khenaidoo | ac63710 | 2019-01-14 15:44:34 -0500 | [diff] [blame^] | 1 | package cbor |
| 2 | |
| 3 | import ( |
| 4 | "encoding/json" |
| 5 | "fmt" |
| 6 | "math" |
| 7 | "net" |
| 8 | ) |
| 9 | |
| 10 | // AppendNil inserts a 'Nil' object into the dst byte array. |
| 11 | func (Encoder) AppendNil(dst []byte) []byte { |
| 12 | return append(dst, byte(majorTypeSimpleAndFloat|additionalTypeNull)) |
| 13 | } |
| 14 | |
| 15 | // AppendBeginMarker inserts a map start into the dst byte array. |
| 16 | func (Encoder) AppendBeginMarker(dst []byte) []byte { |
| 17 | return append(dst, byte(majorTypeMap|additionalTypeInfiniteCount)) |
| 18 | } |
| 19 | |
| 20 | // AppendEndMarker inserts a map end into the dst byte array. |
| 21 | func (Encoder) AppendEndMarker(dst []byte) []byte { |
| 22 | return append(dst, byte(majorTypeSimpleAndFloat|additionalTypeBreak)) |
| 23 | } |
| 24 | |
| 25 | // AppendObjectData takes an object in form of a byte array and appends to dst. |
| 26 | func (Encoder) AppendObjectData(dst []byte, o []byte) []byte { |
| 27 | // BeginMarker is present in the dst, which |
| 28 | // should not be copied when appending to existing data. |
| 29 | return append(dst, o[1:]...) |
| 30 | } |
| 31 | |
| 32 | // AppendArrayStart adds markers to indicate the start of an array. |
| 33 | func (Encoder) AppendArrayStart(dst []byte) []byte { |
| 34 | return append(dst, byte(majorTypeArray|additionalTypeInfiniteCount)) |
| 35 | } |
| 36 | |
| 37 | // AppendArrayEnd adds markers to indicate the end of an array. |
| 38 | func (Encoder) AppendArrayEnd(dst []byte) []byte { |
| 39 | return append(dst, byte(majorTypeSimpleAndFloat|additionalTypeBreak)) |
| 40 | } |
| 41 | |
| 42 | // AppendArrayDelim adds markers to indicate end of a particular array element. |
| 43 | func (Encoder) AppendArrayDelim(dst []byte) []byte { |
| 44 | //No delimiters needed in cbor |
| 45 | return dst |
| 46 | } |
| 47 | |
| 48 | // AppendLineBreak is a noop that keep API compat with json encoder. |
| 49 | func (Encoder) AppendLineBreak(dst []byte) []byte { |
| 50 | // No line breaks needed in binary format. |
| 51 | return dst |
| 52 | } |
| 53 | |
| 54 | // AppendBool encodes and inserts a boolean value into the dst byte array. |
| 55 | func (Encoder) AppendBool(dst []byte, val bool) []byte { |
| 56 | b := additionalTypeBoolFalse |
| 57 | if val { |
| 58 | b = additionalTypeBoolTrue |
| 59 | } |
| 60 | return append(dst, byte(majorTypeSimpleAndFloat|b)) |
| 61 | } |
| 62 | |
| 63 | // AppendBools encodes and inserts an array of boolean values into the dst byte array. |
| 64 | func (e Encoder) AppendBools(dst []byte, vals []bool) []byte { |
| 65 | major := majorTypeArray |
| 66 | l := len(vals) |
| 67 | if l == 0 { |
| 68 | return e.AppendArrayEnd(e.AppendArrayStart(dst)) |
| 69 | } |
| 70 | if l <= additionalMax { |
| 71 | lb := byte(l) |
| 72 | dst = append(dst, byte(major|lb)) |
| 73 | } else { |
| 74 | dst = appendCborTypePrefix(dst, major, uint64(l)) |
| 75 | } |
| 76 | for _, v := range vals { |
| 77 | dst = e.AppendBool(dst, v) |
