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#include "./bufio.h"
#ifndef WINDOWS
#include <unistd.h>
#include <stdio.h> // autoconf manual: Darwin + others prereq for stdlib.h
#include <stdlib.h> // autoconf manual: Darwin prereq for sys/socket.h
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#endif
#include <string.h>
#include <errno.h>
#include "btrequest.h"
#define _left_buffer_size (n - p)
BufIo::BufIo()
{
f_socket_remote_closed = 0;
b = new char[BUF_DEF_SIZ];
#ifndef WINDOWS
if( !b ) throw 9;
#endif
p = 0;
n = BUF_DEF_SIZ;
}
ssize_t BufIo::_realloc_buffer()
{
return SetSize(n + BUF_INC_SIZ);
}
ssize_t BufIo::SetSize(size_t len)
{
char *tbuf;
if( len > BUF_MAX_SIZ ) return -1; // buffer too long
if( p > len) len = p;
if( len == n ) return 0;
tbuf = new char[len];
#ifndef WINDOWS
if( !tbuf ) return -1;
#endif
if(p) memcpy(tbuf, b, p);
delete []b;
b = tbuf;
n = len;
return 0;
}
// retval
// successful return bytes sended. otherwise -1;
ssize_t BufIo::_SEND(SOCKET sk, char *buf, size_t len)
{
ssize_t r;
size_t t = 0;
for(; len;){
r = SEND(sk,buf,len);
if(r < 0){
#ifndef WINDOWS
if(errno == EINTR) continue;
#endif
return (EWOULDBLOCK == errno || EAGAIN == errno) ? (ssize_t)t : -1;
}else if( 0 == r ){
return (ssize_t)t; // no possible???
}else{
buf += r;
len -= r;
t += r;
}
}
return (ssize_t)t;
}
ssize_t BufIo::_RECV(SOCKET sk, char *buf,size_t len)
{
ssize_t r;
size_t t = 0;
for(; len;){
r = RECV(sk,(char*)buf,len);
if(r < 0){
#ifndef WINDOWS
if(errno == EINTR) continue;
#endif
return (EWOULDBLOCK == errno || EAGAIN == errno) ? (ssize_t)t : -1;
}else if( 0 == r ){
f_socket_remote_closed = 1;
return (ssize_t)t; //connection closed by remote.
}else{
buf += r;
len -= r;
t += r;
}
}
return (ssize_t)t;
}
ssize_t BufIo::Put(SOCKET sk, char *buf,size_t len)
{
ssize_t r;
if( _left_buffer_size < len ){ //no enough space
r = FlushOut(sk);
if( r < 0 ) return r;
for( ; _left_buffer_size < len; ) // still no enough space
if(_realloc_buffer() < 0) return -3;
}
memcpy(b + p, buf, len);
p += len;
return 0;
}
ssize_t BufIo::FeedIn(SOCKET sk)
{
return FeedIn(sk, _left_buffer_size);
}
ssize_t BufIo::FeedIn(SOCKET sk, size_t limit)
{
ssize_t r;
if(!_left_buffer_size)
if(_realloc_buffer() < 0) return (ssize_t) -2;
if( 0==limit || limit > _left_buffer_size ) limit = _left_buffer_size;
r = _RECV(sk, b + p, limit);
if( r < 0 ) return -1;
else{
if( r ) p += r;
if( f_socket_remote_closed ) return -2; // connection closed by remote
}
return (ssize_t) p;
}
ssize_t BufIo::PutFlush(SOCKET sk, char *buf,size_t len)
{
if( _left_buffer_size < len && p){
if( FlushOut(sk) < 0) return -1;
}
for(; _left_buffer_size < len; )
if( _realloc_buffer() < 0) return -3;
memcpy(b + p, buf, len);
p += len;
return FlushOut(sk);
}
// retval
// >= 0 left bytes in buffer
// < 0 failed
ssize_t BufIo::FlushOut(SOCKET sk)
{
ssize_t r;
if( !p ) return 0; // no data to be send
r = _SEND(sk,b,p);
if( r < 0 ) return r;
else if( r > 0){
p -= r;
if( p ) memmove(b, b + r, p);
}
return (ssize_t)p;
}
ssize_t BufIo::PickUp(size_t len)
{
if( p < len ) return -1;
p -= len;
if( p ) memmove(b, b + len, p);
return 0;
}
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