->is_dynamic = False;
146 /*******************************************************************
147 Clear the memory in a parse structure.
148 ********************************************************************/
150 void prs_mem_clear(prs_struct *ps)
153 memset(ps->data_p, '\0', (size_t)ps->buffer_size);
156 /*******************************************************************
157 Allocate memory when unmarshalling... Always zero clears.
158 ********************************************************************/
160 #if defined(PARANOID_MALLOC_CHECKER)
161 char *prs_alloc_mem_(prs_struct *ps, size_t size, unsigned int count)
163 char *prs_alloc_mem(prs_struct *ps, size_t size, unsigned int count)
169 /* We can't call the type-safe version here. */
170 ret = (char *)_talloc_zero_array(ps->mem_ctx, size, count,
176 /*******************************************************************
177 Return the current talloc context we're using.
178 ********************************************************************/
180 TALLOC_CTX *prs_get_mem_context(prs_struct *ps)
185 /*******************************************************************
186 Hand some already allocated memory to a prs_struct.
187 ********************************************************************/
189 void prs_give_memory(prs_struct *ps, char *buf, uint32 size, bool is_dynamic)
191 ps->is_dynamic = is_dynamic;
193 ps->buffer_size = size;
196 /*******************************************************************
197 Take some memory back from a prs_struct.
198 ********************************************************************/
200 char *prs_take_memory(prs_struct *ps, uint32 *psize)
202 char *ret = ps->data_p;
204 *psize = ps->buffer_size;
205 ps->is_dynamic = False;
210 /*******************************************************************
211 Set a prs_struct to exactly a given size. Will grow or tuncate if neccessary.
212 ********************************************************************/
214 bool prs_set_buffer_size(prs_struct *ps, uint32 newsize)
216 if (newsize > ps->buffer_size)
217 return prs_force_grow(ps, newsize - ps->buffer_size);
219 if (newsize < ps->buffer_size) {
220 ps->buffer_size = newsize;
222 /* newsize == 0 acts as a free and set pointer to NULL */
224 SAFE_FREE(ps->data_p);
226 ps->data_p = (char *)SMB_REALLOC(ps->data_p, newsize);
228 if (ps->data_p == NULL) {
229 DEBUG(0,("prs_set_buffer_size: Realloc failure for size %u.\n",
230 (unsigned int)newsize));
231 DEBUG(0,("prs_set_buffer_size: Reason %s\n",strerror(errno)));
240 /*******************************************************************
241 Attempt, if needed, to grow a data buffer.
242 Also depends on the data stream mode (io).
243 ********************************************************************/
245 bool prs_grow(prs_struct *ps, uint32 extra_space)
249 ps->grow_size = MAX(ps->grow_size, ps->data_offset + extra_space);
251 if(ps->data_offset + extra_space <= ps->buffer_size)
255 * We cannot grow the buffer if we're not reading
256 * into the prs_struct, or if we don't own the memory.
259 if(UNMARSHALLING(ps) || !ps->is_dynamic) {
260 DEBUG(0,("prs_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
261 (unsigned int)extra_space));
266 * Decide how much extra space we really need.
269 extra_space -= (ps->buffer_size - ps->data_offset);
270 if(ps->buffer_size == 0) {
273 * Start with 128 bytes (arbitrary value), enough for small rpc
276 new_size = MAX(128, extra_space);
278 if((ps->data_p = (char *)SMB_MALLOC(new_size)) == NULL) {
279 DEBUG(0,("prs_grow: Malloc failure for size %u.\n", (unsigned int)new_size));
282 memset(ps->data_p, '\0', (size_t)new_size );
285 * If the current buffer size is bigger than the space needed,
286 * just double it, else add extra_space. Always keep 64 bytes
287 * more, so that after we added a large blob we don't have to
288 * realloc immediately again.
290 new_size = MAX(ps->buffer_size*2,
291 ps->buffer_size + extra_space + 64);
293 if ((ps->data_p = (char *)SMB_REALLOC(ps->data_p, new_size)) == NULL) {
294 DEBUG(0,("prs_grow: Realloc failure for size %u.\n",
295 (unsigned int)new_size));
299 memset(&ps->data_p[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
301 ps->buffer_size = new_size;
306 /*******************************************************************
307 Attempt to force a data buffer to grow by len bytes.
308 This is only used when appending more data onto a prs_struct
309 when reading an rpc reply, before unmarshalling it.
