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/* buffers.c */
#include "or.h"
int buf_new(char **pbuf, size_t *pbuflen, size_t *pbuf_datalen) {
if (!pbuf || !pbuflen || !pbuf_datalen) /* invalid parameters */
return -1;
*pbuf = (char *)malloc(MAX_BUF_SIZE);
if(!*pbuf)
return -1;
memset(*pbuf,0,MAX_BUF_SIZE);
*pbuflen = MAX_BUF_SIZE;
*pbuf_datalen = 0;
return 0;
}
int buf_free(char *buf) {
free(buf);
return 0;
}
int read_to_buf(int s, char **pbuf, size_t *pbuflen, size_t *pbuf_datalen, int *preached_eof) {
/* grab from s, put onto buf, return how many bytes read */
int read_result;
char *buf;
size_t buflen;
size_t buf_datalen;
if (!pbuf || !pbuflen || !pbuf_datalen || !preached_eof) /* invalid parameters */
return -1 ;
if(s<0) {
log(LOG_DEBUG,"read_to_buf() received negative socket %d.",s);
return -1;
}
/* this is the point where you would grow the buffer, if you want to */
buf = *pbuf, buflen = *pbuflen, buf_datalen = *pbuf_datalen;
if (!buf) /* invalid parameter */
return -1;
read_result = read(s, buf+buf_datalen, buflen - buf_datalen);
if (read_result < 0) {
if(errno!=EAGAIN) { /* it's a real error */
return -1;
}
return 0;
} else if (read_result == 0) {
log(LOG_DEBUG,"read_to_buf(): Encountered eof");
*preached_eof = 1;
return 0;
} else { /* we read some bytes */
*pbuf_datalen = buf_datalen + read_result;
log(LOG_DEBUG,"read_to_buf(): Read %d bytes. %d on inbuf.",read_result, *pbuf_datalen);
return read_result;
}
}
int flush_buf(int s, char **pbuf, size_t *pbuflen, size_t *pbuf_datalen) {
/* push from buf onto s
* then memmove to front of buf
* return -1 or how many bytes remain on the buf */
int write_result;
char *buf;
size_t buflen;
size_t buf_datalen;
if (!pbuf || !pbuflen || !pbuf_datalen) /* invalid parameters */
return -1;
if(s<0) {
log(LOG_DEBUG,"flush_buf() received negative socket %d.",s);
return -1;
}
if(*pbuf_datalen == 0) /* nothing to flush */
return 0;
/* this is the point where you would grow the buffer, if you want to */
buf = *pbuf, buflen = *pbuflen, buf_datalen = *pbuf_datalen;
if (!buf) /* invalid parameter */
return -1;
write_result = write(s, buf, buf_datalen);
if (write_result < 0) {
if(errno!=EAGAIN) { /* it's a real error */
return -1;
}
log(LOG_DEBUG,"flush_buf(): write() would block, returning.");
return 0;
} else {
*pbuf_datalen -= write_result;
memmove(buf, buf+write_result, *pbuf_datalen);
log(LOG_DEBUG,"flush_buf(): flushed %d bytes, %d remain.",write_result,*pbuf_datalen);
return *pbuf_datalen;
}
}
int write_to_buf(char *string, size_t string_len,
char **pbuf, size_t *pbuflen, size_t *pbuf_datalen) {
/* append string to buf (growing as needed, return -1 if "too big")
* return total number of bytes on the buf
*/
char *buf;
size_t buflen;
size_t buf_datalen;
if (!string || !pbuf || !pbuflen || !pbuf_datalen) /* invalid parameters */
return -1;
/* this is the point where you would grow the buffer, if you want to */
buf = *pbuf, buflen = *pbuflen, buf_datalen = *pbuf_datalen;
if (!buf) /* invalid parameter */
return -1;
if (string_len + buf_datalen > buflen) { /* we're out of luck */
log(LOG_DEBUG, "write_to_buf(): buflen too small. Time to implement growing dynamic bufs.");
return -1;
}
memcpy(buf+buf_datalen, string, string_len);
*pbuf_datalen += string_len;
log(LOG_DEBUG,"write_to_buf(): added %d bytes to buf (now %d total).",string_len, *pbuf_datalen);
return *pbuf_datalen;
}
int fetch_from_buf(char *string, size_t string_len,
char **pbuf, size_t *pbuflen, size_t *pbuf_datalen) {
/* if there is string_len bytes in buf, write them onto string,
* then memmove buf back (that is, remove them from buf) */
char *buf;
size_t buflen;
size_t buf_datalen;
if (!string || !pbuf || !pbuflen || !pbuf_datalen) /* invalid parameters */
return -1;
/* this is the point where you would grow the buffer, if you want to */
buf = *pbuf, buflen = *pbuflen, buf_datalen = *pbuf_datalen;
if (!buf) /* invalid parameter */
return -1;
if(string_len > buf_datalen) /* we want too much. sorry. */
return -1;
memcpy(string,buf,string_len);
*pbuf_datalen -= string_len;
memmove(buf, buf+string_len, *pbuf_datalen);
return *pbuf_datalen;
}
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