diff options
Diffstat (limited to 'tree.c')
| -rw-r--r-- | tree.c | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/tree.c b/tree.c new file mode 100644 index 0000000000..8b42a07b20 --- /dev/null +++ b/tree.c @@ -0,0 +1,246 @@ +#include "tree.h" +#include "blob.h" +#include "commit.h" +#include "tag.h" +#include "cache.h" +#include <stdlib.h> + +const char *tree_type = "tree"; + +static int read_one_entry(unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage) +{ + int len = strlen(pathname); + unsigned int size = cache_entry_size(baselen + len); + struct cache_entry *ce = xmalloc(size); + + memset(ce, 0, 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); + memcpy(ce->sha1, sha1, 20); + return add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK); +} + +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; +} + +static int read_tree_recursive(void *buffer, unsigned long size, + const char *base, int baselen, + int stage, const char **match) +{ + while (size) { + int len = strlen(buffer)+1; + unsigned char *sha1 = buffer + len; + char *path = strchr(buffer, ' ')+1; + unsigned int mode; + + if (size < len + 20 || sscanf(buffer, "%o", &mode) != 1) + return -1; + + buffer = sha1 + 20; + size -= len + 20; + + if (!match_tree_entry(base, baselen, path, mode, match)) + continue; + + if (S_ISDIR(mode)) { + int retval; + int pathlen = strlen(path); + char *newbase; + void *eltbuf; + char elttype[20]; + unsigned long eltsize; + + eltbuf = read_sha1_file(sha1, elttype, &eltsize); + if (!eltbuf || strcmp(elttype, "tree")) { + if (eltbuf) free(eltbuf); + return -1; + } + newbase = xmalloc(baselen + 1 + pathlen); + memcpy(newbase, base, baselen); + memcpy(newbase + baselen, path, pathlen); + newbase[baselen + pathlen] = '/'; + retval = read_tree_recursive(eltbuf, eltsize, + newbase, + baselen + pathlen + 1, + stage, match); + free(eltbuf); + free(newbase); + if (retval) + return -1; + continue; + } + if (read_one_entry(sha1, base, baselen, path, mode, stage) < 0) + return -1; + } + return 0; +} + +int read_tree(void *buffer, unsigned long size, int stage, const char **match) +{ + return read_tree_recursive(buffer, size, "", 0, stage, match); +} + +struct tree *lookup_tree(const unsigned char *sha1) +{ + struct object *obj = lookup_object(sha1); + if (!obj) { + struct tree *ret = xmalloc(sizeof(struct tree)); + memset(ret, 0, sizeof(struct tree)); + created_object(sha1, &ret->object); + ret->object.type = tree_type; + return ret; + } + if (!obj->type) + obj->type = tree_type; + if (obj->type != tree_type) { + error("Object %s is a %s, not a tree", + sha1_to_hex(sha1), obj->type); + return NULL; + } + return (struct tree *) obj; +} + +int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size) +{ + void *bufptr = buffer; + struct tree_entry_list **list_p; + int n_refs = 0; + + if (item->object.parsed) + return 0; + item->object.parsed = 1; + list_p = &item->entries; + while (size) { + struct object *obj; + struct tree_entry_list *entry; + int len = 1+strlen(bufptr); + unsigned char *file_sha1 = bufptr + len; + char *path = strchr(bufptr, ' '); + unsigned int mode; + if (size < len + 20 || !path || + sscanf(bufptr, "%o", &mode) != 1) + return -1; + + entry = xmalloc(sizeof(struct tree_entry_list)); + entry->name = strdup(path + 1); + entry->directory = S_ISDIR(mode) != 0; + entry->executable = (mode & S_IXUSR) != 0; + entry->symlink = S_ISLNK(mode) != 0; + entry->zeropad = *(char *)bufptr == '0'; + entry->mode = mode; + entry->next = NULL; + + bufptr += len + 20; + size -= len + 20; + + if (entry->directory) { + entry->item.tree = lookup_tree(file_sha1); + obj = &entry->item.tree->object; + } else { + entry->item.blob = lookup_blob(file_sha1); + obj = &entry->item.blob->object; + } + if (obj) + n_refs++; + entry->parent = NULL; /* needs to be filled by the user */ + *list_p = entry; + list_p = &entry->next; + } + + if (track_object_refs) { + struct tree_entry_list *entry; + unsigned i = 0; + struct object_refs *refs = alloc_object_refs(n_refs); + for (entry = item->entries; entry; entry = entry->next) + refs->ref[i++] = entry->item.any; + set_object_refs(&item->object, refs); + } + + return 0; +} + +int parse_tree(struct tree *item) +{ + char type[20]; + void *buffer; + unsigned long size; + int ret; + + 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 (strcmp(type, tree_type)) { + free(buffer); + return error("Object %s not a tree", + sha1_to_hex(item->object.sha1)); + } + ret = parse_tree_buffer(item, buffer, size); + free(buffer); + return ret; +} + +struct tree *parse_tree_indirect(const unsigned char *sha1) +{ + struct object *obj = parse_object(sha1); + do { + if (!obj) + return NULL; + if (obj->type == tree_type) + return (struct tree *) obj; + else if (obj->type == commit_type) + obj = &(((struct commit *) obj)->tree->object); + else if (obj->type == tag_type) + obj = ((struct tag *) obj)->tagged; + else + return NULL; + if (!obj->parsed) + parse_object(obj->sha1); + } while (1); +} |