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e702496e43
This abstracts away the size of the hash values when copying them from memory location to memory location, much as the introduction of hashcmp abstracted away hash value comparsion. A few call sites were using char* rather than unsigned char* so I added the cast rather than open hashcpy to be void*. This is a reasonable tradeoff as most call sites already use unsigned char* and the existing hashcmp is also declared to be unsigned char*. [jc: Splitted the patch to "master" part, to be followed by a patch for merge-recursive.c which is not in "master" yet. Fixed the cast in the latter hunk to combine-diff.c which was wrong in the original. Also converted ones left-over in combine-diff.c, diff-lib.c and upload-pack.c ] Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
558 lines
12 KiB
C
558 lines
12 KiB
C
#include "cache.h"
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#include "tree.h"
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#include "cache-tree.h"
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#define DEBUG 0
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struct cache_tree *cache_tree(void)
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{
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struct cache_tree *it = xcalloc(1, sizeof(struct cache_tree));
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it->entry_count = -1;
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return it;
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}
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void cache_tree_free(struct cache_tree **it_p)
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{
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int i;
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struct cache_tree *it = *it_p;
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if (!it)
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return;
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for (i = 0; i < it->subtree_nr; i++)
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if (it->down[i])
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cache_tree_free(&it->down[i]->cache_tree);
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free(it->down);
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free(it);
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*it_p = NULL;
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}
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static int subtree_name_cmp(const char *one, int onelen,
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const char *two, int twolen)
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{
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if (onelen < twolen)
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return -1;
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if (twolen < onelen)
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return 1;
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return memcmp(one, two, onelen);
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}
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static int subtree_pos(struct cache_tree *it, const char *path, int pathlen)
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{
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struct cache_tree_sub **down = it->down;
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int lo, hi;
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lo = 0;
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hi = it->subtree_nr;
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while (lo < hi) {
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int mi = (lo + hi) / 2;
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struct cache_tree_sub *mdl = down[mi];
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int cmp = subtree_name_cmp(path, pathlen,
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mdl->name, mdl->namelen);
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if (!cmp)
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return mi;
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if (cmp < 0)
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hi = mi;
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else
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lo = mi + 1;
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}
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return -lo-1;
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}
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static struct cache_tree_sub *find_subtree(struct cache_tree *it,
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const char *path,
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int pathlen,
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int create)
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{
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struct cache_tree_sub *down;
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int pos = subtree_pos(it, path, pathlen);
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if (0 <= pos)
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return it->down[pos];
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if (!create)
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return NULL;
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pos = -pos-1;
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if (it->subtree_alloc <= it->subtree_nr) {
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it->subtree_alloc = alloc_nr(it->subtree_alloc);
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it->down = xrealloc(it->down, it->subtree_alloc *
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sizeof(*it->down));
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}
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it->subtree_nr++;
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down = xmalloc(sizeof(*down) + pathlen + 1);
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down->cache_tree = NULL;
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down->namelen = pathlen;
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memcpy(down->name, path, pathlen);
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down->name[pathlen] = 0;
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if (pos < it->subtree_nr)
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memmove(it->down + pos + 1,
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it->down + pos,
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sizeof(down) * (it->subtree_nr - pos - 1));
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it->down[pos] = down;
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return down;
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}
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struct cache_tree_sub *cache_tree_sub(struct cache_tree *it, const char *path)
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{
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int pathlen = strlen(path);
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return find_subtree(it, path, pathlen, 1);
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}
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void cache_tree_invalidate_path(struct cache_tree *it, const char *path)
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{
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/* a/b/c
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* ==> invalidate self
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* ==> find "a", have it invalidate "b/c"
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* a
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* ==> invalidate self
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* ==> if "a" exists as a subtree, remove it.
