ndr.c

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			NDR_CHECK(ndr_push_zero(subndr, padding_len));
		} else if (padding_len < 0) {
			return ndr_push_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext (PUSH) content_size %d is larger than size_is(%d)",
					      (int)subndr->offset, (int)size_is);
		}
	}

	switch (header_size) {
	case 0: 
		break;

	case 2: 
		NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, subndr->offset));
		break;

	case 4: 
		NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, subndr->offset));
		break;

	default:
		return ndr_push_error(ndr, NDR_ERR_SUBCONTEXT, "Bad subcontext header size %d", 
				      (int)header_size);
	}

	NDR_CHECK(ndr_push_bytes(ndr, subndr->data, subndr->offset));
	return NT_STATUS_OK;
}

/*
  store a token in the ndr context, for later retrieval
*/
NTSTATUS ndr_token_store(TALLOC_CTX *mem_ctx, 
			 struct ndr_token_list **list, 
			 const void *key, 
			 uint32_t value)
{
	struct ndr_token_list *tok;
	tok = talloc(mem_ctx, struct ndr_token_list);
	if (tok == NULL) {
		return NT_STATUS_NO_MEMORY;
	}
	tok->key = key;
	tok->value = value;
	DLIST_ADD((*list), tok);
	return NT_STATUS_OK;
}

/*
  retrieve a token from a ndr context, using cmp_fn to match the tokens
*/
NTSTATUS ndr_token_retrieve_cmp_fn(struct ndr_token_list **list, const void *key, uint32_t *v,
				   comparison_fn_t _cmp_fn, BOOL _remove_tok)
{
	struct ndr_token_list *tok;
	for (tok=*list;tok;tok=tok->next) {
		if (_cmp_fn && _cmp_fn(tok->key,key)==0) goto found;
		else if (!_cmp_fn && tok->key == key) goto found;
	}
	return ndr_map_error(NDR_ERR_TOKEN);
found:
	*v = tok->value;
	if (_remove_tok) {
		DLIST_REMOVE((*list), tok);
		talloc_free(tok);
	}
	return NT_STATUS_OK;		
}

/*
  retrieve a token from a ndr context
*/
NTSTATUS ndr_token_retrieve(struct ndr_token_list **list, const void *key, uint32_t *v)
{
	return ndr_token_retrieve_cmp_fn(list, key, v, NULL, True);
}

/*
  peek at but don't removed a token from a ndr context
*/
uint32_t ndr_token_peek(struct ndr_token_list **list, const void *key)
{
	NTSTATUS status;
	uint32_t v;
	status = ndr_token_retrieve_cmp_fn(list, key, &v, NULL, False);
	if (NT_STATUS_IS_OK(status)) return v;
	return 0;
}

/*
  pull an array size field and add it to the array_size_list token list
*/
NTSTATUS ndr_pull_array_size(struct ndr_pull *ndr, const void *p)
{
	uint32_t size;
	NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &size));
	return ndr_token_store(ndr, &ndr->array_size_list, p, size);
}

/*
  get the stored array size field
*/
uint32_t ndr_get_array_size(struct ndr_pull *ndr, const void *p)
{
	return ndr_token_peek(&ndr->array_size_list, p);
}

/*
  check the stored array size field
*/
NTSTATUS ndr_check_array_size(struct ndr_pull *ndr, void *p, uint32_t size)
{
	uint32_t stored;
	stored = ndr_token_peek(&ndr->array_size_list, p);
	if (stored != size) {
		return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE, 
				      "Bad array size - got %u expected %u\n",
				      stored, size);
	}
	return NT_STATUS_OK;
}

/*
  pull an array length field and add it to the array_length_list token list
*/
NTSTATUS ndr_pull_array_length(struct ndr_pull *ndr, const void *p)
{
	uint32_t length, offset;
	NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &offset));
	if (offset != 0) {
		return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE, 
				      "non-zero array offset %u\n", offset);
	}
	NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &length));
	return ndr_token_store(ndr, &ndr->array_length_list, p, length);
}

