-}
- /*}}}*/
-bool RredMethod::Fetch(FetchItem *Itm) /*{{{*/
-{
- Debug = _config->FindB("Debug::pkgAcquire::RRed", false);
- URI Get = Itm->Uri;
- std::string Path = Get.Host + Get.Path; // To account for relative paths
-
- FetchResult Res;
- Res.Filename = Itm->DestFile;
- if (Itm->Uri.empty() == true) {
- Path = Itm->DestFile;
- Itm->DestFile.append(".result");
- } else
- URIStart(Res);
-
- if (Debug == true)
- std::clog << "Patching " << Path << " with " << Path
- << ".ed and putting result into " << Itm->DestFile << std::endl;
- // Open the source and destination files (the d'tor of FileFd will do
- // the cleanup/closing of the fds)
- FileFd From(Path,FileFd::ReadOnly);
- FileFd Patch(Path+".ed",FileFd::ReadOnlyGzip);
- FileFd To(Itm->DestFile,FileFd::WriteAtomic);
- To.EraseOnFailure();
- if (_error->PendingError() == true)
- return false;
-
- Hashes Hash;
- // now do the actual patching
- State const result = patchMMap(Patch, From, To, &Hash);
- if (result == MMAP_FAILED) {
- // retry with patchFile
- Patch.Seek(0);
- From.Seek(0);
- To.Open(Itm->DestFile,FileFd::WriteAtomic);
- if (_error->PendingError() == true)
- return false;
- if (patchFile(Patch, From, To, &Hash) != ED_OK) {
- return _error->WarningE("rred", _("Could not patch %s with mmap and with file operation usage - the patch seems to be corrupt."), Path.c_str());
- } else if (Debug == true) {
- std::clog << "rred: finished file patching of " << Path << " after mmap failed." << std::endl;
+ }
+
+ public:
+ FileChanges() {
+ where = changes.end();
+ pos = 0;
+ }
+
+ std::list<struct Change>::iterator begin(void) { return changes.begin(); }
+ std::list<struct Change>::iterator end(void) { return changes.end(); }
+
+ std::list<struct Change>::reverse_iterator rbegin(void) { return changes.rbegin(); }
+ std::list<struct Change>::reverse_iterator rend(void) { return changes.rend(); }
+
+ void add_change(Change c) {
+ assert(pos_is_okay());
+ go_to_change_for(c.offset);
+ assert(pos + where->offset == c.offset);
+ if (c.del_cnt > 0)
+ delete_lines(c.del_cnt);
+ assert(pos + where->offset == c.offset);
+ if (c.add_len > 0) {
+ assert(pos_is_okay());
+ if (where->add_len > 0)
+ new_change();
+ assert(where->add_len == 0 && where->add_cnt == 0);
+
+ where->add_len = c.add_len;
+ where->add_cnt = c.add_cnt;
+ where->add = c.add;
+ }
+ assert(pos_is_okay());
+ merge();
+ assert(pos_is_okay());
+ }
+
+ private:
+ void merge(void)
+ {
+ while (where->offset == 0 && where != changes.begin()) {
+ left();
+ }
+ std::list<struct Change>::iterator next = where;
+ next++;
+
+ while (next != changes.end() && next->offset == 0) {
+ where->del_cnt += next->del_cnt;
+ next->del_cnt = 0;
+ if (next->add == NULL) {
+ next = changes.erase(next);
+ } else if (where->add == NULL) {
+ where->add = next->add;
+ where->add_len = next->add_len;
+ where->add_cnt = next->add_cnt;
+ next = changes.erase(next);
+ } else {
+ next++;
+ }
+ }
+ }
+
+ 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());
+ }
+
+ size_t check_next_offset(size_t max)
+ {
+ assert(pos_is_okay());
+ if (max > 0)
+ {
+ where++;
+ if (where != changes.end()) {
+ if (where->offset < max)
+ max = where->offset;
+ }
+ where--;
+ assert(pos_is_okay());
+ }
+ return max;
+ }
+
+ 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 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))) {
+ fwrite(buffer, 1, l, o);
+ if (hash)
+ hash->Add((unsigned char*)buffer, l);
+ }
+ }
+
+ static void dump_lines(FILE *o, FILE *i, size_t n, Hashes *hash)
+ {
+ char buffer[BLOCK_SIZE];
+ size_t l;
+ while (n > 0) {
+ if (fgets(buffer, sizeof(buffer), i) == 0)
+ buffer[0] = '\0';
+ l = strlen(buffer);
+ if (l == 0 || buffer[l-1] == '\n')
+ n--;
+ fwrite(buffer, 1, l, o);
+
+ if (hash)
+ hash->Add((unsigned char*)buffer, l);
+ }
+ }
+
+ static void skip_lines(FILE *i, int n)
+ {
+ char buffer[BLOCK_SIZE];
+ size_t l;
+ while (n > 0) {
+ if (fgets(buffer, sizeof(buffer), i) == 0)
+ buffer[0] = '\0';
+ l = strlen(buffer);
+ if (l == 0 || buffer[l-1] == '\n')
+ n--;
+ }
+ }
+
+ static bool dump_mem(FILE *o, char *p, size_t s, Hashes *hash) {
+ size_t r;
+ while (s > 0) {
+ r = fwrite(p, 1, s, o);
+ if (hash)
+ hash->Add((unsigned char*)p, s);
+ s -= r;
+ p += r;
+ if (r == 0) return false;
+ }
+ return true;
+ }
+
+ public:
+
+ void read_diff(FILE *f)
+ {
+ char buffer[BLOCK_SIZE];
+ bool cmdwanted = true;
+
+ Change ch(0);
+ while(fgets(buffer, sizeof(buffer), f))
+ {
+ 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 { /* !cmdwaanted */
+ 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)
+ {
+ size_t 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, "%lua\n", line);
+ } else if (ch->del_cnt == 1) {
+ fprintf(f, "%luc\n", line+1);
+ } else {
+ fprintf(f, "%lu,%luc\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, "%lud\n", line+1);
+ } else if (ch->del_cnt > 1) {
+ fprintf(f, "%lu,%lud\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);
projects / apt.git / blobdiff