forked from lix-project/lix
111 lines
2.8 KiB
C++
111 lines
2.8 KiB
C++
#include <cerrno>
|
|
#include <map>
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <unistd.h>
|
|
#include <dirent.h>
|
|
#include <fcntl.h>
|
|
|
|
#include "references.hh"
|
|
#include "hash.hh"
|
|
|
|
|
|
static void search(const string & s,
|
|
Strings & ids, Strings & seen)
|
|
{
|
|
for (Strings::iterator i = ids.begin();
|
|
i != ids.end(); )
|
|
{
|
|
if (s.find(*i) == string::npos)
|
|
i++;
|
|
else {
|
|
debug(format("found reference to `%1%'") % *i);
|
|
seen.push_back(*i);
|
|
i = ids.erase(i);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void checkPath(const string & path,
|
|
Strings & ids, Strings & seen)
|
|
{
|
|
struct stat st;
|
|
if (lstat(path.c_str(), &st))
|
|
throw SysError(format("getting attributes of path `%1%'") % path);
|
|
|
|
if (S_ISDIR(st.st_mode)) {
|
|
DIR * dir = opendir(path.c_str());
|
|
|
|
struct dirent * dirent;
|
|
while (errno = 0, dirent = readdir(dir)) {
|
|
string name = dirent->d_name;
|
|
if (name == "." || name == "..") continue;
|
|
search(name, ids, seen);
|
|
checkPath(path + "/" + name, ids, seen);
|
|
}
|
|
|
|
closedir(dir); /* !!! close on exception */
|
|
}
|
|
|
|
else if (S_ISREG(st.st_mode)) {
|
|
|
|
debug(format("checking `%1%'") % path);
|
|
|
|
int fd = open(path.c_str(), O_RDONLY);
|
|
if (fd == -1) throw SysError(format("opening file `%1%'") % path);
|
|
|
|
unsigned char * buf = new unsigned char[st.st_size];
|
|
|
|
readFull(fd, buf, st.st_size);
|
|
|
|
search(string((char *) buf, st.st_size), ids, seen);
|
|
|
|
delete buf; /* !!! autodelete */
|
|
|
|
close(fd); /* !!! close on exception */
|
|
}
|
|
|
|
else if (S_ISLNK(st.st_mode)) {
|
|
char buf[st.st_size];
|
|
if (readlink(path.c_str(), buf, st.st_size) != st.st_size)
|
|
throw SysError(format("reading symbolic link `%1%'") % path);
|
|
search(string(buf, st.st_size), ids, seen);
|
|
}
|
|
|
|
else throw Error(format("unknown file type: %1%") % path);
|
|
}
|
|
|
|
|
|
Strings filterReferences(const string & path, const Strings & paths)
|
|
{
|
|
map<string, string> backMap;
|
|
Strings ids;
|
|
Strings seen;
|
|
|
|
/* For efficiency (and a higher hit rate), just search for the
|
|
hash part of the file name. (This assumes that all references
|
|
have the form `HASH-bla'). */
|
|
for (Strings::const_iterator i = paths.begin();
|
|
i != paths.end(); i++)
|
|
{
|
|
string s = string(baseNameOf(*i), 0, 32);
|
|
parseHash(s);
|
|
ids.push_back(s);
|
|
backMap[s] = *i;
|
|
}
|
|
|
|
checkPath(path, ids, seen);
|
|
|
|
Strings found;
|
|
for (Strings::iterator i = seen.begin(); i != seen.end(); i++)
|
|
{
|
|
map<string, string>::iterator j;
|
|
if ((j = backMap.find(*i)) == backMap.end()) abort();
|
|
found.push_back(j->second);
|
|
}
|
|
|
|
return found;
|
|
}
|