aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/node_modules/@fastify/busboy/deps/streamsearch
diff options
context:
space:
mode:
authorEgor Tensin <egor@tensin.name>2024-01-28 11:18:12 +0100
committerEgor Tensin <egor@tensin.name>2024-01-28 11:18:12 +0100
commit2d40e8046a08373b1740922690b695a16d5e5fa6 (patch)
treeeb086741d1bb01ef9ed3d0ac8e1301447e835971 /node_modules/@fastify/busboy/deps/streamsearch
parentworkflows/test: upgrade actions (diff)
downloadcleanup-path-2d40e8046a08373b1740922690b695a16d5e5fa6.tar.gz
cleanup-path-2d40e8046a08373b1740922690b695a16d5e5fa6.zip
bump version in package.json, upgrade dependencies
Diffstat (limited to '')
-rw-r--r--node_modules/@fastify/busboy/deps/streamsearch/sbmh.js228
1 files changed, 228 insertions, 0 deletions
diff --git a/node_modules/@fastify/busboy/deps/streamsearch/sbmh.js b/node_modules/@fastify/busboy/deps/streamsearch/sbmh.js
new file mode 100644
index 0000000..b90c0e8
--- /dev/null
+++ b/node_modules/@fastify/busboy/deps/streamsearch/sbmh.js
@@ -0,0 +1,228 @@
+'use strict'
+
+/**
+ * Copyright Brian White. All rights reserved.
+ *
+ * @see https://github.com/mscdex/streamsearch
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Based heavily on the Streaming Boyer-Moore-Horspool C++ implementation
+ * by Hongli Lai at: https://github.com/FooBarWidget/boyer-moore-horspool
+ */
+const EventEmitter = require('node:events').EventEmitter
+const inherits = require('node:util').inherits
+
+function SBMH (needle) {
+ if (typeof needle === 'string') {
+ needle = Buffer.from(needle)
+ }
+
+ if (!Buffer.isBuffer(needle)) {
+ throw new TypeError('The needle has to be a String or a Buffer.')
+ }
+
+ const needleLength = needle.length
+
+ if (needleLength === 0) {
+ throw new Error('The needle cannot be an empty String/Buffer.')
+ }
+
+ if (needleLength > 256) {
+ throw new Error('The needle cannot have a length bigger than 256.')
+ }
+
+ this.maxMatches = Infinity
+ this.matches = 0
+
+ this._occ = new Array(256)
+ .fill(needleLength) // Initialize occurrence table.
+ this._lookbehind_size = 0
+ this._needle = needle
+ this._bufpos = 0
+
+ this._lookbehind = Buffer.alloc(needleLength)
+
+ // Populate occurrence table with analysis of the needle,
+ // ignoring last letter.
+ for (var i = 0; i < needleLength - 1; ++i) { // eslint-disable-line no-var
+ this._occ[needle[i]] = needleLength - 1 - i
+ }
+}
+inherits(SBMH, EventEmitter)
+
+SBMH.prototype.reset = function () {
+ this._lookbehind_size = 0
+ this.matches = 0
+ this._bufpos = 0
+}
+
+SBMH.prototype.push = function (chunk, pos) {
+ if (!Buffer.isBuffer(chunk)) {
+ chunk = Buffer.from(chunk, 'binary')
+ }
+ const chlen = chunk.length
+ this._bufpos = pos || 0
+ let r
+ while (r !== chlen && this.matches < this.maxMatches) { r = this._sbmh_feed(chunk) }
+ return r
+}
+
+SBMH.prototype._sbmh_feed = function (data) {
+ const len = data.length
+ const needle = this._needle
+ const needleLength = needle.length
+ const lastNeedleChar = needle[needleLength - 1]
+
+ // Positive: points to a position in `data`
+ // pos == 3 points to data[3]
+ // Negative: points to a position in the lookbehind buffer
+ // pos == -2 points to lookbehind[lookbehind_size - 2]
+ let pos = -this._lookbehind_size
+ let ch
+
+ if (pos < 0) {
+ // Lookbehind buffer is not empty. Perform Boyer-Moore-Horspool
+ // search with character lookup code that considers both the
+ // lookbehind buffer and the current round's haystack data.
