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/* Copyright 2001,2002 Roger Dingledine, Matej Pfajfar. */
/* See LICENSE for licensing information */
/* $Id$ */
/* buffers.c */
#include "or.h"
extern or_options_t options; /* command-line and config-file options */
/* Create a new buf of size MAX_BUF_SIZE. Write a pointer to it
* into *buf, write MAX_BUF_SIZE into *buflen, and initialize
* *buf_datalen to 0. Return 0.
*/
int buf_new(char **buf, int *buflen, int *buf_datalen) {
assert(buf && buflen && buf_datalen);
*buf = (char *)tor_malloc(MAX_BUF_SIZE);
// memset(*buf,0,MAX_BUF_SIZE);
*buflen = MAX_BUF_SIZE;
*buf_datalen = 0;
return 0;
}
void buf_free(char *buf) {
free(buf);
}
/* read from socket s, writing onto buf+buf_datalen.
* read at most 'at_most' bytes, and in any case don't read more than will fit based on buflen.
* If read() returns 0, set *reached_eof to 1 and return 0. If you want to tear
* down the connection return -1, else return the number of bytes read.
*/
int read_to_buf(int s, int at_most, char **buf, int *buflen, int *buf_datalen, int *reached_eof) {
int read_result;
#ifdef MS_WINDOWS
int e;
#endif
assert(buf && *buf && buflen && buf_datalen && reached_eof && (s>=0));
/* this is the point where you would grow the buffer, if you want to */
if(at_most > *buflen - *buf_datalen)
at_most = *buflen - *buf_datalen; /* take the min of the two */
if(at_most == 0)
return 0; /* we shouldn't read anything */
// log_fn(LOG_DEBUG,"reading at most %d bytes.",at_most);
read_result = read(s, *buf+*buf_datalen, at_most);
if (read_result < 0) {
if(!ERRNO_EAGAIN(errno)) { /* it's a real error */
return -1;
}
#ifdef MS_WINDOWS
e = correct_socket_errno(s);
if(!ERRNO_EAGAIN(errno)) { /* no, it *is* a real error! */
return -1;
}
#endif
return 0;
} else if (read_result == 0) {
log_fn(LOG_DEBUG,"Encountered eof");
*reached_eof = 1;
return 0;
} else { /* we read some bytes */
*buf_datalen += read_result;
// log_fn(LOG_DEBUG,"Read %d bytes. %d on inbuf.",read_result, *buf_datalen);
return read_result;
}
}
int read_to_buf_tls(tor_tls *tls, int at_most, char **buf, int *buflen, int *buf_datalen) {
int r;
assert(tls && *buf && buflen && buf_datalen);
if (at_most > *buflen - *buf_datalen)
at_most = *buflen - *buf_datalen;
if (at_most == 0)
return 0;
r = tor_tls_read(tls, *buf+*buf_datalen, at_most);
if (r<0)
return r;
*buf_datalen += r;
return r;
}
int flush_buf(int s, char **buf, int *buflen, int *buf_flushlen, int *buf_datalen) {
/* push from buf onto s
* then memmove to front of buf
* return -1 or how many bytes remain to be flushed */
int write_result;
#ifdef MS_WINDOWS
int e;
#endif
assert(buf && *buf && buflen && buf_flushlen && buf_datalen && (s>=0) && (*buf_flushlen <= *buf_datalen));
if(*buf_flushlen == 0) /* nothing to flush */
return 0;
/* this is the point where you would grow the buffer, if you want to */
write_result = write(s, *buf, *buf_flushlen);
if (write_result < 0) {
if(!ERRNO_EAGAIN(errno)) { /* it's a real error */
return -1;
}
#ifdef MS_WINDOWS
e = correct_socket_errno(s);
if(!ERRNO_EAGAIN(errno)) { /* no, it *is* a real error! */
return -1;
}
#endif
log_fn(LOG_DEBUG,"write() would block, returning.");
return 0;
} else {
*buf_datalen -= write_result;
*buf_flushlen -= write_result;
memmove(*buf, *buf+write_result, *buf_datalen);
// log_fn(LOG_DEBUG,"flushed %d bytes, %d ready to flush, %d remain.",
// write_result,*buf_flushlen,*buf_datalen);
return *buf_flushlen;
/* XXX USE_TLS should change to return write_result like any sane function would */
}
}
int flush_buf_tls(tor_tls *tls, char **buf, int *buflen, int *buf_flushlen, int *buf_datalen)
{
int r;
assert(tls && *buf && buflen && buf_datalen);
/* we want to let tls write even if flushlen is zero, because it might
* have a partial record pending */
r = tor_tls_write(tls, *buf, *buf_flushlen);
if (r < 0) {
return r;
}
*buf_datalen -= r;
*buf_flushlen -= r;
memmove(*buf, *buf+r, *buf_datalen);
return r;
}
int write_to_buf(char *string, int string_len,
char **buf, int *buflen, int *buf_datalen) {
/* append string to buf (growing as needed, return -1 if "too big")
* return total number of bytes on the buf
*/
assert(string && buf && *buf && buflen && buf_datalen);
/* this is the point where you would grow the buffer, if you want to */
if (string_len + *buf_datalen > *buflen) { /* we're out of luck */
log_fn(LOG_DEBUG, "buflen too small. Time to implement growing dynamic bufs.");
return -1;
}
memcpy(*buf+*buf_datalen, string, string_len);
*buf_datalen += string_len;
// log_fn(LOG_DEBUG,"added %d bytes to buf (now %d total).",string_len, *buf_datalen);
return *buf_datalen;
}
int fetch_from_buf(char *string, int string_len,
char **buf, int *buflen, int *buf_datalen) {
/* There must be string_len bytes in buf; write them onto string,
* then memmove buf back (that is, remove them from buf).
*
* Return the number of bytes still on the buffer. */
assert(string && buf && *buf && buflen && buf_datalen);
assert(string_len <= *buf_datalen); /* make sure we don't ask for too much */
memcpy(string,*buf,string_len);
*buf_datalen -= string_len;
memmove(*buf, *buf+string_len, *buf_datalen);
return *buf_datalen;
}
int find_on_inbuf(char *string, int string_len,
char *buf, int buf_datalen) {
/* find first instance of needle 'string' on haystack 'buf'. return how
* many bytes from the beginning of buf to the end of string.
* If it's not there, return -1.
*/
char *location;
char *last_possible = buf + buf_datalen - string_len;
assert(string && string_len > 0 && buf);
if(buf_datalen < string_len)
return -1;
for(location = buf; location <= last_possible; location++)
if((*location == *string) && !memcmp(location+1, string+1, string_len-1))
return location-buf+string_len;
return -1;
}
/*
Local Variables:
mode:c
indent-tabs-mode:nil
c-basic-offset:2
End:
*/
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