From a56f92cdee6ae9f44e20610a59dfdff02c94a185 Mon Sep 17 00:00:00 2001 From: n1474335 Date: Wed, 2 Jan 2019 17:50:47 +0000 Subject: [PATCH] Significantly improved performance when scanning for embedded files by implementing a fastcheck algorithm. --- package-lock.json | 148 +++++++++++++++++++------------------- src/core/lib/FileType.mjs | 67 ++++++++++++++--- 2 files changed, 131 insertions(+), 84 deletions(-) diff --git a/package-lock.json b/package-lock.json index ac28bda1..fa857e05 100644 --- a/package-lock.json +++ b/package-lock.json @@ -1497,7 +1497,7 @@ }, "ansi-escapes": { "version": "3.1.0", - "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz", + "resolved": "http://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz", "integrity": "sha512-UgAb8H9D41AQnu/PbWlCofQVcnV4Gs2bBJi9eZPxfU/hgglFh3SMDMENRIqdr7H6XFnXdoknctFByVsCOotTVw==", "dev": true }, @@ -1615,7 +1615,7 @@ }, "array-equal": { "version": "1.0.0", - "resolved": "https://registry.npmjs.org/array-equal/-/array-equal-1.0.0.tgz", + "resolved": "http://registry.npmjs.org/array-equal/-/array-equal-1.0.0.tgz", "integrity": "sha1-jCpe8kcv2ep0KwTHenUJO6J1fJM=", "dev": true }, @@ -1700,7 +1700,7 @@ }, "util": { "version": "0.10.3", - "resolved": "https://registry.npmjs.org/util/-/util-0.10.3.tgz", + "resolved": "http://registry.npmjs.org/util/-/util-0.10.3.tgz", "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=", "dev": true, "requires": { @@ -1800,7 +1800,7 @@ }, "axios": { "version": "0.18.0", - "resolved": "https://registry.npmjs.org/axios/-/axios-0.18.0.tgz", + "resolved": "http://registry.npmjs.org/axios/-/axios-0.18.0.tgz", "integrity": "sha1-MtU+SFHv3AoRmTts0AB4nXDAUQI=", "dev": true, "requires": { @@ -2232,7 +2232,7 @@ }, "browserify-aes": { "version": "1.2.0", - "resolved": "https://registry.npmjs.org/browserify-aes/-/browserify-aes-1.2.0.tgz", + "resolved": "http://registry.npmjs.org/browserify-aes/-/browserify-aes-1.2.0.tgz", "integrity": "sha512-+7CHXqGuspUn/Sl5aO7Ea0xWGAtETPXNSAjHo48JfLdPWcMng33Xe4znFvQweqc/uzk5zSOI3H52CYnjCfb5hA==", "dev": true, "requires": { @@ -2269,7 +2269,7 @@ }, "browserify-rsa": { "version": "4.0.1", - "resolved": "https://registry.npmjs.org/browserify-rsa/-/browserify-rsa-4.0.1.tgz", + "resolved": "http://registry.npmjs.org/browserify-rsa/-/browserify-rsa-4.0.1.tgz", "integrity": "sha1-IeCr+vbyApzy+vsTNWenAdQTVSQ=", "dev": true, "requires": { @@ -2319,7 +2319,7 @@ }, "buffer": { "version": "4.9.1", - 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"resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz", + "resolved": "http://registry.npmjs.org/pify/-/pify-2.3.0.tgz", "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw=", "dev": true } @@ -9661,7 +9661,7 @@ "dependencies": { "async": { "version": "1.5.2", - "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz", + "resolved": "http://registry.npmjs.org/async/-/async-1.5.2.tgz", "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=", "dev": true } @@ -10073,7 +10073,7 @@ }, "progress": { "version": "1.1.8", - "resolved": "https://registry.npmjs.org/progress/-/progress-1.1.8.tgz", + "resolved": "http://registry.npmjs.org/progress/-/progress-1.1.8.tgz", "integrity": "sha1-4mDHj2Fhzdmw5WzD4Khd4Xx6V74=" }, "promise-inflight": { @@ -10098,13 +10098,13 @@ "dependencies": { "async": { "version": "1.0.0", - "resolved": "https://registry.npmjs.org/async/-/async-1.0.0.tgz", + "resolved": "http://registry.npmjs.org/async/-/async-1.0.0.tgz", "integrity": "sha1-+PwEyjoTeErenhZBr5hXjPvWR6k=", "dev": true }, "winston": { "version": "2.1.1", - "resolved": "https://registry.npmjs.org/winston/-/winston-2.1.1.tgz", + "resolved": "http://registry.npmjs.org/winston/-/winston-2.1.1.tgz", "integrity": "sha1-PJNJ0ZYgf9G9/51LxD73JRDjoS4=", "dev": true, "requires": { @@ -10119,7 +10119,7 @@ "dependencies": { "colors": { "version": "1.0.3", - "resolved": "https://registry.npmjs.org/colors/-/colors-1.0.3.tgz", + "resolved": "http://registry.npmjs.org/colors/-/colors-1.0.3.tgz", "integrity": "sha1-BDP0TYCWgP3rYO0mDxsMJi6CpAs=", "dev": true }, @@ -10342,7 +10342,7 @@ "dependencies": { "pify": { "version": "2.3.0", - "resolved": "https://registry.npmjs.org/pify/-/pify-2.3.0.tgz", + "resolved": "http://registry.npmjs.org/pify/-/pify-2.3.0.tgz", "integrity": "sha1-7RQaasBDqEnqWISY59yosVMw6Qw=", "dev": true } @@ -10531,7 +10531,7 @@ "dependencies": { "jsesc": { "version": "0.5.0", - "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-0.5.0.tgz", + "resolved": "http://registry.npmjs.org/jsesc/-/jsesc-0.5.0.tgz", "integrity": "sha1-597mbjXW/Bb3EP6R1c9p9w8IkR0=", "dev": true } @@ -10582,7 +10582,7 @@ }, "htmlparser2": { "version": "3.3.0", - "resolved": "https://registry.npmjs.org/htmlparser2/-/htmlparser2-3.3.0.tgz", + "resolved": "http://registry.npmjs.org/htmlparser2/-/htmlparser2-3.3.0.tgz", "integrity": "sha1-zHDQWln2VC5D8OaFyYLhTJJKnv4=", "dev": true, "requires": { @@ -10594,7 +10594,7 @@ }, "readable-stream": { "version": "1.0.34", - "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.0.34.tgz", + "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-1.0.34.tgz", "integrity": "sha1-Elgg40vIQtLyqq+v5MKRbuMsFXw=", "dev": true, "requires": { @@ -10704,7 +10704,7 @@ }, "require-uncached": { "version": "1.0.3", - "resolved": "https://registry.npmjs.org/require-uncached/-/require-uncached-1.0.3.tgz", + "resolved": "http://registry.npmjs.org/require-uncached/-/require-uncached-1.0.3.tgz", "integrity": "sha1-Tg1W1slmL9MeQwEcS5WqSZVUIdM=", "dev": true, "requires": { @@ -10871,7 +10871,7 @@ }, "safe-regex": { "version": "1.1.0", - "resolved": "https://registry.npmjs.org/safe-regex/-/safe-regex-1.1.0.tgz", + "resolved": "http://registry.npmjs.org/safe-regex/-/safe-regex-1.1.0.tgz", "integrity": "sha1-QKNmnzsHfR6UPURinhV91IAjvy4=", "dev": true, "requires": { @@ -11191,7 +11191,7 @@ }, "sha.js": { "version": "2.4.11", - "resolved": "https://registry.npmjs.org/sha.js/-/sha.js-2.4.11.tgz", + "resolved": "http://registry.npmjs.org/sha.js/-/sha.js-2.4.11.tgz", "integrity": "sha512-QMEp5B7cftE7APOjk5Y6xgrbWu+WkLVQwk8JNjZ8nKRciZaByEW6MubieAiToS7+dwvrjGhH8jRXz3MVd0AYqQ==", "dev": true, "requires": { @@ -11235,7 +11235,7 @@ }, "shelljs": { "version": "0.3.0", - "resolved": "https://registry.npmjs.org/shelljs/-/shelljs-0.3.0.tgz", + "resolved": "http://registry.npmjs.org/shelljs/-/shelljs-0.3.0.tgz", "integrity": "sha1-NZbmMHp4FUT1kfN9phg2DzHbV7E=", "dev": true }, @@ -11913,7 +11913,7 @@ }, "strip-ansi": { "version": "3.0.1", - "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz", + "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz", "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=", "requires": { "ansi-regex": "^2.0.0" @@ -11930,7 +11930,7 @@ }, "strip-eof": { "version": "1.0.0", - "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz", + "resolved": "http://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz", "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=", "dev": true }, @@ -12009,7 +12009,7 @@ }, "tar": { "version": "2.2.1", - "resolved": "https://registry.npmjs.org/tar/-/tar-2.2.1.tgz", + "resolved": "http://registry.npmjs.org/tar/-/tar-2.2.1.tgz", "integrity": "sha1-jk0qJWwOIYXGsYrWlK7JaLg8sdE=", "dev": true, "requires": { @@ -12064,7 +12064,7 @@ }, "through": { "version": "2.3.8", - "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz", + "resolved": "http://registry.npmjs.org/through/-/through-2.3.8.tgz", "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=", "dev": true }, @@ -12758,7 +12758,7 @@ "dependencies": { "async": { "version": "0.9.2", - "resolved": "https://registry.npmjs.org/async/-/async-0.9.2.tgz", + "resolved": "http://registry.npmjs.org/async/-/async-0.9.2.tgz", "integrity": "sha1-rqdNXmHB+JlhO/ZL2mbUx48v0X0=", "dev": true }, @@ -12784,7 +12784,7 @@ }, "valid-data-url": { "version": "0.1.6", - "resolved": "https://registry.npmjs.org/valid-data-url/-/valid-data-url-0.1.6.tgz", + "resolved": "http://registry.npmjs.org/valid-data-url/-/valid-data-url-0.1.6.tgz", "integrity": "sha512-FXg2qXMzfAhZc0y2HzELNfUeiOjPr+52hU1DNBWiJJ2luXD+dD1R9NA48Ug5aj0ibbxroeGDc/RJv6ThiGgkDw==", "dev": true }, @@ -12800,7 +12800,7 @@ }, "validator": { "version": "9.4.1", - "resolved": "https://registry.npmjs.org/validator/-/validator-9.4.1.tgz", + "resolved": "http://registry.npmjs.org/validator/-/validator-9.4.1.tgz", "integrity": "sha512-YV5KjzvRmSyJ1ee/Dm5UED0G+1L4GZnLN3w6/T+zZm8scVua4sOhYKWTUrKa0H/tMiJyO9QLHMPN+9mB/aMunA==", "dev": true }, @@ -13296,7 +13296,7 @@ }, "webpack-node-externals": { "version": "1.7.2", - "resolved": "https://registry.npmjs.org/webpack-node-externals/-/webpack-node-externals-1.7.2.tgz", + "resolved": "http://registry.npmjs.org/webpack-node-externals/-/webpack-node-externals-1.7.2.tgz", "integrity": "sha512-ajerHZ+BJKeCLviLUUmnyd5B4RavLF76uv3cs6KNuO8W+HuQaEs0y0L7o40NQxdPy5w0pcv8Ew7yPUAQG0UdCg==", "dev": true }, @@ -13450,14 +13450,14 @@ "dependencies": { "async": { "version": "1.0.0", - "resolved": "https://registry.npmjs.org/async/-/async-1.0.0.tgz", + "resolved": "http://registry.npmjs.org/async/-/async-1.0.0.tgz", "integrity": "sha1-+PwEyjoTeErenhZBr5hXjPvWR6k=", "dev": true, "optional": true }, "colors": { "version": "1.0.3", - "resolved": "https://registry.npmjs.org/colors/-/colors-1.0.3.tgz", + "resolved": "http://registry.npmjs.org/colors/-/colors-1.0.3.tgz", "integrity": "sha1-BDP0TYCWgP3rYO0mDxsMJi6CpAs=", "dev": true, "optional": true @@ -13490,7 +13490,7 @@ }, "wrap-ansi": { "version": "2.1.0", - "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz", + "resolved": "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz", "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=", "dev": true, "requires": { diff --git a/src/core/lib/FileType.mjs b/src/core/lib/FileType.mjs index 5e1dd657..93c7634a 100644 --- a/src/core/lib/FileType.mjs +++ b/src/core/lib/FileType.mjs @@ -128,17 +128,58 @@ export function scanForFileTypes(buf) { for (let i = 0; i < category.length; i++) { const filetype = category[i]; - for (let pos = 0; pos < buf.length; pos++) { - if (signatureMatches(filetype.signature, buf, pos)) { - foundFiles.push({ - offset: pos, - fileDetails: filetype - }); + const sigs = filetype.signature.length ? filetype.signature : [filetype.signature]; + + sigs.forEach(sig => { + let pos = 0; + while ((pos = locatePotentialSig(buf, sig, pos)) >= 0) { + if (signatureMatches(sig, buf, pos)) { + foundFiles.push({ + offset: pos, + fileDetails: filetype + }); + } + pos++; } - } + }); } } - return foundFiles; + + // Return found files in order of increasing offset + return foundFiles.sort((a, b) => { + return a.offset - b.offset; + }); +} + + +/** + * Fastcheck function to quickly scan the buffer for the first byte in a signature. + * + * @param {Uint8Array} buf - The buffer to search + * @param {Object} sig - A single signature object (Not an array of signatures) + * @param {number} offset - Where to start search from + * @returs {number} The position of the match or -1 if one cannot be found. + */ +function locatePotentialSig(buf, sig, offset) { + // Find values for first key and value in sig + const k = parseInt(Object.keys(sig)[0], 10); + const v = Object.values(sig)[0]; + switch (typeof v) { + case "number": + return buf.indexOf(v, offset + k) - k; + case "object": + for (let i = offset + k; i < buf.length; i++) { + if (v.indexOf(buf[i]) >= 0) return i - k; + } + return -1; + case "function": + for (let i = offset + k; i < buf.length; i++) { + if (v(buf[i])) return i - k; + } + return -1; + default: + throw new Error("Unrecognised signature type"); + } } @@ -155,9 +196,15 @@ export function isType(type, buf) { if (!(types && types.length)) return false; if (typeof type === "string") { - return types[0].mime.startsWith(type) ? types[0].mime : false; + return types.reduce((acc, t) => { + const mime = t.mime.startsWith(type) ? t.mime : false; + return acc || mime; + }, false); } else if (type instanceof RegExp) { - return type.test(types[0].mime) ? types[0].mime : false; + return types.reduce((acc, t) => { + const mime = type.test(t.mime) ? t.mime : false; + return acc || mime; + }, false); } else { throw new Error("Invalid type input."); }