1 files changed, 123 insertions, 0 deletions
diff --git a/lldb/source/Utility/UUID.cpp b/lldb/source/Utility/UUID.cpp
new file mode 100644
index 0000000000000..2a73f9a482ffd
--- /dev/null
+++ b/lldb/source/Utility/UUID.cpp
@@ -0,0 +1,123 @@
+//===-- UUID.cpp ------------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Utility/UUID.h"
+
+#include "lldb/Utility/Stream.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Format.h"
+
+#include <ctype.h>
+#include <stdio.h>
+#include <string.h>
+
+using namespace lldb_private;
+
+// Whether to put a separator after count uuid bytes.
+// For the first 16 bytes we follow the traditional UUID format. After that, we
+// simply put a dash after every 6 bytes.
+static inline bool separate(size_t count) {
+  if (count >= 10)
+    return (count - 10) % 6 == 0;
+
+  switch (count) {
+  case 4:
+  case 6:
+  case 8:
+    return true;
+  default:
+    return false;
+  }
+}
+
+std::string UUID::GetAsString(llvm::StringRef separator) const {
+  std::string result;
+  llvm::raw_string_ostream os(result);
+
+  for (auto B : llvm::enumerate(GetBytes())) {
+    if (separate(B.index()))
+      os << separator;
+
+    os << llvm::format_hex_no_prefix(B.value(), 2, true);
+  }
+  os.flush();
+
+  return result;
+}
+
+void UUID::Dump(Stream *s) const { s->PutCString(GetAsString()); }
+
+static inline int xdigit_to_int(char ch) {
+  ch = tolower(ch);
+  if (ch >= 'a' && ch <= 'f')
+    return 10 + ch - 'a';
+  return ch - '0';
+}
+
+llvm::StringRef
+UUID::DecodeUUIDBytesFromString(llvm::StringRef p,
+                                llvm::SmallVectorImpl<uint8_t> &uuid_bytes,
+                                uint32_t num_uuid_bytes) {
+  uuid_bytes.clear();
+  while (!p.empty()) {
+    if (isxdigit(p[0]) && isxdigit(p[1])) {
+      int hi_nibble = xdigit_to_int(p[0]);
+      int lo_nibble = xdigit_to_int(p[1]);
+      // Translate the two hex nibble characters into a byte
+      uuid_bytes.push_back((hi_nibble << 4) + lo_nibble);
+
+      // Skip both hex digits
+      p = p.drop_front(2);
+
+      // Increment the byte that we are decoding within the UUID value and
+      // break out if we are done
+      if (uuid_bytes.size() == num_uuid_bytes)
+        break;
+    } else if (p.front() == '-') {
+      // Skip dashes
+      p = p.drop_front();
+    } else {
+      // UUID values can only consist of hex characters and '-' chars
+      break;
+    }
+  }
+  return p;
+}
+
+size_t UUID::SetFromStringRef(llvm::StringRef str, uint32_t num_uuid_bytes) {
+  llvm::StringRef p = str;
+
+  // Skip leading whitespace characters
+  p = p.ltrim();
+
+  llvm::SmallVector<uint8_t, 20> bytes;
+  llvm::StringRef rest =
+      UUID::DecodeUUIDBytesFromString(p, bytes, num_uuid_bytes);
+
+  // If we successfully decoded a UUID, return the amount of characters that
+  // were consumed
+  if (bytes.size() == num_uuid_bytes) {
+    *this = fromData(bytes);
+    return str.size() - rest.size();
+  }
+
+  // Else return zero to indicate we were not able to parse a UUID value
+  return 0;
+}
+
+size_t UUID::SetFromOptionalStringRef(llvm::StringRef str, 
+                                      uint32_t num_uuid_bytes) {
+  size_t num_chars_consumed = SetFromStringRef(str, num_uuid_bytes);
+  if (num_chars_consumed) {
+    if (llvm::all_of(m_bytes, [](uint8_t b) { return b == 0; }))
+        Clear();
+  }
+  
+  return num_chars_consumed;
+}
+