- added code for new network protocol (disabled by default as i need to test this on arm)
This commit is contained in:
Mark Vejvoda
parent
b168f450b5
commit
b4ecc82fba
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@ -0,0 +1,514 @@
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// ==============================================================
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// This file is part of MegaGlest (www.megaglest.org)
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//
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// Copyright (C) 2012 Mark Vejvoda
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//
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// You can redistribute this code and/or modify it under
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// the terms of the GNU General Public License as published
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// by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version
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// ==============================================================
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#include "network_protocol.h"
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#include <stdarg.h>
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#include <cstring>
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#include <ctype.h>
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#include "leak_dumper.h"
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namespace Glest{ namespace Game{
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// macros for packing floats and doubles:
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#define pack754_16(f) (pack754((f), 16, 5))
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#define pack754_32(f) (pack754((f), 32, 8))
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#define pack754_64(f) (pack754((f), 64, 11))
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#define unpack754_16(i) (unpack754((i), 16, 5))
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#define unpack754_32(i) (unpack754((i), 32, 8))
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#define unpack754_64(i) (unpack754((i), 64, 11))
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/*
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** pack754() -- pack a floating point number into IEEE-754 format
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*/
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unsigned long long int pack754(long double f, unsigned bits, unsigned expbits)
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{
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long double fnorm;
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int shift;
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long long sign, exp, significand;
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unsigned significandbits = bits - expbits - 1; // -1 for sign bit
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if (f == 0.0) return 0; // get this special case out of the way
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// check sign and begin normalization
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if (f < 0) { sign = 1; fnorm = -f; }
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else { sign = 0; fnorm = f; }
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// get the normalized form of f and track the exponent
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shift = 0;
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while(fnorm >= 2.0) { fnorm /= 2.0; shift++; }
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while(fnorm < 1.0) { fnorm *= 2.0; shift--; }
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fnorm = fnorm - 1.0;
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// calculate the binary form (non-float) of the significand data
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significand = fnorm * ((1LL<<significandbits) + 0.5f);
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// get the biased exponent
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exp = shift + ((1<<(expbits-1)) - 1); // shift + bias
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// return the final answer
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return (sign<<(bits-1)) | (exp<<(bits-expbits-1)) | significand;
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}
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/*
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** unpack754() -- unpack a floating point number from IEEE-754 format
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*/
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long double unpack754(unsigned long long int i, unsigned bits, unsigned expbits)
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{
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long double result;
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long long shift;
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unsigned bias;
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unsigned significandbits = bits - expbits - 1; // -1 for sign bit
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if (i == 0) return 0.0;
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// pull the significand
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result = (i&((1LL<<significandbits)-1)); // mask
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result /= (1LL<<significandbits); // convert back to float
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result += 1.0f; // add the one back on
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// deal with the exponent
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bias = (1<<(expbits-1)) - 1;
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shift = ((i>>significandbits)&((1LL<<expbits)-1)) - bias;
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while(shift > 0) { result *= 2.0; shift--; }
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while(shift < 0) { result /= 2.0; shift++; }
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// sign it
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result *= (i>>(bits-1))&1? -1.0: 1.0;
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return result;
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}
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/*
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** packi16() -- store a 16-bit int into a char buffer (like htons())
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*/
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void packi16(unsigned char *buf, unsigned int i)
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{
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*buf++ = i>>8; *buf++ = i;
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}
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/*
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** packi32() -- store a 32-bit int into a char buffer (like htonl())
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*/
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void packi32(unsigned char *buf, unsigned long int i)
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{
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*buf++ = i>>24; *buf++ = i>>16;
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*buf++ = i>>8; *buf++ = i;
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}
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/*
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** packi64() -- store a 64-bit int into a char buffer (like htonl())
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*/
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void packi64(unsigned char *buf, unsigned long long int i)
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{
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*buf++ = i>>56; *buf++ = i>>48;
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*buf++ = i>>40; *buf++ = i>>32;
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*buf++ = i>>24; *buf++ = i>>16;
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*buf++ = i>>8; *buf++ = i;
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}
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/*
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** unpacki16() -- unpack a 16-bit int from a char buffer (like ntohs())
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*/
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int unpacki16(unsigned char *buf)
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{
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unsigned int i2 = ((unsigned int)buf[0]<<8) | buf[1];
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int i;
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// change unsigned numbers to signed
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if (i2 <= 0x7fffu) { i = i2; }
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else { i = -1 - (unsigned int)(0xffffu - i2); }
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return i;
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}
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/*
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** unpacku16() -- unpack a 16-bit unsigned from a char buffer (like ntohs())
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*/
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unsigned int unpacku16(unsigned char *buf)
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{
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return ((unsigned int)buf[0]<<8) | buf[1];
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}
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/*
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** unpacki32() -- unpack a 32-bit int from a char buffer (like ntohl())
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*/
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long int unpacki32(unsigned char *buf)
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{
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unsigned long int i2 = ((unsigned long int)buf[0]<<24) |
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((unsigned long int)buf[1]<<16) |
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((unsigned long int)buf[2]<<8) |
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buf[3];
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long int i;
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// change unsigned numbers to signed
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if (i2 <= 0x7fffffffu) { i = i2; }
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else { i = -1 - (long int)(0xffffffffu - i2); }
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return i;
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}
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/*
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** unpacku32() -- unpack a 32-bit unsigned from a char buffer (like ntohl())
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*/
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unsigned long int unpacku32(unsigned char *buf)
