NAME¶

mdex_add, mdex_addfile, mdex_alias - index data, files and directories

LIBRARY¶

Librecast library (liblibrecast, -llibrecast)

SYNOPSIS¶

#include <librecast/mdex.h>

int mdex_add(mdex_t *mdex, void *data, size_t len, q_t *q, int flags);
int mdex_addfile(mdex_t *mdex, const char *path, q_t *q, int flags);
int mdex_alias(mdex_t *mdex, unsigned char *alias, size_t aliaslen,
               unsigned char *hash, size_t hashlen);

Compile and link with -llibrecast.

DESCRIPTION¶

The mdex_add function builds a merkle tree from data with length len and adds entries for both the tree and chunks to mdex.

The mdex_addfile function builds a merkle tree from the file or directory at path and adds entries for the trees and chunks to mdex.

The mdex_alias function adds an entry alias of length aliaslen which points to the entry hash of length hashlen which must already exist in mdex.

If q is not NULL, it must point to a queue q_t structure previously initialized with q_init(3). This will be passed through to mtree_build(3) to build the merkle tree. This is normally used in conjunction with a threadpool created with q_pool_create(3) with threads all calling q_job_seek(3).

The flags argument is the bitwise OR of zero of more of the following flags:

MDEX_ALIAS

Entry is a pointer to another entry.

MDEX_RAND Entry should be sent using random symbols.

MDEX_RECURSE Recursively index all files and directories below path. (mdex_addfile)

MDEX_MOUNT If set, stay within the same filesystem (i.e., do not cross mount points).

MDEX_SYMLINK

Follow symbolic links when recursively indexing.

RETURN VALUE¶

These function return zero on success. On error, -1 is returned, and errno is set to indicate the error.

ERRORS¶

EINVAL

Invalid argument. Both mdex and hash are required (not NULL), and hashlen > 0.

ENOMEM Not enough space/cannot allocate memory (POSIX.1-2001).

SEE ALSO¶

mdex_init(3), mdex_free(3), mdex_get(3), mdex_put(3), mdex_del(3), mtree_build(3), q_init(3), q_pool_create(3), q_job_seek(3) lc_share(3)