JUCE/modules/juce_audio_plugin_client/LV2/juce_LV2TurtleDumpProgram.cpp

/*
  ==============================================================================

   This file is part of the JUCE 7 technical preview.
   Copyright (c) 2022 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For the technical preview this file cannot be licensed commercially.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

#ifdef _WIN32
 #include <windows.h>
 HMODULE dlopen (const char* filename, int) { return LoadLibrary (filename); }
 FARPROC dlsym (HMODULE handle, const char* name) { return GetProcAddress (handle, name); }
 enum { RTLD_LAZY = 0 };
#else
 #include <dlfcn.h>
#endif

#include <cstdint>

// Replicating some of the LV2 header here so that we don't have to set up any
// custom include paths for this file.
// Normally this would be a bad idea, but the LV2 API has to keep these definitions
// in order to remain backwards-compatible.

extern "C"
{
    typedef struct LV2_Descriptor
    {
        const void* a;
        const void* b;
        const void* c;
        const void* d;
        const void* e;
        const void* f;
        const void* g;
        const void* (*extension_data)(const char* uri);
    } LV2_Descriptor;
}

int main (int argc, const char** argv)
{
    if (argc != 2)
        return 1;

    const auto* libraryPath = argv[1];

    struct RecallFeature
    {
        int (*doRecall) (const char*);
    };

    if (auto* handle = dlopen (libraryPath, RTLD_LAZY))
        if (auto* getDescriptor = reinterpret_cast<const LV2_Descriptor* (*) (uint32_t)> (dlsym (handle, "lv2_descriptor")))
            if (auto* descriptor = getDescriptor (0))
                if (auto* extensionData = descriptor->extension_data)
                    if (auto* recallFeature = reinterpret_cast<const RecallFeature*> (extensionData ("https://lv2-extensions.juce.com/turtle_recall")))
                        if (auto* doRecall = recallFeature->doRecall)
                            return doRecall (libraryPath);

    return 1;
}