added stack control to PER

git-svn-id: https://asn1c.svn.sourceforge.net/svnroot/asn1c/trunk@1022 59561ff5-6e30-0410-9f3c-9617f08c8826

1 files changed, 36 insertions, 0 deletions

diff --git a/skeletons/per_decoder.c b/skeletons/per_decoder.c
index 55c04cb5..506ad674 100644
--- a/skeletons/per_decoder.c
+++ b/skeletons/per_decoder.c
@@ -1,2 +1,38 @@
 #include <asn_application.h>
+#include <asn_internal.h>
 #include <per_decoder.h>
+
+asn_dec_rval_t
+uper_decode(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td, void **sptr, const void *buffer, size_t size) {
+	asn_codec_ctx_t s_codec_ctx;
+	asn_per_data_t pd;
+
+	/*
+	 * Stack checker requires that the codec context
+	 * must be allocated on the stack.
+	 */
+	if(opt_codec_ctx) {
+		if(opt_codec_ctx->max_stack_size) {
+			s_codec_ctx = *opt_codec_ctx;
+			opt_codec_ctx = &s_codec_ctx;
+		}
+	} else {
+		/* If context is not given, be security-conscious anyway */
+		memset(&s_codec_ctx, 0, sizeof(s_codec_ctx));
+		s_codec_ctx.max_stack_size = _ASN_DEFAULT_STACK_MAX;
+		opt_codec_ctx = &s_codec_ctx;
+	}
+
+	/* Fill in the position indicator */
+	pd.buffer = (const uint8_t *)buffer;
+	pd.nboff = 0;
+	pd.nbits = 8 * size; 	/* 8 is CHAR_BIT from <limits.h> */
+
+	/*
+	 * Invoke type-specific decoder.
+	 */
+	if(!td->uper_decoder)
+		_ASN_DECODE_FAILED;	/* PER is not compiled in */
+	return td->uper_decoder(opt_codec_ctx, td, 0, sptr, &pd);
+}
+