diff options
Diffstat (limited to 'toolkit/crashreporter/breakpad-client/linux/handler/guid_generator.cc')
-rw-r--r-- | toolkit/crashreporter/breakpad-client/linux/handler/guid_generator.cc | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/toolkit/crashreporter/breakpad-client/linux/handler/guid_generator.cc b/toolkit/crashreporter/breakpad-client/linux/handler/guid_generator.cc new file mode 100644 index 0000000000..b0ef05bd9d --- /dev/null +++ b/toolkit/crashreporter/breakpad-client/linux/handler/guid_generator.cc @@ -0,0 +1,108 @@ +// 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 "linux/handler/guid_generator.h" + +#include <assert.h> +#include <pthread.h> +#include <stdio.h> +#include <stdlib.h> +#include <time.h> +#include <unistd.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: + static uint16_t BytesToUInt16(const uint8_t bytes[]) { + return ((uint16_t) bytes[1] << 8) | ((uint16_t) bytes[0]); + } + + // The last field in a GUID is 48 bits long so we're converting only 6 bytes + static uint64_t BytesToUInt48(const uint8_t bytes[]) { + return ((uint64_t) bytes[0] << 40) | ((uint64_t) bytes[1] << 32) | + ((uint64_t) bytes[2] << 24) | ((uint64_t) bytes[3] << 16) | + ((uint64_t) bytes[4] << 8) | (uint64_t) bytes[5]; + } + + static void UInt32ToBytes(uint8_t bytes[], uint32_t n) { + bytes[0] = n & 0xff; + bytes[1] = (n >> 8) & 0xff; + bytes[2] = (n >> 16) & 0xff; + bytes[3] = (n >> 24) & 0xff; + } + + static bool CreateGUID(GUID *guid) { + InitOnce(); + guid->data1 = random(); + guid->data2 = (uint16_t)(random()); + guid->data3 = (uint16_t)(random()); + UInt32ToBytes(&guid->data4[0], random()); + UInt32ToBytes(&guid->data4[4], random()); + return true; + } + + private: + static void InitOnce() { + pthread_once(&once_control, &InitOnceImpl); + } + + static void InitOnceImpl() { + srandom(time(NULL)); + } + + static pthread_once_t once_control; +}; + +pthread_once_t GUIDGenerator::once_control = PTHREAD_ONCE_INIT; + +bool CreateGUID(GUID *guid) { + return GUIDGenerator::CreateGUID(guid); +} + +// Parse guid to string. +bool GUIDToString(const GUID *guid, char *buf, size_t 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, + GUIDGenerator::BytesToUInt16(&(guid->data4[0])), + GUIDGenerator::BytesToUInt48(&(guid->data4[2]))); + if (num != kGUIDStringLength) + return false; + + buf[num] = '\0'; + return true; +} |