thodg/libgit2/src/git

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  • Hash : 68535125
    Author : Vicent Marti
    Date : 2010-07-09T20:19:56

    Add support for git index files The new 'git_index' structure is an in-memory representation of a git index on disk; the 'git_index_entry' structures represent each one of the file entries on the index. The following calls for index instantiation have been added: git_index_alloc(): instantiate a new index structure git_index_free(): free an existing index git_index_clear(): clear all the entires in an existing file The following calls for index reading and writing have been added: git_index_read(): update the contents of the index structure from its file on disk. Internally implemented through: git_index__parse() Index files are stored on disk in network byte order; all integer fields inside them are properly converted to the machine's byte order when loading them in memory. The parsing engine also distinguishes between normal index entries and extended entries with 2 extra bytes of flags. The 'TREE' extension for index entries is also loaded into memory: Tree caches stored in Index files are loaded into the 'git_index_tree' structure pointed by the 'tree' pointer inside 'git_index'. 'index->tree' points to the root node of the tree cache; the full tree can be traversed through each of the node's 'tree->children'. Index files can be written back to disk through: git_index_write(): atomic writing of existing index objects backed by internal method git_index__write() The following calls for entry manipulation have been added: git_index_add(): insert an empty entry to the index git_index_find(): search an entry by its path name git_index__append(): appends a new index entry to the end of the list, resizing the entries array if required New index entries are always inserted at the end of the array; since the index entries must be sorted for it to be internally consistent, the index object is only sorted once, and if required, before accessing the whole entriea array (e.g. before writing to disk, before traversing, etc). git_index__remove_pos(): remove an index entry in a specific position git_index__sort(): sort the entries in the array by path name The entries array is sorted stably and in place using an insertion sort, which ought to be the most efficient approach since the entries array is always mostly-sorted. Signed-off-by: Vicent Marti <tanoku@gmail.com>

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