diff --git a/Objective-Zip Tests/Objective-Zip_Swift_Tests.swift b/Objective-Zip Tests/Objective-Zip_Swift_Tests.swift
index 72217c9..a33fa73 100644
--- a/Objective-Zip Tests/Objective-Zip_Swift_Tests.swift	
+++ b/Objective-Zip Tests/Objective-Zip_Swift_Tests.swift	
@@ -140,12 +140,7 @@ class Objective_Zip_Swift_Tests: XCTestCase {
             NSLog("Test 1: reading from first file's stream...")
             
             let data1 = NSMutableData(length:256)!
-
-            var error : NSError?
-            let bytesRead1 = read1.readDataWithBuffer(data1, error:&error)
-            if error != nil {
-                throw error!
-            }
+            let bytesRead1 = try read1.readDataWithBuffer(data1)
             
             XCTAssertEqual(3, bytesRead1)
             
@@ -167,11 +162,7 @@ class Objective_Zip_Swift_Tests: XCTestCase {
             NSLog("Test 1: reading from second file's stream...")
             
             let data2 = NSMutableData(length:256)!
-
-            let bytesRead2 = read2.readDataWithBuffer(data2, error:&error)
-            if error != nil {
-                throw error!
-            }
+            let bytesRead2 = try read2.readDataWithBuffer(data2)
             
             XCTAssertEqual(3, bytesRead2)
             
@@ -201,11 +192,11 @@ class Objective_Zip_Swift_Tests: XCTestCase {
         }
     }
     
+    /* 
+     * Uncomment to execute this test, but be careful: takes 5 minutes and consumes 5 GB of disk space
+     *
     func test02ZipAndUnzip5GB() {
     
-        // TODO Remove to enable this test, but be careful: takes 5 minutes and consumes 5 GB of disk space
-        return
-        
         let documentsUrl = NSURL(fileURLWithPath:NSHomeDirectory(), isDirectory:true).URLByAppendingPathComponent("Documents")
         let fileUrl = documentsUrl.URLByAppendingPathComponent("huge_test.zip")
         let filePath = fileUrl.path!
@@ -286,13 +277,9 @@ class Objective_Zip_Swift_Tests: XCTestCase {
             NSLog("Test 2: reading from file's stream...")
             
             for (var i = 0; i < HUGE_TEST_NUMBER_OF_BLOCKS; i++) {
-                var error : NSError?
-                let bytesRead = read.readDataWithBuffer(buffer, error:&error)
-                if error != nil {
-                    throw error!
-                }
+                let bytesRead = try read.readDataWithBuffer(buffer)
                 
-                XCTAssertEqual(UInt(data.length), bytesRead)
+                XCTAssertEqual(data.length, bytesRead)
                 
                 let range = buffer.rangeOfData(checkData, options:NSDataSearchOptions(), range:NSMakeRange(0, buffer.length))
                 
@@ -319,6 +306,7 @@ class Objective_Zip_Swift_Tests: XCTestCase {
             XCTFail("Error caught: \(error.code) - \(error.userInfo[NSLocalizedFailureReasonErrorKey])")
         }
     }
+     */
     
     func test03UnzipMacZipFile() -> () {
         let documentsUrl = NSURL(fileURLWithPath:NSHomeDirectory(), isDirectory:true).URLByAppendingPathComponent("Documents")
@@ -355,12 +343,7 @@ class Objective_Zip_Swift_Tests: XCTestCase {
             NSLog("Test 3: reading from file's stream...")
             
             let buffer = NSMutableData(length:1024)!
-            
-            var error : NSError?
-            let bytesRead = read.readDataWithBuffer(buffer, error:&error)
-            if error != nil {
-                throw error!
-            }
+            let bytesRead = try read.readDataWithBuffer(buffer)
             
             let fileText = NSString(bytes:buffer.bytes, length:Int(bytesRead), encoding:NSUTF8StringEncoding)
             
@@ -418,12 +401,7 @@ class Objective_Zip_Swift_Tests: XCTestCase {
             NSLog("Test 4: reading from file's stream...")
             
             let buffer = NSMutableData(length:1024)!
-            
-            var error : NSError?
-            let bytesRead = read.readDataWithBuffer(buffer, error:&error)
-            if error != nil {
-                throw error!
-            }
+            let bytesRead = try read.readDataWithBuffer(buffer)
             
             let fileText = NSString(bytes:buffer.bytes, length:Int(bytesRead), encoding:NSUTF8StringEncoding)
             
diff --git a/Objective-Zip Tests/ObjectiveZip_Tests.m b/Objective-Zip Tests/ObjectiveZip_Tests.m
index df595e6..ec2164d 100644
--- a/Objective-Zip Tests/ObjectiveZip_Tests.m	
+++ b/Objective-Zip Tests/ObjectiveZip_Tests.m	
@@ -208,11 +208,11 @@
     }
 }
 
