Fix unzip bug (#7)

* Fix unzip bug

Author: fpseverino

Sources/Zip/Zip.swift

@@ -112,8 +112,8 @@ public class Zip {
             }
 
             let fullPath = destination.appendingPathComponent(pathString).standardized.path
-            // `.standardized` removes any ".. to move a level up".
-            // If we then check that the `fullPath` starts with the destination directory we know we are not extracting "outside" te destination.
+            // `.standardized` removes any `..` to move a level up.
+            // If we then check that the `fullPath` starts with the destination directory we know we are not extracting "outside" the destination.
             guard fullPath.starts(with: destination.standardized.path) else {
                 throw ZipError.unzipFail
             }
@@ -146,17 +146,18 @@ public class Zip {
             }
 
             var writeBytes: UInt64 = 0
-            while let filePointer = fopen(fullPath, "wb") {
-                defer { fclose(filePointer) }
+            let filePointer: UnsafeMutablePointer<FILE>? = fopen(fullPath, "wb")
+            while let filePointer {
                 let readBytes = unzReadCurrentFile(zip, &buffer, bufferSize)
-                if readBytes > 0 {
-                    guard fwrite(buffer, Int(readBytes), 1, filePointer) == 1 else {
-                        throw ZipError.unzipFail
-                    }
-                    writeBytes += UInt64(readBytes)
-                } else { break }
+                guard readBytes > 0 else { break }
+                guard fwrite(buffer, Int(readBytes), 1, filePointer) == 1 else {
+                    throw ZipError.unzipFail
+                }
+                writeBytes += UInt64(readBytes)
             }
 
+            if let filePointer { fclose(filePointer) }
+
             crc_ret = unzCloseCurrentFile(zip)
             if crc_ret == UNZ_CRCERROR {
                 throw ZipError.unzipFail
@@ -182,7 +183,7 @@ public class Zip {
 
             // Update progress handler
             if let progressHandler = progress {
-                progressHandler((currentPosition/totalSize))
+                progressHandler((currentPosition / totalSize))
             }
 
             if let fileHandler = fileOutputHandler,

Tests/ZipTests/ZipTests.swift

@@ -45,6 +45,8 @@ final class ZipTests: XCTestCase {
             try? FileManager.default.removeItem(at: destinationURL)
         }
         XCTAssertTrue(FileManager.default.fileExists(atPath: destinationURL.path))
+        try XCTAssertGreaterThan(Data(contentsOf: destinationURL.appendingPathComponent("3crBXeO.gif")).count, 0)
+        try XCTAssertGreaterThan(Data(contentsOf: destinationURL.appendingPathComponent("kYkLkPf.gif")).count, 0)
     }
 
     func testQuickUnzipNonExistingPath() {
@@ -59,12 +61,15 @@ final class ZipTests: XCTestCase {
 
     func testQuickUnzipProgress() throws {
         let filePath = url(forResource: "bb8", withExtension: "zip")!
-        let destinationURL = try Zip.quickUnzipFile(filePath, progress: { progress in
+        let destinationURL = try Zip.quickUnzipFile(filePath) { progress in
             XCTAssertFalse(progress.isNaN)
-        })
+        }
         addTeardownBlock {
             try? FileManager.default.removeItem(at: destinationURL)
         }
+        XCTAssertTrue(FileManager.default.fileExists(atPath: destinationURL.path))
+        try XCTAssertGreaterThan(Data(contentsOf: destinationURL.appendingPathComponent("3crBXeO.gif")).count, 0)
+        try XCTAssertGreaterThan(Data(contentsOf: destinationURL.appendingPathComponent("kYkLkPf.gif")).count, 0)
     }
 
     func testQuickUnzipOnlineURL() {
@@ -79,6 +84,8 @@ final class ZipTests: XCTestCase {
         XCTAssertNoThrow(try Zip.unzipFile(filePath, destination: destinationPath, overwrite: true, password: "password", progress: nil))
 
         XCTAssertTrue(FileManager.default.fileExists(atPath: destinationPath.path))
+        try XCTAssertGreaterThan(Data(contentsOf: destinationPath.appendingPathComponent("3crBXeO.gif")).count, 0)
+        try XCTAssertGreaterThan(Data(contentsOf: destinationPath.appendingPathComponent("kYkLkPf.gif")).count, 0)
     }
 
     func testImplicitProgressUnzip() throws {
@@ -113,7 +120,8 @@ final class ZipTests: XCTestCase {
         let imageURL1 = url(forResource: "3crBXeO", withExtension: "gif")!
         let imageURL2 = url(forResource: "kYkLkPf", withExtension: "gif")!
         let destinationURL = try Zip.quickZipFiles([imageURL1, imageURL2], fileName: "archive")
-        XCTAssertTrue(FileManager.default.fileExists(atPath:destinationURL.path))
+        XCTAssertTrue(FileManager.default.fileExists(atPath: destinationURL.path))
+        try XCTAssertGreaterThan(Data(contentsOf: destinationURL).count, 0)
         addTeardownBlock {
             try? FileManager.default.removeItem(at: destinationURL)
         }
@@ -126,6 +134,7 @@ final class ZipTests: XCTestCase {
             XCTAssertFalse(progress.isNaN)
         }
         XCTAssertTrue(FileManager.default.fileExists(atPath:destinationURL.path))
+        try XCTAssertGreaterThan(Data(contentsOf: destinationURL).count, 0)
         addTeardownBlock {
             try? FileManager.default.removeItem(at: destinationURL)
         }
@@ -337,6 +346,7 @@ final class ZipTests: XCTestCase {
         XCTAssert(FileManager.default.fileExists(atPath: destinationFolder.appendingPathComponent("metadata.json").path))
         XCTAssert(FileManager.default.fileExists(atPath: destinationFolder.appendingPathComponent("main/index.html").path))
         XCTAssert(FileManager.default.fileExists(atPath: destinationFolder.appendingPathComponent("main/index/index.json").path))
+        try XCTAssertGreaterThan(Data(contentsOf: destinationFolder.appendingPathComponent("metadata.json")).count, 0)
 
         let unzippedFiles = try FileManager.default.contentsOfDirectory(atPath: destinationFolder.path)
 
@@ -350,6 +360,7 @@ final class ZipTests: XCTestCase {
         XCTAssert(FileManager.default.fileExists(atPath: newDestinationFolder.appendingPathComponent("metadata.json").path))
         XCTAssert(FileManager.default.fileExists(atPath: newDestinationFolder.appendingPathComponent("main/index.html").path))
         XCTAssert(FileManager.default.fileExists(atPath: newDestinationFolder.appendingPathComponent("main/index/index.json").path))
+        try XCTAssertGreaterThan(Data(contentsOf: newDestinationFolder.appendingPathComponent("metadata.json")).count, 0)
 
         let newUnzippedFiles = try FileManager.default.contentsOfDirectory(atPath: newDestinationFolder.path)
         XCTAssertEqual(unzippedFiles, newUnzippedFiles)