diff src/vamp-hostsdk/Files.cpp @ 390:06988ce35ff0 vh

Initial draft of C API for plugin loading

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/vamp-hostsdk/Files.cpp	Wed May 20 16:12:18 2015 +0100
@@ -0,0 +1,274 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Vamp
+
+    An API for audio analysis and feature extraction plugins.
+
+    Centre for Digital Music, Queen Mary, University of London.
+    Copyright 2006-2015 Chris Cannam and QMUL.
+  
+    Permission is hereby granted, free of charge, to any person
+    obtaining a copy of this software and associated documentation
+    files (the "Software"), to deal in the Software without
+    restriction, including without limitation the rights to use, copy,
+    modify, merge, publish, distribute, sublicense, and/or sell copies
+    of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be
+    included in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
+    ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+    CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+    WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+    Except as contained in this notice, the names of the Centre for
+    Digital Music; Queen Mary, University of London; and Chris Cannam
+    shall not be used in advertising or otherwise to promote the sale,
+    use or other dealings in this Software without prior written
+    authorization.
+*/
+
+#include <vamp-hostsdk/PluginHostAdapter.h>
+
+#include "Files.h"
+
+#include <cctype> // tolower
+
+#include <cstring>
+
+#ifdef _WIN32
+
+#include <windows.h>
+#include <tchar.h>
+#define PLUGIN_SUFFIX "dll"
+
+#else /* ! _WIN32 */
+
+#include <dirent.h>
+#include <dlfcn.h>
+
+#ifdef __APPLE__
+#define PLUGIN_SUFFIX "dylib"
+#else /* ! __APPLE__ */
+#define PLUGIN_SUFFIX "so"
+#endif /* ! __APPLE__ */
+
+#endif /* ! _WIN32 */
+
+using namespace std;
+
+vector<string>
+Files::listLibraryFiles()
+{
+    return listLibraryFilesMatching("");
+}
+
+vector<string>
+Files::listLibraryFilesMatching(string libraryName)
+{
+    vector<string> path = Vamp::PluginHostAdapter::getPluginPath();
+    vector<string> libraryFiles;
+
+    // we match case-insensitively
+    for (size_t i = 0; i < libraryName.length(); ++i) {
+	libraryName[i] = tolower(libraryName[i]);
+    }
+
+    for (size_t i = 0; i < path.size(); ++i) {
+        
+        vector<string> files = listFiles(path[i], PLUGIN_SUFFIX);
+
+        for (vector<string>::iterator fi = files.begin();
+             fi != files.end(); ++fi) {
+            
+            if (libraryName != "") {
+		// we match case-insensitively
+                string temp = *fi;
+                for (size_t i = 0; i < temp.length(); ++i) {
+                    temp[i] = tolower(temp[i]);
+                }
+                // libraryName should be lacking an extension, as it
+                // is supposed to have come from the plugin key
+                string::size_type pi = temp.find('.');
+                if (pi == string::npos) {
+                    if (libraryName != temp) continue;
+                } else {
+                    if (libraryName != temp.substr(0, pi)) continue;
+                }
+            }
+
+            string fullPath = path[i];
+            fullPath = splicePath(fullPath, *fi);
+	    libraryFiles.push_back(fullPath);
+	}
+    }
+
+    return libraryFiles;
+}
+
+void *
+Files::loadLibrary(string path)
+{
+    void *handle = 0;
+#ifdef _WIN32
+#ifdef UNICODE
+    int len = path.length() + 1; // cannot be more wchars than length in bytes of utf8 string
+    wchar_t *buffer = new wchar_t[len];
+    int rv = MultiByteToWideChar(CP_UTF8, 0, path.c_str(), len, buffer, len);
