| OLD | NEW |
|---|
| (Empty) |
| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 define("mojo/public/js/validator", [ | |
| 6 "mojo/public/js/codec", | |
| 7 ], function(codec) { | |
| 8 | |
| 9 var validationError = { | |
| 10 NONE: 'VALIDATION_ERROR_NONE', | |
| 11 MISALIGNED_OBJECT: 'VALIDATION_ERROR_MISALIGNED_OBJECT', | |
| 12 ILLEGAL_MEMORY_RANGE: 'VALIDATION_ERROR_ILLEGAL_MEMORY_RANGE', | |
| 13 UNEXPECTED_STRUCT_HEADER: 'VALIDATION_ERROR_UNEXPECTED_STRUCT_HEADER', | |
| 14 UNEXPECTED_ARRAY_HEADER: 'VALIDATION_ERROR_UNEXPECTED_ARRAY_HEADER', | |
| 15 ILLEGAL_HANDLE: 'VALIDATION_ERROR_ILLEGAL_HANDLE', | |
| 16 UNEXPECTED_INVALID_HANDLE: 'VALIDATION_ERROR_UNEXPECTED_INVALID_HANDLE', | |
| 17 ILLEGAL_POINTER: 'VALIDATION_ERROR_ILLEGAL_POINTER', | |
| 18 UNEXPECTED_NULL_POINTER: 'VALIDATION_ERROR_UNEXPECTED_NULL_POINTER', | |
| 19 MESSAGE_HEADER_INVALID_FLAG_COMBINATION: | |
| 20 'VALIDATION_ERROR_MESSAGE_HEADER_INVALID_FLAG_COMBINATION', | |
| 21 MESSAGE_HEADER_MISSING_REQUEST_ID: | |
| 22 'VALIDATION_ERROR_MESSAGE_HEADER_MISSING_REQUEST_ID', | |
| 23 DIFFERENT_SIZED_ARRAYS_IN_MAP: | |
| 24 'VALIDATION_ERROR_DIFFERENT_SIZED_ARRAYS_IN_MAP', | |
| 25 }; | |
| 26 | |
| 27 var NULL_MOJO_POINTER = "NULL_MOJO_POINTER"; | |
| 28 | |
| 29 function isStringClass(cls) { | |
| 30 return cls === codec.String || cls === codec.NullableString; | |
| 31 } | |
| 32 | |
| 33 function isHandleClass(cls) { | |
| 34 return cls === codec.Handle || cls === codec.NullableHandle; | |
| 35 } | |
| 36 | |
| 37 function isNullable(type) { | |
| 38 return type === codec.NullableString || type === codec.NullableHandle || | |
| 39 type instanceof codec.NullableArrayOf || | |
| 40 type instanceof codec.NullablePointerTo; | |
| 41 } | |
| 42 | |
| 43 function Validator(message) { | |
| 44 this.message = message; | |
| 45 this.offset = 0; | |
| 46 this.handleIndex = 0; | |
| 47 } | |
| 48 | |
| 49 Object.defineProperty(Validator.prototype, "offsetLimit", { | |
| 50 get: function() { return this.message.buffer.byteLength; } | |
| 51 }); | |
| 52 | |
| 53 Object.defineProperty(Validator.prototype, "handleIndexLimit", { | |
| 54 get: function() { return this.message.handles.length; } | |
| 55 }); | |
| 56 | |
| 57 // True if we can safely allocate a block of bytes from start to | |
| 58 // to start + numBytes. | |
| 59 Validator.prototype.isValidRange = function(start, numBytes) { | |
| 60 // Only positive JavaScript integers that are less than 2^53 | |
| 61 // (Number.MAX_SAFE_INTEGER) can be represented exactly. | |
| 62 if (start < this.offset || numBytes <= 0 || | |
| 63 !Number.isSafeInteger(start) || | |
| 64 !Number.isSafeInteger(numBytes)) | |
| 65 return false; | |
| 66 | |
| 67 var newOffset = start + numBytes; | |
| 68 if (!Number.isSafeInteger(newOffset) || newOffset > this.offsetLimit) | |
| 69 return false; | |
| 70 | |
| 71 return true; | |
| 72 } | |
| 73 | |
| 74 Validator.prototype.claimRange = function(start, numBytes) { | |
| 75 if (this.isValidRange(start, numBytes)) { | |
| 76 this.offset = start + numBytes; | |
| 77 return true; | |
| 78 } | |
| 79 return false; | |
| 80 } | |
| 81 | |
| 82 Validator.prototype.claimHandle = function(index) { | |
| 83 if (index === codec.kEncodedInvalidHandleValue) | |
| 84 return true; | |
| 85 | |
| 86 if (index < this.handleIndex || index >= this.handleIndexLimit) | |
| 87 return false; | |
| 88 | |
| 89 // This is safe because handle indices are uint32. | |
| 90 this.handleIndex = index + 1; | |
| 91 return true; | |
| 92 } | |
| 93 | |
| 94 Validator.prototype.validateHandle = function(offset, nullable) { | |
| 95 var index = this.message.buffer.getUint32(offset); | |
| 96 | |
| 97 if (index === codec.kEncodedInvalidHandleValue) | |
| 98 return nullable ? | |
