reader.cc

   1 #include <reader.h>
   2 #include <alien.h>
   3
   4 #include <string>
   5
   6 namespace odc {
   7
   8 Reader::Reader(std::istream &rider): d_rider(rider), d_cancelled(false), d_readAlien(false), d_typeList(),
   9         d_state(new ReaderState()) {}
  10
  11 SHORTCHAR Reader::readSChar() {
  12         SHORTCHAR out;
  13         d_rider.read(&out, 1);
  14         return out;
  15 }
  16
  17 INTEGER Reader::readInt() {
  18         char *buf = new char[4];
  19         d_rider.read(buf, 4);
  20         if (isLittleEndian()) {
  21                 return *(INTEGER *)buf;
  22         } else {
  23                 char *out = new char[4];
  24                 out[0] = buf[3]; out[1] = buf[2]; out[2] = buf[1]; out[3] = buf[0];
  25                 return *(INTEGER *)out;
  26         }
  27 }
  28
  29 void Reader::readSString(SHORTCHAR *out) {
  30         while (*out = readSChar()) {
  31                 ++out;
  32         }
  33 }
  34
  35 Store* Reader::readStore() {
  36         SHORTCHAR kind = readSChar();
  37         if (kind == Store::NIL) {
  38                 return readNilStore();
  39         } else if (kind == Store::LINK) {
  40                 return readLinkStore();
  41         } else if (kind == Store::NEWLINK) {
  42                 return readNewLinkStore();
  43         } else if (kind == Store::STORE) {
  44                 return readStoreOrElemStore(false);
  45         } else if (kind == Store::ELEM) {
  46                 return readStoreOrElemStore(true);
  47         } else {
  48                 throw 20;
  49         }
  50 }
  51 //      PROCEDURE (VAR rd: Reader) ReadStore* (OUT x: Store), NEW;
  52 //              VAR a: Alien; t: Kernel.Type;
  53 //                      len, pos, pos1, id, comment, next, down, downPos, nextTypeId, nextElemId, nextStoreId: INTEGER;
  54 //                      kind: SHORTCHAR; path: TypePath; type: TypeName;
  55 //                      save: ReaderState;
  56 Store *Reader::readNilStore() {
  57         return 0;
  58 }
  59 //              IF kind = nil THEN
  60 //                      rd.ReadInt(comment); rd.ReadInt(next);
  61 //                      rd.st.end := rd.Pos();
  62 //                      IF (next > 0) OR ((next = 0) & ODD(comment)) THEN rd.st.next := rd.st.end + next ELSE rd.st.next := 0 END;
  63 //                      x := NIL
  64 Store *Reader::readLinkStore() {
  65         return 0;
  66 }
  67 //              ELSIF kind = link THEN
  68 //                      rd.ReadInt(id); rd.ReadInt(comment); rd.ReadInt(next);
  69 //                      rd.st.end := rd.Pos();
  70 //                      IF (next > 0) OR ((next = 0) & ODD(comment)) THEN rd.st.next := rd.st.end + next ELSE rd.st.next := 0 END;
  71 //                      x := ThisStore(rd.eDict, id)
  72 Store *Reader::readNewLinkStore() {
  73         return 0;
  74 }
  75 //              ELSIF kind = newlink THEN
  76 //                      rd.ReadInt(id); rd.ReadInt(comment); rd.ReadInt(next);
  77 //                      rd.st.end := rd.Pos();
  78 //                      IF (next > 0) OR ((next = 0) & ODD(comment)) THEN rd.st.next := rd.st.end + next ELSE rd.st.next := 0 END;
  79 //                      x := ThisStore(rd.sDict, id)
  80
  81 Store *Reader::readStoreOrElemStore(bool isElem) {
  82         INTEGER id = isElem ? d_elemList.size() : d_storeList.size();
  83         SHORTCHAR** path = newTypePath();
  84         readPath(path);
  85         for (int i = 0; path[i] != 0; ++i) {
  86                 std::cout << path[i] << std::endl;
  87         }
  88         SHORTCHAR* type = path[0];
  89         INTEGER comment = readInt();
  90         std::streampos pos1 = d_rider.tellg();
  91         std::streamoff next = readInt();
  92         std::streamoff down = readInt();
  93         std::streamoff len = readInt();
  94         std::streampos pos = d_rider.tellg();
  95         if (next > 0) {
  96                 d_state->next = pos1 + next + (std::streamoff)4;
  97         } else {
  98                 d_state->next = 0;
  99         }
 100         int downPos = 0;
 101         if (down > 0) {
 102                 downPos = pos1 + down + (std::streamoff)8;
 103         }
 104         d_state->end = pos + len;
 105         d_cause = 0;
 106         // FIXME: insert whole bunch of checks here
 107 //                      ASSERT(len >= 0, 101);
 108 //                      IF next # 0 THEN
 109 //                              ASSERT(rd.st.next > pos1, 102);
 110 //                              IF down # 0 THEN
 111 //                                      ASSERT(downPos < rd.st.next, 103)
 112 //                              END
 113 //                      END;
 114 //                      IF down # 0 THEN
 115 //                              ASSERT(downPos > pos1, 104);
