зеркало из https://github.com/microsoft/git.git
118 строки
2.4 KiB
C
118 строки
2.4 KiB
C
#include "cache.h"
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#include "tree-walk.h"
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#include "tree.h"
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void *fill_tree_descriptor(struct tree_desc *desc, const unsigned char *sha1)
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{
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unsigned long size = 0;
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void *buf = NULL;
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if (sha1) {
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buf = read_object_with_reference(sha1, tree_type, &size, NULL);
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if (!buf)
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die("unable to read tree %s", sha1_to_hex(sha1));
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}
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desc->size = size;
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desc->buf = buf;
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return buf;
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}
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static int entry_compare(struct name_entry *a, struct name_entry *b)
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{
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return base_name_compare(
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a->path, a->pathlen, a->mode,
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b->path, b->pathlen, b->mode);
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}
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static void entry_clear(struct name_entry *a)
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{
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memset(a, 0, sizeof(*a));
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}
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static void entry_extract(struct tree_desc *t, struct name_entry *a)
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{
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a->sha1 = tree_entry_extract(t, &a->path, &a->mode);
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a->pathlen = strlen(a->path);
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}
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void update_tree_entry(struct tree_desc *desc)
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{
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void *buf = desc->buf;
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unsigned long size = desc->size;
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int len = strlen(buf) + 1 + 20;
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if (size < len)
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die("corrupt tree file");
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desc->buf = buf + len;
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desc->size = size - len;
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}
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const unsigned char *tree_entry_extract(struct tree_desc *desc, const char **pathp, unsigned int *modep)
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{
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void *tree = desc->buf;
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unsigned long size = desc->size;
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int len = strlen(tree)+1;
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const unsigned char *sha1 = tree + len;
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const char *path = strchr(tree, ' ');
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unsigned int mode;
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if (!path || size < len + 20 || sscanf(tree, "%o", &mode) != 1)
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die("corrupt tree file");
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*pathp = path+1;
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*modep = canon_mode(mode);
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return sha1;
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}
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void traverse_trees(int n, struct tree_desc *t, const char *base, traverse_callback_t callback)
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{
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struct name_entry *entry = xmalloc(n*sizeof(*entry));
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for (;;) {
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struct name_entry entry[3];
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unsigned long mask = 0;
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int i, last;
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last = -1;
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for (i = 0; i < n; i++) {
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if (!t[i].size)
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continue;
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entry_extract(t+i, entry+i);
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if (last >= 0) {
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int cmp = entry_compare(entry+i, entry+last);
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/*
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* Is the new name bigger than the old one?
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* Ignore it
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*/
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if (cmp > 0)
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continue;
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/*
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* Is the new name smaller than the old one?
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* Ignore all old ones
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*/
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if (cmp < 0)
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mask = 0;
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}
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mask |= 1ul << i;
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last = i;
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}
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if (!mask)
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break;
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/*
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* Update the tree entries we've walked, and clear
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* all the unused name-entries.
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*/
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for (i = 0; i < n; i++) {
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if (mask & (1ul << i)) {
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update_tree_entry(t+i);
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continue;
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}
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entry_clear(entry + i);
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}
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callback(n, mask, entry, base);
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}
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free(entry);
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}
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