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- // This may look like C code, but it is really -*- C++ -*-
- /*
- Copyright (C) 1988 Free Software Foundation
- written by Kurt Baudendistel (gt-eedsp!baud@gatech.edu)
- adapted for libg++ by Doug Lea (dl@rocky.oswego.edu)
-
- This file is part of the GNU C++ Library. This library is free
- software; you can redistribute it and/or modify it under the terms of
- the GNU Library General Public License as published by the Free
- Software Foundation; either version 2 of the License, or (at your
- option) any later version. This library 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 Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free Software
- Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- #ifndef _Fix16_h
- #ifdef __GNUG__
- #pragma once
- #pragma interface
- #endif
- #define _Fix16_h 1
-
- #include <stream.h>
- #include <std.h>
-
- // constant definitions
-
- #define Fix16_fs ((double)((unsigned)(1 << 15)))
-
- #define Fix16_msb (1 << 15)
- #define Fix16_m_max ((1 << 15) - 1)
- #define Fix16_m_min ((short)(1 << 15))
-
- #define Fix16_mult Fix16_fs
- #define Fix16_div (1./Fix16_fs)
- #define Fix16_max (1. - .5/Fix16_fs)
- #define Fix16_min (-1.)
-
-
- #define Fix32_fs ((double)((unsigned long)(1 << 31)))
-
- #define Fix32_msb ((unsigned long)(1 << 31))
- #define Fix32_m_max ((long)((1L << 31) - 1L))
- #define Fix32_m_min ((long)(1 << 31))
-
- #define Fix32_mult Fix32_fs
- #define Fix32_div (1./Fix32_fs)
- #define Fix32_max (1. - .5/Fix32_fs)
- #define Fix32_min (-1.)
-
-
- //
- // Fix16 class: 16-bit Fixed point data type
- //
- // consists of a 16-bit mantissa (sign bit & 15 data bits).
- //
-
- class Fix16
- {
- friend class Fix32;
-
- short m;
-
- short round(double d);
- short assign(double d);
- Fix16(short i);
- Fix16(int i);
-
- operator double();
-
-
- public:
- Fix16();
- Fix16(Fix16& f);
- Fix16(double d);
- Fix16(Fix32& f);
-
- ~Fix16();
-
- Fix16& operator=(Fix16& f);
- Fix16& operator=(double d);
- Fix16& operator=(Fix32& f);
-
- friend short& mantissa(Fix16& f);
- friend double value(Fix16& f);
-
- Fix16 operator + ();
- Fix16 operator - ();
-
- friend Fix16 operator + (Fix16& f, Fix16& g);
- friend Fix16 operator - (Fix16& f, Fix16& g);
- friend Fix32 operator * (Fix16& f, Fix16& g);
- friend Fix16 operator / (Fix16& f, Fix16& g);
- friend Fix16 operator << (Fix16& f, int b);
- friend Fix16 operator >> (Fix16& f, int b);
-
- Fix16& operator += (Fix16& f);
- Fix16& operator -= (Fix16& f);
- Fix16& operator *= (Fix16& );
- Fix16& operator /= (Fix16& f);
-
- Fix16& operator <<=(int b);
- Fix16& operator >>=(int b);
-
- friend int operator == (Fix16& f, Fix16& g);
- friend int operator != (Fix16& f, Fix16& g);
- friend int operator >= (Fix16& f, Fix16& g);
- friend int operator <= (Fix16& f, Fix16& g);
- friend int operator > (Fix16& f, Fix16& g);
- friend int operator < (Fix16& f, Fix16& g);
-
- friend istream& operator >> (istream& s, Fix16& f);
- friend ostream& operator << (ostream& s, Fix16& f);
-
- void overflow(short&);
- void range_error(short&);
-
- friend Fix16 operator * (Fix16& f, int g);
- friend Fix16 operator * (int g, Fix16& f);
- Fix16& operator *= (int g);
- };
-
-
- //
- // Fix32 class: 32-bit Fixed point data type
- //
- // consists of a 32-bit mantissa (sign bit & 31 data bits).