 116 //                              ASSERT(downPos < rd.st.end, 105)
 117 //                      END;
 118
 119         void *t = 0; // FIXME type lookup here
 120         if (t != 0) {
 121 //                              x := NewStore(t); x.isElem := kind = elem
 122         } else {
 123 //                              rd.cause := thisTypeRes; AlienTypeReport(rd.cause, type);
 124 //                              x := NIL
 125         }
 126
 127         Store *x = 0;
 128         if (x != 0) { // IF READING SUCCEEDS, INSERT MORE CHECKS HERE
 129         } else {
 130 //                              rd.SetPos(pos);
 131 //                              ASSERT(rd.cause # 0, 107);
 132                 Alien *alien = new Alien(id, path); //, d_cause); //,file
 133                 if (d_store == 0) {
 134                         d_store = alien;
 135                 } else {
 136                         // join(d_store, alien)
 137                         std::cout << "Man, should have written join(.,.)" << std::endl;
 138                 }
 139                 if (isElem) {
 140                         d_elemList.push_back(alien);
 141                 } else {
 142                         d_storeList.push_back(alien);
 143                 }
 144                 ReaderState *save = d_state;
 145 //                              rd.nextTypeId := nextTypeId; rd.nextElemId := nextElemId; rd.nextStoreId := nextStoreId;
 146                 internalizeAlien(alien, downPos, save->end);
 147                 d_state = save;
 148 //                              ASSERT(rd.Pos() = rd.st.end, 108);
 149 //                              rd.cause := 0; rd.cancelled :=  FALSE; rd.readAlien := TRUE
 150                 return alien;
 151         }
 152
 153         return x;
 154 }
 155 //                      t := ThisType(type);
 156 //                      IF t # NIL THEN
 157 //                              x := NewStore(t); x.isElem := kind = elem
 158 //                      ELSE
 159 //                              rd.cause := thisTypeRes; AlienTypeReport(rd.cause, type);
 160 //                              x := NIL
 161 //                      END;
 162 //                      IF x # NIL THEN
 163 //                              IF SamePath(t, path) THEN
 164 //                                      IF kind = elem THEN
 165 //                                              x.id := id; AddStore(rd.eDict, rd.eHead, x)
 166 //                                      ELSE
 167 //                                              x.id := id; AddStore(rd.sDict, rd.sHead, x)
 168 //                                      END;
 169 //                                      save := rd.st; rd.cause := 0; rd.cancelled :=  FALSE;
 170 //                                      x.Internalize(rd);
 171 //                                      rd.st := save;
 172 //                                      IF rd.cause # 0 THEN x := NIL
 173 //                                      ELSIF (rd.Pos() # rd.st.end) OR rd.rider.eof THEN
 174 //                                              rd.cause := inconsistentVersion; AlienReport(rd.cause);
 175 //                                              x := NIL
 176 //                                      END
 177 //                              ELSE
 178 //                                      rd.cause := inconsistentType; AlienTypeReport(rd.cause, type);
 179 //                                      x := NIL
 180 //                              END
 181 //                      END;
 182 //
 183 //                      IF x # NIL THEN
 184 //                              IF rd.noDomain THEN
 185 //                                      rd.store := x;
 186 //                                      rd.noDomain := FALSE
 187 //                              ELSE
 188 //                                      Join(rd.store, x)
 189 //                              END
 190 //                      ELSE    (* x is an alien *)
 191 //                              rd.SetPos(pos);
 192 //                              ASSERT(rd.cause # 0, 107);
 193 //                              NEW(a); a.path := path; a.cause := rd.cause; a.file := rd.rider.Base();
 194 //                              IF rd.noDomain THEN
 195 //                                      rd.store := a;
 196 //                                      rd.noDomain := FALSE
 197 //                              ELSE
 198 //                                      Join(rd.store, a)
 199 //                              END;
 200 //                              IF kind = elem THEN
 201 //                                      a.id := id; AddStore(rd.eDict, rd.eHead, a)
 202 //                              ELSE
 203 //                                      a.id := id; AddStore(rd.sDict, rd.sHead, a)
