unsigned int
lzf_decompress (const void *const in_data, unsigned int in_len,
void *out_data, unsigned int out_len)
{
u8 const *ip = (const u8 *)in_data;
u8 *op = (u8 *)out_data;
u8 const *const in_end = ip + in_len;
u8 *const out_end = op + out_len;
do
{
unsigned int ctrl = *ip++;
if (ctrl < (1 << 5)) /* literal run */
{
ctrl++;
if (op + ctrl > out_end)
{
SET_ERRNO (E2BIG);
return 0;
}
#if CHECK_INPUT
if (ip + ctrl > in_end)
{
SET_ERRNO (EINVAL);
return 0;
}
#endif
#ifdef lzf_movsb
lzf_movsb (op, ip, ctrl);
#else
do
*op++ = *ip++;
while (--ctrl);
#endif
}
else /* back reference */
{
unsigned int len = ctrl >> 5;
u8 *ref = op - ((ctrl & 0x1f) << 8) - 1;
#if CHECK_INPUT
if (ip >= in_end)
{
SET_ERRNO (EINVAL);
return 0;
}
#endif
if (len == 7)
{
len += *ip++;
#if CHECK_INPUT
if (ip >= in_end)
{
SET_ERRNO (EINVAL);
return 0;
}
#endif
}
ref -= *ip++;
if (op + len + 2 > out_end)
{
SET_ERRNO (E2BIG);
return 0;
}
if (ref < (u8 *)out_data)
{
SET_ERRNO (EINVAL);
return 0;
}
#ifdef lzf_movsb
len += 2;
lzf_movsb (op, ref, len);
#else
*op++ = *ref++;
*op++ = *ref++;
do
*op++ = *ref++;
while (--len);
#endif
}
}
while (ip < in_end);
return op - (u8 *)out_data;
}
unsigned int lzf_decompress (FAR const void *const in_data,
unsigned int in_len, FAR void *out_data,
unsigned int out_len)
{
FAR uint8_t const *ip = (const uint8_t *)in_data;
FAR uint8_t *op = (uint8_t *)out_data;
FAR uint8_t const *const in_end = ip + in_len;
FAR uint8_t *const out_end = op + out_len;
do
{
unsigned int ctrl = *ip++;
if (ctrl < (1 << 5)) /* literal run */
{
ctrl++;
if (op + ctrl > out_end)
{
set_errno(E2BIG);
return 0;
}
#if CHECK_INPUT
if (ip + ctrl > in_end)
{
set_errno(EINVAL);
return 0;
}
#endif
#ifdef lzf_movsb
lzf_movsb(op, ip, ctrl);
#else
switch (ctrl)
{
case 32:
*op++ = *ip++;
case 31:
*op++ = *ip++;
case 30:
*op++ = *ip++;
case 29:
*op++ = *ip++;
case 28:
*op++ = *ip++;
case 27:
*op++ = *ip++;
case 26:
*op++ = *ip++;
case 25:
*op++ = *ip++;
case 24:
*op++ = *ip++;
case 23:
*op++ = *ip++;
case 22:
*op++ = *ip++;
case 21:
*op++ = *ip++;
case 20:
*op++ = *ip++;
case 19:
*op++ = *ip++;
case 18:
*op++ = *ip++;
case 17:
*op++ = *ip++;
case 16:
*op++ = *ip++;
case 15:
*op++ = *ip++;
case 14:
*op++ = *ip++;
case 13:
*op++ = *ip++;
case 12:
*op++ = *ip++;
case 11:
*op++ = *ip++;
case 10:
*op++ = *ip++;
case 9:
*op++ = *ip++;
case 8:
*op++ = *ip++;
case 7:
*op++ = *ip++;
case 6:
*op++ = *ip++;
case 5:
*op++ = *ip++;
case 4:
*op++ = *ip++;
case 3:
*op++ = *ip++;
case 2:
*op++ = *ip++;
case 1:
*op++ = *ip++;
}
#endif
}
else /* back reference */
{
unsigned int len = ctrl >> 5;
FAR uint8_t *ref = op - ((ctrl & 0x1f) << 8) - 1;
#if CHECK_INPUT
if (ip >= in_end)
{
set_errno(EINVAL);
return 0;
}
#endif
if (len == 7)
{
len += *ip++;
#if CHECK_INPUT
if (ip >= in_end)
{
set_errno(EINVAL);
return 0;
}
#endif
}
ref -= *ip++;
if (op + len + 2 > out_end)
{
set_errno(E2BIG);
return 0;
}
if (ref < (uint8_t *)out_data)
{
set_errno(EINVAL);
return 0;
}
#ifdef lzf_movsb
len += 2;
lzf_movsb(op, ref, len);
#else
switch (len)
{
default:
len += 2;
if (op >= ref + len)
{
/* Disjunct areas */
memcpy (op, ref, len);
op += len;
}
else
{
/* Overlapping, use octet by octet copying */
do
{
*op++ = *ref++;
}
while (--len);
}
break;
case 9:
*op++ = *ref++;
case 8:
*op++ = *ref++;
case 7:
*op++ = *ref++;
case 6:
*op++ = *ref++;
case 5:
*op++ = *ref++;
case 4:
*op++ = *ref++;
case 3:
*op++ = *ref++;
case 2:
*op++ = *ref++;
case 1:
*op++ = *ref++;
case 0:
/* Two octets more */
*op++ = *ref++;
*op++ = *ref++;
}
#endif
}
}
while (ip < in_end);
return op - (uint8_t *)out_data;
}