cdc_chunkers/
supercdc.rs

1use crate::{Chunk, SizeParams};
2use std::cmp::min;
3use std::collections::HashMap;
4
5const MIN_CHUNK_SIZE: usize = 1024 * 4;
6const AVG_CHUNK_SIZE: usize = 1024 * 8;
7const MAX_CHUNK_SIZE: usize = 1024 * 64;
8
9// 8KB, 4KB and 2KB masks
10const MASK_S: u64 = 0b1111_1111_1111;
11const MASK_L: u64 = 0b111_1111_1111;
12const MASK_B: u64 = 0b11_1111_1111;
13
14const MASK_S_LS: u64 = MASK_B << 1;
15const MASK_L_LS: u64 = MASK_L << 1;
16const MASK_B_LS: u64 = MASK_B << 1;
17
18pub struct Chunker<'a> {
19    buf: &'a [u8],
20    records: HashMap<u64, usize>,
21    last_hash: u64,
22    record_last_hash: bool,
23    pos: usize,
24    shelved: Option<usize>,
25    sizes: SizeParams,
26}
27
28impl<'a> Chunker<'a> {
29    pub fn default_sizes() -> SizeParams {
30        SizeParams {
31            min: MIN_CHUNK_SIZE,
32            avg: AVG_CHUNK_SIZE,
33            max: MAX_CHUNK_SIZE,
34        }
35    }
36
37    pub fn new(buf: &'a [u8]) -> Self {
38        Self {
39            buf,
40            pos: 0,
41            records: Default::default(),
42            last_hash: 0,
43            record_last_hash: false,
44            shelved: None,
45            sizes: Self::default_sizes(),
46        }
47    }
48
49    pub fn with_records(buf: &'a [u8], records: HashMap<u64, usize>, sizes: SizeParams) -> Self {
50        Self {
51            buf,
52            records,
53            last_hash: 0,
54            record_last_hash: false,
55            pos: 0,
56            shelved: None,
57            sizes,
58        }
59    }
60
61    fn use_record_map(&mut self, hash: u64, length: usize) -> Option<usize> {
62        if self.record_last_hash {
63            self.records.insert(self.last_hash, length);
64        }
65
66        if let Some(&found_length) = self.records.get(&hash) {
67            self.record_last_hash = false;
68            if self.pos + found_length < self.buf.len() {
69                return Some(found_length);
70            }
71        } else {
72            self.record_last_hash = true;
73        }
74
75        self.last_hash = hash;
76        None
77    }
78
79    fn find_border(&mut self, buf: &[u8]) -> Option<(u64, usize)> {
80        if buf.is_empty() {
81            return None;
82        }
83
84        let len = buf.len();
85        if len < self.sizes.min {
86            let length = self.buf.len() - self.pos;
87            return Some((0, length));
88        }
89
90        let remaining = min(self.sizes.max, len);
91        let center = min(self.sizes.avg, len);
92
93        let mut breakpoint = remaining;
94        let mut breakpoint_flag = false;
95
96        let mut fingerprint: u64 = 0;
97        let mut pos: usize = self.sizes.min / 2;
98
99        let mut breakpoint_gear = 0;
100        let mut gear;
101
102        for index in 1..16 {
103            fingerprint =