- //
-
- class Fix32
- {
- friend class Fix16;
-
- long m;
-
- long round(double d);
- long assign(double d);
-
- Fix32(long i);
- operator double();
-
-
- public:
- Fix32();
- Fix32(Fix32& f);
- Fix32(Fix16& f);
- Fix32(double d);
- ~Fix32();
-
- Fix32& operator = (Fix32& f);
- Fix32& operator = (Fix16& f);
- Fix32& operator = (double d);
-
- friend long& mantissa(Fix32& f);
- friend double value(Fix32& f);
-
- Fix32 operator + ();
- Fix32 operator - ();
-
- friend Fix32 operator + (Fix32& f, Fix32& g);
- friend Fix32 operator - (Fix32& f, Fix32& g);
- friend Fix32 operator * (Fix32& f, Fix32& g);
- friend Fix32 operator / (Fix32& f, Fix32& g);
- friend Fix32 operator << (Fix32& f, int b);
- friend Fix32 operator >> (Fix32& f, int b);
-
- friend Fix32 operator * (Fix16& f, Fix16& g);
-
- Fix32& operator += (Fix32& f);
- Fix32& operator -= (Fix32& f);
- Fix32& operator *= (Fix32& f);
- Fix32& operator /= (Fix32& f);
- Fix32& operator <<=(int b);
- Fix32& operator >>=(int b);
-
- friend int operator == (Fix32& f, Fix32& g);
- friend int operator != (Fix32& f, Fix32& g);
- friend int operator >= (Fix32& f, Fix32& g);
- friend int operator <= (Fix32& f, Fix32& g);
- friend int operator > (Fix32& f, Fix32& g);
- friend int operator < (Fix32& f, Fix32& g);
-
- friend istream& operator >> (istream& s, Fix32& f);
- friend ostream& operator << (ostream& s, Fix32& f);
-
- void overflow(long& i);
- void range_error(long& i);
-
- friend Fix32 operator * (Fix32& f, long g);
- friend Fix32 operator * (long g, Fix32& f);
- Fix32& operator *= (long g);
- };
-
- // active error handler declarations
-
- typedef void (*Fix16_peh)(short&);
- typedef void (*Fix32_peh)(long&);
-
- extern Fix16_peh Fix16_overflow_handler;
- extern Fix32_peh Fix32_overflow_handler;
-
- extern Fix16_peh Fix16_range_error_handler;
- extern Fix32_peh Fix32_range_error_handler;
-
- #if defined(SHORT_NAMES) || defined(VMS)
- #define set_overflow_handler sohndl
- #define set_range_error_handler srnghdl
- #endif
-
-
- // error handler declarations
-
- extern Fix16_peh set_Fix16_overflow_handler(Fix16_peh);
- extern Fix32_peh set_Fix32_overflow_handler(Fix32_peh);
- extern void set_overflow_handler(Fix16_peh, Fix32_peh);
-
- extern Fix16_peh set_Fix16_range_error_handler(Fix16_peh);
- extern Fix32_peh set_Fix32_range_error_handler(Fix32_peh);
- extern void set_range_error_handler(Fix16_peh, Fix32_peh);
-
- extern void
- Fix16_ignore(short&),
- Fix16_overflow_saturate(short&),
- Fix16_overflow_warning_saturate(short&),
- Fix16_warning(short&),
- Fix16_abort(short&);
-
- extern void
- Fix32_ignore(long&),
- Fix32_overflow_saturate(long&),
- Fix32_overflow_warning_saturate(long&),
- Fix32_warning(long&),
- Fix32_abort(long&);
-
- #if defined(__OPTIMIZE__) || defined(USE_LIBGXX_INLINES)
-
- inline Fix16::~Fix16() {}
-
- inline short Fix16::round(double d)
