/*
 * Copyright 2012 Haiku, Inc. All rights reserved.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *              Paweł Dziepak, pdziepak@quarnos.org
 */


#include "RequestInterpreter.h"

#include <string.h>

#include <util/kernel_cpp.h>


RequestInterpreter::RequestInterpreter(RPC::CallbackRequest* request)
        :
        fRequest(request)
{
        fOperationCount = fRequest->Stream().GetUInt();
}


RequestInterpreter::~RequestInterpreter()
{
        delete fRequest;
}


status_t
RequestInterpreter::GetAttr(FileHandle* handle, int* _mask)
{
        if (fLastOperation != OpCallbackGetAttr)
                return B_BAD_VALUE;

        uint32 size;
        const void* ptr = fRequest->Stream().GetOpaque(&size);
        handle->fSize = size;
        memcpy(handle->fData, ptr, size);

        uint32 count = fRequest->Stream().GetUInt();
        if (count < 1) {
                *_mask = 0;
                return fRequest->Stream().IsEOF() ? B_BAD_VALUE : B_OK;
        }

        uint32 bitmap = fRequest->Stream().GetUInt();
        uint32 mask = 0;

        if ((bitmap & (1 << FATTR4_CHANGE)) != 0)
                mask |= CallbackAttrChange;
        if ((bitmap & (1 << FATTR4_SIZE)) != 0)
                mask |= CallbackAttrSize;

        *_mask = mask;

        for (uint32 i = 1; i < count; i++)
                fRequest->Stream().GetUInt();

        return fRequest->Stream().IsEOF() ? B_BAD_VALUE : B_OK;
}


status_t
RequestInterpreter::Recall(FileHandle* handle, bool& truncate, uint32* stateSeq,
        uint32* stateID)
{
        if (fLastOperation != OpCallbackRecall)
                return B_BAD_VALUE;

        *stateSeq = fRequest->Stream().GetUInt();
        stateID[0] = fRequest->Stream().GetUInt();
        stateID[1] = fRequest->Stream().GetUInt();
        stateID[2] = fRequest->Stream().GetUInt();

        truncate = fRequest->Stream().GetBoolean();

        uint32 size;
        const void* ptr = fRequest->Stream().GetOpaque(&size);
        handle->fSize = size;
        memcpy(handle->fData, ptr, size);

        return fRequest->Stream().IsEOF() ? B_BAD_VALUE : B_OK;
}