104                fingerprint.wrapping_add(GEAR[buf[self.sizes.min - index] as usize] << index);
105            pos += 1;
106        }
107
108        while pos < center / 2 {
109            let a = pos * 2;
110            gear = GEAR_LS[buf[a] as usize];
111            fingerprint = (fingerprint << 2).wrapping_add(gear);
112            if fingerprint & MASK_S_LS == 0 {
113                return Some((gear, a));
114            }
115            gear = GEAR[buf[a + 1] as usize];
116            fingerprint = fingerprint.wrapping_add(gear);
117            if fingerprint & MASK_S == 0 {
118                return Some((gear, a + 1));
119            }
120            pos += 1;
121        }
122
123        while pos < remaining / 2 {
124            let a = pos * 2;
125            gear = GEAR_LS[buf[a] as usize];
126            fingerprint = (fingerprint << 2).wrapping_add(gear);
127            if fingerprint & MASK_L_LS == 0 {
128                return Some((gear, a));
129            }
130            if !breakpoint_flag && fingerprint & MASK_B_LS == 0 {
131                breakpoint_flag = true;
132                breakpoint = a;
133                breakpoint_gear = gear;
134            }
135
136            gear = GEAR[buf[a + 1] as usize];
137            fingerprint = fingerprint.wrapping_add(gear);
138            if fingerprint & MASK_L == 0 {
139                return Some((gear, a + 1));
140            }
141            if !breakpoint_flag && fingerprint & MASK_B == 0 {
142                breakpoint_flag = true;
143                breakpoint = a + 1;
144                breakpoint_gear = gear;
145            }
146            pos += 1;
147        }
148
149        if pos == remaining / 2 {
150            return Some((breakpoint_gear, breakpoint));
151        }
152
153        Some((breakpoint_gear, breakpoint))
154    }
155
156    pub fn give_records(self) -> HashMap<u64, usize> {
157        self.records
158    }
159}
160
161impl<'a> Iterator for Chunker<'a> {
162    type Item = Chunk;
163
164    fn next(&mut self) -> Option<Self::Item> {
165        if let Some(length) = self.shelved {
166            self.shelved = None;
167
168            let chunk = Chunk::new(self.pos, length);
169            self.pos += length;
170            return Some(chunk);
171        }
172
173        let search_range = self.pos..self.buf.len();
174        if let Some((hash, length)) = self.find_border(&self.buf[search_range]) {
175            let chunk = Chunk::new(self.pos, length);
176
177            self.pos += length;
178
179            if let Some(length) = self.use_record_map(hash, length) {
180                self.shelved = Some(length);
181            }
182
183            Some(chunk)
184        } else {
185            None
186        }
187    }
188}
189
190// Gear table taken from https://github.com/nlfiedler/fastcdc-rs