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*/
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const char *slash;
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int namelen;
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struct cache_tree_sub *down;
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#if DEBUG
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fprintf(stderr, "cache-tree invalidate <%s>\n", path);
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#endif
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if (!it)
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return;
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slash = strchr(path, '/');
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it->entry_count = -1;
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if (!slash) {
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int pos;
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namelen = strlen(path);
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pos = subtree_pos(it, path, namelen);
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if (0 <= pos) {
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cache_tree_free(&it->down[pos]->cache_tree);
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free(it->down[pos]);
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/* 0 1 2 3 4 5
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* ^ ^subtree_nr = 6
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* pos
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* move 4 and 5 up one place (2 entries)
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* 2 = 6 - 3 - 1 = subtree_nr - pos - 1
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*/
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memmove(it->down+pos, it->down+pos+1,
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sizeof(struct cache_tree_sub *) *
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(it->subtree_nr - pos - 1));
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it->subtree_nr--;
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}
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return;
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}
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namelen = slash - path;
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down = find_subtree(it, path, namelen, 0);
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if (down)
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cache_tree_invalidate_path(down->cache_tree, slash + 1);
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}
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static int verify_cache(struct cache_entry **cache,
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int entries)
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{
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int i, funny;
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/* Verify that the tree is merged */
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funny = 0;
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for (i = 0; i < entries; i++) {
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struct cache_entry *ce = cache[i];
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if (ce_stage(ce)) {
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if (10 < ++funny) {
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fprintf(stderr, "...\n");
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break;
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}
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fprintf(stderr, "%s: unmerged (%s)\n",
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ce->name, sha1_to_hex(ce->sha1));
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}
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}
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if (funny)
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return -1;
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/* Also verify that the cache does not have path and path/file
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* at the same time. At this point we know the cache has only
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* stage 0 entries.
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*/
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funny = 0;
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for (i = 0; i < entries - 1; i++) {
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/* path/file always comes after path because of the way
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* the cache is sorted. Also path can appear only once,
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* which means conflicting one would immediately follow.
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*/
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const char *this_name = cache[i]->name;
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const char *next_name = cache[i+1]->name;
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int this_len = strlen(this_name);
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if (this_len < strlen(next_name) &&
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strncmp(this_name, next_name, this_len) == 0 &&
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next_name[this_len] == '/') {
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if (10 < ++funny) {
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fprintf(stderr, "...\n");
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break;
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}
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fprintf(stderr, "You have both %s and %s\n",
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this_name, next_name);
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}
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}
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if (funny)
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return -1;
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return 0;
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}
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static void discard_unused_subtrees(struct cache_tree *it)
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{
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struct cache_tree_sub **down = it->down;
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int nr = it->subtree_nr;
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int dst, src;
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for (dst = src = 0; src < nr; src++) {
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struct cache_tree_sub *s = down[src];
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if (s->used)
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down[dst++] = s;
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else {
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cache_tree_free(&s->cache_tree);
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free(s);
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it->subtree_nr--;
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}
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}
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}
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int cache_tree_fully_valid(struct cache_tree *it)
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{
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int i;
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if (!it)
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return 0;
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if (it->entry_count < 0 || !has_sha1_file(it->sha1))
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return 0;
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for (i = 0; i < it->subtree_nr; i++) {
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if (!cache_tree_fully_valid(it->down[i]->cache_tree))
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return 0;
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}
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return 1;
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}
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static int update_one(struct cache_tree *it,
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struct cache_entry **cache,
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int entries,
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const char *base,
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int baselen,
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int missing_ok,
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int dryrun)
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{
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unsigned long size, offset;
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char *buffer;
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int i;
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if (0 <= it->entry_count && has_sha1_file(it->sha1))
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return it->entry_count;
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/*
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* We first scan for subtrees and update them; we start by
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* marking existing subtrees -- the ones that are unmarked
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* should not be in the result.
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*/
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for (i = 0; i < it->subtree_nr; i++)
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it->down[i]->used = 0;
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/*
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* Find the subtrees and update them.
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*/
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for (i = 0; i < entries; i++) {
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struct cache_entry *ce = cache[i];
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struct cache_tree_sub *sub;
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const char *path, *slash;
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int pathlen, sublen, subcnt;
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path = ce->name;
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pathlen = ce_namelen(ce);
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if (pathlen <= baselen || memcmp(base, path, baselen))
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break; /* at the end of this level */
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slash = strchr(path + baselen, '/');
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if (!slash)
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continue;
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/*
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* a/bbb/c (base = a/, slash = /c)
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* ==>
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* path+baselen = bbb/c, sublen = 3
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*/
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sublen = slash - (path + baselen);
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sub = find_subtree(it, path + baselen, sublen, 1);
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if (!sub->cache_tree)
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sub->cache_tree = cache_tree();
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subcnt = update_one(sub->cache_tree,
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cache + i, entries - i,
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path,
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baselen + sublen + 1,
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missing_ok,
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dryrun);
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i += subcnt - 1;
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sub->used = 1;
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}
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discard_unused_subtrees(it);
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/*
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* Then write out the tree object for this level.
