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#include "guid.h"
#include "ylimits.h"
#include "string.h"
#include <util/string/ascii.h>
#include <util/string/builder.h>
#include <util/stream/format.h>
#include <util/system/unaligned_mem.h>
#include <util/random/easy.h>
namespace {
inline void LowerCaseHex(TString& s) {
for (auto&& c : s) {
c = AsciiToLower(c);
}
}
}
TString TGUID::AsGuidString() const {
TStringBuilder s;
s.reserve(50);
s << Hex(dw[0], 0) << '-' << Hex(dw[1], 0) << '-' << Hex(dw[2], 0) << '-' << Hex(dw[3], 0);
LowerCaseHex(s);
return std::move(s);
}
TString TGUID::AsUuidString() const {
TStringBuilder s;
s.reserve(50);
s << Hex(dw[0], HF_FULL) << '-';
s << Hex(static_cast<ui16>(dw[1] >> 16), HF_FULL) << '-' << Hex(static_cast<ui16>(dw[1]), HF_FULL) << '-';
s << Hex(static_cast<ui16>(dw[2] >> 16), HF_FULL) << '-' << Hex(static_cast<ui16>(dw[2]), HF_FULL);
s << Hex(dw[3], HF_FULL);
LowerCaseHex(s);
return std::move(s);
}
TGUID TGUID::Create() {
TGUID result;
CreateGuid(&result);
return result;
}
void CreateGuid(TGUID* res) {
ui64* dw = reinterpret_cast<ui64*>(res->dw);
WriteUnaligned<ui64>(&dw[0], RandomNumber<ui64>());
WriteUnaligned<ui64>(&dw[1], RandomNumber<ui64>());
}
TGUID TGUID::CreateTimebased() {
TGUID result;
// GUID_EPOCH_OFFSET is the number of 100-ns intervals between the
// UUID epoch 1582-10-15 00:00:00 and the Unix epoch 1970-01-01 00:00:00.
constexpr ui64 GUID_EPOCH_OFFSET = 0x01b21dd213814000;
const ui64 timestamp = Now().NanoSeconds() / 100 + GUID_EPOCH_OFFSET;
result.dw[0] = ui32(timestamp & 0xffffffff); // time low
const ui32 timeMid = ui32((timestamp >> 32) & 0xffff);
constexpr ui32 UUID_VERSION = 1;
const ui32 timeHighAndVersion = ui16((timestamp >> 48) & 0x0fff) | (UUID_VERSION << 12);
result.dw[1] = (timeMid << 16) | timeHighAndVersion;
const ui32 clockSeq = RandomNumber<ui32>(0x3fff) | 0x8000;
result.dw[2] = (clockSeq << 16) | RandomNumber<ui16>();
result.dw[3] = RandomNumber<ui32>() | (1 << 24);
return result;
}
TString GetGuidAsString(const TGUID& g) {
return g.AsGuidString();
}
TString CreateGuidAsString() {
return TGUID::Create().AsGuidString();
}
static bool GetDigit(const char c, ui32& digit) {
digit = 0;
if ('0' <= c && c <= '9') {
digit = c - '0';
} else if ('a' <= c && c <= 'f') {
digit = c - 'a' + 10;
} else if ('A' <= c && c <= 'F') {
digit = c - 'A' + 10;
} else {
return false; // non-hex character
}
return true;
}
bool GetGuid(const TStringBuf s, TGUID& result) {
size_t partId = 0;
ui64 partValue = 0;
bool isEmptyPart = true;
for (size_t i = 0; i != s.size(); ++i) {
const char c = s[i];
if (c == '-') {
if (isEmptyPart || partId == 3) { // x-y--z, -x-y-z or x-y-z-m-...
return false;
}
result.dw[partId] = static_cast<ui32>(partValue);
++partId;
partValue = 0;
isEmptyPart = true;
continue;
}
ui32 digit = 0;
if (!GetDigit(c, digit)) {
return false;
}
partValue = partValue * 16 + digit;
isEmptyPart = false;
// overflow check
if (partValue > Max<ui32>()) {
return false;
}
}
if (partId != 3 || isEmptyPart) { // x-y or x-y-z-
return false;
}
result.dw[partId] = static_cast<ui32>(partValue);
return true;
}
// Parses GUID from s and checks that it's valid.
// In case of error returns TGUID().
TGUID GetGuid(const TStringBuf s) {
TGUID result;
if (GetGuid(s, result)) {
return result;
}
return TGUID();
}
bool GetUuid(const TStringBuf s, TGUID& result) {
if (s.size() != 36) {
return false;
}
size_t partId = 0;
ui64 partValue = 0;
size_t digitCount = 0;
for (size_t i = 0; i < s.size(); ++i) {
const char c = s[i];
if (c == '-') {
if (i != 8 && i != 13 && i != 18 && i != 23) {
return false;
}
continue;
}
ui32 digit = 0;
if (!GetDigit(c, digit)) {
return false;
}
partValue = partValue * 16 + digit;
if (++digitCount == 8) {
result.dw[partId++] = partValue;
digitCount = 0;
}
}
return true;
}
// Parses GUID from uuid and checks that it's valid.
// In case of error returns TGUID().
TGUID GetUuid(const TStringBuf s) {
TGUID result;
if (GetUuid(s, result)) {
return result;
}
return TGUID();
}
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