adding --enable-taler-wallet configure option to build a reduced version of libgnunetutil with only the parts needed by GNU Taler wallets

1 files changed, 215 insertions, 0 deletions

diff --git a/src/util/crypto_hash_file.c b/src/util/crypto_hash_file.c
new file mode 100644
index 000000000..2d15fac36
--- /dev/null
+++ b/src/util/crypto_hash_file.c
@@ -0,0 +1,215 @@
+/*
+     This file is part of GNUnet.
+     Copyright (C) 2001-2013 Christian Grothoff (and other contributing authors)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 3, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     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.
+
+*/
+
+/**
+ * @file util/crypto_hash_file.c
+ * @brief incremental hashing of files
+ * @author Christian Grothoff
+ */
+
+
+/**
+ * Context used when hashing a file.
+ */
+struct GNUNET_CRYPTO_FileHashContext
+{
+
+  /**
+   * Function to call upon completion.
+   */
+  GNUNET_CRYPTO_HashCompletedCallback callback;
+
+  /**
+   * Closure for callback.
+   */
+  void *callback_cls;
+
+  /**
+   * IO buffer.
+   */
+  unsigned char *buffer;
+
+  /**
+   * Name of the file we are hashing.
+   */
+  char *filename;
+
+  /**
+   * File descriptor.
+   */
+  struct GNUNET_DISK_FileHandle *fh;
+
+  /**
+   * Cummulated hash.
+   */
+  gcry_md_hd_t md;
+
+  /**
+   * Size of the file.
+   */
+  uint64_t fsize;
+
+  /**
+   * Current offset.
+   */
+  uint64_t offset;
+
+  /**
+   * Current task for hashing.
+   */
+  struct GNUNET_SCHEDULER_Task * task;
+
+  /**
+   * Priority we use.
+   */
+  enum GNUNET_SCHEDULER_Priority priority;
+
+  /**
+   * Blocksize.
+   */
+  size_t bsize;
+
+};
+
+
+/**
+ * Report result of hash computation to callback
+ * and free associated resources.
+ */
+static void
+file_hash_finish (struct GNUNET_CRYPTO_FileHashContext *fhc,
+                  const struct GNUNET_HashCode * res)
+{
+  fhc->callback (fhc->callback_cls, res);
+  GNUNET_free (fhc->filename);
+  if (!GNUNET_DISK_handle_invalid (fhc->fh))
+    GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fhc->fh));
+  gcry_md_close (fhc->md);
+  GNUNET_free (fhc);            /* also frees fhc->buffer */
+}
+
+
+/**
+ * File hashing task.
+ *
+ * @param cls closure
+ * @param tc context
+ */
+static void
+file_hash_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+  struct GNUNET_CRYPTO_FileHashContext *fhc = cls;
+  struct GNUNET_HashCode *res;
+  size_t delta;
+
+  fhc->task = NULL;
+  GNUNET_assert (fhc->offset <= fhc->fsize);
+  delta = fhc->bsize;
+  if (fhc->fsize - fhc->offset < delta)
+    delta = fhc->fsize - fhc->offset;
+  if (delta != GNUNET_DISK_file_read (fhc->fh, fhc->buffer, delta))
+  {
+    LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_WARNING, "read", fhc->filename);
+    file_hash_finish (fhc, NULL);
+    return;
+  }
+  gcry_md_write (fhc->md, fhc->buffer, delta);
+  fhc->offset += delta;
+  if (fhc->offset == fhc->fsize)
+  {
+    res = (struct GNUNET_HashCode *) gcry_md_read (fhc->md, GCRY_MD_SHA512);
+    file_hash_finish (fhc, res);
+    return;
+  }
+  fhc->task = GNUNET_SCHEDULER_add_with_priority (fhc->priority,
+                                                  &file_hash_task, fhc);
+}
+
+
+/**
+ * Compute the hash of an entire file.
+ *
+ * @param priority scheduling priority to use
+ * @param filename name of file to hash
+ * @param blocksize number of bytes to process in one task
+ * @param callback function to call upon completion
+ * @param callback_cls closure for callback
+ * @return NULL on (immediate) errror
+ */
+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)
+{
+  struct GNUNET_CRYPTO_FileHashContext *fhc;
+
+  GNUNET_assert (blocksize > 0);
+  fhc =
+      GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_FileHashContext) + blocksize);
+  fhc->callback = callback;
+  fhc->callback_cls = callback_cls;
+  fhc->buffer = (unsigned char *) &fhc[1];
+  fhc->filename = GNUNET_strdup (filename);
+  if (GPG_ERR_NO_ERROR != gcry_md_open (&fhc->md, GCRY_MD_SHA512, 0))
+  {
+    GNUNET_break (0);
+    GNUNET_free (fhc);
+    return NULL;
+  }
+  fhc->bsize = blocksize;
+  if (GNUNET_OK != GNUNET_DISK_file_size (filename, &fhc->fsize, GNUNET_NO, GNUNET_YES))
+  {
+    GNUNET_free (fhc->filename);
+    GNUNET_free (fhc);
+    return NULL;
+  }
+  fhc->fh =
+      GNUNET_DISK_file_open (filename, GNUNET_DISK_OPEN_READ,
+                             GNUNET_DISK_PERM_NONE);
+  if (!fhc->fh)
+  {
+    GNUNET_free (fhc->filename);
+    GNUNET_free (fhc);
+    return NULL;
+  }
+  fhc->priority = priority;
+  fhc->task =
+      GNUNET_SCHEDULER_add_with_priority (priority, &file_hash_task, fhc);
+  return fhc;
+}
+
+
+/**
+ * Cancel a file hashing operation.
+ *
+ * @param fhc operation to cancel (callback must not yet have been invoked)
+ */
+void
+GNUNET_CRYPTO_hash_file_cancel (struct GNUNET_CRYPTO_FileHashContext *fhc)
+{
+  GNUNET_SCHEDULER_cancel (fhc->task);
+  GNUNET_free (fhc->filename);
+  GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fhc->fh));
+  GNUNET_free (fhc);
+}
+
+/* end of crypto_hash_file.c */