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feat[js]: javascript support compatible field

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sun
2023-09-27 17:50:14 +08:00
parent 0547c0d727
commit 3dc261eac8
3 changed files with 70 additions and 4 deletions
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protocol/src/main/resources/javascript/buffer/ByteBuffer.js
+49
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@@ -49,6 +49,32 @@ const ByteBuffer = function() {
this.buffer = new ArrayBuffer(initSize);
this.bufferView = new DataView(this.buffer, 0, this.buffer.byteLength);
this.adjustPadding = function(predictionLength, beforeWriteIndex) {
const currentWriteIndex = this.writeOffset;
const predictionCount = this.writeIntCount(predictionLength);
const length = currentWriteIndex - beforeWriteIndex - predictionCount;
const lengthCount = this.writeIntCount(length);
const padding = lengthCount - predictionCount;
if (padding === 0) {
this.setWriteOffset(beforeWriteIndex);
this.writeInt(length);
this.setWriteOffset(currentWriteIndex);
} else {
const retainedByteBuf = this.buffer.slice(currentWriteIndex - length, currentWriteIndex);
this.setWriteOffset(beforeWriteIndex);
this.writeInt(length);
this.writeBytes(retainedByteBuf);
}
}
this.compatibleRead = function(beforeReadIndex, length) {
return length !== -1 && this.getReadOffset() < length + beforeReadIndex;
}
this.getWriteOffset = function() {
return this.writeOffset;
}
this.setWriteOffset = function(writeOffset) {
if (writeOffset > this.buffer.byteLength) {
throw new Error('index out of bounds exception: readerIndex: ' + this.readOffset +
@@ -58,6 +84,10 @@ const ByteBuffer = function() {
this.writeOffset = writeOffset;
};
this.getReadOffset = function() {
return this.readOffset;
}
this.setReadOffset = function(readOffset) {
if (readOffset > this.writeOffset) {
throw new Error('index out of bounds exception: readerIndex: ' + this.readOffset +
@@ -201,6 +231,25 @@ const ByteBuffer = function() {
this.writeByte(value >>> 28);
};
this.writeIntCount = function(value) {
if (!(minInt <= value && value <= maxInt)) {
throw new Error('value must range between minInt:-2147483648 and maxInt:2147483647');
}
if (value >>> 7 === 0) {
return 1;
}
if (value >>> 14 === 0) {
return 2;
}
if (value >>> 21 === 0) {
return 3;
}
if (value >>> 28 === 0) {
return 4;
}
return 5;
}
this.readInt = function() {
let b = this.readByte();
let value = b & 0x7F;