ref: 8418b4ced569104595f343e6f762a3ab60db2c3a
author: grobe0ba <grobe0ba@tcp80.org>
date: Sat Aug 13 11:17:37 CDT 2022
initial commit
--- /dev/null
+++ b/README.md
@@ -1,0 +1,5 @@
+# crc32 for hare
+Calculate crc32 hash for a buffer.
+
+## cmd/tblgen
+Regenerate the crc table for a polynomial of your choice
--- /dev/null
+++ b/cmd/tblgen/crctbl.ha
@@ -1,0 +1,86 @@
+// Copyright (c) 2022 grobe0ba (grobe0ba@tcp80.org)
+//
+// Permission to use, copy, modify, and distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+// A method for generating the polynomial (taken from zlib):
+// x^26+x^23+x^22+x^16+x^12+X^11+x^10+x^8+x^7+x^5+x^4+x^2+x+1
+// static const unsigned char p[] = { 0, 1, 2, 4, 5, 7, 8, 10, 11,+// 12, 16, 22, 23, 26 };
+//
+// The CRC16 polynomial used in github.com/google/ahdlc:
+// x^16 + x^15 + x^2 + 1
+// static const unsigned char p[] = { 0, 2, 15 };+//
+// uint32_t poly = 0;
+// uint16_t lower = 0;
+// uint16_t upper = 0;
+//
+// for (uint32_t i = 0; i < sizeof(p) / sizeof(unsigned char); ++i) {+// poly |= 1UL << (15 - p[i]);
+// }
+//
+// lower = poly & ((1U << 16) - 1);
+// upper = poly >> 16;
+// poly = (lower << 16) | upper;
+
+use fmt;
+
+export fn main() void = {+// let poly: u32 = 0;
+// let lower: u32 = 0;
+// let upper: u32 = 0;
+//
+// const p: []u32 = [ 0, 1, 2, 4, 5, 7, 8, 10, 11, 12, 16, 22, 23, 26 ];
+//
+// for (let i = 0z; i < len(p); i += 1) {+// poly |= (1: u32) << (15 - p[i]);
+// };
+//
+// lower = poly & ((1 << 16) - 1);
+// upper = poly >> 16;
+// poly = (lower << 16) | upper;
+//
+// assert(poly == 0xedb88320);
+
+ const poly: u32 = 0xedb88320;
+
+ let t: [256]u32 = [0...];
+
+ for (let i = 0z; i < len(t); i += 1) {+ let crc = i;
+ for (let j = 0z; j < 8; j += 1) {+ if ((crc & 1) == 1) {+ crc = (crc >> 1) ^ poly;
+ } else {+ crc >>= 1;
+ };
+ };
+ t[i] = (crc: u32);
+ };
+
+ fmt::printf("// This file is generated using cmd/tblgen. DO NOT EDIT.\n\n")!;+ fmt::printf("const crc32_tab: []u32 = [\n ")!;+
+ let col = 0;
+
+ for (let i = 0z; i < len(t); i += 1) {+ if ((col + 12) >= 76) {+ fmt::printf("\n ")!;+ col = 0;
+ };
+ fmt::printf(" 0x{:08x},", t[i])!;+ col += 12;
+ };
+
+ fmt::printf("\n];\n")!;+};
--- /dev/null
+++ b/crc.ha
@@ -1,0 +1,36 @@
+// Copyright (c) 2022 grobe0ba (grobe0ba@tcp80.org)
+//
+// Permission to use, copy, modify, and distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+use strings;
+
+export fn crc32(crc: u32, inbuf: []u8) u32 = {+ crc = crc ^ ~0;
+
+ for (let i = 0z; i < len(inbuf); i += 1) {+ crc = crc32_tab[(crc ^ inbuf[i]) & 0xff] ^ (crc >> 8);
+ };
+
+ return crc ^ ~0;
+};
+
+@test fn crc32() void = {+ const ts: str = "harelang";
+ const tc: *char = strings::to_c(ts);
+ defer free(tc);
+ const ta = (tc: *[*]u8)[..len(ts)];
+
+ const sum: u32 = crc32(0, ta);
+
+ assert(sum == 0x4c982cbf);
+};
--- /dev/null
+++ b/crctbl.ha
@@ -1,0 +1,47 @@
+// This file is generated using cmd/tblgen. DO NOT EDIT.
+
+const crc32_tab: []u32 = [
+ 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
+ 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
+ 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
+ 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+ 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
+ 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
+ 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
+ 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+ 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
+ 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+ 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
+ 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+ 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
+ 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
+ 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
+ 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+ 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
+ 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
+ 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
+ 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+ 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
+ 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
+ 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
+ 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+ 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
+ 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
+ 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
+ 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+ 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
+ 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+ 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
+ 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+ 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
+ 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
+ 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
+ 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+ 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
+ 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
+ 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
+ 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+ 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
+ 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
+ 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
+];