102 lines
3.1 KiB
Objective-C
102 lines
3.1 KiB
Objective-C
//
|
|
// StandardLZO.m
|
|
// TunnelKit
|
|
//
|
|
// Created by Davide De Rosa on 3/18/19.
|
|
// Copyright (c) 2020 Davide De Rosa. All rights reserved.
|
|
//
|
|
// https://github.com/passepartoutvpn
|
|
//
|
|
// This file is part of TunnelKit.
|
|
//
|
|
// TunnelKit is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// TunnelKit is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with TunnelKit. If not, see <http://www.gnu.org/licenses/>.
|
|
//
|
|
|
|
#import "minilzo.h"
|
|
|
|
#import "LZO.h"
|
|
#import "Errors.h"
|
|
|
|
#define HEAP_ALLOC(var,size) \
|
|
lzo_align_t __LZO_MMODEL var [ ((size) + (sizeof(lzo_align_t) - 1)) / sizeof(lzo_align_t) ]
|
|
|
|
#define LZO1X_1_15_MEM_COMPRESS ((lzo_uint32_t) (32768L * lzo_sizeof_dict_t))
|
|
|
|
static HEAP_ALLOC(wrkmem, LZO1X_1_MEM_COMPRESS);
|
|
|
|
@interface StandardLZO : NSObject <LZO>
|
|
|
|
@property (nonatomic, strong) NSMutableData *decompressedBuffer;
|
|
|
|
@end
|
|
|
|
@implementation StandardLZO
|
|
|
|
+ (NSString *)versionString
|
|
{
|
|
return [NSString stringWithCString:lzo_version_string() encoding:NSUTF8StringEncoding];
|
|
}
|
|
|
|
- (instancetype)init
|
|
{
|
|
if (lzo_init() != LZO_E_OK) {
|
|
NSLog(@"LZO engine failed to initialize");
|
|
abort();
|
|
return nil;
|
|
}
|
|
if ((self = [super init])) {
|
|
self.decompressedBuffer = [[NSMutableData alloc] initWithLength:LZO1X_1_15_MEM_COMPRESS];
|
|
}
|
|
return self;
|
|
}
|
|
|
|
- (NSData *)compressedDataWithData:(NSData *)data error:(NSError * _Nullable __autoreleasing * _Nullable)error
|
|
{
|
|
const NSInteger dstBufferLength = data.length + data.length / 16 + 64 + 3;
|
|
NSMutableData *dst = [[NSMutableData alloc] initWithLength:dstBufferLength];
|
|
lzo_uint dstLength;
|
|
const int status = lzo1x_1_compress(data.bytes, data.length, dst.mutableBytes, &dstLength, wrkmem);
|
|
if (status != LZO_E_OK) {
|
|
if (error) {
|
|
*error = TunnelKitErrorWithCode(TunnelKitErrorCodeLZO);
|
|
}
|
|
return nil;
|
|
}
|
|
if (dstLength > data.length) {
|
|
return nil;
|
|
}
|
|
dst.length = dstLength;
|
|
return dst;
|
|
}
|
|
|
|
- (NSData *)decompressedDataWithData:(NSData *)data error:(NSError * _Nullable __autoreleasing * _Nullable)error
|
|
{
|
|
return [self decompressedDataWithBytes:data.bytes length:data.length error:error];
|
|
}
|
|
|
|
- (NSData *)decompressedDataWithBytes:(const uint8_t *)bytes length:(NSInteger)length error:(NSError * _Nullable __autoreleasing * _Nullable)error
|
|
{
|
|
lzo_uint dstLength = LZO1X_1_15_MEM_COMPRESS;
|
|
const int status = lzo1x_decompress_safe(bytes, length, self.decompressedBuffer.mutableBytes, &dstLength, NULL);
|
|
if (status != LZO_E_OK) {
|
|
if (error) {
|
|
*error = TunnelKitErrorWithCode(TunnelKitErrorCodeLZO);
|
|
}
|
|
return nil;
|
|
}
|
|
return [NSData dataWithBytes:self.decompressedBuffer.bytes length:dstLength];
|
|
}
|
|
|
|
@end
|