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99dee823 | 1 | // Copyright (C) 2003-2021 Free Software Foundation, Inc. |
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2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
748086b7 | 6 | // Free Software Foundation; either version 3, or (at your option) |
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7 | // any later version. |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
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15 | // with this library; see the file COPYING3. If not see |
16 | // <http://www.gnu.org/licenses/>. | |
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17 | |
18 | // 27.8.1.4 Overridden virtual functions | |
19 | ||
20 | #include <fstream> | |
21 | #include <locale> | |
22 | #include <cstdio> | |
23 | #include <testsuite_hooks.h> | |
24 | ||
25 | template <typename InternT, typename StateT = mbstate_t> | |
26 | class checksumcvt : public std::codecvt<InternT, char, StateT> | |
27 | { | |
28 | typedef std::codecvt<InternT, char, StateT> Base; | |
29 | static const size_t width = sizeof(InternT) + 1; | |
30 | ||
31 | public: | |
32 | typedef InternT intern_type; | |
33 | typedef char extern_type; | |
34 | ||
35 | explicit checksumcvt(size_t refs = 0) | |
36 | : Base(refs) | |
37 | { } | |
38 | ||
39 | protected: | |
40 | virtual typename std::codecvt<InternT, char, StateT>::result | |
41 | do_out(StateT&, const intern_type* from, | |
42 | const intern_type* from_end, const intern_type*& from_next, | |
43 | extern_type* to, extern_type* to_end, | |
44 | extern_type*& to_next) const | |
45 | { | |
46 | size_t len = std::min(static_cast<size_t>(from_end - from), | |
47 | static_cast<size_t>(to_end - to) / width); | |
48 | ||
49 | while (len--) | |
50 | { | |
51 | const char* p = reinterpret_cast<const char*>(from); | |
52 | unsigned char checksum = 0; | |
53 | ||
54 | for (size_t i = 0; i < sizeof(intern_type); ++i) | |
55 | { | |
56 | *to++ = p[i]; | |
57 | checksum ^= static_cast<unsigned char>(p[i]); | |
58 | } | |
59 | ||
60 | *to++ = checksum; | |
61 | ++from; | |
62 | } | |
63 | ||
64 | from_next = from; | |
65 | to_next = to; | |
66 | return from_next == from_end ? std::codecvt<InternT, char, StateT>::ok | |
67 | : std::codecvt<InternT, char, StateT>::partial; | |
68 | } | |
69 | ||
70 | virtual typename std::codecvt<InternT, char, StateT>::result | |
71 | do_unshift(StateT&, extern_type* to, | |
72 | extern_type*, extern_type*& to_next) const | |
73 | { | |
74 | to_next = to; | |
75 | return std::codecvt<InternT, char, StateT>::ok; | |
76 | } | |
77 | ||
78 | virtual typename std::codecvt<InternT, char, StateT>::result | |
79 | do_in(StateT&, const extern_type* from, | |
80 | const extern_type* from_end, const extern_type*& from_next, | |
81 | intern_type* to, intern_type* to_end, | |
82 | intern_type*& to_next) const | |
83 | { | |
84 | size_t len = std::min(static_cast<size_t>(to_end - to), | |
85 | static_cast<size_t>(from_end - from) / width); | |
86 | ||
87 | while (len) | |
88 | { | |
89 | const char* f = from; | |
90 | intern_type tmp; | |
91 | char* p = reinterpret_cast<char*>(&tmp); | |
92 | unsigned char checksum = 0; | |
93 | ||
94 | for (size_t i = 0; i < sizeof(intern_type); ++i) | |
95 | { | |
96 | p[i] = *f; | |
97 | checksum ^= static_cast<unsigned char>(*f++); | |
98 | } | |
99 | ||
100 | if (*f++ != checksum) | |
101 | break; | |
102 | ||
103 | from = f; | |
104 | *to++ = tmp; | |
105 | len--; | |
106 | } | |
107 | ||
108 | from_next = from; | |
109 | to_next = to; | |
110 | return len ? std::codecvt<InternT, char, StateT>::error : | |
111 | (from_next == from_end ? std::codecvt<InternT, char, StateT>::ok | |
112 | : std::codecvt<InternT, char, StateT>::partial); | |
113 | } | |
114 | ||
115 | virtual int | |
116 | do_encoding() const throw() | |
117 | { return width; } | |
118 | ||
119 | virtual int | |
120 | do_length(StateT&, const extern_type* from, | |
121 | const extern_type* end, size_t max) const | |
122 | { | |
123 | size_t len = std::min(max, static_cast<size_t>(end - from) / width); | |
124 | ||
125 | int ret = 0; | |
126 | while (len--) | |
127 | { | |
128 | unsigned char checksum = 0; | |
129 | ||
130 | for (size_t i = 0; i < sizeof(intern_type); ++i) | |
131 | { | |
132 | checksum ^= static_cast<unsigned char>(*from++); | |
133 | } | |
134 | ||
135 | if (*from++ != checksum) | |
136 | break; | |
137 | ||
138 | ret++; | |
139 | } | |
140 | ||
141 | return ret; | |
142 | } | |
143 | ||
144 | virtual int | |
145 | do_max_length() const throw() | |
146 | { return width; } | |
147 | ||
148 | virtual bool | |
149 | do_always_noconv() const throw() | |
150 | { return false; } | |
151 | }; | |
152 | ||
153 | // libstdc++/11544 (incomplete character in file) | |
154 | void test01() | |
155 | { | |
156 | using namespace std; | |
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157 | |
158 | locale loc(locale::classic(), new checksumcvt<wchar_t>); | |
159 | ||
160 | const char* name = "tmp_11544-1"; | |
161 | ||
162 | FILE* f = fopen(name, "w"); | |
163 | putc('a', f); | |
164 | fclose(f); | |
165 | ||
166 | wifstream in; | |
167 | in.imbue(loc); | |
168 | in.open(name); | |
169 | ||
170 | VERIFY( in.good() ); | |
171 | in.get(); | |
172 | VERIFY( !in.good() ); | |
173 | VERIFY( in.bad() ); | |
174 | VERIFY( !in.eof() ); | |
175 | ||
176 | in.close(); | |
177 | } | |
178 | ||
179 | int main() | |
180 | { | |
181 | test01(); | |
182 | return 0; | |
183 | } |