|
| 1 | +package state |
| 2 | + |
| 3 | +import ( |
| 4 | + "bytes" |
| 5 | + "encoding" |
| 6 | + "encoding/binary" |
| 7 | + "errors" |
| 8 | + "io" |
| 9 | + "strconv" |
| 10 | + |
| 11 | + "github.com/applejag/epic-wizard-firefly-gladiators/pkg/util" |
| 12 | +) |
| 13 | + |
| 14 | +type FieldError struct { |
| 15 | + Field string |
| 16 | + Err error |
| 17 | +} |
| 18 | + |
| 19 | +func (err FieldError) Error() string { |
| 20 | + return err.Field + ": " + err.Err.Error() |
| 21 | +} |
| 22 | + |
| 23 | +func (err FieldError) Unwrap() error { |
| 24 | + return err.Err |
| 25 | +} |
| 26 | + |
| 27 | +type IndexedFieldError struct { |
| 28 | + Field string |
| 29 | + Index int |
| 30 | + Err error |
| 31 | +} |
| 32 | + |
| 33 | +func (err IndexedFieldError) Error() string { |
| 34 | + return err.Field + "[" + strconv.Itoa(err.Index) + "]: " + err.Err.Error() |
| 35 | +} |
| 36 | + |
| 37 | +func (err IndexedFieldError) Unwrap() error { |
| 38 | + return err.Err |
| 39 | +} |
| 40 | + |
| 41 | +// Arbitrary number, mostly for future-proofing |
| 42 | +const FileMarker byte = 0x37 |
| 43 | + |
| 44 | +type FieldState byte |
| 45 | + |
| 46 | +const ( |
| 47 | + FieldStateUnknown FieldState = 0 |
| 48 | + FieldStateFireflies FieldState = 1 |
| 49 | + FieldStateBattlesWonTotal FieldState = 2 |
| 50 | + FieldStateBattlesPlayedTotal FieldState = 3 |
| 51 | + FieldStateMoney FieldState = 4 |
| 52 | +) |
| 53 | + |
| 54 | +var ( |
| 55 | + _ encoding.BinaryAppender = &GameState{} |
| 56 | + _ encoding.BinaryUnmarshaler = &GameState{} |
| 57 | +) |
| 58 | + |
| 59 | +// UnmarshalBinary implements [encoding.BinaryUnmarshaler]. |
| 60 | +func (g *GameState) UnmarshalBinary(data []byte) error { |
| 61 | + buf := bytes.NewBuffer(data) |
| 62 | + |
| 63 | + if marker, err := buf.ReadByte(); err != nil || marker != FileMarker { |
| 64 | + return errors.New("invalid save file marker") |
| 65 | + } |
| 66 | + |
| 67 | + for { |
| 68 | + next, err := buf.ReadByte() |
| 69 | + if err != nil { |
| 70 | + if err == io.EOF { |
| 71 | + return nil |
| 72 | + } |
| 73 | + return err |
| 74 | + } |
| 75 | + |
| 76 | + switch FieldState(next) { |
| 77 | + case FieldStateBattlesPlayedTotal: |
| 78 | + val, err := binary.ReadUvarint(buf) |
| 79 | + if err != nil { |
| 80 | + return FieldError{Field: "GameState.BattlesPlayedTotal", Err: err} |
| 81 | + } |
| 82 | + g.BattlesPlayedTotal = int(val) |
| 83 | + case FieldStateBattlesWonTotal: |
| 84 | + val, err := binary.ReadUvarint(buf) |
| 85 | + if err != nil { |
| 86 | + return FieldError{Field: "GameState.BattlesWonTotal", Err: err} |
| 87 | + } |
| 88 | + g.BattlesWonTotal = int(val) |
| 89 | + case FieldStateMoney: |
| 90 | + val, err := binary.ReadUvarint(buf) |
| 91 | + if err != nil { |
| 92 | + return FieldError{Field: "GameState.Money", Err: err} |
| 93 | + } |
| 94 | + g.Money = int(val) |
| 95 | + case FieldStateFireflies: |
| 96 | + val, err := binary.ReadUvarint(buf) |
| 97 | + if err != nil { |
| 98 | + return FieldError{Field: "GameState.Fireflies.len", Err: err} |
| 99 | + } |
| 100 | + if val > 99 { |
| 101 | + return FieldError{Field: "GameState.Fireflies.len", Err: errors.New("too many fireflies")} |
| 102 | + } |
| 103 | + g.Fireflies = make([]Firefly, val) |
| 104 | + for i := range int(val) { |
| 105 | + if err := g.Fireflies[i].UnmarshalBinaryBuf(buf); err != nil { |
| 106 | + return IndexedFieldError{Field: "GameState.Fireflies", Index: i, Err: err} |
| 107 | + } |
| 108 | + } |
| 109 | + default: |
| 110 | + return errors.New("unexpected game state field") |
| 111 | + } |
| 112 | + } |
| 113 | +} |
| 114 | + |
| 115 | +// AppendBinary implements [encoding.BinaryAppender]. |
| 116 | +func (g *GameState) AppendBinary(b []byte) ([]byte, error) { |
| 117 | + b = append(b, FileMarker) |
| 118 | + |
| 119 | + b = append(b, byte(FieldStateFireflies)) |
| 120 | + b = binary.AppendUvarint(b, uint64(len(g.Fireflies))) |
| 121 | + for i := range g.Fireflies { |
| 122 | + var err error |
| 123 | + b, err = g.Fireflies[i].AppendBinary(b) |
| 124 | + if err != nil { |
| 125 | + return b, IndexedFieldError{Field: "GameState.Fireflies", Index: i, Err: err} |
