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//
// GTMNSData+zlibTest.m
//
// Copyright 2007-2008 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy
// of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
//
#import <SenTestingKit/SenTestingKit.h>
#import "GTMSenTestCase.h"
#import "GTMNSData+zlib.h"
#import <stdlib.h> // for randiom/srandomdev
#import <zlib.h>
@interface GTMNSData_zlibTest : SenTestCase
@end
static void FillWithRandom(char *data, unsigned long len) {
char *max = data + len;
for ( ; data < max ; ++data) {
*data = random() & 0xFF;
}
}
static BOOL HasGzipHeader(NSData *data) {
// very simple check
if ([data length] > 2) {
const unsigned char *bytes = [data bytes];
return (bytes[0] == 0x1f) && (bytes[1] == 0x8b);
}
return NO;
}
@implementation GTMNSData_zlibTest
- (void)setUp {
// seed random from /dev/random
srandomdev();
}
- (void)testInflateDeflate {
// generate a range of sizes w/ random content
for (int n = 0 ; n < 2 ; ++n) {
for (int x = 1 ; x < 128 ; ++x) {
NSAutoreleasePool *localPool = [[NSAutoreleasePool alloc] init];
STAssertNotNil(localPool, @"failed to alloc local pool");
NSMutableData *data = [NSMutableData data];
STAssertNotNil(data, @"failed to alloc data block");
// first pass small blocks, second pass, larger ones, but second pass
// avoid making them multimples of 128.
[data setLength:((n*x*128) + x)];
FillWithRandom([data mutableBytes], [data length]);
// w/ *Bytes apis, default level
NSData *deflated = [NSData gtm_dataByDeflatingBytes:[data bytes] length:[data length]];
STAssertNotNil(deflated, @"failed to deflate data block");
STAssertGreaterThan([deflated length], 0U, @"failed to deflate data block");
STAssertFalse(HasGzipHeader(deflated), @"has gzip header on zlib data");
NSData *dataPrime = [NSData gtm_dataByInflatingBytes:[deflated bytes] length:[deflated length]];
STAssertNotNil(dataPrime, @"failed to inflate data block");
STAssertGreaterThan([dataPrime length], 0U, @"failed to inflate data block");
STAssertEqualObjects(data, dataPrime, @"failed to round trip via *Bytes apis");
// w/ *Data apis, default level
deflated = [NSData gtm_dataByDeflatingData:data];
STAssertNotNil(deflated, @"failed to deflate data block");
STAssertGreaterThan([deflated length], 0U, @"failed to deflate data block");
STAssertFalse(HasGzipHeader(deflated), @"has gzip header on zlib data");
dataPrime = [NSData gtm_dataByInflatingData:deflated];
STAssertNotNil(dataPrime, @"failed to inflate data block");
STAssertGreaterThan([dataPrime length], 0U, @"failed to inflate data block");
STAssertEqualObjects(data, dataPrime, @"failed to round trip via *Data apis");
// loop over the compression levels
for (int level = 1 ; level < 9 ; ++level) {
// w/ *Bytes apis, using our level
deflated = [NSData gtm_dataByDeflatingBytes:[data bytes]
length:[data length]
compressionLevel:level];
STAssertNotNil(deflated, @"failed to deflate data block");
STAssertGreaterThan([deflated length], 0U, @"failed to deflate data block");
STAssertFalse(HasGzipHeader(deflated), @"has gzip header on zlib data");
dataPrime = [NSData gtm_dataByInflatingBytes:[deflated bytes] length:[deflated length]];
STAssertNotNil(dataPrime, @"failed to inflate data block");
STAssertGreaterThan([dataPrime length], 0U, @"failed to inflate data block");
STAssertEqualObjects(data, dataPrime, @"failed to round trip via *Bytes apis");
// w/ *Data apis, using our level
deflated = [NSData gtm_dataByDeflatingData:data compressionLevel:level];
STAssertNotNil(deflated, @"failed to deflate data block");
STAssertGreaterThan([deflated length], 0U, @"failed to deflate data block");
STAssertFalse(HasGzipHeader(deflated), @"has gzip header on zlib data");
dataPrime = [NSData gtm_dataByInflatingData:deflated];
STAssertNotNil(dataPrime, @"failed to inflate data block");
STAssertGreaterThan([dataPrime length], 0U, @"failed to inflate data block");
STAssertEqualObjects(data, dataPrime, @"failed to round trip via *Data apis");
}
[localPool release];
}
}
}
- (void)testInflateGzip {
// generate a range of sizes w/ random content
for (int n = 0 ; n < 2 ; ++n) {
for (int x = 1 ; x < 128 ; ++x) {
NSAutoreleasePool *localPool = [[NSAutoreleasePool alloc] init];
STAssertNotNil(localPool, @"failed to alloc local pool");
NSMutableData *data = [NSMutableData data];
STAssertNotNil(data, @"failed to alloc data block");
// first pass small blocks, second pass, larger ones, but second pass
// avoid making them multimples of 128.
