annotate src/knownplugins.cpp @ 64:e839338d3869 tip

Further Windows fix

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
/*
  Copyright (c) 2016-2018 Queen Mary, University of London

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  obtaining a copy of this software and associated documentation
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  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.

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  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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  CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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*/

#include "knownplugins.h"

#include <iostream>

using namespace std;

#if defined(_WIN32)
#include <windows.h>
#define PATH_SEPARATOR ';'
#else
#define PATH_SEPARATOR ':'
#endif

static bool
getEnvUtf8(std::string variable, std::string &value)
{
    value = "";
    
#ifdef _WIN32
    int wvarlen = MultiByteToWideChar(CP_UTF8, 0,
                                      variable.c_str(), int(variable.length()),
                                      0, 0);
    if (wvarlen < 0) {
        cerr << "WARNING: Unable to convert environment variable name "
             << variable << " to wide characters" << endl;
        return false;
    }
    
    wchar_t *wvarbuf = new wchar_t[wvarlen + 1];
    (void)MultiByteToWideChar(CP_UTF8, 0,
                              variable.c_str(), int(variable.length()),
                              wvarbuf, wvarlen);
    wvarbuf[wvarlen] = L'\0';
    
    wchar_t *wvalue = _wgetenv(wvarbuf);

    delete[] wvarbuf;

    if (!wvalue) {
        return false;
    }

    int wvallen = int(wcslen(wvalue));
    int vallen = WideCharToMultiByte(CP_UTF8, 0,
                                     wvalue, wvallen,
                                     0, 0, 0, 0);
    if (vallen < 0) {
        cerr << "WARNING: Unable to convert environment value to UTF-8" << endl;
        return false;
    }

    char *val = new char[vallen + 1];
    (void)WideCharToMultiByte(CP_UTF8, 0,
                              wvalue, wvallen,
                              val, vallen, 0, 0);
    val[vallen] = '\0';

    value = val;

    delete[] val;
    return true;

#else

    char *val = getenv(variable.c_str());
    if (!val) {
        return false;
    }

    value = val;
    return true;
    
#endif
}

KnownPlugins::KnownPlugins(BinaryFormat format) :
    m_format(format)
{
    string variableSuffix = "";
    if (m_format == FormatNonNative32Bit) {
        variableSuffix = "_32";
    }
    
    m_known[VampPlugin] = {
        "vamp",
        "VAMP_PATH" + variableSuffix,
        {}, {},
        "vampGetPluginDescriptor"
    };
    
    m_known[LADSPAPlugin] = {
        "ladspa",
        "LADSPA_PATH" + variableSuffix,
        {}, {},
        "ladspa_descriptor"
    };

    m_known[DSSIPlugin] = {
        "dssi",
        "DSSI_PATH" + variableSuffix,
        {}, {},
        "dssi_descriptor"
    };

    for (auto &k: m_known) {
        k.second.defaultPath = expandPathString(getDefaultPathString(k.first));
        k.second.path = expandConventionalPath(k.first, k.second.variable);
    }
}

vector<KnownPlugins::PluginType>
KnownPlugins::getKnownPluginTypes() const
{
    vector<PluginType> kt;

    for (const auto &k: m_known) {
        kt.push_back(k.first);
    }

    return kt;
}

string
KnownPlugins::getUnexpandedDefaultPathString(PluginType type)
{
    switch (type) {

#if defined(_WIN32)

    case VampPlugin:
        return "%ProgramFiles%\\Vamp Plugins";
    case LADSPAPlugin:
        return "%ProgramFiles%\\LADSPA Plugins;%ProgramFiles%\\Audacity\\Plug-Ins";
    case DSSIPlugin:
        return "%ProgramFiles%\\DSSI Plugins";
        
#elif defined(__APPLE__)
        
    case VampPlugin:
        return "$HOME/Library/Audio/Plug-Ins/Vamp:/Library/Audio/Plug-Ins/Vamp";
    case LADSPAPlugin:
        return "$HOME/Library/Audio/Plug-Ins/LADSPA:/Library/Audio/Plug-Ins/LADSPA";
    case DSSIPlugin:
        return "$HOME/Library/Audio/Plug-Ins/DSSI:/Library/Audio/Plug-Ins/DSSI";
        
#else /* Linux, BSDs, etc */
        
    case VampPlugin:
        return "$HOME/vamp:$HOME/.vamp:/usr/local/lib/vamp:/usr/lib/vamp";
    case LADSPAPlugin:
        return "$HOME/ladspa:$HOME/.ladspa:/usr/local/lib/ladspa:/usr/lib/ladspa";
    case DSSIPlugin:
        return "$HOME/dssi:$HOME/.dssi:/usr/local/lib/dssi:/usr/lib/dssi";
#endif
    }

    throw logic_error("unknown or unhandled plugin type");
}

string
KnownPlugins::getDefaultPathString(PluginType type)
{
    string path = getUnexpandedDefaultPathString(type);

    if (path == "") {
        return path;
    }

    string home;
    if (getEnvUtf8("HOME", home)) {
        string::size_type f;
        while ((f = path.find("$HOME")) != string::npos &&
               f < path.length()) {
            path.replace(f, 5, home);
        }
    }

#ifdef _WIN32
    string pfiles, pfiles32;
    if (!getEnvUtf8("ProgramFiles", pfiles)) {
        pfiles = "C:\\Program Files";
    }
    if (!getEnvUtf8("ProgramFiles(x86)", pfiles32)) {
        pfiles32 = "C:\\Program Files (x86)";
    }
    
    string::size_type f;
    while ((f = path.find("%ProgramFiles%")) != string::npos &&
           f < path.length()) {
        if (m_format == FormatNonNative32Bit) {
            path.replace(f, 14, pfiles32);
        } else {
            path.replace(f, 14, pfiles);
        }
    }
#endif

    return path;
}

vector<string>
KnownPlugins::expandPathString(string path)
{
    vector<string> pathList;

    string::size_type index = 0, newindex = 0;

    while ((newindex = path.find(PATH_SEPARATOR, index)) < path.size()) {
        pathList.push_back(path.substr(index, newindex - index).c_str());
        index = newindex + 1;
    }
    
    pathList.push_back(path.substr(index));

    return pathList;
}

vector<string>
KnownPlugins::expandConventionalPath(PluginType type, string var)
{
    string path;

    if (!getEnvUtf8(var, path)) {
        path = getDefaultPathString(type);
    }

    return expandPathString(path);
}