191#[rustfmt::skip]
192const GEAR: [u64; 256] = [
193    0x3b5d3c7d207e37dc, 0x784d68ba91123086, 0xcd52880f882e7298, 0xeacf8e4e19fdcca7,
194    0xc31f385dfbd1632b, 0x1d5f27001e25abe6, 0x83130bde3c9ad991, 0xc4b225676e9b7649,
195    0xaa329b29e08eb499, 0xb67fcbd21e577d58, 0x0027baaada2acf6b, 0xe3ef2d5ac73c2226,
196    0x0890f24d6ed312b7, 0xa809e036851d7c7e, 0xf0a6fe5e0013d81b, 0x1d026304452cec14,
197    0x03864632648e248f, 0xcdaacf3dcd92b9b4, 0xf5e012e63c187856, 0x8862f9d3821c00b6,
198    0xa82f7338750f6f8a, 0x1e583dc6c1cb0b6f, 0x7a3145b69743a7f1, 0xabb20fee404807eb,
199    0xb14b3cfe07b83a5d, 0xb9dc27898adb9a0f, 0x3703f5e91baa62be, 0xcf0bb866815f7d98,
200    0x3d9867c41ea9dcd3, 0x1be1fa65442bf22c, 0x14300da4c55631d9, 0xe698e9cbc6545c99,
201    0x4763107ec64e92a5, 0xc65821fc65696a24, 0x76196c064822f0b7, 0x485be841f3525e01,
202    0xf652bc9c85974ff5, 0xcad8352face9e3e9, 0x2a6ed1dceb35e98e, 0xc6f483badc11680f,
203    0x3cfd8c17e9cf12f1, 0x89b83c5e2ea56471, 0xae665cfd24e392a9, 0xec33c4e504cb8915,
204    0x3fb9b15fc9fe7451, 0xd7fd1fd1945f2195, 0x31ade0853443efd8, 0x255efc9863e1e2d2,
205    0x10eab6008d5642cf, 0x46f04863257ac804, 0xa52dc42a789a27d3, 0xdaaadf9ce77af565,
206    0x6b479cd53d87febb, 0x6309e2d3f93db72f, 0xc5738ffbaa1ff9d6, 0x6bd57f3f25af7968,
207    0x67605486d90d0a4a, 0xe14d0b9663bfbdae, 0xb7bbd8d816eb0414, 0xdef8a4f16b35a116,
208    0xe7932d85aaaffed6, 0x08161cbae90cfd48, 0x855507beb294f08b, 0x91234ea6ffd399b2,
209    0xad70cf4b2435f302, 0xd289a97565bc2d27, 0x8e558437ffca99de, 0x96d2704b7115c040,
210    0x0889bbcdfc660e41, 0x5e0d4e67dc92128d, 0x72a9f8917063ed97, 0x438b69d409e016e3,
211    0xdf4fed8a5d8a4397, 0x00f41dcf41d403f7, 0x4814eb038e52603f, 0x9dafbacc58e2d651,
212    0xfe2f458e4be170af, 0x4457ec414df6a940, 0x06e62f1451123314, 0xbd1014d173ba92cc,
213    0xdef318e25ed57760, 0x9fea0de9dfca8525, 0x459de1e76c20624b, 0xaeec189617e2d666,
214    0x126a2c06ab5a83cb, 0xb1321532360f6132, 0x65421503dbb40123, 0x2d67c287ea089ab3,
215    0x6c93bff5a56bd6b6, 0x4ffb2036cab6d98d, 0xce7b785b1be7ad4f, 0xedb42ef6189fd163,
216    0xdc905288703988f6, 0x365f9c1d2c691884, 0xc640583680d99bfe, 0x3cd4624c07593ec6,
217    0x7f1ea8d85d7c5805, 0x014842d480b57149, 0x0b649bcb5a828688, 0xbcd5708ed79b18f0,
218    0xe987c862fbd2f2f0, 0x982731671f0cd82c, 0xbaf13e8b16d8c063, 0x8ea3109cbd951bba,
219    0xd141045bfb385cad, 0x2acbc1a0af1f7d30, 0xe6444d89df03bfdf, 0xa18cc771b8188ff9,
220    0x9834429db01c39bb, 0x214add07fe086a1f, 0x8f07c19b1f6b3ff9, 0x56a297b1bf4ffe55,
221    0x94d558e493c54fc7, 0x40bfc24c764552cb, 0x931a706f8a8520cb, 0x32229d322935bd52,
222    0x2560d0f5dc4fefaf, 0x9dbcc48355969bb6, 0x0fd81c3985c0b56a, 0xe03817e1560f2bda,
223    0xc1bb4f81d892b2d5, 0xb0c4864f4e28d2d7, 0x3ecc49f9d9d6c263, 0x51307e99b52ba65e,
224    0x8af2b688da84a752, 0xf5d72523b91b20b6, 0x6d95ff1ff4634806, 0x562f21555458339a,
