2 This file is part of GNUnet.
3 (C) 2006, 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @brief functions for buffering IO
23 * @author Christian Grothoff
26 #include "gnunet_bio_lib.h"
27 #include "gnunet_disk_lib.h"
29 #define LOG(kind,...) GNUNET_log_from (kind, "util",__VA_ARGS__)
31 #define BIO_BUFFER_SIZE 65536
33 #define MAX_META_DATA (1024 * 1024)
36 * Handle for buffered reading.
38 struct GNUNET_BIO_ReadHandle
40 struct GNUNET_DISK_FileHandle *fd;
50 * Open a file for reading.
52 * @param fn file name to be opened
53 * @return IO handle on success, NULL on error
55 struct GNUNET_BIO_ReadHandle *
56 GNUNET_BIO_read_open (const char *fn)
58 struct GNUNET_DISK_FileHandle *fd;
59 struct GNUNET_BIO_ReadHandle *h;
62 GNUNET_DISK_file_open (fn, GNUNET_DISK_OPEN_READ, GNUNET_DISK_PERM_NONE);
65 h = GNUNET_malloc (sizeof (struct GNUNET_BIO_ReadHandle) + BIO_BUFFER_SIZE);
66 h->buffer = (char *) &h[1];
67 h->size = BIO_BUFFER_SIZE;
74 * Close an open file. Reports if any errors reading
75 * from the file were encountered.
77 * @param h file handle
78 * @param emsg set to the error message
79 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
82 GNUNET_BIO_read_close (struct GNUNET_BIO_ReadHandle *h, char **emsg)
86 err = (NULL == h->emsg) ? GNUNET_OK : GNUNET_SYSERR;
90 GNUNET_free_non_null (h->emsg);
91 GNUNET_DISK_file_close (h->fd);
98 * Read the contents of a binary file into a buffer.
100 * @param h handle to an open file
101 * @param what describes what is being read (for error message creation)
102 * @param result the buffer to write the result to
103 * @param len the number of bytes to read
104 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
107 GNUNET_BIO_read (struct GNUNET_BIO_ReadHandle *h, const char *what,
108 void *result, size_t len)
116 return GNUNET_SYSERR;
120 /* first, use buffer */
121 min = h->have - h->pos;
126 memcpy (&dst[pos], &h->buffer[h->pos], min);
131 return GNUNET_OK; /* done! */
132 GNUNET_assert (h->have == h->pos);
134 ret = GNUNET_DISK_file_read (h->fd, h->buffer, h->size);
137 GNUNET_asprintf (&h->emsg, _("Error reading `%s': %s"), what,
139 return GNUNET_SYSERR;
143 GNUNET_asprintf (&h->emsg, _("Error reading `%s': %s"), what,
145 return GNUNET_SYSERR;
150 while (pos < len); /* should always be true */
156 * Read the contents of a binary file into a buffer.
158 * @param h handle to an open file
159 * @param file name of the source file
160 * @param line line number in the source file
161 * @param result the buffer to write the result to
162 * @param len the number of bytes to read
163 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
166 GNUNET_BIO_read_fn (struct GNUNET_BIO_ReadHandle *h, const char *file,
167 int line, void *result, size_t len)
171 GNUNET_snprintf (what, sizeof (what), "%s:%d", file, line);
172 return GNUNET_BIO_read (h, what, result, len);
177 * Read 0-terminated string from a file.
179 * @param h handle to an open file
180 * @param what describes what is being read (for error message creation)
181 * @param result the buffer to store a pointer to the (allocated) string to
182 * (note that *result could be set to NULL as well)
183 * @param maxLen maximum allowed length for the string
184 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
187 GNUNET_BIO_read_string (struct GNUNET_BIO_ReadHandle *h, const char *what,
188 char **result, size_t maxLen)
193 if (GNUNET_OK != GNUNET_BIO_read_int32 (h, &big))
195 GNUNET_free_non_null (h->emsg);
196 GNUNET_asprintf (&h->emsg, _("Error reading length of string `%s'"),
198 return GNUNET_SYSERR;
207 GNUNET_asprintf (&h->emsg,
208 _("String `%s' longer than allowed (%u > %u)"), what,
210 return GNUNET_SYSERR;
212 buf = GNUNET_malloc (big);
217 if (GNUNET_OK != GNUNET_BIO_read (h, what, buf, big))
221 return GNUNET_SYSERR;
228 * Read metadata container from a file.
230 * @param h handle to an open file
231 * @param what describes what is being read (for error message creation)
232 * @param result the buffer to store a pointer to the (allocated) metadata
233 * @return GNUNET_OK on success, GNUNET_SYSERR on failure
236 GNUNET_BIO_read_meta_data (struct GNUNET_BIO_ReadHandle *h, const char *what,
237 struct GNUNET_CONTAINER_MetaData **result)
241 struct GNUNET_CONTAINER_MetaData *meta;
243 if (GNUNET_BIO_read_int32 (h, (int32_t *) & size) != GNUNET_OK)
244 return GNUNET_SYSERR;
250 if (size > MAX_META_DATA)
252 GNUNET_asprintf (&h->emsg,
254 ("Serialized metadata `%s' larger than allowed (%u>%u)"),
255 what, size, MAX_META_DATA);
256 return GNUNET_SYSERR;
258 buf = GNUNET_malloc (size);
259 if (GNUNET_OK != GNUNET_BIO_read (h, what, buf, size))
262 return GNUNET_SYSERR;
264 meta = GNUNET_CONTAINER_meta_data_deserialize (buf, size);
268 GNUNET_asprintf (&h->emsg, _("Metadata `%s' failed to deserialize"),
270 return GNUNET_SYSERR;
279 * Read an (u)int32_t.