+/* 
+ * Uncomment to execute this test, but be careful: takes 5 minutes and consumes 5 GB of disk space
+ *
 - (void) test02ZipAndUnzip5GB {
-    
-// TODO Remove to enable this test, but be careful: takes 5 minutes and consumes 5 GB of disk space
-    return;
-    
+ 
     NSString *documentsDir= [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
     NSString *filePath= [documentsDir stringByAppendingPathComponent:@"huge_test.zip"];
     
@@ -319,6 +319,7 @@
         [[NSFileManager defaultManager] removeItemAtPath:filePath error:NULL];
     }
 }
+ */
 
 - (void) test03UnzipMacZipFile {
     NSString *documentsDir= [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
diff --git a/Objective-Zip/OZZipFile+NSError.h b/Objective-Zip/OZZipFile+NSError.h
index 945ce42..b8d8c0d 100644
--- a/Objective-Zip/OZZipFile+NSError.h
+++ b/Objective-Zip/OZZipFile+NSError.h
@@ -34,6 +34,17 @@
 #import "OZZipFile.h"
 
 
+/**
+ @brief Indicates the file could not be located in the zip file.
+ */
+static const NSInteger OZLocateFileResultNotFound= -1;
+
+/**
+ @brief Indicates the file has been successfully located in the zip file.
+ */
+static const NSInteger OZLocateFileResultFound= 1;
+
+
 @interface OZZipFile (NSError)
 
 
@@ -211,13 +222,16 @@
  <code>readCurrentFileInZip</code>.</p>
  @param error If passed, may be filled with an NSError is case the file can't
  be located.
- @return <code>YES</code> if the file has been located and selected,
- <code>NO</code> if the specified file name is not present in the zip file or
- the file could not be located due to an error.
+ @return <code>OZLocateFileResultFound</code> if the file has been located
+ and selected, <code>OZLocateFileResultNotFound</code> if the specified
+ file name is not present in the zip file, or <code>0</code> if the file could
+ not be located due to an error.
+ <br/>NOTE: return value convention is different in the standard (non-NSError
+ compliant) interface.
  @throws OZZipException If the zip file has been opened with a mode other than
  Unzip.
  */
-- (BOOL) locateFileInZip:(nonnull NSString *)fileNameInZip error:(NSError * __autoreleasing __nullable * __nullable)error;
+- (NSInteger) __attribute__((swift_error(zero_result))) locateFileInZip:(nonnull NSString *)fileNameInZip error:(NSError * __autoreleasing __nullable * __nullable)error;
 
 /**
  @brief Returns the number of files contained in the zip file.
@@ -228,7 +242,7 @@
  @throws OZZipException If the zip file has been opened with a mode other
  than Unzip.
  */
-- (NSUInteger) numFilesInZipWithError:(NSError * __autoreleasing __nullable * __nullable)error;
+- (NSUInteger) __attribute__((swift_error(zero_result))) numFilesInZipWithError:(NSError * __autoreleasing __nullable * __nullable)error;
 
 /**
  @brief Returns a list of OZFileInZipInfo with the information on all the files
diff --git a/Objective-Zip/OZZipFile+Standard.h b/Objective-Zip/OZZipFile+Standard.h
index 0619ca5..244abc5 100644
--- a/Objective-Zip/OZZipFile+Standard.h
+++ b/Objective-Zip/OZZipFile+Standard.h
@@ -199,6 +199,8 @@
  <code>readCurrentFileInZip</code>.</p>
  @return <code>YES</code> if the file has been located and selected,
  <code>NO</code> if the specified file name is not present in the zip file.
+ <br/>NOTE: return value convention is different in NSError compliant
+ interface.
  @throws OZZipException If the file can't be located due to an error or if the
  zip file has been opened with a mode other than Unzip.
  */
diff --git a/Objective-Zip/OZZipFile.m b/Objective-Zip/OZZipFile.m
index 4825652..1538597 100644
--- a/Objective-Zip/OZZipFile.m
+++ b/Objective-Zip/OZZipFile.m
@@ -444,12 +444,13 @@
     } ERROR_WRAP_END_AND_RETURN(error, NO);
 }
 
-- (BOOL) locateFileInZip:(NSString *)fileNameInZip error:(NSError * __autoreleasing *)error {
+- (NSInteger) locateFileInZip:(NSString *)fileNameInZip error:(NSError * __autoreleasing *)error {
     ERROR_WRAP_BEGIN {
         
