50 lines
1.6 KiB
Swift
50 lines
1.6 KiB
Swift
//
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// PascalStringTranslator.swift
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// SwresTools
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//
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import Foundation
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struct PascalStringTranslator: Translator {
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@discardableResult func _looksLikePascalString(_ data: Data) throws -> Bool {
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guard data.count > 0 else {
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throw TranslatorError.unsupportedResource(reason: "Can't translate empty data.")
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}
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let length = data[0]
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guard data.count == Int(length) + 1 else {
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throw TranslatorError.unsupportedResource(reason: "Resource length doesn't match first byte prefix.")
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}
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return true
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}
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static private var _strType: FourCharCode = try! FourCharCode("STR ")
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func compatibilityWith(resource: Resource) -> TranslatorCompatibility {
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do {
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try _looksLikePascalString(resource.data)
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} catch {
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return TranslatorCompatibility.notCompatible
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}
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switch resource.type {
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case PascalStringTranslator._strType:
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return TranslatorCompatibility.likelyCompatible
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default:
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return TranslatorCompatibility.possiblyCompatible
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}
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}
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func translate(resource: Resource) throws -> Translation {
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let data = resource.data
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try _looksLikePascalString(data)
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let options = MacOSRomanConversionOptions(filterControlCharacters: false, filterFilesystemUnsafeCharacters: false, filterNonASCIICharacters: false, replacementMacOSRomanByte: nil)
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let string = stringFromMacOSRomanBytes(data.subdata(in: 1..<data.count), options: options)
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let stringData = string.data(using: String.Encoding.utf8)
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return Translation(data: stringData!, suggestedFileExtension: "txt")
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}
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}
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