NXStream *NXOpenMemory(const char *addr, int size, int mode)
{
NXStream *s;
int newMode = mode;
if ((int)addr % vm_page_size && (mode != NX_READONLY))
return 0;
s = NXStreamCreate(newMode, FALSE);
s->functions = &memory_functions;
s->buf_base = (unsigned char *)addr;
s->buf_size = size;
s->buf_left = size;
s->buf_ptr = (unsigned char *)addr;
s->eof = size;
s->flags |= NX_CANSEEK;
if (addr)
s->flags |= NX_USER_OWNS_BUF;
else
switch(mode) {
case NX_READONLY:
break;
case NX_WRITEONLY:
memory_flush(s); /* get initial buffer */
break;
case NX_READWRITE:
if (s->flags & NX_READFLAG) {
NXChangeBuffer(s);
memory_flush(s); /* get initial buffer */
}
break;
}
return (s);
}
NXStream *NXOpenFile(int fd, int mode)
{
NXStream *s;
struct file_info *fi;
struct stat statInfo;
if (fstat(fd, &statInfo) == -1)
return NULL;
s = NXStreamCreate(mode, TRUE);
s->functions = &file_functions;
fi = (struct file_info *) malloc(sizeof(struct file_info));
fi->fd = fd;
s->info = (char *)fi;
s->eof = statInfo.st_size;
/*
* Stream is only seekable if it's not a socket or a pipe.
*/
if ( (statInfo.st_mode&S_IFMT) != S_IFSOCK
&& (statInfo.st_mode&S_IFMT) != S_IFIFO)
s->flags |= NX_CANSEEK;
return s;
}
/*
* NXOpenPort:
*
* open a stream using a ipc descriptor.
*/
NXStream *
NXOpenPort(mach_port_t port, int mode)
{
#ifdef notyet
NXStream *s;
InlineMsg *msg;
/*??? set the flags */
if (mode == NX_READWRITE)
return NULL;
s = NXStreamCreate(mode, FALSE);
s->functions = &ipc_functions;
msg = (InlineMsg *)malloc(sizeof(InlineMsg));
s->info = (char *)msg;
if (mode == NX_READONLY) {
msg->header.msg_local_port = port;
s->buf_left = 0;
} else {
msg->header.msg_simple = TRUE;
msg->header.msg_type = MSG_TYPE_NORMAL;
msg->header.msg_local_port = PORT_NULL;
msg->header.msg_remote_port = port;
msg->type.msg_type_header.msg_type_inline = TRUE;
msg->type.msg_type_header.msg_type_longform = TRUE;
msg->type.msg_type_header.msg_type_deallocate = FALSE;
msg->type.msg_type_long_name = MSG_TYPE_CHAR;
msg->type.msg_type_long_size = 8;
s->buf_left = BUFSIZE;
}
s->buf_base = s->buf_ptr = msg->data;
s->buf_size = BUFSIZE;
s->flags &= ~NX_CANSEEK;
return s;
#else
return NULL;
#endif
}
NXStream *NXOpenSmallMemory(int mode){
NXStream *s;
int newMode = mode;
char *addr;
if (mode != NX_WRITEONLY && mode != NX_READWRITE)
return NULL;
addr = malloc(INITIAL_SIZE);
s = NXStreamCreate(newMode, FALSE);
s->functions = &cheap_functions;
s->buf_base = (unsigned char *)addr;
s->buf_size = INITIAL_SIZE;
s->buf_left = INITIAL_SIZE;
s->buf_ptr = (unsigned char *)addr;
s->eof = 0;
s->flags |= NX_CANSEEK;
switch(mode) {
case NX_READWRITE:
if (s->flags & NX_READFLAG) {
NXChangeBuffer(s);
}
break;
}
return (s);
}
