/**
* 读取变长的32位int变量
*
* @param input
* @return
*/
public static int readRawVarint32(SocketReadBuffer input)
{
byte tmp = input.readByte();
if ((tmp & 0x80) == 0)
{
return(tmp);
}
int result = tmp & 0x7f;
tmp = input.readByte();
if ((tmp & 0x80) == 0)
{
result |= tmp << 7;
}
else
{
result |= (tmp & 0x7f) << 7;
tmp = input.readByte();
if ((tmp & 0x80) == 0)
{
result |= tmp << 14;
}
else
{
result |= (tmp & 0x7f) << 14;
tmp = input.readByte();
if ((tmp & 0x80) == 0)
{
result |= tmp << 21;
}
else
{
result |= (tmp & 0x7f) << 21;
tmp = input.readByte();
result |= tmp << 28;
if ((tmp & 0x80) != 0)
{
// Discard upper 32 bits.
for (int i = 0; i < 5; i++)
{
if ((input.readByte() & 0x80) == 0)
{
return(result);
}
}
// throw
// InvalidProtocolBufferException.malformedVarint();
}
}
}
}
return(result);
}
/**
* 有符号int读取,变长
*
* @param input
* @return
*/
public static int readSInt(SocketReadBuffer input)
{
return(decodeZigZag32(readRawVarint32(input)));
}