310 ********************************************************************/
312 bool prs_force_grow(prs_struct *ps, uint32 extra_space)
314 uint32 new_size = ps->buffer_size + extra_space;
316 if(!UNMARSHALLING(ps) || !ps->is_dynamic) {
317 DEBUG(0,("prs_force_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
318 (unsigned int)extra_space));
322 if((ps->data_p = (char *)SMB_REALLOC(ps->data_p, new_size)) == NULL) {
323 DEBUG(0,("prs_force_grow: Realloc failure for size %u.\n",
324 (unsigned int)new_size));
328 memset(&ps->data_p[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
330 ps->buffer_size = new_size;
335 /*******************************************************************
336 Get the data pointer (external interface).
337 ********************************************************************/
339 char *prs_data_p(prs_struct *ps)
344 /*******************************************************************
345 Get the current data size (external interface).
346 ********************************************************************/
348 uint32 prs_data_size(prs_struct *ps)
350 return ps->buffer_size;
353 /*******************************************************************
354 Fetch the current offset (external interface).
355 ********************************************************************/
357 uint32 prs_offset(prs_struct *ps)
359 return ps->data_offset;
362 /*******************************************************************
363 Set the current offset (external interface).
364 ********************************************************************/
366 bool prs_set_offset(prs_struct *ps, uint32 offset)
368 if ((offset > ps->data_offset)
369 && !prs_grow(ps, offset - ps->data_offset)) {
373 ps->data_offset = offset;
377 /*******************************************************************
378 Append the data from one parse_struct into another.
379 ********************************************************************/
381 bool prs_append_prs_data(prs_struct *dst, prs_struct *src)
383 if (prs_offset(src) == 0)
386 if(!prs_grow(dst, prs_offset(src)))
389 memcpy(&dst->data_p[dst->data_offset], src->data_p, (size_t)prs_offset(src));
390 dst->data_offset += prs_offset(src);
395 /*******************************************************************
396 Append some data from one parse_struct into another.
397 ********************************************************************/
399 bool prs_append_some_data(prs_struct *dst, void *src_base, uint32_t start,
406 if(!prs_grow(dst, len)) {
410 memcpy(&dst->data_p[dst->data_offset], ((char *)src_base) + start, (size_t)len);
411 dst->data_offset += len;
415 bool prs_append_some_prs_data(prs_struct *dst, prs_struct *src, int32 start,
418 return prs_append_some_data(dst, src->data_p, start, len);
421 /*******************************************************************
422 Append the data from a buffer into a parse_struct.
423 ********************************************************************/
425 bool prs_copy_data_in(prs_struct *dst, const char *src, uint32 len)
430 if(!prs_grow(dst, len))
433 memcpy(&dst->data_p[dst->data_offset], src, (size_t)len);
434 dst->data_offset += len;
439 /*******************************************************************
440 Copy some data from a parse_struct into a buffer.
441 ********************************************************************/
443 bool prs_copy_data_out(char *dst, prs_struct *src, uint32 len)
448 if(!prs_mem_get(src, len))
451 memcpy(dst, &src->data_p[src->data_offset], (size_t)len);
452 src->data_offset += len;
457 /*******************************************************************
458 Copy all the data from a parse_struct into a buffer.
459 ********************************************************************/
461 bool prs_copy_all_data_out(char *dst, prs_struct *src)
463 uint32 len = prs_offset(src);
468 prs_set_offset(src, 0);
469 return prs_copy_data_out(dst, src, len);
