Method decompress

ffsengine.cpp:2757–2886

Compression routines

// Compression routines
UINT8 FfsEngine::decompress(const QByteArray & compressedData, const UINT8 compressionType, QByteArray & decompressedData, UINT8 * algorithm)
{
    const UINT8* data;
    UINT32 dataSize;
    UINT8* decompressed;
    UINT32 decompressedSize = 0;
    UINT8* scratch;
    UINT32 scratchSize = 0;
    const EFI_TIANO_HEADER* header;

    switch (compressionType)
    {
    case EFI_NOT_COMPRESSED:
        decompressedData = compressedData;
        if (algorithm)
            *algorithm = COMPRESSION_ALGORITHM_NONE;
        return ERR_SUCCESS;
    case EFI_STANDARD_COMPRESSION:
        // Get buffer sizes
        data = (UINT8*)compressedData.data();
        dataSize = compressedData.size();

        // Check header to be valid
        header = (const EFI_TIANO_HEADER*)data;
        if (header->CompSize + sizeof(EFI_TIANO_HEADER) != dataSize)
            return ERR_STANDARD_DECOMPRESSION_FAILED;

        // Get info function is the same for both algorithms
        if (ERR_SUCCESS != EfiTianoGetInfo(data, dataSize, &decompressedSize, &scratchSize))
            return ERR_STANDARD_DECOMPRESSION_FAILED;

        // Allocate memory
        decompressed = new UINT8[decompressedSize];
        scratch = new UINT8[scratchSize];

        // Decompress section data

        //TODO: separate EFI1.1 from Tiano another way
        // Try Tiano decompression first
        if (ERR_SUCCESS != TianoDecompress(data, dataSize, decompressed, decompressedSize, scratch, scratchSize)) {
            // Not Tiano, try EFI 1.1
            if (ERR_SUCCESS != EfiDecompress(data, dataSize, decompressed, decompressedSize, scratch, scratchSize)) {
                if (algorithm)
                    *algorithm = COMPRESSION_ALGORITHM_UNKNOWN;

                delete[] decompressed;
                delete[] scratch;
                return ERR_STANDARD_DECOMPRESSION_FAILED;
            }
            else if (algorithm)
                *algorithm = COMPRESSION_ALGORITHM_EFI11;
        }
        else if (algorithm)
            *algorithm = COMPRESSION_ALGORITHM_TIANO;

        if (decompressedSize > INT32_MAX) {
            delete[] decompressed;
            delete[] scratch;