1 //===- PackedVersion.cpp --------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // Implements the Mach-O packed version.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "llvm/TextAPI/PackedVersion.h"
14 #include "llvm/ADT/SmallVector.h"
15 #include "llvm/ADT/StringExtras.h"
16 #include "llvm/Support/Format.h"
17 #include "llvm/Support/raw_ostream.h"
18 
19 namespace llvm {
20 namespace MachO {
21 
22 bool PackedVersion::parse32(StringRef Str) {
23   Version = 0;
24 
25   if (Str.empty())
26     return false;
27 
28   SmallVector<StringRef, 3> Parts;
29   SplitString(Str, Parts, ".");
30 
31   if (Parts.size() > 3)
32     return false;
33 
34   unsigned long long Num;
35   if (getAsUnsignedInteger(Parts[0], 10, Num))
36     return false;
37 
38   if (Num > UINT16_MAX)
39     return false;
40 
41   Version = Num << 16;
42 
43   for (unsigned i = 1, ShiftNum = 8; i < Parts.size(); ++i, ShiftNum -= 8) {
44     if (getAsUnsignedInteger(Parts[i], 10, Num))
45       return false;
46 
47     if (Num > UINT8_MAX)
48       return false;
49 
50     Version |= (Num << ShiftNum);
51   }
52 
53   return true;
54 }
55 
56 std::pair<bool, bool> PackedVersion::parse64(StringRef Str) {
57   bool Truncated = false;
58   Version = 0;
59 
60   if (Str.empty())
61     return std::make_pair(false, Truncated);
62 
63   SmallVector<StringRef, 5> Parts;
64   SplitString(Str, Parts, ".");
65 
66   if (Parts.size() > 5)
67     return std::make_pair(false, Truncated);
68 
69   unsigned long long Num;
70   if (getAsUnsignedInteger(Parts[0], 10, Num))
71     return std::make_pair(false, Truncated);
72 
73   if (Num > 0xFFFFFFULL)
74     return std::make_pair(false, Truncated);
75 
76   if (Num > 0xFFFFULL) {
77     Num = 0xFFFFULL;
78     Truncated = true;
79   }
80   Version = Num << 16;
81 
82   for (unsigned i = 1, ShiftNum = 8; i < Parts.size() && i < 3;
83        ++i, ShiftNum -= 8) {
84     if (getAsUnsignedInteger(Parts[i], 10, Num))
85       return std::make_pair(false, Truncated);
86 
87     if (Num > 0x3FFULL)
88       return std::make_pair(false, Truncated);
89 
90     if (Num > 0xFFULL) {
91       Num = 0xFFULL;
92       Truncated = true;
93     }
94     Version |= (Num << ShiftNum);
95   }
96 
97   if (Parts.size() > 3)
98     Truncated = true;
99 
100   return std::make_pair(true, Truncated);
101 }
102 
103 void PackedVersion::print(raw_ostream &OS) const {
104   OS << format("%d", getMajor());
105   if (getMinor() || getSubminor())
106     OS << format(".%d", getMinor());
107   if (getSubminor())
108     OS << format(".%d", getSubminor());
109 }
110 
111 } // end namespace MachO.
112 } // end namespace llvm.
113