472 /*******************************************************************
473 Set the data as X-endian (external interface).
474 ********************************************************************/
476 void prs_set_endian_data(prs_struct *ps, bool endian)
478 ps->bigendian_data = endian;
481 /*******************************************************************
482 Align a the data_len to a multiple of align bytes - filling with
484 ********************************************************************/
486 bool prs_align(prs_struct *ps)
488 uint32 mod = ps->data_offset & (ps->align-1);
490 if (ps->align != 0 && mod != 0) {
491 uint32 extra_space = (ps->align - mod);
492 if(!prs_grow(ps, extra_space))
494 memset(&ps->data_p[ps->data_offset], '\0', (size_t)extra_space);
495 ps->data_offset += extra_space;
501 /******************************************************************
502 Align on a 2 byte boundary
503 *****************************************************************/
505 bool prs_align_uint16(prs_struct *ps)
508 uint8 old_align = ps->align;
512 ps->align = old_align;
517 /******************************************************************
518 Align on a 8 byte boundary
519 *****************************************************************/
521 bool prs_align_uint64(prs_struct *ps)
524 uint8 old_align = ps->align;
528 ps->align = old_align;
533 /******************************************************************
534 Align on a specific byte boundary
535 *****************************************************************/
537 bool prs_align_custom(prs_struct *ps, uint8 boundary)
540 uint8 old_align = ps->align;
542 ps->align = boundary;
544 ps->align = old_align;
551 /*******************************************************************
552 Align only if required (for the unistr2 string mainly)
553 ********************************************************************/
555 bool prs_align_needed(prs_struct *ps, uint32 needed)
560 return prs_align(ps);
563 /*******************************************************************
564 Ensure we can read/write to a given offset.
565 ********************************************************************/
567 char *prs_mem_get(prs_struct *ps, uint32 extra_size)
569 if(UNMARSHALLING(ps)) {
571 * If reading, ensure that we can read the requested size item.
573 if (ps->data_offset + extra_size > ps->buffer_size) {
574 DEBUG(0,("prs_mem_get: reading data of size %u would overrun "
575 "buffer by %u bytes.\n",
576 (unsigned int)extra_size,
577 (unsigned int)(ps->data_offset + extra_size - ps->buffer_size) ));
582 * Writing - grow the buffer if needed.
584 if(!prs_grow(ps, extra_size))
587 return &ps->data_p[ps->data_offset];
590 /*******************************************************************
591 Change the struct type.
592 ********************************************************************/
594 void prs_switch_type(prs_struct *ps, bool io)
596 if ((ps->io ^ io) == True)
600 /*******************************************************************
601 Force a prs_struct to be dynamic even when it's size is 0.
602 ********************************************************************/
604 void prs_force_dynamic(prs_struct *ps)
609 /*******************************************************************
610 Associate a session key with a parse struct.
611 ********************************************************************/
613 void prs_set_session_key(prs_struct *ps, const char sess_key[16])
615 ps->sess_key = sess_key;
618 /*******************************************************************
620 ********************************************************************/
622 bool prs_uint8(const char *name, prs_struct *ps, int depth, uint8 *data8)
624 char *q = prs_mem_get(ps, 1);
628 if (UNMARSHALLING(ps))
633 DEBUGADD(5,("%s%04x %s: %02x\n", tab_depth(5,depth), ps->data_offset, name, *data8));
635 ps->data_offset += 1;
640 /*******************************************************************
642 ********************************************************************/
644 bool prs_uint16(const char *name, prs_struct *ps, int depth, uint16 *data16)
646 char *q = prs_mem_get(ps, sizeof(uint16));
650 if (UNMARSHALLING(ps)) {