- {
- return short( (d >= 0)? d + 0.5 : d - 0.5);
- }
-
- inline Fix16::Fix16(short i)
- {
- m = i;
- }
-
- inline Fix16::Fix16(int i)
- {
- m = i;
- }
-
- inline Fix16::operator double()
- {
- return Fix16_div * m;
- }
-
- inline Fix16::Fix16()
- {
- m = 0;
- }
-
- inline Fix16::Fix16(Fix16& f)
- {
- m = f.m;
- }
-
- inline Fix16::Fix16(double d)
- {
- m = assign(d);
- }
-
-
- inline Fix16& Fix16::operator=(Fix16& f)
- {
- m = f.m;
- return *this;
- }
-
- inline Fix16& Fix16::operator=(double d)
- {
- m = assign(d);
- return *this;
- }
-
-
- inline Fix32::Fix32()
- {
- m = 0;
- }
-
- inline Fix32::Fix32(long i)
- {
- m = i;
- }
-
- inline Fix32:: operator double()
- {
- return Fix32_div * m;
- }
-
-
- inline Fix32::Fix32(Fix32& f)
- {
- m = f.m;
- }
-
- inline Fix32::Fix32(Fix16& f)
- {
- m = long(f.m) << 16;
- }
-
- inline Fix32::Fix32(double d)
- {
- m = assign(d);
- }
-
- inline Fix16::Fix16(Fix32& f)
- {
- m = f.m >> 16;
- }
-
-
- inline Fix16& Fix16::operator=(Fix32& f)
- {
- m = f.m >> 16;
- return *this;
- }
-
- inline Fix32& Fix32::operator=(Fix32& f)
- {
- m = f.m;
- return *this;
- }
-
- inline Fix32& Fix32::operator=(Fix16& f)
- {
- m = long(f.m) << 16;
- return *this;
- }
-
- inline Fix32& Fix32::operator=(double d)
- {
- m = assign(d);
- return *this;
- }
-
- inline short& mantissa(Fix16& f)
- {
- return f.m;
- }
-
- inline double value(Fix16& f)
- {
- return double(f);
- }
-
- inline Fix16 Fix16::operator+()
- {
- return m;
- }
-
- inline Fix16 Fix16::operator-()
- {
- return -m;
- }
-
- inline Fix16 operator+(Fix16& f, Fix16& g)
- {
- short sum = f.m + g.m;
- if ( (f.m ^ sum) & (g.m ^ sum) & Fix16_msb )
- f.overflow(sum);
- return sum;
- }
-
- inline Fix16 operator-(Fix16& f, Fix16& g)
- {
- short sum = f.m - g.m;
- if ( (f.m ^ sum) & (-g.m ^ sum) & Fix16_msb )
- f.overflow(sum);
- return sum;
- }
-
- inline Fix32 operator*(Fix16& f, Fix16& g)
- {
- return Fix32( long( long(f.m) * long(g.m) << 1));
- }
-
- inline Fix16 operator<<(Fix16& a, int b)
- {
- return a.m << b;
- }
-
- inline Fix16 operator>>(Fix16& a, int b)
- {
- return a.m >> b;
- }
-
- inline Fix16& Fix16:: operator+=(Fix16& f)
- {
- return *this = *this + f;
- }
-
- inline Fix16& Fix16:: operator-=(Fix16& f)
- {
- return *this = *this - f;
- }
-
- inline Fix16& Fix16::operator*=(Fix16& f)
- {
- return *this = *this * f;
- }
-
- inline Fix16& Fix16:: operator/=(Fix16& f)
- {
- return *this = *this / f;
- }
-
- inline Fix16& Fix16:: operator<<=(int b)
- {
- return *this = *this << b;
- }
-
- inline Fix16& Fix16:: operator>>=(int b)
- {
- return *this = *this >> b;
- }
-
- inline int operator==(Fix16& f, Fix16& g)
- {
- return f.m == g.m;
- }
-
- inline int operator!=(Fix16& f, Fix16& g)
- {
- return f.m != g.m;
- }
-
- inline int operator>=(Fix16& f, Fix16& g)
- {
- return f.m >= g.m;
- }
-
