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Slice-by-16 for buf and bstr (fixes #17)

This commit is contained in:
101arrowz 2022-01-24 12:59:51 -08:00
parent 9f97346755
commit d2e236fe5e
6 changed files with 326 additions and 83 deletions
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17
bits/20_crctable.js
View File

@ -20,3 +20,20 @@ function signed_crc_table()/*:CRC32TableType*/ {
}
var T = signed_crc_table();
/*# slice by 16 tables */
function slice_by_16_tables(T) {
var c = 0, v = 0, n = 0, table/*:Array<number>*/ = typeof Int32Array !== 'undefined' ? new Int32Array(4096) : new Array(4096) ;
for(n = 0; n != 256; ++n) table[n] = T[n];
for(n = 0; n != 256; ++n) {
v = T[n];
for(c = 256 + n; c < 4096; c += 256) v = table[c] = (v >>> 8) ^ T[v & 0xFF];
}
var out = [];
for(n = 1; n != 16; ++n) out[n - 1] = typeof Int32Array !== 'undefined' ? table.subarray(n * 256, n * 256 + 256) : table.slice(n * 256, n * 256 + 256);
return out;
}
var TT = slice_by_16_tables(T);
var T1 = TT[0], T2 = TT[1], T3 = TT[2], T4 = TT[3], T5 = TT[4];
var T6 = TT[5], T7 = TT[6], T8 = TT[7], T9 = TT[8], Ta = TT[9];
var Tb = TT[10], Tc = TT[11], Td = TT[12], Te = TT[13], Tf = TT[14];

66
bits/40_crc.js
View File

@ -1,5 +1,6 @@
/*# charCodeAt is the best approach for binary strings */
function crc32_bstr(bstr/*:string*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
if(bstr.length > 10000) return crc32_bstr_16(bstr, seed);
var C = seed/*:: ? 0 : 0 */ ^ -1, L = bstr.length - 1;
for(var i = 0; i < L;) {
C = (C>>>8) ^ T[(C^bstr.charCodeAt(i++))&0xFF];
@ -8,9 +9,32 @@ function crc32_bstr(bstr/*:string*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
if(i === L) C = (C>>>8) ^ T[(C ^ bstr.charCodeAt(i))&0xFF];
return C ^ -1;
}
function crc32_bstr_16(bstr/*:string*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -1, L = bstr.length - 15;
for(var i = 0; i < L;) C =
Tf[bstr.charCodeAt(i++) ^ (C & 255)] ^
Te[bstr.charCodeAt(i++) ^ ((C >> 8) & 255)] ^
Td[bstr.charCodeAt(i++) ^ ((C >> 16) & 255)] ^
Tc[bstr.charCodeAt(i++) ^ (C >>> 24)] ^
Tb[bstr.charCodeAt(i++)] ^