651 if (ps->bigendian_data)
652 *data16 = RSVAL(q,0);
656 if (ps->bigendian_data)
662 DEBUGADD(5,("%s%04x %s: %04x\n", tab_depth(5,depth), ps->data_offset, name, *data16));
664 ps->data_offset += sizeof(uint16);
669 /*******************************************************************
671 ********************************************************************/
673 bool prs_uint32(const char *name, prs_struct *ps, int depth, uint32 *data32)
675 char *q = prs_mem_get(ps, sizeof(uint32));
679 if (UNMARSHALLING(ps)) {
680 if (ps->bigendian_data)
681 *data32 = RIVAL(q,0);
685 if (ps->bigendian_data)
691 DEBUGADD(5,("%s%04x %s: %08x\n", tab_depth(5,depth), ps->data_offset, name, *data32));
693 ps->data_offset += sizeof(uint32);
698 /*******************************************************************
700 ********************************************************************/
702 bool prs_int32(const char *name, prs_struct *ps, int depth, int32 *data32)
704 char *q = prs_mem_get(ps, sizeof(int32));
708 if (UNMARSHALLING(ps)) {
709 if (ps->bigendian_data)
710 *data32 = RIVALS(q,0);
712 *data32 = IVALS(q,0);
714 if (ps->bigendian_data)
715 RSIVALS(q,0,*data32);
720 DEBUGADD(5,("%s%04x %s: %08x\n", tab_depth(5,depth), ps->data_offset, name, *data32));
722 ps->data_offset += sizeof(int32);
727 /*******************************************************************
728 Stream a uint64_struct
729 ********************************************************************/
730 bool prs_uint64(const char *name, prs_struct *ps, int depth, uint64 *data64)
732 if (UNMARSHALLING(ps)) {
735 if (!prs_uint32(name, ps, depth+1, &low))
738 if (!prs_uint32(name, ps, depth+1, &high))
741 *data64 = ((uint64_t)high << 32) + low;
745 uint32 high = (*data64) >> 32, low = (*data64) & 0xFFFFFFFF;
746 return prs_uint32(name, ps, depth+1, &low) &&
747 prs_uint32(name, ps, depth+1, &high);
751 /*******************************************************************
752 Stream a DCE error code
753 ********************************************************************/
755 bool prs_dcerpc_status(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
757 char *q = prs_mem_get(ps, sizeof(uint32));
761 if (UNMARSHALLING(ps)) {
762 if (ps->bigendian_data)
763 *status = NT_STATUS(RIVAL(q,0));
765 *status = NT_STATUS(IVAL(q,0));
767 if (ps->bigendian_data)
768 RSIVAL(q,0,NT_STATUS_V(*status));
770 SIVAL(q,0,NT_STATUS_V(*status));
773 DEBUGADD(5,("%s%04x %s: %s\n", tab_depth(5,depth), ps->data_offset, name,
774 dcerpc_errstr(debug_ctx(), NT_STATUS_V(*status))));
776 ps->data_offset += sizeof(uint32);
781 /******************************************************************
782 Stream an array of uint8s. Length is number of uint8s.
783 ********************************************************************/
785 bool prs_uint8s(bool charmode, const char *name, prs_struct *ps, int depth, uint8 *data8s, int len)
788 char *q = prs_mem_get(ps, len);
792 if (UNMARSHALLING(ps)) {
793 for (i = 0; i < len; i++)
794 data8s[i] = CVAL(q,i);
796 for (i = 0; i < len; i++)
797 SCVAL(q, i, data8s[i]);
800 DEBUGADD(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset ,name));
802 print_asc(5, (unsigned char*)data8s, len);
804 for (i = 0; i < len; i++)
805 DEBUGADD(5,("%02x ", data8s[i]));
809 ps->data_offset += len;
814 /******************************************************************
815 Stream an array of uint16s. Length is number of uint16s.
816 ********************************************************************/
818 bool prs_uint16s(bool charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
821 char *q = prs_mem_get(ps, len * sizeof(uint16));
825 if (UNMARSHALLING(ps)) {
826 if (ps->bigendian_data) {
827 for (i = 0; i < len; i++)
828 data16s[i] = RSVAL(q, 2*i);
830 for (i = 0; i < len; i++)
831 data16s[i] = SVAL(q, 2*i);
834 if (ps->bigendian_data) {
835 for (i = 0; i < len; i++)
836 RSSVAL(q, 2*i, data16s[i]);
838 for (i = 0; i < len; i++)
839 SSVAL(q, 2*i, data16s[i]);
843 DEBUGADD(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
845 print_asc(5, (unsigned char*)data16s, 2*len);
847 for (i = 0; i < len; i++)
848 DEBUGADD(5,("%04x ", data16s[i]));
852 ps->data_offset += (len * sizeof(uint16));
