diff options
Diffstat (limited to 'vcs-svn/repo_tree.c')
| -rw-r--r-- | vcs-svn/repo_tree.c | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/vcs-svn/repo_tree.c b/vcs-svn/repo_tree.c new file mode 100644 index 0000000000..207ffc3a83 --- /dev/null +++ b/vcs-svn/repo_tree.c @@ -0,0 +1,322 @@ +/* + * Licensed under a two-clause BSD-style license. + * See LICENSE for details. + */ + +#include "git-compat-util.h" + +#include "string_pool.h" +#include "repo_tree.h" +#include "obj_pool.h" +#include "fast_export.h" + +#include "trp.h" + +struct repo_dirent { + uint32_t name_offset; + struct trp_node children; + uint32_t mode; + uint32_t content_offset; +}; + +struct repo_dir { + struct trp_root entries; +}; + +struct repo_commit { + uint32_t root_dir_offset; +}; + +/* Memory pools for commit, dir and dirent */ +obj_pool_gen(commit, struct repo_commit, 4096) +obj_pool_gen(dir, struct repo_dir, 4096) +obj_pool_gen(dent, struct repo_dirent, 4096) + +static uint32_t active_commit; +static uint32_t mark; + +static int repo_dirent_name_cmp(const void *a, const void *b); + +/* Treap for directory entries */ +trp_gen(static, dent_, struct repo_dirent, children, dent, repo_dirent_name_cmp) + +uint32_t next_blob_mark(void) +{ + return mark++; +} + +static struct repo_dir *repo_commit_root_dir(struct repo_commit *commit) +{ + return dir_pointer(commit->root_dir_offset); +} + +static struct repo_dirent *repo_first_dirent(struct repo_dir *dir) +{ + return dent_first(&dir->entries); +} + +static int repo_dirent_name_cmp(const void *a, const void *b) +{ + const struct repo_dirent *dent1 = a, *dent2 = b; + uint32_t a_offset = dent1->name_offset; + uint32_t b_offset = dent2->name_offset; + return (a_offset > b_offset) - (a_offset < b_offset); +} + +static int repo_dirent_is_dir(struct repo_dirent *dent) +{ + return dent != NULL && dent->mode == REPO_MODE_DIR; +} + +static struct repo_dir *repo_dir_from_dirent(struct repo_dirent *dent) +{ + if (!repo_dirent_is_dir(dent)) + return NULL; + return dir_pointer(dent->content_offset); +} + +static struct repo_dir *repo_clone_dir(struct repo_dir *orig_dir) +{ + uint32_t orig_o, new_o; + orig_o = dir_offset(orig_dir); + if (orig_o >= dir_pool.committed) + return orig_dir; + new_o = dir_alloc(1); + orig_dir = dir_pointer(orig_o); + *dir_pointer(new_o) = *orig_dir; + return dir_pointer(new_o); +} + +static struct repo_dirent *repo_read_dirent(uint32_t revision, uint32_t *path) +{ + uint32_t name = 0; + struct repo_dirent *key = dent_pointer(dent_alloc(1)); + struct repo_dir *dir = NULL; + struct repo_dirent *dent = NULL; + dir = repo_commit_root_dir(commit_pointer(revision)); + while (~(name = *path++)) { + key->name_offset = name; + dent = dent_search(&dir->entries, key); + if (dent == NULL || !repo_dirent_is_dir(dent)) + break; + dir = repo_dir_from_dirent(dent); + } + dent_free(1); + return dent; +} + +static void repo_write_dirent(uint32_t *path, uint32_t mode, + uint32_t content_offset, uint32_t del) +{ + uint32_t name, revision, dir_o = ~0, parent_dir_o = ~0; + struct repo_dir *dir; + struct repo_dirent *key; + struct repo_dirent *dent = NULL; + revision = active_commit; + dir = repo_commit_root_dir(commit_pointer(revision)); + dir = repo_clone_dir(dir); + commit_pointer(revision)->root_dir_offset = dir_offset(dir); + while (~(name = *path++)) { + parent_dir_o = dir_offset(dir); + + key = dent_pointer(dent_alloc(1)); + key->name_offset = name; + + dent = dent_search(&dir->entries, key); + if (dent == NULL) + dent = key; + else + dent_free(1); + + if (dent == key) { + dent->mode = REPO_MODE_DIR; + dent->content_offset = 0; + dent = dent_insert(&dir->entries, dent); + } + + if (dent_offset(dent) < dent_pool.committed) { + dir_o = repo_dirent_is_dir(dent) ? + dent->content_offset : ~0; + dent_remove(&dir->entries, dent); + dent = dent_pointer(dent_alloc(1)); + dent->name_offset = name; + dent->mode = REPO_MODE_DIR; + dent->content_offset = dir_o; + dent = dent_insert(&dir->entries, dent); + } + + dir = repo_dir_from_dirent(dent); + dir = repo_clone_dir(dir); + dent->content_offset = dir_offset(dir); + } + if (dent == NULL) + return; + dent->mode = mode; + dent->content_offset = content_offset; + if (del && ~parent_dir_o) + dent_remove(&dir_pointer(parent_dir_o)->entries, dent); +} + +uint32_t repo_copy(uint32_t