+
+class Patch {
+ FileChanges filechanges;
+ MemBlock add_text;
+
+ static bool retry_fwrite(char *b, size_t l, FileFd &f, Hashes * const start_hash, Hashes * const end_hash = nullptr) APT_NONNULL(1)
+ {
+ if (f.Write(b, l) == false)
+ return false;
+ if (start_hash)
+ start_hash->Add((unsigned char*)b, l);
+ if (end_hash)
+ end_hash->Add((unsigned char*)b, l);
+ return true;
+ }
+
+ static void dump_rest(FileFd &o, FileFd &i,
+ Hashes * const start_hash, Hashes * const end_hash)
+ {
+ char buffer[BLOCK_SIZE];
+ unsigned long long l = 0;
+ while (i.Read(buffer, sizeof(buffer), &l)) {
+ if (l ==0 || !retry_fwrite(buffer, l, o, start_hash, end_hash))
+ break;
+ }
+ }
+
+ static void dump_lines(FileFd &o, FileFd &i, size_t n,
+ Hashes * const start_hash, Hashes * const end_hash)
+ {
+ char buffer[BLOCK_SIZE];
+ while (n > 0) {
+ if (i.ReadLine(buffer, sizeof(buffer)) == NULL)
+ buffer[0] = '\0';
+ size_t const l = strlen(buffer);
+ if (l == 0 || buffer[l-1] == '\n')
+ n--;
+ retry_fwrite(buffer, l, o, start_hash, end_hash);
+ }
+ }
+
+ static void skip_lines(FileFd &i, int n, Hashes * const start_hash)
+ {
+ char buffer[BLOCK_SIZE];
+ while (n > 0) {
+ if (i.ReadLine(buffer, sizeof(buffer)) == NULL)
+ buffer[0] = '\0';
+ size_t const l = strlen(buffer);
+ if (l == 0 || buffer[l-1] == '\n')
+ n--;
+ if (start_hash)
+ start_hash->Add((unsigned char*)buffer, l);
+ }
+ }
+
+ static void dump_mem(FileFd &o, char *p, size_t s, Hashes *hash) APT_NONNULL(2) {
+ retry_fwrite(p, s, o, nullptr, hash);
+ }
+
+ public:
+
+ bool read_diff(FileFd &f, Hashes * const h)
+ {
+ char buffer[BLOCK_SIZE];
+ bool cmdwanted = true;
+
+ Change ch(std::numeric_limits<size_t>::max());
+ if (f.ReadLine(buffer, sizeof(buffer)) == NULL)
+ return _error->Error("Reading first line of patchfile %s failed", f.Name().c_str());
+ do {
+ if (h != NULL)
+ h->Add(buffer);
+ if (cmdwanted) {
+ char *m, *c;
+ size_t s, e;
+ errno = 0;
+ s = strtoul(buffer, &m, 10);
+ if (unlikely(m == buffer || s == std::numeric_limits<unsigned long>::max() || errno != 0))
+ return _error->Error("Parsing patchfile %s failed: Expected an effected line start", f.Name().c_str());
+ else if (*m == ',') {
+ ++m;
+ e = strtol(m, &c, 10);
+ if (unlikely(m == c || e == std::numeric_limits<unsigned long>::max() || errno != 0))
+ return _error->Error("Parsing patchfile %s failed: Expected an effected line end", f.Name().c_str());
+ if (unlikely(e < s))
+ return _error->Error("Parsing patchfile %s failed: Effected lines end %lu is before start %lu", f.Name().c_str(), e, s);
+ } else {
+ e = s;
+ c = m;
+ }
+ if (s > ch.offset)
+ return _error->Error("Parsing patchfile %s failed: Effected line is after previous effected line", f.Name().c_str());
+ switch(*c) {
+ case 'a':
+ cmdwanted = false;
+ ch.add = NULL;
+ ch.add_cnt = 0;
+ ch.add_len = 0;
+ ch.offset = s;
+ ch.del_cnt = 0;
+ break;
+ case 'c':
+ if (unlikely(s == 0))
+ return _error->Error("Parsing patchfile %s failed: Change command can't effect line zero", f.Name().c_str());
+ cmdwanted = false;
+ ch.add = NULL;
+ ch.add_cnt = 0;
+ ch.add_len = 0;
+ ch.offset = s - 1;
+ ch.del_cnt = e - s + 1;
+ break;
+ case 'd':
+ if (unlikely(s == 0))
