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authorHeiner Lohaus <heiner@lohaus.eu>2023-10-28 07:21:00 +0200
committerHeiner Lohaus <heiner@lohaus.eu>2023-10-28 07:21:00 +0200
commitdc04ca93060443a3ce6263a476f4dafc66afc6b3 (patch)
treeb9c645cbe897af198ea0551509f901a249af35f2 /g4f/Provider/npm/node_modules/@fastify/busboy/deps
parentUpdate config supports_message_history (diff)
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Diffstat (limited to 'g4f/Provider/npm/node_modules/@fastify/busboy/deps')
-rw-r--r--g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/LICENSE19
-rw-r--r--g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/lib/Dicer.js207
-rw-r--r--g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/lib/HeaderParser.js100
-rw-r--r--g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/lib/PartStream.js13
-rw-r--r--g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/lib/dicer.d.ts164
-rw-r--r--g4f/Provider/npm/node_modules/@fastify/busboy/deps/streamsearch/sbmh.js228
6 files changed, 731 insertions, 0 deletions
diff --git a/g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/LICENSE b/g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/LICENSE
new file mode 100644
index 00000000..290762e9
--- /dev/null
+++ b/g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/LICENSE
@@ -0,0 +1,19 @@
+Copyright Brian White. All rights reserved.
+
+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. \ No newline at end of file
diff --git a/g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/lib/Dicer.js b/g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/lib/Dicer.js
new file mode 100644
index 00000000..79da160c
--- /dev/null
+++ b/g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/lib/Dicer.js
@@ -0,0 +1,207 @@
+'use strict'
+
+const WritableStream = require('node:stream').Writable
+const inherits = require('node:util').inherits
+
+const StreamSearch = require('../../streamsearch/sbmh')
+
+const PartStream = require('./PartStream')
+const HeaderParser = require('./HeaderParser')
+
+const DASH = 45
+const B_ONEDASH = Buffer.from('-')
+const B_CRLF = Buffer.from('\r\n')
+const EMPTY_FN = function () {}
+
+function Dicer (cfg) {
+ if (!(this instanceof Dicer)) { return new Dicer(cfg) }
+ WritableStream.call(this, cfg)
+
+ if (!cfg || (!cfg.headerFirst && typeof cfg.boundary !== 'string')) { throw new TypeError('Boundary required') }
+
+ if (typeof cfg.boundary === 'string') { this.setBoundary(cfg.boundary) } else { this._bparser = undefined }
+
+ this._headerFirst = cfg.headerFirst
+
+ this._dashes = 0
+ this._parts = 0
+ this._finished = false
+ this._realFinish = false
+ this._isPreamble = true
+ this._justMatched = false
+ this._firstWrite = true
+ this._inHeader = true
+ this._part = undefined
+ this._cb = undefined
+ this._ignoreData = false
+ this._partOpts = { highWaterMark: cfg.partHwm }
+ this._pause = false
+
+ const self = this
+ this._hparser = new HeaderParser(cfg)
+ this._hparser.on('header', function (header) {
+ self._inHeader = false
+ self._part.emit('header', header)
+ })
+}
+inherits(Dicer, WritableStream)
+
+Dicer.prototype.emit = function (ev) {
+ if (ev === 'finish' && !this._realFinish) {
+ if (!this._finished) {
+ const self = this
+ process.nextTick(function () {
+ self.emit('error', new Error('Unexpected end of multipart data'))
+ if (self._part && !self._ignoreData) {
+ const type = (self._isPreamble ? 'Preamble' : 'Part')
+ self._part.emit('error', new Error(type + ' terminated early due to unexpected end of multipart data'))
+ self._part.push(null)
+ process.nextTick(function () {
+ self._realFinish = true
+ self.emit('finish')
+ self._realFinish = false
+ })
+ return
+ }
+ self._realFinish = true
+ self.emit('finish')
+ self._realFinish = false
+ })
+ }
+ } else { WritableStream.prototype.emit.apply(this, arguments) }
+}
+
+Dicer.prototype._write = function (data, encoding, cb) {
+ // ignore unexpected data (e.g. extra trailer data after finished)
+ if (!this._hparser && !this._bparser) { return cb() }
+
+ if (this._headerFirst && this._isPreamble) {
