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//
// QNFile.m
// QiniuSDK
//
// Created by bailong on 15/7/25.
// Copyright (c) 2015年 Qiniu. All rights reserved.
//
#import "QNFile.h"
#import "QNResponseInfo.h"
@interface QNFile ()
@property (nonatomic, readonly) NSString *filepath;
@property (nonatomic) NSData *data;
@property (readonly) int64_t fileSize;
@property (readonly) int64_t fileModifyTime;
@property (nonatomic) NSFileHandle *file;
@property (nonatomic) NSLock *lock;
@end
@implementation QNFile
- (instancetype)init:(NSString *)path
error:(NSError *__autoreleasing *)error {
if (self = [super init]) {
_filepath = path;
NSError *error2 = nil;
NSDictionary *fileAttr = [[NSFileManager defaultManager] attributesOfItemAtPath:path error:&error2];
if (error2 != nil) {
if (error != nil) {
*error = error2;
}
return self;
}
_fileSize = [fileAttr fileSize];
NSDate *modifyTime = fileAttr[NSFileModificationDate];
int64_t t = 0;
if (modifyTime != nil) {
t = [modifyTime timeIntervalSince1970];
}
_fileModifyTime = t;
NSFileHandle *f = nil;
NSData *d = nil;
//[NSData dataWithContentsOfFile:filePath options:NSDataReadingMappedIfSafe error:&error] 不能用在大于 200M的文件上，改用filehandle
// 参见 https://issues.apache.org/jira/browse/CB-5790
if (_fileSize > 16 * 1024 * 1024) {
f = [NSFileHandle fileHandleForReadingAtPath:path];
if (f == nil) {
if (error != nil) {
*error = [[NSError alloc] initWithDomain:path code:kQNFileError userInfo:nil];
}
return self;
}
} else {
d = [NSData dataWithContentsOfFile:path options:NSDataReadingMappedIfSafe error:&error2];
if (error2 != nil) {
if (error != nil) {
*error = error2;
}
return self;
}
}
_file = f;
_data = d;
_lock = [[NSLock alloc] init];
}
return self;
}
- (NSData *)read:(long)offset
size:(long)size
error:(NSError **)error {
NSData *data = nil;
@try {
[_lock lock];
if (_data != nil) {
data = [_data subdataWithRange:NSMakeRange(offset, (unsigned int)size)];
} else {
[_file seekToFileOffset:offset];
data = [_file readDataOfLength:size];
}
} @catch (NSException *exception) {
*error = [NSError errorWithDomain:NSCocoaErrorDomain code:kQNFileError userInfo:@{NSLocalizedDescriptionKey : exception.reason}];
NSLog(@"read file failed reason: %@ \n%@", exception.reason, exception.callStackSymbols);
} @finally {
[_lock unlock];
}
return data;
}
- (NSData *)readAllWithError:(NSError **)error {
return [self read:0 size:(long)_fileSize error:error];
}
- (void)close {
if (_file != nil) {
[_file closeFile];
}
}
- (NSString *)path {
return _filepath;
}
- (int64_t)modifyTime {
return _fileModifyTime;
}
- (int64_t)size {
return _fileSize;
}
@end