Initial commit - http://sourceforge.net/p/fceumm/code/160/

src/fceu-endian.c

@@ -0,0 +1,99 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2002 Xodnizel
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/*  Contains file I/O functions that write/read data    */
+/*  LSB first.              */
+
+#ifdef __LIBRETRO__
+#define ENDIAN_LIBRETRO
+#endif
+
+#include <stdio.h>
+#include "memory.h"
+#include "fceu-types.h"
+#include "fceu-endian.h"
+
+void FlipByteOrder(uint8 *src, uint32 count) {
+	uint8 *start = src;
+	uint8 *end = src + count - 1;
+
+	if ((count & 1) || !count) return;	/* This shouldn't happen. */
+
+	while (count--) {
+		uint8 tmp;
+
+		tmp = *end;
+		*end = *start;
+		*start = tmp;
+		end--;
+		start++;
+	}
+}
+
+int write16le(uint16 b, MEM_TYPE *fp) {
+	uint8 s[2];
+	s[0] = b;
+	s[1] = b >> 8;
+	return((fwrite(s, 1, 2, fp) < 2) ? 0 : 2);
+}
+
+int write32le(uint32 b, MEM_TYPE *fp) {
+	uint8 s[4];
+	s[0] = b;
+	s[1] = b >> 8;
+	s[2] = b >> 16;
+	s[3] = b >> 24;
+	return((fwrite(s, 1, 4, fp) < 4) ? 0 : 4);
+}
+
+int read32le(uint32 *Bufo, MEM_TYPE *fp) {
+	uint32 buf;
+	if (fread(&buf, 1, 4, fp) < 4)
+		return 0;
+ #ifdef LSB_FIRST
+	*(uint32*)Bufo = buf;
+ #else
+	*(uint32*)Bufo = ((buf & 0xFF) << 24) | ((buf & 0xFF00) << 8) | ((buf & 0xFF0000) >> 8) | ((buf & 0xFF000000) >> 24);
+ #endif
+	return 1;
+}
+
+int read16le(char *d, MEM_TYPE *fp) {
+ #ifdef LSB_FIRST
+	return((fread(d, 1, 2, fp) < 2) ? 0 : 2);
+ #else
+	int ret;
+	ret = fread(d + 1, 1, 1, fp);
+	ret += fread(d, 1, 1, fp);
+	return ret < 2 ? 0 : 2;
+ #endif
+}
+
+void FCEU_en32lsb(uint8 *buf, uint32 morp) {
+	buf[0] = morp;
+	buf[1] = morp >> 8;
+	buf[2] = morp >> 16;
+	buf[3] = morp >> 24;
+}
+
+uint32 FCEU_de32lsb(uint8 *morp) {
+	return(morp[0] | (morp[1] << 8) | (morp[2] << 16) | (morp[3] << 24));
+}
+