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-rw-r--r--tree.c253
1 files changed, 253 insertions, 0 deletions
diff --git a/tree.c b/tree.c
new file mode 100644
index 0000000000..4b1825c2ad
--- /dev/null
+++ b/tree.c
@@ -0,0 +1,253 @@
+#include "cache.h"
+#include "cache-tree.h"
+#include "tree.h"
+#include "blob.h"
+#include "commit.h"
+#include "tag.h"
+#include "tree-walk.h"
+
+const char *tree_type = "tree";
+
+static int read_one_entry_opt(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage, int opt)
+{
+ int len;
+ unsigned int size;
+ struct cache_entry *ce;
+
+ if (S_ISDIR(mode))
+ return READ_TREE_RECURSIVE;
+
+ len = strlen(pathname);
+ size = cache_entry_size(baselen + len);
+ ce = xcalloc(1, size);
+
+ ce->ce_mode = create_ce_mode(mode);
+ ce->ce_flags = create_ce_flags(baselen + len, stage);
+ memcpy(ce->name, base, baselen);
+ memcpy(ce->name + baselen, pathname, len+1);
+ hashcpy(ce->sha1, sha1);
+ return add_cache_entry(ce, opt);
+}
+
+static int read_one_entry(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage)
+{
+ return read_one_entry_opt(sha1, base, baselen, pathname, mode, stage,
+ ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
+}
+
+/*
+ * This is used when the caller knows there is no existing entries at
+ * the stage that will conflict with the entry being added.
+ */
+static int read_one_entry_quick(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage)
+{
+ return read_one_entry_opt(sha1, base, baselen, pathname, mode, stage,
+ ADD_CACHE_JUST_APPEND);
+}
+
+static int match_tree_entry(const char *base, int baselen, const char *path, unsigned int mode, const char **paths)
+{
+ const char *match;
+ int pathlen;
+
+ if (!paths)
+ return 1;
+ pathlen = strlen(path);
+ while ((match = *paths++) != NULL) {
+ int matchlen = strlen(match);
+
+ if (baselen >= matchlen) {
+ /* If it doesn't match, move along... */
+ if (strncmp(base, match, matchlen))
+ continue;
+ /* The base is a subdirectory of a path which was specified. */
+ return 1;
+ }
+
+ /* Does the base match? */
+ if (strncmp(base, match, baselen))
+ continue;
+
+ match += baselen;
+ matchlen -= baselen;
+
+ if (pathlen > matchlen)
+ continue;
+
+ if (matchlen > pathlen) {
+ if (match[pathlen] != '/')
+ continue;
+ if (!S_ISDIR(mode))
+ continue;
+ }
+
+ if (strncmp(path, match, pathlen))
+ continue;
+
+ return 1;
+ }
+ return 0;
+}
+
+int read_tree_recursive(struct tree *tree,
+ const char *base, int baselen,
+ int stage, const char **match,
+ read_tree_fn_t fn)
+{
+ struct tree_desc desc;
+ struct name_entry entry;
+
+ if (parse_tree(tree))
+ return -1;
+
+ init_tree_desc(&desc, tree->buffer, tree->size);
+
+ while (tree_entry(&desc, &entry)) {
+ if (!match_tree_entry(base, baselen, entry.path, entry.mode, match))
+ continue;
+
+ switch (fn(entry.sha1, base, baselen, entry.path, entry.mode, stage)) {
+ case 0:
+ continue;
+ case READ_TREE_RECURSIVE:
+ break;;
+ default:
+ return -1;
+ }
+ if (S_ISDIR(entry.mode)) {
+ int retval;
+ char *newbase;
+ unsigned int pathlen = tree_entry_len(entry.path, entry.sha1);
+
+ newbase = xmalloc(baselen + 1 + pathlen);
+ memcpy(newbase, base, baselen);
+ memcpy(newbase + baselen, entry.path, pathlen);
+ newbase[baselen + pathlen] = '/';
+ retval = read_tree_recursive(lookup_tree(entry.sha1),
+ newbase,
+ baselen + pathlen + 1,
+ stage, match, fn);
+ free(newbase);
+ if (retval)
+ return -1;
+ continue;
+ }
+ }
+ return 0;
+}
+
+static int cmp_cache_name_compare(const void *a_, const void *b_)
+{
+ const struct cache_entry *ce1, *ce2;
+
+ ce1 = *((const struct cache_entry **)a_);
+ ce2 = *((const struct cache_entry **)b_);
+ return cache_name_compare(ce1->name, ce1->ce_flags,
+ ce2->name, ce2->ce_flags);
+}
+
+int read_tree(struct tree *tree, int stage, const char **match)
+{
+ read_tree_fn_t fn = NULL;
+ int i, err;
+
+ /*
+ * Currently the only existing callers of this function all
+ * call it with stage=1 and after making sure there is nothing
+ * at that stage; we could always use read_one_entry_quick().
