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tag: v1.0.2
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#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;
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 = 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;
}

int read_tree_recursive(void *buffer, unsigned long size,
const char *base, int baselen,
int stage, const char **match,
read_tree_fn_t fn)
{
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;

switch (fn(sha1, base, baselen, path, mode, stage)) {
case 0:
continue;
case READ_TREE_RECURSIVE:
break;;
default:
return -1;
}
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, fn);
free(eltbuf);
free(newbase);
if (retval)
return -1;
continue;
}
}
return 0;
}

int read_tree(void *buffer, unsigned long size, int stage, const char **match)
{
return read_tree_recursive(buffer, size, "", 0, stage, match, read_one_entry);
}

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++;
*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);
}
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