Ta[bstr.charCodeAt(i++)] ^
T9[bstr.charCodeAt(i++)] ^
T8[bstr.charCodeAt(i++)] ^
T7[bstr.charCodeAt(i++)] ^
T6[bstr.charCodeAt(i++)] ^
T5[bstr.charCodeAt(i++)] ^
T4[bstr.charCodeAt(i++)] ^
T3[bstr.charCodeAt(i++)] ^
T2[bstr.charCodeAt(i++)] ^
T1[bstr.charCodeAt(i++)] ^
T[bstr.charCodeAt(i++)];
L += 15;
while(i < L) C = (C>>>8) ^ T[(C^bstr.charCodeAt(i++))&0xFF];
return C ^ -1;
}
function crc32_buf(buf/*:ABuf*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
if(buf.length > 10000) return crc32_buf_8(buf, seed);
if(buf.length > 2000) return crc32_buf_16(buf, seed);
var C = seed/*:: ? 0 : 0 */ ^ -1, L = buf.length - 3;
for(var i = 0; i < L;) {
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
@ -21,27 +45,35 @@ function crc32_buf(buf/*:ABuf*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
while(i < L+3) C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
return C ^ -1;
}
function crc32_buf_8(buf/*:ABuf*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -1, L = buf.length - 7;
for(var i = 0; i < L;) {
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
}
while(i < L+7) C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
function crc32_buf_16(buf/*:ABuf*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -1, L = buf.length - 15;
for(var i = 0; i < L;) C =
Tf[buf[i++] ^ (C & 255)] ^
Te[buf[i++] ^ ((C >> 8) & 255)] ^
Td[buf[i++] ^ ((C >> 16) & 255)] ^
Tc[buf[i++] ^ (C >>> 24)] ^
Tb[buf[i++]] ^
Ta[buf[i++]] ^
T9[buf[i++]] ^
T8[buf[i++]] ^
T7[buf[i++]] ^
T6[buf[i++]] ^
T5[buf[i++]] ^
T4[buf[i++]] ^
T3[buf[i++]] ^
T2[buf[i++]] ^
T1[buf[i++]] ^
T[buf[i++]];
L += 15;
while(i < L) C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
return C ^ -1;
}
/*# much much faster to intertwine utf8 and crc */
/*# much much faster to intertwine utf8 and crc, slower to slice by 8 or 16 */
function crc32_str(str/*:string*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -1;
for(var i = 0, L=str.length, c, d; i < L;) {
for(var i = 0, L = str.length, c = 0, d = 0; i < L;) {
c = str.charCodeAt(i++);
if(c < 0x80) {
C = (C>>>8) ^ T[(C ^ c)&0xFF];

