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326 lines
8.1 KiB
326 lines
8.1 KiB
/* |
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* Licensed under a two-clause BSD-style license. |
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* See LICENSE for details. |
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*/ |
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#include "git-compat-util.h" |
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#include "string_pool.h" |
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#include "repo_tree.h" |
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#include "obj_pool.h" |
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#include "fast_export.h" |
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#include "trp.h" |
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struct repo_dirent { |
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uint32_t name_offset; |
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struct trp_node children; |
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uint32_t mode; |
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uint32_t content_offset; |
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}; |
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struct repo_dir { |
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struct trp_root entries; |
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}; |
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struct repo_commit { |
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uint32_t root_dir_offset; |
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}; |
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/* Memory pools for commit, dir and dirent */ |
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obj_pool_gen(commit, struct repo_commit, 4096) |
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obj_pool_gen(dir, struct repo_dir, 4096) |
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obj_pool_gen(dent, struct repo_dirent, 4096) |
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static uint32_t active_commit; |
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static uint32_t mark; |
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static int repo_dirent_name_cmp(const void *a, const void *b); |
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/* Treap for directory entries */ |
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trp_gen(static, dent_, struct repo_dirent, children, dent, repo_dirent_name_cmp) |
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uint32_t next_blob_mark(void) |
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{ |
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return mark++; |
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} |
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static struct repo_dir *repo_commit_root_dir(struct repo_commit *commit) |
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{ |
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return dir_pointer(commit->root_dir_offset); |
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} |
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static struct repo_dirent *repo_first_dirent(struct repo_dir *dir) |
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{ |
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return dent_first(&dir->entries); |
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} |
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static int repo_dirent_name_cmp(const void *a, const void *b) |
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{ |
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const struct repo_dirent *dent1 = a, *dent2 = b; |
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uint32_t a_offset = dent1->name_offset; |
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uint32_t b_offset = dent2->name_offset; |
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return (a_offset > b_offset) - (a_offset < b_offset); |
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} |
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static int repo_dirent_is_dir(struct repo_dirent *dent) |
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{ |
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return dent != NULL && dent->mode == REPO_MODE_DIR; |
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} |
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static struct repo_dir *repo_dir_from_dirent(struct repo_dirent *dent) |
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{ |
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if (!repo_dirent_is_dir(dent)) |
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return NULL; |
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return dir_pointer(dent->content_offset); |
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} |
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static struct repo_dir *repo_clone_dir(struct repo_dir *orig_dir) |
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{ |
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uint32_t orig_o, new_o; |
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orig_o = dir_offset(orig_dir); |
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if (orig_o >= dir_pool.committed) |
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return orig_dir; |
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new_o = dir_alloc(1); |
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orig_dir = dir_pointer(orig_o); |
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*dir_pointer(new_o) = *orig_dir; |
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return dir_pointer(new_o); |
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} |
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static struct repo_dirent *repo_read_dirent(uint32_t revision, |
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const uint32_t *path) |
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{ |
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uint32_t name = 0; |
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struct repo_dirent *key = dent_pointer(dent_alloc(1)); |
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struct repo_dir *dir = NULL; |
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struct repo_dirent *dent = NULL; |
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dir = repo_commit_root_dir(commit_pointer(revision)); |
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while (~(name = *path++)) { |
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key->name_offset = name; |
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dent = dent_search(&dir->entries, key); |
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if (dent == NULL || !repo_dirent_is_dir(dent)) |
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break; |
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dir = repo_dir_from_dirent(dent); |
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} |
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dent_free(1); |
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return dent; |
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} |
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static void repo_write_dirent(const uint32_t *path, uint32_t mode, |
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uint32_t content_offset, uint32_t del) |
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{ |
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uint32_t name, revision, dir_o = ~0, parent_dir_o = ~0; |
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struct repo_dir *dir; |
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struct repo_dirent *key; |
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struct repo_dirent *dent = NULL; |
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revision = active_commit; |
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dir = repo_commit_root_dir(commit_pointer(revision)); |
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dir = repo_clone_dir(dir); |
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commit_pointer(revision)->root_dir_offset = dir_offset(dir); |
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while (~(name = *path++)) { |
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parent_dir_o = dir_offset(dir); |
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key = dent_pointer(dent_alloc(1)); |
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key->name_offset = name; |
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dent = dent_search(&dir->entries, key); |
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if (dent == NULL) |
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dent = key; |
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else |
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dent_free(1); |
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if (dent == key) { |
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dent->mode = REPO_MODE_DIR; |
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dent->content_offset = 0; |
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dent = dent_insert(&dir->entries, dent); |
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} |
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if (dent_offset(dent) < dent_pool.committed) { |
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dir_o = repo_dirent_is_dir(dent) ? |
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dent->content_offset : ~0; |
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dent_remove(&dir->entries, dent); |
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dent = dent_pointer(dent_alloc(1)); |
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dent->name_offset = name; |
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dent->mode = REPO_MODE_DIR; |
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dent->content_offset = dir_o; |
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dent = dent_insert(&dir->entries, dent); |
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} |
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dir = repo_dir_from_dirent(dent); |
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dir = repo_clone_dir(dir); |
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dent->content_offset = dir_offset(dir); |
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} |
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if (dent == NULL) |
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return; |
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dent->mode = mode; |
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dent->content_offset = content_offset; |
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if (del && ~parent_dir_o) |
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dent_remove(&dir_pointer(parent_dir_o)->entries, dent); |
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} |
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uint32_t repo_read_path(const uint32_t *path) |
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{ |
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uint32_t content_offset = 0; |
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struct repo_dirent *dent = repo_read_dirent(active_commit, path); |
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if (dent != NULL) |
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content_offset = dent->content_offset; |
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return content_offset; |
