CWE-ou-minkata/Sources/Plasma/FeatureLib/pfPython/plPythonPack.cpp

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*==LICENSE==*/

#include <Python.h>
#include <marshal.h>
#include <ctime>
#include <string>

#include "HeadSpin.h"
#include "hsStream.h"
#pragma hdrstop

#include "plPythonPack.h"

#include "plFile/plSecureStream.h"
#include "plFile/plStreamSource.h"

static const char* kPackFilePath = ".\\Python\\";

struct plPackOffsetInfo
{
    uint32_t fOffset;
    uint32_t fStreamIndex; // index of the stream object in the plPythonPack object that the file resides in
};

class plPythonPack
{
protected:
    std::vector<hsStream*> fPackStreams;
    bool fPackNotFound;     // No pack file, don't keep trying

    typedef std::map<plString, plPackOffsetInfo> FileOffset;
    FileOffset fFileOffsets;

    plPythonPack();

public:
    ~plPythonPack();

    static plPythonPack& Instance();

    bool Open();
    void Close();

    PyObject* OpenPacked(const plString& sfileName);
    bool IsPackedFile(const plString& fileName);
};

PyObject* PythonPack::OpenPythonPacked(const plString& fileName)
{
    return plPythonPack::Instance().OpenPacked(fileName);
}

bool PythonPack::IsItPythonPacked(const plString& fileName)
{
    return plPythonPack::Instance().IsPackedFile(fileName);
}

plPythonPack::plPythonPack() : fPackNotFound(false)
{
}

plPythonPack::~plPythonPack()
{
    Close();
}

plPythonPack& plPythonPack::Instance()
{
    static plPythonPack theInstance;
    return theInstance;
}

bool plPythonPack::Open()
{
    if (fPackStreams.size() > 0)
        return true;
    
    // We already tried and it wasn't there
    if (fPackNotFound)
        return false;

    fPackNotFound = true;

    // Get the names of all the pak files
    std::vector<plFileName> files = plStreamSource::GetInstance()->GetListOfNames("python", "pak");

    std::vector<time_t> modTimes; // the modification time for each of the streams (to resolve duplicate file issues)

    // grab all the .pak files in the folder
    for (int curName = 0; curName < files.size(); curName++)
    {
        // obtain the stream
        hsStream *fPackStream = plStreamSource::GetInstance()->GetFile(files[curName]);
        if (fPackStream)
        {
            fPackStream->Rewind(); // make sure we're at the beginning of the file
            fPackNotFound = false;

            time_t curModTime = 0;
            plFileInfo info(files[curName]);
            if (info.Exists())
                curModTime = info.ModifyTime();
            modTimes.push_back(curModTime);

            // read the index data
            int numFiles = fPackStream->ReadLE32();
            uint32_t streamIndex = (uint32_t)(fPackStreams.size());
            for (int i = 0; i < numFiles; i++)
            {
                // and pack the index into our own data structure
                plString pythonName = fPackStream->ReadSafeString();
                uint32_t offset = fPackStream->ReadLE32();

                plPackOffsetInfo offsetInfo;
                offsetInfo.fOffset = offset;
                offsetInfo.fStreamIndex = streamIndex;

                if (fFileOffsets.find(pythonName) != fFileOffsets.end())
                {
                    uint32_t index = fFileOffsets[pythonName].fStreamIndex;
                    if (modTimes[index] < curModTime) // is the existing file older then the new one?
                        fFileOffsets[pythonName] = offsetInfo; // yup, so replace it with the new info
                }
                else
                    fFileOffsets[pythonName] = offsetInfo; // no conflicts, add the info
            }
            fPackStreams.push_back(fPackStream);
        }
    }

    return !fPackNotFound;
}

void plPythonPack::Close()
{
    if (fPackStreams.size() == 0)
        return;
    
    int i;
    for (i=0; i<fPackStreams.size(); i++)
    {
        hsStream* fPackStream = fPackStreams[i];

        // do NOT close or delete the streams, the preloader will do that for us
        fPackStreams[i] = nil;
    }

    fPackStreams.clear();
    fFileOffsets.clear();
}

PyObject* plPythonPack::OpenPacked(const plString& fileName)
{
    if (!Open())
        return nil;

    plString pythonName = fileName + ".py";

    FileOffset::iterator it = fFileOffsets.find(pythonName);
    if (it != fFileOffsets.end())
    {
        plPackOffsetInfo offsetInfo = (*it).second;
        hsStream* fPackStream = fPackStreams[offsetInfo.fStreamIndex];
        
        fPackStream->SetPosition(offsetInfo.fOffset);

        int32_t size = fPackStream->ReadLE32();
        if (size > 0)
        {
            char *buf = new char[size];
            uint32_t readSize = fPackStream->Read(size, buf);
            hsAssert(readSize <= size, plFormat("Python PackFile {}: Incorrect amount of data, read {} instead of {}",
                     fileName, readSize, size).c_str());

            // let the python marshal make it back into a code object
            PyObject *pythonCode = PyMarshal_ReadObjectFromString(buf, size);

            delete [] buf;

            return pythonCode;
        }
    }

    return nil;
}

bool plPythonPack::IsPackedFile(const plString& fileName)
{
    if (!Open())
        return false;

    plString pythonName = fileName + ".py";

    FileOffset:: iterator it = fFileOffsets.find(pythonName);
    if (it != fFileOffsets.end())
        return true;

    return false;
}