一个用了两年多的lzo压缩代码，竟然有问题.
2017-08-04 13:33
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一个短短的lzo代码，我使用了两年
今天才发现它有问题，我平时也用zlib和7zip的压缩
这两天编译64位版本，lzo运行就直接崩了，发现它没有考虑到数据类型，并且,它竟然没有初始化应该初始化的数据！
#include "lzo.h"
UINT _do_compress(BYTE *in, UINT in_len, BYTE *out, UINT *out_len, BYTE *buffer)
{
BYTE *ip;
BYTE *op;
BYTE *in_end = in + in_len;
BYTE *ip_end = in + in_len - 13;
BYTE *ii;
UINT *dict = (UINT *)buffer;
BYTE *p; // xy添加的
UINT m_pos;
UINT m_off;
UINT m_len;
UINT dindex;
UINT t;
UINT tt;
BYTE *end;
BYTE *m;
op = out;
ip = in;
ii = ip;
ip += 4;
for (t = 0; t < 0x4000; t++)
{
dict[t] = 0xffffffff;
}
for (;;)
{
dindex = ((0x21 * (((((((UINT)(ip[3]) << 6) ^ ip[2]) << 5) ^ ip[1]) << 5) ^ ip[0])) >> 5) & 0x3fff;
m_pos = dict[dindex];
if (m_pos == 0xffffffff || (m_off = (UINT)(ip - in - m_pos)) == 0 || m_off > 0xbfff)
goto literal;
p = in + m_pos;
if (m_off <= 0x0800 || p[3] == ip[3])
goto try_match;
dindex = (dindex & 0x7ff) ^ 0x201f;
m_pos = dict[dindex];
if (m_pos == 0xffffffff || (m_off = (UINT)(ip - in - m_pos)) == 0 || m_off > 0xbfff)
goto literal;
p = in + m_pos;
if (m_off <= 0x0800 || p[3] == ip[3])
goto try_match;
goto literal;
try_match:
p = in + m_pos;
if (*(USHORT*)p == *(USHORT *)ip && p[2] == ip[2])
goto match;
literal:
dict[dindex] = ip - in;
++ip;
if (ip >= ip_end)
break;
continue;
match:
dict[dindex] = ip - in;
if (ip - ii > 0)
{
t = ip - ii;
if (t <= 3)
{
op[-2] |= (BYTE)t;
}
else if (t <= 18)
{
*op++ = (BYTE)(t - 3);
}
else
{
tt = t - 18;
*op++ = 0;
while (tt > 255)
{
tt -= 255;
*op++ = 0;
}
*op++ = (BYTE)tt;
}
do *op++ = *ii++; while (--t > 0);
}
ip += 3;
p = in + m_pos;
if (p[3] != *ip++ || p[4] != *ip++ || p[5] != *ip++ ||
p[6] != *ip++ || p[7] != *ip++ || p[8] != *ip++)
{
--ip;
m_len = ip - ii;
if (m_off <= 0x0800)
{
--m_off;
*op++ = (BYTE)(((m_len - 1) << 5) | ((m_off & 7) << 2));
*op++ = (BYTE)(m_off >> 3);
}
else
if (m_off <= 0x4000)
{
--m_off;
*op++ = (BYTE)(32 | (m_len - 2));
goto m3_m4_offset;
}
else
{
m_off -= 0x4000;
*op++ = (BYTE)(16 | ((m_off & 0x4000) >> 11) | (m_len - 2));
goto m3_m4_offset;
}
}
else
{
{
end = in_end;
m = p + 9;
while (ip < end && *m == *ip)
m++, ip++;
m_len = (ip - ii);
}
if (m_off <= 0x4000)
{
--m_off;
if (m_len <= 33)
*op++ = (BYTE)(32 | (m_len - 2));
else
{
m_len -= 33;
*op++ = 32;
goto m3_m4_len;
}
}
else
{
m_off -= 0x4000;
if (m_len <= 9)
*op++ = (BYTE)(16 | ((m_off & 0x4000) >> 11) | (m_len - 2));
else
{
m_len -= 9;
*op++ = (BYTE)(16 | ((m_off & 0x4000) >> 11));
m3_m4_len:
while (m_len > 255)
{
m_len -= 255;
*op++ = 0;
}
*op++ = (BYTE)m_len;
}
}
m3_m4_offset:
*op++ = (BYTE)((m_off & 63) << 2);
*op++ = (BYTE)(m_off >> 6);
}
ii = ip;
