Command-line utility to convert AU presets saved with a JUCE plug-in to XML state.

JucePluginAUPresetToXML.h

/*******************************************************************************
 The block below describes the properties of this PIP. A PIP is a short snippet
 of code that can be read by the Projucer and used to generate a JUCE project.

 BEGIN_JUCE_PIP_METADATA

  name:             JucePluginAUPresetToXML
  description:      Command-line utility to convert AU presets saved with a JUCE plug-in to XML state that can be loaded by AudioProcessorValueTreeState.

  dependencies:     juce_audio_basics, juce_audio_processors, juce_core, juce_data_structures, juce_events, 
                    juce_graphics, juce_gui_basics, juce_gui_extra
  exporters:        xcode_mac

  moduleFlags:      JUCE_STRICT_REFCOUNTEDPOINTER=1

  type:             Console
  mainClass:        AUPresetToXML

 END_JUCE_PIP_METADATA

*******************************************************************************/

#pragma once

#include <JuceHeader.h>

String readAUPreset (StringRef text)
{
    CFDataRef xmlData = CFDataCreate (kCFAllocatorDefault,
                                      reinterpret_cast<UInt8*>(text.text.getAddress()),
                                      static_cast<CFIndex>(text.length()));

    CFDictionaryRef dict = (CFDictionaryRef) CFPropertyListCreateWithData(kCFAllocatorDefault,
                                                                          xmlData,
                                                                          kCFPropertyListImmutable,
                                                                          NULL,
                                                                          NULL);

    CFDataRef data = nullptr;
    CFStringRef key = CFStringCreateWithCString (kCFAllocatorDefault, "jucePluginState", kCFStringEncodingUTF8);

    bool valuePresent = CFDictionaryGetValueIfPresent (dict, key, (const void**) &data);
    CFRelease (key);

    if (valuePresent)
    {
        if (data != nullptr)
        {
            const int numBytes = (int) CFDataGetLength (data);
            const juce::uint8* const bytes = CFDataGetBytePtr (data);

            if (numBytes > 0)
            {
                MemoryBlock data (bytes, numBytes);

                if (auto preset = AudioProcessor::getXmlFromBinary (data.getData(), int (data.getSize())))
                {
                    return preset->toString();
                }
            }
        }
    }
    return {};
}

void convertAUPresetFileToXML (File auPresetFile)
{
    if (!auPresetFile.exists())
        ConsoleApplication::fail (auPresetFile.getFullPathName() + " doesn't exist");
    if (auPresetFile.isDirectory())
        ConsoleApplication::fail (auPresetFile.getFullPathName() + " is a directory");
    if (auPresetFile.getFileExtension() != ".aupreset")
        ConsoleApplication::fail (auPresetFile.getFullPathName() + " is not an aupreset file");

    StringArray lines;
    auPresetFile.readLines (lines);

    if (lines.size() == 0)
        ConsoleApplication::fail ("Failed to read input file: "
                                  + auPresetFile.getFullPathName());

    auto xml = readAUPreset (lines.joinIntoString (""));

    File xmlFile = auPresetFile.withFileExtension ("xml");
    Result createAction = xmlFile.create();

    if (createAction.failed())
        ConsoleApplication::fail ("Failed to create output file (" +
                                  createAction.getErrorMessage() +
                                  "): " +
                                  xmlFile.getFullPathName());

    if (!xmlFile.replaceWithText (xml))
        ConsoleApplication::fail ("Failed to write to output file: " +
                                  xmlFile.getFullPathName());
}

//==============================================================================
int main (int argc, char* argv[])
{
    ConsoleApplication app;

    app.addHelpCommand ("--help|-h", "Usage:", true);
    app.addVersionCommand ("--version|-v", "JucePluginAUPresetToXML version 1.0.0");

    app.addCommand ({ "--convert",
                      "--convert=filename",
                      "Converts an .aupreset file to XML.",
                      "Parses an .aupreset file and attempts to extract juce "
                      "ValueTree XML data. If found, outputs the data to a new "
                      "XML file in the same location as the original.",
                      [](const ArgumentList& args)
                      {
                          auto file = args.getFileForOption ("--convert");
                          convertAUPresetFileToXML (file);
                      }
    });

    return app.findAndRunCommand (argc, argv);
}