-        return [self locateFileInZip:fileNameInZip];
+        BOOL located= [self locateFileInZip:fileNameInZip];
+        return (located ? OZLocateFileResultFound : OZLocateFileResultNotFound);
         
-    } ERROR_WRAP_END_AND_RETURN(error, NO);
+    } ERROR_WRAP_END_AND_RETURN(error, 0);
 }
 
 - (NSUInteger) numFilesInZipWithError:(NSError * __autoreleasing *)error {
diff --git a/Objective-Zip/OZZipReadStream+NSError.h b/Objective-Zip/OZZipReadStream+NSError.h
index 8cde39d..a4e16b1 100644
--- a/Objective-Zip/OZZipReadStream+NSError.h
+++ b/Objective-Zip/OZZipReadStream+NSError.h
@@ -34,6 +34,12 @@
 #import "OZZipReadStream.h"
 
 
+/**
+ @brief Indicates the end of the file has been reached.
+ */
+static const NSInteger OZReadStreamResultEndOfFile= -1;
+
+
 @interface OZZipReadStream (NSError)
 
 
@@ -46,10 +52,13 @@
  @param buffer The buffer where read and uncompressed data must be stored.
  @param error If passed, may be filled with an NSError is case data could
  not be read.
- @return The number of uncompressed bytes read, <code>0</code> if the end of
- the file has been reached or data could not be read due to an error.
+ @return The number of uncompressed bytes read, <code>OZReadStreamResultEndOfFile</code>
+ if the end of the file has been reached, or <code>0</code>
+ if data could not be read due to an error.
+ <br/>NOTE: return value convention is different in the standard (non-NSError
+ compliant) interface.
  */
-- (NSUInteger) readDataWithBuffer:(nonnull NSMutableData *)buffer error:(NSError * __autoreleasing __nullable * __nullable)error;
+- (NSInteger) __attribute__((swift_error(zero_result))) readDataWithBuffer:(nonnull NSMutableData *)buffer error:(NSError * __autoreleasing __nullable * __nullable)error;
 
 /**
  @brief Closes the read steam.
diff --git a/Objective-Zip/OZZipReadStream+Standard.h b/Objective-Zip/OZZipReadStream+Standard.h
index 8dfa654..859c0f4 100644
--- a/Objective-Zip/OZZipReadStream+Standard.h
+++ b/Objective-Zip/OZZipReadStream+Standard.h
@@ -46,6 +46,8 @@
  @param buffer The buffer where read and uncompressed data must be stored.
  @return The number of uncompressed bytes read, <code>0</code> if the end of
  the file has been reached.
+ <br/>NOTE: return value convention is different in NSError compliant
+ interface.
  @throws OZZipException If the data could not be read due to an error.
  */
 - (NSUInteger) readDataWithBuffer:(nonnull NSMutableData *)buffer;
diff --git a/Objective-Zip/OZZipReadStream.m b/Objective-Zip/OZZipReadStream.m
index 45f4baa..e1cb72b 100644
--- a/Objective-Zip/OZZipReadStream.m
+++ b/Objective-Zip/OZZipReadStream.m
@@ -93,10 +93,11 @@
 #pragma mark -
 #pragma mark Reading data (NSError variants)
 
-- (NSUInteger) readDataWithBuffer:(NSMutableData *)buffer error:(NSError * __autoreleasing *)error {
+- (NSInteger) readDataWithBuffer:(NSMutableData *)buffer error:(NSError * __autoreleasing *)error {
     ERROR_WRAP_BEGIN {
         
-        return [self readDataWithBuffer:buffer];
+        NSUInteger bytesRead= [self readDataWithBuffer:buffer];
+        return (bytesRead == 0) ? OZReadStreamResultEndOfFile : bytesRead;
         
     } ERROR_WRAP_END_AND_RETURN(error, 0);
 }
diff --git a/Objective-Zip/OZZipWriteStream+NSError.h b/Objective-Zip/OZZipWriteStream+NSError.h
index 6ef2f5c..d804dc0 100644
--- a/Objective-Zip/OZZipWriteStream+NSError.h
+++ b/Objective-Zip/OZZipWriteStream+NSError.h
@@ -47,6 +47,8 @@
  @param data The data to be compressed and written.
  @param error If passed, may be filled with an NSError is case data could
  not be written.
+ @return <code>YES</code> if data has been written, <code>NO</code> if
+ data could not be written due to an error.
  */
 - (BOOL) writeData:(nonnull NSData *)data error:(NSError * __autoreleasing __nullable * __nullable)error;