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hexview/include/hex.hpp

44 lines
1.1 KiB

4 years ago
#pragma once
#include "span.hpp"
namespace hv {
/// Print a single screen
void print_screen(const span<unsigned char> bytes, unsigned long offset);
4 years ago
inline void lookup_hex_string(std::uint64_t x, char* s)
{
static const char digits[513] =
"000102030405060708090a0b0c0d0e0f"
"101112131415161718191a1b1c1d1e1f"
"202122232425262728292a2b2c2d2e2f"
"303132333435363738393a3b3c3d3e3f"
"404142434445464748494a4b4c4d4e4f"
"505152535455565758595a5b5c5d5e5f"
"606162636465666768696a6b6c6d6e6f"
"707172737475767778797a7b7c7d7e7f"
"808182838485868788898a8b8c8d8e8f"
"909192939495969798999a9b9c9d9e9f"
"a0a1a2a3a4a5a6a7a8a9aaabacadaeaf"
"b0b1b2b3b4b5b6b7b8b9babbbcbdbebf"
"c0c1c2c3c4c5c6c7c8c9cacbcccdcecf"
"d0d1d2d3d4d5d6d7d8d9dadbdcdddedf"
"e0e1e2e3e4e5e6e7e8e9eaebecedeeef"
"f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff";
int i = 7;
const char *lut = (const char *)digits;
while (i >= 0)
{
int pos = (x & 0xFF) * 2;
char ch = lut[pos];
s[i * 2] = ch;
ch = lut[pos + 1];
s[i * 2 + 1] = ch;
x >>= 8;
i -= 1;
}
}
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}