From 2a9f6d9d408ad56f229fdc155ddb5f011541c14a Mon Sep 17 00:00:00 2001
From: meleu <meleu@users.noreply.github.com>
Date: Mon, 24 Dec 2018 16:00:16 -0200
Subject: [PATCH] SNES hashing, just ignore header if it has one

---
 cheevos/cheevos.c | 20 +++++++-------------
 1 file changed, 7 insertions(+), 13 deletions(-)

diff --git a/cheevos/cheevos.c b/cheevos/cheevos.c
index 59be4db214..aa5a4b3d1d 100644
--- a/cheevos/cheevos.c
+++ b/cheevos/cheevos.c
@@ -2612,7 +2612,7 @@ static int cheevos_iterate(coro_t *coro)
 
    static cheevos_finder_t finders[] =
    {
-      {SNES_MD5,    "SNES (8Mb padding)",                snes_exts},
+      {SNES_MD5,    "SNES (discards header)",            snes_exts},
       {GENESIS_MD5, "Genesis (6Mb padding)",             genesis_exts},
       {LYNX_MD5,    "Atari Lynx (only first 512 bytes)", lynx_exts},
       {NES_MD5,     "NES (discards header)",             NULL},
@@ -2902,7 +2902,12 @@ found:
 
       MD5_Init(&coro->md5);
 
-      coro->offset = 0;
+      /* if the file contains header, ignore it */
+      if (coro->len - ((coro->len / 0x2000) * 0x2000) == 512)
+          coro->offset = 512;
+      else
+        coro->offset = 0;
+
       coro->count  = 0;
 
       CORO_GOSUB(EVAL_MD5);
@@ -2914,17 +2919,6 @@ found:
          CORO_RET();
       }
 
-      if (coro->count < size_in_megabytes(8))
-      {
-         /*
-            * Inputs:  CHEEVOS_VAR_MD5, CHEEVOS_VAR_OFFSET, CHEEVOS_VAR_COUNT
-            * Outputs: CHEEVOS_VAR_MD5
-            */
-         coro->offset      = 0;
-         coro->count       = size_in_megabytes(8) - coro->count;
-         CORO_GOSUB(FILL_MD5);
-      }
-
       MD5_Final(coro->hash, &coro->md5);
       CORO_GOTO(GET_GAMEID);