Mihaela Mihaljevic
2c375ac74b
A declared 16/32-bit encoding over BOM-less 8-bit bytes is rejected; a BOM followed by a declaration outside its family is rejected, reading the declaration through the BOM's own byte pattern; and an external entity whose text declaration names a higher XML version than the document is refused (errata E38). The eduni not-wf baseline is empty. Reader and decoder helpers split for the length caps. Closes #137
56 lines
2.5 KiB
Swift
56 lines
2.5 KiB
Swift
@testable import PureXML
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import Testing
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/// Encoding-declaration contradictions are fatal (#137, 4.3.3): a declared
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/// 16/32-bit encoding over 8-bit bytes, a declaration outside the BOM's
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/// family, and an external entity declaring a version above the document's
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/// (errata E38).
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@Suite("Encoding declaration mismatches")
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struct EncodingMismatchTests {
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@Test("UTF-16 declared over 8-bit bytes is rejected")
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func test_wideOverNarrow() {
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let bytes = Array("<?xml version=\"1.0\" encoding=\"UTF-16\"?>\n<root/>\n".utf8)
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#expect(throws: PureXML.Parsing.ParseError.self) {
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_ = try PureXML.Parsing.ByteDecoder.decode(bytes)
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}
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}
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@Test("A declaration outside the BOM's family is rejected")
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func test_bomContradiction() {
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// UTF-8 BOM + iso-8859-1 declaration.
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let utf8: [UInt8] = [0xEF, 0xBB, 0xBF] + Array("<?xml version='1.0' encoding='iso-8859-1'?><x/>".utf8)
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#expect(throws: PureXML.Parsing.ParseError.self) {
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_ = try PureXML.Parsing.ByteDecoder.decode(utf8)
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}
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// UTF-16BE BOM + iso-8859-1 declaration.
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var utf16: [UInt8] = [0xFE, 0xFF]
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for scalar in "<?xml version='1.0' encoding='iso-8859-1'?><x/>".unicodeScalars {
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utf16.append(0)
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utf16.append(UInt8(scalar.value))
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}
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#expect(throws: PureXML.Parsing.ParseError.self) {
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_ = try PureXML.Parsing.ByteDecoder.decode(utf16)
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}
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// Matching declarations stay accepted.
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let consistent: [UInt8] = [0xEF, 0xBB, 0xBF] + Array("<?xml version='1.0' encoding='UTF-8'?><x/>".utf8)
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#expect((try? PureXML.Parsing.ByteDecoder.decode(consistent)) != nil)
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}
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@Test("An external entity declaring a higher version is rejected (E38)")
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func test_entityVersionAboveDocument() {
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let xml = "<!DOCTYPE foo [<!ELEMENT foo ANY><!ENTITY e SYSTEM \"e.ent\">]>\n<foo>&e;</foo>"
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let resolver = PureXML.Parsing.EntityResolver(
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resolveEntity: { _, _ in "<?xml version=\"1.1\" encoding=\"utf-8\"?>ok" },
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resolveExternalSubset: { _ in nil },
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)
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#expect(throws: PureXML.Parsing.ParseError.self) {
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_ = try PureXML.parse(xml, limits: .init(allowDoctype: true), resolver: resolver)
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}
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let sameVersion = PureXML.Parsing.EntityResolver(
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resolveEntity: { _, _ in "<?xml version=\"1.0\" encoding=\"utf-8\"?>ok" },
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resolveExternalSubset: { _ in nil },
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)
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#expect((try? PureXML.parse(xml, limits: .init(allowDoctype: true), resolver: sameVersion)) != nil)
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}
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}
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