revision, uint32_t *src, uint32_t *dst) +{ + uint32_t mode = 0, content_offset = 0; + struct repo_dirent *src_dent; + src_dent = repo_read_dirent(revision, src); + if (src_dent != NULL) { + mode = src_dent->mode; + content_offset = src_dent->content_offset; + repo_write_dirent(dst, mode, content_offset, 0); + } + return mode; +} + +void repo_add(uint32_t *path, uint32_t mode, uint32_t blob_mark) +{ + repo_write_dirent(path, mode, blob_mark, 0); +} + +uint32_t repo_modify_path(uint32_t *path, uint32_t mode, uint32_t blob_mark) +{ + struct repo_dirent *src_dent; + src_dent = repo_read_dirent(active_commit, path); + if (!src_dent) + return 0; + if (!blob_mark) + blob_mark = src_dent->content_offset; + if (!mode) + mode = src_dent->mode; + repo_write_dirent(path, mode, blob_mark, 0); + return mode; +} + +void repo_delete(uint32_t *path) +{ + repo_write_dirent(path, 0, 0, 1); +} + +static void repo_git_add_r(uint32_t depth, uint32_t *path, struct repo_dir *dir); + +static void repo_git_add(uint32_t depth, uint32_t *path, struct repo_dirent *dent) +{ + if (repo_dirent_is_dir(dent)) + repo_git_add_r(depth, path, repo_dir_from_dirent(dent)); + else + fast_export_modify(depth, path, + dent->mode, dent->content_offset); +} + +static void repo_git_add_r(uint32_t depth, uint32_t *path, struct repo_dir *dir) +{ + struct repo_dirent *de = repo_first_dirent(dir); + while (de) { + path[depth] = de->name_offset; + repo_git_add(depth + 1, path, de); + de = dent_next(&dir->entries, de); + } +} + +static void repo_diff_r(uint32_t depth, uint32_t *path, struct repo_dir *dir1, + struct repo_dir *dir2) +{ + struct repo_dirent *de1, *de2; + de1 = repo_first_dirent(dir1); + de2 = repo_first_dirent(dir2); + + while (de1 && de2) { + if (de1->name_offset < de2->name_offset) { + path[depth] = de1->name_offset; + fast_export_delete(depth + 1, path); + de1 = dent_next(&dir1->entries, de1); + continue; + } + if (de1->name_offset > de2->name_offset) { + path[depth] = de2->name_offset; + repo_git_add(depth + 1, path, de2); + de2 = dent_next(&dir2->entries, de2); + continue; + } + path[depth] = de1->name_offset; + + if (de1->mode == de2->mode && + de1->content_offset == de2->content_offset) { + ; /* No change. */ + } else if (repo_dirent_is_dir(de1) && repo_dirent_is_dir(de2)) { + repo_diff_r(depth + 1, path, + repo_dir_from_dirent(de1), + repo_dir_from_dirent(de2)); + } else if (!repo_dirent_is_dir(de1) && !repo_dirent_is_dir(de2)) { + repo_git_add(depth + 1, path, de2); + } else { + fast_export_delete(depth + 1, path); + repo_git_add(depth + 1, path, de2); + } + de1 = dent_next(&dir1->entries, de1); + de2 = dent_next(&dir2->entries, de2); + } + while (de1) { + path[depth] = de1->name_offset; + fast_export_delete(depth + 1, path); + de1 = dent_next(&dir1->entries, de1); + } + while (de2) { + path[depth] = de2->name_offset; + repo_git_add(depth + 1, path, de2); + de2 = dent_next(&dir2->entries, de2); + } +} + +static uint32_t path_stack[REPO_MAX_PATH_DEPTH]; + +void repo_diff(uint32_t r1, uint32_t r2) +{ + repo_diff_r(0, + path_stack, + repo_commit_root_dir(commit_pointer(r1)), + repo_commit_root_dir(commit_pointer(r2))); +} + +void repo_commit(uint32_t revision, uint32_t author, char *log, uint32_t uuid, + uint32_t url, unsigned long timestamp) +{ + fast_export_commit(revision, author, log, uuid, url, timestamp); + dent_commit(); + dir_commit(); + active_commit = commit_alloc(1); + commit_pointer(active_commit)->root_dir_offset = + commit_pointer(active_commit - 1)->root_dir_offset; +} + +static void mark_init(void) +{ + uint32_t i; + mark = 0; + for (i = 0; i < dent_pool.size; i++) + if (!repo_dirent_is_dir(dent_pointer(i)) && + dent_pointer(i)->content_offset > mark) + mark = dent_pointer(i)->content_offset; + mark++; +} + +void repo_init(void) +{ + mark_init(); + if (commit_pool.size == 0) { + /* Create empty tree for commit 0. */ + commit_alloc(1); + commit_pointer(0)->root_dir_offset = dir_alloc(1); + dir_pointer(0)->entries.trp_root = ~0; + dir_commit(); + } + /* Preallocate next commit, ready for changes. */ + active_commit = commit_alloc(1); + commit_pointer(active_commit)->root_dir_offset = + commit_pointer(active_commit - 1)->root_dir_offset; +} + +void repo_reset(void) +{ + pool_reset(); + commit_reset(); + dir_reset(); + dent_reset(); +} |