83
crc32.flow.js
View File

@ -53,8 +53,26 @@ function signed_crc_table()/*:CRC32TableType*/ {
}
var T = signed_crc_table();
/*# slice by 16 tables */
function slice_by_16_tables(T) {
var c = 0, v = 0, n = 0, table/*:Array<number>*/ = typeof Int32Array !== 'undefined' ? new Int32Array(4096) : new Array(4096) ;
for(n = 0; n != 256; ++n) table[n] = T[n];
for(n = 0; n != 256; ++n) {
v = T[n];
for(c = 256 + n; c < 4096; c += 256) v = table[c] = (v >>> 8) ^ T[v & 0xFF];
}
var out = [];
for(n = 1; n != 16; ++n) out[n - 1] = typeof Int32Array !== 'undefined' ? table.subarray(n * 256, n * 256 + 256) : table.slice(n * 256, n * 256 + 256);
return out;
}
var TT = slice_by_16_tables(T);
var T1 = TT[0], T2 = TT[1], T3 = TT[2], T4 = TT[3], T5 = TT[4];
var T6 = TT[5], T7 = TT[6], T8 = TT[7], T9 = TT[8], Ta = TT[9];
var Tb = TT[10], Tc = TT[11], Td = TT[12], Te = TT[13], Tf = TT[14];
/*# charCodeAt is the best approach for binary strings */
function crc32_bstr(bstr/*:string*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
if(bstr.length > 10000) return crc32_bstr_16(bstr, seed);
var C = seed/*:: ? 0 : 0 */ ^ -1, L = bstr.length - 1;
for(var i = 0; i < L;) {
C = (C>>>8) ^ T[(C^bstr.charCodeAt(i++))&0xFF];
@ -63,9 +81,32 @@ function crc32_bstr(bstr/*:string*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
if(i === L) C = (C>>>8) ^ T[(C ^ bstr.charCodeAt(i))&0xFF];
return C ^ -1;
}
function crc32_bstr_16(bstr/*:string*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -1, L = bstr.length - 15;
for(var i = 0; i < L;) C =
Tf[bstr.charCodeAt(i++) ^ (C & 255)] ^
Te[bstr.charCodeAt(i++) ^ ((C >> 8) & 255)] ^
Td[bstr.charCodeAt(i++) ^ ((C >> 16) & 255)] ^
Tc[bstr.charCodeAt(i++) ^ (C >>> 24)] ^
Tb[bstr.charCodeAt(i++)] ^
Ta[bstr.charCodeAt(i++)] ^
T9[bstr.charCodeAt(i++)] ^
T8[bstr.charCodeAt(i++)] ^
T7[bstr.charCodeAt(i++)] ^
T6[bstr.charCodeAt(i++)] ^
T5[bstr.charCodeAt(i++)] ^
T4[bstr.charCodeAt(i++)] ^
T3[bstr.charCodeAt(i++)] ^
T2[bstr.charCodeAt(i++)] ^
T1[bstr.charCodeAt(i++)] ^
T[bstr.charCodeAt(i++)];
L += 15;
while(i < L) C = (C>>>8) ^ T[(C^bstr.charCodeAt(i++))&0xFF];
return C ^ -1;
}
function crc32_buf(buf/*:ABuf*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
if(buf.length > 10000) return crc32_buf_8(buf, seed);
if(buf.length > 2000) return crc32_buf_16(buf, seed);
var C = seed/*:: ? 0 : 0 */ ^ -1, L = buf.length - 3;
for(var i = 0; i < L;) {
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
@ -76,27 +117,35 @@ function crc32_buf(buf/*:ABuf*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
while(i < L+3) C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
return C ^ -1;
}
function crc32_buf_8(buf/*:ABuf*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -1, L = buf.length - 7;
for(var i = 0; i < L;) {
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
}
while(i < L+7) C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
function crc32_buf_16(buf/*:ABuf*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -1, L = buf.length - 15;
for(var i = 0; i < L;) C =
Tf[buf[i++] ^ (C & 255)] ^
Te[buf[i++] ^ ((C >> 8) & 255)] ^
Td[buf[i++] ^ ((C >> 16) & 255)] ^
Tc[buf[i++] ^ (C >>> 24)] ^
Tb[buf[i++]] ^
Ta[buf[i++]] ^
T9[buf[i++]] ^
T8[buf[i++]] ^
T7[buf[i++]] ^
T6[buf[i++]] ^
T5[buf[i++]] ^
T4[buf[i++]] ^
T3[buf[i++]] ^
T2[buf[i++]] ^
T1[buf[i++]] ^
T[buf[i++]];
L += 15;
while(i < L) C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
return C ^ -1;
}
/*# much much faster to intertwine utf8 and crc */
/*# much much faster to intertwine utf8 and crc, slower to slice by 8 or 16 */
function crc32_str(str/*:string*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -1;
for(var i = 0, L=str.length, c, d; i < L;) {
for(var i = 0, L = str.length, c = 0, d = 0; i < L;) {
c = str.charCodeAt(i++);
if(c < 0x80) {
C = (C>>>8) ^ T[(C ^ c)&0xFF];

