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* [License] Simplify the Texture license to be pure Apache 2 (removing ASDK-Licenses) With permission of the Facebook Open Source team, we are simplifying the Texture license so that clients can rely on the Apache 2 terms that most of Texture is already covered by. This means that code originally forked from AsyncDisplayKit will be re-licensed from "BSD 3-clause + PATENTS v2" to Apache 2 without a PATENTS file. After getting confirmation that the updates to these core files look good, we'll propagate this new license header to all files (in this same PR) and get sign-off from all parties before landing. * [License] Update all Texture source files to be pure Apache 2. * Changelog entry for Apache 2 license update. * Revert "[License] Update all Texture source files to be pure Apache 2." This reverts commit ffa0fbbba9717d871dd16c4b07539f2f8208fc2b. * [License] Update all Texture source files to be pure Apache 2, maintaining copyrights. * [License] Update CONTRIBUTING, README, Podspec & Dangerfile.
62 lines
1.8 KiB
Objective-C
62 lines
1.8 KiB
Objective-C
//
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// ASCollections.m
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// Texture
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//
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// Copyright (c) Pinterest, Inc. All rights reserved.
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// Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
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//
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#import "ASCollections.h"
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/**
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* A private allocator that signals to our retain callback to skip the retain.
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* It behaves the same as the default allocator, but acts as a signal that we
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* are creating a transfer array so we should skip the retain.
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*/
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static CFAllocatorRef gTransferAllocator;
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static const void *ASTransferRetain(CFAllocatorRef allocator, const void *val) {
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if (allocator == gTransferAllocator) {
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// Transfer allocator. Ignore retain and pass through.
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return val;
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} else {
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// Other allocator. Retain like normal.
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// This happens when they make a mutable copy.
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return (&kCFTypeArrayCallBacks)->retain(allocator, val);
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}
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}
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@implementation NSArray (ASCollections)
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+ (NSArray *)arrayByTransferring:(__strong id *)pointers count:(NSUInteger)count NS_RETURNS_RETAINED
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{
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// Custom callbacks that point to our ASTransferRetain callback.
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static CFArrayCallBacks callbacks;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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callbacks = kCFTypeArrayCallBacks;
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callbacks.retain = ASTransferRetain;
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CFAllocatorContext ctx;
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CFAllocatorGetContext(NULL, &ctx);
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gTransferAllocator = CFAllocatorCreate(NULL, &ctx);
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});
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// NSZeroArray fast path.
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if (count == 0) {
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return @[]; // Does not actually call +array when optimized.
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}
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// NSSingleObjectArray fast path. Retain/release here is worth it.
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if (count == 1) {
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NSArray *result = [[NSArray alloc] initWithObjects:pointers count:1];
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pointers[0] = nil;
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return result;
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}
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NSArray *result = (__bridge_transfer NSArray *)CFArrayCreate(gTransferAllocator, (void *)pointers, count, &callbacks);
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memset(pointers, 0, count * sizeof(id));
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return result;
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}
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@end
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