GNUnet 0.21.1
crypto_hash_file.c
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1/*
2 This file is part of GNUnet.
3 Copyright (C) 2001-2013 GNUnet e.V.
4
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
9
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 Affero General Public License for more details.
14
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17
18 SPDX-License-Identifier: AGPL3.0-or-later
19
20 */
27#include "platform.h"
28#include "gnunet_util_lib.h"
29#include <gcrypt.h>
30
31#define LOG(kind, ...) GNUNET_log_from (kind, "util-crypto-hash-file", \
32 __VA_ARGS__)
33
34#define LOG_STRERROR_FILE(kind, syscall, \
35 filename) GNUNET_log_from_strerror_file (kind, \
36 "util-crypto-hash-file", \
37 syscall, \
38 filename)
39
40
45{
50
55
59 unsigned char *buffer;
60
64 char *filename;
65
70
74 gcry_md_hd_t md;
75
79 uint64_t fsize;
80
84 uint64_t offset;
85
90
95
99 size_t bsize;
100};
101
102
107static void
109 const struct GNUNET_HashCode *res)
110{
111 fhc->callback (fhc->callback_cls, res);
112 GNUNET_free (fhc->filename);
113 if (! GNUNET_DISK_handle_invalid (fhc->fh))
115 gcry_md_close (fhc->md);
116 GNUNET_free (fhc); /* also frees fhc->buffer */
117}
118
119
125static void
126file_hash_task (void *cls)
127{
128 struct GNUNET_CRYPTO_FileHashContext *fhc = cls;
129 struct GNUNET_HashCode *res;
130 size_t delta;
131 ssize_t sret;
132
133 fhc->task = NULL;
134 GNUNET_assert (fhc->offset <= fhc->fsize);
135 delta = fhc->bsize;
136 if (fhc->fsize - fhc->offset < delta)
137 delta = fhc->fsize - fhc->offset;
138 sret = GNUNET_DISK_file_read (fhc->fh,
139 fhc->buffer,
140 delta);
141 if ((sret < 0) ||
142 (delta != (size_t) sret))
143 {
145 "read",
146 fhc->filename);
147 file_hash_finish (fhc,
148 NULL);
149 return;
150 }
151 gcry_md_write (fhc->md,
152 fhc->buffer,
153 delta);
154 fhc->offset += delta;
155 if (fhc->offset == fhc->fsize)
156 {
157 res = (struct GNUNET_HashCode *) gcry_md_read (fhc->md,
158 GCRY_MD_SHA512);
159 file_hash_finish (fhc, res);
160 return;
161 }
164 fhc);
165}
166
167
170 const char *filename,
171 size_t blocksize,
173 void *callback_cls)
174{
176
177 GNUNET_assert (blocksize > 0);
178 fhc =
179 GNUNET_malloc (sizeof(struct GNUNET_CRYPTO_FileHashContext) + blocksize);
180 fhc->callback = callback;
182 fhc->buffer = (unsigned char *) &fhc[1];
184 if (GPG_ERR_NO_ERROR != gcry_md_open (&fhc->md, GCRY_MD_SHA512, 0))
185 {
186 GNUNET_break (0);
187 GNUNET_free (fhc->filename);
188 GNUNET_free (fhc);
189 return NULL;
190 }
191 fhc->bsize = blocksize;
192 if (GNUNET_OK !=
194 &fhc->fsize,
195 GNUNET_NO,
196 GNUNET_YES))
197 {
198 GNUNET_free (fhc->filename);
199 GNUNET_free (fhc);
200 return NULL;
201 }
205 if (! fhc->fh)
206 {
207 GNUNET_free (fhc->filename);
208 GNUNET_free (fhc);
209 return NULL;
210 }
211 fhc->priority = priority;
214 fhc);
215 return fhc;
216}
217
218
224void
226{
228 GNUNET_free (fhc->filename);
231 gcry_md_close (fhc->md);
232 GNUNET_free (fhc);
233}
234
235
236/* end of crypto_hash_file.c */
static void file_hash_task(void *cls)
File hashing task.
static void file_hash_finish(struct GNUNET_CRYPTO_FileHashContext *fhc, const struct GNUNET_HashCode *res)
Report result of hash computation to callback and free associated resources.
#define LOG_STRERROR_FILE(kind, syscall, filename)
static char * filename
static char * res
Currently read line or NULL on EOF.
struct GNUNET_DISK_FileHandle * GNUNET_DISK_file_open(const char *fn, enum GNUNET_DISK_OpenFlags flags, enum GNUNET_DISK_AccessPermissions perm)
Open a file.
Definition: disk.c:1237
enum GNUNET_GenericReturnValue GNUNET_DISK_file_size(const char *filename, uint64_t *size, int include_symbolic_links, int single_file_mode)
Get the size of the file (or directory) of the given file (in bytes).
Definition: disk.c:221
enum GNUNET_GenericReturnValue GNUNET_DISK_handle_invalid(const struct GNUNET_DISK_FileHandle *h)
Checks whether a handle is invalid.
Definition: disk.c:185
enum GNUNET_GenericReturnValue GNUNET_DISK_file_close(struct GNUNET_DISK_FileHandle *h)
Close an open file.
Definition: disk.c:1308
ssize_t GNUNET_DISK_file_read(const struct GNUNET_DISK_FileHandle *h, void *result, size_t len)
Read the contents of a binary file into a buffer.
Definition: disk.c:622
@ GNUNET_DISK_OPEN_READ
Open the file for reading.
@ GNUNET_DISK_PERM_NONE
Nobody is allowed to do anything to the file.
struct GNUNET_CRYPTO_FileHashContext * GNUNET_CRYPTO_hash_file(enum GNUNET_SCHEDULER_Priority priority, const char *filename, size_t blocksize, GNUNET_CRYPTO_HashCompletedCallback callback, void *callback_cls)
Compute the hash of an entire file.
void(* GNUNET_CRYPTO_HashCompletedCallback)(void *cls, const struct GNUNET_HashCode *res)
Function called once the hash computation over the specified file has completed.
void GNUNET_CRYPTO_hash_file_cancel(struct GNUNET_CRYPTO_FileHashContext *fhc)
Cancel a file hashing operation.
GNUNET_SCHEDULER_Priority
Valid task priorities.
@ GNUNET_OK
@ GNUNET_YES
@ GNUNET_NO
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur.
@ GNUNET_ERROR_TYPE_WARNING
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
#define GNUNET_malloc(size)
Wrapper around malloc.
#define GNUNET_free(ptr)
Wrapper around free.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:981
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_with_priority(enum GNUNET_SCHEDULER_Priority prio, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified priority.
Definition: scheduler.c:1232
static struct GNUNET_TIME_Relative delta
Definition: speedup.c:36
Context used when hashing a file.
uint64_t fsize
Size of the file.
gcry_md_hd_t md
Cummulated hash.
unsigned char * buffer
IO buffer.
GNUNET_CRYPTO_HashCompletedCallback callback
Function to call upon completion.
struct GNUNET_DISK_FileHandle * fh
File descriptor.
void * callback_cls
Closure for callback.
uint64_t offset
Current offset.
struct GNUNET_SCHEDULER_Task * task
Current task for hashing.
char * filename
Name of the file we are hashing.
enum GNUNET_SCHEDULER_Priority priority
Priority we use.
Handle used to access files (and pipes).
A 512-bit hashcode.
Entry in list of pending tasks.
Definition: scheduler.c:136