Function computeMD5Hash

src/Common/LLVMCoverageMapping.cpp:27–34

Compute MD5Hash the same way LLVM does: MD5 digest, return first 8 bytes as little-endian uint64. This matches IndexedInstrProf::ComputeHash() which is used to compute FilenamesRef.

/// Compute MD5Hash the same way LLVM does: MD5 digest, return first 8 bytes as little-endian uint64.
/// This matches IndexedInstrProf::ComputeHash() which is used to compute FilenamesRef.
uint64_t computeMD5Hash(const uint8_t * data, size_t len)
{
    unsigned char digest[MD5_DIGEST_LENGTH]; // NOLINT
    MD5(data, len, digest); // NOLINT
    uint64_t result;
    memcpy(&result, digest, 8);
    return result;
}

/// Read an unsigned LEB128 value from buf, advance buf, return value.
/// Sets ok = false and returns 0 on truncated input or overflow.