| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_SERIALIZATION_SERIALIZATION_TAG_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_BINDINGS_CORE_V8_SERIALIZATION_SERIALIZATION_TAG_H_ |
| |
| namespace blink { |
| |
| // Serialization format is a sequence of tags followed by zero or more data |
| // arguments. Tags always take exactly one byte. A serialized stream first |
| // begins with a complete VersionTag. If the stream does not begin with a |
| // VersionTag, we assume that the stream is in format 0. |
| |
| // Tags which are not interpreted by Blink (but instead by V8) are omitted here. |
| |
| // This format is private to the implementation of SerializedScriptValue. Do not |
| // rely on it externally. It is safe to persist a SerializedScriptValue as a |
| // binary blob, but this code should always be used to interpret it. |
| |
| // WebCoreStrings are read as (length:uint32_t, string:UTF8[length]). |
| // RawStrings are read as (length:uint32_t, string:UTF8[length]). |
| // RawUCharStrings are read as |
| // (length:uint32_t, string:UChar[length/sizeof(UChar)]). |
| // RawFiles are read as |
| // (path:WebCoreString, url:WebCoreStrng, type:WebCoreString). |
| // There is a reference table that maps object references (uint32_t) to |
| // v8::Values. |
| // Tokens marked with (ref) are inserted into the reference table and given the |
| // next object reference ID after decoding. |
| // All tags except InvalidTag, PaddingTag, ReferenceCountTag, VersionTag, |
| // GenerateFreshObjectTag and GenerateFreshArrayTag push their results to the |
| // deserialization stack. |
| // There is also an 'open' stack that is used to resolve circular references. |
| // Objects or arrays may contain self-references. Before we begin to deserialize |
| // the contents of these values, they are first given object reference IDs (by |
| // GenerateFreshObjectTag/GenerateFreshArrayTag); these reference IDs are then |
| // used with ObjectReferenceTag to tie the recursive knot. |
| enum SerializationTag { |
| kMessagePortTag = 'M', // index:int -> MessagePort. Fills the result with |
| // transferred MessagePort. |
| kMojoHandleTag = 'h', // index:int -> MojoHandle. Fills the result with |
| // transferred MojoHandle. |
| kBlobTag = 'b', // uuid:WebCoreString, type:WebCoreString, size:uint64_t -> |
| // Blob (ref) |
| kBlobIndexTag = 'i', // index:int32_t -> Blob (ref) |
| kFileTag = 'f', // file:RawFile -> File (ref) |
| kFileIndexTag = 'e', // index:int32_t -> File (ref) |
| kDOMFileSystemTag = 'd', // type:int32_t, name:WebCoreString, |
| // uuid:WebCoreString -> FileSystem (ref) |
| kFileSystemFileHandleTag = 'n', // name:WebCoreString, index:uint32_t |
| // -> FileSystemFileHandle (ref) |
| kFileSystemDirectoryHandleTag = 'N', // name:WebCoreString, index:uint32_t -> |
| // FileSystemDirectoryHandle (ref) |
| kFileListTag = |
| 'l', // length:uint32_t, files:RawFile[length] -> FileList (ref) |
| kFileListIndexTag = |
| 'L', // length:uint32_t, files:int32_t[length] -> FileList (ref) |
| kImageDataTag = '#', // tags terminated by ImageSerializationTag::kEnd (see |
| // SerializedColorParams.h), width:uint32_t, |
| // height:uint32_t, pixelDataLength:uint64_t, |
| // data:byte[pixelDataLength] |
| // -> ImageData (ref) |
| kImageBitmapTag = 'g', // tags terminated by ImageSerializationTag::kEnd (see |
| // SerializedColorParams.h), width:uint32_t, |
| // height:uint32_t, pixelDataLength:uint32_t, |
| // data:byte[pixelDataLength] |
| // -> ImageBitmap (ref) |
| kImageBitmapTransferTag = |
| 'G', // index:uint32_t -> ImageBitmap. For ImageBitmap transfer |
| kOffscreenCanvasTransferTag = 'H', // index, width, height, id, |
| // filter_quality::uint32_t -> |
| // OffscreenCanvas. For OffscreenCanvas |
| // transfer |
| kReadableStreamTransferTag = 'r', // index:uint32_t |
| kTransformStreamTransferTag = 'm', // index:uint32_t |
| kWritableStreamTransferTag = 'w', // index:uint32_t |
| kDOMPointTag = 'Q', // x:Double, y:Double, z:Double, w:Double |
| kDOMPointReadOnlyTag = 'W', // x:Double, y:Double, z:Double, w:Double |
| kDOMRectTag = 'E', // x:Double, y:Double, width:Double, height:Double |
| kDOMRectReadOnlyTag = 'R', // x:Double, y:Double, width:Double, height:Double |
| kDOMQuadTag = 'T', // p1:Double, p2:Double, p3:Double, p4:Double |
| kDOMMatrixTag = 'Y', // m11..m44: 16 Double |
| kDOMMatrixReadOnlyTag = 'U', // m11..m44: 16 Double |
| kDOMMatrix2DTag = 'I', // a..f: 6 Double |
| kDOMMatrix2DReadOnlyTag = 'O', // a..f: 6 Double |
| kCryptoKeyTag = 'K', // subtag:byte, props, usages:uint32_t, |
| // keyDataLength:uint32_t, keyData:byte[keyDataLength] |
| // If subtag=AesKeyTag: |
| // props = keyLengthBytes:uint32_t, algorithmId:uint32_t |
| // If subtag=HmacKeyTag: |
| // props = keyLengthBytes:uint32_t, hashId:uint32_t |
| // If subtag=RsaHashedKeyTag: |
| // props = algorithmId:uint32_t, type:uint32_t, |
| // modulusLengthBits:uint32_t, |
| // publicExponentLength:uint32_t, |
| // publicExponent:byte[publicExponentLength], |
| // hashId:uint32_t |
| // If subtag=EcKeyTag: |
| // props = algorithmId:uint32_t, type:uint32_t, |
| // namedCurve:uint32_t |
| kRTCCertificateTag = 'k', // length:uint32_t, pemPrivateKey:WebCoreString, |
| // pemCertificate:WebCoreString |
| kRTCEncodedAudioFrameTag = 'A', // uint32_t -> transferred audio frame ID |
| kRTCEncodedVideoFrameTag = 'V', // uint32_t -> transferred video frame ID |
| |
| kVideoFrameTag = 'v', // uint32_t -> transferred video frame ID |
| |
| // The following tags were used by the Shape Detection API implementation |
| // between M71 and M81. During these milestones, the API was always behind |
| // a flag. Usage was removed in https://crrev.com/c/2040378. |
| kDeprecatedDetectedBarcodeTag = 'B', |
| kDeprecatedDetectedFaceTag = 'F', |
| kDeprecatedDetectedTextTag = 't', |
| |
| kDOMExceptionTag = 'x', // name:String,message:String,stack:String |
| kVersionTag = 0xFF // version:uint32_t -> Uses this as the file version. |
| }; |
| |
| } // namespace blink |
| |
| #endif |