| 78 | } |
| 79 | return dst |
| 80 | } |
| 81 | |
| 82 | // AppendInt encodes and inserts an integer value into the dst byte array. |
| 83 | func (Encoder) AppendInt(dst []byte, val int) []byte { |
| 84 | major := majorTypeUnsignedInt |
| 85 | contentVal := val |
| 86 | if val < 0 { |
| 87 | major = majorTypeNegativeInt |
| 88 | contentVal = -val - 1 |
| 89 | } |
| 90 | if contentVal <= additionalMax { |
| 91 | lb := byte(contentVal) |
| 92 | dst = append(dst, byte(major|lb)) |
| 93 | } else { |
| 94 | dst = appendCborTypePrefix(dst, major, uint64(contentVal)) |
| 95 | } |
| 96 | return dst |
| 97 | } |
| 98 | |
| 99 | // AppendInts encodes and inserts an array of integer values into the dst byte array. |
| 100 | func (e Encoder) AppendInts(dst []byte, vals []int) []byte { |
| 101 | major := majorTypeArray |
| 102 | l := len(vals) |
| 103 | if l == 0 { |
| 104 | return e.AppendArrayEnd(e.AppendArrayStart(dst)) |
| 105 | } |
| 106 | if l <= additionalMax { |
| 107 | lb := byte(l) |
| 108 | dst = append(dst, byte(major|lb)) |
| 109 | } else { |
| 110 | dst = appendCborTypePrefix(dst, major, uint64(l)) |
| 111 | } |
| 112 | for _, v := range vals { |
| 113 | dst = e.AppendInt(dst, v) |
| 114 | } |
| 115 | return dst |
| 116 | } |
| 117 | |
| 118 | // AppendInt8 encodes and inserts an int8 value into the dst byte array. |
| 119 | func (e Encoder) AppendInt8(dst []byte, val int8) []byte { |
| 120 | return e.AppendInt(dst, int(val)) |
| 121 | } |
| 122 | |
| 123 | // AppendInts8 encodes and inserts an array of integer values into the dst byte array. |
| 124 | func (e Encoder) AppendInts8(dst []byte, vals []int8) []byte { |
| 125 | major := majorTypeArray |
| 126 | l := len(vals) |
| 127 | if l == 0 { |
| 128 | return e.AppendArrayEnd(e.AppendArrayStart(dst)) |
| 129 | } |
| 130 | if l <= additionalMax { |
| 131 | lb := byte(l) |
| 132 | dst = append(dst, byte(major|lb)) |
| 133 | } else { |
| 134 | dst = appendCborTypePrefix(dst, major, uint64(l)) |
| 135 | } |
| 136 | for _, v := range vals { |
| 137 | dst = e.AppendInt(dst, int(v)) |
| 138 | } |
| 139 | return dst |
| 140 | } |
| 141 | |
| 142 | // AppendInt16 encodes and inserts a int16 value into the dst byte array. |
| 143 | func (e Encoder) AppendInt16(dst []byte, val int16) []byte { |
| 144 | return e.AppendInt(dst, int(val)) |
| 145 | } |
| 146 | |
| 147 | // AppendInts16 encodes and inserts an array of int16 values into the dst byte array. |
| 148 | func (e Encoder) AppendInts16(dst []byte, vals []int16) []byte { |
| 149 | major := majorTypeArray |
| 150 | l := len(vals) |
| 151 | if l == 0 { |
| 152 | return e.AppendArrayEnd(e.AppendArrayStart(dst)) |
| 153 | } |
| 154 | if l <= additionalMax { |
| 155 | lb := byte(l) |
| 156 | dst = append(dst, byte(major|lb)) |
| 157 | } else { |
| 158 | dst = appendCborTypePrefix(dst, major, uint64(l)) |
| 159 | } |
| 160 | for _, v := range vals { |
| 161 | dst = e.AppendInt(dst, int(v)) |
| 162 | } |
| 163 | return dst |
| 164 | } |
| 165 | |
