llvm-project/lldb/source/Utility/UUID.cpp

216 lines
6.2 KiB
C++

//===-- UUID.cpp ------------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/Utility/UUID.h"
// Other libraries and framework includes
// Project includes
#include "lldb/Utility/Stream.h"
#include "llvm/ADT/StringRef.h"
// C Includes
#include <ctype.h>
#include <stdio.h>
#include <string.h>
namespace lldb_private {
UUID::UUID() { Clear(); }
UUID::UUID(const UUID &rhs) {
SetBytes(rhs.m_uuid, rhs.m_num_uuid_bytes);
}
UUID::UUID(const void *uuid_bytes, uint32_t num_uuid_bytes) {
SetBytes(uuid_bytes, num_uuid_bytes);
}
const UUID &UUID::operator=(const UUID &rhs) {
if (this != &rhs) {
m_num_uuid_bytes = rhs.m_num_uuid_bytes;
::memcpy(m_uuid, rhs.m_uuid, sizeof(m_uuid));
}
return *this;
}
UUID::~UUID() {}
void UUID::Clear() {
m_num_uuid_bytes = 16;
::memset(m_uuid, 0, sizeof(m_uuid));
}
const void *UUID::GetBytes() const { return m_uuid; }
std::string UUID::GetAsString(const char *separator) const {
std::string result;
char buf[256];
if (!separator)
separator = "-";
const uint8_t *u = (const uint8_t *)GetBytes();
if (sizeof(buf) >
(size_t)snprintf(buf, sizeof(buf), "%2.2X%2.2X%2.2X%2.2X%s%2.2X%2.2X%s%2."
"2X%2.2X%s%2.2X%2.2X%s%2.2X%2.2X%2.2X%"
"2.2X%2.2X%2.2X",
u[0], u[1], u[2], u[3], separator, u[4], u[5], separator,
u[6], u[7], separator, u[8], u[9], separator, u[10],
u[11], u[12], u[13], u[14], u[15])) {
result.append(buf);
if (m_num_uuid_bytes == 20) {
if (sizeof(buf) > (size_t)snprintf(buf, sizeof(buf),
"%s%2.2X%2.2X%2.2X%2.2X", separator,
u[16], u[17], u[18], u[19]))
result.append(buf);
}
}
return result;
}
void UUID::Dump(Stream *s) const {
s->PutCString(GetAsString().c_str());
}
bool UUID::SetBytes(const void *uuid_bytes, uint32_t num_uuid_bytes) {
if (uuid_bytes) {
switch (num_uuid_bytes) {
case 20:
m_num_uuid_bytes = 20;
break;
case 16:
m_num_uuid_bytes = 16;
m_uuid[16] = m_uuid[17] = m_uuid[18] = m_uuid[19] = 0;
break;
default:
// Unsupported UUID byte size
m_num_uuid_bytes = 0;
break;
}
if (m_num_uuid_bytes > 0) {
::memcpy(m_uuid, uuid_bytes, m_num_uuid_bytes);
return true;
}
}
::memset(m_uuid, 0, sizeof(m_uuid));
return false;
}
size_t UUID::GetByteSize() const { return m_num_uuid_bytes; }
bool UUID::IsValid() const {
return m_uuid[0] || m_uuid[1] || m_uuid[2] || m_uuid[3] || m_uuid[4] ||
m_uuid[5] || m_uuid[6] || m_uuid[7] || m_uuid[8] || m_uuid[9] ||
m_uuid[10] || m_uuid[11] || m_uuid[12] || m_uuid[13] || m_uuid[14] ||
m_uuid[15] || m_uuid[16] || m_uuid[17] || m_uuid[18] || m_uuid[19];
}
static inline int xdigit_to_int(char ch) {
ch = tolower(ch);
if (ch >= 'a' && ch <= 'f')
return 10 + ch - 'a';
return ch - '0';
}
llvm::StringRef UUID::DecodeUUIDBytesFromString(llvm::StringRef p,
ValueType &uuid_bytes,
uint32_t &bytes_decoded,
uint32_t num_uuid_bytes) {
::memset(uuid_bytes, 0, sizeof(uuid_bytes));
size_t uuid_byte_idx = 0;
while (!p.empty()) {
if (isxdigit(p[0]) && isxdigit(p[1])) {
int hi_nibble = xdigit_to_int(p[0]);
int lo_nibble = xdigit_to_int(p[1]);
// Translate the two hex nibble characters into a byte
uuid_bytes[uuid_byte_idx] = (hi_nibble << 4) + lo_nibble;
// Skip both hex digits
p = p.drop_front(2);
// Increment the byte that we are decoding within the UUID value
// and break out if we are done
if (++uuid_byte_idx == num_uuid_bytes)
break;
} else if (p.front() == '-') {
// Skip dashes
p = p.drop_front();
} else {
// UUID values can only consist of hex characters and '-' chars
break;
}
}
// Clear trailing bytes to 0.
for (uint32_t i = uuid_byte_idx; i < sizeof(ValueType); i++)
uuid_bytes[i] = 0;
bytes_decoded = uuid_byte_idx;
return p;
}
size_t UUID::SetFromStringRef(llvm::StringRef str, uint32_t num_uuid_bytes) {
llvm::StringRef p = str;
// Skip leading whitespace characters
p = p.ltrim();
uint32_t bytes_decoded = 0;
llvm::StringRef rest =
UUID::DecodeUUIDBytesFromString(p, m_uuid, bytes_decoded, num_uuid_bytes);
// If we successfully decoded a UUID, return the amount of characters that
// were consumed
if (bytes_decoded == num_uuid_bytes) {
m_num_uuid_bytes = num_uuid_bytes;
return str.size() - rest.size();
}
// Else return zero to indicate we were not able to parse a UUID value
return 0;
}
size_t UUID::SetFromCString(const char *cstr, uint32_t num_uuid_bytes) {
if (cstr == NULL)
return 0;
return SetFromStringRef(cstr, num_uuid_bytes);
}
}
bool lldb_private::operator==(const lldb_private::UUID &lhs,
const lldb_private::UUID &rhs) {
return ::memcmp(lhs.GetBytes(), rhs.GetBytes(),
sizeof(lldb_private::UUID::ValueType)) == 0;
}
bool lldb_private::operator!=(const lldb_private::UUID &lhs,
const lldb_private::UUID &rhs) {
return !(lhs == rhs);
}
bool lldb_private::operator<(const lldb_private::UUID &lhs,
const lldb_private::UUID &rhs) {
return ::memcmp(lhs.GetBytes(), rhs.GetBytes(),
sizeof(lldb_private::UUID::ValueType)) < 0;
}
bool lldb_private::operator<=(const lldb_private::UUID &lhs,
const lldb_private::UUID &rhs) {
return !(lhs > rhs);
}
bool lldb_private::operator>(const lldb_private::UUID &lhs,
const lldb_private::UUID &rhs) {
return rhs < lhs;
}
bool lldb_private::operator>=(const lldb_private::UUID &lhs,
const lldb_private::UUID &rhs) {
return !(lhs < rhs);
}