forked from OSchip/llvm-project
113 lines
2.8 KiB
C++
113 lines
2.8 KiB
C++
//===-- UUID.cpp ----------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Utility/UUID.h"
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#include "lldb/Utility/Stream.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/Format.h"
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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using namespace lldb_private;
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// Whether to put a separator after count uuid bytes.
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// For the first 16 bytes we follow the traditional UUID format. After that, we
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// simply put a dash after every 6 bytes.
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static inline bool separate(size_t count) {
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if (count >= 10)
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return (count - 10) % 6 == 0;
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switch (count) {
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case 4:
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case 6:
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case 8:
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return true;
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default:
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return false;
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}
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}
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std::string UUID::GetAsString(llvm::StringRef separator) const {
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std::string result;
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llvm::raw_string_ostream os(result);
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for (auto B : llvm::enumerate(GetBytes())) {
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if (separate(B.index()))
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os << separator;
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os << llvm::format_hex_no_prefix(B.value(), 2, true);
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}
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os.flush();
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return result;
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}
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void UUID::Dump(Stream *s) const { s->PutCString(GetAsString()); }
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static inline int xdigit_to_int(char ch) {
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ch = tolower(ch);
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if (ch >= 'a' && ch <= 'f')
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return 10 + ch - 'a';
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return ch - '0';
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}
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llvm::StringRef
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UUID::DecodeUUIDBytesFromString(llvm::StringRef p,
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llvm::SmallVectorImpl<uint8_t> &uuid_bytes) {
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uuid_bytes.clear();
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while (p.size() >= 2) {
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if (isxdigit(p[0]) && isxdigit(p[1])) {
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int hi_nibble = xdigit_to_int(p[0]);
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int lo_nibble = xdigit_to_int(p[1]);
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// Translate the two hex nibble characters into a byte
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uuid_bytes.push_back((hi_nibble << 4) + lo_nibble);
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// Skip both hex digits
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p = p.drop_front(2);
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} else if (p.front() == '-') {
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// Skip dashes
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p = p.drop_front();
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} else {
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// UUID values can only consist of hex characters and '-' chars
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break;
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}
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}
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return p;
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}
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bool UUID::SetFromStringRef(llvm::StringRef str) {
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llvm::StringRef p = str;
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// Skip leading whitespace characters
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p = p.ltrim();
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llvm::SmallVector<uint8_t, 20> bytes;
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llvm::StringRef rest = UUID::DecodeUUIDBytesFromString(p, bytes);
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// Return false if we could not consume the entire string or if the parsed
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// UUID is empty.
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if (!rest.empty() || bytes.empty())
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return false;
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*this = fromData(bytes);
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return true;
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}
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bool UUID::SetFromOptionalStringRef(llvm::StringRef str) {
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bool result = SetFromStringRef(str);
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if (result) {
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if (llvm::all_of(m_bytes, [](uint8_t b) { return b == 0; }))
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Clear();
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}
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return result;
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}
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