encode small amounts

This commit is contained in:
Cyryl Płotnicki 2021-05-16 10:37:23 +01:00
parent 657428ee4d
commit 6ba7045301
3 changed files with 677 additions and 28 deletions

629
Cargo.lock generated
View file

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checksum = "bc881b2c22681370c6a780e47af9840ef841837bc98118431d4e1868bd0c1086"
[[package]]
name = "proc-macro2"
version = "1.0.24"
@ -792,17 +1273,92 @@ dependencies = [
"serde",
]
[[package]]
name = "sha-1"
version = "0.8.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f7d94d0bede923b3cea61f3f1ff57ff8cdfd77b400fb8f9998949e0cf04163df"
dependencies = [
"block-buffer 0.7.3",
"digest 0.8.1",
"fake-simd",
"opaque-debug 0.2.3",
]
[[package]]
name = "sha2"
version = "0.8.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a256f46ea78a0c0d9ff00077504903ac881a1dafdc20da66545699e7776b3e69"
dependencies = [
"block-buffer 0.7.3",
"digest 0.8.1",
"fake-simd",
"opaque-debug 0.2.3",
]
[[package]]
name = "sha2"
version = "0.9.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "fa827a14b29ab7f44778d14a88d3cb76e949c45083f7dbfa507d0cb699dc12de"
dependencies = [
"block-buffer",
"block-buffer 0.9.0",
"cfg-if 1.0.0",
"cpuid-bool",
"digest",
"opaque-debug",
"digest 0.9.0",
"opaque-debug 0.3.0",
]
[[package]]
name = "signal-hook"
version = "0.3.8"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ef33d6d0cd06e0840fba9985aab098c147e67e05cee14d412d3345ed14ff30ac"
dependencies = [
"libc",
"signal-hook-registry",
]
[[package]]
name = "signal-hook-registry"
version = "1.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "16f1d0fef1604ba8f7a073c7e701f213e056707210e9020af4528e0101ce11a6"
dependencies = [
"libc",
]
[[package]]
name = "slab"
version = "0.4.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f173ac3d1a7e3b28003f40de0b5ce7fe2710f9b9dc3fc38664cebee46b3b6527"
[[package]]
name = "socket2"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9e3dfc207c526015c632472a77be09cf1b6e46866581aecae5cc38fb4235dea2"
dependencies = [
"libc",
"winapi",
]
[[package]]
name = "ssri"
version = "5.0.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e875e58f12c33f832d09cff94b079aee84a48d8188d7a7132b3434358afb70c9"
dependencies = [
"base64 0.10.1",
"digest 0.8.1",
"hex 0.3.2",
"serde",
"serde_derive",
"sha-1",
"sha2 0.8.2",
"thiserror",
]
[[package]]
@ -942,6 +1498,12 @@ dependencies = [
"libc",
]
[[package]]
name = "waker-fn"
version = "1.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9d5b2c62b4012a3e1eca5a7e077d13b3bf498c4073e33ccd58626607748ceeca"
[[package]]
name = "walkdir"
version = "2.3.1"
@ -967,9 +1529,9 @@ checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
[[package]]
name = "wasm-bindgen"
version = "0.2.70"
version = "0.2.72"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "55c0f7123de74f0dab9b7d00fd614e7b19349cd1e2f5252bbe9b1754b59433be"
checksum = "8fe8f61dba8e5d645a4d8132dc7a0a66861ed5e1045d2c0ed940fab33bac0fbe"
dependencies = [
"cfg-if 1.0.0",
"serde",
@ -979,9 +1541,9 @@ dependencies = [
[[package]]
name = "wasm-bindgen-backend"
version = "0.2.70"
version = "0.2.72"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7bc45447f0d4573f3d65720f636bbcc3dd6ce920ed704670118650bcd47764c7"
checksum = "046ceba58ff062da072c7cb4ba5b22a37f00a302483f7e2a6cdc18fedbdc1fd3"
dependencies = [
"bumpalo",
"lazy_static",
@ -993,10 +1555,22 @@ dependencies = [
]
[[package]]
name = "wasm-bindgen-macro"
version = "0.2.70"
name = "wasm-bindgen-futures"
version = "0.4.22"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3b8853882eef39593ad4174dd26fc9865a64e84026d223f63bb2c42affcbba2c"
checksum = "73157efb9af26fb564bb59a009afd1c7c334a44db171d280690d0c3faaec3468"
dependencies = [
"cfg-if 1.0.0",
"js-sys",
"wasm-bindgen",
"web-sys",
]
[[package]]
name = "wasm-bindgen-macro"
version = "0.2.72"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0ef9aa01d36cda046f797c57959ff5f3c615c9cc63997a8d545831ec7976819b"
dependencies = [
"quote",
"wasm-bindgen-macro-support",
@ -1004,9 +1578,9 @@ dependencies = [
[[package]]
name = "wasm-bindgen-macro-support"
version = "0.2.70"
version = "0.2.72"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "4133b5e7f2a531fa413b3a1695e925038a05a71cf67e87dafa295cb645a01385"
checksum = "96eb45c1b2ee33545a813a92dbb53856418bf7eb54ab34f7f7ff1448a5b3735d"
dependencies = [
"proc-macro2",
"quote",
@ -1017,9 +1591,9 @@ dependencies = [
[[package]]
name = "wasm-bindgen-shared"
version = "0.2.70"
version = "0.2.72"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "dd4945e4943ae02d15c13962b38a5b1e81eadd4b71214eee75af64a4d6a4fd64"
checksum = "b7148f4696fb4960a346eaa60bbfb42a1ac4ebba21f750f75fc1375b098d5ffa"
[[package]]
name = "web-sys"
@ -1031,6 +1605,15 @@ dependencies = [
"wasm-bindgen",
]
[[package]]
name = "wepoll-sys"
version = "3.0.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0fcb14dea929042224824779fbc82d9fab8d2e6d3cbc0ac404de8edf489e77ff"
dependencies = [
"cc",
]
[[package]]
name = "winapi"
version = "0.3.9"

