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Merge pull request #879 from Kelimion/partial_hash_updates

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Allow seeding CRC32, CRC64 & Adler32 with previous partial hash.
This commit is contained in:
gingerBill
2021-03-30 11:20:19 +01:00
committed by GitHub
parent 439e2c9242 f4d0f74dbb
commit 2c14accfd0
2 changed files with 6 additions and 6 deletions
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8
core/hash/crc.odin
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@@ -1,14 +1,14 @@
package hash
crc32 :: proc(data: []byte) -> u32 #no_bounds_check {
result := ~u32(0);
crc32 :: proc(data: []byte, seed := u32(0)) -> u32 #no_bounds_check {
result := ~u32(seed);
for b in data {
result = result>>8 ~ _crc32_table[(result ~ u32(b)) & 0xff];
}
return ~result;
}
crc64 :: proc(data: []byte) -> u64 #no_bounds_check {
result := ~u64(0);
crc64 :: proc(data: []byte, seed := u32(0)) -> u64 #no_bounds_check {
result := ~u64(seed);
for b in data {
result = result>>8 ~ _crc64_table[(result ~ u64(b)) & 0xff];
}

4
core/hash/hash.odin
View File

@@ -2,9 +2,9 @@ package hash
import "core:mem"
adler32 :: proc(data: []byte) -> u32 {
adler32 :: proc(data: []byte, seed := u32(1)) -> u32 {
ADLER_CONST :: 65521;
a, b: u32 = 1, 0;
a, b: u32 = seed & 0xFFFF, seed >> 16;
for x in data {
a = (a + u32(x)) % ADLER_CONST;
b = (b + a) % ADLER_CONST;