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1 //===-- UUID.cpp ------------------------------------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "lldb/Core/UUID.h"
11 // C Includes
12 #include <string.h>
13 #include <stdio.h>
14 #include <ctype.h>
15
16 // C++ Includes
17 #include <string>
18
19 // Other libraries and framework includes
20 // Project includes
21 #include "lldb/Core/Stream.h"
22
23 namespace lldb_private {
24
25 UUID::UUID() : m_num_uuid_bytes(16)
26 {
27     ::memset (m_uuid, 0, sizeof(m_uuid));
28 }
29
30 UUID::UUID(const UUID& rhs)
31 {
32     m_num_uuid_bytes = rhs.m_num_uuid_bytes;
33     ::memcpy (m_uuid, rhs.m_uuid, sizeof (m_uuid));
34 }
35
36 UUID::UUID (const void *uuid_bytes, uint32_t num_uuid_bytes)
37 {
38     SetBytes (uuid_bytes, num_uuid_bytes);
39 }
40
41 const UUID&
42 UUID::operator=(const UUID& rhs)
43 {
44     if (this != &rhs)
45     {
46         m_num_uuid_bytes = rhs.m_num_uuid_bytes;
47         ::memcpy (m_uuid, rhs.m_uuid, sizeof (m_uuid));
48     }
49     return *this;
50 }
51
52 UUID::~UUID()
53 {
54 }
55
56 void
57 UUID::Clear()
58 {
59     m_num_uuid_bytes = 16;
60     ::memset (m_uuid, 0, sizeof(m_uuid));
61 }
62
63 const void *
64 UUID::GetBytes() const
65 {
66     return m_uuid;
67 }
68
69 std::string
70 UUID::GetAsString (const char *separator) const
71 {
72     std::string result;
73     char buf[256];
74     if (!separator)
75         separator = "-";
76     const uint8_t *u = (const uint8_t *)GetBytes();
77     if (sizeof (buf) > (size_t)snprintf (buf,
78                             sizeof (buf),
79                             "%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",
80                             u[0],u[1],u[2],u[3],separator,
81                             u[4],u[5],separator,
82                             u[6],u[7],separator,
83                             u[8],u[9],separator,
84                             u[10],u[11],u[12],u[13],u[14],u[15]))
85     {
86         result.append (buf);
87         if (m_num_uuid_bytes == 20)
88         {
89             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]))
90                 result.append (buf);
91         }
92     }
93     return result;
94 }
95
96 void
97 UUID::Dump (Stream *s) const
98 {
99     const uint8_t *u = (const uint8_t *)GetBytes();
100     s->Printf ("%2.2X%2.2X%2.2X%2.2X-%2.2X%2.2X-%2.2X%2.2X-%2.2X%2.2X-%2.2X%2.2X%2.2X%2.2X%2.2X%2.2X",
101               u[0],u[1],u[2],u[3],u[4],u[5],u[6],u[7],u[8],u[9],u[10],u[11],u[12],u[13],u[14],u[15]);
102     if (m_num_uuid_bytes == 20)
103     {
104         s->Printf ("-%2.2X%2.2X%2.2X%2.2X", u[16],u[17],u[18],u[19]);
105     }
106 }
107
108 bool
109 UUID::SetBytes (const void *uuid_bytes, uint32_t num_uuid_bytes)
110 {
111     if (uuid_bytes)
112     {
113         switch (num_uuid_bytes)
114         {
115             case 20:
116                 m_num_uuid_bytes = 20;
117                 break;
118             case 16:
119                 m_num_uuid_bytes = 16;
120                 m_uuid[16] = m_uuid[17] = m_uuid[18] = m_uuid[19] = 0;
121                 break;
122             default:
123                 // Unsupported UUID byte size
124                 m_num_uuid_bytes = 0;
125                 break;
126         }
127
128         if (m_num_uuid_bytes > 0)
129         {
130             ::memcpy (m_uuid, uuid_bytes, m_num_uuid_bytes);
131             return true;
132         }
133     }
134     ::memset (m_uuid, 0, sizeof(m_uuid));
135     return false;
136 }
137
138 size_t
139 UUID::GetByteSize()
140 {
141     return m_num_uuid_bytes;
142 }
143
144 bool
145 UUID::IsValid () const
146 {
147     return  m_uuid[0]  ||
148             m_uuid[1]  ||
149             m_uuid[2]  ||
150             m_uuid[3]  ||
151             m_uuid[4]  ||
152             m_uuid[5]  ||
153             m_uuid[6]  ||
154             m_uuid[7]  ||
155             m_uuid[8]  ||
156             m_uuid[9]  ||
