Beanz/pdf.js
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Simplify various calculate... methods a tiny bit

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While initializing the `padded` Uint8Arrays we're manually assigning zeros to some entries, which is completely unnecessary since that's the default value for a TypedArray, and instead we can just increment the index.
This commit is contained in:
Jonas Jenwald 2025-03-08 15:56:29 +01:00
parent facf34606f
commit 139d27aa7d
3 changed files with 9 additions and 23 deletions
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8
src/core/calculate_md5.js
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@ -64,17 +64,15 @@ function calculateMD5(data, offset, length) {
} }
padded[i++] = 0x80; padded[i++] = 0x80;
const n = paddedLength - 8; const n = paddedLength - 8;
while (i < n) { if (i < n) {
padded[i++] = 0; i = n;
} }
padded[i++] = (length << 3) & 0xff; padded[i++] = (length << 3) & 0xff;
padded[i++] = (length >> 5) & 0xff; padded[i++] = (length >> 5) & 0xff;
padded[i++] = (length >> 13) & 0xff; padded[i++] = (length >> 13) & 0xff;
padded[i++] = (length >> 21) & 0xff; padded[i++] = (length >> 21) & 0xff;
padded[i++] = (length >>> 29) & 0xff; padded[i++] = (length >>> 29) & 0xff;
padded[i++] = 0; i += 3;
padded[i++] = 0;
padded[i++] = 0;
const w = new Int32Array(16); const w = new Int32Array(16);
const { k, r } = PARAMS; const { k, r } = PARAMS;
for (i = 0; i < paddedLength; ) { for (i = 0; i < paddedLength; ) {

8
src/core/calculate_sha256.js
View File

@ -84,12 +84,10 @@ function calculateSHA256(data, offset, length) {
} }
padded[i++] = 0x80; padded[i++] = 0x80;
const n = paddedLength - 8; const n = paddedLength - 8;
while (i < n) { if (i < n) {
padded[i++] = 0; i = n;
} }
padded[i++] = 0; i += 3;
padded[i++] = 0;
padded[i++] = 0;
padded[i++] = (length >>> 29) & 0xff; padded[i++] = (length >>> 29) & 0xff;
padded[i++] = (length >> 21) & 0xff; padded[i++] = (length >> 21) & 0xff;
padded[i++] = (length >> 13) & 0xff; padded[i++] = (length >> 13) & 0xff;

16
src/core/calculate_sha_other.js
View File

@ -287,20 +287,10 @@ function calculateSHA512(data, offset, length, mode384 = false) {
} }
padded[i++] = 0x80; padded[i++] = 0x80;
const n = paddedLength - 16; const n = paddedLength - 16;
while (i < n) { if (i < n) {
padded[i++] = 0; i = n;
} }
padded[i++] = 0; i += 11;
padded[i++] = 0;
padded[i++] = 0;
padded[i++] = 0;
padded[i++] = 0;
padded[i++] = 0;
padded[i++] = 0;
padded[i++] = 0;
padded[i++] = 0;
padded[i++] = 0;
padded[i++] = 0;
padded[i++] = (length >>> 29) & 0xff; padded[i++] = (length >>> 29) & 0xff;
padded[i++] = (length >> 21) & 0xff; padded[i++] = (length >> 21) & 0xff;
padded[i++] = (length >> 13) & 0xff; padded[i++] = (length >> 13) & 0xff;