137 lines
3.2 KiB
C++
137 lines
3.2 KiB
C++
|
#include <sys/types.h>
|
||
|
|
#include <sys/stat.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <dirent.h>
|
||
|
|
#include <fcntl.h>
|
||
|
|
|
||
|
|
#include "archive.hh"
|
||
|
|
#include "util.hh"
|
||
|
|
|
||
|
|
|
||
|
|
static void pad(unsigned int len, DumpSink & sink)
|
||
|
|
{
|
||
|
|
if (len % 8) {
|
||
|
|
unsigned char zero[8];
|
||
|
|
memset(zero, 0, sizeof(zero));
|
||
|
|
sink(zero, 8 - (len % 8));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static void writeInt(unsigned int n, DumpSink & sink)
|
||
|
|
{
|
||
|
|
unsigned char buf[8];
|
||
|
|
memset(buf, 0, sizeof(buf));
|
||
|
|
buf[0] = n & 0xff;
|
||
|
|
buf[1] = (n >> 8) & 0xff;
|
||
|
|
buf[2] = (n >> 16) & 0xff;
|
||
|
|
buf[3] = (n >> 24) & 0xff;
|
||
|
|
sink(buf, sizeof(buf));
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static void writeString(const string & s, DumpSink & sink)
|
||
|
|
{
|
||
|
|
unsigned int len = s.length();
|
||
|
|
writeInt(len, sink);
|
||
|
|
sink((const unsigned char *) s.c_str(), len);
|
||
|
|
pad(len, sink);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static void dumpEntries(const string & path, DumpSink & sink)
|
||
|
|
{
|
||
|
|
DIR * dir = opendir(path.c_str());
|
||
|
|
if (!dir) throw SysError("opening directory " + path);
|
||
|
|
|
||
|
|
Strings names;
|
||
|
|
|
||
|
|
struct dirent * dirent;
|
||
|
|
while (errno = 0, dirent = readdir(dir)) {
|
||
|
|
string name = dirent->d_name;
|
||
|
|
if (name == "." || name == "..") continue;
|
||
|
|
names.push_back(name);
|
||
|
|
}
|
||
|
|
if (errno) throw SysError("reading directory " + path);
|
||
|
|
|
||
|
|
sort(names.begin(), names.end());
|
||
|
|
|
||
|
|
for (Strings::iterator it = names.begin();
|
||
|
|
it != names.end(); it++)
|
||
|
|
{
|
||
|
|
writeString("entry", sink);
|
||
|
|
writeString("(", sink);
|
||
|
|
writeString("name", sink);
|
||
|
|
writeString(*it, sink);
|
||
|
|
writeString("file", sink);
|
||
|
|
dumpPath(path + "/" + *it, sink);
|
||
|
|
writeString(")", sink);
|
||
|
|
}
|
||
|
|
|
||
|
|
closedir(dir); /* !!! close on exception */
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static void dumpContents(const string & path, unsigned int size,
|
||
|
|
DumpSink & sink)
|
||
|
|
{
|
||
|
|
writeString("contents", sink);
|
||
|
|
writeInt(size, sink);
|
||
|
|
|
||
|
|
int fd = open(path.c_str(), O_RDONLY);
|
||
|
|
if (!fd) throw SysError("opening file " + path);
|
||
|
|
|
||
|
|
unsigned char buf[65536];
|
||
|
|
|
||
|
|
unsigned int total = 0;
|
||
|
|
ssize_t n;
|
||
|
|
while ((n = read(fd, buf, sizeof(buf)))) {
|
||
|
|
if (n == -1) throw SysError("reading file " + path);
|
||
|
|
total += n;
|
||
|
|
sink(buf, n);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (total != size)
|
||
|
|
throw SysError("file changed while reading it: " + path);
|
||
|
|
|
||
|
|
pad(size, sink);
|
||
|
|
|
||
|
|
close(fd); /* !!! close on exception */
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
void dumpPath(const string & path, DumpSink & sink)
|
||
|
|
{
|
||
|
|
struct stat st;
|
||
|
|
if (lstat(path.c_str(), &st))
|
||
|
|
throw SysError("getting attributes of path " + path);
|
||
|
|
|
||
|
|
writeString("(", sink);
|
||
|
|
|
||
|
|
if (S_ISREG(st.st_mode)) {
|
||
|
|
writeString("type", sink);
|
||
|
|
writeString("regular", sink);
|
||
|
|
dumpContents(path, st.st_size, sink);
|
||
|
|
}
|
||
|
|
|
||
|
|
else if (S_ISDIR(st.st_mode)) {
|
||
|
|
writeString("type", sink);
|
||
|
|
writeString("directory", sink);
|
||
|
|
dumpEntries(path, sink);
|
||
|
|
}
|
||
|
|
|
||
|
|
else if (S_ISLNK(st.st_mode)) {
|
||
|
|
writeString("type", sink);
|
||
|
|
writeString("symlink", sink);
|
||
|
|
char buf[st.st_size];
|
||
|
|
if (readlink(path.c_str(), buf, st.st_size) != st.st_size)
|
||
|
|
throw SysError("reading symbolic link " + path);
|
||
|
|
writeString("target", sink);
|
||
|
|
writeString(string(buf, st.st_size), sink);
|
||
|
|
}
|
||
|
|
|
||
|
|
else throw Error("unknown file type: " + path);
|
||
|
|
|
||
|
|
writeString(")", sink);
|
||
|
|
}
|