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1 /** |
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2 * Relational pipes |
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3 * Copyright © 2021 František Kučera (Frantovo.cz, GlobalCode.info) |
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4 * |
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5 * This program is free software: you can redistribute it and/or modify |
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6 * it under the terms of the GNU General Public License as published by |
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7 * the Free Software Foundation, version 3 of the License. |
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8 * |
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9 * This program is distributed in the hope that it will be useful, |
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10 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 * GNU General Public License for more details. |
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13 * |
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14 * You should have received a copy of the GNU General Public License |
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15 * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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16 */ |
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17 |
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18 #include "AbstractParser.h" |
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19 #include "TransactionalBuffer.h" |
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20 |
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21 namespace relpipe { |
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22 namespace in { |
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23 namespace asn1 { |
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24 namespace lib { |
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25 |
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26 class AbstractParserImpl { |
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27 private: |
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28 friend AbstractParser; |
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29 AbstractParser* interface; |
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30 TransactionalBuffer buffer; |
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31 public: |
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32 |
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33 AbstractParserImpl(AbstractParser* interface) : interface(interface) { |
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34 } |
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35 |
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36 virtual ~AbstractParserImpl() { |
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37 } |
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38 }; |
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39 |
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40 AbstractParser::AbstractParser() { |
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41 implementation = new AbstractParserImpl(this); |
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42 } |
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43 |
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44 AbstractParser::~AbstractParser() { |
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45 delete implementation; |
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46 } |
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47 |
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48 void AbstractParser::write(const uint8_t* buffer, const size_t length) { |
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49 try { |
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50 // TODO: do not write to the buffer, just append in read()/peek() and write just the part that was not read during this cycle |
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51 implementation->buffer.write(buffer, length); |
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52 |
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53 // TODO: call an overridable method to get preferred minimum block size and run cycle only if we have enough data or EOF |
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54 // and/or remember the length of last failed (rollbacked) read() call |
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55 update(); |
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56 commit(); |
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57 } catch (const TransactionalBuffer::ReadBufferUnderflowException& e) { |
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58 rollback(); |
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59 } catch (const AbstractParser::ExplicitRollbackException& e) { |
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60 rollback(); |
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61 } |
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62 } |
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63 |
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64 void AbstractParser::close() { |
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65 // TODO: check remaining data + call update() or just let parsers override this method? |
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66 } |
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67 |
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68 void AbstractParser::rollback() { |
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69 // TODO: notify rollback listeners? (they can monitor the performance / frequency of rollbacks) |
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70 implementation->buffer.rollbackRead(); |
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71 } |
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72 |
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73 void AbstractParser::commit() { |
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74 implementation->buffer.commitRead(); |
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75 } |
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76 |
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77 void AbstractParser::read(uint8_t* buffer, const size_t length) { |
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78 implementation->buffer.read(buffer, length); |
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79 } |
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80 |
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81 void AbstractParser::peek(uint8_t* buffer, const size_t length) { |
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82 implementation->buffer.peek(buffer, length); |
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83 } |
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84 |
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85 size_t AbstractParser::getBytesRead() { |
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86 return implementation->buffer.getBytesRead(); |
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87 } |
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88 |
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89 } |
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90 } |
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91 } |
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92 } |