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{
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return ((unsigned long int)buf[0]<<24) |
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((unsigned long int)buf[1]<<16) |
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((unsigned long int)buf[2]<<8) |
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buf[3];
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}
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/*
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** unpacki64() -- unpack a 64-bit int from a char buffer (like ntohl())
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*/
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long long int unpacki64(unsigned char *buf)
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{
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unsigned long long int i2 = ((unsigned long long int)buf[0]<<56) |
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((unsigned long long int)buf[1]<<48) |
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((unsigned long long int)buf[2]<<40) |
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((unsigned long long int)buf[3]<<32) |
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((unsigned long long int)buf[4]<<24) |
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((unsigned long long int)buf[5]<<16) |
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((unsigned long long int)buf[6]<<8) |
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buf[7];
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long long int i;
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// change unsigned numbers to signed
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if (i2 <= 0x7fffffffffffffffu) { i = i2; }
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else { i = -1 -(long long int)(0xffffffffffffffffu - i2); }
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return i;
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}
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/*
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** unpacku64() -- unpack a 64-bit unsigned from a char buffer (like ntohl())
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*/
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unsigned long long int unpacku64(unsigned char *buf)
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{
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return ((unsigned long long int)buf[0]<<56) |
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((unsigned long long int)buf[1]<<48) |
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((unsigned long long int)buf[2]<<40) |
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((unsigned long long int)buf[3]<<32) |
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((unsigned long long int)buf[4]<<24) |
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((unsigned long long int)buf[5]<<16) |
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((unsigned long long int)buf[6]<<8) |
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buf[7];
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}
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/*
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** pack() -- store data dictated by the format string in the buffer
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**
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** bits |signed unsigned float string
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** -----+----------------------------------
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** 8 | c C
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** 16 | h H f
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** 32 | l L d
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** 64 | q Q g
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** - | s
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**
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** (16-bit unsigned length is automatically prepended to strings)
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*/
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unsigned int pack(unsigned char *buf, const char *format, ...) {
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va_list ap;
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signed char c; // 8-bit
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unsigned char C;
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int h; // 16-bit
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unsigned int H;
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long int l; // 32-bit
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unsigned long int L;
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long long int q; // 64-bit
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unsigned long long int Q;
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float f; // floats
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double d;
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long double g;
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unsigned long long int fhold;
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char *s; // strings
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unsigned int len;
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unsigned int size = 0;
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unsigned int maxstrlen=0, count;
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va_start(ap, format);
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for(; *format != '\0'; format++) {
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switch(*format) {
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case 'c': // 8-bit
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size += 1;
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c = (signed char)va_arg(ap, int); // promoted
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*buf++ = c;
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break;
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case 'C': // 8-bit unsigned
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size += 1;
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C = (unsigned char)va_arg(ap, unsigned int); // promoted
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*buf++ = C;
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break;
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case 'h': // 16-bit
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size += 2;
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h = va_arg(ap, int);
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packi16(buf, h);
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buf += 2;
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break;
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case 'H': // 16-bit unsigned
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size += 2;
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H = va_arg(ap, unsigned int);
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packi16(buf, H);
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buf += 2;
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break;
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case 'l': // 32-bit
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size += 4;
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l = va_arg(ap, long int);
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packi32(buf, l);
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buf += 4;
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break;
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case 'L': // 32-bit unsigned
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size += 4;
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L = va_arg(ap, unsigned long int);
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packi32(buf, L);
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buf += 4;
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break;
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case 'q': // 64-bit
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size += 8;
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q = va_arg(ap, long long int);
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packi64(buf, q);
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buf += 8;
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break;
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case 'Q': // 64-bit unsigned
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size += 8;
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Q = va_arg(ap, unsigned long long int);
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packi64(buf, Q);
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buf += 8;
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break;
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case 'f': // float-16
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size += 2;
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f = (float)va_arg(ap, double); // promoted
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fhold = pack754_16(f); // convert to IEEE 754
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packi16(buf, fhold);
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buf += 2;
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break;
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case 'd': // float-32
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size += 4;
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d = va_arg(ap, double);
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fhold = pack754_32(d); // convert to IEEE 754
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packi32(buf, fhold);
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buf += 4;
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break;
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case 'g': // float-64
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size += 8;
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g = va_arg(ap, long double);
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fhold = pack754_64(g); // convert to IEEE 754
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packi64(buf, fhold);
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buf += 8;
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break;
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case 's': // string
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s = va_arg(ap, char*);
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len = strlen(s);
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if (maxstrlen > 0 && len < maxstrlen)
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len = maxstrlen - 1;
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size += len + 2;
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packi16(buf, len);
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buf += 2;
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memcpy(buf, s, len);
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buf += len;
