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Move "read_tree()" to "tree.c" to be used as a generic helper function. 

Next step: make "diff-cache" use it.
maint
Linus Torvalds 2005-04-22 16:42:37 -07:00
parent aba0668247
commit 94537c78a8
3 changed files with 71 additions and 63 deletions
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3
cache.h
View File

@ -122,6 +122,9 @@ extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned lon
extern int write_sha1_file(char *buf, unsigned len, unsigned char *return_sha1);
extern int check_sha1_signature(unsigned char *sha1, void *buf, unsigned long size, const char *type);

/* Read a tree into the cache */
extern int read_tree(void *buffer, unsigned long size, int stage);

/* Convert to/from hex/sha1 representation */
extern int get_sha1_hex(const char *hex, unsigned char *sha1);
extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */

66
read-tree.c
View File

@ -7,67 +7,7 @@

static int stage = 0;

static int read_one_entry(unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode)
{
int len = strlen(pathname);
unsigned int size = cache_entry_size(baselen + len);
struct cache_entry *ce = malloc(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, 1);
}

static int read_tree_recursive(void *buffer, unsigned long size,
const char *base, int baselen)
{
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 (S_ISDIR(mode)) {
int retval;
int pathlen = strlen(path);
char *newbase = malloc(baselen + 1 + pathlen);
void *eltbuf;
char elttype[20];
unsigned long eltsize;

eltbuf = read_sha1_file(sha1, elttype, &eltsize);
if (!eltbuf || strcmp(elttype, "tree"))
return -1;
memcpy(newbase, base, baselen);
memcpy(newbase + baselen, path, pathlen);
newbase[baselen + pathlen] = '/';
retval = read_tree_recursive(eltbuf, eltsize,
newbase,
baselen + pathlen + 1);
free(eltbuf);
free(newbase);
if (retval)
return -1;
continue;
}
if (read_one_entry(sha1, base, baselen, path, mode) < 0)
return -1;
}
return 0;
}

static int read_tree(unsigned char *sha1, const char *base, int baselen)
static int unpack_tree(unsigned char *sha1)
{
void *buffer;
unsigned long size;
@ -75,7 +15,7 @@ static int read_tree(unsigned char *sha1, const char *base, int baselen)
buffer = read_tree_with_tree_or_commit_sha1(sha1, &size, 0);
if (!buffer)
return -1;
return read_tree_recursive(buffer, size, base, baselen);
return read_tree(buffer, size, stage);
}

static char *lockfile_name;
@ -255,7 +195,7 @@ int main(int argc, char **argv)
usage(read_tree_usage);
if (stage > 3)
usage(read_tree_usage);
if (read_tree(sha1, "", 0) < 0)
if (unpack_tree(sha1) < 0)
die("failed to unpack tree object %s", arg);
stage++;
}

65
tree.c
View File

@ -5,6 +5,71 @@

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 = malloc(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, 1);
}

static int read_tree_recursive(void *buffer, unsigned long size,
const char *base, int baselen, int stage)
{
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 (S_ISDIR(mode)) {
int retval;
int pathlen = strlen(path);
char *newbase = malloc(baselen + 1 + pathlen);
void *eltbuf;
char elttype[20];
unsigned long eltsize;

eltbuf = read_sha1_file(sha1, elttype, &eltsize);
if (!eltbuf || strcmp(elttype, "tree"))
return -1;
memcpy(newbase, base, baselen);
memcpy(newbase + baselen, path, pathlen);
newbase[baselen + pathlen] = '/';
retval = read_tree_recursive(eltbuf, eltsize,
newbase,
baselen + pathlen + 1, stage);
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)
{
return read_tree_recursive(buffer, size, "", 0, stage);
}

struct tree *lookup_tree(unsigned char *sha1)
{
struct object *obj = lookup_object(sha1);