if (ip >= ip_end)
break;
}
*out_len = op - out;
return (UINT)(in_end - ii);
}
UINT WINAPI lzo_compress(void *in, UINT in_len, void *out, BYTE *buffer)
{
BYTE *op = (BYTE *)out;
UINT t, out_len;
UINT tt;
BYTE *ii;
if (in_len <= 13)
t = in_len;
else
{
t = _do_compress((BYTE *)in, in_len, (BYTE *)op, &out_len, buffer);
op += out_len;
}
if (t > 0)
{
ii = (BYTE*)in + in_len - t;
if (op == (BYTE*)out && t <= 238)
*op++ = (BYTE)(17 + t);
else
if (t <= 3)
op[-2] |= (BYTE)t;
else
if (t <= 18)
*op++ = (BYTE)(t - 3);
else
{
tt = t - 18;
*op++ = 0;
while (tt > 255)
{
tt -= 255;
*op++ = 0;
}
*op++ = (BYTE)tt;
}
do *op++ = *ii++; while (--t > 0);
}
*op++ = 17;
*op++ = 0;
*op++ = 0;
return (op - (BYTE*)out);
}
UINT WINAPI lzo_decompress(void *in, UINT in_len, void *out)
{
BYTE *op;
BYTE *ip;
UINT t;
BYTE *m_pos;
BYTE *ip_end;
ip_end = (BYTE*)in + in_len;
op = (BYTE *)out;
ip = (BYTE *)in;
if (*ip > 17)
{
t = *ip++ - 17;
if (t < 4)
goto match_next;
do *op++ = *ip++; while (--t > 0);
goto first_literal_run;
}
for (;;)
{
t = *ip++;
if (t >= 16) goto match;
if (t == 0)
{
while (*ip == 0)
{
t += 255;
ip++;
}
t += 15 + *ip++;
}
*(UINT *)op = *(UINT *)ip;
op += 4; ip += 4;
if (--t > 0)
{
if (t >= 4)
{
do
{
*(UINT *)op = *(UINT *)ip;
op += 4; ip += 4; t -= 4;
} while (t >= 4);
if (t > 0) do *op++ = *ip++; while (--t > 0);
}
else
do *op++ = *ip++; while (--t > 0);
}
first_literal_run:
t = *ip++;
if (t >= 16)
goto match;
m_pos = op - 0x0801;
m_pos -= t >> 2;
m_pos -= *ip++ << 2;
*op++ = *m_pos++; *op++ = *m_pos++; *op++ = *m_pos;
goto match_done;
for (;;)
{
match:
if (t >= 64)
{
m_pos = op - 1;
m_pos -= (t >> 2) & 7;
m_pos -= *ip++ << 3;
t = (t >> 5) - 1;
goto copy_match;
}
else
if (t >= 32)
{
t &= 31;
if (t == 0)
{
while (*ip == 0)
{
t += 255;
ip++;
}
t += 31 + *ip++;
}
m_pos = op - 1;
m_pos -= (*(USHORT *)ip) >> 2;
ip += 2;
}
else
if (t >= 16)
{
m_pos = op;
m_pos -= (t & 8) << 11;
t &= 7;
if (t == 0)
{
while (*ip == 0)
{
t += 255;
ip++;
}
t += 7 + *ip++;
}
m_pos -= (*(USHORT *)ip) >> 2;
ip += 2;
if (m_pos == op)
goto eof_found;
m_pos -= 0x4000;
}
else
{
m_pos = op - 1;
m_pos -= t >> 2;
m_pos -= *ip++ << 2;
*op++ = *m_pos++; *op++ = *m_pos;
goto match_done;
}
if (t >= 6 && (op - m_pos) >= 4)
{
*(UINT *)op = *(UINT *)m_pos;
op += 4; m_pos += 4; t -= 2;
do
{
*(UINT *)op = *(UINT *)m_pos;
op += 4; m_pos += 4; t -= 4;
} while (t >= 4);
if (t > 0)
do *op++ = *m_pos++; while (--t > 0);
}
else
{
copy_match:
*op++ = *m_pos++; *op++ = *m_pos++;
do *op++ = *m_pos++; while (--t > 0);
}
match_done:
t = ip[-2] & 3;
if (t == 0) break;
match_next:
do *op++ = *ip++; while (--t > 0);
t = *ip++;
}
}
eof_found:
if (ip != ip_end) return -1;