281 * @param h hande to open file
282 * @param file name of the source file
283 * @param line line number in the source file
284 * @param i address of 32-bit integer to read
285 * @return GNUNET_OK on success, GNUNET_SYSERR on error
288 GNUNET_BIO_read_int32__ (struct GNUNET_BIO_ReadHandle *h, const char *file,
289 int line, int32_t * i)
293 if (GNUNET_OK != GNUNET_BIO_read_fn (h, file, line, &big, sizeof (int32_t)))
294 return GNUNET_SYSERR;
301 * Read an (u)int64_t.
303 * @param h hande to open file
304 * @param file name of the source file
305 * @param line line number in the source file
306 * @param i address of 64-bit integer to read
307 * @return GNUNET_OK on success, GNUNET_SYSERR on error
310 GNUNET_BIO_read_int64__ (struct GNUNET_BIO_ReadHandle *h, const char *file,
311 int line, int64_t * i)
315 if (GNUNET_OK != GNUNET_BIO_read_fn (h, file, line, &big, sizeof (int64_t)))
316 return GNUNET_SYSERR;
317 *i = GNUNET_ntohll (big);
323 * Handle for buffered writing.
325 struct GNUNET_BIO_WriteHandle
327 struct GNUNET_DISK_FileHandle *fd;
335 * Open a file for writing.
337 * @param fn file name to be opened
338 * @return IO handle on success, NULL on error
340 struct GNUNET_BIO_WriteHandle *
341 GNUNET_BIO_write_open (const char *fn)
343 struct GNUNET_DISK_FileHandle *fd;
344 struct GNUNET_BIO_WriteHandle *h;
346 fd = GNUNET_DISK_file_open (fn,
347 GNUNET_DISK_OPEN_WRITE |
348 GNUNET_DISK_OPEN_TRUNCATE |
349 GNUNET_DISK_OPEN_CREATE,
350 GNUNET_DISK_PERM_USER_READ |
351 GNUNET_DISK_PERM_USER_WRITE);
355 GNUNET_malloc (sizeof (struct GNUNET_BIO_WriteHandle) + BIO_BUFFER_SIZE);
356 h->buffer = (char *) &h[1];
357 h->size = BIO_BUFFER_SIZE;
365 * Close an open file for writing.
367 * @param h file handle
368 * @return GNUNET_OK on success, GNUNET_SYSERR otherwise
371 GNUNET_BIO_write_close (struct GNUNET_BIO_WriteHandle *h)
382 wrt = GNUNET_DISK_file_write (h->fd, h->buffer, h->have);
387 GNUNET_DISK_file_close (h->fd);
395 * Write a buffer to a file.
397 * @param h handle to open file
398 * @param buffer the data to write
399 * @param n number of bytes to write
400 * @return GNUNET_OK on success, GNUNET_SYSERR on error
403 GNUNET_BIO_write (struct GNUNET_BIO_WriteHandle *h, const void *buffer,
406 const char *src = buffer;
412 return GNUNET_SYSERR;
416 /* first, just use buffer */
417 min = h->size - h->have;
420 memcpy (&h->buffer[h->have], &src[pos], min);
424 return GNUNET_OK; /* done */
425 GNUNET_assert (h->have == h->size);
426 ret = GNUNET_DISK_file_write (h->fd, h->buffer, h->size);
429 GNUNET_DISK_file_close (h->fd);
431 return GNUNET_SYSERR; /* error */
435 while (pos < n); /* should always be true */
442 * Write a string to a file.
444 * @param h handle to open file
445 * @param s string to write (can be NULL)
446 * @return GNUNET_OK on success, GNUNET_SYSERR on error
449 GNUNET_BIO_write_string (struct GNUNET_BIO_WriteHandle *h, const char *s)
453 slen = (uint32_t) ((s == NULL) ? 0 : strlen (s) + 1);
454 if (GNUNET_OK != GNUNET_BIO_write_int32 (h, slen))
455 return GNUNET_SYSERR;
457 return GNUNET_BIO_write (h, s, slen - 1);
463 * Write metadata container to a file.
465 * @param h handle to open file
466 * @param m metadata to write
467 * @return GNUNET_OK on success, GNUNET_SYSERR on error
470 GNUNET_BIO_write_meta_data (struct GNUNET_BIO_WriteHandle *h,
471 const struct GNUNET_CONTAINER_MetaData *m)
477 return GNUNET_BIO_write_int32 (h, 0);
480 GNUNET_CONTAINER_meta_data_serialize (m, &buf, MAX_META_DATA,
481 GNUNET_CONTAINER_META_DATA_SERIALIZE_PART);
485 return GNUNET_SYSERR;
487 if ((GNUNET_OK != GNUNET_BIO_write_int32 (h, (uint32_t) size)) ||
488 (GNUNET_OK != GNUNET_BIO_write (h, buf, size)))
491 return GNUNET_SYSERR;
499 * Write an (u)int32_t.
501 * @param h hande to open file
502 * @param i address of 32-bit integer to write
503 * @return GNUNET_OK on success, GNUNET_SYSERR on error
506 GNUNET_BIO_write_int32 (struct GNUNET_BIO_WriteHandle *h, int32_t i)
511 return GNUNET_BIO_write (h, &big, sizeof (int32_t));
516 * Write an (u)int64_t.
518 * @param h hande to open file
519 * @param i address of 64-bit integer to write
520 * @return GNUNET_OK on success, GNUNET_SYSERR on error
523 GNUNET_BIO_write_int64 (struct GNUNET_BIO_WriteHandle *h, int64_t i)
527 big = GNUNET_htonll (i);
528 return GNUNET_BIO_write (h, &big, sizeof (int64_t));