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*/
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size = 8192;
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buffer = xmalloc(size);
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offset = 0;
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for (i = 0; i < entries; i++) {
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struct cache_entry *ce = cache[i];
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struct cache_tree_sub *sub;
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const char *path, *slash;
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int pathlen, entlen;
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const unsigned char *sha1;
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unsigned mode;
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path = ce->name;
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pathlen = ce_namelen(ce);
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if (pathlen <= baselen || memcmp(base, path, baselen))
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break; /* at the end of this level */
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slash = strchr(path + baselen, '/');
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if (slash) {
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entlen = slash - (path + baselen);
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sub = find_subtree(it, path + baselen, entlen, 0);
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if (!sub)
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die("cache-tree.c: '%.*s' in '%s' not found",
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entlen, path + baselen, path);
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i += sub->cache_tree->entry_count - 1;
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sha1 = sub->cache_tree->sha1;
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mode = S_IFDIR;
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}
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else {
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sha1 = ce->sha1;
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mode = ntohl(ce->ce_mode);
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entlen = pathlen - baselen;
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}
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if (!missing_ok && !has_sha1_file(sha1))
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return error("invalid object %s", sha1_to_hex(sha1));
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if (!ce->ce_mode)
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continue; /* entry being removed */
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if (size < offset + entlen + 100) {
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size = alloc_nr(offset + entlen + 100);
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buffer = xrealloc(buffer, size);
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}
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offset += sprintf(buffer + offset,
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"%o %.*s", mode, entlen, path + baselen);
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buffer[offset++] = 0;
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hashcpy((unsigned char*)buffer + offset, sha1);
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offset += 20;
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#if DEBUG
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fprintf(stderr, "cache-tree update-one %o %.*s\n",
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mode, entlen, path + baselen);
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#endif
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}
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if (dryrun) {
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unsigned char hdr[200];
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int hdrlen;
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write_sha1_file_prepare(buffer, offset, tree_type, it->sha1,
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hdr, &hdrlen);
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}
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else
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write_sha1_file(buffer, offset, tree_type, it->sha1);
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free(buffer);
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it->entry_count = i;
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#if DEBUG
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fprintf(stderr, "cache-tree update-one (%d ent, %d subtree) %s\n",
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it->entry_count, it->subtree_nr,
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sha1_to_hex(it->sha1));
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#endif
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return i;
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}
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int cache_tree_update(struct cache_tree *it,
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struct cache_entry **cache,
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int entries,
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int missing_ok,
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int dryrun)
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{
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int i;
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i = verify_cache(cache, entries);
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if (i)
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return i;
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i = update_one(it, cache, entries, "", 0, missing_ok, dryrun);
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if (i < 0)
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return i;
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return 0;
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}
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static void *write_one(struct cache_tree *it,
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char *path,
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int pathlen,
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char *buffer,
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unsigned long *size,
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unsigned long *offset)
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{
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int i;
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/* One "cache-tree" entry consists of the following:
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* path (NUL terminated)
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* entry_count, subtree_nr ("%d %d\n")
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* tree-sha1 (missing if invalid)
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* subtree_nr "cache-tree" entries for subtrees.
