DecompressString.cpp

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#include <shogun/preprocessor/DecompressString.h>

namespace shogun
{

template <class ST>
CDecompressString<ST>::CDecompressString() : CStringPreprocessor<ST>()
{
    compressor=NULL;
}

template <class ST>
CDecompressString<ST>::CDecompressString(E_COMPRESSION_TYPE ct) : CStringPreprocessor<ST>()
{
    compressor=new CCompressor(ct);
}

template <class ST>
CDecompressString<ST>::~CDecompressString()
{
    delete compressor;
}

template <class ST>
bool CDecompressString<ST>::init(CFeatures* f)
{
    ASSERT(f->get_feature_class()==C_STRING);
    return true;
}

template <class ST>
void CDecompressString<ST>::cleanup()
{
}

template <class ST>
bool CDecompressString<ST>::load(FILE* f)
{
    SG_SET_LOCALE_C;
    SG_RESET_LOCALE;
    return false;
}

template <class ST>
bool CDecompressString<ST>::save(FILE* f)
{
    SG_SET_LOCALE_C;
    SG_RESET_LOCALE;
    return false;
}

template <class ST>
bool CDecompressString<ST>::apply_to_string_features(CFeatures* f)
{
    int32_t i;
    int32_t num_vec=((CStringFeatures<ST>*)f)->get_num_vectors();

    for (i=0; i<num_vec; i++)
    {
        int32_t len=0;
        bool free_vec;
        ST* vec=((CStringFeatures<ST>*)f)->
            get_feature_vector(i, len, free_vec);

        ST* decompressed=apply_to_string(vec, len);
        ((CStringFeatures<ST>*)f)->
            free_feature_vector(vec, i, free_vec);
        ((CStringFeatures<ST>*)f)->
            cleanup_feature_vector(i);
        ((CStringFeatures<ST>*)f)->
            set_feature_vector(i, decompressed, len);
    }
    return true;
}

template <class ST>
ST* CDecompressString<ST>::apply_to_string(ST* f, int32_t &len)
{
    uint64_t compressed_size=((int32_t*) f)[0];
    uint64_t uncompressed_size=((int32_t*) f)[1];

    int32_t offs=CMath::ceil(2.0*sizeof(int32_t)/sizeof(ST));
    ASSERT(uint64_t(len)==uint64_t(offs)+compressed_size);

    len=uncompressed_size;
    uncompressed_size*=sizeof(ST);
    ST* vec=SG_MALLOC(ST, len);
    compressor->decompress((uint8_t*) (&f[offs]), compressed_size,
            (uint8_t*) vec, uncompressed_size);

    ASSERT(uncompressed_size==((uint64_t) len)*sizeof(ST));
    return vec;
}

template <class ST>
EPreprocessorType CDecompressString<ST>::get_type() const
{
    return P_DECOMPRESSSTRING;
}

template class CDecompressString<bool>;
template class CDecompressString<char>;
template class CDecompressString<int8_t>;
template class CDecompressString<uint8_t>;
template class CDecompressString<int16_t>;
template class CDecompressString<uint16_t>;
template class CDecompressString<int32_t>;
template class CDecompressString<uint32_t>;
template class CDecompressString<int64_t>;
template class CDecompressString<uint64_t>;
template class CDecompressString<float32_t>;
template class CDecompressString<float64_t>;
template class CDecompressString<floatmax_t>;
}