mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-15 02:41:59 +00:00
77 lines
1.4 KiB
C++
77 lines
1.4 KiB
C++
#pragma once
|
|
|
|
#include <Common/hex.h>
|
|
|
|
namespace DB
|
|
{
|
|
|
|
static void inline hexStringDecode(const char * pos, const char * end, char *& out, size_t word_size = 2)
|
|
{
|
|
if ((end - pos) & 1)
|
|
{
|
|
*out = unhex(*pos);
|
|
++out;
|
|
++pos;
|
|
}
|
|
while (pos < end)
|
|
{
|
|
*out = unhex2(pos);
|
|
pos += word_size;
|
|
++out;
|
|
}
|
|
*out = '\0';
|
|
++out;
|
|
}
|
|
|
|
static void inline binStringDecode(const char * pos, const char * end, char *& out)
|
|
{
|
|
if (pos == end)
|
|
{
|
|
*out = '\0';
|
|
++out;
|
|
return;
|
|
}
|
|
|
|
UInt8 left = 0;
|
|
|
|
/// end - pos is the length of input.
|
|
/// (length & 7) to make remain bits length mod 8 is zero to split.
|
|
/// e.g. the length is 9 and the input is "101000001",
|
|
/// first left_cnt is 1, left is 0, right shift, pos is 1, left = 1
|
|
/// then, left_cnt is 0, remain input is '01000001'.
|
|
for (UInt8 left_cnt = (end - pos) & 7; left_cnt > 0; --left_cnt)
|
|
{
|
|
left = left << 1;
|
|
if (*pos != '0')
|
|
left += 1;
|
|
++pos;
|
|
}
|
|
|
|
if (left != 0 || end - pos == 0)
|
|
{
|
|
*out = left;
|
|
++out;
|
|
}
|
|
|
|
assert((end - pos) % 8 == 0);
|
|
|
|
while (end - pos != 0)
|
|
{
|
|
UInt8 c = 0;
|
|
for (UInt8 i = 0; i < 8; ++i)
|
|
{
|
|
c = c << 1;
|
|
if (*pos != '0')
|
|
c += 1;
|
|
++pos;
|
|
}
|
|
*out = c;
|
|
++out;
|
|
}
|
|
|
|
*out = '\0';
|
|
++out;
|
|
}
|
|
|
|
}
|