80
crc32.js
View File

@ -46,7 +46,24 @@ function signed_crc_table() {
}
var T = signed_crc_table();
function slice_by_16_tables(T) {
var c = 0, v = 0, n = 0, table = typeof Int32Array !== 'undefined' ? new Int32Array(4096) : new Array(4096) ;
for(n = 0; n != 256; ++n) table[n] = T[n];
for(n = 0; n != 256; ++n) {
v = T[n];
for(c = 256 + n; c < 4096; c += 256) v = table[c] = (v >>> 8) ^ T[v & 0xFF];
}
var out = [];
for(n = 1; n != 16; ++n) out[n - 1] = typeof Int32Array !== 'undefined' ? table.subarray(n * 256, n * 256 + 256) : table.slice(n * 256, n * 256 + 256);
return out;
}
var TT = slice_by_16_tables(T);
var T1 = TT[0], T2 = TT[1], T3 = TT[2], T4 = TT[3], T5 = TT[4];
var T6 = TT[5], T7 = TT[6], T8 = TT[7], T9 = TT[8], Ta = TT[9];
var Tb = TT[10], Tc = TT[11], Td = TT[12], Te = TT[13], Tf = TT[14];
function crc32_bstr(bstr, seed) {
if(bstr.length > 10000) return crc32_bstr_16(bstr, seed);
var C = seed ^ -1, L = bstr.length - 1;
for(var i = 0; i < L;) {
C = (C>>>8) ^ T[(C^bstr.charCodeAt(i++))&0xFF];
@ -55,9 +72,32 @@ function crc32_bstr(bstr, seed) {
if(i === L) C = (C>>>8) ^ T[(C ^ bstr.charCodeAt(i))&0xFF];
return C ^ -1;
}
function crc32_bstr_16(bstr, seed) {
var C = seed ^ -1, L = bstr.length - 15;
for(var i = 0; i < L;) C =
Tf[bstr.charCodeAt(i++) ^ (C & 255)] ^
Te[bstr.charCodeAt(i++) ^ ((C >> 8) & 255)] ^
Td[bstr.charCodeAt(i++) ^ ((C >> 16) & 255)] ^
Tc[bstr.charCodeAt(i++) ^ (C >>> 24)] ^
Tb[bstr.charCodeAt(i++)] ^
Ta[bstr.charCodeAt(i++)] ^
T9[bstr.charCodeAt(i++)] ^
T8[bstr.charCodeAt(i++)] ^
T7[bstr.charCodeAt(i++)] ^
T6[bstr.charCodeAt(i++)] ^
T5[bstr.charCodeAt(i++)] ^
T4[bstr.charCodeAt(i++)] ^
T3[bstr.charCodeAt(i++)] ^
T2[bstr.charCodeAt(i++)] ^
T1[bstr.charCodeAt(i++)] ^
T[bstr.charCodeAt(i++)];
L += 15;
while(i < L) C = (C>>>8) ^ T[(C^bstr.charCodeAt(i++))&0xFF];
return C ^ -1;
}
function crc32_buf(buf, seed) {
if(buf.length > 10000) return crc32_buf_8(buf, seed);
if(buf.length > 2000) return crc32_buf_16(buf, seed);
var C = seed ^ -1, L = buf.length - 3;
for(var i = 0; i < L;) {
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
@ -68,26 +108,34 @@ function crc32_buf(buf, seed) {
while(i < L+3) C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
return C ^ -1;
}
function crc32_buf_8(buf, seed) {
var C = seed ^ -1, L = buf.length - 7;
for(var i = 0; i < L;) {
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
}
while(i < L+7) C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
function crc32_buf_16(buf, seed) {
var C = seed ^ -1, L = buf.length - 15;
for(var i = 0; i < L;) C =
Tf[buf[i++] ^ (C & 255)] ^
Te[buf[i++] ^ ((C >> 8) & 255)] ^
Td[buf[i++] ^ ((C >> 16) & 255)] ^
Tc[buf[i++] ^ (C >>> 24)] ^
Tb[buf[i++]] ^
Ta[buf[i++]] ^
T9[buf[i++]] ^
T8[buf[i++]] ^
T7[buf[i++]] ^
T6[buf[i++]] ^
T5[buf[i++]] ^
T4[buf[i++]] ^
T3[buf[i++]] ^
T2[buf[i++]] ^
T1[buf[i++]] ^
T[buf[i++]];
L += 15;
while(i < L) C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
return C ^ -1;
}
function crc32_str(str, seed) {
var C = seed ^ -1;
for(var i = 0, L=str.length, c, d; i < L;) {
for(var i = 0, L = str.length, c = 0, d = 0; i < L;) {
c = str.charCodeAt(i++);
if(c < 0x80) {
C = (C>>>8) ^ T[(C ^ c)&0xFF];

