1105 // Let's do some extra verification, we don't care about the
1106 // performance in this situation.
1107 byte[] sbuf = new byte[4];
1108 long cenpos = end.endpos - end.cenlen;
1109 long locpos = cenpos - end.cenoff;
1110 if (cenpos < 0 ||
1111 locpos < 0 ||
1112 readFullyAt(sbuf, 0, sbuf.length, cenpos) != 4 ||
1113 GETSIG(sbuf) != CENSIG ||
1114 readFullyAt(sbuf, 0, sbuf.length, locpos) != 4 ||
1115 GETSIG(sbuf) != LOCSIG) {
1116 continue;
1117 }
1118 }
1119 if (comlen > 0) { // this zip file has comlen
1120 comment = new byte[comlen];
1121 if (readFullyAt(comment, 0, comlen, end.endpos + ENDHDR) != comlen) {
1122 zerror("zip comment read failed");
1123 }
1124 }
1125 if (end.cenlen == ZIP64_MAGICVAL ||
1126 end.cenoff == ZIP64_MAGICVAL ||
1127 end.centot == ZIP64_MAGICCOUNT)
1128 {
1129 // need to find the zip64 end;
1130 try {
1131 byte[] loc64 = new byte[ZIP64_LOCHDR];
1132 if (readFullyAt(loc64, 0, loc64.length, end.endpos - ZIP64_LOCHDR)
1133 != loc64.length || GETSIG(loc64) != ZIP64_LOCSIG) {
1134 return end;
1135 }
1136 long end64pos = ZIP64_LOCOFF(loc64);
1137 byte[] end64buf = new byte[ZIP64_ENDHDR];
1138 if (readFullyAt(end64buf, 0, end64buf.length, end64pos)
1139 != end64buf.length || GETSIG(end64buf) != ZIP64_ENDSIG) {
1140 return end;
1141 }
1142 // end64 found, re-calcualte everything.
1143 end.cenlen = ZIP64_ENDSIZ(end64buf);
1144 end.cenoff = ZIP64_ENDOFF(end64buf);
1145 end.centot = (int)ZIP64_ENDTOT(end64buf); // assume total < 2g
1146 end.endpos = end64pos;
1147 } catch (IOException x) {} // no zip64 loc/end
1148 }
1149 return end;
1150 }
1151 }
1152 }
1153 zerror("zip END header not found");
1154 return null; //make compiler happy
1155 }
1156
1157 // Reads zip file central directory.
1158 private void initCEN(int knownTotal) throws IOException {
1159 if (knownTotal == -1) {
1160 End end = findEND();
1161 if (end.endpos == 0) {
1162 locpos = 0;
1163 total = 0;
1164 entries = new int[0];
1165 cen = null;
1166 return; // only END header present
1167 }
1168 if (end.cenlen > end.endpos)
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1105 // Let's do some extra verification, we don't care about the
1106 // performance in this situation.
1107 byte[] sbuf = new byte[4];
1108 long cenpos = end.endpos - end.cenlen;
1109 long locpos = cenpos - end.cenoff;
1110 if (cenpos < 0 ||
1111 locpos < 0 ||
1112 readFullyAt(sbuf, 0, sbuf.length, cenpos) != 4 ||
1113 GETSIG(sbuf) != CENSIG ||
1114 readFullyAt(sbuf, 0, sbuf.length, locpos) != 4 ||
1115 GETSIG(sbuf) != LOCSIG) {
1116 continue;
1117 }
1118 }
1119 if (comlen > 0) { // this zip file has comlen
1120 comment = new byte[comlen];
1121 if (readFullyAt(comment, 0, comlen, end.endpos + ENDHDR) != comlen) {
1122 zerror("zip comment read failed");
1123 }
1124 }
1125 // must check for a zip64 end record; it is always permitted to be present
1126 try {
1127 byte[] loc64 = new byte[ZIP64_LOCHDR];
1128 if (end.endpos < ZIP64_LOCHDR ||
1129 readFullyAt(loc64, 0, loc64.length, end.endpos - ZIP64_LOCHDR)
1130 != loc64.length || GETSIG(loc64) != ZIP64_LOCSIG) {
1131 return end;
1132 }
1133 long end64pos = ZIP64_LOCOFF(loc64);
1134 byte[] end64buf = new byte[ZIP64_ENDHDR];
1135 if (readFullyAt(end64buf, 0, end64buf.length, end64pos)
1136 != end64buf.length || GETSIG(end64buf) != ZIP64_ENDSIG) {
1137 return end;
1138 }
1139 // end64 candidate found,
1140 long cenlen64 = ZIP64_ENDSIZ(end64buf);
1141 long cenoff64 = ZIP64_ENDOFF(end64buf);
1142 long centot64 = ZIP64_ENDTOT(end64buf);
1143 // double-check
1144 if (cenlen64 != end.cenlen && end.cenlen != ZIP64_MAGICVAL ||
1145 cenoff64 != end.cenoff && end.cenoff != ZIP64_MAGICVAL ||
1146 centot64 != end.centot && end.centot != ZIP64_MAGICCOUNT) {
1147 return end;
1148 }
1149 // to use the end64 values
1150 end.cenlen = cenlen64;
1151 end.cenoff = cenoff64;
1152 end.centot = (int)centot64; // assume total < 2g
1153 end.endpos = end64pos;
1154 } catch (IOException x) {} // no zip64 loc/end
1155 return end;
1156 }
1157 }
1158 }
1159 zerror("zip END header not found");
1160 return null; //make compiler happy
1161 }
1162
1163 // Reads zip file central directory.
1164 private void initCEN(int knownTotal) throws IOException {
1165 if (knownTotal == -1) {
1166 End end = findEND();
1167 if (end.endpos == 0) {
1168 locpos = 0;
1169 total = 0;
1170 entries = new int[0];
1171 cen = null;
1172 return; // only END header present
1173 }
1174 if (end.cenlen > end.endpos)
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