Apple-2-SW/dot_clean
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do it?

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This commit is contained in:
Kelvin Sherlock 2016-08-03 20:27:44 -04:00
parent fe29929574
commit e09ce3834b
1 changed files with 84 additions and 1 deletions
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85
dot_clean.cpp
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@ -43,6 +43,10 @@ void throw_damaged_file() {
throw std::runtime_error("File is damaged.");
}
void throw_not_apple_double() {
throw std::runtime_error("Not an Apple Double File");
}
void throw_eof() {
throw std::runtime_error("Unexpected end of file.");
}
@ -87,12 +91,91 @@ void one_file(const std::string &data, const std::string &rsrc) noexcept try {
if (errno == ENOENT && _n) { unlink_list.push_back(rsrc); return; }
throw_errno();
}
defer close_fd([fd]{close(fd); });
mapped_file mf(rsrc, mapped_file::priv);
if (mf.size() < sizeof(ASHeader)) throw_not_apple_double();
ASHeader *header = (ASHeader *)mf.data();
header->magicNum = ntohl(header->magicNum);
header->versionNum = ntohl(header->versionNum);
header->numEntries = ntohs(header->numEntries);
if (header->magicNum != APPLEDOUBLE_CIGAM || header->versionNum != 0x00020000)
throw_not_apple_double();
if (header->numEntries * sizeof(ASEntry) + sizeof(ASHeader) > mf.size()) throw_eof();
ASEntry *begin = (ASEntry *)(mf.data() + sizeof(ASHeader));
ASEntry *end = &begin[header->numEntries];
std::for_each(begin, end, [&mf](ASEntry &e){
e.entryID = ntohl(e.entryID);
e.entryOffset = ntohl(e.entryOffset);
e.entryLength = ntohl(e.entryLength);
// and check for truncation.
if (!e.entryLength) return;
if (e.entryOffset > mf.size()) throw_eof();
if (e.entryOffset + e.entryLength > mf.size()) throw_eof();
});
for (auto iter = begin; iter != end; ++iter) {
const auto &e = *iter;
if (e.entryLength == 0) continue;
switch(e.entryID) {
#if 0
/* should not exist for apple double! */
case AS_DATA: {
ssize_t ok = write(fd, mf.data() + e.entryOffset, e.entryLength);
if (ok < 0) throw_errno();
//if (ok != e.entryLength) return -1;
break;
}
#endif
case AS_RESOURCE: {
#ifdef __sun__
int rfd = openat(fd, "com.apple.ResourceFork", O_XATTR | O_CREAT | O_TRUNC | O_WRONLY, 0666);
if (rfds < 0) throw_errno("com.apple.ResourceFork");
defer close_fd([rfd](){ close(rfd); });
ssize_t ok = write(rfd, mf.data() + e.entryOffset, e.entryLength);
if (ok < 0) throw_errno("com.apple.ResourceFork");
//if (ok != e.entryLength) return -1;
#endif
break;
}
case AS_FINDERINFO: {
if (e.entryLength != 32) {
fputs("Warning: Invalid Finder Info size.\n", stderr);
break;
}
#ifdef __sun__
int rfd = openat(fd, "com.apple.FinderInfo", O_XATTR | O_CREAT | O_TRUNC | O_WRONLY, 0666);
if (rfd < 0) throw_errno("com.apple.ResourceFork");
defer close_fd([rfd](){ close(rfd); });
ssize_t ok = write(rfd, mf.data() + e.entryOffset, e.entryLength);
if (ok < 0) throw_errno("com.apple.FinderInfo");
//if (ok != e.entryLength) return -1;
#endif
break;
}
}
}
if (!_p) unlink_list.push_back(rsrc);
} catch (std::exception &ex) {