+ return _error->Error("Parsing patchfile %s failed: Delete command can't effect line zero", f.Name().c_str());
+ ch.offset = s - 1;
+ ch.del_cnt = e - s + 1;
+ ch.add = NULL;
+ ch.add_cnt = 0;
+ ch.add_len = 0;
+ filechanges.add_change(ch);
+ break;
+ default:
+ return _error->Error("Parsing patchfile %s failed: Unknown command", f.Name().c_str());
+ }
+ } else { /* !cmdwanted */
+ if (strcmp(buffer, ".\n") == 0) {
+ cmdwanted = true;
+ filechanges.add_change(ch);
+ } else {
+ char *last = NULL;
+ char *add;
+ size_t l;
+ if (ch.add)
+ last = ch.add + ch.add_len;
+ l = strlen(buffer);
+ add = add_text.add_easy(buffer, l, last);
+ if (!add) {
+ ch.add_len += l;
+ ch.add_cnt++;
+ } else {
+ if (ch.add) {
+ filechanges.add_change(ch);
+ ch.del_cnt = 0;
+ }
+ ch.offset += ch.add_cnt;
+ ch.add = add;
+ ch.add_len = l;
+ ch.add_cnt = 1;
+ }
+ }
+ }
+ } while(f.ReadLine(buffer, sizeof(buffer)));
+ return true;
+ }
+
+ void write_diff(FileFd &f)
+ {
+ unsigned long long line = 0;
+ std::list<struct Change>::reverse_iterator ch;
+ for (ch = filechanges.rbegin(); ch != filechanges.rend(); ++ch) {
+ line += ch->offset + ch->del_cnt;
+ }
+
+ for (ch = filechanges.rbegin(); ch != filechanges.rend(); ++ch) {
+ std::list<struct Change>::reverse_iterator mg_i, mg_e = ch;
+ while (ch->del_cnt == 0 && ch->offset == 0)
+ {
+ ++ch;
+ if (unlikely(ch == filechanges.rend()))
+ return;
+ }
+ line -= ch->del_cnt;
+ std::string buf;
+ if (ch->add_cnt > 0) {
+ if (ch->del_cnt == 0) {
+ strprintf(buf, "%llua\n", line);
+ } else if (ch->del_cnt == 1) {
+ strprintf(buf, "%lluc\n", line+1);
+ } else {
+ strprintf(buf, "%llu,%lluc\n", line+1, line+ch->del_cnt);
+ }
+ f.Write(buf.c_str(), buf.length());
+
+ mg_i = ch;
+ do {
+ dump_mem(f, mg_i->add, mg_i->add_len, NULL);
+ } while (mg_i-- != mg_e);
+
+ buf = ".\n";
+ f.Write(buf.c_str(), buf.length());
+ } else if (ch->del_cnt == 1) {
+ strprintf(buf, "%llud\n", line+1);
+ f.Write(buf.c_str(), buf.length());
+ } else if (ch->del_cnt > 1) {
+ strprintf(buf, "%llu,%llud\n", line+1, line+ch->del_cnt);
+ f.Write(buf.c_str(), buf.length());
+ }
+ line -= ch->offset;
+ }
+ }
+
+ void apply_against_file(FileFd &out, FileFd &in,
+ Hashes * const start_hash = nullptr, Hashes * const end_hash = nullptr)
+ {
+ std::list<struct Change>::iterator ch;
+ for (ch = filechanges.begin(); ch != filechanges.end(); ++ch) {
+ dump_lines(out, in, ch->offset, start_hash, end_hash);
+ skip_lines(in, ch->del_cnt, start_hash);
+ if (ch->add_len != 0)
+ dump_mem(out, ch->add, ch->add_len, end_hash);
+ }
+ dump_rest(out, in, start_hash, end_hash);
+ out.Flush();
+ }
+};
+
+class RredMethod : public aptMethod {
+ private:
+ bool Debug;
+
+ struct PDiffFile {
+ std::string FileName;
+ HashStringList ExpectedHashes;
+ PDiffFile(std::string const &FileName, HashStringList const &ExpectedHashes) :
+ FileName(FileName), ExpectedHashes(ExpectedHashes) {}
+ };
+
+ HashStringList ReadExpectedHashesForPatch(unsigned int const patch, std::string const &Message)
+ {
+ HashStringList ExpectedHashes;
+ for (char const * const * type = HashString::SupportedHashes(); *type != NULL; ++type)
+ {
+ std::string tagname;
+ strprintf(tagname, "Patch-%d-%s-Hash", patch, *type);
