Add codecs to librbcodec.

Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>

1 files changed, 83 insertions, 0 deletions

diff --git a/lib/rbcodec/codecs/libgme/rom_data.h b/lib/rbcodec/codecs/libgme/rom_data.h
new file mode 100644
index 0000000000..b8bc54cd3f
--- /dev/null
+++ b/lib/rbcodec/codecs/libgme/rom_data.h
@@ -0,0 +1,83 @@
+// Common aspects of emulators which use rom data
+
+// Game_Music_Emu 0.5.2
+#ifndef ROM_DATA_H
+#define ROM_DATA_H
+
+#include "blargg_common.h"
+#include "blargg_source.h"
+
+// ROM data handler, used by several Classic_Emu derivitives. Loads file data
+// with padding on both sides, allowing direct use in bank mapping. The main purpose
+// is to allow all file data to be loaded with only one read() call (for efficiency).
+
+extern const char gme_wrong_file_type []; // declared in gme.h
+
+enum { pad_extra = 8 };
+enum { max_bank_size = 0x4000 };
+enum { max_pad_size = max_bank_size + pad_extra };
+enum { max_rom_size = 2 * max_pad_size };
+
+struct  Rom_Data {
+        byte* file_data;
+        unsigned file_size;
+        
+        int rom_addr;
+        int bank_size;
+        int rom_size;
+        unsigned pad_size;
+        int mask;
+        int size; // TODO: eliminate
+        int rsize_;
+        
+        // Unmapped space
+        byte unmapped [max_rom_size];
+};
+
+// Initialize rom
+static inline void Rom_init( struct Rom_Data* this, int bank_size )
+{
+        this->bank_size = bank_size;
+        this->pad_size = this->bank_size + pad_extra;
+        this->rom_size = 2 * this->pad_size;
+}
+
+// Load file data, using already-loaded header 'h' if not NULL. Copy header
+// from loaded file data into *out and fill unmapped bytes with 'fill'.
+blargg_err_t Rom_load( struct Rom_Data* this, const void* data, long size, int header_size, void* header_out, int fill );
+
+// Set address that file data should start at
+void Rom_set_addr( struct Rom_Data* this, int addr );
+
+// Mask address to nearest power of two greater than size()
+static inline int mask_addr( int addr, int mask )
+{
+        #ifdef check
+                check( addr <= mask );
+        #endif
+        return addr & mask;
+}
+
+// Pointer to page starting at addr. Returns unmapped() if outside data.
+static inline byte* Rom_at_addr( struct Rom_Data* this, int addr )
+{
+        unsigned offset = mask_addr( addr, this->mask ) - this->rom_addr;
+        if ( offset > (unsigned) (this->rsize_ - this->pad_size) )
+                offset = 0; // unmapped
+                        
+        if ( offset < this->pad_size ) return &this->unmapped [offset];
+        else return &this->file_data [offset - this->pad_size];
+}
+
+
+#ifndef GME_APU_HOOK
+        #define GME_APU_HOOK( emu, addr, data ) ((void) 0)
+#endif
+
+#ifndef GME_FRAME_HOOK
+        #define GME_FRAME_HOOK( emu ) ((void) 0)
+#else
+        #define GME_FRAME_HOOK_DEFINED 1
+#endif
+
+#endif