Adds ips/bps softpatching

Patches named like the content will be auto-applied in memory when the
game is loaded.

Example: /roms/game.gba will apply patches named /roms/game.ips,
/roms/game.ips1, /roms/game.IPS2, /roms/game.bps, etc. This only
happens in memory, original files are unmodified.

Patches are loaded in case-insensitive alphabetical order. Note that
.ips12 loads before .ips2, but after .ips02.

Only supports cores that load from memory (see libretro page at
https://docs.libretro.com/guides/softpatching/ for compatibility list)

1 files changed, 7 insertions, 0 deletions

diff --git a/patch.h b/patch.h
new file mode 100644
index 0000000..47d2aad
--- /dev/null
+++ b/patch.h
@@ -0,0 +1,7 @@
+#ifndef PATCH_H
+#define PATCH_H
+
+int patch(const void *in, size_t in_size,
+          const uint8_t *patch, size_t patch_size,
+          void **out, size_t *out_size);
+#endif