- inline int operator<=(Fix16& f, Fix16& g)
- {
- return f.m <= g.m;
- }
-
- inline int operator>(Fix16& f, Fix16& g)
- {
- return f.m > g.m;
- }
-
- inline int operator<(Fix16& f, Fix16& g)
- {
- return f.m < g.m;
- }
-
- inline istream& operator>>(istream& s, Fix16& f)
- {
- double d;
- s >> d;
- f = d;
- return s;
- }
-
- inline ostream& operator<<(ostream& s, Fix16& f)
- {
- return s << double(f);
- }
-
-
- inline Fix16 operator*(Fix16& f, int g)
- {
- return Fix16(short(f.m * g));
- }
-
- inline Fix16 operator*(int g, Fix16& f)
- {
- return f * g;
- }
-
-
- inline Fix16& Fix16::operator*=(int g)
- {
- return *this = *this * g;
- }
-
- inline Fix32::~Fix32() {}
-
- inline long Fix32::round(double d)
- {
- return long( (d >= 0)? d + 0.5 : d - 0.5);
- }
-
-
- inline long& mantissa(Fix32& f)
- {
- return f.m;
- }
-
- inline double value(Fix32& f)
- {
- return double(f);
- }
-
- inline Fix32 Fix32::operator+()
- {
- return m;
- }
-
- inline Fix32 Fix32::operator-()
- {
- return -m;
- }
-
- inline Fix32 operator+(Fix32& f, Fix32& g)
- {
- long sum = f.m + g.m;
- if ( (f.m ^ sum) & (g.m ^ sum) & Fix32_msb )
- f.overflow(sum);
- return sum;
- }
-
- inline Fix32 operator-(Fix32& f, Fix32& g)
- {
- long sum = f.m - g.m;
- if ( (f.m ^ sum) & (-g.m ^ sum) & Fix32_msb )
- f.overflow(sum);
- return sum;
- }
-
- inline Fix32 operator<<(Fix32& a, int b)
- {
- return a.m << b;
- }
-
- inline Fix32 operator>>(Fix32& a, int b)
- {
- return a.m >> b;
- }
-
- inline Fix32& Fix32::operator+=(Fix32& f)
- {
- return *this = *this + f;
- }
-
- inline Fix32& Fix32::operator-=(Fix32& f)
- {
- return *this = *this - f;
- }
-
- inline Fix32& Fix32::operator*=(Fix32& f)
- {
- return *this = *this * f;
- }
-
- inline Fix32& Fix32::operator/=(Fix32& f)
- {
- return *this = *this / f;
- }
-
-
- inline Fix32& Fix32::operator<<=(int b)
- {
- return *this = *this << b;
- }
-
- inline Fix32& Fix32::operator>>=(int b)
- {
- return *this = *this >> b;
- }
-
- inline int operator==(Fix32& f, Fix32& g)
- {
- return f.m == g.m;
- }
-
- inline int operator!=(Fix32& f, Fix32& g)
- {
- return f.m != g.m;
- }
-
- inline int operator>=(Fix32& f, Fix32& g)
- {
- return f.m >= g.m;
- }
-
- inline int operator<=(Fix32& f, Fix32& g)
- {
- return f.m <= g.m;
- }
-
- inline int operator>(Fix32& f, Fix32& g)
- {
- return f.m > g.m;
- }
-
- inline int operator<(Fix32& f, Fix32& g)
- {
- return f.m < g.m;
- }
-
- inline istream& operator>>(istream& s, Fix32& f)
- {
- double d;
- s >> d;
- f = d;
- return s;
- }
-
- inline ostream& operator<<(ostream& s, Fix32& f)
- {
- return s << double(f);
- }
-
- inline Fix32 operator*(Fix32& f, long g)
- {
- return Fix32(long(f.m * g));
- }
-
- inline Fix32 operator*(long g, Fix32& f)
- {
- return f * g;
- }
-
-
-
- inline Fix32& Fix32::operator*=(long g)
- {
- return *this = *this * g;
- }
-
-
- #endif
- #endif
-
-