| 1100 | } |
| 1101 | |
| 1102 | bool isEpsType(BasicIo& iIo, bool advance) { |
| 1103 | // read as many bytes as needed for the longest (DOS) EPS signature |
| 1104 | size_t bufSize = dosEpsSignature.size(); |
| 1105 | for (auto&& i : epsFirstLine) { |
| 1106 | if (bufSize < i.size()) { |
| 1107 | bufSize = i.size(); |
| 1108 | } |
| 1109 | } |
| 1110 | const size_t restore = iIo.tell(); // save |
| 1111 | DataBuf buf = iIo.read(bufSize); |
| 1112 | if (iIo.error() || buf.size() != bufSize) { |
| 1113 | iIo.seek(restore, BasicIo::beg); |
| 1114 | return false; |
| 1115 | } |
| 1116 | // check for all possible (DOS) EPS signatures |
| 1117 | bool matched = (buf.cmpBytes(0, dosEpsSignature.data(), dosEpsSignature.size()) == 0); |
| 1118 | if (!matched) { |
| 1119 | for (auto&& eps : epsFirstLine) { |
| 1120 | if (buf.cmpBytes(0, eps.data(), eps.size()) == 0) { |
| 1121 | matched = true; |
| 1122 | break; |
| 1123 | } |
| 1124 | } |
| 1125 | } |
| 1126 | // seek back if possible and requested |
| 1127 | if (!advance || !matched) { |
| 1128 | iIo.seek(restore, BasicIo::beg); |
| 1129 | } |
| 1130 | return matched; |
| 1131 | } |
| 1132 | |
| 1133 | } // namespace Exiv2 |