+    if (rv <= 0) {
+        cerr << "Vamp::HostExt: Unable to convert library path \""
+             << path << "\" to wide characters " << endl;
+        delete[] buffer;
+        return handle;
+    }
+    handle = LoadLibrary(buffer);
+    delete[] buffer;
+#else
+    handle = LoadLibrary(path.c_str());
+#endif
+    if (!handle) {
+        cerr << "Vamp::HostExt: Unable to load library \""
+             << path << "\"" << endl;
+    }
+#else
+    handle = dlopen(path.c_str(), RTLD_LAZY | RTLD_LOCAL);
+    if (!handle) {
+        cerr << "Vamp::HostExt: Unable to load library \""
+             << path << "\": " << dlerror() << endl;
+    }
+#endif
+    return handle;
+}
+
+void
+Files::unloadLibrary(void *handle)
+{
+#ifdef _WIN32
+    FreeLibrary((HINSTANCE)handle);
+#else
+    dlclose(handle);
+#endif
+}
+
+void *
+Files::lookupInLibrary(void *handle, const char *symbol)
+{
+#ifdef _WIN32
+    return (void *)GetProcAddress((HINSTANCE)handle, symbol);
+#else
+    return (void *)dlsym(handle, symbol);
+#endif
+}
+
+string
+Files::lcBasename(string path)
+{
+    string basename(path);
+	
+    string::size_type li = basename.rfind('/');
+    if (li != string::npos) basename = basename.substr(li + 1);
+
+    li = basename.find('.');
+    if (li != string::npos) basename = basename.substr(0, li);
+
+    for (size_t i = 0; i < basename.length(); ++i) {
+        basename[i] = tolower(basename[i]);
+    }
+
+    return basename;
+}
+
+string
+Files::splicePath(string a, string b)
+{
+#ifdef _WIN32
+    return a + "\\" + b;
+#else
+    return a + "/" + b;
+#endif
+}
+
+vector<string>
+Files::listFiles(string dir, string extension)
+{
+    vector<string> files;
+
+#ifdef _WIN32
+    string expression = dir + "\\*." + extension;
+#ifdef UNICODE
+    int len = expression.length() + 1; // cannot be more wchars than length in bytes of utf8 string
+    wchar_t *buffer = new wchar_t[len];
+    int rv = MultiByteToWideChar(CP_UTF8, 0, expression.c_str(), len, buffer, len);
+    if (rv <= 0) {
+        cerr << "Vamp::HostExt: Unable to convert wildcard path \""
+             << expression << "\" to wide characters" << endl;
+        delete[] buffer;
+        return files;
+    }
+    WIN32_FIND_DATA data;
+    HANDLE fh = FindFirstFile(buffer, &data);
+    if (fh == INVALID_HANDLE_VALUE) {
+        delete[] buffer;
+        return files;
+    }
+
+    bool ok = true;
+    while (ok) {
+        wchar_t *fn = data.cFileName;
+        int wlen = wcslen(fn) + 1;
+        int maxlen = wlen * 6;
+        char *conv = new char[maxlen];
+        int rv = WideCharToMultiByte(CP_UTF8, 0, fn, wlen, conv, maxlen, 0, 0);
+        if (rv > 0) {
+            files.push_back(conv);
+        }
+        delete[] conv;
+        ok = FindNextFile(fh, &data);
+    }
+
+    FindClose(fh);
+    delete[] buffer;
+#else
+    WIN32_FIND_DATA data;
+    HANDLE fh = FindFirstFile(expression.c_str(), &data);
+    if (fh == INVALID_HANDLE_VALUE) return files;
+
+    bool ok = true;
+    while (ok) {
+        files.push_back(data.cFileName);
+        ok = FindNextFile(fh, &data);
+    }
+
+    FindClose(fh);
+#endif
+#else
+
+    size_t extlen = extension.length();
+    DIR *d = opendir(dir.c_str());
+    if (!d) return files;
+            
+    struct dirent *e = 0;
+    while ((e = readdir(d))) {
+ 
+        if (!e->d_name) continue;
+       
+        size_t len = strlen(e->d_name);
+        if (len < extlen + 2 ||
+            e->d_name + len - extlen - 1 != "." + extension) {
+            continue;
+        }
+
+        files.push_back(e->d_name);
+    }
+
+    closedir(d);
+#endif
+
+    return files;
+}