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#pragma once
#include <string>
#include <stdexcept>
namespace odhtdb
{
class InvalidHexStringFormat : public std::runtime_error
{
public:
InvalidHexStringFormat(const std::string &errMsg) : std::runtime_error(errMsg) {}
};
// Returns -1 if c is not a hex string (0-9a-fA-F)
static int __hexchar_to_num(int c)
{
if(c >= '0' && c <= '9')
return c - '0';
else if(c >= 'a' && c <= 'f')
return 10 + (c - 'a');
else if(c >= 'A' && c <= 'F')
return 10 + (c - 'A');
else
return -1;
}
// Throws InvalidHexStringFormat on invalid input
static std::string hex2bin(const char *data, size_t dataSize)
{
if(dataSize % 2 != 0)
throw InvalidHexStringFormat("Input string size is not of an even size");
std::string result;
result.resize(dataSize / 2);
for(int i = 0; i < dataSize; i += 2)
{
int v = __hexchar_to_num(data[i]);
int v2 = __hexchar_to_num(data[i + 1]);
if(v == -1)
{
std::string errMsg = "Invalid hex character: ";
errMsg += data[i];
throw InvalidHexStringFormat(errMsg);
}
if(v2 == -1)
{
std::string errMsg = "Invalid hex character: ";
errMsg += data[i + 1];
throw InvalidHexStringFormat(errMsg);
}
result[i / 2] = (v << 4) | v2;
}
return result;
}
}
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