| 166 | // AppendInt32 encodes and inserts a int32 value into the dst byte array. |
| 167 | func (e Encoder) AppendInt32(dst []byte, val int32) []byte { |
| 168 | return e.AppendInt(dst, int(val)) |
| 169 | } |
| 170 | |
| 171 | // AppendInts32 encodes and inserts an array of int32 values into the dst byte array. |
| 172 | func (e Encoder) AppendInts32(dst []byte, vals []int32) []byte { |
| 173 | major := majorTypeArray |
| 174 | l := len(vals) |
| 175 | if l == 0 { |
| 176 | return e.AppendArrayEnd(e.AppendArrayStart(dst)) |
| 177 | } |
| 178 | if l <= additionalMax { |
| 179 | lb := byte(l) |
| 180 | dst = append(dst, byte(major|lb)) |
| 181 | } else { |
| 182 | dst = appendCborTypePrefix(dst, major, uint64(l)) |
| 183 | } |
| 184 | for _, v := range vals { |
| 185 | dst = e.AppendInt(dst, int(v)) |
| 186 | } |
| 187 | return dst |
| 188 | } |
| 189 | |
| 190 | // AppendInt64 encodes and inserts a int64 value into the dst byte array. |
| 191 | func (Encoder) AppendInt64(dst []byte, val int64) []byte { |
| 192 | major := majorTypeUnsignedInt |
| 193 | contentVal := val |
| 194 | if val < 0 { |
| 195 | major = majorTypeNegativeInt |
| 196 | contentVal = -val - 1 |
| 197 | } |
| 198 | if contentVal <= additionalMax { |
| 199 | lb := byte(contentVal) |
| 200 | dst = append(dst, byte(major|lb)) |
| 201 | } else { |
| 202 | dst = appendCborTypePrefix(dst, major, uint64(contentVal)) |
| 203 | } |
| 204 | return dst |
| 205 | } |
| 206 | |
| 207 | // AppendInts64 encodes and inserts an array of int64 values into the dst byte array. |
| 208 | func (e Encoder) AppendInts64(dst []byte, vals []int64) []byte { |
| 209 | major := majorTypeArray |
| 210 | l := len(vals) |
| 211 | if l == 0 { |
| 212 | return e.AppendArrayEnd(e.AppendArrayStart(dst)) |
| 213 | } |
| 214 | if l <= additionalMax { |
| 215 | lb := byte(l) |
| 216 | dst = append(dst, byte(major|lb)) |
| 217 | } else { |
| 218 | dst = appendCborTypePrefix(dst, major, uint64(l)) |
| 219 | } |
| 220 | for _, v := range vals { |
| 221 | dst = e.AppendInt64(dst, v) |
| 222 | } |
| 223 | return dst |
| 224 | } |
| 225 | |
| 226 | // AppendUint encodes and inserts an unsigned integer value into the dst byte array. |
| 227 | func (e Encoder) AppendUint(dst []byte, val uint) []byte { |
| 228 | return e.AppendInt64(dst, int64(val)) |
| 229 | } |
| 230 | |
| 231 | // AppendUints encodes and inserts an array of unsigned integer values into the dst byte array. |
| 232 | func (e Encoder) AppendUints(dst []byte, vals []uint) []byte { |
| 233 | major := majorTypeArray |
| 234 | l := len(vals) |
| 235 | if l == 0 { |
| 236 | return e.AppendArrayEnd(e.AppendArrayStart(dst)) |
| 237 | } |
| 238 | if l <= additionalMax { |
| 239 | lb := byte(l) |
| 240 | dst = append(dst, byte(major|lb)) |
| 241 | } else { |
| 242 | dst = appendCborTypePrefix(dst, major, uint64(l)) |
| 243 | } |
| 244 | for _, v := range vals { |
| 245 | dst = e.AppendUint(dst, v) |
| 246 | } |
| 247 | return dst |
| 248 | } |
| 249 | |
| 250 | // AppendUint8 encodes and inserts a unsigned int8 value into the dst byte array. |
