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import XCTest
@testable import WasmKit
final class LEBTest: XCTestCase {
func testUnsigned() {
XCTAssertEqual(try UInt8(LEB: [0x00]), 0)
XCTAssertEqual(try UInt8(LEB: [0x01]), 1)
XCTAssertEqual(try UInt8(LEB: [0x7f]), 127)
XCTAssertEqual(try UInt8(LEB: [0x80, 0x01]), 128)
XCTAssertEqual(try UInt8(LEB: [0xFF, 0x01]), 255)
XCTAssertEqual(try UInt16(LEB: [0x00]), 0)
XCTAssertEqual(try UInt16(LEB: [0x7f]), 127)
XCTAssertEqual(try UInt16(LEB: [0x80, 0x01]), 128)
XCTAssertEqual(try UInt16(LEB: [0xff, 0xff, 0x3]), 0xffff)
XCTAssertEqual(try UInt32(LEB: [0x00]), 0)
XCTAssertEqual(try UInt32(LEB: [0x7f]), 127)
XCTAssertEqual(try UInt32(LEB: [0x80, 0x01]), 128)
XCTAssertEqual(try UInt32(LEB: [0xe5, 0x8e, 0x26]), 624485)
XCTAssertEqual(try UInt64(LEB: [0x00]), 0)
XCTAssertEqual(try UInt64(LEB: [0x7f]), 127)
XCTAssertEqual(try UInt64(LEB: [0x80, 0x01]), 128)
XCTAssertEqual(try UInt64(LEB: [0xe5, 0x8e, 0x26]), 624485)
XCTAssertThrowsError(try UInt8(LEB: [])) { error in
guard case LEBError.insufficientBytes = error else {
return XCTFail()
}
}
XCTAssertThrowsError(try UInt8(LEB: [0x80])) { error in
guard case LEBError.insufficientBytes = error else {
return XCTFail()
}
}
XCTAssertThrowsError(try UInt8(LEB: [0x80, 0x02])) { error in
guard case LEBError.overflow = error else {
return XCTFail("Unexpected error: \(error)")
}
}
XCTAssertThrowsError(try UInt16(LEB: [0x80, 0x80, 0x04])) { error in
guard case LEBError.overflow = error else {
return XCTFail("Unexpected error: \(error)")
}
}
XCTAssertThrowsError(try UInt32(LEB: [0x80, 0x80, 0x80, 0x80, 0x16])) { error in
guard case LEBError.overflow = error else {
return XCTFail("Unexpected error: \(error)")
}
}
XCTAssertThrowsError(try UInt64(LEB: [0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x02])) { error in
guard case LEBError.overflow = error else {
return XCTFail("Unexpected error: \(error)")
}
}
}
func testSigned() {
XCTAssertEqual(try Int8(LEB: [0x00]), 0)
XCTAssertEqual(try Int8(LEB: [0x01]), 1)
XCTAssertEqual(try Int8(LEB: [0x7f]), -1)
XCTAssertEqual(try Int8(LEB: [0xff, 0x00]), 127)
XCTAssertEqual(try Int8(LEB: [0x81, 0x7f]), -127)
XCTAssertEqual(try Int8(LEB: [0x80, 0x7f]), -128)
XCTAssertEqual(try Int16(LEB: [0x00]), 0)
XCTAssertEqual(try Int16(LEB: [0x01]), 1)
XCTAssertEqual(try Int16(LEB: [0x7f]), -1)
XCTAssertEqual(try Int16(LEB: [0xff, 0x00]), 127)
XCTAssertEqual(try Int16(LEB: [0x81, 0x7f]), -127)
XCTAssertEqual(try Int16(LEB: [0x80, 0x7f]), -128)
XCTAssertEqual(try Int16(LEB: [0x81, 1]), 129)
XCTAssertEqual(try Int16(LEB: [0xff, 0x7e]), -129)
XCTAssertThrowsError(try Int32(LEB: [0x80, 0x80, 0x80, 0x80, 0x70])) { error in
guard case LEBError.overflow = error else {
return XCTFail("Unexpected error: \(error)")
}
}
XCTAssertThrowsError(try Int8(LEB: [])) { error in
guard case LEBError.insufficientBytes = error else {
return XCTFail("Unexpected error: \(error)")
}
}
XCTAssertThrowsError(try Int8(LEB: [0x80])) { error in
guard case LEBError.insufficientBytes = error else {
return XCTFail("Unexpected error: \(error)")
}
}
}
}
extension FixedWidthInteger where Self: UnsignedInteger {
fileprivate init(LEB bytes: [UInt8]) throws {
var iterator = bytes.makeIterator()
try self.init(LEB: { iterator.next() })
}
}
extension FixedWidthInteger where Self: SignedInteger {
fileprivate init(LEB bytes: [UInt8]) throws {
var iterator = bytes.makeIterator()
try self.init(LEB: { iterator.next() })
}
}
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