1 files changed, 55 insertions, 0 deletions
diff --git a/src/per_decoder.c b/src/per_decoder.c
new file mode 100644
index 0000000..16dee36
--- /dev/null
+++ b/src/per_decoder.c
@@ -0,0 +1,55 @@
+#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, int skip_bits, int unused_bits) {
+	asn_codec_ctx_t s_codec_ctx;
+	asn_dec_rval_t rval;
+	asn_per_data_t pd;
+
+	if(skip_bits < 0 || skip_bits > 7
+	|| unused_bits < 0 || unused_bits > 7
+	|| (unused_bits > 0 && !size))
+		_ASN_DECODE_FAILED;
+
+	/*
+	 * 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 = skip_bits;
+	pd.nbits = 8 * size - unused_bits; /* 8 is CHAR_BIT from <limits.h> */
+	if(pd.nboff > pd.nbits)
+		_ASN_DECODE_FAILED;
+
+	/*
+	 * Invoke type-specific decoder.
+	 */
+	if(!td->uper_decoder)
+		_ASN_DECODE_FAILED;	/* PER is not compiled in */
+	rval = td->uper_decoder(opt_codec_ctx, td, 0, sptr, &pd);
+	if(rval.code == RC_OK) {
+		/* Return the number of consumed bits */
+		rval.consumed = ((pd.buffer - (const uint8_t *)buffer) << 3)
+					+ pd.nboff - skip_bits;
+	} else {
+		/* PER codec is not a restartable */
+		rval.consumed = 0;
+	}
+	return rval;
+}
+