225    0xc0ce47f889336346, 0x487823e5089b40d8, 0xe4727c7ebc6d9592, 0x5a8f7277e94970ba,
226    0xfca2f406b1c8bb50, 0x5b1f8a95f1791070, 0xd304af9fc9028605, 0x5440ab7fc930e748,
227    0x312d25fbca2ab5a1, 0x10f4a4b234a4d575, 0x90301d55047e7473, 0x3b6372886c61591e,
228    0x293402b77c444e06, 0x451f34a4d3e97dd7, 0x3158d814d81bc57b, 0x034942425b9bda69,
229    0xe2032ff9e532d9bb, 0x62ae066b8b2179e5, 0x9545e10c2f8d71d8, 0x7ff7483eb2d23fc0,
230    0x00945fcebdc98d86, 0x8764bbbe99b26ca2, 0x1b1ec62284c0bfc3, 0x58e0fcc4f0aa362b,
231    0x5f4abefa878d458d, 0xfd74ac2f9607c519, 0xa4e3fb37df8cbfa9, 0xbf697e43cac574e5,
232    0x86f14a3f68f4cd53, 0x24a23d076f1ce522, 0xe725cd8048868cc8, 0xbf3c729eb2464362,
233    0xd8f6cd57b3cc1ed8, 0x6329e52425541577, 0x62aa688ad5ae1ac0, 0x0a242566269bf845,
234    0x168b1a4753aca74b, 0xf789afefff2e7e3c, 0x6c3362093b6fccdb, 0x4ce8f50bd28c09b2,
235    0x006a2db95ae8aa93, 0x975b0d623c3d1a8c, 0x18605d3935338c5b, 0x5bb6f6136cad3c71,
236    0x0f53a20701f8d8a6, 0xab8c5ad2e7e93c67, 0x40b5ac5127acaa29, 0x8c7bf63c2075895f,
237    0x78bd9f7e014a805c, 0xb2c9e9f4f9c8c032, 0xefd6049827eb91f3, 0x2be459f482c16fbd,
238    0xd92ce0c5745aaa8c, 0x0aaa8fb298d965b9, 0x2b37f92c6c803b15, 0x8c54a5e94e0f0e78,
239    0x95f9b6e90c0a3032, 0xe7939faa436c7874, 0xd16bfe8f6a8a40c9, 0x44982b86263fd2fa,
240    0xe285fb39f984e583, 0x779a8df72d7619d3, 0xf2d79a8de8d5dd1e, 0xd1037354d66684e2,
241    0x004c82a4e668a8e5, 0x31d40a7668b044e6, 0xd70578538bd02c11, 0xdb45431078c5f482,
242    0x977121bb7f6a51ad, 0x73d5ccbd34eff8dd, 0xe437a07d356e17cd, 0x47b2782043c95627,
243    0x9fb251413e41d49a, 0xccd70b60652513d3, 0x1c95b31e8a1b49b2, 0xcae73dfd1bcb4c1b,
244    0x34d98331b1f5b70f, 0x784e39f22338d92f, 0x18613d4a064df420, 0xf1d8dae25f0bcebe,
245    0x33f77c15ae855efc, 0x3c88b3b912eb109c, 0x956a2ec96bafeea5, 0x1aa005b5e0ad0e87,
246    0x5500d70527c4bb8e, 0xe36c57196421cc44, 0x13c4d286cc36ee39, 0x5654a23d818b2a81,
247    0x77b1dc13d161abdc, 0x734f44de5f8d5eb5, 0x60717e174a6c89a2, 0xd47d9649266a211e,
248    0x5b13a4322bb69e90, 0xf7669609f8b5fc3c, 0x21e6ac55bedcdac9, 0x9b56b62b61166dea,
249    0xf48f66b939797e9c, 0x35f332f9c0e6ae9a, 0xcc733f6a9a878db0, 0x3da161e41cc108c2,
250    0xb7d74ae535914d51, 0x4d493b0b11d36469, 0xce264d1dfba9741a, 0xa9d1f2dc7436dc06,
251    0x70738016604c2a27, 0x231d36e96e93f3d5, 0x7666881197838d19, 0x4a2a83090aaad40c,
252    0xf1e761591668b35d, 0x7363236497f730a7, 0x301080e37379dd4d, 0x502dea2971827042,
253    0xc2c5eb858f32625f, 0x786afb9edfafbdff, 0xdaee0d868490b2a4, 0x617366b3268609f6,
254    0xae0e35a0fe46173e, 0xd1a07de93e824f11, 0x079b8b115ea4cca8, 0x93a99274558faebb,
255    0xfb1e6e22e08a03b3, 0xea635fdba3698dd0, 0xcf53659328503a5c, 0xcde3b31e6fd5d780,
256    0x8e3e4221d3614413, 0xef14d0d86bf1a22c, 0xe1d830d3f16c5ddb, 0xaabd2b2a451504e1
257];
258
259// Gear table, shifted one bit to the left, taken from https://github.com/nlfiedler/fastcdc-rs
