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Adding JS function to get the File Identifier (#4715) 

* Adding JS  function to get the File Identifier

* Update flatbuffers.js
This commit is contained in:
Mark Henderson 2018-04-23 12:54:20 -07:00 committed by Wouter van Oortmerssen
parent a66f9e769b
commit 34cb163e38
1 changed files with 20 additions and 0 deletions
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js/flatbuffers.js
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@ -1040,6 +1040,26 @@ flatbuffers.ByteBuffer.prototype.writeFloat64 = function(offset, value) {
this.writeInt32(offset + 4, flatbuffers.int32[flatbuffers.isLittleEndian ? 1 : 0]);
};
/**
* Return the file identifier. Behavior is undefined for FlatBuffers whose
* schema does not include a file_identifier (likely points at padding or the
* start of a the root vtable).
* @returns {string}
*/
flatbuffers.ByteBuffer.prototype.getBufferIdentifier = function() {
if (this.bytes_.length < this.position_ + flatbuffers.SIZEOF_INT +
flatbuffers.FILE_IDENTIFIER_LENGTH) {
throw new Error(
'FlatBuffers: ByteBuffer is too short to contain an identifier.');
}
var result = "";
for (var i = 0; i < flatbuffers.FILE_IDENTIFIER_LENGTH; i++) {
result += String.fromCharCode(
this.readInt8(this.position_ + flatbuffers.SIZEOF_INT + i));
}
return result;
};
/**
* Look up a field in the vtable, return an offset into the object, or 0 if the
* field is not present.