From e8a8e69a5b442c2cd9205140ce4e3f6b516a999f Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Wed, 24 Mar 2010 09:56:34 -0400
Subject: [PATCH] Don't keep processing bytecode if the data is clearly not a
 shader at all.

---
 mojoshader.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/mojoshader.c b/mojoshader.c
index fdc485b1..f7408ce0 100644
--- a/mojoshader.c
+++ b/mojoshader.c
@@ -6709,6 +6709,7 @@ static int parse_version_token(Context *ctx, const char *profilestr)
     else  // geometry shader? Bogus data?
     {
         fail(ctx, "Unsupported shader type or not a shader at all");
+        return -1;
     } // else
 
     ctx->major_ver = major;
@@ -7676,6 +7677,15 @@ const MOJOSHADER_parseData *MOJOSHADER_parse(const char *profile,
     ctx->parse_phase = MOJOSHADER_PARSEPHASE_WORKING;
     rc = parse_version_token(ctx, profile);
 
+    // drop out now if this definitely isn't bytecode. Saves lots of
+    //  meaningless errors flooding through.
+    if (rc < 0)
+    {
+        retval = build_parsedata(ctx);
+        destroy_context(ctx);
+        return retval;
+    } // if
+
     if ( ((uint32) rc) > ctx->tokencount )
     {
         fail(ctx, "Corrupted or truncated shader");