+ void go_to_change_for(size_t line)
+ {
+ while(where != changes.end()) {
+ if (line < pos) {
+ left();
+ continue;
+ }
+ if (pos + where->offset + where->add_cnt <= line) {
+ right();
+ continue;
+ }
+ // line is somewhere in this slot
+ if (line < pos + where->offset) {
+ break;
+ } else if (line == pos + where->offset) {
+ return;
+ } else {
+ split(line - pos);
+ right();
+ return;
+ }
+ }
+ /* it goes before this patch */
+ insert(line-pos);
+ }
+
+ void new_change(void) { insert(where->offset); }
+
+ void insert(size_t offset)
+ {
+ assert(pos_is_okay());
+ assert(where == changes.end() || offset <= where->offset);
+ if (where != changes.end())
+ where->offset -= offset;
+ changes.insert(where, Change(offset));
+ --where;
+ assert(pos_is_okay());
+ }
+
+ void split(size_t offset)
+ {
+ assert(pos_is_okay());
+
+ assert(where->offset < offset);
+ assert(offset < where->offset + where->add_cnt);
+
+ size_t keep_lines = offset - where->offset;
+
+ Change before(*where);
+
+ where->del_cnt = 0;
+ where->offset = 0;
+ where->skip_lines(keep_lines);
+
+ before.add_cnt = keep_lines;
+ before.add_len -= where->add_len;
+
+ changes.insert(where, before);
+ --where;
+ assert(pos_is_okay());
+ }
+
+ void delete_lines(size_t cnt)
+ {
+ std::list<struct Change>::iterator x = where;
+ assert(pos_is_okay());
+ while (cnt > 0)
+ {
+ size_t del;
+ del = x->add_cnt;
+ if (del > cnt)
+ del = cnt;
+ x->skip_lines(del);
+ cnt -= del;
+
+ ++x;
+ if (x == changes.end()) {
+ del = cnt;
+ } else {
+ del = x->offset;
+ if (del > cnt)
+ del = cnt;
+ x->offset -= del;
+ }
+ where->del_cnt += del;
+ cnt -= del;
+ }
+ assert(pos_is_okay());
+ }
+
+ void left(void) {
+ assert(pos_is_okay());
+ --where;
+ pos -= where->offset + where->add_cnt;
+ assert(pos_is_okay());
+ }
+
+ void right(void) {
+ assert(pos_is_okay());
+ pos += where->offset + where->add_cnt;
+ ++where;
+ assert(pos_is_okay());
+ }
+};
+
+class Patch {
+ FileChanges filechanges;
+ MemBlock add_text;
+
+ static bool retry_fwrite(char *b, size_t l, FILE *f, Hashes *hash)
+ {
+ size_t r = 1;
+ while (r > 0 && l > 0)
+ {
+ r = fwrite(b, 1, l, f);
+ if (hash)
+ hash->Add((unsigned char*)b, r);
+ l -= r;
+ b += r;
+ }
+ return l == 0;
+ }
+
+ static void dump_rest(FILE *o, FILE *i, Hashes *hash)
+ {
+ char buffer[BLOCK_SIZE];
+ size_t l;
+ while (0 < (l = fread(buffer, 1, sizeof(buffer), i))) {
+ if (!retry_fwrite(buffer, l, o, hash))
+ break;
+ }
+ }
+
+ static void dump_lines(FILE *o, FILE *i, size_t n, Hashes *hash)
+ {
+ char buffer[BLOCK_SIZE];
+ while (n > 0) {
+ if (fgets(buffer, sizeof(buffer), i) == 0)
+ buffer[0] = '\0';
+ size_t const l = strlen(buffer);
+ if (l == 0 || buffer[l-1] == '\n')
+ n--;
+ retry_fwrite(buffer, l, o, hash);
+ }
+ }
+
+ static void skip_lines(FILE *i, int n)
+ {
+ char buffer[BLOCK_SIZE];
+ while (n > 0) {
+ if (fgets(buffer, sizeof(buffer), i) == 0)
+ buffer[0] = '\0';
+ size_t const l = strlen(buffer);
+ if (l == 0 || buffer[l-1] == '\n')
+ n--;
+ }
+ }
+
+ static void dump_mem(FILE *o, char *p, size_t s, Hashes *hash) {
+ retry_fwrite(p, s, o, hash);
+ }
+
+ public:
+
+ void read_diff(FileFd &f)
+ {
+ char buffer[BLOCK_SIZE];
+ bool cmdwanted = true;
+
+ Change ch(0);
+ while(f.ReadLine(buffer, sizeof(buffer)))
+ {
+ if (cmdwanted) {
+ char *m, *c;
+ size_t s, e;
+ s = strtol(buffer, &m, 10);
+ if (m == buffer) {
+ s = e = ch.offset + ch.add_cnt;
+ c = buffer;