+ if (!this._part) {
+ this._part = new PartStream(this._partOpts)
+ if (this._events.preamble) { this.emit('preamble', this._part) } else { this._ignore() }
+ }
+ const r = this._hparser.push(data)
+ if (!this._inHeader && r !== undefined && r < data.length) { data = data.slice(r) } else { return cb() }
+ }
+
+ // allows for "easier" testing
+ if (this._firstWrite) {
+ this._bparser.push(B_CRLF)
+ this._firstWrite = false
+ }
+
+ this._bparser.push(data)
+
+ if (this._pause) { this._cb = cb } else { cb() }
+}
+
+Dicer.prototype.reset = function () {
+ this._part = undefined
+ this._bparser = undefined
+ this._hparser = undefined
+}
+
+Dicer.prototype.setBoundary = function (boundary) {
+ const self = this
+ this._bparser = new StreamSearch('\r\n--' + boundary)
+ this._bparser.on('info', function (isMatch, data, start, end) {
+ self._oninfo(isMatch, data, start, end)
+ })
+}
+
+Dicer.prototype._ignore = function () {
+ if (this._part && !this._ignoreData) {
+ this._ignoreData = true
+ this._part.on('error', EMPTY_FN)
+ // we must perform some kind of read on the stream even though we are
+ // ignoring the data, otherwise node's Readable stream will not emit 'end'
+ // after pushing null to the stream
+ this._part.resume()
+ }
+}
+
+Dicer.prototype._oninfo = function (isMatch, data, start, end) {
+ let buf; const self = this; let i = 0; let r; let shouldWriteMore = true
+
+ if (!this._part && this._justMatched && data) {
+ while (this._dashes < 2 && (start + i) < end) {
+ if (data[start + i] === DASH) {
+ ++i
+ ++this._dashes
+ } else {
+ if (this._dashes) { buf = B_ONEDASH }
+ this._dashes = 0
+ break
+ }
+ }
+ if (this._dashes === 2) {
+ if ((start + i) < end && this._events.trailer) { this.emit('trailer', data.slice(start + i, end)) }
+ this.reset()
+ this._finished = true
+ // no more parts will be added
+ if (self._parts === 0) {
+ self._realFinish = true
+ self.emit('finish')
+ self._realFinish = false
+ }
+ }
+ if (this._dashes) { return }
+ }
+ if (this._justMatched) { this._justMatched = false }
+ if (!this._part) {
+ this._part = new PartStream(this._partOpts)
+ this._part._read = function (n) {
+ self._unpause()
+ }
+ if (this._isPreamble && this._events.preamble) { this.emit('preamble', this._part) } else if (this._isPreamble !== true && this._events.part) { this.emit('part', this._part) } else { this._ignore() }
+ if (!this._isPreamble) { this._inHeader = true }
+ }
+ if (data && start < end && !this._ignoreData) {
+ if (this._isPreamble || !this._inHeader) {
+ if (buf) { shouldWriteMore = this._part.push(buf) }
+ shouldWriteMore = this._part.push(data.slice(start, end))
+ if (!shouldWriteMore) { this._pause = true }
+ } else if (!this._isPreamble && this._inHeader) {
+ if (buf) { this._hparser.push(buf) }
+ r = this._hparser.push(data.slice(start, end))
+ if (!this._inHeader && r !== undefined && r < end) { this._oninfo(false, data, start + r, end) }
+ }
+ }
+ if (isMatch) {
+ this._hparser.reset()
+ if (this._isPreamble) { this._isPreamble = false } else {
+ if (start !== end) {
+ ++this._parts
+ this._part.on('end', function () {
+ if (--self._parts === 0) {
+ if (self._finished) {
+ self._realFinish = true
+ self.emit('finish')
+ self._realFinish = false
+ } else {
+ self._unpause()
+ }
+ }
+ })
+ }
+ }
+ this._part.push(null)
+ this._part = undefined
+ this._ignoreData = false
+ this._justMatched = true
+ this._dashes = 0
+ }
+}
+
+Dicer.prototype._unpause = function () {
+ if (!this._pause) { return }
+
+ this._pause = false
+ if (this._cb) {
+ const cb = this._cb
+ this._cb = undefined
+ cb()
+ }
+}
+
+module.exports = Dicer
diff --git a/g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/lib/HeaderParser.js b/g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/lib/HeaderParser.js
new file mode 100644
index 00000000..65f667b5
--- /dev/null
+++ b/g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/lib/HeaderParser.js
@@ -0,0 +1,100 @@
+'use strict'
+
+const EventEmitter = require('node:events').EventEmitter
+const inherits = require('node:util').inherits
