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