Lean and mean initial commit

Not much functionality yet

1 files changed, 14 insertions, 0 deletions

diff --git a/scan_asn1tagint.c b/scan_asn1tagint.c
new file mode 100644
index 0000000..49a9974
--- /dev/null
+++ b/scan_asn1tagint.c
@@ -0,0 +1,14 @@
+#include "asn1.h"
+
+size_t scan_asn1tagint(const char* src,const char* max,unsigned long* val) {
+  const char* orig=src;
+  unsigned long l=0;
+  for (;; ++src) {
+    if (src>=max) return 0;
+    if (l>(((unsigned long)-1)>>7)) return 0;	/* catch integer overflow */
+    l=l*128+(*src&0x7F);
+    if (!(*src&0x80)) break;
+  }
+  *val=l;
+  return src-orig+1;
+}