From 82023866ab4c7483652e9d4605290e39ced3bec3 Mon Sep 17 00:00:00 2001
From: Magnus Auvinen <magnus.auvinen@gmail.com>
Date: Thu, 24 May 2007 20:54:08 +0000
Subject: large change. moved around all source. splitted server and client
 into separate files

---
 src/lzw.cpp | 223 ------------------------------------------------------------
 1 file changed, 223 deletions(-)
 delete mode 100644 src/lzw.cpp

(limited to 'src/lzw.cpp')

diff --git a/src/lzw.cpp b/src/lzw.cpp
deleted file mode 100644
index 80dd1c22..00000000
--- a/src/lzw.cpp
+++ /dev/null
@@ -1,223 +0,0 @@
-#include <string.h>
-
-// LZW Compressor
-struct SYM
-{
-	unsigned char *data;
-	int size;
-	int next;
-};
-
-struct SYMBOLS
-{
-	SYM syms[512];
-	int jumptable[256];
-	int currentsym;
-};
-
-static SYMBOLS symbols;
-
-// symbol info
-inline int sym_size(int i) { return symbols.syms[i].size; }
-inline unsigned char *sym_data(int i) { return symbols.syms[i].data; }
-
-static void sym_index(int sym)
-{
-	int table = symbols.syms[sym].data[0];
-	symbols.syms[sym].next = symbols.jumptable[table];
-	symbols.jumptable[table] = sym;
-}
-
-static void sym_unindex(int sym)
-{
-	int table = symbols.syms[sym].data[0];
-	int prev = -1;
-	int current = symbols.jumptable[table];
-
-	while(current != -1)
-	{
-		if(current == sym)
-		{
-			if(prev != -1)
-				symbols.syms[prev].next = symbols.syms[current].next;
-			else
-				symbols.jumptable[table] = symbols.syms[current].next;
-			break;
-		}
-
-		prev = current;
-		current = symbols.syms[current].next;
-	}
-}
-
-static int sym_add(unsigned char *sym, long len)
-{
-	int i = 256+symbols.currentsym;
-	symbols.syms[i].data = sym;
-	symbols.syms[i].size = len;
-	symbols.currentsym = (symbols.currentsym+1)%255;
-	return i;
-}
-
-static int sym_add_and_index(unsigned char *sym, long len)
-{
-	if(symbols.syms[256+symbols.currentsym].size)
-		sym_unindex(256+symbols.currentsym);
-	int s = sym_add(sym, len);
-	sym_index( s);
-	return s;
-}
-
-static void sym_init()
-{
-	static unsigned char table[256];
-	for(int i = 0; i < 256; i++)
-	{
-		table[i] = i;
-		symbols.syms[i].data = &table[i];
-		symbols.syms[i].size = 1;
-		symbols.jumptable[i] = -1;
-	}
-
-	for(int i = 0; i < 512; i++)
-		symbols.syms[i].next = -1;
-
-	/*
-	// insert some symbols to start with
-	static unsigned char zeros[8] = {0,0,0,0,0,0,0,0};
-	//static unsigned char one1[4] = {0,0,0,1};
-	//static unsigned char one2[4] = {1,0,0,0};
-	sym_add_and_index(zeros, 2);
-	sym_add_and_index(zeros, 3);
-	sym_add_and_index(zeros, 4);
-	sym_add_and_index(zeros, 5);
-	sym_add_and_index(zeros, 6);
-	sym_add_and_index(zeros, 7);
-	sym_add_and_index(zeros, 8);
-	
-	//sym_add_and_index(one1, 4);
-	//sym_add_and_index(one2, 4);*/
-
-	symbols.currentsym = 0;
-}
-
-static int sym_find(unsigned char *data, int size, int avoid)
-{
-	int best = data[0];
-	int bestlen = 1;
-	int current = symbols.jumptable[data[0]];
-
-	while(current != -1)
-	{
-		if(current != avoid && symbols.syms[current].size <= size && memcmp(data, symbols.syms[current].data, symbols.syms[current].size) == 0)
-		{
-			if(bestlen < symbols.syms[current].size)
-			{
-				bestlen = symbols.syms[current].size;
-				best = current;
-			}
-		}
-
-		current = symbols.syms[current].next;
-	}		
-
-	return best;
-}
-
-//
-// compress
-//
-long lzw_compress(const void *src_, int size, void *dst_)
-{
-	unsigned char *src = (unsigned char *)src_;
-	unsigned char *end = (unsigned char *)src_+size;
-	unsigned char *dst = (unsigned char *)dst_;
-	long left = (end-src);
-	int lastsym = -1;
-
-	// init symboltable
-	sym_init();
-
-	bool done = false;
-	while(!done)
-	{
-		unsigned char *flagptr = dst;
-		unsigned char flagbits = 0;
-		int b = 0;
-
-		dst++; // skip a byte where the flags are
-
-		for(; b < 8; b++)
-		{
-			if(left <= 0) // check for EOF
-			{
-				// write EOF symbol
-				flagbits |= 1<<b;
-				*dst++ = 255;
-				done = true;
-				break;
-			}
-
- 			int sym = sym_find(src, left, lastsym);
-			int symsize = sym_size( sym);
-
-			if(sym&0x100)
-				flagbits |= 1<<b; // add bit that says that its a symbol
-
-			*dst++ = sym&0xff; // set symbol
-
-			if(left > symsize+1) // create new symbol
-				lastsym = sym_add_and_index(src, symsize+1);
-			
-			src += symsize; // advance src
-			left -= symsize;
-		}
-
-		// write the flags
-		*flagptr = flagbits;
-	}
-
-	return (long)(dst-(unsigned char*)dst_);
-}
-
-//
-// decompress
-//
-long lzw_decompress(const void *src_, void *dst_)
-{
-	unsigned char *src = (unsigned char *)src_;
-	unsigned char *dst = (unsigned char *)dst_;
-	unsigned char *prevdst = 0;
-	int prevsize = -1;
-	int item;
-
-	sym_init();
-
-	while(1)
-	{
-		unsigned char flagbits = 0;
-		flagbits = *src++; // read flags
-
-		int b = 0;
-		for(; b < 8; b++)
-		{
-			item = *src++;
-			if(flagbits&(1<<b))
-				item |= 256;
-
-			if(item == 0x1ff) // EOF symbol
-				return (dst-(unsigned char *)dst_);
-
-			if(prevdst) // this one could be removed
-				sym_add(prevdst, prevsize+1);
-				
-			memcpy(dst, sym_data(item), sym_size(item));
-			prevdst = dst;
-			prevsize = sym_size(item);
-			dst += sym_size(item);
-		}
-
-	}
-
-	return 0;
-}
-- 
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