857 /******************************************************************
858 Stream an array of uint32s. Length is number of uint32s.
859 ********************************************************************/
861 bool prs_uint32s(bool charmode, const char *name, prs_struct *ps, int depth, uint32 *data32s, int len)
864 char *q = prs_mem_get(ps, len * sizeof(uint32));
868 if (UNMARSHALLING(ps)) {
869 if (ps->bigendian_data) {
870 for (i = 0; i < len; i++)
871 data32s[i] = RIVAL(q, 4*i);
873 for (i = 0; i < len; i++)
874 data32s[i] = IVAL(q, 4*i);
877 if (ps->bigendian_data) {
878 for (i = 0; i < len; i++)
879 RSIVAL(q, 4*i, data32s[i]);
881 for (i = 0; i < len; i++)
882 SIVAL(q, 4*i, data32s[i]);
886 DEBUGADD(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
888 print_asc(5, (unsigned char*)data32s, 4*len);
890 for (i = 0; i < len; i++)
891 DEBUGADD(5,("%08x ", data32s[i]));
895 ps->data_offset += (len * sizeof(uint32));
900 /*******************************************************************
901 Stream a unicode null-terminated string. As the string is already
902 in little-endian format then do it as a stream of bytes.
903 ********************************************************************/
905 bool prs_unistr(const char *name, prs_struct *ps, int depth, UNISTR *str)
907 unsigned int len = 0;
908 unsigned char *p = (unsigned char *)str->buffer;
914 if (MARSHALLING(ps)) {
916 for(len = 0; str->buffer[len] != 0; len++)
919 q = prs_mem_get(ps, (len+1)*2);
925 for(len = 0; str->buffer[len] != 0; len++) {
926 if(ps->bigendian_data) {
927 /* swap bytes - p is little endian, q is big endian. */
943 * even if the string is 'empty' (only an \0 char)
944 * at this point the leading \0 hasn't been parsed.
954 DEBUGADD(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
955 print_asc(5, (unsigned char*)start, 2*len);
958 else { /* unmarshalling */
960 uint32 alloc_len = 0;
961 q = ps->data_p + prs_offset(ps);
964 * Work out how much space we need and talloc it.
966 max_len = (ps->buffer_size - ps->data_offset)/sizeof(uint16);
968 /* the test of the value of *ptr helps to catch the circumstance
969 where we have an emtpty (non-existent) string in the buffer */
970 for ( ptr = (uint16 *)q; *ptr++ && (alloc_len <= max_len); alloc_len++)
974 if (alloc_len < max_len)
977 /* should we allocate anything at all? */
978 str->buffer = PRS_ALLOC_MEM(ps,uint16,alloc_len);
979 if ((str->buffer == NULL) && (alloc_len > 0))
982 p = (unsigned char *)str->buffer;
985 /* the (len < alloc_len) test is to prevent us from overwriting
986 memory that is not ours...if we get that far, we have a non-null
987 terminated string in the buffer and have messed up somewhere */
988 while ((len < alloc_len) && (*(uint16 *)q != 0)) {
989 if(ps->bigendian_data)
991 /* swap bytes - q is big endian, p is little endian. */
992 p[0] = (unsigned char)q[1];
993 p[1] = (unsigned char)q[0];
998 p[0] = (unsigned char)q[0];
999 p[1] = (unsigned char)q[1];
1006 if (len < alloc_len) {
1007 /* NULL terminate the UNISTR */
1008 str->buffer[len++] = '\0';
1011 DEBUGADD(5,("%s%04x %s: ", tab_depth(5,depth), ps->data_offset, name));
1012 print_asc(5, (unsigned char*)str->buffer, 2*len);
1013 DEBUGADD(5, ("\n"));
1016 /* set the offset in the prs_struct; 'len' points to the
1017 terminiating NULL in the UNISTR so we need to go one more
1019 ps->data_offset += (len)*2;
1024 /*******************************************************************
1025 creates a new prs_struct containing a DATA_BLOB
1026 ********************************************************************/
1027 bool prs_init_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
1029 if (!prs_init( prs, RPC_MAX_PDU_FRAG_LEN, mem_ctx, MARSHALL ))
1033 if (!prs_copy_data_in(prs, (char *)blob->data, blob->length))
1039 /*******************************************************************
1040 return the contents of a prs_struct in a DATA_BLOB
1041 ********************************************************************/
1042 bool prs_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx)
1044 blob->length = prs_data_size(prs);
1045 blob->data = (uint8 *)TALLOC_ZERO_SIZE(mem_ctx, blob->length);
1047 /* set the pointer at the end of the buffer */
1048 prs_set_offset( prs, prs_data_size(prs) );
1050 if (!prs_copy_all_data_out((char *)blob->data, prs))