| 99 validationError.NONE : validationError.UNEXPECTED_INVALID_HANDLE; | |
| 100 | |
| 101 if (!this.claimHandle(index)) | |
| 102 return validationError.ILLEGAL_HANDLE; | |
| 103 return validationError.NONE; | |
| 104 } | |
| 105 | |
| 106 Validator.prototype.validateStructHeader = | |
| 107 function(offset, minNumBytes, minNumFields) { | |
| 108 if (!codec.isAligned(offset)) | |
| 109 return validationError.MISALIGNED_OBJECT; | |
| 110 | |
| 111 if (!this.isValidRange(offset, codec.kStructHeaderSize)) | |
| 112 return validationError.ILLEGAL_MEMORY_RANGE; | |
| 113 | |
| 114 var numBytes = this.message.buffer.getUint32(offset); | |
| 115 var numFields = this.message.buffer.getUint32(offset + 4); | |
| 116 | |
| 117 if (numBytes < minNumBytes || numFields < minNumFields) | |
| 118 return validationError.UNEXPECTED_STRUCT_HEADER; | |
| 119 | |
| 120 if (!this.claimRange(offset, numBytes)) | |
| 121 return validationError.ILLEGAL_MEMORY_RANGE; | |
| 122 | |
| 123 return validationError.NONE; | |
| 124 } | |
| 125 | |
| 126 Validator.prototype.validateMessageHeader = function() { | |
| 127 var err = this.validateStructHeader(0, codec.kMessageHeaderSize, 2); | |
| 128 if (err != validationError.NONE) | |
| 129 return err; | |
| 130 | |
| 131 var numBytes = this.message.getHeaderNumBytes(); | |
| 132 var numFields = this.message.getHeaderNumFields(); | |
| 133 | |
| 134 var validNumFieldsAndNumBytes = | |
| 135 (numFields == 2 && numBytes == codec.kMessageHeaderSize) || | |
| 136 (numFields == 3 && | |
| 137 numBytes == codec.kMessageWithRequestIDHeaderSize) || | |
| 138 (numFields > 3 && | |
| 139 numBytes >= codec.kMessageWithRequestIDHeaderSize); | |
| 140 if (!validNumFieldsAndNumBytes) | |
| 141 return validationError.UNEXPECTED_STRUCT_HEADER; | |
| 142 | |
| 143 var expectsResponse = this.message.expectsResponse(); | |
| 144 var isResponse = this.message.isResponse(); | |
| 145 | |
| 146 if (numFields == 2 && (expectsResponse || isResponse)) | |
| 147 return validationError.MESSAGE_HEADER_MISSING_REQUEST_ID; | |
| 148 | |
| 149 if (isResponse && expectsResponse) | |
| 150 return validationError.MESSAGE_HEADER_INVALID_FLAG_COMBINATION; | |
| 151 | |
| 152 return validationError.NONE; | |
| 153 } | |
| 154 | |
| 155 // Returns the message.buffer relative offset this pointer "points to", | |
| 156 // NULL_MOJO_POINTER if the pointer represents a null, or JS null if the | |
| 157 // pointer's value is not valid. | |
| 158 Validator.prototype.decodePointer = function(offset) { | |
| 159 var pointerValue = this.message.buffer.getUint64(offset); | |
| 160 if (pointerValue === 0) | |
| 161 return NULL_MOJO_POINTER; | |
| 162 var bufferOffset = offset + pointerValue; | |
| 163 return Number.isSafeInteger(bufferOffset) ? bufferOffset : null; | |
| 164 } | |
| 165 | |
| 166 Validator.prototype.validateArrayPointer = function( | |
| 167 offset, elementSize, elementType, nullable, expectedDimensionSizes, | |
| 168 currentDimension) { | |
| 169 var arrayOffset = this.decodePointer(offset); | |
| 170 if (arrayOffset === null) | |
| 171 return validationError.ILLEGAL_POINTER; | |
| 172 | |
| 173 if (arrayOffset === NULL_MOJO_POINTER) | |
| 174 return nullable ? | |
| 175 validationError.NONE : validationError.UNEXPECTED_NULL_POINTER; | |
| 176 | |
| 177 return this.validateArray(arrayOffset, elementSize, elementType, | |
| 178 expectedDimensionSizes, currentDimension); | |
| 179 } | |
| 180 | |
| 181 Validator.prototype.validateStructPointer = function( | |
| 182 offset, structClass, nullable) { | |
| 183 var structOffset = this.decodePointer(offset); | |
| 184 if (structOffset === null) | |
| 185 return validationError.ILLEGAL_POINTER; | |
| 186 | |
| 187 if (structOffset === NULL_MOJO_POINTER) | |
| 188 return nullable ? | |