View file

@ -7,6 +7,7 @@ license = "AGPL-3.0"
description = "modern and simple, yet efficient backup solution"
[dependencies]
cacache = "8"
anyhow = "1.0"
atomicwrites = "0.2"
base64 = "0.13"

View file

@ -1,11 +1,54 @@
use anyhow::*;
use std::io::Read;
use anyhow::*;
use reed_solomon::Encoder;
use reed_solomon::{Buffer, Decoder};
const BLOCK_SIZE: usize = 256;
const ECC_LENGTH: usize = 8;
// TODO: make the API streaming friendly
pub fn encode(bytes: &[u8]) -> Result<Vec<u8>> {
Ok(Vec::from(bytes))
let encoder = Encoder::new(ECC_LENGTH);
let encoded_blocks = bytes
.chunks(BLOCK_SIZE)
.map(|chunk| encoder.encode(chunk))
.collect::<Vec<Buffer>>();
let mut result = vec![];
dbg!(encoded_blocks.len());
for buffer in encoded_blocks {
dbg!(buffer.bytes().count());
for byte in buffer.bytes() {
result.push(byte?);
}
}
dbg!(result.len());
Ok(result)
}
pub fn decode(bytes: &[u8]) -> Result<Vec<u8>> {
Ok(Vec::from(bytes))
let decoder = Decoder::new(ECC_LENGTH);
let decoded_blocks = bytes
.chunks(BLOCK_SIZE + ECC_LENGTH)
.map(|chunk| decoder.correct(chunk, None).map_err(|e| anyhow!(format!("{:#?}", e))))
.collect::<Result<Vec<Buffer>>>()?;
let mut result = vec![];
dbg!(decoded_blocks.len());
for buffer in decoded_blocks {
dbg!(buffer.bytes().count());
for byte in buffer.data() {
result.push(byte.clone());
}
}
dbg!(result.len());
Ok(result)
}
#[cfg(test)]
@ -19,7 +62,29 @@ mod must {
use pretty_assertions::assert_eq;
#[test]
#[ignore = "wip"]
fn encode_small_amounts_of_data() -> Result<()> {
let mut original: [u8; 32] = [0; 32];
thread_rng().fill_bytes(&mut original);
let decoded = decode(&encode(&original)?)?;
assert_eq!(decoded, original);
Ok(())
}
#[test]
fn encode_large_amounts_of_data() -> Result<()> {
let mut original: [u8; 1024 * 1024] = [0; 1024 * 1024];
thread_rng().fill_bytes(&mut original);
let decoded = decode(&encode(&original)?)?;
assert_eq!(decoded, original);
Ok(())
}
#[test]
fn survive_data_corruption() -> Result<()> {
let mut original: [u8; 32] = [0; 32];
thread_rng().fill_bytes(&mut original);
@ -32,7 +97,7 @@ mod must {
let mut corrupted = Vec::from(encoded);
corrupted[corrupt_byte_index] = rand::thread_rng().gen::<u8>();
let decoded = decode(&corrupted).unwrap();
let decoded = decode(&corrupted)?;
assert_eq!(decoded, original);