return (op - (BYTE*)out);
}
今天才发现它有问题，我平时也用zlib和7zip的压缩
这两天编译64位版本，lzo运行就直接崩了，发现它没有考虑到数据类型，并且,它竟然没有初始化应该初始化的数据！
#include "lzo.h"
UINT _do_compress(BYTE *in, UINT in_len, BYTE *out, UINT *out_len, BYTE *buffer)
{
BYTE *ip;
BYTE *op;
BYTE *in_end = in + in_len;
BYTE *ip_end = in + in_len - 13;
BYTE *ii;
UINT *dict = (UINT *)buffer;
BYTE *p; // xy添加的
UINT m_pos;
UINT m_off;
UINT m_len;
UINT dindex;
UINT t;
UINT tt;
BYTE *end;
BYTE *m;
op = out;
ip = in;
ii = ip;
ip += 4;
for (t = 0; t < 0x4000; t++)
{
dict[t] = 0xffffffff;
}
for (;;)
{
dindex = ((0x21 * (((((((UINT)(ip[3]) << 6) ^ ip[2]) << 5) ^ ip[1]) << 5) ^ ip[0])) >> 5) & 0x3fff;
m_pos = dict[dindex];
if (m_pos == 0xffffffff || (m_off = (UINT)(ip - in - m_pos)) == 0 || m_off > 0xbfff)
goto literal;
p = in + m_pos;
if (m_off <= 0x0800 || p[3] == ip[3])
goto try_match;
dindex = (dindex & 0x7ff) ^ 0x201f;
m_pos = dict[dindex];
if (m_pos == 0xffffffff || (m_off = (UINT)(ip - in - m_pos)) == 0 || m_off > 0xbfff)
goto literal;
p = in + m_pos;
if (m_off <= 0x0800 || p[3] == ip[3])
goto try_match;
goto literal;
try_match:
p = in + m_pos;
if (*(USHORT*)p == *(USHORT *)ip && p[2] == ip[2])
goto match;
literal:
dict[dindex] = ip - in;
++ip;
if (ip >= ip_end)
break;
continue;
match:
dict[dindex] = ip - in;
if (ip - ii > 0)
{
t = ip - ii;
if (t <= 3)
{
op[-2] |= (BYTE)t;
}
else if (t <= 18)
{
*op++ = (BYTE)(t - 3);
}
else
{
tt = t - 18;
*op++ = 0;
while (tt > 255)
{
tt -= 255;
*op++ = 0;
}
*op++ = (BYTE)tt;
}
do *op++ = *ii++; while (--t > 0);
}
ip += 3;
p = in + m_pos;
if (p[3] != *ip++ || p[4] != *ip++ || p[5] != *ip++ ||
p[6] != *ip++ || p[7] != *ip++ || p[8] != *ip++)
{
--ip;
m_len = ip - ii;
if (m_off <= 0x0800)
{
--m_off;
*op++ = (BYTE)(((m_len - 1) << 5) | ((m_off & 7) << 2));
*op++ = (BYTE)(m_off >> 3);
}
else
if (m_off <= 0x4000)
{
--m_off;
*op++ = (BYTE)(32 | (m_len - 2));
goto m3_m4_offset;
}
else
{
m_off -= 0x4000;
*op++ = (BYTE)(16 | ((m_off & 0x4000) >> 11) | (m_len - 2));
goto m3_m4_offset;
}
}
else
{
{
end = in_end;
m = p + 9;
while (ip < end && *m == *ip)
m++, ip++;
m_len = (ip - ii);
}
if (m_off <= 0x4000)
{
--m_off;
if (m_len <= 33)
*op++ = (BYTE)(32 | (m_len - 2));
else
{
m_len -= 33;
*op++ = 32;
goto m3_m4_len;
}
}
else
{
m_off -= 0x4000;
if (m_len <= 9)
*op++ = (BYTE)(16 | ((m_off & 0x4000) >> 11) | (m_len - 2));
else
{
m_len -= 9;
*op++ = (BYTE)(16 | ((m_off & 0x4000) >> 11));
m3_m4_len:
while (m_len > 255)
{
m_len -= 255;
*op++ = 0;
}
*op++ = (BYTE)m_len;
}
}
m3_m4_offset:
*op++ = (BYTE)((m_off & 63) << 2);
*op++ = (BYTE)(m_off >> 6);
}
ii = ip;
if (ip >= ip_end)
break;
}
*out_len = op - out;
return (UINT)(in_end - ii);
}