+ std::string const hashsum = LookupTag(Message, tagname.c_str());
+ if (hashsum.empty() == false)
+ ExpectedHashes.push_back(HashString(*type, hashsum));
+ }
+ return ExpectedHashes;
+ }
+
+ protected:
+ virtual bool URIAcquire(std::string const &Message, FetchItem *Itm) APT_OVERRIDE {
+ Debug = DebugEnabled();
+ URI Get = Itm->Uri;
+ std::string Path = Get.Host + Get.Path; // rred:/path - no host
+
+ FetchResult Res;
+ Res.Filename = Itm->DestFile;
+ if (Itm->Uri.empty())
+ {
+ Path = Itm->DestFile;
+ Itm->DestFile.append(".result");
+ } else
+ URIStart(Res);
+
+ std::vector<PDiffFile> patchfiles;
+ Patch patch;
+
+ HashStringList StartHashes;
+ for (char const * const * type = HashString::SupportedHashes(); *type != nullptr; ++type)
+ {
+ std::string tagname;
+ strprintf(tagname, "Start-%s-Hash", *type);
+ std::string const hashsum = LookupTag(Message, tagname.c_str());
+ if (hashsum.empty() == false)
+ StartHashes.push_back(HashString(*type, hashsum));
+ }
+
+ if (FileExists(Path + ".ed") == true)
+ {
+ HashStringList const ExpectedHashes = ReadExpectedHashesForPatch(0, Message);
+ std::string const FileName = Path + ".ed";
+ if (ExpectedHashes.usable() == false)
+ return _error->Error("No hashes found for uncompressed patch: %s", FileName.c_str());
+ patchfiles.push_back(PDiffFile(FileName, ExpectedHashes));
+ }
+ else
+ {
+ _error->PushToStack();
+ std::vector<std::string> patches = GetListOfFilesInDir(flNotFile(Path), "gz", true, false);
+ _error->RevertToStack();
+
+ std::string const baseName = Path + ".ed.";
+ unsigned int seen_patches = 0;
+ for (std::vector<std::string>::const_iterator p = patches.begin();
+ p != patches.end(); ++p)
+ {
+ if (p->compare(0, baseName.length(), baseName) == 0)
+ {
+ HashStringList const ExpectedHashes = ReadExpectedHashesForPatch(seen_patches, Message);
+ if (ExpectedHashes.usable() == false)
+ return _error->Error("No hashes found for uncompressed patch %d: %s", seen_patches, p->c_str());
+ patchfiles.push_back(PDiffFile(*p, ExpectedHashes));
+ ++seen_patches;
+ }
+ }
+ }
+
+ std::string patch_name;
+ for (std::vector<PDiffFile>::iterator I = patchfiles.begin();
+ I != patchfiles.end();
+ ++I)
+ {
+ patch_name = I->FileName;
+ if (Debug == true)
+ std::clog << "Patching " << Path << " with " << patch_name
+ << std::endl;
+
+ FileFd p;
+ Hashes patch_hash(I->ExpectedHashes);
+ // all patches are compressed, even if the name doesn't reflect it
+ if (p.Open(patch_name, FileFd::ReadOnly, FileFd::Gzip) == false ||
+ patch.read_diff(p, &patch_hash) == false)
+ {
+ _error->DumpErrors(std::cerr, GlobalError::DEBUG, false);
+ return false;
+ }
+ p.Close();
+ HashStringList const hsl = patch_hash.GetHashStringList();
+ if (hsl != I->ExpectedHashes)
+ return _error->Error("Hash Sum mismatch for uncompressed patch %s", patch_name.c_str());
+ }
+
+ if (Debug == true)
+ std::clog << "Applying patches against " << Path
+ << " and writing results to " << Itm->DestFile
+ << std::endl;
+
+ FileFd inp, out;
+ if (inp.Open(Path, FileFd::ReadOnly, FileFd::Extension) == false)
+ {
+ std::cerr << "FAILED to open inp " << Path << std::endl;
+ return _error->Error("Failed to open inp %s", Path.c_str());
+ }