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*/
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if (*size < *offset + pathlen + 100) {
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*size = alloc_nr(*offset + pathlen + 100);
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buffer = xrealloc(buffer, *size);
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}
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*offset += sprintf(buffer + *offset, "%.*s%c%d %d\n",
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pathlen, path, 0,
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it->entry_count, it->subtree_nr);
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#if DEBUG
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if (0 <= it->entry_count)
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fprintf(stderr, "cache-tree <%.*s> (%d ent, %d subtree) %s\n",
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pathlen, path, it->entry_count, it->subtree_nr,
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sha1_to_hex(it->sha1));
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else
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fprintf(stderr, "cache-tree <%.*s> (%d subtree) invalid\n",
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pathlen, path, it->subtree_nr);
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#endif
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if (0 <= it->entry_count) {
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hashcpy((unsigned char*)buffer + *offset, it->sha1);
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*offset += 20;
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}
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for (i = 0; i < it->subtree_nr; i++) {
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struct cache_tree_sub *down = it->down[i];
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if (i) {
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struct cache_tree_sub *prev = it->down[i-1];
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if (subtree_name_cmp(down->name, down->namelen,
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prev->name, prev->namelen) <= 0)
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die("fatal - unsorted cache subtree");
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}
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buffer = write_one(down->cache_tree, down->name, down->namelen,
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buffer, size, offset);
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}
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return buffer;
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}
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void *cache_tree_write(struct cache_tree *root, unsigned long *size_p)
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{
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char path[PATH_MAX];
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unsigned long size = 8192;
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char *buffer = xmalloc(size);
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*size_p = 0;
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path[0] = 0;
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return write_one(root, path, 0, buffer, &size, size_p);
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}
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static struct cache_tree *read_one(const char **buffer, unsigned long *size_p)
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{
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const char *buf = *buffer;
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unsigned long size = *size_p;
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const char *cp;
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char *ep;
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struct cache_tree *it;
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int i, subtree_nr;
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it = NULL;
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/* skip name, but make sure name exists */
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while (size && *buf) {
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size--;
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buf++;
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}
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if (!size)
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goto free_return;
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buf++; size--;
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it = cache_tree();
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cp = buf;
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it->entry_count = strtol(cp, &ep, 10);
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if (cp == ep)
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goto free_return;
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cp = ep;
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subtree_nr = strtol(cp, &ep, 10);
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if (cp == ep)
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goto free_return;
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while (size && *buf && *buf != '\n') {
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size--;
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buf++;
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}
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if (!size)
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goto free_return;
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buf++; size--;
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if (0 <= it->entry_count) {
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if (size < 20)
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goto free_return;
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hashcpy(it->sha1, (unsigned char*)buf);
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buf += 20;
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size -= 20;
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}
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#if DEBUG
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if (0 <= it->entry_count)
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fprintf(stderr, "cache-tree <%s> (%d ent, %d subtree) %s\n",
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*buffer, it->entry_count, subtree_nr,
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sha1_to_hex(it->sha1));
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else
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fprintf(stderr, "cache-tree <%s> (%d subtrees) invalid\n",
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*buffer, subtree_nr);
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#endif
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/*
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* Just a heuristic -- we do not add directories that often but
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* we do not want to have to extend it immediately when we do,
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* hence +2.
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*/
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it->subtree_alloc = subtree_nr + 2;
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it->down = xcalloc(it->subtree_alloc, sizeof(struct cache_tree_sub *));
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for (i = 0; i < subtree_nr; i++) {
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/* read each subtree */
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struct cache_tree *sub;
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struct cache_tree_sub *subtree;
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const char *name = buf;
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sub = read_one(&buf, &size);
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if (!sub)
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goto free_return;
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subtree = cache_tree_sub(it, name);
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subtree->cache_tree = sub;
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}
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if (subtree_nr != it->subtree_nr)
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die("cache-tree: internal error");
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*buffer = buf;
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*size_p = size;
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return it;
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free_return:
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cache_tree_free(&it);
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return NULL;
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}
|
|
|
|
struct cache_tree *cache_tree_read(const char *buffer, unsigned long size)
|
|
{
|
|
if (buffer[0])
|
|
return NULL; /* not the whole tree */
|
|
return read_one(&buffer, &size);
|
|
}
|
|
|
|
struct cache_tree *cache_tree_find(struct cache_tree *it, const char *path)
|
|
{
|
|
while (*path) {
|
|
const char *slash;
|
|
struct cache_tree_sub *sub;
|
|
|
|
slash = strchr(path, '/');
|
|
if (!slash)
|
|
slash = path + strlen(path);
|
|
/* between path and slash is the name of the
|
|
* subtree to look for.
|
|
*/
|
|
sub = find_subtree(it, path, slash - path, 0);
|
|
if (!sub)
|
|
return NULL;
|
|
it = sub->cache_tree;
|
|
if (slash)
|
|
while (*slash && *slash == '/')
|
|
slash++;
|
|
if (!slash || !*slash)
|
|
return it; /* prefix ended with slashes */
|
|
path = slash;
|
|
}
|
|
return it;
|
|
}
|