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Diffstat (limited to 'src/common/linux/guid_creator.cc')
-rw-r--r-- | src/common/linux/guid_creator.cc | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/src/common/linux/guid_creator.cc b/src/common/linux/guid_creator.cc new file mode 100644 index 00000000..d6d4a5bb --- /dev/null +++ b/src/common/linux/guid_creator.cc @@ -0,0 +1,82 @@ +// Copyright (c) 2006, Google Inc. +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +#include <cassert> +#include <cstdio> +#include <cstdlib> +#include <ctime> +#include <unistd.h> + +#include "common/linux/guid_creator.h" + +// +// GUIDGenerator +// +// This class is used to generate random GUID. +// Currently use random number to generate a GUID since Linux has +// no native GUID generator. This should be OK since we don't expect +// crash to happen very offen. +// +class GUIDGenerator { + public: + GUIDGenerator() { + srandom(time(NULL)); + } + + bool CreateGUID(GUID *guid) const { + guid->data1 = random(); + guid->data2 = (u_int16_t)(random()); + guid->data3 = (u_int16_t)(random()); + *reinterpret_cast<u_int32_t*>(&guid->data4[0]) = random(); + *reinterpret_cast<u_int32_t*>(&guid->data4[4]) = random(); + return true; + } +}; + +// Guid generator. +const GUIDGenerator kGuidGenerator; + +bool CreateGUID(GUID *guid) { + return kGuidGenerator.CreateGUID(guid); +}; + +// Parse guid to string. +bool GUIDToString(const GUID *guid, char *buf, int buf_len) { + // Should allow more space the the max length of GUID. + assert(buf_len > kGUIDStringLength); + int num = snprintf(buf, buf_len, kGUIDFormatString, + guid->data1, guid->data2, guid->data3, + *reinterpret_cast<const u_int32_t *>(&(guid->data4[0])), + *reinterpret_cast<const u_int32_t *>(&(guid->data4[4]))); + if (num != kGUIDStringLength) + return false; + + buf[num] = '\0'; + return true; +} |