From c3b2f0e034ddabc63b5fe15f58289b1505dba65e Mon Sep 17 00:00:00 2001
From: Fabian Zwick <mail@efabian.me>
Date: Wed, 23 Oct 2024 10:08:53 +0200
Subject: [PATCH] Fix build on tvOS and Linux.

---
 Source/Mp3/Mp3FileReader.swift |  4 +--
 Source/Mp3/Mp3FileWriter.swift | 50 +++++++++++++++++++++++++---------
 2 files changed, 39 insertions(+), 15 deletions(-)

diff --git a/Source/Mp3/Mp3FileReader.swift b/Source/Mp3/Mp3FileReader.swift
index 126dfff6..db33fd5a 100644
--- a/Source/Mp3/Mp3FileReader.swift
+++ b/Source/Mp3/Mp3FileReader.swift
@@ -60,7 +60,7 @@ class Mp3FileReader {
 
         let readHandle = try FileHandle(forReadingFrom: URL(fileURLWithPath: path))
         defer {
-            if #available(iOS 13.0, *) {
+            if #available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *) {
                 try? readHandle.close()
             } else {
                 readHandle.closeFile()
@@ -84,7 +84,7 @@ class Mp3FileReader {
 
     private func read(bytesCount: Int, from fileHandle: FileHandle) throws -> Data {
         let result = try {
-            if #available(iOS 13.4, *) {
+            if #available(macOS 10.15.4, iOS 13.4, watchOS 6.2, tvOS 13.4, *) {
                 return try fileHandle.read(upToCount: bytesCount)
             } else {
                 return fileHandle.readData(ofLength: bytesCount)
diff --git a/Source/Mp3/Mp3FileWriter.swift b/Source/Mp3/Mp3FileWriter.swift
index acf08b3b..474b6788 100644
--- a/Source/Mp3/Mp3FileWriter.swift
+++ b/Source/Mp3/Mp3FileWriter.swift
@@ -19,23 +19,23 @@ class Mp3FileWriter {
             if toPath != fromPath {
                 return toPath
             }
-            
+
             return FileManager.default.temporaryDirectory.appendingPathComponent("\(UUID().uuidString).mp3").path
         }()
-        
+
         defer {
             if temporaryPath != toPath {
                 try? FileManager.default.removeItem(atPath: temporaryPath)
             }
         }
-        
+
         try eventuallyCreateIntermediatesDirectoriesFor(path: temporaryPath)
         try newId3TagData.write(to: URL(fileURLWithPath: temporaryPath))
-        
+
         // Create file handles
         let readHandle = try FileHandle(forReadingFrom: URL(fileURLWithPath: fromPath))
         defer {
-            if #available(iOS 13.0, *) {
+            if #available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *) {
                 try? readHandle.close()
             } else {
                 readHandle.closeFile()
@@ -44,7 +44,7 @@ class Mp3FileWriter {
 
         let writeHandle = try FileHandle(forWritingTo: URL(fileURLWithPath: temporaryPath))
         defer {
-            if #available(iOS 13.0, *) {
+            if #available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *) {
                 try? writeHandle.close()
             } else {
                 writeHandle.closeFile()
@@ -52,25 +52,25 @@ class Mp3FileWriter {
         }
 
         // Seek over the tag of the existing file, then copy the rest in chunks
-        if #available(iOS 13.4, *) {
+        if #available(macOS 10.15.4, iOS 13.4, watchOS 6.2, tvOS 13.4, *) {
             try writeHandle.seekToEnd()
         } else {
             writeHandle.seekToEndOfFile()
         }
 
         if let currentId3TagData = currentId3TagData {
-            if #available(iOS 13.0, *) {
+            if #available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *) {
                 try readHandle.seek(toOffset: UInt64(currentId3TagData.count))
             } else {
                 readHandle.seek(toFileOffset: UInt64(currentId3TagData.count))
             }
         }
-        
+
         var isFinished = false
         while !isFinished {
-            try autoreleasepool {
+            let work = {
                 let chunk = try {
-                    if #available(iOS 13.4, *) {
+                    if #available(macOS 10.15.4, iOS 13.4, watchOS 6.2, tvOS 13.4, *) {
                         return try readHandle.read(upToCount: 131072) // 128 KB
                     } else {
                         return readHandle.readData(ofLength: 131072) // 128 KB
@@ -78,7 +78,7 @@ class Mp3FileWriter {
                 }()
 
                 if let chunk, !chunk.isEmpty {
-                    if #available(iOS 13.4, *) {
+                    if #available(macOS 10.15.4, iOS 13.4, watchOS 6.2, tvOS 13.4, *) {
                         try writeHandle.write(contentsOf: chunk)
                     } else {
                         writeHandle.write(chunk)
@@ -87,11 +87,35 @@ class Mp3FileWriter {
                     isFinished = true
                 }
             }
+
+#if canImport(ObjectiveC)
+            // autoreleasepool is only needed in Objective-C environment (not on Linux)
+            try autoreleasepool(invoking: work)
+#else
+            try work()
+#endif
         }
-        
+
         // Replace the file
         if temporaryPath != toPath {
+#if os(Linux)
+            // For some reason the FileManager.replaceItemAt(_:withItemAt:) doesn't work on Linux and fails with `NSFileWriteUnknownError`
+            let backupPath = URL(fileURLWithPath: toPath).appendingPathExtension("tmp").path
+            try FileManager.default.copyItem(atPath: toPath, toPath: backupPath)
+            defer {
+                try? FileManager.default.removeItem(atPath: backupPath)
+            }
+
+            do {
+                try FileManager.default.removeItem(atPath: toPath)
+                try FileManager.default.copyItem(atPath: temporaryPath, toPath: toPath)
+            } catch {
+                try? FileManager.default.copyItem(atPath: backupPath, toPath: toPath)
+                throw error
+            }
+#else
             _ = try FileManager.default.replaceItemAt(validPath, withItemAt: URL(fileURLWithPath: temporaryPath))
+#endif
         }
     }