83
crc32c.flow.js
View File

@ -53,8 +53,26 @@ function signed_crc_table()/*:CRC32TableType*/ {
}
var T = signed_crc_table();
/*# slice by 16 tables */
function slice_by_16_tables(T) {
var c = 0, v = 0, n = 0, table/*:Array<number>*/ = typeof Int32Array !== 'undefined' ? new Int32Array(4096) : new Array(4096) ;
for(n = 0; n != 256; ++n) table[n] = T[n];
for(n = 0; n != 256; ++n) {
v = T[n];
for(c = 256 + n; c < 4096; c += 256) v = table[c] = (v >>> 8) ^ T[v & 0xFF];
}
var out = [];
for(n = 1; n != 16; ++n) out[n - 1] = typeof Int32Array !== 'undefined' ? table.subarray(n * 256, n * 256 + 256) : table.slice(n * 256, n * 256 + 256);
return out;
}
var TT = slice_by_16_tables(T);
var T1 = TT[0], T2 = TT[1], T3 = TT[2], T4 = TT[3], T5 = TT[4];
var T6 = TT[5], T7 = TT[6], T8 = TT[7], T9 = TT[8], Ta = TT[9];
var Tb = TT[10], Tc = TT[11], Td = TT[12], Te = TT[13], Tf = TT[14];
/*# charCodeAt is the best approach for binary strings */
function crc32_bstr(bstr/*:string*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
if(bstr.length > 10000) return crc32_bstr_16(bstr, seed);
var C = seed/*:: ? 0 : 0 */ ^ -1, L = bstr.length - 1;
for(var i = 0; i < L;) {
C = (C>>>8) ^ T[(C^bstr.charCodeAt(i++))&0xFF];
@ -63,9 +81,32 @@ function crc32_bstr(bstr/*:string*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
if(i === L) C = (C>>>8) ^ T[(C ^ bstr.charCodeAt(i))&0xFF];
return C ^ -1;
}
function crc32_bstr_16(bstr/*:string*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -1, L = bstr.length - 15;
for(var i = 0; i < L;) C =
Tf[bstr.charCodeAt(i++) ^ (C & 255)] ^
Te[bstr.charCodeAt(i++) ^ ((C >> 8) & 255)] ^
Td[bstr.charCodeAt(i++) ^ ((C >> 16) & 255)] ^
Tc[bstr.charCodeAt(i++) ^ (C >>> 24)] ^
Tb[bstr.charCodeAt(i++)] ^
Ta[bstr.charCodeAt(i++)] ^
T9[bstr.charCodeAt(i++)] ^
T8[bstr.charCodeAt(i++)] ^
T7[bstr.charCodeAt(i++)] ^
T6[bstr.charCodeAt(i++)] ^
T5[bstr.charCodeAt(i++)] ^
T4[bstr.charCodeAt(i++)] ^
T3[bstr.charCodeAt(i++)] ^
T2[bstr.charCodeAt(i++)] ^
T1[bstr.charCodeAt(i++)] ^
T[bstr.charCodeAt(i++)];
L += 15;
while(i < L) C = (C>>>8) ^ T[(C^bstr.charCodeAt(i++))&0xFF];
return C ^ -1;
}
function crc32_buf(buf/*:ABuf*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
if(buf.length > 10000) return crc32_buf_8(buf, seed);
if(buf.length > 2000) return crc32_buf_16(buf, seed);
var C = seed/*:: ? 0 : 0 */ ^ -1, L = buf.length - 3;
for(var i = 0; i < L;) {
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
@ -76,27 +117,35 @@ function crc32_buf(buf/*:ABuf*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
while(i < L+3) C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
return C ^ -1;
}
function crc32_buf_8(buf/*:ABuf*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -1, L = buf.length - 7;
for(var i = 0; i < L;) {
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
}
while(i < L+7) C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
function crc32_buf_16(buf/*:ABuf*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -1, L = buf.length - 15;
for(var i = 0; i < L;) C =
Tf[buf[i++] ^ (C & 255)] ^
Te[buf[i++] ^ ((C >> 8) & 255)] ^
Td[buf[i++] ^ ((C >> 16) & 255)] ^
Tc[buf[i++] ^ (C >>> 24)] ^
Tb[buf[i++]] ^
Ta[buf[i++]] ^
T9[buf[i++]] ^
T8[buf[i++]] ^
T7[buf[i++]] ^
T6[buf[i++]] ^
T5[buf[i++]] ^
T4[buf[i++]] ^
T3[buf[i++]] ^
T2[buf[i++]] ^
T1[buf[i++]] ^
T[buf[i++]];
L += 15;
while(i < L) C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
return C ^ -1;
}
/*# much much faster to intertwine utf8 and crc */
/*# much much faster to intertwine utf8 and crc, slower to slice by 8 or 16 */
function crc32_str(str/*:string*/, seed/*:?CRC32Type*/)/*:CRC32Type*/ {
var C = seed/*:: ? 0 : 0 */ ^ -1;
for(var i = 0, L=str.length, c, d; i < L;) {
for(var i = 0, L = str.length, c = 0, d = 0; i < L;) {
c = str.charCodeAt(i++);
if(c < 0x80) {
C = (C>>>8) ^ T[(C ^ c)&0xFF];