| 189 validationError.NONE : validationError.UNEXPECTED_NULL_POINTER; | |
| 190 | |
| 191 return structClass.validate(this, structOffset); | |
| 192 } | |
| 193 | |
| 194 // This method assumes that the array at arrayPointerOffset has | |
| 195 // been validated. | |
| 196 | |
| 197 Validator.prototype.arrayLength = function(arrayPointerOffset) { | |
| 198 var arrayOffset = this.decodePointer(arrayPointerOffset); | |
| 199 return this.message.buffer.getUint32(arrayOffset + 4); | |
| 200 } | |
| 201 | |
| 202 Validator.prototype.validateMapPointer = function( | |
| 203 offset, mapIsNullable, keyClass, valueClass, valueIsNullable) { | |
| 204 // Validate the implicit map struct: | |
| 205 // struct {array<keyClass> keys; array<valueClass> values}; | |
| 206 var structOffset = this.decodePointer(offset); | |
| 207 if (structOffset === null) | |
| 208 return validationError.ILLEGAL_POINTER; | |
| 209 | |
| 210 if (structOffset === NULL_MOJO_POINTER) | |
| 211 return mapIsNullable ? | |
| 212 validationError.NONE : validationError.UNEXPECTED_NULL_POINTER; | |
| 213 | |
| 214 var mapEncodedSize = codec.kStructHeaderSize + codec.kMapStructPayloadSize; | |
| 215 var err = this.validateStructHeader(structOffset, mapEncodedSize, 2); | |
| 216 if (err !== validationError.NONE) | |
| 217 return err; | |
| 218 | |
| 219 // Validate the keys array. | |
| 220 var keysArrayPointerOffset = structOffset + codec.kStructHeaderSize; | |
| 221 err = this.validateArrayPointer( | |
| 222 keysArrayPointerOffset, keyClass.encodedSize, keyClass, false, [0], 0); | |
| 223 if (err !== validationError.NONE) | |
| 224 return err; | |
| 225 | |
| 226 // Validate the values array. | |
| 227 var valuesArrayPointerOffset = keysArrayPointerOffset + 8; | |
| 228 var valuesArrayDimensions = [0]; // Validate the actual length below. | |
| 229 if (valueClass instanceof codec.ArrayOf) | |
| 230 valuesArrayDimensions = | |
| 231 valuesArrayDimensions.concat(valueClass.dimensions()); | |
| 232 var err = this.validateArrayPointer(valuesArrayPointerOffset, | |
| 233 valueClass.encodedSize, | |
| 234 valueClass, | |
| 235 valueIsNullable, | |
| 236 valuesArrayDimensions, | |
| 237 0); | |
| 238 if (err !== validationError.NONE) | |
| 239 return err; | |
| 240 | |
| 241 // Validate the lengths of the keys and values arrays. | |
| 242 var keysArrayLength = this.arrayLength(keysArrayPointerOffset); | |
| 243 var valuesArrayLength = this.arrayLength(valuesArrayPointerOffset); | |
| 244 if (keysArrayLength != valuesArrayLength) | |
| 245 return validationError.DIFFERENT_SIZED_ARRAYS_IN_MAP; | |
| 246 | |
| 247 return validationError.NONE; | |
| 248 } | |
| 249 | |
| 250 Validator.prototype.validateStringPointer = function(offset, nullable) { | |
| 251 return this.validateArrayPointer( | |
| 252 offset, codec.Uint8.encodedSize, codec.Uint8, nullable, [0], 0); | |
| 253 } | |
| 254 | |
| 255 // Similar to Array_Data<T>::Validate() | |
| 256 // mojo/public/cpp/bindings/lib/array_internal.h | |
| 257 | |
| 258 Validator.prototype.validateArray = | |
| 259 function (offset, elementSize, elementType, expectedDimensionSizes, | |
| 260 currentDimension) { | |
| 261 if (!codec.isAligned(offset)) | |
| 262 return validationError.MISALIGNED_OBJECT; | |
| 263 | |
| 264 if (!this.isValidRange(offset, codec.kArrayHeaderSize)) | |
| 265 return validationError.ILLEGAL_MEMORY_RANGE; | |
| 266 | |
| 267 var numBytes = this.message.buffer.getUint32(offset); | |
| 268 var numElements = this.message.buffer.getUint32(offset + 4); | |
| 269 | |
| 270 // Note: this computation is "safe" because elementSize <= 8 and | |
| 271 // numElements is a uint32. | |
| 272 var elementsTotalSize = (elementType === codec.PackedBool) ? | |
| 273 Math.ceil(numElements / 8) : (elementSize * numElements); | |
