[Issue #206] Fixed percent encoding issue for long chinese strings.

Alamofire.xcodeproj/project.pbxproj

@@ -28,6 +28,8 @@
 		4C341BBA1B1A865A00C1B34D /* CacheTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C341BB91B1A865A00C1B34D /* CacheTests.swift */; };
 		4C341BBB1B1A865A00C1B34D /* CacheTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C341BB91B1A865A00C1B34D /* CacheTests.swift */; };
 		4C3C53B21BAC5D40004F7F68 /* Alamofire.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = F8111E3319A95C8B0040E7D1 /* Alamofire.framework */; settings = {ASSET_TAGS = (); }; };
+		4C4CBE7B1BAF700C0024D659 /* String+AlamofireTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C4CBE7A1BAF700C0024D659 /* String+AlamofireTests.swift */; settings = {ASSET_TAGS = (); }; };
+		4C4CBE7C1BAF700C0024D659 /* String+AlamofireTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C4CBE7A1BAF700C0024D659 /* String+AlamofireTests.swift */; settings = {ASSET_TAGS = (); }; };
 		4C7C8D221B9D0D9000948136 /* NSURLSessionConfiguration+AlamofireTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C7C8D211B9D0D9000948136 /* NSURLSessionConfiguration+AlamofireTests.swift */; settings = {ASSET_TAGS = (); }; };
 		4C7C8D231B9D0D9000948136 /* NSURLSessionConfiguration+AlamofireTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C7C8D211B9D0D9000948136 /* NSURLSessionConfiguration+AlamofireTests.swift */; settings = {ASSET_TAGS = (); }; };
 		4C811F8D1B51856D00E0F59A /* ServerTrustPolicy.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4C811F8C1B51856D00E0F59A /* ServerTrustPolicy.swift */; };
@@ -149,6 +151,7 @@
 		4C33A1241B5207DB00873DFF /* unicorn.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; path = unicorn.png; sourceTree = "<group>"; };
 		4C33A1421B52089C00873DFF /* ServerTrustPolicyTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ServerTrustPolicyTests.swift; sourceTree = "<group>"; };
 		4C341BB91B1A865A00C1B34D /* CacheTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CacheTests.swift; sourceTree = "<group>"; };
+		4C4CBE7A1BAF700C0024D659 /* String+AlamofireTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "String+AlamofireTests.swift"; sourceTree = "<group>"; };
 		4C7C8D211B9D0D9000948136 /* NSURLSessionConfiguration+AlamofireTests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "NSURLSessionConfiguration+AlamofireTests.swift"; sourceTree = "<group>"; };
 		4C811F8C1B51856D00E0F59A /* ServerTrustPolicy.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ServerTrustPolicy.swift; sourceTree = "<group>"; };
 		4C812C3A1B535F220017E0BF /* alamofire-root-ca.cer */ = {isa = PBXFileReference; lastKnownFileType = file; name = "alamofire-root-ca.cer"; path = "alamofire.org/alamofire-root-ca.cer"; sourceTree = "<group>"; };
@@ -348,6 +351,7 @@
 			isa = PBXGroup;
 			children = (
 				4C7C8D211B9D0D9000948136 /* NSURLSessionConfiguration+AlamofireTests.swift */,
+				4C4CBE7A1BAF700C0024D659 /* String+AlamofireTests.swift */,
 			);
 			name = Extensions;
 			sourceTree = "<group>";
@@ -765,6 +769,7 @@
 				4C3238E71B3604DB00FE04AE /* MultipartFormDataTests.swift in Sources */,
 				4C33A1431B52089C00873DFF /* ServerTrustPolicyTests.swift in Sources */,
 				4C341BBA1B1A865A00C1B34D /* CacheTests.swift in Sources */,
+				4C4CBE7B1BAF700C0024D659 /* String+AlamofireTests.swift in Sources */,
 				4CA028C51B7466C500C84163 /* ResultTests.swift in Sources */,
 				4CCFA79A1B2BE71600B6F460 /* URLProtocolTests.swift in Sources */,
 				F86AEFE71AE6A312007D9C76 /* TLSEvaluationTests.swift in Sources */,
@@ -789,6 +794,7 @@
 				4C3238E81B3604DB00FE04AE /* MultipartFormDataTests.swift in Sources */,
 				4C33A1441B52089C00873DFF /* ServerTrustPolicyTests.swift in Sources */,
 				4C341BBB1B1A865A00C1B34D /* CacheTests.swift in Sources */,
+				4C4CBE7C1BAF700C0024D659 /* String+AlamofireTests.swift in Sources */,
 				4CA028C61B7466C500C84163 /* ResultTests.swift in Sources */,
 				4CCFA79B1B2BE71600B6F460 /* URLProtocolTests.swift in Sources */,
 				F829C6BE1A7A950600A2CD59 /* ParameterEncodingTests.swift in Sources */,