80
crc32c.js
View File

@ -46,7 +46,24 @@ function signed_crc_table() {
}
var T = signed_crc_table();
function slice_by_16_tables(T) {
var c = 0, v = 0, n = 0, table = typeof Int32Array !== 'undefined' ? new Int32Array(4096) : new Array(4096) ;
for(n = 0; n != 256; ++n) table[n] = T[n];
for(n = 0; n != 256; ++n) {
v = T[n];
for(c = 256 + n; c < 4096; c += 256) v = table[c] = (v >>> 8) ^ T[v & 0xFF];
}
var out = [];
for(n = 1; n != 16; ++n) out[n - 1] = typeof Int32Array !== 'undefined' ? table.subarray(n * 256, n * 256 + 256) : table.slice(n * 256, n * 256 + 256);
return out;
}
var TT = slice_by_16_tables(T);
var T1 = TT[0], T2 = TT[1], T3 = TT[2], T4 = TT[3], T5 = TT[4];
var T6 = TT[5], T7 = TT[6], T8 = TT[7], T9 = TT[8], Ta = TT[9];
var Tb = TT[10], Tc = TT[11], Td = TT[12], Te = TT[13], Tf = TT[14];
function crc32_bstr(bstr, seed) {
if(bstr.length > 10000) return crc32_bstr_16(bstr, seed);
var C = seed ^ -1, L = bstr.length - 1;
for(var i = 0; i < L;) {
C = (C>>>8) ^ T[(C^bstr.charCodeAt(i++))&0xFF];
@ -55,9 +72,32 @@ function crc32_bstr(bstr, seed) {
if(i === L) C = (C>>>8) ^ T[(C ^ bstr.charCodeAt(i))&0xFF];
return C ^ -1;
}
function crc32_bstr_16(bstr, seed) {
var C = seed ^ -1, L = bstr.length - 15;
for(var i = 0; i < L;) C =
Tf[bstr.charCodeAt(i++) ^ (C & 255)] ^
Te[bstr.charCodeAt(i++) ^ ((C >> 8) & 255)] ^
Td[bstr.charCodeAt(i++) ^ ((C >> 16) & 255)] ^
Tc[bstr.charCodeAt(i++) ^ (C >>> 24)] ^
Tb[bstr.charCodeAt(i++)] ^
Ta[bstr.charCodeAt(i++)] ^
T9[bstr.charCodeAt(i++)] ^
T8[bstr.charCodeAt(i++)] ^
T7[bstr.charCodeAt(i++)] ^
T6[bstr.charCodeAt(i++)] ^
T5[bstr.charCodeAt(i++)] ^
T4[bstr.charCodeAt(i++)] ^
T3[bstr.charCodeAt(i++)] ^
T2[bstr.charCodeAt(i++)] ^
T1[bstr.charCodeAt(i++)] ^
T[bstr.charCodeAt(i++)];
L += 15;
while(i < L) C = (C>>>8) ^ T[(C^bstr.charCodeAt(i++))&0xFF];
return C ^ -1;
}
function crc32_buf(buf, seed) {
if(buf.length > 10000) return crc32_buf_8(buf, seed);
if(buf.length > 2000) return crc32_buf_16(buf, seed);
var C = seed ^ -1, L = buf.length - 3;
for(var i = 0; i < L;) {
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
@ -68,26 +108,34 @@ function crc32_buf(buf, seed) {
while(i < L+3) C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
return C ^ -1;
}
function crc32_buf_8(buf, seed) {
var C = seed ^ -1, L = buf.length - 7;
for(var i = 0; i < L;) {
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
}
while(i < L+7) C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
function crc32_buf_16(buf, seed) {
var C = seed ^ -1, L = buf.length - 15;
for(var i = 0; i < L;) C =
Tf[buf[i++] ^ (C & 255)] ^
Te[buf[i++] ^ ((C >> 8) & 255)] ^
Td[buf[i++] ^ ((C >> 16) & 255)] ^
Tc[buf[i++] ^ (C >>> 24)] ^
Tb[buf[i++]] ^
Ta[buf[i++]] ^
T9[buf[i++]] ^
T8[buf[i++]] ^
T7[buf[i++]] ^
T6[buf[i++]] ^
T5[buf[i++]] ^
T4[buf[i++]] ^
T3[buf[i++]] ^
T2[buf[i++]] ^
T1[buf[i++]] ^
T[buf[i++]];
L += 15;
while(i < L) C = (C>>>8) ^ T[(C^buf[i++])&0xFF];
return C ^ -1;
}
function crc32_str(str, seed) {
var C = seed ^ -1;
for(var i = 0, L=str.length, c, d; i < L;) {
for(var i = 0, L = str.length, c = 0, d = 0; i < L;) {
c = str.charCodeAt(i++);
if(c < 0x80) {
C = (C>>>8) ^ T[(C ^ c)&0xFF];