/*
  get the stored array length field
*/
uint32_t ndr_get_array_length(struct ndr_pull *ndr, const void *p)
{
	return ndr_token_peek(&ndr->array_length_list, p);
}

/*
  check the stored array length field
*/
NTSTATUS ndr_check_array_length(struct ndr_pull *ndr, void *p, uint32_t length)
{
	uint32_t stored;
	stored = ndr_token_peek(&ndr->array_length_list, p);
	if (stored != length) {
		return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE, 
				      "Bad array length - got %u expected %u\n",
				      stored, length);
	}
	return NT_STATUS_OK;
}

/*
  store a switch value
 */
NTSTATUS ndr_push_set_switch_value(struct ndr_push *ndr, const void *p, uint32_t val)
{
	return ndr_token_store(ndr, &ndr->switch_list, p, val);
}

NTSTATUS ndr_pull_set_switch_value(struct ndr_pull *ndr, const void *p, uint32_t val)
{
	return ndr_token_store(ndr, &ndr->switch_list, p, val);
}

NTSTATUS ndr_print_set_switch_value(struct ndr_print *ndr, const void *p, uint32_t val)
{
	return ndr_token_store(ndr, &ndr->switch_list, p, val);
}

/*
  retrieve a switch value
 */
uint32_t ndr_push_get_switch_value(struct ndr_push *ndr, const void *p)
{
	return ndr_token_peek(&ndr->switch_list, p);
}

uint32_t ndr_pull_get_switch_value(struct ndr_pull *ndr, const void *p)
{
	return ndr_token_peek(&ndr->switch_list, p);
}

uint32_t ndr_print_get_switch_value(struct ndr_print *ndr, const void *p)
{
	return ndr_token_peek(&ndr->switch_list, p);
}

/*
  pull a struct from a blob using NDR
*/
NTSTATUS ndr_pull_struct_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, void *p,
			      ndr_pull_flags_fn_t fn)
{
	struct ndr_pull *ndr;
	ndr = ndr_pull_init_blob(blob, mem_ctx);
	if (!ndr) {
		return NT_STATUS_NO_MEMORY;
	}
	return fn(ndr, NDR_SCALARS|NDR_BUFFERS, p);
}

/*
  pull a struct from a blob using NDR - failing if all bytes are not consumed
*/
NTSTATUS ndr_pull_struct_blob_all(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, void *p,
				  ndr_pull_flags_fn_t fn)
{
	struct ndr_pull *ndr;
	NTSTATUS status;

	ndr = ndr_pull_init_blob(blob, mem_ctx);
	if (!ndr) {
		return NT_STATUS_NO_MEMORY;
	}
	status = fn(ndr, NDR_SCALARS|NDR_BUFFERS, p);
	if (!NT_STATUS_IS_OK(status)) return status;
	if (ndr->offset != ndr->data_size) {
		return NT_STATUS_BUFFER_TOO_SMALL;
	}
	return status;
}

/*
  pull a union from a blob using NDR, given the union discriminator
*/
NTSTATUS ndr_pull_union_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, void *p,
			     uint32_t level, ndr_pull_flags_fn_t fn)
{
	struct ndr_pull *ndr;
	NTSTATUS status;

	ndr = ndr_pull_init_blob(blob, mem_ctx);
	if (!ndr) {
		return NT_STATUS_NO_MEMORY;
	}
	ndr_pull_set_switch_value(ndr, p, level);
	status = fn(ndr, NDR_SCALARS|NDR_BUFFERS, p);
	if (!NT_STATUS_IS_OK(status)) return status;
	if (ndr->offset != ndr->data_size) {
		return NT_STATUS_BUFFER_TOO_SMALL;
	}
	return status;
}

