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[Swift] Add parsing from unowned UnsafeMutableRawPointer for ByteBuffer (#5981)

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* RFC: Add ExternalStorage for ByteBuffer in Swift implementation

This PR proposed one more API for ByteBuffer such that no copy is
required to parse FlatBuffers content. This API has limited use, but for
cases that you need to read part of the flatbuffers' data to decide
whether you want to parse / copy the full buffer out, it is useful.

* Use a variable rather than protocol.

* Revert grouping changes from the other PR.

* Add unit test to read from unowned UnsafePointer.

* Manifest changed.
This commit is contained in:
Liu Liu
2020-06-22 17:05:36 -07:00
committed by GitHub
parent b124b76258
commit f35184aef9
3 changed files with 37 additions and 4 deletions
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14
tests/FlatBuffers.Test.Swift/Tests/FlatBuffers.Test.SwiftTests/FlatBuffersMonsterWriterTests.swift
View File

@@ -15,7 +15,7 @@ class FlatBuffersMonsterWriterTests: XCTestCase {
readMonster(fb: _data)
}
func testReadFromOtherLangagues() {
func testReadFromOtherLanguages() {
let path = FileManager.default.currentDirectoryPath
let url = URL(fileURLWithPath: path, isDirectory: true).appendingPathComponent("monsterdata_test").appendingPathExtension("mon")
guard let data = try? Data(contentsOf: url) else { return }
@@ -44,6 +44,18 @@ class FlatBuffersMonsterWriterTests: XCTestCase {
let newBuf = FlatBuffersUtils.removeSizePrefix(bb: bytes.buffer)
readMonster(fb: newBuf)
}
func testReadMonsterFromUnsafePointerWithoutCopying() {
var array: [UInt8] = [48, 0, 0, 0, 77, 79, 78, 83, 0, 0, 0, 0, 36, 0, 72, 0, 40, 0, 0, 0, 38, 0, 32, 0, 0, 0, 28, 0, 0, 0, 27, 0, 20, 0, 16, 0, 12, 0, 4, 0, 0, 0, 0, 0, 0, 0, 11, 0, 36, 0, 0, 0, 164, 0, 0, 0, 0, 0, 0, 1, 60, 0, 0, 0, 68, 0, 0, 0, 76, 0, 0, 0, 0, 0, 0, 1, 88, 0, 0, 0, 120, 0, 0, 0, 0, 0, 80, 0, 0, 0, 128, 63, 0, 0, 0, 64, 0, 0, 64, 64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 64, 2, 0, 5, 0, 6, 0, 0, 0, 2, 0, 0, 0, 64, 0, 0, 0, 48, 0, 0, 0, 2, 0, 0, 0, 30, 0, 40, 0, 10, 0, 20, 0, 152, 255, 255, 255, 4, 0, 0, 0, 4, 0, 0, 0, 70, 114, 101, 100, 0, 0, 0, 0, 5, 0, 0, 0, 0, 1, 2, 3, 4, 0, 0, 0, 5, 0, 0, 0, 116, 101, 115, 116, 50, 0, 0, 0, 5, 0, 0, 0, 116, 101, 115, 116, 49, 0, 0, 0, 9, 0, 0, 0, 77, 121, 77, 111, 110, 115, 116, 101, 114, 0, 0, 0, 3, 0, 0, 0, 20, 0, 0, 0, 36, 0, 0, 0, 4, 0, 0, 0, 240, 255, 255, 255, 32, 0, 0, 0, 248, 255, 255, 255, 36, 0, 0, 0, 12, 0, 8, 0, 0, 0, 0, 0, 0, 0, 4, 0, 12, 0, 0, 0, 28, 0, 0, 0, 5, 0, 0, 0, 87, 105, 108, 109, 97, 0, 0, 0, 6, 0, 0, 0, 66, 97, 114, 110, 101, 121, 0, 0, 5, 0, 0, 0, 70, 114, 111, 100, 111, 0, 0, 0]
let unpacked = array.withUnsafeMutableBytes { (memory) -> MyGame.Example.MonsterT in
let bytes = ByteBuffer(assumingMemoryBound: memory.baseAddress!, capacity: memory.count)
var monster = Monster.getRootAsMonster(bb: bytes)
readFlatbufferMonster(monster: &monster)
let unpacked = monster.unpack()
return unpacked
}
readObjectApi(monster: unpacked)
}
func readMonster(fb: ByteBuffer) {
var monster = Monster.getRootAsMonster(bb: fb)

3
tests/FlatBuffers.Test.Swift/Tests/FlatBuffers.Test.SwiftTests/XCTestManifests.swift
View File

@@ -21,7 +21,8 @@ extension FlatBuffersMonsterWriterTests {
("testCreateMonsterPrefixed", testCreateMonsterPrefixed),
("testCreateMonsterResizedBuffer", testCreateMonsterResizedBuffer),
("testData", testData),
("testReadFromOtherLangagues", testReadFromOtherLangagues),
("testReadFromOtherLanguages", testReadFromOtherLanguages),
("testReadMonsterFromUnsafePointerWithoutCopying", testReadMonsterFromUnsafePointerWithoutCopying),
]
}