+const getLimit = require('../../../lib/utils/getLimit')
+
+const StreamSearch = require('../../streamsearch/sbmh')
+
+const B_DCRLF = Buffer.from('\r\n\r\n')
+const RE_CRLF = /\r\n/g
+const RE_HDR = /^([^:]+):[ \t]?([\x00-\xFF]+)?$/ // eslint-disable-line no-control-regex
+
+function HeaderParser (cfg) {
+ EventEmitter.call(this)
+
+ cfg = cfg || {}
+ const self = this
+ this.nread = 0
+ this.maxed = false
+ this.npairs = 0
+ this.maxHeaderPairs = getLimit(cfg, 'maxHeaderPairs', 2000)
+ this.maxHeaderSize = getLimit(cfg, 'maxHeaderSize', 80 * 1024)
+ this.buffer = ''
+ this.header = {}
+ this.finished = false
+ this.ss = new StreamSearch(B_DCRLF)
+ this.ss.on('info', function (isMatch, data, start, end) {
+ if (data && !self.maxed) {
+ if (self.nread + end - start >= self.maxHeaderSize) {
+ end = self.maxHeaderSize - self.nread + start
+ self.nread = self.maxHeaderSize
+ self.maxed = true
+ } else { self.nread += (end - start) }
+
+ self.buffer += data.toString('binary', start, end)
+ }
+ if (isMatch) { self._finish() }
+ })
+}
+inherits(HeaderParser, EventEmitter)
+
+HeaderParser.prototype.push = function (data) {
+ const r = this.ss.push(data)
+ if (this.finished) { return r }
+}
+
+HeaderParser.prototype.reset = function () {
+ this.finished = false
+ this.buffer = ''
+ this.header = {}
+ this.ss.reset()
+}
+
+HeaderParser.prototype._finish = function () {
+ if (this.buffer) { this._parseHeader() }
+ this.ss.matches = this.ss.maxMatches
+ const header = this.header
+ this.header = {}
+ this.buffer = ''
+ this.finished = true
+ this.nread = this.npairs = 0
+ this.maxed = false
+ this.emit('header', header)
+}
+
+HeaderParser.prototype._parseHeader = function () {
+ if (this.npairs === this.maxHeaderPairs) { return }
+
+ const lines = this.buffer.split(RE_CRLF)
+ const len = lines.length
+ let m, h
+
+ for (var i = 0; i < len; ++i) { // eslint-disable-line no-var
+ if (lines[i].length === 0) { continue }
+ if (lines[i][0] === '\t' || lines[i][0] === ' ') {
+ // folded header content
+ // RFC2822 says to just remove the CRLF and not the whitespace following
+ // it, so we follow the RFC and include the leading whitespace ...
+ if (h) {
+ this.header[h][this.header[h].length - 1] += lines[i]
+ continue
+ }
+ }
+
+ const posColon = lines[i].indexOf(':')
+ if (
+ posColon === -1 ||
+ posColon === 0
+ ) {
+ return
+ }
+ m = RE_HDR.exec(lines[i])
+ h = m[1].toLowerCase()
+ this.header[h] = this.header[h] || []
+ this.header[h].push((m[2] || ''))
+ if (++this.npairs === this.maxHeaderPairs) { break }
+ }
+}
+
+module.exports = HeaderParser
diff --git a/g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/lib/PartStream.js b/g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/lib/PartStream.js
new file mode 100644
index 00000000..c91da1c4
--- /dev/null
+++ b/g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/lib/PartStream.js
@@ -0,0 +1,13 @@
+'use strict'
+
+const inherits = require('node:util').inherits
+const ReadableStream = require('node:stream').Readable
+
+function PartStream (opts) {
+ ReadableStream.call(this, opts)
+}
+inherits(PartStream, ReadableStream)
+
+PartStream.prototype._read = function (n) {}
+
+module.exports = PartStream
diff --git a/g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/lib/dicer.d.ts b/g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/lib/dicer.d.ts
new file mode 100644
index 00000000..3c5b8962
--- /dev/null
+++ b/g4f/Provider/npm/node_modules/@fastify/busboy/deps/dicer/lib/dicer.d.ts
@@ -0,0 +1,164 @@
+// Type definitions for dicer 0.2
+// Project: https://github.com/mscdex/dicer
+// Definitions by: BendingBender <https://github.com/BendingBender>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
+/// <reference types="node" />
+
+import stream = require("stream");
+
+// tslint:disable:unified-signatures
+
+/**
+ * A very fast streaming multipart parser for node.js.
+ * Dicer is a WritableStream
+ *
+ * Dicer (special) events:
+ * - on('finish', ()) - Emitted when all parts have been parsed and the Dicer instance has been ended.
