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Diffstat (limited to 'third_party/chromium/base/guid.cc')
-rw-r--r-- | third_party/chromium/base/guid.cc | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/third_party/chromium/base/guid.cc b/third_party/chromium/base/guid.cc new file mode 100644 index 0000000..bb41e8c --- /dev/null +++ b/third_party/chromium/base/guid.cc @@ -0,0 +1,79 @@ +// Copyright (c) 2012 The Chromium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +#include "base/guid.h" + +#include <stddef.h> +#include <stdint.h> + +#include "base/rand_util.h" +#include "base/strings/string_util.h" +#include "base/strings/stringprintf.h" + +namespace base { + +namespace { + +bool IsLowerHexDigit(char c) { + return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f'); +} + +bool IsValidGUIDInternal(const base::StringPiece& guid, bool strict) { + const size_t kGUIDLength = 36U; + if (guid.length() != kGUIDLength) + return false; + + for (size_t i = 0; i < guid.length(); ++i) { + char current = guid[i]; + if (i == 8 || i == 13 || i == 18 || i == 23) { + if (current != '-') + return false; + } else { + if ((strict && !IsLowerHexDigit(current)) || !IsHexDigit(current)) + return false; + } + } + + return true; +} + +} // namespace + +std::string GenerateGUID() { + uint64_t sixteen_bytes[2] = {base::RandUint64(), base::RandUint64()}; + + // Set the GUID to version 4 as described in RFC 4122, section 4.4. + // The format of GUID version 4 must be xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, + // where y is one of [8, 9, A, B]. + + // Clear the version bits and set the version to 4: + sixteen_bytes[0] &= 0xffffffffffff0fffULL; + sixteen_bytes[0] |= 0x0000000000004000ULL; + + // Set the two most significant bits (bits 6 and 7) of the + // clock_seq_hi_and_reserved to zero and one, respectively: + sixteen_bytes[1] &= 0x3fffffffffffffffULL; + sixteen_bytes[1] |= 0x8000000000000000ULL; + + return RandomDataToGUIDString(sixteen_bytes); +} + +bool IsValidGUID(const base::StringPiece& guid) { + return IsValidGUIDInternal(guid, false /* strict */); +} + +bool IsValidGUIDOutputString(const base::StringPiece& guid) { + return IsValidGUIDInternal(guid, true /* strict */); +} + +std::string RandomDataToGUIDString(const uint64_t bytes[2]) { + return StringPrintf("%08X-%04X-%04X-%04X-%012llX", + static_cast<unsigned int>(bytes[0] >> 32), + static_cast<unsigned int>((bytes[0] >> 16) & 0x0000ffff), + static_cast<unsigned int>(bytes[0] & 0x0000ffff), + static_cast<unsigned int>(bytes[1] >> 48), + bytes[1] & 0x0000ffffffffffffULL); +} + +} // namespace base |