 204 //                              END;
 205 //                              save := rd.st;
 206 //                              rd.nextTypeId := nextTypeId; rd.nextElemId := nextElemId; rd.nextStoreId := nextStoreId;
 207 //                              InternalizeAlien(rd, a.comps, downPos, pos, len);
 208 //                              rd.st := save;
 209 //                              x := a;
 210 //                              ASSERT(rd.Pos() = rd.st.end, 108);
 211 //                              rd.cause := 0; rd.cancelled :=  FALSE; rd.readAlien := TRUE
 212 //                      END
 213
 214
 215 void Reader::internalizeAlien(Alien *alien, std::streampos down, std::streampos end) {
 216         std::streampos next = down != 0 ? down : end;
 217         while (d_rider.tellg() < end) {
 218                 if (d_rider.tellg() < next) { // for some reason, this means its a piece (unstructured)
 219                         std::cout << "Alien Piece" << std::endl;
 220                         size_t len = next - d_rider.tellg();
 221                         char *buf = new char[len];
 222                         d_rider.read(buf, len);
 223                         AlienComponent *comp = new AlienPiece(buf, len);
 224                         alien->getComponents().push_back(comp);
 225                 } else { // that means we've got a store
 226                         std::cout << "Alien Store" << std::endl;
 227                         d_rider.seekg(next);
 228                         AlienComponent *comp = new AlienPart(readStore());
 229                         alien->getComponents().push_back(comp);
 230                         next = d_state->next > 0 ? d_state->next : end;
 231                 }
 232         }
 233 }
 234
 235 void Reader::readPath(SHORTCHAR **path) {
 236         SHORTCHAR kind = readSChar();
 237         int i;
 238         for (i = 0; kind == Store::NEWEXT; ++i) {
 239                 readSString(path[i]);
 240                 addPathComponent(i == 0, path[i]);
 241 //                      IF path[i] # elemTName THEN INC(i) END;
 242                 kind = readSChar();
 243         }
 244
 245         if (kind == Store::NEWBASE) {
 246                 readSString(path[i]);
 247                 addPathComponent(i == 0, path[i]);
 248                 ++i;
 249         } else if (kind == Store::OLDTYPE) {
 250                 int id = readInt();
 251                 d_typeList[d_typeList.size() - 1]->baseId = id;
 252 //                      REPEAT
 253 //                              GetThisType(rd.tDict, id, path[i]); id := ThisBaseId(rd.tDict, id);
 254 //                              IF path[i] # elemTName THEN INC(i) END
 255 //                      UNTIL id = -1
 256         } else {
 257                 throw 100;
 258         }
 259         path[i] = 0;
 260 }
 261 //      PROCEDURE ReadPath (VAR rd: Reader; VAR path: TypePath);
 262 //              VAR h: TypeDict; id, extId: INTEGER; i: INTEGER; kind: SHORTCHAR;
 263 //
 264 //              PROCEDURE AddPathComp (VAR rd: Reader);
 265 //              BEGIN
 266 //                      IF h # NIL THEN AddBaseId(h, extId, rd.nextTypeId) END;
 267 //                      AddType(rd.tDict, rd.tHead, rd.nextTypeId, path[i]);
 268 //                      h := rd.tHead; extId := rd.nextTypeId
 269 //              END AddPathComp;
 270 //
 271 //      BEGIN
 272 //              h := NIL; i := 0; rd.ReadSChar(kind);
 273 //              WHILE kind = newExt DO
 274 //                      rd.ReadXString(path[i]);
 275 //                      AddPathComp(rd); INC(rd.nextTypeId);
 276 //                      IF path[i] # elemTName THEN INC(i) END;
 277 //                      rd.ReadSChar(kind)
 278 //              END;
 279 //              IF kind = newBase THEN
 280 //                      rd.ReadXString(path[i]);
 281 //                      AddPathComp(rd); INC(rd.nextTypeId); INC(i)
 282 //              ELSE
 283 //                      ASSERT(kind = oldType, 100);
 284 //                      rd.ReadInt(id);
 285 //                      IF h # NIL THEN AddBaseId(h, extId, id) END;
 286 //                      REPEAT
 287 //                              GetThisType(rd.tDict, id, path[i]); id := ThisBaseId(rd.tDict, id);
 288 //                              IF path[i] # elemTName THEN INC(i) END
 289 //                      UNTIL id = -1
 290 //              END;
 291 //              path[i] := ""
 292 //      END ReadPath;
 293
 294 void Reader::addPathComponent(bool first, SHORTCHAR *typeName) {
 295         int next = d_typeList.size();
 296         int curr = next - 1;
 297         if (!first) {
 298                 d_typeList[curr]->baseId = next;
 299         }
 300         d_typeList.push_back(new TypeEntry(typeName));
 301 }
 302
 303 } // namespace odc