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 2, or (at your
+ 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
/**
* @file fs/fs_tree.h
* @brief Merkle-tree-ish-CHK file encoding for GNUnet
- * @see http://gnunet.org/encoding.php3
+ * @see https://gnunet.org/encoding
* @author Krista Bennett
* @author Christian Grothoff
*
#ifndef GNUNET_FS_TREE_H
#define GNUNET_FS_TREE_H
-#include "fs.h"
+#include "fs_api.h"
+
+/**
+ * Compute the depth of the CHK tree.
+ *
+ * @param flen file length for which to compute the depth
+ * @return depth of the tree, always > 0. A depth of 1 means only a DBLOCK.
+ */
+unsigned int
+GNUNET_FS_compute_depth (uint64_t flen);
+
+
+/**
+ * Calculate how many bytes of payload a block tree of the given
+ * depth MAY correspond to at most (this function ignores the fact that
+ * some blocks will only be present partially due to the total file
+ * size cutting some blocks off at the end).
+ *
+ * @param depth depth of the block. depth==0 is a DBLOCK.
+ * @return number of bytes of payload a subtree of this depth may correspond to
+ */
+uint64_t
+GNUNET_FS_tree_compute_tree_size (unsigned int depth);
+
+
+/**
+ * Compute how many bytes of data should be stored in
+ * the specified block.
+ *
+ * @param fsize overall file size, must be > 0.
+ * @param offset offset in the original data corresponding
+ * to the beginning of the tree induced by the block;
+ * must be < fsize
+ * @param depth depth of the node in the tree, 0 for DBLOCK
+ * @return number of bytes stored in this node
+ */
+size_t
+GNUNET_FS_tree_calculate_block_size (uint64_t fsize, uint64_t offset,
+ unsigned int depth);
+
/**
* Context for an ECRS-based file encoder that computes
* or (on error) "GNUNET_FS_tree_encode_finish".
*
* @param cls closure
- * @param query the query for the block (key for lookup in the datastore)
+ * @param chk content hash key for the block
* @param offset offset of the block
+ * @param depth depth of the block, 0 for DBLOCKs
* @param type type of the block (IBLOCK or DBLOCK)
* @param block the (encrypted) block
* @param block_size size of block (in bytes)
*/
-typedef void (*GNUNET_FS_TreeBlockProcessor)(void *cls,
- const GNUNET_HashCode *query,
- uint64_t offset,
- unsigned int type,
- const void *block,
- uint16_t block_size);
-
+typedef void (*GNUNET_FS_TreeBlockProcessor) (void *cls,
+ const struct ContentHashKey * chk,
+ uint64_t offset,
+ unsigned int depth,
+ enum GNUNET_BLOCK_Type type,
+ const void *block,
+ uint16_t block_size);
+
/**
* Function called with information about our
* @param offset where are we in the file
* @param pt_block plaintext of the currently processed block
* @param pt_size size of pt_block
- * @param depth depth of the block in the tree
+ * @param depth depth of the block in the tree, 0 for DBLOCKS
*/
-typedef void (*GNUNET_FS_TreeProgressCallback)(void *cls,
- uint64_t offset,
- const void *pt_block,
- size_t pt_size,
- unsigned int depth);
-
+typedef void (*GNUNET_FS_TreeProgressCallback) (void *cls, uint64_t offset,
+ const void *pt_block,
+ size_t pt_size,
+ unsigned int depth);
+
/**
* Initialize a tree encoder. This function will call "proc" and
* @param cls closure for reader, proc, progress and cont
* @param reader function to call to read plaintext data
* @param proc function to call on each encrypted block
- * @param progress function to call with progress information
+ * @param progress function to call with progress information
* @param cont function to call when done
* @return tree encoder context
*/
struct GNUNET_FS_TreeEncoder *
-GNUNET_FS_tree_encoder_create (struct GNUNET_FS_Handle *h,
- uint64_t size,
- void *cls,
- GNUNET_FS_DataReader reader,
- GNUNET_FS_TreeBlockProcessor proc,
- GNUNET_FS_TreeProgressCallback progress,
- GNUNET_SCHEDULER_Task cont);
+GNUNET_FS_tree_encoder_create (struct GNUNET_FS_Handle *h, uint64_t size,
+ void *cls, GNUNET_FS_DataReader reader,
+ GNUNET_FS_TreeBlockProcessor proc,
+ GNUNET_FS_TreeProgressCallback progress,
+ GNUNET_SCHEDULER_Task cont);
/**
- * Encrypt the next block of the file (and
- * call proc and progress accordingly; or
+ * Encrypt the next block of the file (and
+ * call proc and progress accordingly; or
* of course "cont" if we have already completed
* encoding of the entire file).
*
* @param te tree encoder to use
*/
-void GNUNET_FS_tree_encoder_next (struct GNUNET_FS_TreeEncoder * te);
+void
+GNUNET_FS_tree_encoder_next (struct GNUNET_FS_TreeEncoder *te);
/**
* Clean up a tree encoder and return information
* about the resulting URI or an error message.
- *
+ *
* @param te the tree encoder to clean up
* @param uri set to the resulting URI (if encoding finished)
* @param emsg set to an error message (if an error occured
* prior to completion and prior to an internal error,
* both "*uri" and "*emsg" will be set to NULL).
*/
-void GNUNET_FS_tree_encoder_finish (struct GNUNET_FS_TreeEncoder * te,
- struct GNUNET_FS_Uri **uri,
- char **emsg);
+void
+GNUNET_FS_tree_encoder_finish (struct GNUNET_FS_TreeEncoder *te,
+ struct GNUNET_FS_Uri **uri, char **emsg);
#if 0
/**
* Get data that would be needed to resume
* the encoding later.
- *
+ *
* @param te encoding to resume
* @param data set to the resume data
* @param size set to the size of the resume data
*/
-void GNUNET_FS_tree_encoder_resume_get_data (const struct GNUNET_FS_TreeEncoder * te,
- void **data,
- size_t *size);
+void
+GNUNET_FS_tree_encoder_resume_get_data (const struct GNUNET_FS_TreeEncoder *te,
+ void **data, size_t * size);
/**
* Reset tree encoder to point previously
* obtained for resuming.
- *
+ *
* @param te encoding to resume
* @param data the resume data
* @param size the size of the resume data
*/
-void GNUNET_FS_tree_encoder_resume (struct GNUNET_FS_TreeEncoder * te,
- const void *data,
- size_t size);
+void
+GNUNET_FS_tree_encoder_resume (struct GNUNET_FS_TreeEncoder *te,
+ const void *data, size_t size);
#endif
#endif
projects / oweals / gnunet.git / blobdiff