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C/C++ code:

/*
by Flea
*/
int LZSSDecode(unsigned char * in,unsigned char * out,int szin,int szout)
{
szin = szin > 0? szin: 0x7fffffff;
int i, j, k, r = 0, pr, pi = 0,po = 0;
unsigned int flags = 0;
unsigned char buf[0x100F], c;
for (i = 0; i < 0x100F; buf[i] = 0x20, i++);
while (pi < szin && po < szout)
{
if (((flags >>= 1) & 256) == 0)
{
if(pi >= szin)break;
c = in[pi++];
flags = c | 0xff00;
}
if (flags & 1)
{
if(pi >= szin || po >= szout)break;
c = in[pi++];
out[po++] = c;
buf[r++] = c;
r &= 0xfff;
} else
{
if(pi + 1 >= szin)break;
i = in[pi++];
j = in[pi++];
i |= (j & 0xf0) << 4;
j = (j & 0x0f) + 2;
pr = r;
for (k = 0; k <= j; k++)
{
c = buf[(pr - i + k) & 0xfff];
if(po >= szout)break;
out[po++] = c;
buf[r++] = c;