{"id":22562321,"url":"https://github.com/mdietrichstein/objc-murmur3-bloomfilter","last_synced_at":"2025-10-28T03:04:08.545Z","repository":{"id":73366527,"uuid":"66478575","full_name":"mdietrichstein/objc-murmur3-bloomfilter","owner":"mdietrichstein","description":"Bloom filter implementation using murmur3 hashing written in Objective-C","archived":false,"fork":false,"pushed_at":"2017-05-18T12:45:10.000Z","size":9,"stargazers_count":3,"open_issues_count":0,"forks_count":0,"subscribers_count":1,"default_branch":"master","last_synced_at":"2025-07-04T07:05:29.497Z","etag":null,"topics":["algorithm","bloom-filter","bloom-filters","hash","ios","murmur3-hashing","objective-c","probability"],"latest_commit_sha":null,"homepage":null,"language":"Objective-C","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":null,"status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/mdietrichstein.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":null,"code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2016-08-24T16:00:19.000Z","updated_at":"2022-11-05T05:14:59.000Z","dependencies_parsed_at":null,"dependency_job_id":"7409b082-68c9-4b12-ba21-659f56ef70d8","html_url":"https://github.com/mdietrichstein/objc-murmur3-bloomfilter","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"purl":"pkg:github/mdietrichstein/objc-murmur3-bloomfilter","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/mdietrichstein%2Fobjc-murmur3-bloomfilter","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/mdietrichstein%2Fobjc-murmur3-bloomfilter/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/mdietrichstein%2Fobjc-murmur3-bloomfilter/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/mdietrichstein%2Fobjc-murmur3-bloomfilter/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/mdietrichstein","download_url":"https://codeload.github.com/mdietrichstein/objc-murmur3-bloomfilter/tar.gz/refs/heads/master","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/mdietrichstein%2Fobjc-murmur3-bloomfilter/sbom","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":263464185,"owners_count":23470473,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["algorithm","bloom-filter","bloom-filters","hash","ios","murmur3-hashing","objective-c","probability"],"created_at":"2024-12-07T22:12:32.874Z","updated_at":"2025-10-28T03:04:08.463Z","avatar_url":"https://github.com/mdietrichstein.png","language":"Objective-C","funding_links":[],"categories":[],"sub_categories":[],"readme":"# Objective-C Bloom Filter implementation\n\nAn Objective-C Bloom Filter implementation using 128 Bit (x64) Murmur3 Hashing. Hashes are generated using the Double Hashing Methond described in [Less Hashing, Same Performance: Building a Better Bloom Filter](https://www.eecs.harvard.edu/~michaelm/postscripts/tr-02-05.pdf). \n\n## Usage\n\n```objc\nNSUInteger expectedNumberOfItems = 10000;\ndouble falsePositiveRate = 0.01;\nuint32_t seed = 1234;\n    \nBloomFilter *bloomFilter = [[BloomFilter alloc] initWithExceptedNumberOfItems:expectedNumberOfItems falsePositiveRate:falsePositiveRate seed:seed];\n\n// Containment\nNSString *containedId = [[NSUUID UUID] UUIDString];\nNSData *containedData = [containedId dataUsingEncoding:NSUTF8StringEncoding];\n \n[bloomFilter add:containedData];\nNSAssert([bloomFilter contains:containedData] == YES);\n\nNSString *invalidId = [[NSUUID UUID] UUIDString];\nNSData *invalidData = [containedId dataUsingEncoding:NSUTF8StringEncoding];\nNSAssert([bloomFilter contains:invalidData] == NO);\n\n// Serialization\n\nBloomFilter *deserializedBloomFilter = [[BloomFilter alloc] initWithData:bloomFilter.data exceptedNumberOfItems:expectedNumberOfItems falsePositivePercentage:falsePositiveRate seed:seed];\n\nNSAssert([deserializedBloomFilter contains:containedData] == YES);\nNSAssert([deserializedBloomFilter contains:invalidData] == NO);\n```\n\n## Resources\n\n* [Bloom Filter (Wikipedia)](https://en.wikipedia.org/wiki/Bloom_filter)\n* [Murmur3 hash implementation (C++)](https://github.com/aappleby/smhasher/blob/master/src/MurmurHash3.cpp)\n* [Less Hashing, Same Performance: Building a Better Bloom Filter (pdf)](https://www.eecs.harvard.edu/~michaelm/postscripts/tr-02-05.pdf)\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmdietrichstein%2Fobjc-murmur3-bloomfilter","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fmdietrichstein%2Fobjc-murmur3-bloomfilter","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmdietrichstein%2Fobjc-murmur3-bloomfilter/lists"}