diff options
Diffstat (limited to 'webrtc/base/helpers.cc')
-rw-r--r-- | webrtc/base/helpers.cc | 57 |
1 files changed, 48 insertions, 9 deletions
diff --git a/webrtc/base/helpers.cc b/webrtc/base/helpers.cc index 8e59b6410c..1ad5d0e12b 100644 --- a/webrtc/base/helpers.cc +++ b/webrtc/base/helpers.cc @@ -164,16 +164,20 @@ class TestRandomGenerator : public RandomGenerator { int seed_; }; +namespace { + // TODO: Use Base64::Base64Table instead. -static const char BASE64[64] = { - 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', - 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', - 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', - 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', - '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' -}; +static const char kBase64[64] = { + 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', + 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', + 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', + 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', + '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'}; -namespace { +static const char kHex[16] = {'0', '1', '2', '3', '4', '5', '6', '7', + '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}; + +static const char kUuidDigit17[4] = {'8', '9', 'a', 'b'}; // This round about way of creating a global RNG is to safe-guard against // indeterminant static initialization order. @@ -232,7 +236,7 @@ bool CreateRandomString(size_t len, } bool CreateRandomString(size_t len, std::string* str) { - return CreateRandomString(len, BASE64, 64, str); + return CreateRandomString(len, kBase64, 64, str); } bool CreateRandomString(size_t len, const std::string& table, @@ -241,6 +245,41 @@ bool CreateRandomString(size_t len, const std::string& table, static_cast<int>(table.size()), str); } +// Version 4 UUID is of the form: +// xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx +// Where 'x' is a hex digit, and 'y' is 8, 9, a or b. +std::string CreateRandomUuid() { + std::string str; + scoped_ptr<uint8_t[]> bytes(new uint8_t[31]); + if (!Rng().Generate(bytes.get(), 31)) { + LOG(LS_ERROR) << "Failed to generate random string!"; + return str; + } + str.reserve(36); + for (size_t i = 0; i < 8; ++i) { + str.push_back(kHex[bytes[i] % 16]); + } + str.push_back('-'); + for (size_t i = 8; i < 12; ++i) { + str.push_back(kHex[bytes[i] % 16]); + } + str.push_back('-'); + str.push_back('4'); + for (size_t i = 12; i < 15; ++i) { + str.push_back(kHex[bytes[i] % 16]); + } + str.push_back('-'); + str.push_back(kUuidDigit17[bytes[15] % 4]); + for (size_t i = 16; i < 19; ++i) { + str.push_back(kHex[bytes[i] % 16]); + } + str.push_back('-'); + for (size_t i = 19; i < 31; ++i) { + str.push_back(kHex[bytes[i] % 16]); + } + return str; +} + uint32_t CreateRandomId() { uint32_t id; if (!Rng().Generate(&id, sizeof(id))) { |