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package decode |
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2
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3
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import ( |
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4
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"fmt" |
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5
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"io" |
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6
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7
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"github.com/et-nik/binngo/binn" |
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8
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"github.com/et-nik/binngo/encode" |
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9
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) |
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10
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11
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func readValue(btype binn.Type, reader io.Reader) ([]byte, error) { |
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12
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1 |
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tp := btype &^ binn.StorageTypeMask |
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13
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14
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1 |
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var readingSize int |
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15
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1 |
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var containerSize int |
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16
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17
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1 |
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var bytes []byte |
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18
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19
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1 |
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switch tp { |
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20
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case binn.StorageNoBytes: |
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1 |
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readingSize = 0 |
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22
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case binn.StorageByte: |
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23
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1 |
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readingSize = 1 |
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24
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case binn.StorageWord: |
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25
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1 |
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readingSize = 2 |
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26
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case binn.StorageDWord: |
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27
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1 |
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readingSize = 4 |
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28
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case binn.StorageQWord: |
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29
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1 |
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readingSize = 8 |
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30
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case binn.StorageString: |
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31
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1 |
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dataSize, _, err := readSize(reader) |
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32
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1 |
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if err != nil { |
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33
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return nil, fmt.Errorf("failed to read string storage size: %w", err) |
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} |
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35
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1 |
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readingSize = dataSize + 1 // data size and null terminator |
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36
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case binn.StorageBlob: |
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37
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1 |
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dataSize, _, err := readSize(reader) |
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1 |
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if err != nil { |
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39
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return nil, fmt.Errorf("failed to read string storage size: %w", err) |
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40
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} |
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41
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1 |
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readingSize = dataSize |
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42
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case binn.StorageContainer: |
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43
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1 |
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s, l, err := readSize(reader) |
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1 |
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if err != nil { |
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45
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return nil, fmt.Errorf("failed to read storage size: %w", err) |
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46
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} |
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47
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48
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1 |
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containerSize = s |
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49
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50
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1 |
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bytes = append(bytes, encode.Int(s)...) |
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51
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52
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1 |
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readingSize = containerSize - 1 - int(l) // minus container type byte and size byte |
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53
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default: |
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54
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return nil, ErrUnknownType |
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55
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} |
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56
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57
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1 |
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if readingSize == 0 { |
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58
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1 |
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return []byte{byte(btype)}, nil |
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59
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} |
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60
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61
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1 |
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b := make([]byte, readingSize) |
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63
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1 |
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_, err := reader.Read(b) |
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64
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1 |
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bytes = append(bytes, b...) |
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66
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1 |
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if err != nil { |
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return nil, fmt.Errorf("failed to read storage: %w", err) |
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68
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} |
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69
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70
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1 |
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return bytes, nil |
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71
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} |
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73
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func isStorageContainer(btype binn.Type) bool { |
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74
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1 |
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return (btype &^ binn.StorageTypeMask) == binn.StorageContainer |
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75
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} |
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76
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1 |
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77
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1 |
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func readType(reader io.Reader) (binn.Type, readLen, error) { |
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78
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1 |
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var bt = make([]byte, 1) |
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79
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80
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_, err := reader.Read(bt) |
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81
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1 |
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if err != nil { |
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82
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return binn.Null, 0, ErrFailedToReadType |
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83
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} |
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84
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85
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1 |
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return Type(bt), 1, nil |
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86
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1 |
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} |
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87
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1 |
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88
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func readSize(reader io.Reader) (int, readLen, error) { |
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89
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var bsz = make([]byte, 1) |
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90
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_, err := reader.Read(bsz) |
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91
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1 |
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if err != nil { |
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92
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return 0, 0, ErrFailedToReadSize |
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93
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1 |
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} |
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94
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95
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1 |
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read := 1 |
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96
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97
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sz := int(Uint8(bsz)) |
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98
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99
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if sz > maxOneByteSize { |
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100
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var bszOtherBytes = make([]byte, 3) |
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101
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_, err := reader.Read(bszOtherBytes) |
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102
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if err != nil { |
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103
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return 0, 0, fmt.Errorf("failed to read long size: %w", err) |
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104
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} |
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105
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read += 3 |
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106
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sz ^= 0x80000000 |
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107
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108
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sz = int(Uint32([]byte{ |
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109
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byte(sz), |
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110
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bszOtherBytes[0], |
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111
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bszOtherBytes[1], |
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112
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1 |
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bszOtherBytes[2], |
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113
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})) |
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114
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} |
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115
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116
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return sz, readLen(read), nil |
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117
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} |
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118
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et-nik /
binngo
