aboutsummaryrefslogtreecommitdiff
path: root/tree.c
blob: 8f490b8984bf95a13720ffb2d9b23a2dd8c03394 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
#include "tree.h"
#include "blob.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;

	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)
			add_ref(&item->object, obj);
		entry->parent = NULL; /* needs to be filled by the user */
		*list_p = entry;
		list_p = &entry->next;
	}
	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;
}