+ *
+ * But when we decide to straighten out git-read-tree not to
+ * use unpack_trees() in some cases, this will probably start
+ * to matter.
+ */
+
+ /*
+ * See if we have cache entry at the stage. If so,
+ * do it the original slow way, otherwise, append and then
+ * sort at the end.
+ */
+ for (i = 0; !fn && i < active_nr; i++) {
+ struct cache_entry *ce = active_cache[i];
+ if (ce_stage(ce) == stage)
+ fn = read_one_entry;
+ }
+
+ if (!fn)
+ fn = read_one_entry_quick;
+ err = read_tree_recursive(tree, "", 0, stage, match, fn);
+ if (fn == read_one_entry || err)
+ return err;
+
+ /*
+ * Sort the cache entry -- we need to nuke the cache tree, though.
+ */
+ cache_tree_free(&active_cache_tree);
+ qsort(active_cache, active_nr, sizeof(active_cache[0]),
+ cmp_cache_name_compare);
+ return 0;
+}
+
+struct tree *lookup_tree(const unsigned char *sha1)
+{
+ struct object *obj = lookup_object(sha1);
+ if (!obj)
+ return create_object(sha1, OBJ_TREE, alloc_tree_node());
+ if (!obj->type)
+ obj->type = OBJ_TREE;
+ if (obj->type != OBJ_TREE) {
+ error("Object %s is a %s, not a tree",
+ sha1_to_hex(sha1), typename(obj->type));
+ return NULL;
+ }
+ return (struct tree *) obj;
+}
+
+int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)
+{
+ if (item->object.parsed)
+ return 0;
+ item->object.parsed = 1;
+ item->buffer = buffer;
+ item->size = size;
+
+ return 0;
+}
+
+int parse_tree(struct tree *item)
+{
+ enum object_type type;
+ void *buffer;
+ unsigned long size;
+
+ if (item->object.parsed)
+ return 0;
+ buffer = read_sha1_file(item->object.sha1, &type, &size);
+ if (!buffer)
+ return error("Could not read %s",
+ sha1_to_hex(item->object.sha1));
+ if (type != OBJ_TREE) {
+ free(buffer);
+ return error("Object %s not a tree",
+ sha1_to_hex(item->object.sha1));
+ }
+ return parse_tree_buffer(item, buffer, size);
+}
+
+struct tree *parse_tree_indirect(const unsigned char *sha1)
+{
+ struct object *obj = parse_object(sha1);
+ do {
+ if (!obj)
+ return NULL;
+ if (obj->type == OBJ_TREE)
+ return (struct tree *) obj;
+ else if (obj->type == OBJ_COMMIT)
+ obj = &(((struct commit *) obj)->tree->object);
+ else if (obj->type == OBJ_TAG)
+ obj = ((struct tag *) obj)->tagged;
+ else
+ return NULL;
+ if (!obj->parsed)
+ parse_object(obj->sha1);
+ } while (1);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-02 07:22:33 +0000