/*
  push a struct to a blob using NDR
*/
NTSTATUS ndr_push_struct_blob(DATA_BLOB *blob, TALLOC_CTX *mem_ctx, const void *p,
			      ndr_push_flags_fn_t fn)
{
	NTSTATUS status;
	struct ndr_push *ndr;
	ndr = ndr_push_init_ctx(mem_ctx);
	if (!ndr) {
		return NT_STATUS_NO_MEMORY;
	}
	status = fn(ndr, NDR_SCALARS|NDR_BUFFERS, p);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	*blob = ndr_push_blob(ndr);

	return NT_STATUS_OK;
}

/*
  push a union to a blob using NDR
*/
NTSTATUS ndr_push_union_blob(DATA_BLOB *blob, TALLOC_CTX *mem_ctx, void *p,
			     uint32_t level, ndr_push_flags_fn_t fn)
{
	NTSTATUS status;
	struct ndr_push *ndr;
	ndr = ndr_push_init_ctx(mem_ctx);
	if (!ndr) {
		return NT_STATUS_NO_MEMORY;
	}
	ndr_push_set_switch_value(ndr, p, level);
	status = fn(ndr, NDR_SCALARS|NDR_BUFFERS, p);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	*blob = ndr_push_blob(ndr);

	return NT_STATUS_OK;
}

/*
  generic ndr_size_*() handler for structures
*/
size_t ndr_size_struct(const void *p, int flags, ndr_push_flags_fn_t push)
{
	struct ndr_push *ndr;
	NTSTATUS status;
	size_t ret;

	/* avoid recursion */
	if (flags & LIBNDR_FLAG_NO_NDR_SIZE) return 0;

	ndr = ndr_push_init_ctx(NULL);
	if (!ndr) return 0;
	ndr->flags |= flags | LIBNDR_FLAG_NO_NDR_SIZE;
	status = push(ndr, NDR_SCALARS|NDR_BUFFERS, p);
	if (!NT_STATUS_IS_OK(status)) {
		return 0;
	}
	ret = ndr->offset;
	talloc_free(ndr);
	return ret;
}

/*
  generic ndr_size_*() handler for unions
*/
size_t ndr_size_union(const void *p, int flags, uint32_t level, ndr_push_flags_fn_t push)
{
	struct ndr_push *ndr;
	NTSTATUS status;
	size_t ret;

	/* avoid recursion */
	if (flags & LIBNDR_FLAG_NO_NDR_SIZE) return 0;

	ndr = ndr_push_init_ctx(NULL);
	if (!ndr) return 0;
	ndr->flags |= flags | LIBNDR_FLAG_NO_NDR_SIZE;
	ndr_push_set_switch_value(ndr, p, level);
	status = push(ndr, NDR_SCALARS|NDR_BUFFERS, p);
	if (!NT_STATUS_IS_OK(status)) {
		return 0;
	}
	ret = ndr->offset;
	talloc_free(ndr);
	return ret;
}

/*
  get the current base for relative pointers for the push
*/
uint32_t ndr_push_get_relative_base_offset(struct ndr_push *ndr)
{
	return ndr->relative_base_offset;
}

/*
  restore the old base for relative pointers for the push
*/
void ndr_push_restore_relative_base_offset(struct ndr_push *ndr, uint32_t offset)
{
	ndr->relative_base_offset = offset;
}

/*
  setup the current base for relative pointers for the push
  called in the NDR_SCALAR stage
*/
NTSTATUS ndr_push_setup_relative_base_offset1(struct ndr_push *ndr, const void *p, uint32_t offset)
{
	ndr->relative_base_offset = offset;
	return ndr_token_store(ndr, &ndr->relative_base_list, p, offset);
}

/*
  setup the current base for relative pointers for the push
  called in the NDR_BUFFERS stage
*/
NTSTATUS ndr_push_setup_relative_base_offset2(struct ndr_push *ndr, const void *p)
{
	return ndr_token_retrieve(&ndr->relative_base_list, p, &ndr->relative_base_offset);
}

