ClickHouse/dbms/src/Functions/protocol.h

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#pragma once
#include <Functions/FunctionsURL.h>
#include <Common/StringUtils/StringUtils.h>
namespace DB
{
/// Extracts scheme from given url.
inline StringRef getURLScheme(const char * data, size_t size)
{
// scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
const char * pos = data;
const char * end = data + size;
if (isAlphaASCII(*pos))
{
for (++pos; pos < end; ++pos)
{
if (!(isAlphaNumericASCII(*pos) || *pos == '+' || *pos == '-' || *pos == '.'))
{
break;
}
}
return StringRef(data, pos - data);
}
return {};
}
struct ExtractProtocol
{
static size_t getReserveLengthForElement()
{
return strlen("https") + 1;
}
static void execute(Pos data, size_t size, Pos & res_data, size_t & res_size)
{
res_data = data;
res_size = 0;
StringRef scheme = getURLScheme(data, size);
Pos pos = data + scheme.size;
if (scheme.size == 0 || (data + size) - pos < 4)
return;
if (pos[0] == ':')
res_size = pos - data;
}
};
}