Source/ParameterEncoding.swift

@@ -212,6 +212,34 @@ public enum ParameterEncoding {
         let allowedCharacterSet = NSCharacterSet.URLQueryAllowedCharacterSet().mutableCopy() as! NSMutableCharacterSet
         allowedCharacterSet.removeCharactersInString(generalDelimitersToEncode + subDelimitersToEncode)
 
-        return string.stringByAddingPercentEncodingWithAllowedCharacters(allowedCharacterSet) ?? ""
+        //==========================================================================================================
+        //
+        //  Batching is required for escaping due to an internal bug in iOS 8.1 and 8.2. Encoding more than a few
+        //  hundred Chinense characters causes various malloc error crashes. To avoid this issue until iOS 8 is no
+        //  longer supported, batching MUST be used for encoding. This introduces roughly a 20% overhead. For more
+        //  info, please refer to:
+        //
+        //      - https://github.com/Alamofire/Alamofire/issues/206
+        //
+        //==========================================================================================================
+
+        let batchSize = 50
+        var index = string.startIndex
+
+        var escaped = ""
+
+        while index != string.endIndex {
+            let startIndex = index
+            let endIndex = index.advancedBy(batchSize, limit: string.endIndex)
+            let range = Range(start: startIndex, end: endIndex)
+
+            let substring = string.substringWithRange(range)
+
+            escaped += substring.stringByAddingPercentEncodingWithAllowedCharacters(allowedCharacterSet) ?? substring
+
+            index = endIndex
+        }
+
+        return escaped
     }
 }

Tests/ParameterEncodingTests.swift

@@ -31,8 +31,6 @@ class ParameterEncodingTestCase: BaseTestCase {
 // MARK: -
 
 class URLParameterEncodingTestCase: ParameterEncodingTestCase {
-    // MARK: Properties
-
     let encoding: ParameterEncoding = .URL
 
     // MARK: Tests - Parameter Types
@@ -350,6 +348,23 @@ class URLParameterEncodingTestCase: ParameterEncodingTestCase {
         XCTAssertEqual(URLRequest.URL?.query ?? "", "hd=%5B1%5D&%2Bfoo%2B=%2Bbar%2B", "query is incorrect")
     }
 
+    func testURLParameterEncodeStringWithThousandsOfChineseCharacters() {
+        // Given
+        let repeatedCount = 2_000
+        let URL = NSURL(string: "https://example.com/movies")!
+        let parameters = ["chinese": String(count: repeatedCount, repeatedString: "一二三四五六七八九十")]
+
+        // When
+        let (URLRequest, _) = encoding.encode(NSURLRequest(URL: URL), parameters: parameters)
+
+        // Then
+        var expected = "chinese="
+        for _ in 0..<repeatedCount {
+            expected += "%E4%B8%80%E4%BA%8C%E4%B8%89%E5%9B%9B%E4%BA%94%E5%85%AD%E4%B8%83%E5%85%AB%E4%B9%9D%E5%8D%81"
+        }
+        XCTAssertEqual(URLRequest.URL?.query ?? "", expected, "query is incorrect")
+    }
+
     // MARK: Tests - Varying HTTP Methods
 
     func testThatURLParameterEncodingEncodesGETParametersInURL() {

Tests/String+AlamofireTests.swift

@@ -0,0 +1,31 @@
+// NSURLSessionConfiguration+AlamofireTests.swift
+//
+// Copyright (c) 2014–2015 Alamofire Software Foundation (http://alamofire.org/)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+import Foundation
+
+extension String {
+    init(count: Int, repeatedString: String) {
+        var value = ""
+        for _ in 0..<count { value += repeatedString }
+        self = value
+    }
+}