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//
// SDLArtwork.m
// SmartDeviceLink-iOS
//
// Created by Joel Fischer on 10/15/15.
// Copyright © 2015 smartdevicelink. All rights reserved.
//
#import "SDLArtwork.h"
#import "SDLFileType.h"
#import <CommonCrypto/CommonDigest.h>
NS_ASSUME_NONNULL_BEGIN
@interface SDLArtwork ()
@property (strong, nonatomic) UIImage *image;
@end
@implementation SDLArtwork
#pragma mark - Lifecycle
+ (instancetype)artworkWithImage:(UIImage *)image name:(NSString *)name asImageFormat:(SDLArtworkImageFormat)imageFormat {
return [[self alloc] initWithImage:image name:name persistent:NO asImageFormat:imageFormat];
}
+ (instancetype)artworkWithImage:(UIImage *)image asImageFormat:(SDLArtworkImageFormat)imageFormat {
return [[self alloc] initWithImage:image persistent:NO asImageFormat:imageFormat];
}
+ (instancetype)persistentArtworkWithImage:(UIImage *)image name:(NSString *)name asImageFormat:(SDLArtworkImageFormat)imageFormat {
return [[self alloc] initWithImage:image name:name persistent:YES asImageFormat:imageFormat];
}
+ (instancetype)persistentArtworkWithImage:(UIImage *)image asImageFormat:(SDLArtworkImageFormat)imageFormat {
return [[self alloc] initWithImage:image persistent:YES asImageFormat:imageFormat];
}
#pragma mark Private Lifecycle
- (instancetype)initWithImage:(UIImage *)image name:(NSString *)name persistent:(BOOL)persistent asImageFormat:(SDLArtworkImageFormat)imageFormat {
return [super initWithData:[self.class sdl_dataForUIImage:image imageFormat:imageFormat] name:name fileExtension:[self.class sdl_fileExtensionForImageFormat:imageFormat] persistent:persistent];
}
- (instancetype)initWithImage:(UIImage *)image persistent:(BOOL)persistent asImageFormat:(SDLArtworkImageFormat)imageFormat {
NSData *imageData = [self.class sdl_dataForUIImage:image imageFormat:imageFormat];
NSString *imageName = [self.class sdl_md5HashFromNSData:imageData];
return [super initWithData:[self.class sdl_dataForUIImage:image imageFormat:imageFormat] name:(imageName != nil ? imageName : @"") fileExtension:[self.class sdl_fileExtensionForImageFormat:imageFormat] persistent:persistent];
}
/**
* Returns the JPG or PNG image data for a UIImage.
*
* @param image A UIImage
* @param imageFormat The image format to use when converting the UIImage to NSData
* @return The image data
*/
+ (NSData *)sdl_dataForUIImage:(UIImage *)image imageFormat:(SDLArtworkImageFormat)imageFormat {
NSData *imageData = nil;
switch (imageFormat) {
case SDLArtworkImageFormatPNG: {
imageData = UIImagePNGRepresentation(image);
} break;
case SDLArtworkImageFormatJPG: {
imageData = UIImageJPEGRepresentation(image, 0.85);
} break;
}
return imageData;
}
/**
* Returns the file extension for the image format.
*
* @param imageFormat Whether the image is a PNG or JPG
* @return The file extension for the image format
*/
+ (NSString *)sdl_fileExtensionForImageFormat:(SDLArtworkImageFormat)imageFormat {
NSString *fileExtension = nil;
switch (imageFormat) {
case SDLArtworkImageFormatPNG: {
fileExtension = @"png";
} break;
case SDLArtworkImageFormatJPG: {
fileExtension = @"jpg";
} break;
}
return fileExtension;
}
/**
* Creates a string representation of NSData by hashing the data using the MD5 hash function. This string is not guaranteed to be unique as collisions can occur, however collisions are extremely rare.
*
* Sourced from https://stackoverflow.com/questions/2018550/how-do-i-create-an-md5-hash-of-a-string-in-cocoa
*
* @param data The data to hash
* @return A MD5 hash of the data
*/
+ (NSString *)sdl_md5HashFromNSData:(NSData *)data {
if (data == nil) { return nil; }
unsigned char hash[CC_MD5_DIGEST_LENGTH];
CC_MD5([data bytes], (CC_LONG)[data length], hash);
NSMutableString *formattedHash = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i += 1) {
[formattedHash appendFormat:@"%02x", hash[i]];
}
return formattedHash;
}
@end
NS_ASSUME_NONNULL_END
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