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} |
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uint32_t repo_read_mode(const uint32_t *path) |
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{ |
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struct repo_dirent *dent = repo_read_dirent(active_commit, path); |
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if (dent == NULL) |
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die("invalid dump: path to be modified is missing"); |
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return dent->mode; |
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} |
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void repo_copy(uint32_t revision, const uint32_t *src, const uint32_t *dst) |
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{ |
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uint32_t mode = 0, content_offset = 0; |
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struct repo_dirent *src_dent; |
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src_dent = repo_read_dirent(revision, src); |
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if (src_dent != NULL) { |
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mode = src_dent->mode; |
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content_offset = src_dent->content_offset; |
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repo_write_dirent(dst, mode, content_offset, 0); |
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} |
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} |
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void repo_add(uint32_t *path, uint32_t mode, uint32_t blob_mark) |
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{ |
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repo_write_dirent(path, mode, blob_mark, 0); |
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} |
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void repo_delete(uint32_t *path) |
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{ |
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repo_write_dirent(path, 0, 0, 1); |
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} |
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static void repo_git_add_r(uint32_t depth, uint32_t *path, struct repo_dir *dir); |
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static void repo_git_add(uint32_t depth, uint32_t *path, struct repo_dirent *dent) |
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{ |
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if (repo_dirent_is_dir(dent)) |
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repo_git_add_r(depth, path, repo_dir_from_dirent(dent)); |
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else |
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fast_export_modify(depth, path, |
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dent->mode, dent->content_offset); |
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} |
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static void repo_git_add_r(uint32_t depth, uint32_t *path, struct repo_dir *dir) |
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{ |
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struct repo_dirent *de = repo_first_dirent(dir); |
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while (de) { |
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path[depth] = de->name_offset; |
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repo_git_add(depth + 1, path, de); |
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de = dent_next(&dir->entries, de); |
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} |
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} |
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static void repo_diff_r(uint32_t depth, uint32_t *path, struct repo_dir *dir1, |
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struct repo_dir *dir2) |
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{ |
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struct repo_dirent *de1, *de2; |
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de1 = repo_first_dirent(dir1); |
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de2 = repo_first_dirent(dir2); |
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while (de1 && de2) { |
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if (de1->name_offset < de2->name_offset) { |
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path[depth] = de1->name_offset; |
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fast_export_delete(depth + 1, path); |
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de1 = dent_next(&dir1->entries, de1); |
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continue; |
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} |
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if (de1->name_offset > de2->name_offset) { |
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path[depth] = de2->name_offset; |
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repo_git_add(depth + 1, path, de2); |
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de2 = dent_next(&dir2->entries, de2); |
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continue; |
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} |
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path[depth] = de1->name_offset; |
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if (de1->mode == de2->mode && |
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de1->content_offset == de2->content_offset) { |
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; /* No change. */ |
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} else if (repo_dirent_is_dir(de1) && repo_dirent_is_dir(de2)) { |
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repo_diff_r(depth + 1, path, |
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repo_dir_from_dirent(de1), |
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repo_dir_from_dirent(de2)); |
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} else if (!repo_dirent_is_dir(de1) && !repo_dirent_is_dir(de2)) { |
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repo_git_add(depth + 1, path, de2); |
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} else { |
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fast_export_delete(depth + 1, path); |
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repo_git_add(depth + 1, path, de2); |
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} |
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de1 = dent_next(&dir1->entries, de1); |
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de2 = dent_next(&dir2->entries, de2); |
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} |
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while (de1) { |
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path[depth] = de1->name_offset; |
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fast_export_delete(depth + 1, path); |
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de1 = dent_next(&dir1->entries, de1); |
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} |
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while (de2) { |
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path[depth] = de2->name_offset; |
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repo_git_add(depth + 1, path, de2); |
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de2 = dent_next(&dir2->entries, de2); |
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} |
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} |
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static uint32_t path_stack[REPO_MAX_PATH_DEPTH]; |
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void repo_diff(uint32_t r1, uint32_t r2) |
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{ |
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repo_diff_r(0, |
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path_stack, |
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repo_commit_root_dir(commit_pointer(r1)), |
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repo_commit_root_dir(commit_pointer(r2))); |
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} |
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void repo_commit(uint32_t revision, const char *author, |
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const struct strbuf *log, const char *uuid, const char *url, |
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unsigned long timestamp) |
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{ |
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fast_export_commit(revision, author, log, uuid, url, timestamp); |
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dent_commit(); |
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dir_commit(); |
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active_commit = commit_alloc(1); |
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commit_pointer(active_commit)->root_dir_offset = |
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commit_pointer(active_commit - 1)->root_dir_offset; |
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} |
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static void mark_init(void) |
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{ |
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uint32_t i; |
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mark = 0; |
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for (i = 0; i < dent_pool.size; i++) |
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if (!repo_dirent_is_dir(dent_pointer(i)) && |
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dent_pointer(i)->content_offset > mark) |
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mark = dent_pointer(i)->content_offset; |
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mark++; |
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} |
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void repo_init(void) |
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{ |
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mark_init(); |
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if (commit_pool.size == 0) { |
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/* Create empty tree for commit 0. */ |
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commit_alloc(1); |
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commit_pointer(0)->root_dir_offset = dir_alloc(1); |
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dir_pointer(0)->entries.trp_root = ~0; |
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dir_commit(); |
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} |
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/* Preallocate next commit, ready for changes. */ |
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active_commit = commit_alloc(1); |
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commit_pointer(active_commit)->root_dir_offset = |
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commit_pointer(active_commit - 1)->root_dir_offset; |
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} |
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void repo_reset(void) |
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{ |
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pool_reset(); |
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commit_reset(); |
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dir_reset(); |
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dent_reset(); |
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}
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