| 126 | + } |
| 127 | + } |
| 128 | + |
| 129 | + b = append(b, byte(FieldStateBattlesWonTotal)) |
| 130 | + b = binary.AppendUvarint(b, uint64(g.BattlesWonTotal)) |
| 131 | + b = append(b, byte(FieldStateBattlesPlayedTotal)) |
| 132 | + b = binary.AppendUvarint(b, uint64(g.BattlesPlayedTotal)) |
| 133 | + b = append(b, byte(FieldStateMoney)) |
| 134 | + b = binary.AppendUvarint(b, uint64(g.Money)) |
| 135 | + |
| 136 | + return b, nil |
| 137 | +} |
| 138 | + |
| 139 | +type FieldFirefly byte |
| 140 | + |
| 141 | +const ( |
| 142 | + FieldFireflyEOF FieldFirefly = 0 |
| 143 | + FieldFireflyID FieldFirefly = 1 |
| 144 | + FieldFireflyName FieldFirefly = 2 |
| 145 | + FieldFireflySpeed FieldFirefly = 3 |
| 146 | + FieldFireflyNimbleness FieldFirefly = 4 |
| 147 | + FieldFireflyBattlesPlayed FieldFirefly = 5 |
| 148 | + FieldFireflyBattlesWon FieldFirefly = 6 |
| 149 | + FieldFireflyHat FieldFirefly = 7 |
| 150 | +) |
| 151 | + |
| 152 | +func (f *Firefly) UnmarshalBinaryBuf(buf *bytes.Buffer) error { |
| 153 | + for { |
| 154 | + next, err := buf.ReadByte() |
| 155 | + if err != nil { |
| 156 | + if err == io.EOF { |
| 157 | + return nil |
| 158 | + } |
| 159 | + return err |
| 160 | + } |
| 161 | + |
| 162 | + switch FieldFirefly(next) { |
| 163 | + case FieldFireflyID: |
| 164 | + val, err := binary.ReadUvarint(buf) |
| 165 | + if err != nil { |
| 166 | + return FieldError{Field: "Firefly.ID", Err: err} |
| 167 | + } |
| 168 | + f.ID = int(val) |
| 169 | + case FieldFireflyName: |
| 170 | + val, err := binary.ReadUvarint(buf) |
| 171 | + if err != nil { |
| 172 | + return FieldError{Field: "Firefly.Name", Err: err} |
| 173 | + } |
| 174 | + f.Name = util.Name(val) |
| 175 | + case FieldFireflySpeed: |
| 176 | + val, err := binary.ReadUvarint(buf) |
| 177 | + if err != nil { |
| 178 | + return FieldError{Field: "Firefly.Speed", Err: err} |
| 179 | + } |
| 180 | + f.Speed = int(val) |
| 181 | + case FieldFireflyNimbleness: |
| 182 | + val, err := binary.ReadUvarint(buf) |
| 183 | + if err != nil { |
| 184 | + return FieldError{Field: "Firefly.Nimbleness", Err: err} |
| 185 | + } |
| 186 | + f.Nimbleness = int(val) |
| 187 | + case FieldFireflyBattlesPlayed: |
| 188 | + val, err := binary.ReadUvarint(buf) |
| 189 | + if err != nil { |
| 190 | + return FieldError{Field: "Firefly.BattlesPlayed", Err: err} |
| 191 | + } |
| 192 | + f.BattlesPlayed = int(val) |
| 193 | + case FieldFireflyBattlesWon: |
| 194 | + val, err := binary.ReadUvarint(buf) |
| 195 | + if err != nil { |
| 196 | + return FieldError{Field: "Firefly.BattlesWon", Err: err} |
| 197 | + } |
| 198 | + f.BattlesWon = int(val) |
| 199 | + case FieldFireflyHat: |
| 200 | + val, err := binary.ReadUvarint(buf) |
| 201 | + if err != nil { |
| 202 | + return FieldError{Field: "Firefly.Hat", Err: err} |
| 203 | + } |
| 204 | + f.Hat = int(val) |
| 205 | + case FieldFireflyEOF: |
| 206 | + return nil |
| 207 | + default: |
| 208 | + return errors.New("unexpected firefly field") |
| 209 | + } |
| 210 | + } |
| 211 | +} |
| 212 | + |
| 213 | +// AppendBinary implements [encoding.BinaryAppender]. |
| 214 | +func (f *Firefly) AppendBinary(b []byte) ([]byte, error) { |
| 215 | + b = append(b, byte(FieldFireflyID)) |
| 216 | + b = binary.AppendUvarint(b, uint64(f.ID)) |
| 217 | + b = append(b, byte(FieldFireflyName)) |
| 218 | + b = binary.AppendUvarint(b, uint64(f.Name)) |
| 219 | + b = append(b, byte(FieldFireflySpeed)) |
| 220 | + b = binary.AppendUvarint(b, uint64(f.Speed)) |
| 221 | + b = append(b, byte(FieldFireflyNimbleness)) |
| 222 | + b = binary.AppendUvarint(b, uint64(f.Nimbleness)) |
| 223 | + b = append(b, byte(FieldFireflyBattlesPlayed)) |
| 224 | + b = binary.AppendUvarint(b, uint64(f.BattlesPlayed)) |
| 225 | + b = append(b, byte(FieldFireflyBattlesWon)) |
| 226 | + b = binary.AppendUvarint(b, uint64(f.BattlesWon)) |
| 227 | + b = append(b, byte(FieldFireflyHat)) |
| 228 | + b = binary.AppendUvarint(b, uint64(f.Hat)) |
| 229 | + |
| 230 | + return append(b, byte(FieldFireflyEOF)), nil |
| 231 | +} |
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