New stuff and small changes for upcoming ZMV code.

zsnes/src/numconv.h

@@ -0,0 +1,126 @@
+/*
+Copyright (C) 1997-2005 ZSNES Team ( zsKnight, _Demo_, pagefault, Nach )
+
+http://www.zsnes.com
+http://sourceforge.net/projects/zsnes
+
+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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#ifndef NUMCONV_H
+#define NUMCONV_H
+
+#include <stdio.h>
+
+//Get correct mask for particular bit
+#define BIT(X) (1 << X)
+
+/*
+Functions that the compiler should inline that will convert
+uint32, uint24, uint16 to 4 byte, 3 byte, 2 byte arrays
+and back. -Nach
+*/
+
+static unsigned char *uint32_to_bytes(unsigned int num)
+{
+  static unsigned char buffer[4];
+  buffer[3] = (num >> 24) & 0xFF;
+  buffer[2] = (num >> 16) & 0xFF;
+  buffer[1] = (num >> 8) & 0xFF;
+  buffer[0] = num & 0xFF;
+  return(buffer);
+}
+
+static unsigned int bytes_to_uint32(const unsigned char buffer[4])
+{
+  unsigned int num = (unsigned int)buffer[0];
+  num |= ((unsigned int)buffer[1]) << 8;
+  num |= ((unsigned int)buffer[2]) << 16;
+  num |= ((unsigned int)buffer[3]) << 24;
+  return(num);
+}
+
+static unsigned char *uint24_to_bytes(unsigned int num)
+{
+  static unsigned char buffer[3];
+  buffer[2] = (num >> 16) & 0xFF;
+  buffer[1] = (num >> 8) & 0xFF;
+  buffer[0] = num & 0xFF;
+  return(buffer);
+}
+
+static unsigned int bytes_to_uint24(const unsigned char buffer[3])
+{
+  unsigned int num = (unsigned int)buffer[0];
+  num |= ((unsigned int)buffer[1]) << 8;
+  num |= ((unsigned int)buffer[2]) << 16;
+  return(num);
+}
+
+static unsigned char *uint16_to_bytes(unsigned short num)
+{
+  static unsigned char buffer[2];
+  buffer[1] = (num >> 8) & 0xFF;
+  buffer[0] = num & 0xFF;
+  return(buffer);
+}
+
+static unsigned short bytes_to_uint16(const unsigned char buffer[2])
+{
+  unsigned short num = (unsigned short)buffer[0];
+  num |= ((unsigned short)buffer[1]) << 8;
+  return(num);
+}
+
+//Functions to read 2, 3, 4 bytes and convert to uint16, uint24, uint32
+static unsigned short fread2(FILE *fp)
+{
+  unsigned char uint16buf[2];
+  fread(uint16buf, 2, 1, fp);
+  return(bytes_to_uint16(uint16buf));
+}
+
+static unsigned int fread3(FILE *fp)
+{
+  unsigned char uint24buf[3];
+  fread(uint24buf, 3, 1, fp);
+  return(bytes_to_uint24(uint24buf));
+}
+
+static unsigned int fread4(FILE *fp)
+{
+  unsigned char uint32buf[4];
+  fread(uint32buf, 4, 1, fp);
+  return(bytes_to_uint32(uint32buf));
+}
+
+//Functions to write uint16, uint24, uint32 as 2, 3, 4 bytes
+static void fwrite2(unsigned short var, FILE *fp)
+{
+  fwrite(uint16_to_bytes(var), 2, 1, fp);
+}
+
+static void fwrite3(unsigned int var, FILE *fp)
+{
+  fwrite(uint24_to_bytes(var), 3, 1, fp);
+}
+
+static void fwrite4(unsigned int var, FILE *fp)
+{
+  fwrite(uint32_to_bytes(var), 4, 1, fp);
+}
+
+#endif