+ } else if (*m == ',') {
+ m++;
+ e = strtol(m, &c, 10);
+ } else {
+ e = s;
+ c = m;
+ }
+ 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':
+ 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':
+ 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;
+ }
+ } else { /* !cmdwanted */
+ if (buffer[0] == '.' && buffer[1] == '\n') {
+ 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;
+ }
+ }
+ }
+ }
+ }
+
+ void write_diff(FILE *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;
+ line -= ch->del_cnt;
+ if (ch->add_cnt > 0) {
+ if (ch->del_cnt == 0) {
+ fprintf(f, "%llua\n", line);
+ } else if (ch->del_cnt == 1) {
+ fprintf(f, "%lluc\n", line+1);
+ } else {
+ fprintf(f, "%llu,%lluc\n", line+1, line+ch->del_cnt);
+ }
+
+ mg_i = ch;
+ do {
+ dump_mem(f, mg_i->add, mg_i->add_len, NULL);
+ } while (mg_i-- != mg_e);
+
+ fprintf(f, ".\n");
+ } else if (ch->del_cnt == 1) {
+ fprintf(f, "%llud\n", line+1);
+ } else if (ch->del_cnt > 1) {
+ fprintf(f, "%llu,%llud\n", line+1, line+ch->del_cnt);
+ }
+ line -= ch->offset;
+ }
+ }
+
+ void apply_against_file(FILE *out, FILE *in, Hashes *hash = NULL)
+ {
+ std::list<struct Change>::iterator ch;
+ for (ch = filechanges.begin(); ch != filechanges.end(); ++ch) {
+ dump_lines(out, in, ch->offset, hash);
+ skip_lines(in, ch->del_cnt);
+ dump_mem(out, ch->add, ch->add_len, hash);
+ }
+ dump_rest(out, in, hash);
+ }
+};
+
+class RredMethod : public pkgAcqMethod {
+ private:
+ bool Debug;
+
+ protected:
+ virtual bool Fetch(FetchItem *Itm) {
+ Debug = _config->FindB("Debug::pkgAcquire::RRed", false);
+ 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<std::string> patchpaths;
+ Patch patch;
+
+ if (FileExists(Path + ".ed") == true)
+ patchpaths.push_back(Path + ".ed");
+ else
+ {
+ _error->PushToStack();
+ std::vector<std::string> patches = GetListOfFilesInDir(flNotFile(Path), "gz", true, false);
+ _error->RevertToStack();
+
+ std::string const baseName = Path + ".ed.";
+ for (std::vector<std::string>::const_iterator p = patches.begin();
+ p != patches.end(); ++p)
+ if (p->compare(0, baseName.length(), baseName) == 0)
+ patchpaths.push_back(*p);
+ }
+
+ std::string patch_name;
+ for (std::vector<std::string>::iterator I = patchpaths.begin();
+ I != patchpaths.end();
+ ++I)
+ {
+ patch_name = *I;
+ if (Debug == true)
+ std::clog << "Patching " << Path << " with " << patch_name
+ << std::endl;
+
+ FileFd p;
+ // all patches are compressed, even if the name doesn't reflect it
+ if (p.Open(patch_name, FileFd::ReadOnly, FileFd::Gzip) == false) {
+ std::cerr << "Could not open patch file " << patch_name << std::endl;
+ _error->DumpErrors(std::cerr);
+ abort();
+ }
+ patch.read_diff(p);
+ p.Close();
+ }
+
+ if (Debug == true)
+ std::clog << "Applying patches against " << Path
+ << " and writing results to " << Itm->DestFile
+ << std::endl;
+
+ FILE *inp = fopen(Path.c_str(), "r");
+ FILE *out = fopen(Itm->DestFile.c_str(), "w");
+
+ Hashes hash;
+
+ patch.apply_against_file(out, inp, &hash);
+
+ fclose(out);
+ fclose(inp);
+
+ 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"));
+
+ 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"));
+
+ Res.LastModified = bufbase.st_mtime;
+ Res.Size = bufbase.st_size;
+ Res.TakeHashes(hash);
+ URIDone(Res);
+
+ return true;
+ }
+
+ public:
+ RredMethod() : pkgAcqMethod("2.0",SingleInstance | SendConfig), Debug(false) {}
projects / apt.git / blobdiff