Function ReadBinaryDataArray

deps/assimp/code/AssetLib/FBX/FBXParser.cpp:532–590

------------------------------------------------------------------------------------------------ read binary data array, assume cursor points to the 'compression mode' field (i.e. behind the header)

// ------------------------------------------------------------------------------------------------
// read binary data array, assume cursor points to the 'compression mode' field (i.e. behind the header)
void ReadBinaryDataArray(char type, uint32_t count, const char*& data, const char* end,
        std::vector<char>& buff, const Element& /*el*/) {
    BE_NCONST uint32_t encmode = SafeParse<uint32_t>(data, end);
    AI_SWAP4(encmode);
    data += 4;

    // next comes the compressed length
    BE_NCONST uint32_t comp_len = SafeParse<uint32_t>(data, end);
    AI_SWAP4(comp_len);
    data += 4;

    ai_assert(data + comp_len == end);

    // determine the length of the uncompressed data by looking at the type signature
    uint32_t stride = 0;
    switch(type)
    {
        case 'f':
        case 'i':
            stride = 4;
            break;

        case 'd':
        case 'l':
            stride = 8;
            break;

        default:
            ai_assert(false);
    };

    const uint32_t full_length = stride * count;
    buff.resize(full_length);

    if(encmode == 0) {
        ai_assert(full_length == comp_len);

        // plain data, no compression
        std::copy(data, end, buff.begin());
    }
    else if(encmode == 1) {
        // zlib/deflate, next comes ZIP head (0x78 0x01)
        // see http://www.ietf.org/rfc/rfc1950.txt
         Compression compress;
        if (compress.open(Compression::Format::Binary, Compression::FlushMode::Finish, 0)) {
            compress.decompress(data, comp_len, buff);
            compress.close();
        }
    }
#ifdef ASSIMP_BUILD_DEBUG
    else {
        // runtime check for this happens at tokenization stage
        ai_assert(false);
    }
#endif

    data += comp_len;
    ai_assert(data == end);