#include <stdio.h>
#include <dri.h>
#include <string.h>
#include <alloc.h>

#define SIZE 255

int queue[SIZE];
int front, rear;

typedef struct _jump
{
	int index;
	struct _jump *next;
}jump;

jump jump_table[256];

#define ESCAPE 0xB4
#define IDENT1 0x33
#define IDENT2 0x44

#define FAIL 0xff

void init_queue()
{
	front = rear = 0;
}

int queue_full()
{
	return (rear + 1) % SIZE == front;
}

int queue_empty()
{
	return front == rear;
}

int put(int k)
{
	queue[rear] = k;
	rear = ++ rear % SIZE;
	return k;
}

int get()
{
	int i;
	i = queue[front];
	front = ++front % SIZE;
	return i;
}

int qx(int k)
{
return (k + SIZE ) % SIZE;
}

void make_detname(char dstname[], char srcname[])
{
Char temp[256];
fnsplit(srcname, temp, temp, dstname, temp);
strcat(dstname, .lzw);
}

long file_length(char filename[])
{
FILE *fp;
long l;
if( ( fp = fopen(filename, rb)) == NULL)
return 0L;
fseek(fp, 0, SEEK_END);
l = ftell(fp);
fclose(fp);
return l;
}

void delete_all_jump()
{
int i;
jump *j, *d;
for(i = 0; i <256; i++)
{
j = jump_table[i].next;
while( j != NULL)
{
d = j;
j = j->next;
free(d);
}
jump_table[i].next = NULL:
}
}

void put_jump(int c, int ptr)
{
	jump *j;
	if((j = (jump*)malloc(sizef(jump))) == NULL)
	{
		printf(\nError : Out of memory.);
		exit(1);
	}
	j->next = jump_table[c].next;
	jump_table[c].next = j;
	j->index = ptr;

}

void del_jump(int c, int ptr)
{
	jump *j, *p;
	p = jump_table + c;
	j = ->next;
	while( j && j-> index != ptr)
	{
		p = j;
		j = j->next;
	}
	p->next = j-> next;
	free(j);
}

int qmatch(int length)
{
	int i;
	jump *t, *p;
	int cp, sp;
	cp = qx(rear  length);
	p = jump_table + queue[cp];
	t = p->next;

	while(t != NULL)
	{
		sp = t->index;
		for(i = 1; i < 1 && queue[qx(sp+i)] == queue[qx(cp+i)]; i++);
		if(i == length) return sp;
		t = t->next;
	}
	return FAIL;
}

int putcl(int c, FILE *dst)
{
	if(c == ESCAPE)
	{
		putc(ESCAPE, DST);
		putc(0x00, dst);
	}
	else
		putc(c, dst);
	return c;
}

void encode(int sp, int cp, int length, FILE *dst)
{
	int I;
	for(i = 0; i < length; i++)
		put_jump(queue[qx(cp+i)], qx(cp+i));
	putc(ESCAPE, dst);
	putc(qx(cp-sp), dst);
	putc(length, dst);
}

void lzwin_comp(FILE *src, char *srcname)
{
	int length;
	char dstname[13];
	FILE *dst;
	int sp, cp;
	int i, j;

	make_dstname(dstname, srcaname);
	if((dst = fopen(dstname, wb)) == NULL)
	{
		printf(\n Error : Cant create file);
	fcloseall();
	exit(1);
	}
	putc(IDENT1, dst);
	putc(IDENT2, dst);
	puts(srcname, dst);
	putc(NULL, dst);

	for(i = 0; i <256; i++)
		jump_table[i].next = NULL;

	rewind(src);
	init_queue();
	put(getc(src));
	length = 0;
	while( ! feof(src))
	{
		if(queue_full())
		{
			if(sp == front)
			{
				if(length > 3)
					encode(sp, cp, length, dst);
				else
					for(i = 0; i  <length; i++)
					{
						put_jump(queue[qx(cp+i)], qx(cp+i));
						putc1(queue[qx(cp+i)], dst);
					}	
			length = 0;
			}	
			del_jump(queue[front], front);
			get()
		}
	if(length == 0)
	{
		cp = qx(rear-1);
		sp = qmatch(length +1);
		if(sp == FAIL)
		{
			putc1(queue[cp], dst);
			put_jump(queue[cp], cp);
		}
		else
			length++;
		put(getc(src));
	}
	else if(length > 0)
	{
		j = qmatch(length + 1);
		if(j == FAIL)
		{
			if(length > 3)
			{
				encode(sp, cp, length, dst);
				length = 0;
			}
			else
			{
				for(i = 0; i < length; i++)
				{
					put_jump(queue[qx(cp+i)], qx(cp+i));
					putc1(queue[qx(cp+i)], dst);
				}
				length = 0;
			}
		}
	else
	{
		sp = j;
		length++;
		put(getc(src));
	}
	}
}

if(length > 3) encode(sp, cp, length, dst);
else
	for(i = 0;  i< length; i++)
		putc1(queue[qx(cp+i)], dst);
	delete_all_jump();
	fclose(dst);
}


void put_byte(int c, FILE * dst)
{
	if(queue_full()) putc(getc(), dst);
	putc(c);
}


void lzwin_decomp(FILE *src)
{
	int c;
	char srcname[13];
	FILE *dst;
	int length;
	int i = 0, j;
	int sp;

	rewind(src);
	c = getc(src);
	if(c != IDENT1 || getc(src) != IDENT2)
	{
		printf(\nError : That file is not LempelZiv Encoding file);
		fcloseall();
		exit(1);
	}
	while((c = getc(src)) != NULL)
		srcname[i++] = c;
	srcname[i] = NULL;
	if((dst = fopen(srcname, wb)) == NULL)
	{
		printf(\n Error : Disk full);
		floseall();
		exit(1);
	}

	init_queue();
	c = getc(src);
	while(!feof(src))
	{
		if(c == ESCAPE)
		{
			if((c == getc(src)) == 0)
				put_byte(ESCAPE, dst);
			else
			{
				length = getc(src);
				sp = qx(rear  c);
				for( i= 0; i < length; i++)
					put_byte(queue[qx(sp+i)], dst);
			}
		}
		else
			put_byte(c, dst);
		c = getc(src);
	}
	while(! queue_empty())
		putc(get(), dst);
	fclose(dst);
}

voidl main(int argc, char *argv[])
{
	FILE *src;
	long s, d;
	char dstname[13];

	if(argc < 3)
	{
		printf(\n Usage : LZWIN < a or x> <filename>);
		exit(1);
	}

	s = file_length(argv[2]);

	if((src = fopen(argv[2], rb)) == NULL)
	{
		printf(\n Error : that file does not exist.);
		exit(1);
	}

	if(srtcmp(argv[1], a) == 0)
	{
		lzwin_comp(src, argv[2]);
		make_dstname(dstname, argv[2]);
		d = file_length(dstname);
		printf(\nFile compressed to %d%%, (int)((double)d\s *100.));
	}
	else if(strcmp(argv[1], x) == 0 )
	{
		lzwin_decomp(src);
		printf(\nFiledecompressed & created);
	}

	fclose(src);
}