Repo created

libs/coding/hex.cpp

@@ -0,0 +1,48 @@
+#include "coding/hex.hpp"
+
+#include "base/assert.hpp"
+
+namespace impl
+{
+static char constexpr kToHexTable[] = "0123456789ABCDEF";
+
+void ToHexRaw(void const * src, size_t size, void * dst)
+{
+  uint8_t const * ptr = static_cast<uint8_t const *>(src);
+  uint8_t const * end = ptr + size;
+  uint8_t * out = static_cast<uint8_t *>(dst);
+
+  while (ptr != end)
+  {
+    *out++ = kToHexTable[(*ptr) >> 4];
+    *out++ = kToHexTable[(*ptr) & 0xF];
+    ++ptr;
+  }
+}
+
+uint8_t HexDigitToRaw(uint8_t const digit)
+{
+  if (digit >= '0' && digit <= '9')
+    return (digit - '0');
+  else if (digit >= 'A' && digit <= 'F')
+    return (digit - 'A' + 10);
+  else if (digit >= 'a' && digit <= 'f')
+    return (digit - 'a' + 10);
+  ASSERT(false, (digit));
+  return 0;
+}
+
+void FromHexRaw(void const * src, size_t size, void * dst)
+{
+  uint8_t const * ptr = static_cast<uint8_t const *>(src);
+  uint8_t const * end = ptr + size;
+  uint8_t * out = static_cast<uint8_t *>(dst);
+
+  while (ptr < end)
+  {
+    *out = HexDigitToRaw(*ptr++) << 4;
+    *out |= HexDigitToRaw(*ptr++);
+    ++out;
+  }
+}
+}  // namespace impl