UINT WINAPI lzo_compress(void *in, UINT in_len, void *out, BYTE *buffer)
{
BYTE *op = (BYTE *)out;
UINT t, out_len;
UINT tt;
BYTE *ii;
if (in_len <= 13)
t = in_len;
else
{
t = _do_compress((BYTE *)in, in_len, (BYTE *)op, &out_len, buffer);
op += out_len;
}
if (t > 0)
{
ii = (BYTE*)in + in_len - t;
if (op == (BYTE*)out && t <= 238)
*op++ = (BYTE)(17 + t);
else
if (t <= 3)
op[-2] |= (BYTE)t;
else
if (t <= 18)
*op++ = (BYTE)(t - 3);
else
{
tt = t - 18;
*op++ = 0;
while (tt > 255)
{
tt -= 255;
*op++ = 0;
}
*op++ = (BYTE)tt;
}
do *op++ = *ii++; while (--t > 0);
}
*op++ = 17;
*op++ = 0;
*op++ = 0;
return (op - (BYTE*)out);
}
UINT WINAPI lzo_decompress(void *in, UINT in_len, void *out)
{
BYTE *op;
BYTE *ip;
UINT t;
BYTE *m_pos;
BYTE *ip_end;
ip_end = (BYTE*)in + in_len;
op = (BYTE *)out;
ip = (BYTE *)in;
if (*ip > 17)
{
t = *ip++ - 17;
if (t < 4)
goto match_next;
do *op++ = *ip++; while (--t > 0);
goto first_literal_run;
}
for (;;)
{
t = *ip++;
if (t >= 16) goto match;
if (t == 0)
{
while (*ip == 0)
{
t += 255;
ip++;
}
t += 15 + *ip++;
}
*(UINT *)op = *(UINT *)ip;
op += 4; ip += 4;
if (--t > 0)
{
if (t >= 4)
{
do
{
*(UINT *)op = *(UINT *)ip;
op += 4; ip += 4; t -= 4;
} while (t >= 4);
if (t > 0) do *op++ = *ip++; while (--t > 0);
}
else
do *op++ = *ip++; while (--t > 0);
}
first_literal_run:
t = *ip++;
if (t >= 16)
goto match;
m_pos = op - 0x0801;
m_pos -= t >> 2;
m_pos -= *ip++ << 2;
*op++ = *m_pos++; *op++ = *m_pos++; *op++ = *m_pos;
goto match_done;
for (;;)
{
match:
if (t >= 64)
{
m_pos = op - 1;
m_pos -= (t >> 2) & 7;
m_pos -= *ip++ << 3;
t = (t >> 5) - 1;
goto copy_match;
}
else
if (t >= 32)
{
t &= 31;
if (t == 0)
{
while (*ip == 0)
{
t += 255;
ip++;
}
t += 31 + *ip++;
}
m_pos = op - 1;
m_pos -= (*(USHORT *)ip) >> 2;
ip += 2;
}
else
if (t >= 16)
{
m_pos = op;
m_pos -= (t & 8) << 11;
t &= 7;
if (t == 0)
{
while (*ip == 0)
{
t += 255;
ip++;
}
t += 7 + *ip++;
}
m_pos -= (*(USHORT *)ip) >> 2;
ip += 2;
if (m_pos == op)
goto eof_found;
m_pos -= 0x4000;
}
else
{
m_pos = op - 1;
m_pos -= t >> 2;
m_pos -= *ip++ << 2;
*op++ = *m_pos++; *op++ = *m_pos;
goto match_done;
}
if (t >= 6 && (op - m_pos) >= 4)
{
*(UINT *)op = *(UINT *)m_pos;
op += 4; m_pos += 4; t -= 2;
do
{
*(UINT *)op = *(UINT *)m_pos;
op += 4; m_pos += 4; t -= 4;
} while (t >= 4);
if (t > 0)
do *op++ = *m_pos++; while (--t > 0);
}
else
{
copy_match:
*op++ = *m_pos++; *op++ = *m_pos++;
do *op++ = *m_pos++; while (--t > 0);
}
match_done:
t = ip[-2] & 3;
if (t == 0) break;
match_next:
do *op++ = *ip++; while (--t > 0);
t = *ip++;
}
}
eof_found:
if (ip != ip_end) return -1;
return (op - (BYTE*)out);
}
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