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[JS/TS] Size prefix support (#5326)

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* WIP size prefix support

* Consider size prefix in overloaded variant

* Work on code gen

* Disabled helper functions in code gen

* Enabled helper functions in code gen

* Fix size prefixed test

* Fix bad function call

* Add SIZE_PREFIX_LENGTH

* Fix review comments
This commit is contained in:
Björn Harrtell
2019-05-16 20:43:31 +02:00
committed by Wouter van Oortmerssen
parent b56d60f058
commit 0bb3ce6935
11 changed files with 370 additions and 61 deletions
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27
js/flatbuffers.js
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@@ -48,6 +48,12 @@ flatbuffers.SIZEOF_INT = 4;
*/
flatbuffers.FILE_IDENTIFIER_LENGTH = 4;
/**
* @type {number}
* @const
*/
flatbuffers.SIZE_PREFIX_LENGTH = 4;
/**
* @enum {number}
*/
@@ -676,12 +682,14 @@ outer_loop:
*
* @param {flatbuffers.Offset} root_table
* @param {string=} opt_file_identifier
* @param {boolean=} opt_size_prefix
*/
flatbuffers.Builder.prototype.finish = function(root_table, opt_file_identifier) {
flatbuffers.Builder.prototype.finish = function(root_table, opt_file_identifier, opt_size_prefix) {
var size_prefix = opt_size_prefix ? flatbuffers.SIZE_PREFIX_LENGTH : 0;
if (opt_file_identifier) {
var file_identifier = opt_file_identifier;
this.prep(this.minalign, flatbuffers.SIZEOF_INT +
flatbuffers.FILE_IDENTIFIER_LENGTH);
flatbuffers.FILE_IDENTIFIER_LENGTH + size_prefix);
if (file_identifier.length != flatbuffers.FILE_IDENTIFIER_LENGTH) {
throw new Error('FlatBuffers: file identifier must be length ' +
flatbuffers.FILE_IDENTIFIER_LENGTH);
@@ -690,11 +698,24 @@ flatbuffers.Builder.prototype.finish = function(root_table, opt_file_identifier)
this.writeInt8(file_identifier.charCodeAt(i));
}
}
this.prep(this.minalign, flatbuffers.SIZEOF_INT);
this.prep(this.minalign, flatbuffers.SIZEOF_INT + size_prefix);
this.addOffset(root_table);
if (size_prefix) {
this.addInt32(this.bb.capacity() - this.space);
}
this.bb.setPosition(this.space);
};
/**
* Finalize a size prefixed buffer, pointing to the given `root_table`.
*
* @param {flatbuffers.Offset} root_table
* @param {string=} opt_file_identifier
*/
flatbuffers.Builder.prototype.finishSizePrefixed = function (root_table, opt_file_identifier) {
this.finish(root_table, opt_file_identifier, true);
};
/// @cond FLATBUFFERS_INTERNAL
/**
* This checks a required field has been set in a given table that has