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