| 274 | |
| 275 if (numBytes < codec.kArrayHeaderSize + elementsTotalSize) | |
| 276 return validationError.UNEXPECTED_ARRAY_HEADER; | |
| 277 | |
| 278 if (expectedDimensionSizes[currentDimension] != 0 && | |
| 279 numElements != expectedDimensionSizes[currentDimension]) { | |
| 280 return validationError.UNEXPECTED_ARRAY_HEADER; | |
| 281 } | |
| 282 | |
| 283 if (!this.claimRange(offset, numBytes)) | |
| 284 return validationError.ILLEGAL_MEMORY_RANGE; | |
| 285 | |
| 286 // Validate the array's elements if they are pointers or handles. | |
| 287 | |
| 288 var elementsOffset = offset + codec.kArrayHeaderSize; | |
| 289 var nullable = isNullable(elementType); | |
| 290 | |
| 291 if (isHandleClass(elementType)) | |
| 292 return this.validateHandleElements(elementsOffset, numElements, nullable); | |
| 293 if (isStringClass(elementType)) | |
| 294 return this.validateArrayElements( | |
| 295 elementsOffset, numElements, codec.Uint8, nullable, [0], 0); | |
| 296 if (elementType instanceof codec.PointerTo) | |
| 297 return this.validateStructElements( | |
| 298 elementsOffset, numElements, elementType.cls, nullable); | |
| 299 if (elementType instanceof codec.ArrayOf) | |
| 300 return this.validateArrayElements( | |
| 301 elementsOffset, numElements, elementType.cls, nullable, | |
| 302 expectedDimensionSizes, currentDimension + 1); | |
| 303 | |
| 304 return validationError.NONE; | |
| 305 } | |
| 306 | |
| 307 // Note: the |offset + i * elementSize| computation in the validateFooElements | |
| 308 // methods below is "safe" because elementSize <= 8, offset and | |
| 309 // numElements are uint32, and 0 <= i < numElements. | |
| 310 | |
| 311 Validator.prototype.validateHandleElements = | |
| 312 function(offset, numElements, nullable) { | |
| 313 var elementSize = codec.Handle.encodedSize; | |
| 314 for (var i = 0; i < numElements; i++) { | |
| 315 var elementOffset = offset + i * elementSize; | |
| 316 var err = this.validateHandle(elementOffset, nullable); | |
| 317 if (err != validationError.NONE) | |
| 318 return err; | |
| 319 } | |
| 320 return validationError.NONE; | |
| 321 } | |
| 322 | |
| 323 // The elementClass parameter is the element type of the element arrays. | |
| 324 Validator.prototype.validateArrayElements = | |
| 325 function(offset, numElements, elementClass, nullable, | |
| 326 expectedDimensionSizes, currentDimension) { | |
| 327 var elementSize = codec.PointerTo.prototype.encodedSize; | |
| 328 for (var i = 0; i < numElements; i++) { | |
| 329 var elementOffset = offset + i * elementSize; | |
| 330 var err = this.validateArrayPointer( | |
| 331 elementOffset, elementClass.encodedSize, elementClass, nullable, | |
| 332 expectedDimensionSizes, currentDimension); | |
| 333 if (err != validationError.NONE) | |
| 334 return err; | |
| 335 } | |
| 336 return validationError.NONE; | |
| 337 } | |
| 338 | |
| 339 Validator.prototype.validateStructElements = | |
| 340 function(offset, numElements, structClass, nullable) { | |
| 341 var elementSize = codec.PointerTo.prototype.encodedSize; | |
| 342 for (var i = 0; i < numElements; i++) { | |
| 343 var elementOffset = offset + i * elementSize; | |
| 344 var err = | |
| 345 this.validateStructPointer(elementOffset, structClass, nullable); | |
| 346 if (err != validationError.NONE) | |
| 347 return err; | |
| 348 } | |
| 349 return validationError.NONE; | |
| 350 } | |
| 351 | |
| 352 var exports = {}; | |
| 353 exports.validationError = validationError; | |
| 354 exports.Validator = Validator; | |
| 355 return exports; | |
| 356 }); | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 814543006:
Move //mojo/{public, edk} underneath //third_party (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master