| 251 | func (e Encoder) AppendUint8(dst []byte, val uint8) []byte { |
| 252 | return e.AppendUint(dst, uint(val)) |
| 253 | } |
| 254 | |
| 255 | // AppendUints8 encodes and inserts an array of uint8 values into the dst byte array. |
| 256 | func (e Encoder) AppendUints8(dst []byte, vals []uint8) []byte { |
| 257 | major := majorTypeArray |
| 258 | l := len(vals) |
| 259 | if l == 0 { |
| 260 | return e.AppendArrayEnd(e.AppendArrayStart(dst)) |
| 261 | } |
| 262 | if l <= additionalMax { |
| 263 | lb := byte(l) |
| 264 | dst = append(dst, byte(major|lb)) |
| 265 | } else { |
| 266 | dst = appendCborTypePrefix(dst, major, uint64(l)) |
| 267 | } |
| 268 | for _, v := range vals { |
| 269 | dst = e.AppendUint8(dst, v) |
| 270 | } |
| 271 | return dst |
| 272 | } |
| 273 | |
| 274 | // AppendUint16 encodes and inserts a uint16 value into the dst byte array. |
| 275 | func (e Encoder) AppendUint16(dst []byte, val uint16) []byte { |
| 276 | return e.AppendUint(dst, uint(val)) |
| 277 | } |
| 278 | |
| 279 | // AppendUints16 encodes and inserts an array of uint16 values into the dst byte array. |
| 280 | func (e Encoder) AppendUints16(dst []byte, vals []uint16) []byte { |
| 281 | major := majorTypeArray |
| 282 | l := len(vals) |
| 283 | if l == 0 { |
| 284 | return e.AppendArrayEnd(e.AppendArrayStart(dst)) |
| 285 | } |
| 286 | if l <= additionalMax { |
| 287 | lb := byte(l) |
| 288 | dst = append(dst, byte(major|lb)) |
| 289 | } else { |
| 290 | dst = appendCborTypePrefix(dst, major, uint64(l)) |
| 291 | } |
| 292 | for _, v := range vals { |
| 293 | dst = e.AppendUint16(dst, v) |
| 294 | } |
| 295 | return dst |
| 296 | } |
| 297 | |
| 298 | // AppendUint32 encodes and inserts a uint32 value into the dst byte array. |
| 299 | func (e Encoder) AppendUint32(dst []byte, val uint32) []byte { |
| 300 | return e.AppendUint(dst, uint(val)) |
| 301 | } |
| 302 | |
| 303 | // AppendUints32 encodes and inserts an array of uint32 values into the dst byte array. |
| 304 | func (e Encoder) AppendUints32(dst []byte, vals []uint32) []byte { |
| 305 | major := majorTypeArray |
| 306 | l := len(vals) |
| 307 | if l == 0 { |
| 308 | return e.AppendArrayEnd(e.AppendArrayStart(dst)) |
| 309 | } |
| 310 | if l <= additionalMax { |
| 311 | lb := byte(l) |
| 312 | dst = append(dst, byte(major|lb)) |
| 313 | } else { |
| 314 | dst = appendCborTypePrefix(dst, major, uint64(l)) |
| 315 | } |
| 316 | for _, v := range vals { |
| 317 | dst = e.AppendUint32(dst, v) |
| 318 | } |
| 319 | return dst |
| 320 | } |
| 321 | |
| 322 | // AppendUint64 encodes and inserts a uint64 value into the dst byte array. |
| 323 | func (Encoder) AppendUint64(dst []byte, val uint64) []byte { |
| 324 | major := majorTypeUnsignedInt |
| 325 | contentVal := val |
| 326 | if contentVal <= additionalMax { |
| 327 | lb := byte(contentVal) |
| 328 | dst = append(dst, byte(major|lb)) |
| 329 | } else { |
| 330 | dst = appendCborTypePrefix(dst, major, uint64(contentVal)) |
| 331 | } |
| 332 | return dst |
| 333 | } |
| 334 | |