+ * - on('part', (stream: PartStream)) - Emitted when a new part has been found.
+ * - on('preamble', (stream: PartStream)) - Emitted for preamble if you should happen to need it (can usually be ignored).
+ * - on('trailer', (data: Buffer)) - Emitted when trailing data was found after the terminating boundary (as with the preamble, this can usually be ignored too).
+ */
+export class Dicer extends stream.Writable {
+ /**
+ * Creates and returns a new Dicer instance with the following valid config settings:
+ *
+ * @param config The configuration to use
+ */
+ constructor(config: Dicer.Config);
+ /**
+ * Sets the boundary to use for parsing and performs some initialization needed for parsing.
+ * You should only need to use this if you set headerFirst to true in the constructor and are parsing the boundary from the preamble header.
+ *
+ * @param boundary The boundary to use
+ */
+ setBoundary(boundary: string): void;
+ addListener(event: "finish", listener: () => void): this;
+ addListener(event: "part", listener: (stream: Dicer.PartStream) => void): this;
+ addListener(event: "preamble", listener: (stream: Dicer.PartStream) => void): this;
+ addListener(event: "trailer", listener: (data: Buffer) => void): this;
+ addListener(event: "close", listener: () => void): this;
+ addListener(event: "drain", listener: () => void): this;
+ addListener(event: "error", listener: (err: Error) => void): this;
+ addListener(event: "pipe", listener: (src: stream.Readable) => void): this;
+ addListener(event: "unpipe", listener: (src: stream.Readable) => void): this;
+ addListener(event: string, listener: (...args: any[]) => void): this;
+ on(event: "finish", listener: () => void): this;
+ on(event: "part", listener: (stream: Dicer.PartStream) => void): this;
+ on(event: "preamble", listener: (stream: Dicer.PartStream) => void): this;
+ on(event: "trailer", listener: (data: Buffer) => void): this;
+ on(event: "close", listener: () => void): this;
+ on(event: "drain", listener: () => void): this;
+ on(event: "error", listener: (err: Error) => void): this;
+ on(event: "pipe", listener: (src: stream.Readable) => void): this;
+ on(event: "unpipe", listener: (src: stream.Readable) => void): this;
+ on(event: string, listener: (...args: any[]) => void): this;
+ once(event: "finish", listener: () => void): this;
+ once(event: "part", listener: (stream: Dicer.PartStream) => void): this;
+ once(event: "preamble", listener: (stream: Dicer.PartStream) => void): this;
+ once(event: "trailer", listener: (data: Buffer) => void): this;
+ once(event: "close", listener: () => void): this;
+ once(event: "drain", listener: () => void): this;
+ once(event: "error", listener: (err: Error) => void): this;
+ once(event: "pipe", listener: (src: stream.Readable) => void): this;
+ once(event: "unpipe", listener: (src: stream.Readable) => void): this;
+ once(event: string, listener: (...args: any[]) => void): this;
+ prependListener(event: "finish", listener: () => void): this;
+ prependListener(event: "part", listener: (stream: Dicer.PartStream) => void): this;
+ prependListener(event: "preamble", listener: (stream: Dicer.PartStream) => void): this;
+ prependListener(event: "trailer", listener: (data: Buffer) => void): this;
+ prependListener(event: "close", listener: () => void): this;
+ prependListener(event: "drain", listener: () => void): this;
+ prependListener(event: "error", listener: (err: Error) => void): this;
+ prependListener(event: "pipe", listener: (src: stream.Readable) => void): this;
+ prependListener(event: "unpipe", listener: (src: stream.Readable) => void): this;
+ prependListener(event: string, listener: (...args: any[]) => void): this;
+ prependOnceListener(event: "finish", listener: () => void): this;
+ prependOnceListener(event: "part", listener: (stream: Dicer.PartStream) => void): this;
+ prependOnceListener(event: "preamble", listener: (stream: Dicer.PartStream) => void): this;
+ prependOnceListener(event: "trailer", listener: (data: Buffer) => void): this;
+ prependOnceListener(event: "close", listener: () => void): this;
+ prependOnceListener(event: "drain", listener: () => void): this;
+ prependOnceListener(event: "error", listener: (err: Error) => void): this;
+ prependOnceListener(event: "pipe", listener: (src: stream.Readable) => void): this;
+ prependOnceListener(event: "unpipe", listener: (src: stream.Readable) => void): this;
+ prependOnceListener(event: string, listener: (...args: any[]) => void): this;
+ removeListener(event: "finish", listener: () => void): this;
+ removeListener(event: "part", listener: (stream: Dicer.PartStream) => void): this;
+ removeListener(event: "preamble", listener: (stream: Dicer.PartStream) => void): this;
+ removeListener(event: "trailer", listener: (data: Buffer) => void): this;
+ removeListener(event: "close", listener: () => void): this;
+ removeListener(event: "drain", listener: () => void): this;
+ removeListener(event: "error", listener: (err: Error) => void): this;
+ removeListener(event: "pipe", listener: (src: stream.Readable) => void): this;
+ removeListener(event: "unpipe", listener: (src: stream.Readable) => void): this;
+ removeListener(event: string, listener: (...args: any[]) => void): this;
+}
+
+declare namespace Dicer {
+ interface Config {
+ /**
+ * This is the boundary used to detect the beginning of a new part.