260#[rustfmt::skip]
261const GEAR_LS: [u64; 256] = [
262    0x76ba78fa40fc6fb8, 0xf09ad1752224610c, 0x9aa5101f105ce530, 0xd59f1c9c33fb994e,
263    0x863e70bbf7a2c656, 0x3abe4e003c4b57cc, 0x062617bc7935b322, 0x89644acedd36ec92,
264    0x54653653c11d6932, 0x6cff97a43caefab0, 0x004f7555b4559ed6, 0xc7de5ab58e78444c,
265    0x1121e49adda6256e, 0x5013c06d0a3af8fc, 0xe14dfcbc0027b036, 0x3a04c6088a59d828,
266    0x070c8c64c91c491e, 0x9b559e7b9b257368, 0xebc025cc7830f0ac, 0x10c5f3a70438016c,
267    0x505ee670ea1edf14, 0x3cb07b8d839616de, 0xf4628b6d2e874fe2, 0x57641fdc80900fd6,
268    0x629679fc0f7074ba, 0x73b84f1315b7341e, 0x6e07ebd23754c57c, 0x9e1770cd02befb30,
269    0x7b30cf883d53b9a6, 0x37c3f4ca8857e458, 0x28601b498aac63b2, 0xcd31d3978ca8b932,
270    0x8ec620fd8c9d254a, 0x8cb043f8cad2d448, 0xec32d80c9045e16e, 0x90b7d083e6a4bc02,
271    0xeca579390b2e9fea, 0x95b06a5f59d3c7d2, 0x54dda3b9d66bd31c, 0x8de90775b822d01e,
272    0x79fb182fd39e25e2, 0x137078bc5d4ac8e2, 0x5cccb9fa49c72552, 0xd86789ca0997122a,
273    0x7f7362bf93fce8a2, 0xaffa3fa328be432a, 0x635bc10a6887dfb0, 0x4abdf930c7c3c5a4,
274    0x21d56c011aac859e, 0x8de090c64af59008, 0x4a5b8854f1344fa6, 0xb555bf39cef5eaca,
275    0xd68f39aa7b0ffd76, 0xc613c5a7f27b6e5e, 0x8ae71ff7543ff3ac, 0xd7aafe7e4b5ef2d0,
276    0xcec0a90db21a1494, 0xc29a172cc77f7b5c, 0x6f77b1b02dd60828, 0xbdf149e2d66b422c,
277    0xcf265b0b555ffdac, 0x102c3975d219fa90, 0x0aaa0f7d6529e116, 0x22469d4dffa73364,
278    0x5ae19e96486be604, 0xa51352eacb785a4e, 0x1cab086fff9533bc, 0x2da4e096e22b8080,
279    0x1113779bf8cc1c82, 0xbc1a9ccfb924251a, 0xe553f122e0c7db2e, 0x8716d3a813c02dc6,
280    0xbe9fdb14bb14872e, 0x01e83b9e83a807ee, 0x9029d6071ca4c07e, 0x3b5f7598b1c5aca2,
281    0xfc5e8b1c97c2e15e, 0x88afd8829bed5280, 0x0dcc5e28a2246628, 0x7a2029a2e7752598,
282    0xbde631c4bdaaeec0, 0x3fd41bd3bf950a4a, 0x8b3bc3ced840c496, 0x5dd8312c2fc5accc,
283    0x24d4580d56b50796, 0x62642a646c1ec264, 0xca842a07b7680246, 0x5acf850fd4113566,
284    0xd9277feb4ad7ad6c, 0x9ff6406d956db31a, 0x9cf6f0b637cf5a9e, 0xdb685dec313fa2c6,
285    0xb920a510e07311ec, 0x6cbf383a58d23108, 0x8c80b06d01b337fc, 0x79a8c4980eb27d8c,
286    0xfe3d51b0baf8b00a, 0x029085a9016ae292, 0x16c93796b5050d10, 0x79aae11daf3631e0,
287    0xd30f90c5f7a5e5e0, 0x304e62ce3e19b058, 0x75e27d162db180c6, 0x1d4621397b2a3774,
288    0xa28208b7f670b95a, 0x559783415e3efa60, 0xcc889b13be077fbe, 0x43198ee370311ff2,
289    0x3068853b60387376, 0x4295ba0ffc10d43e, 0x1e0f83363ed67ff2, 0xad452f637e9ffcaa,
290    0x29aab1c9278a9f8e, 0x817f8498ec8aa596, 0x2634e0df150a4196, 0x64453a64526b7aa4,
291    0x4ac1a1ebb89fdf5e, 0x3b798906ab2d376c, 0x1fb038730b816ad4, 0xc0702fc2ac1e57b4,
292    0x83769f03b12565aa, 0x61890c9e9c51a5ae, 0x7d9893f3b3ad84c6, 0xa260fd336a574cbc,
293    0x15e56d11b5094ea4, 0xebae4a477236416c, 0xdb2bfe3fe8c6900c, 0xac5e42aaa8b06734,