| 335 | // AppendUints64 encodes and inserts an array of uint64 values into the dst byte array. |
| 336 | func (e Encoder) AppendUints64(dst []byte, vals []uint64) []byte { |
| 337 | major := majorTypeArray |
| 338 | l := len(vals) |
| 339 | if l == 0 { |
| 340 | return e.AppendArrayEnd(e.AppendArrayStart(dst)) |
| 341 | } |
| 342 | if l <= additionalMax { |
| 343 | lb := byte(l) |
| 344 | dst = append(dst, byte(major|lb)) |
| 345 | } else { |
| 346 | dst = appendCborTypePrefix(dst, major, uint64(l)) |
| 347 | } |
| 348 | for _, v := range vals { |
| 349 | dst = e.AppendUint64(dst, v) |
| 350 | } |
| 351 | return dst |
| 352 | } |
| 353 | |
| 354 | // AppendFloat32 encodes and inserts a single precision float value into the dst byte array. |
| 355 | func (Encoder) AppendFloat32(dst []byte, val float32) []byte { |
| 356 | switch { |
| 357 | case math.IsNaN(float64(val)): |
| 358 | return append(dst, "\xfa\x7f\xc0\x00\x00"...) |
| 359 | case math.IsInf(float64(val), 1): |
| 360 | return append(dst, "\xfa\x7f\x80\x00\x00"...) |
| 361 | case math.IsInf(float64(val), -1): |
| 362 | return append(dst, "\xfa\xff\x80\x00\x00"...) |
| 363 | } |
| 364 | major := majorTypeSimpleAndFloat |
| 365 | subType := additionalTypeFloat32 |
| 366 | n := math.Float32bits(val) |
| 367 | var buf [4]byte |
| 368 | for i := uint(0); i < 4; i++ { |
| 369 | buf[i] = byte(n >> ((3 - i) * 8)) |
| 370 | } |
| 371 | return append(append(dst, byte(major|subType)), buf[0], buf[1], buf[2], buf[3]) |
| 372 | } |
| 373 | |
| 374 | // AppendFloats32 encodes and inserts an array of single precision float value into the dst byte array. |
| 375 | func (e Encoder) AppendFloats32(dst []byte, vals []float32) []byte { |
| 376 | major := majorTypeArray |
| 377 | l := len(vals) |
| 378 | if l == 0 { |
| 379 | return e.AppendArrayEnd(e.AppendArrayStart(dst)) |
| 380 | } |
| 381 | if l <= additionalMax { |
| 382 | lb := byte(l) |
| 383 | dst = append(dst, byte(major|lb)) |
| 384 | } else { |
| 385 | dst = appendCborTypePrefix(dst, major, uint64(l)) |
| 386 | } |
| 387 | for _, v := range vals { |
| 388 | dst = e.AppendFloat32(dst, v) |
| 389 | } |
| 390 | return dst |
| 391 | } |
| 392 | |
| 393 | // AppendFloat64 encodes and inserts a double precision float value into the dst byte array. |
| 394 | func (Encoder) AppendFloat64(dst []byte, val float64) []byte { |
| 395 | switch { |
| 396 | case math.IsNaN(val): |
| 397 | return append(dst, "\xfb\x7f\xf8\x00\x00\x00\x00\x00\x00"...) |
| 398 | case math.IsInf(val, 1): |
| 399 | return append(dst, "\xfb\x7f\xf0\x00\x00\x00\x00\x00\x00"...) |
| 400 | case math.IsInf(val, -1): |
| 401 | return append(dst, "\xfb\xff\xf0\x00\x00\x00\x00\x00\x00"...) |
| 402 | } |
| 403 | major := majorTypeSimpleAndFloat |
| 404 | subType := additionalTypeFloat64 |
| 405 | n := math.Float64bits(val) |
| 406 | dst = append(dst, byte(major|subType)) |
| 407 | for i := uint(1); i <= 8; i++ { |
| 408 | b := byte(n >> ((8 - i) * 8)) |
| 409 | dst = append(dst, b) |
| 410 | } |
| 411 | return dst |
| 412 | } |
| 413 | |