+ */
+ boundary?: string | undefined;
+ /**
+ * If true, preamble header parsing will be performed first.
+ */
+ headerFirst?: boolean | undefined;
+ /**
+ * The maximum number of header key=>value pairs to parse Default: 2000 (same as node's http).
+ */
+ maxHeaderPairs?: number | undefined;
+ }
+
+ /**
+ * PartStream is a _ReadableStream_
+ *
+ * PartStream (special) events:
+ * - on('header', (header: object)) - An object containing the header for this particular part. Each property value is an array of one or more string values.
+ */
+ interface PartStream extends stream.Readable {
+ addListener(event: "header", listener: (header: object) => void): this;
+ addListener(event: "close", listener: () => void): this;
+ addListener(event: "data", listener: (chunk: Buffer | string) => void): this;
+ addListener(event: "end", listener: () => void): this;
+ addListener(event: "readable", listener: () => void): this;
+ addListener(event: "error", listener: (err: Error) => void): this;
+ addListener(event: string, listener: (...args: any[]) => void): this;
+ on(event: "header", listener: (header: object) => void): this;
+ on(event: "close", listener: () => void): this;
+ on(event: "data", listener: (chunk: Buffer | string) => void): this;
+ on(event: "end", listener: () => void): this;
+ on(event: "readable", listener: () => void): this;
+ on(event: "error", listener: (err: Error) => void): this;
+ on(event: string, listener: (...args: any[]) => void): this;
+ once(event: "header", listener: (header: object) => void): this;
+ once(event: "close", listener: () => void): this;
+ once(event: "data", listener: (chunk: Buffer | string) => void): this;
+ once(event: "end", listener: () => void): this;
+ once(event: "readable", listener: () => void): this;
+ once(event: "error", listener: (err: Error) => void): this;
+ once(event: string, listener: (...args: any[]) => void): this;
+ prependListener(event: "header", listener: (header: object) => void): this;
+ prependListener(event: "close", listener: () => void): this;
+ prependListener(event: "data", listener: (chunk: Buffer | string) => void): this;
+ prependListener(event: "end", listener: () => void): this;
+ prependListener(event: "readable", listener: () => void): this;
+ prependListener(event: "error", listener: (err: Error) => void): this;
+ prependListener(event: string, listener: (...args: any[]) => void): this;
+ prependOnceListener(event: "header", listener: (header: object) => void): this;
+ prependOnceListener(event: "close", listener: () => void): this;
+ prependOnceListener(event: "data", listener: (chunk: Buffer | string) => void): this;
+ prependOnceListener(event: "end", listener: () => void): this;
+ prependOnceListener(event: "readable", listener: () => void): this;
+ prependOnceListener(event: "error", listener: (err: Error) => void): this;
+ prependOnceListener(event: string, listener: (...args: any[]) => void): this;
+ removeListener(event: "header", listener: (header: object) => void): this;
+ removeListener(event: "close", listener: () => void): this;
+ removeListener(event: "data", listener: (chunk: Buffer | string) => void): this;
+ removeListener(event: "end", listener: () => void): this;
+ removeListener(event: "readable", listener: () => void): this;
+ removeListener(event: "error", listener: (err: Error) => void): this;
+ removeListener(event: string, listener: (...args: any[]) => void): this;
+ }
+} \ No newline at end of file
diff --git a/g4f/Provider/npm/node_modules/@fastify/busboy/deps/streamsearch/sbmh.js b/g4f/Provider/npm/node_modules/@fastify/busboy/deps/streamsearch/sbmh.js
new file mode 100644
index 00000000..b90c0e86
--- /dev/null
+++ b/g4f/Provider/npm/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