/*
This file is part of GNUnet.
- (C) 2006, 2009 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2006, 2009, 2013 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
*/
/**
* @file util/bio.c
#define LOG(kind,...) GNUNET_log_from (kind, "util",__VA_ARGS__)
+/**
+ * Size for I/O buffers.
+ */
#define BIO_BUFFER_SIZE 65536
+/**
+ * Maximum size allowed for meta data written/read from disk.
+ * File-sharing limits to 64k, so this should be rather generous.
+ */
#define MAX_META_DATA (1024 * 1024)
+
/**
* Handle for buffered reading.
*/
struct GNUNET_BIO_ReadHandle
{
+ /**
+ * Underlying file abstraction.
+ */
struct GNUNET_DISK_FileHandle *fd;
+
+ /**
+ * Error message, NULL if there were no errors.
+ */
char *emsg;
+
+ /**
+ * I/O buffer. Allocated at the end of the struct, do not free!
+ */
char *buffer;
+
+ /**
+ * Number of bytes available in read @e buffer.
+ */
size_t have;
+
+ /**
+ * Total size of @e buffer.
+ */
size_t size;
+
+ /**
+ * Current read offset in @e buffer.
+ */
off_t pos;
};
* @return #GNUNET_OK on success, #GNUNET_SYSERR otherwise
*/
int
-GNUNET_BIO_read_close (struct GNUNET_BIO_ReadHandle *h, char **emsg)
+GNUNET_BIO_read_close (struct GNUNET_BIO_ReadHandle *h,
+ char **emsg)
{
int err;
* @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
*/
int
-GNUNET_BIO_read (struct GNUNET_BIO_ReadHandle *h, const char *what,
+GNUNET_BIO_read (struct GNUNET_BIO_ReadHandle *h,
+ const char *what,
void *result, size_t len)
{
char *dst = result;
{
if (min > len - pos)
min = len - pos;
- memcpy (&dst[pos], &h->buffer[h->pos], min);
+ GNUNET_memcpy (&dst[pos], &h->buffer[h->pos], min);
h->pos += min;
pos += min;
}
if (0 == ret)
{
GNUNET_asprintf (&h->emsg,
- _("Error reading `%s': %s"),
+ _("Error reading `%s': %s"),
what,
_("End of file"));
return GNUNET_SYSERR;
* @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
*/
int
-GNUNET_BIO_read_fn (struct GNUNET_BIO_ReadHandle *h, const char *file, int line,
- void *result, size_t len)
+GNUNET_BIO_read_fn (struct GNUNET_BIO_ReadHandle *h,
+ const char *file,
+ int line,
+ void *result,
+ size_t len)
{
char what[1024];
* @param what describes what is being read (for error message creation)
* @param result the buffer to store a pointer to the (allocated) string to
* (note that *result could be set to NULL as well)
- * @param maxLen maximum allowed length for the string
+ * @param max_length maximum allowed length for the string
* @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
*/
int
-GNUNET_BIO_read_string (struct GNUNET_BIO_ReadHandle *h, const char *what,
- char **result, size_t maxLen)
+GNUNET_BIO_read_string (struct GNUNET_BIO_ReadHandle *h,
+ const char *what,
+ char **result,
+ size_t max_length)
{
char *buf;
uint32_t big;
*result = NULL;
return GNUNET_OK;
}
- if (big > maxLen)
+ if (big > max_length)
{
GNUNET_asprintf (&h->emsg, _("String `%s' longer than allowed (%u > %u)"),
- what, big, maxLen);
+ what, big, max_length);
return GNUNET_SYSERR;
}
buf = GNUNET_malloc (big);
* @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
*/
int
-GNUNET_BIO_read_meta_data (struct GNUNET_BIO_ReadHandle *h, const char *what,
+GNUNET_BIO_read_meta_data (struct GNUNET_BIO_ReadHandle *h,
+ const char *what,
struct GNUNET_CONTAINER_MetaData **result)
{
uint32_t size;
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
int
-GNUNET_BIO_read_int64__ (struct GNUNET_BIO_ReadHandle *h, const char *file,
- int line, int64_t * i)
+GNUNET_BIO_read_int64__ (struct GNUNET_BIO_ReadHandle *h,
+ const char *file,
+ int line,
+ int64_t *i)
{
int64_t big;
*/
struct GNUNET_BIO_WriteHandle
{
+ /**
+ * Underlying file handle.
+ */
struct GNUNET_DISK_FileHandle *fd;
+
+ /**
+ * I/O buffer. Do not free, allocated at the end of the struct.
+ */
char *buffer;
+
+ /**
+ * Number of bytes already in @e buffer.
+ */
size_t have;
+
+ /**
+ * Total size of @e buffer.
+ */
size_t size;
};
min = h->size - h->have;
if (min > n - pos)
min = n - pos;
- memcpy (&h->buffer[h->have], &src[pos], min);
+ GNUNET_memcpy (&h->buffer[h->have], &src[pos], min);
pos += min;
h->have += min;
if (pos == n)
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
int
-GNUNET_BIO_write_string (struct GNUNET_BIO_WriteHandle *h,
+GNUNET_BIO_write_string (struct GNUNET_BIO_WriteHandle *h,
const char *s)
{
uint32_t slen;
*
* @param h hande to open file
* @param i 32-bit integer to write
- * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
int
-GNUNET_BIO_write_int32 (struct GNUNET_BIO_WriteHandle *h, int32_t i)
+GNUNET_BIO_write_int32 (struct GNUNET_BIO_WriteHandle *h,
+ int32_t i)
{
int32_t big;
*
* @param h hande to open file
* @param i 64-bit integer to write
- * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
int
-GNUNET_BIO_write_int64 (struct GNUNET_BIO_WriteHandle *h, int64_t i)
+GNUNET_BIO_write_int64 (struct GNUNET_BIO_WriteHandle *h,
+ int64_t i)
{
int64_t big;