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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 05:50:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 05:50:18 +0000 |
commit | 55a5d29a66503248916f249ad2a1d8b37cde5a03 (patch) | |
tree | a3beb6a90dd3bdaaf67ecb05d42152a494aff946 /src/js/base64-custom.js | |
parent | Adding upstream version 1.55.0+dfsg. (diff) | |
download | ublock-origin-upstream/1.57.0+dfsg.tar.xz ublock-origin-upstream/1.57.0+dfsg.zip |
Adding upstream version 1.57.0+dfsg.upstream/1.57.0+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/js/base64-custom.js')
-rw-r--r-- | src/js/base64-custom.js | 103 |
1 files changed, 1 insertions, 102 deletions
diff --git a/src/js/base64-custom.js b/src/js/base64-custom.js index 34141b8..0d9a43f 100644 --- a/src/js/base64-custom.js +++ b/src/js/base64-custom.js @@ -46,105 +46,6 @@ const digitToVal = new Uint8Array(128); } } -// The sparse base64 codec is best for buffers which contains a lot of -// small u32 integer values. Those small u32 integer values are better -// represented with stringified integers, because small values can be -// represented with fewer bits than the usual base64 codec. For example, -// 0 become '0 ', i.e. 16 bits instead of 48 bits with official base64 -// codec. - -const sparseBase64 = { - magic: 'Base64_1', - - encode: function(arrbuf, arrlen) { - const inputLength = (arrlen + 3) >>> 2; - const inbuf = new Uint32Array(arrbuf, 0, inputLength); - const outputLength = this.magic.length + 7 + inputLength * 7; - const outbuf = new Uint8Array(outputLength); - // magic bytes - let j = 0; - for ( let i = 0; i < this.magic.length; i++ ) { - outbuf[j++] = this.magic.charCodeAt(i); - } - // array size - let v = inputLength; - do { - outbuf[j++] = valToDigit[v & 0b111111]; - v >>>= 6; - } while ( v !== 0 ); - outbuf[j++] = 0x20 /* ' ' */; - // array content - for ( let i = 0; i < inputLength; i++ ) { - v = inbuf[i]; - do { - outbuf[j++] = valToDigit[v & 0b111111]; - v >>>= 6; - } while ( v !== 0 ); - outbuf[j++] = 0x20 /* ' ' */; - } - if ( typeof TextDecoder === 'undefined' ) { - return JSON.stringify( - Array.from(new Uint32Array(outbuf.buffer, 0, j >>> 2)) - ); - } - const textDecoder = new TextDecoder(); - return textDecoder.decode(new Uint8Array(outbuf.buffer, 0, j)); - }, - - decode: function(instr, arrbuf) { - if ( instr.charCodeAt(0) === 0x5B /* '[' */ ) { - const inbuf = JSON.parse(instr); - if ( arrbuf instanceof ArrayBuffer === false ) { - return new Uint32Array(inbuf); - } - const outbuf = new Uint32Array(arrbuf); - outbuf.set(inbuf); - return outbuf; - } - if ( instr.startsWith(this.magic) === false ) { - throw new Error('Invalid µBlock.base64 encoding'); - } - const inputLength = instr.length; - const outputLength = this.decodeSize(instr) >> 2; - const outbuf = arrbuf instanceof ArrayBuffer === false - ? new Uint32Array(outputLength) - : new Uint32Array(arrbuf); - let i = instr.indexOf(' ', this.magic.length) + 1; - if ( i === -1 ) { - throw new Error('Invalid µBlock.base64 encoding'); - } - // array content - let j = 0; - for (;;) { - if ( j === outputLength || i >= inputLength ) { break; } - let v = 0, l = 0; - for (;;) { - const c = instr.charCodeAt(i++); - if ( c === 0x20 /* ' ' */ ) { break; } - v += digitToVal[c] << l; - l += 6; - } - outbuf[j++] = v; - } - if ( i < inputLength || j < outputLength ) { - throw new Error('Invalid µBlock.base64 encoding'); - } - return outbuf; - }, - - decodeSize: function(instr) { - if ( instr.startsWith(this.magic) === false ) { return 0; } - let v = 0, l = 0, i = this.magic.length; - for (;;) { - const c = instr.charCodeAt(i++); - if ( c === 0x20 /* ' ' */ ) { break; } - v += digitToVal[c] << l; - l += 6; - } - return v << 2; - }, -}; - // The dense base64 codec is best for typed buffers which values are // more random. For example, buffer contents as a result of compression // contain less repetitive values and thus the content is more @@ -154,7 +55,7 @@ const sparseBase64 = { // ArrayBuffer fails, the content of the resulting Uint8Array is // non-sensical. WASM-related? -const denseBase64 = { +export const denseBase64 = { magic: 'DenseBase64_1', encode: function(input) { @@ -242,5 +143,3 @@ const denseBase64 = { }; /******************************************************************************/ - -export { denseBase64, sparseBase64 }; |