Make resume work when redirecting

@@ -21,7 +21,7 @@
 #import "ASIInputStream.h"
 
 // Automatically set on build
-NSString *ASIHTTPRequestVersion = @"v1.5-51 2010-03-02";
+NSString *ASIHTTPRequestVersion = @"v1.5-52 2010-03-02";
 
 NSString* const NetworkRequestErrorDomain = @"ASIHTTPRequestErrorDomain";
 
@@ -2498,6 +2498,11 @@ static BOOL isiPhoneOS2;
 		// For bandwidth measurement / throttling
 		[ASIHTTPRequest incrementBandwidthUsedInLastSecond:bytesRead];
 		
+		// If we need to redirect, and have automatic redirect on, and might be resuming a download, let's do nothing with the content
+		if ([self needsRedirect] && [self shouldRedirect] && [self allowResumeForFileDownloads]) {
+			return;
+		}
+		
 		// Are we downloading to a file?
 		if ([self downloadDestinationPath]) {
 			if (![self fileDownloadOutputStream]) {
@@ -2554,15 +2559,19 @@ static BOOL isiPhoneOS2;
 		[[self fileDownloadOutputStream] close];
 		[self setFileDownloadOutputStream:nil];
 		
+		// If we are going to redirect and we are resuming, let's ignore this download
+		if ([self shouldRedirect] && [self needsRedirect] && [self allowResumeForFileDownloads]) {
+		
 		// Decompress the file (if necessary) directly to the destination path
-		if ([self isResponseCompressed]) {
+		} else if ([self isResponseCompressed]) {
 			int decompressionStatus = [ASIHTTPRequest uncompressZippedDataFromFile:[self temporaryFileDownloadPath] toFile:[self downloadDestinationPath]];
 			if (decompressionStatus != Z_OK) {
 				fileError = [NSError errorWithDomain:NetworkRequestErrorDomain code:ASIFileManagementError userInfo:[NSDictionary dictionaryWithObjectsAndKeys:[NSString stringWithFormat:@"Decompression of %@ failed with code %hi",[self temporaryFileDownloadPath],decompressionStatus],NSLocalizedDescriptionKey,nil]];
 			}
 			[self removeTemporaryDownloadFile];
 		} else {
-					
+			
+	
 			//Remove any file at the destination path
 			NSError *moveError = nil;
 			if ([[NSFileManager defaultManager] fileExistsAtPath:[self downloadDestinationPath]]) {

@@ -449,6 +449,60 @@
 	}
 }
 
+- (void)testRedirectedResume
+{
+	[self performSelectorOnMainThread:@selector(runRedirectedResume) withObject:nil waitUntilDone:YES];
+}
+
+- (void)runRedirectedResume
+{
+	NSURL *url = [NSURL URLWithString:@"http://allseeing-i.com/ASIHTTPRequest/tests/redirect_resume"];
+	NSString *temporaryPath = [[self filePathForTemporaryTestFiles] stringByAppendingPathComponent:@"foo.temp"];
+	
+	[@"" writeToFile:temporaryPath atomically:NO encoding:NSUTF8StringEncoding error:NULL];
+	
+	NSString *downloadPath = [[self filePathForTemporaryTestFiles] stringByAppendingPathComponent:@"foo.txt"];
+	
+	// Download part of a large file that is returned after a redirect
+	ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
+	[request setTemporaryFileDownloadPath:temporaryPath];
+	[request setDownloadDestinationPath:downloadPath];
+	[request setAllowResumeForFileDownloads:YES];
+	[request setAllowCompressedResponse:NO];
+	[request startAsynchronous];
+	
+	// Cancel the request as soon as it has downloaded 64KB
+	while (1) {
+		[[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.5]];
+		if ([request totalBytesRead] > 32*1024) {
+			[request cancel];
+			break;
+		}
+	}
+	NSNumber *fileSize =  [[[NSFileManager defaultManager] attributesOfItemAtPath:temporaryPath error:NULL] objectForKey:NSFileSize];
+	unsigned long long partialFileSize = [fileSize unsignedLongLongValue];
+	BOOL success = (partialFileSize < 1036935);
+	GHAssertTrue(success,@"Downloaded whole file too quickly, cannot proceed with this test");
+	
+	
+	
+	// Resume the download synchronously
+	request = [ASIHTTPRequest requestWithURL:url];
+	[request setTemporaryFileDownloadPath:temporaryPath];
+	[request setDownloadDestinationPath:downloadPath];
+	[request setAllowResumeForFileDownloads:YES];
+	[request setAllowCompressedResponse:NO];
+	[request startSynchronous];
+	
+	fileSize =  [[[NSFileManager defaultManager] attributesOfItemAtPath:downloadPath error:NULL] objectForKey:NSFileSize];
+	success = ([fileSize intValue] == 1036935);
+	GHAssertTrue(success,@"Downloaded file has wrong length");
+	
+	success = [[[request requestHeaders] objectForKey:@"Range"] isEqualToString:[NSString stringWithFormat:@"bytes=%llu-",partialFileSize]];
+	GHAssertTrue(success,@"Restarted download when we should have resumed, or asked for the wrong segment of the file");
+	
+}
+
 - (void)testUploadContentLength
 {
 	//This url will return the contents of the Content-Length request header