Audiovox P965 Datový list stáhnout pdf (Strana 223)

API in C

220

* Encode message length and write it out to the socket

********************************************************************/

void writeLen(int fdSock, int iLen)

{

char *cEncodedLength; // encoded length to send to the api socket

char *cLength; // exactly what is in memory at &iLen integer

cLength = calloc(sizeof(int), 1);

cEncodedLength = calloc(sizeof(int), 1);

// set cLength address to be same as iLen

cLength = (char *)&iLen;

DEBUG ? printf("length of word is %d\n", iLen) : 0;

// write 1 byte

if (iLen < 0x80)

{

cEncodedLength[0] = (char)iLen;

write (fdSock, cEncodedLength, 1);

}

// write 2 bytes

else if (iLen < 0x4000)

{

DEBUG ? printf("iLen < 0x4000.\n") : 0;

if (iLittleEndian)

{

cEncodedLength[0] = cLength[1] | 0x80;

cEncodedLength[1] = cLength[0];

}

else

{

cEncodedLength[0] = cLength[2] | 0x80;

cEncodedLength[1] = cLength[3];

}

write (fdSock, cEncodedLength, 2);

}

// write 3 bytes

else if (iLen < 0x200000)

{

DEBUG ? printf("iLen < 0x200000.\n") : 0;

if (iLittleEndian)

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Audiovox P965 Datový list Strana 223