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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
112 lines
2.9 KiB
C++
112 lines
2.9 KiB
C++
//===-- UUID.cpp ------------------------------------------------*- C++ -*-===//
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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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uint32_t num_uuid_bytes) {
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uuid_bytes.clear();
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while (!p.empty()) {
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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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// Increment the byte that we are decoding within the UUID value and
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// break out if we are done
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if (uuid_bytes.size() == num_uuid_bytes)
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break;
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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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size_t UUID::SetFromStringRef(llvm::StringRef str, uint32_t num_uuid_bytes) {
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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 =
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UUID::DecodeUUIDBytesFromString(p, bytes, num_uuid_bytes);
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// If we successfully decoded a UUID, return the amount of characters that
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// were consumed
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if (bytes.size() == num_uuid_bytes) {
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*this = fromData(bytes);
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return str.size() - rest.size();
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}
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// Else return zero to indicate we were not able to parse a UUID value
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return 0;
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}
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