int idx = 0;
        SMBUtil.writeInt2(transformCount, data, idx);
        idx += 2;
        SMBUtil.writeInt2(reserved1, data, idx);
        idx += 2;
        SMBUtil.writeInt4(reserved2, data, idx);
        idx += 4;

        // SMB_DIRECT_RDMA_TRANSFORM array (only one element)
        SMBUtil.writeInt2(rdmaTransformId, data, idx);
        idx += 2;
        SMBUtil.writeInt2(0, data, idx); // Reserved
        idx += 2;

        SMBUtil.writeInt2(this.fid, dst, dstIndex);
        dstIndex += 2;
        SMBUtil.writeInt4(this.offset, dst, dstIndex);
        dstIndex += 4;
        for (int i = 0; i < 4; i++) {
            dst[dstIndex++] = (byte) 0xFF;
        }
        SMBUtil.writeInt2(this.writeMode, dst, dstIndex);
        dstIndex += 2;
        SMBUtil.writeInt2(this.remaining, dst, dstIndex);
        dstIndex += 2;

        final int start = dstIndex;

        SMBUtil.writeInt2(this.tflags, dst, dstIndex);
        dstIndex += 2;
        SMBUtil.writeInt2(this.desiredAccess, dst, dstIndex);
        dstIndex += 2;
        SMBUtil.writeInt2(this.searchAttributes, dst, dstIndex);
        dstIndex += 2;
        SMBUtil.writeInt2(this.fileAttributes, dst, dstIndex);
        dstIndex += 2;
        this.creationTime = 0;

        final int start = dstIndex;

        writeInt2(fid, dst, dstIndex);
        dstIndex += 2;
        writeInt4(offset, dst, dstIndex);
        dstIndex += 4;
        writeInt2(maxCount, dst, dstIndex);
        dstIndex += 2;
        writeInt2(minCount, dst, dstIndex);
        dstIndex += 2;
        writeInt4(openTimeout, dst, dstIndex);
        dstIndex += 4;
        writeInt2(remaining, dst, dstIndex);
        dstIndex += 2;

        SMBUtil.writeInt2(PreauthIntegrityNegotiateContext.NEGO_CTX_PREAUTH_TYPE, buffer, ctxOffset);
        SMBUtil.writeInt2(38, buffer, ctxOffset + 2); // Data length
        ctxOffset += 8; // Skip reserved

        // Hash algorithm count and salt length
        SMBUtil.writeInt2(1, buffer, ctxOffset);
        SMBUtil.writeInt2(32, buffer, ctxOffset + 2);

        int testSecurityMode = 0x0001;
        int testDialect = 0x0202;

        // Write to buffer
        SMBUtil.writeInt4(testCapabilities, buffer, bufferIndex);
        System.arraycopy(testGuid, 0, buffer, bufferIndex + 4, 16);
        SMBUtil.writeInt2(testSecurityMode, buffer, bufferIndex + 20);
        SMBUtil.writeInt2(testDialect, buffer, bufferIndex + 22);

        // Execute decode

        int idx = 0;
        SMBUtil.writeInt2(minVersion, data, idx);
        idx += 2;
        SMBUtil.writeInt2(maxVersion, data, idx);
        idx += 2;
        SMBUtil.writeInt2(negotiatedVersion, data, idx);
        idx += 2;
        SMBUtil.writeInt2(reserved, data, idx);
        idx += 2;
        SMBUtil.writeInt2(creditsGranted, data, idx);
        idx += 2;

        if (this.largeFile) {
            SMBUtil.writeInt2(this.pid, dst, dstIndex);
            SMBUtil.writeInt4(this.byteOffset >> 32, dst, dstIndex + 4);
            SMBUtil.writeInt4(this.byteOffset & 0xFFFFFFFF, dst, dstIndex + 8);
            SMBUtil.writeInt4(this.lengthInBytes >> 32, dst, dstIndex + 12);
            SMBUtil.writeInt4(this.lengthInBytes & 0xFFFFFFFF, dst, dstIndex + 16);
            return 20;

        final int start = dstIndex;

        SMBUtil.writeInt2(this.fid, dst, dstIndex);
        dstIndex += 2;
        SMBUtil.writeInt4(this.offset, dst, dstIndex);
        dstIndex += 4;
        SMBUtil.writeInt2(this.maxCount, dst, dstIndex);
        dstIndex += 2;
        SMBUtil.writeInt2(this.minCount, dst, dstIndex);
        dstIndex += 2;
        SMBUtil.writeInt4(this.openTimeout, dst, dstIndex);
        dstIndex += 4;

        // inputOffset (relative to header start)
        SMBUtil.writeInt4(inputOffsetField, buf, pos);
        pos += 4;
        // inputCount
        SMBUtil.writeInt4(inputCount, buf, pos);
        pos += 4;
        // outputOffset (relative to header start)
        SMBUtil.writeInt4(outputOffsetField, buf, pos);
        pos += 4;
        // outputCount
        SMBUtil.writeInt4(outputCount, buf, pos);
        pos += 4;
        // ioctlFlags