157             m_uuid[10] ||
158             m_uuid[11] ||
159             m_uuid[12] ||
160             m_uuid[13] ||
161             m_uuid[14] ||
162             m_uuid[15] ||
163             m_uuid[16] ||
164             m_uuid[17] ||
165             m_uuid[18] ||
166             m_uuid[19];
167 }
168
169 static inline int
170 xdigit_to_int (char ch)
171 {
172     ch = tolower(ch);
173     if (ch >= 'a' && ch <= 'f')
174         return 10 + ch - 'a';
175     return ch - '0';
176 }
177
178 size_t
179 UUID::DecodeUUIDBytesFromCString (const char *p, ValueType &uuid_bytes, const char **end, uint32_t num_uuid_bytes)
180 {
181     size_t uuid_byte_idx = 0;
182     if (p)
183     {
184         while (*p)
185         {
186             if (isxdigit(p[0]) && isxdigit(p[1]))
187             {
188                 int hi_nibble = xdigit_to_int(p[0]);
189                 int lo_nibble = xdigit_to_int(p[1]);
190                 // Translate the two hex nibble characters into a byte
191                 uuid_bytes[uuid_byte_idx] = (hi_nibble << 4) + lo_nibble;
192                 
193                 // Skip both hex digits
194                 p += 2;
195                 
196                 // Increment the byte that we are decoding within the UUID value
197                 // and break out if we are done
198                 if (++uuid_byte_idx == num_uuid_bytes)
199                     break;
200             }
201             else if (*p == '-')
202             {
203                 // Skip dashes
204                 p++;
205             }
206             else
207             {
208                 // UUID values can only consist of hex characters and '-' chars
209                 break;
210             }
211         }
212     }
213     if (end)
214         *end = p;
215     // Clear trailing bytes to 0.
216     for (uint32_t i = uuid_byte_idx; i < sizeof(ValueType); i++)
217         uuid_bytes[i] = 0;
218     return uuid_byte_idx;
219 }
220 size_t
221 UUID::SetFromCString (const char *cstr, uint32_t num_uuid_bytes)
222 {
223     if (cstr == NULL)
224         return 0;
225
226     const char *p = cstr;
227
228     // Skip leading whitespace characters
229     while (isspace(*p))
230         ++p;
231     
232     const size_t uuid_byte_idx = UUID::DecodeUUIDBytesFromCString (p, m_uuid, &p, num_uuid_bytes);
233
234     // If we successfully decoded a UUID, return the amount of characters that
235     // were consumed
236     if (uuid_byte_idx == num_uuid_bytes)
237         return p - cstr;
238
239     // Else return zero to indicate we were not able to parse a UUID value
240     return 0;
241 }
242
243 }
244
245 bool
246 lldb_private::operator == (const lldb_private::UUID &lhs, const lldb_private::UUID &rhs)
247 {
248     return ::memcmp (lhs.GetBytes(), rhs.GetBytes(), sizeof (lldb_private::UUID::ValueType)) == 0;
249 }
250
251 bool
252 lldb_private::operator != (const lldb_private::UUID &lhs, const lldb_private::UUID &rhs)
253 {
254     return ::memcmp (lhs.GetBytes(), rhs.GetBytes(), sizeof (lldb_private::UUID::ValueType)) != 0;
255 }
256
257 bool
258 lldb_private::operator <  (const lldb_private::UUID &lhs, const lldb_private::UUID &rhs)
259 {
260     return ::memcmp (lhs.GetBytes(), rhs.GetBytes(), sizeof (lldb_private::UUID::ValueType)) <  0;
261 }
262
263 bool
264 lldb_private::operator <= (const lldb_private::UUID &lhs, const lldb_private::UUID &rhs)
265 {
266     return ::memcmp (lhs.GetBytes(), rhs.GetBytes(), sizeof (lldb_private::UUID::ValueType)) <= 0;
267 }
268
269 bool
270 lldb_private::operator >  (const lldb_private::UUID &lhs, const lldb_private::UUID &rhs)
271 {
272     return ::memcmp (lhs.GetBytes(), rhs.GetBytes(), sizeof (lldb_private::UUID::ValueType)) >  0;
273 }
274
275 bool
276 lldb_private::operator >= (const lldb_private::UUID &lhs, const lldb_private::UUID &rhs)
277 {
278     return ::memcmp (lhs.GetBytes(), rhs.GetBytes(), sizeof (lldb_private::UUID::ValueType)) >= 0;
279 }