1 | // Copyright (c) 2013 by István Váradi
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2 |
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3 | // This file is part of libxplcommon, a common utility library for
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4 | // development related to X-Plane
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5 |
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6 | // Redistribution and use in source and binary forms, with or without
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7 | // modification, are permitted provided that the following conditions are met:
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8 |
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9 | // 1. Redistributions of source code must retain the above copyright notice, this
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10 | // list of conditions and the following disclaimer.
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11 | // 2. Redistributions in binary form must reproduce the above copyright notice,
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12 | // this list of conditions and the following disclaimer in the documentation
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13 | // and/or other materials provided with the distribution.
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14 |
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15 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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16 | // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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17 | // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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18 | // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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19 | // ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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20 | // (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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21 | // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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22 | // ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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23 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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24 | // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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25 |
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26 | // The views and conclusions contained in the software and documentation are those
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27 | // of the authors and should not be interpreted as representing official policies,
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28 | // either expressed or implied, of the FreeBSD Project.
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29 |
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30 | //------------------------------------------------------------------------------
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31 |
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32 | #include "DataStream.h"
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33 |
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34 | //------------------------------------------------------------------------------
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35 |
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36 | using xplcommon::DataStream;
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37 |
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38 | using std::string;
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39 | using std::min;
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40 |
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41 | //------------------------------------------------------------------------------
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42 |
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43 | size_t DataStream::readLength()
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44 | {
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45 | size_t length = 0;
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46 |
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47 | uint8_t d = 0;
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48 | do {
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49 | d = readU8();
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50 | length <<= 7;
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51 | length |= d&0x7f;
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52 | } while( (d&0x80)==0x80 );
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53 |
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54 | return length;
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55 | }
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56 |
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57 | //------------------------------------------------------------------------------
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58 |
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59 | string DataStream::readString()
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60 | {
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61 | size_t length = readLength();
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62 | if (!*this) return "";
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63 |
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64 | char* buffer = new char[length];
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65 | if (read(buffer, length)) {
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66 | string str(buffer, length);
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67 | delete buffer;
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68 | return str;
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69 | } else {
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70 | delete buffer;
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71 | return "";
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72 | }
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73 | }
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74 |
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75 | //------------------------------------------------------------------------------
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76 |
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77 | size_t DataStream::readString(char* dest, size_t capacity)
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78 | {
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79 | size_t length = readLength();
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80 | size_t destLength = 0;
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81 | if (*this && length>0) {
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82 | size_t destLength = min(length, capacity - 1);
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83 | if (read(dest, destLength)) {
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84 | if (destLength<length) {
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85 | if (!skip(length - destLength)) {
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86 | length = destLength = 0;
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87 | }
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88 | }
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89 | } else {
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90 | length = destLength = 0;
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91 | }
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92 | } else {
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93 | length = 0;
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94 | }
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95 |
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96 | dest[destLength] = '\0';
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97 |
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98 | return length;
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99 | }
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100 |
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101 | //------------------------------------------------------------------------------
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102 |
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103 | bool DataStream::writeLength(size_t length)
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104 | {
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105 | do {
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106 | uint8_t x = length&0x7f;
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107 | length >>= 7;
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108 | if (length>0) x |= 0x80;
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109 | if (!writeU8(x)) return false;
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110 | } while(length>0);
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111 | return true;
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112 | }
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113 |
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114 | //------------------------------------------------------------------------------
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115 |
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116 | // Local Variables:
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117 | // mode: C++
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118 | // c-basic-offset: 4
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119 | // indent-tabs-mode: nil
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120 | // End:
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