+ if (out.Open(Itm->DestFile, FileFd::WriteOnly | FileFd::Create | FileFd::Empty | FileFd::BufferedWrite, FileFd::Extension) == false)
+ {
+ std::cerr << "FAILED to open out " << Itm->DestFile << std::endl;
+ return _error->Error("Failed to open out %s", Itm->DestFile.c_str());
+ }
+
+ Hashes end_hash(Itm->ExpectedHashes);
+ if (StartHashes.usable())
+ {
+ Hashes start_hash(StartHashes);
+ patch.apply_against_file(out, inp, &start_hash, &end_hash);
+ if (start_hash.GetHashStringList() != StartHashes)
+ _error->Error("The input file hadn't the expected hash!");
+ }
+ else
+ patch.apply_against_file(out, inp, nullptr, &end_hash);
+
+ out.Close();
+ inp.Close();
+
+ if (_error->PendingError() == true) {
+ std::cerr << "FAILED to read or write files" << std::endl;
+ return false;
+ }
+
+ if (Debug == true) {
+ std::clog << "rred: finished file patching of " << Path << "." << std::endl;
+ }
+
+ struct stat bufbase, bufpatch;
+ if (stat(Path.c_str(), &bufbase) != 0 ||
+ stat(patch_name.c_str(), &bufpatch) != 0)
+ return _error->Errno("stat", _("Failed to stat %s"), Path.c_str());
+
+ struct timeval times[2];
+ times[0].tv_sec = bufbase.st_atime;
+ times[1].tv_sec = bufpatch.st_mtime;
+ times[0].tv_usec = times[1].tv_usec = 0;
+ if (utimes(Itm->DestFile.c_str(), times) != 0)
+ return _error->Errno("utimes",_("Failed to set modification time"));
+
+ if (stat(Itm->DestFile.c_str(), &bufbase) != 0)
+ return _error->Errno("stat", _("Failed to stat %s"), Itm->DestFile.c_str());
+
+ Res.LastModified = bufbase.st_mtime;
+ Res.Size = bufbase.st_size;
+ Res.TakeHashes(end_hash);
+ URIDone(Res);
+
+ return true;
+ }
+
+ public:
+ RredMethod() : aptMethod("rred", "2.0", SendConfig), Debug(false) {}
+};
+
+int main(int argc, char **argv)
+{
+ int i;
+ bool just_diff = true;
+ bool test = false;
+ Patch patch;
+
+ if (argc <= 1) {
+ return RredMethod().Run();
+ }
+
+ // Usage: rred -t input output diff ...
+ if (argc > 1 && strcmp(argv[1], "-t") == 0) {
+ // Read config files so we see compressors.
+ pkgInitConfig(*_config);
+ just_diff = false;
+ test = true;
+ i = 4;
+ } else if (argc > 1 && strcmp(argv[1], "-f") == 0) {
+ just_diff = false;
+ i = 2;
+ } else {
+ i = 1;
+ }
+
+ for (; i < argc; i++) {
+ FileFd p;
+ if (p.Open(argv[i], FileFd::ReadOnly) == false) {
+ _error->DumpErrors(std::cerr);
+ exit(1);
+ }
+ if (patch.read_diff(p, NULL) == false)
+ {
+ _error->DumpErrors(std::cerr);
+ exit(2);
+ }
+ }
+
+ if (test) {
+ FileFd out, inp;
+ std::cerr << "Patching " << argv[2] << " into " << argv[3] << "\n";
+ inp.Open(argv[2], FileFd::ReadOnly,FileFd::Extension);
+ out.Open(argv[3], FileFd::WriteOnly | FileFd::Create | FileFd::Empty | FileFd::BufferedWrite, FileFd::Extension);
+ patch.apply_against_file(out, inp);
+ out.Close();
+ } else if (just_diff) {
+ FileFd out;
+ out.OpenDescriptor(STDOUT_FILENO, FileFd::WriteOnly | FileFd::Create);
+ patch.write_diff(out);
+ out.Close();
+ } else {
+ FileFd out, inp;
+ out.OpenDescriptor(STDOUT_FILENO, FileFd::WriteOnly | FileFd::Create | FileFd::BufferedWrite);
+ inp.OpenDescriptor(STDIN_FILENO, FileFd::ReadOnly);
+ patch.apply_against_file(out, inp);
+ out.Close();
+ }
+ return 0;
projects / apt.git / blobdiff