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break;
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default:
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if (isdigit(*format)) { // track max str len
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maxstrlen = maxstrlen * 10 + (*format-'0');
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}
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}
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if (!isdigit(*format)) maxstrlen = 0;
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}
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va_end(ap);
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return size;
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}
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/*
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** unpack() -- unpack data dictated by the format string into the buffer
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**
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** bits |signed unsigned float string
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** -----+----------------------------------
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** 8 | c C
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** 16 | h H f
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** 32 | l L d
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** 64 | q Q g
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** - | s
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**
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** (string is extracted based on its stored length, but 's' can be
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** prepended with a max length)
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*/
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unsigned int unpack(unsigned char *buf, const char *format, ...) {
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va_list ap;
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signed char *c; // 8-bit
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unsigned char *C;
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int *h; // 16-bit
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unsigned int *H;
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long int *l; // 32-bit
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unsigned long int *L;
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long long int *q; // 64-bit
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unsigned long long int *Q;
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float *f; // floats
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double *d;
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long double *g;
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unsigned long long int fhold;
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char *s;
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unsigned int len, maxstrlen=0, count;
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unsigned int size = 0;
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va_start(ap, format);
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for(; *format != '\0'; format++) {
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switch(*format) {
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case 'c': // 8-bit
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c = va_arg(ap, signed char*);
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// if (*buf <= 0x7f) {
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// *c = *buf++;
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// size += 1;
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// } // re-sign
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// else {
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// *c = -1 - (unsigned char)(0xffu - *buf);
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// }
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*c = *buf++;
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size += 1;
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break;
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case 'C': // 8-bit unsigned
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C = va_arg(ap, unsigned char*);
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*C = *buf++;
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size += 1;
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break;
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case 'h': // 16-bit
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h = va_arg(ap, int*);
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*h = unpacki16(buf);
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buf += 2;
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size += 2;
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break;
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case 'H': // 16-bit unsigned
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H = va_arg(ap, unsigned int*);
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*H = unpacku16(buf);
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buf += 2;
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size += 2;
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break;
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case 'l': // 32-bit
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l = va_arg(ap, long int*);
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*l = unpacki32(buf);
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buf += 4;
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size += 4;
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break;
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case 'L': // 32-bit unsigned
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L = va_arg(ap, unsigned long int*);
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*L = unpacku32(buf);
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buf += 4;
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size += 4;
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break;
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case 'q': // 64-bit
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q = va_arg(ap, long long int*);
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*q = unpacki64(buf);
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buf += 8;
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size += 8;
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break;
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case 'Q': // 64-bit unsigned
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Q = va_arg(ap, unsigned long long int*);
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*Q = unpacku64(buf);
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buf += 8;
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size += 8;
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break;
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case 'f': // float
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f = va_arg(ap, float*);
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fhold = unpacku16(buf);
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*f = unpack754_16(fhold);
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buf += 2;
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size += 2;
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break;
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case 'd': // float-32
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d = va_arg(ap, double*);
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fhold = unpacku32(buf);
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*d = unpack754_32(fhold);
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buf += 4;
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size += 4;
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break;
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case 'g': // float-64
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g = va_arg(ap, long double*);
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fhold = unpacku64(buf);
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*g = unpack754_64(fhold);
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buf += 8;
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size += 8;
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break;
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case 's': // string
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s = va_arg(ap, char*);
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len = unpacku16(buf);
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buf += 2;
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if (maxstrlen > 0 && len > maxstrlen)
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count = maxstrlen - 1;
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else
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count = len;
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memcpy(s, buf, count);
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s[count] = '\0';
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buf += len;
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size += len;
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break;
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default:
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if (isdigit(*format)) { // track max str len
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maxstrlen = maxstrlen * 10 + (*format-'0');
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}
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}
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if (!isdigit(*format)) maxstrlen = 0;
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}
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va_end(ap);
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return size;
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}
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}}
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@ -0,0 +1,22 @@
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// ==============================================================
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// This file is part of MegaGlest (www.megaglest.org)
|
||||
//
|
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// Copyright (C) 2012 Mark Vejvoda
|
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//
|
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// You can redistribute this code 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
|
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// ==============================================================
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#ifndef NETWORK_PROTOCOL_H_
|
||||
#define NETWORK_PROTOCOL_H_
|
||||
|
||||
namespace Glest{ namespace Game{
|
||||
|
||||
unsigned int pack(unsigned char *buf, const char *format, ...);
|
||||
unsigned int unpack(unsigned char *buf, const char *format, ...);
|
||||
|
||||
}};
|
||||
|
||||
#endif /* NETWORK_PROTOCOL_H_ */
|
||||
Loading…
Reference in New Issue