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Improve usage of file_id

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This commit is contained in:
gingerBill
2021-11-15 17:26:01 +00:00
parent f55fc4cd08
commit e814a3693f
9 changed files with 75 additions and 30 deletions
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63
src/common.cpp
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@@ -83,9 +83,20 @@ int i32_cmp(i32 x, i32 y) {
u32 fnv32a(void const *data, isize len) {
u8 const *bytes = cast(u8 const *)data;
u32 h = 0x811c9dc5;
for (isize i = 0; i < len; i++) {
u32 b = cast(u32)bytes[i];
h = (h ^ b) * 0x01000193;
for (; len >= 8; len -= 8, bytes += 8) {
h = (h ^ bytes[0]) * 0x01000193;
h = (h ^ bytes[1]) * 0x01000193;
h = (h ^ bytes[2]) * 0x01000193;
h = (h ^ bytes[3]) * 0x01000193;
h = (h ^ bytes[4]) * 0x01000193;
h = (h ^ bytes[5]) * 0x01000193;
h = (h ^ bytes[6]) * 0x01000193;
h = (h ^ bytes[7]) * 0x01000193;
}
while (len--) {
h = (h ^ *bytes++) * 0x01000193;
}
return h;
}
@@ -93,20 +104,48 @@ u32 fnv32a(void const *data, isize len) {
u64 fnv64a(void const *data, isize len) {
u8 const *bytes = cast(u8 const *)data;
u64 h = 0xcbf29ce484222325ull;
for (isize i = 0; i < len; i++) {
u64 b = cast(u64)bytes[i];
h = (h ^ b) * 0x100000001b3ull;
for (; len >= 8; len -= 8, bytes += 8) {
h = (h ^ bytes[0]) * 0x100000001b3ull;
h = (h ^ bytes[1]) * 0x100000001b3ull;
h = (h ^ bytes[2]) * 0x100000001b3ull;
h = (h ^ bytes[3]) * 0x100000001b3ull;
h = (h ^ bytes[4]) * 0x100000001b3ull;
h = (h ^ bytes[5]) * 0x100000001b3ull;
h = (h ^ bytes[6]) * 0x100000001b3ull;
h = (h ^ bytes[7]) * 0x100000001b3ull;
}
while (len--) {
h = (h ^ *bytes++) * 0x100000001b3ull;
}
return h;
}
u64 u64_digit_value(Rune r) {
if ('0' <= r && r <= '9') {
return r - '0';
} else if ('a' <= r && r <= 'f') {
return r - 'a' + 10;
} else if ('A' <= r && r <= 'F') {
return r - 'A' + 10;
switch (r) {
case '0': return 0;
case '1': return 1;
case '2': return 2;
case '3': return 3;
case '4': return 4;
case '5': return 5;
case '6': return 6;
case '7': return 7;
case '8': return 8;
case '9': return 9;
case 'a': return 10;
case 'b': return 11;
case 'c': return 12;
case 'd': return 13;
case 'e': return 14;
case 'f': return 15;
case 'A': return 10;
case 'B': return 11;
case 'C': return 12;
case 'D': return 13;
case 'E': return 14;
case 'F': return 15;
}
return 16; // NOTE(bill): Larger than highest possible
}