125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/*
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Copyright (C) 1997-2006 ZSNES Team ( zsKnight, _Demo_, pagefault, Nach )
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http://www.zsnes.com
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http://sourceforge.net/projects/zsnes
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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version 2 as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef NUMCONV_H
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#define NUMCONV_H
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#include <stdio.h>
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//Get correct mask for particular bit
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#define BIT(X) (1 << (X))
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/*
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Functions that the compiler should inline that will convert
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uint32, uint24, uint16 to 4 byte, 3 byte, 2 byte arrays
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and back. -Nach
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*/
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static unsigned char *uint32_to_bytes(unsigned int num)
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{
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static unsigned char buffer[4];
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buffer[3] = (num >> 24) & 0xFF;
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buffer[2] = (num >> 16) & 0xFF;
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buffer[1] = (num >> 8) & 0xFF;
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buffer[0] = num & 0xFF;
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return(buffer);
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}
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static unsigned int bytes_to_uint32(const unsigned char buffer[4])
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{
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unsigned int num = (unsigned int)buffer[0];
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num |= ((unsigned int)buffer[1]) << 8;
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num |= ((unsigned int)buffer[2]) << 16;
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num |= ((unsigned int)buffer[3]) << 24;
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return(num);
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}
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static unsigned char *uint24_to_bytes(unsigned int num)
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{
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static unsigned char buffer[3];
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buffer[2] = (num >> 16) & 0xFF;
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buffer[1] = (num >> 8) & 0xFF;
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buffer[0] = num & 0xFF;
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return(buffer);
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}
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static unsigned int bytes_to_uint24(const unsigned char buffer[3])
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{
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unsigned int num = (unsigned int)buffer[0];
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num |= ((unsigned int)buffer[1]) << 8;
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num |= ((unsigned int)buffer[2]) << 16;
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return(num);
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}
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static unsigned char *uint16_to_bytes(unsigned short num)
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{
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static unsigned char buffer[2];
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buffer[1] = (num >> 8) & 0xFF;
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buffer[0] = num & 0xFF;
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return(buffer);
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}
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static unsigned short bytes_to_uint16(const unsigned char buffer[2])
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{
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unsigned short num = (unsigned short)buffer[0];
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num |= ((unsigned short)buffer[1]) << 8;
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return(num);
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}
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//Functions to read 2, 3, 4 bytes and convert to uint16, uint24, uint32
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static unsigned short fread2(FILE *fp)
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{
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unsigned char uint16buf[2];
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fread(uint16buf, 2, 1, fp);
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return(bytes_to_uint16(uint16buf));
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}
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static unsigned int fread3(FILE *fp)
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{
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unsigned char uint24buf[3];
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fread(uint24buf, 3, 1, fp);
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return(bytes_to_uint24(uint24buf));
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}
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static unsigned int fread4(FILE *fp)
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{
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unsigned char uint32buf[4];
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fread(uint32buf, 4, 1, fp);
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return(bytes_to_uint32(uint32buf));
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}
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//Functions to write uint16, uint24, uint32 as 2, 3, 4 bytes
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static void fwrite2(unsigned short var, FILE *fp)
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{
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fwrite(uint16_to_bytes(var), 2, 1, fp);
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}
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static void fwrite3(unsigned int var, FILE *fp)
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{
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fwrite(uint24_to_bytes(var), 3, 1, fp);
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}
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static void fwrite4(unsigned int var, FILE *fp)
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{
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fwrite(uint32_to_bytes(var), 4, 1, fp);
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}
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#endif
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