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comparison DPF-Prymula-audioplugins/dpf/distrho/extra/LibraryUtils.hpp @ 3:84e66ea83026

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DPF-Prymula-audioplugins-0.231015-2
author prymula <prymula76@outlook.com>
date Mon, 16 Oct 2023 21:53:34 +0200
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2:cf2cb71d31dd 3:84e66ea83026
1 /*
2 * DISTRHO Plugin Framework (DPF)
3 * Copyright (C) 2012-2021 Filipe Coelho <falktx@falktx.com>
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any purpose with
6 * or without fee is hereby granted, provided that the above copyright notice and this
7 * permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
10 * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
11 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
13 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 #ifndef DISTRHO_LIBRARY_UTILS_HPP_INCLUDED
18 #define DISTRHO_LIBRARY_UTILS_HPP_INCLUDED
19
20 #include "../DistrhoUtils.hpp"
21
22 #ifdef DISTRHO_OS_WINDOWS
23 # ifndef NOMINMAX
24 # define NOMINMAX
25 # endif
26 # include <winsock2.h>
27 # include <windows.h>
28 typedef HMODULE lib_t;
29 #else
30 # include <dlfcn.h>
31 typedef void* lib_t;
32 #endif
33
34 START_NAMESPACE_DISTRHO
35
36 // -----------------------------------------------------------------------
37 // library related calls
38
39 /*
40 * Open 'filename' library (must not be null).
41 * May return null, in which case "lib_error" has the error.
42 */
43 static inline
44 lib_t lib_open(const char* const filename) noexcept
45 {
46 DISTRHO_SAFE_ASSERT_RETURN(filename != nullptr && filename[0] != '\0', nullptr);
47
48 try {
49 #ifdef DISTRHO_OS_WINDOWS
50 return ::LoadLibraryA(filename);
51 #else
52 return ::dlopen(filename, RTLD_NOW|RTLD_LOCAL);
53 #endif
54 } DISTRHO_SAFE_EXCEPTION_RETURN("lib_open", nullptr);
55 }
56
57 /*
58 * Close a previously opened library (must not be null).
59 * If false is returned, "lib_error" has the error.
60 */
61 static inline
62 bool lib_close(const lib_t lib) noexcept
63 {
64 DISTRHO_SAFE_ASSERT_RETURN(lib != nullptr, false);
65
66 try {
67 #ifdef DISTRHO_OS_WINDOWS
68 return ::FreeLibrary(lib);
69 #else
70 return (::dlclose(lib) == 0);
71 #endif
72 } DISTRHO_SAFE_EXCEPTION_RETURN("lib_close", false);
73 }
74
75 /*
76 * Get a library symbol (must not be null).
77 * Returns null if the symbol is not found.
78 */
79 template<typename Func>
80 static inline
81 Func lib_symbol(const lib_t lib, const char* const symbol) noexcept
82 {
83 DISTRHO_SAFE_ASSERT_RETURN(lib != nullptr, nullptr);
84 DISTRHO_SAFE_ASSERT_RETURN(symbol != nullptr && symbol[0] != '\0', nullptr);
85
86 try {
87 #ifdef DISTRHO_OS_WINDOWS
88 # if defined(__GNUC__) && (__GNUC__ >= 9)
89 # pragma GCC diagnostic push
90 # pragma GCC diagnostic ignored "-Wcast-function-type"
91 # endif
92 return (Func)::GetProcAddress(lib, symbol);
93 # if defined(__GNUC__) && (__GNUC__ >= 9)
94 # pragma GCC diagnostic pop
95 # endif
96 #else
97 return (Func)(uintptr_t)::dlsym(lib, symbol);
98 #endif
99 } DISTRHO_SAFE_EXCEPTION_RETURN("lib_symbol", nullptr);
100 }
101
102 /*
103 * Return the last operation error ('filename' must not be null).
104 * May return null.
105 */
106 static inline
107 const char* lib_error(const char* const filename) noexcept
108 {
109 DISTRHO_SAFE_ASSERT_RETURN(filename != nullptr && filename[0] != '\0', nullptr);
110
111 #ifdef DISTRHO_OS_WINDOWS
112 static char libError[2048+1];
113 std::memset(libError, 0, sizeof(libError));
114
115 try {
116 const DWORD winErrorCode = ::GetLastError();
117 const int winErrorFlags = FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS;
118 LPVOID winErrorString;
119
120 ::FormatMessage(winErrorFlags, nullptr, winErrorCode, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)&winErrorString, 0, nullptr);
121
122 std::snprintf(libError, 2048, "%s: error code %li: %s", filename, winErrorCode, (const char*)winErrorString);
123 ::LocalFree(winErrorString);
124 } DISTRHO_SAFE_EXCEPTION("lib_error");
125
126 return (libError[0] != '\0') ? libError : nullptr;
127 #else
128 return ::dlerror();
129 #endif
130 }
131
132 // -----------------------------------------------------------------------
133
134 END_NAMESPACE_DISTRHO
135
136 #endif // DISTRHO_LIBRARY_UTILS_HPP_INCLUDED