/*
  push a relative object - stage1
  this is called during SCALARS processing
*/
NTSTATUS ndr_push_relative_ptr1(struct ndr_push *ndr, const void *p)
{
	if (p == NULL) {
		NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, 0));
		return NT_STATUS_OK;
	}
	NDR_CHECK(ndr_push_align(ndr, 4));
	NDR_CHECK(ndr_token_store(ndr, &ndr->relative_list, p, ndr->offset));
	return ndr_push_uint32(ndr, NDR_SCALARS, 0xFFFFFFFF);
}

/*
  push a relative object - stage2
  this is called during buffers processing
*/
NTSTATUS ndr_push_relative_ptr2(struct ndr_push *ndr, const void *p)
{
	struct ndr_push_save save;
	uint32_t ptr_offset = 0xFFFFFFFF;
	if (p == NULL) {
		return NT_STATUS_OK;
	}
	ndr_push_save(ndr, &save);
	NDR_CHECK(ndr_token_retrieve(&ndr->relative_list, p, &ptr_offset));
	if (ptr_offset > ndr->offset) {
		return ndr_push_error(ndr, NDR_ERR_BUFSIZE, 
				      "ndr_push_relative_ptr2 ptr_offset(%u) > ndr->offset(%u)",
				      ptr_offset, ndr->offset);
	}
	ndr->offset = ptr_offset;
	if (save.offset < ndr->relative_base_offset) {
		return ndr_push_error(ndr, NDR_ERR_BUFSIZE, 
				      "ndr_push_relative_ptr2 save.offset(%u) < ndr->relative_base_offset(%u)",
				      save.offset, ndr->relative_base_offset);
	}	
	NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, save.offset - ndr->relative_base_offset));
	ndr_push_restore(ndr, &save);
	return NT_STATUS_OK;
}

/*
  get the current base for relative pointers for the pull
*/
uint32_t ndr_pull_get_relative_base_offset(struct ndr_pull *ndr)
{
	return ndr->relative_base_offset;
}

/*
  restore the old base for relative pointers for the pull
*/
void ndr_pull_restore_relative_base_offset(struct ndr_pull *ndr, uint32_t offset)
{
	ndr->relative_base_offset = offset;
}

/*
  setup the current base for relative pointers for the pull
  called in the NDR_SCALAR stage
*/
NTSTATUS ndr_pull_setup_relative_base_offset1(struct ndr_pull *ndr, const void *p, uint32_t offset)
{
	ndr->relative_base_offset = offset;
	return ndr_token_store(ndr, &ndr->relative_base_list, p, offset);
}

/*
  setup the current base for relative pointers for the pull
  called in the NDR_BUFFERS stage
*/
NTSTATUS ndr_pull_setup_relative_base_offset2(struct ndr_pull *ndr, const void *p)
{
	return ndr_token_retrieve(&ndr->relative_base_list, p, &ndr->relative_base_offset);
}

/*
  pull a relative object - stage1
  called during SCALARS processing
*/
NTSTATUS ndr_pull_relative_ptr1(struct ndr_pull *ndr, const void *p, uint32_t rel_offset)
{
	rel_offset += ndr->relative_base_offset;
	if (rel_offset > ndr->data_size) {
		return ndr_pull_error(ndr, NDR_ERR_BUFSIZE, 
				      "ndr_pull_relative_ptr1 rel_offset(%u) > ndr->data_size(%u)",
				      rel_offset, ndr->data_size);
	}
	return ndr_token_store(ndr, &ndr->relative_list, p, rel_offset);
}

/*
  pull a relative object - stage2
  called during BUFFERS processing
*/
NTSTATUS ndr_pull_relative_ptr2(struct ndr_pull *ndr, const void *p)
{
	uint32_t rel_offset;
	NDR_CHECK(ndr_token_retrieve(&ndr->relative_list, p, &rel_offset));
	return ndr_pull_set_offset(ndr, rel_offset);
}