294    0x819c8ff11266c68c, 0x90f047ca113681b0, 0xc8e4f8fd78db2b24, 0xb51ee4efd292e174,
295    0xf945e80d639176a0, 0xb63f152be2f220e0, 0xa6095f3f92050c0a, 0xa88156ff9261ce90,
296    0x625a4bf794556b42, 0x21e949646949aaea, 0x20603aaa08fce8e6, 0x76c6e510d8c2b23c,
297    0x5268056ef8889c0c, 0x8a3e6949a7d2fbae, 0x62b1b029b0378af6, 0x06928484b737b4d2,
298    0xc4065ff3ca65b376, 0xc55c0cd71642f3ca, 0x2a8bc2185f1ae3b0, 0xffee907d65a47f80,
299    0x0128bf9d7b931b0c, 0x0ec9777d3364d944, 0x363d8c4509817f86, 0xb1c1f989e1546c56,
300    0xbe957df50f1a8b1a, 0xfae9585f2c0f8a32, 0x49c7f66fbf197f52, 0x7ed2fc87958ae9ca,
301    0x0de2947ed1e99aa6, 0x49447a0ede39ca44, 0xce4b9b00910d1990, 0x7e78e53d648c86c4,
302    0xb1ed9aaf67983db0, 0xc653ca484aa82aee, 0xc554d115ab5c3580, 0x14484acc4d37f08a,
303    0x2d16348ea7594e96, 0xef135fdffe5cfc78, 0xd866c41276df99b6, 0x99d1ea17a5181364,
304    0x00d45b72b5d15526, 0x2eb61ac4787a3518, 0x30c0ba726a6718b6, 0xb76dec26d95a78e2,
305    0x1ea7440e03f1b14c, 0x5718b5a5cfd278ce, 0x816b58a24f595452, 0x18f7ec7840eb12be,
306    0xf17b3efc029500b8, 0x6593d3e9f3918064, 0xdfac09304fd723e6, 0x57c8b3e90582df7a,
307    0xb259c18ae8b55518, 0x15551f6531b2cb72, 0x566ff258d900762a, 0x18a94bd29c1e1cf0,
308    0x2bf36dd218146064, 0xcf273f5486d8f0e8, 0xa2d7fd1ed5148192, 0x8930570c4c7fa5f4,
309    0xc50bf673f309cb06, 0xef351bee5aec33a6, 0xe5af351bd1abba3c, 0xa206e6a9accd09c4,
310    0x00990549ccd151ca, 0x63a814ecd16089cc, 0xae0af0a717a05822, 0xb68a8620f18be904,
311    0x2ee24376fed4a35a, 0xe7ab997a69dff1ba, 0xc86f40fa6adc2f9a, 0x8f64f0408792ac4e,
312    0x3f64a2827c83a934, 0x99ae16c0ca4a27a6, 0x392b663d14369364, 0x95ce7bfa37969836,
313    0x69b3066363eb6e1e, 0xf09c73e44671b25e, 0x30c27a940c9be840, 0xe3b1b5c4be179d7c,
314    0x67eef82b5d0abdf8, 0x7911677225d62138, 0x2ad45d92d75fdd4a, 0x35400b6bc15a1d0e,
315    0xaa01ae0a4f89771c, 0xc6d8ae32c8439888, 0x2789a50d986ddc72, 0xaca9447b03165502,
316    0xef63b827a2c357b8, 0xe69e89bcbf1abd6a, 0xc0e2fc2e94d91344, 0xa8fb2c924cd4423c,
317    0xb6274864576d3d20, 0xeecd2c13f16bf878, 0x43cd58ab7db9b592, 0x36ad6c56c22cdbd4,
318    0xe91ecd7272f2fd38, 0x6be665f381cd5d34, 0x98e67ed5350f1b60, 0x7b42c3c839821184,
319    0x6fae95ca6b229aa2, 0x9a92761623a6c8d2, 0x9c4c9a3bf752e834, 0x53a3e5b8e86db80c,
320    0xe0e7002cc098544e, 0x463a6dd2dd27e7aa, 0xeccd10232f071a32, 0x945506121555a818,
321    0xe3cec2b22cd166ba, 0xe6c646c92fee614e, 0x602101c6e6f3ba9a, 0xa05bd452e304e084,
322    0x858bd70b1e64c4be, 0xf0d5f73dbf5f7bfe, 0xb5dc1b0d09216548, 0xc2e6cd664d0c13ec,
323    0x5c1c6b41fc8c2e7c, 0xa340fbd27d049e22, 0x0f371622bd499950, 0x275324e8ab1f5d76,
324    0xf63cdc45c1140766, 0xd4c6bfb746d31ba0, 0x9ea6cb2650a074b8, 0x9bc7663cdfabaf00,
325    0x1c7c8443a6c28826, 0xde29a1b0d7e34458, 0xc3b061a7e2d8bbb6, 0x557a56548a2a09c2
326];
cdc_chunkers/supercdc.rs

cdc_chunkers/
supercdc.rs
