ethernetbuffer.c

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/******************************************************
* Function: etherent buffer handler
*
* File:   etherentbuffer.c
* Author: Book Chen
* Date:   2008.07.18
*******************************************************
*/
#include "includes.h"

ETHBUFFER_CONTROL EthBufferCtrl;
ETHBUFFER EthBuffer[ETHBUFFER_NUMBER];

void F_EthernetBufferInit(void);
void F_EthernetBufferSvc(void);
void F_EthernetBufferReset(ETHBUFFER *pBuffer);
ETHBUFFER *F_EthernetBufferAllocate(void);
void F_EthernetBufferRelease(ETHBUFFER *pBuffer);
INT8U *F_EthernetBufferPut(ETHBUFFER *pBuffer,INT32U Length);
INT8U *F_EthernetBufferPull(ETHBUFFER *pBuffer,INT32U Length);
INT8U *F_EthernetBufferPush(ETHBUFFER *pBuffer,INT32U Length);
void F_EthernetBufferReserve(ETHBUFFER *pBuffer,INT32U Length);

void F_EthernetBufferInit(void){
    EthBufferCtrl.BufferIndex=0; 
    EthBufferCtrl.Status=0;     
    EthBufferCtrl.State=0;  
}
void F_EthernetBufferSvc(void){}
void F_EthernetBufferReset(ETHBUFFER *pBuffer){
    //memset(pBuffer,0,sizeof(ETHBUFFER));
    memset(pBuffer,0,5);
    pBuffer->Pad[0]=0x00;
    pBuffer->Pad[1]=0x00;
    pBuffer->TrueSize=ETHERNET_FRAME_LEN; // 1514
    pBuffer->pData=(INT8U *)pBuffer->Data; 
    pBuffer->Length=0;
}
ETHBUFFER *F_EthernetBufferAllocate(void){
    ETHBUFFER *pBuffer;
    
    pBuffer=&EthBuffer[EthBufferCtrl.BufferIndex];
    EthBufferCtrl.BufferIndex++;
    if(EthBufferCtrl.BufferIndex>=5) EthBufferCtrl.BufferIndex=0;
    F_EthernetBufferReset(pBuffer);
    return pBuffer;
}
void F_EthernetBufferRelease(ETHBUFFER *pBuffer){}
INT8U *F_EthernetBufferPut(ETHBUFFER *pBuffer,INT32U Length){
    pBuffer->Length+=Length;
    return pBuffer->pData; 
}
// pull...means add data to frame...frame data pointer pull forward
// pull...means add data to frame...frame data length--
INT8U *F_EthernetBufferPull(ETHBUFFER *pBuffer,INT32U Length){
    pBuffer->pData+=Length;
    pBuffer->Length-=Length;
    return pBuffer->pData; 
}
// push...means add data to frame...frame data pointer push back
// push...means add data to frame...frame data length++
INT8U *F_EthernetBufferPush(ETHBUFFER *pBuffer,INT32U Length){
    pBuffer->pData-=Length;    
    pBuffer->Length+=Length;   
    return pBuffer->pData; 
}
void F_EthernetBufferReserve(ETHBUFFER *pBuffer,INT32U Length){
    pBuffer->pData+=Length;
}
void F_EthernetBufferDump(INT8U *pData,INT32U Length){
    INT32U i=0,j=0;
    
    i=0;
    j=0;              
    printf("\n Length=%4x ",Length);
    for(i=0;i<Length;i++){
        if(j==0) printf("\n %4x0h ",(i/16));
        #if(DEBUG_ETHERNET_BUFFER==1)
            printf("%2x ",*pData);
        #endif    
        j++;
        pData++;
        if(j==16) j=0;
        //if(i>=0x60) break;
    }        
    #if(DEBUG_ETHERNET_BUFFER)
        printf("\n ");
    #endif 
}