+ //
+ // Loop until
+ // there is a match.
+ // or until
+ // we've moved past the position that requires the
+ // lookbehind buffer. In this case we switch to the
+ // optimized loop.
+ // or until
+ // the character to look at lies outside the haystack.
+ while (pos < 0 && pos <= len - needleLength) {
+ ch = this._sbmh_lookup_char(data, pos + needleLength - 1)
+
+ if (
+ ch === lastNeedleChar &&
+ this._sbmh_memcmp(data, pos, needleLength - 1)
+ ) {
+ this._lookbehind_size = 0
+ ++this.matches
+ this.emit('info', true)
+
+ return (this._bufpos = pos + needleLength)
+ }
+ pos += this._occ[ch]
+ }
+
+ // No match.
+
+ if (pos < 0) {
+ // There's too few data for Boyer-Moore-Horspool to run,
+ // so let's use a different algorithm to skip as much as
+ // we can.
+ // Forward pos until
+ // the trailing part of lookbehind + data
+ // looks like the beginning of the needle
+ // or until
+ // pos == 0
+ while (pos < 0 && !this._sbmh_memcmp(data, pos, len - pos)) { ++pos }
+ }
+
+ if (pos >= 0) {
+ // Discard lookbehind buffer.
+ this.emit('info', false, this._lookbehind, 0, this._lookbehind_size)
+ this._lookbehind_size = 0
+ } else {
+ // Cut off part of the lookbehind buffer that has
+ // been processed and append the entire haystack
+ // into it.
+ const bytesToCutOff = this._lookbehind_size + pos
+ if (bytesToCutOff > 0) {
+ // The cut off data is guaranteed not to contain the needle.
+ this.emit('info', false, this._lookbehind, 0, bytesToCutOff)
+ }
+
+ this._lookbehind.copy(this._lookbehind, 0, bytesToCutOff,
+ this._lookbehind_size - bytesToCutOff)
+ this._lookbehind_size -= bytesToCutOff
+
+ data.copy(this._lookbehind, this._lookbehind_size)
+ this._lookbehind_size += len
+
+ this._bufpos = len
+ return len
+ }
+ }
+
+ pos += (pos >= 0) * this._bufpos
+
+ // Lookbehind buffer is now empty. We only need to check if the
+ // needle is in the haystack.
+ if (data.indexOf(needle, pos) !== -1) {
+ pos = data.indexOf(needle, pos)
+ ++this.matches
+ if (pos > 0) { this.emit('info', true, data, this._bufpos, pos) } else { this.emit('info', true) }
+
+ return (this._bufpos = pos + needleLength)
+ } else {
+ pos = len - needleLength
+ }
+
+ // There was no match. If there's trailing haystack data that we cannot
+ // match yet using the Boyer-Moore-Horspool algorithm (because the trailing
+ // data is less than the needle size) then match using a modified
+ // algorithm that starts matching from the beginning instead of the end.
+ // Whatever trailing data is left after running this algorithm is added to
+ // the lookbehind buffer.
+ while (
+ pos < len &&
+ (
+ data[pos] !== needle[0] ||
+ (
+ (Buffer.compare(
+ data.subarray(pos, pos + len - pos),
+ needle.subarray(0, len - pos)
+ ) !== 0)
+ )
+ )
+ ) {
+ ++pos
+ }
+ if (pos < len) {
+ data.copy(this._lookbehind, 0, pos, pos + (len - pos))
+ this._lookbehind_size = len - pos
+ }
+
+ // Everything until pos is guaranteed not to contain needle data.
+ if (pos > 0) { this.emit('info', false, data, this._bufpos, pos < len ? pos : len) }
+
+ this._bufpos = len
+ return len
+}
+
+SBMH.prototype._sbmh_lookup_char = function (data, pos) {
+ return (pos < 0)
+ ? this._lookbehind[this._lookbehind_size + pos]
+ : data[pos]
+}
+
+SBMH.prototype._sbmh_memcmp = function (data, pos, len) {
+ for (var i = 0; i < len; ++i) { // eslint-disable-line no-var
+ if (this._sbmh_lookup_char(data, pos + i) !== this._needle[i]) { return false }
+ }
+ return true
+}
+
+module.exports = SBMH