[data setLength:((n*x*128) + x)];
FillWithRandom([data mutableBytes], [data length]);
// w/ *Bytes apis, default level
NSData *gzipped = [NSData gtm_dataByGzippingBytes:[data bytes] length:[data length]];
STAssertNotNil(gzipped, @"failed to gzip data block");
STAssertGreaterThan([gzipped length], 0U, @"failed to gzip data block");
STAssertTrue(HasGzipHeader(gzipped), @"doesn't have gzip header on gzipped data");
NSData *dataPrime = [NSData gtm_dataByInflatingBytes:[gzipped bytes] length:[gzipped length]];
STAssertNotNil(dataPrime, @"failed to inflate data block");
STAssertGreaterThan([dataPrime length], 0U, @"failed to inflate data block");
STAssertEqualObjects(data, dataPrime, @"failed to round trip via *Bytes apis");
// w/ *Data apis, default level
gzipped = [NSData gtm_dataByGzippingData:data];
STAssertNotNil(gzipped, @"failed to gzip data block");
STAssertGreaterThan([gzipped length], 0U, @"failed to gzip data block");
STAssertTrue(HasGzipHeader(gzipped), @"doesn't have gzip header on gzipped data");
dataPrime = [NSData gtm_dataByInflatingData:gzipped];
STAssertNotNil(dataPrime, @"failed to inflate data block");
STAssertGreaterThan([dataPrime length], 0U, @"failed to inflate data block");
STAssertEqualObjects(data, dataPrime, @"failed to round trip via *Data apis");
// loop over the compression levels
for (int level = 1 ; level < 9 ; ++level) {
// w/ *Bytes apis, using our level
gzipped = [NSData gtm_dataByGzippingBytes:[data bytes]
length:[data length]
compressionLevel:level];
STAssertNotNil(gzipped, @"failed to gzip data block");
STAssertGreaterThan([gzipped length], 0U, @"failed to gzip data block");
STAssertTrue(HasGzipHeader(gzipped), @"doesn't have gzip header on gzipped data");
dataPrime = [NSData gtm_dataByInflatingBytes:[gzipped bytes] length:[gzipped length]];
STAssertNotNil(dataPrime, @"failed to inflate data block");
STAssertGreaterThan([dataPrime length], 0U, @"failed to inflate data block");
STAssertEqualObjects(data, dataPrime, @"failed to round trip via *Bytes apis");
// w/ *Data apis, using our level
gzipped = [NSData gtm_dataByGzippingData:data compressionLevel:level];
STAssertNotNil(gzipped, @"failed to gzip data block");
STAssertGreaterThan([gzipped length], 0U, @"failed to gzip data block");
STAssertTrue(HasGzipHeader(gzipped), @"doesn't have gzip header on gzipped data");
dataPrime = [NSData gtm_dataByInflatingData:gzipped];
STAssertNotNil(dataPrime, @"failed to inflate data block");
STAssertGreaterThan([dataPrime length], 0U, @"failed to inflate data block");
STAssertEqualObjects(data, dataPrime, @"failed to round trip via *Data apis");
}
[localPool release];
}
}
}
@end
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