| 414 | // AppendFloats64 encodes and inserts an array of double precision float values into the dst byte array. |
| 415 | func (e Encoder) AppendFloats64(dst []byte, vals []float64) []byte { |
| 416 | major := majorTypeArray |
| 417 | l := len(vals) |
| 418 | if l == 0 { |
| 419 | return e.AppendArrayEnd(e.AppendArrayStart(dst)) |
| 420 | } |
| 421 | if l <= additionalMax { |
| 422 | lb := byte(l) |
| 423 | dst = append(dst, byte(major|lb)) |
| 424 | } else { |
| 425 | dst = appendCborTypePrefix(dst, major, uint64(l)) |
| 426 | } |
| 427 | for _, v := range vals { |
| 428 | dst = e.AppendFloat64(dst, v) |
| 429 | } |
| 430 | return dst |
| 431 | } |
| 432 | |
| 433 | // AppendInterface takes an arbitrary object and converts it to JSON and embeds it dst. |
| 434 | func (e Encoder) AppendInterface(dst []byte, i interface{}) []byte { |
| 435 | marshaled, err := json.Marshal(i) |
| 436 | if err != nil { |
| 437 | return e.AppendString(dst, fmt.Sprintf("marshaling error: %v", err)) |
| 438 | } |
| 439 | return AppendEmbeddedJSON(dst, marshaled) |
| 440 | } |
| 441 | |
| 442 | // AppendIPAddr encodes and inserts an IP Address (IPv4 or IPv6). |
| 443 | func (e Encoder) AppendIPAddr(dst []byte, ip net.IP) []byte { |
| 444 | dst = append(dst, byte(majorTypeTags|additionalTypeIntUint16)) |
| 445 | dst = append(dst, byte(additionalTypeTagNetworkAddr>>8)) |
| 446 | dst = append(dst, byte(additionalTypeTagNetworkAddr&0xff)) |
| 447 | return e.AppendBytes(dst, ip) |
| 448 | } |
| 449 | |
| 450 | // AppendIPPrefix encodes and inserts an IP Address Prefix (Address + Mask Length). |
| 451 | func (e Encoder) AppendIPPrefix(dst []byte, pfx net.IPNet) []byte { |
| 452 | dst = append(dst, byte(majorTypeTags|additionalTypeIntUint16)) |
| 453 | dst = append(dst, byte(additionalTypeTagNetworkPrefix>>8)) |
| 454 | dst = append(dst, byte(additionalTypeTagNetworkPrefix&0xff)) |
| 455 | |
| 456 | // Prefix is a tuple (aka MAP of 1 pair of elements) - |
| 457 | // first element is prefix, second is mask length. |
| 458 | dst = append(dst, byte(majorTypeMap|0x1)) |
| 459 | dst = e.AppendBytes(dst, pfx.IP) |
| 460 | maskLen, _ := pfx.Mask.Size() |
| 461 | return e.AppendUint8(dst, uint8(maskLen)) |
| 462 | } |
| 463 | |
| 464 | // AppendMACAddr encodes and inserts an Hardware (MAC) address. |
| 465 | func (e Encoder) AppendMACAddr(dst []byte, ha net.HardwareAddr) []byte { |
| 466 | dst = append(dst, byte(majorTypeTags|additionalTypeIntUint16)) |
| 467 | dst = append(dst, byte(additionalTypeTagNetworkAddr>>8)) |
| 468 | dst = append(dst, byte(additionalTypeTagNetworkAddr&0xff)) |
| 469 | return e.AppendBytes(dst, ha) |
| 470 | } |
| 471 | |
| 472 | // AppendHex adds a TAG and inserts a hex bytes as a string. |
| 473 | func (e Encoder) AppendHex(dst []byte, val []byte) []byte { |
| 474 | dst = append(dst, byte(majorTypeTags|additionalTypeIntUint16)) |
| 475 | dst = append(dst, byte(additionalTypeTagHexString>>8)) |
| 476 | dst = append(dst, byte(additionalTypeTagHexString&0xff)) |
| 477 | return e.AppendBytes(dst, val) |
| 478 | } |