diff options
Diffstat (limited to 'deps/node/deps/npm/node_modules/node-gyp/node_modules/tar/lib/header.js')
| -rw-r--r-- | deps/node/deps/npm/node_modules/node-gyp/node_modules/tar/lib/header.js | 384 |
1 files changed, 0 insertions, 384 deletions
diff --git a/deps/node/deps/npm/node_modules/node-gyp/node_modules/tar/lib/header.js b/deps/node/deps/npm/node_modules/node-gyp/node_modules/tar/lib/header.js deleted file mode 100644 index 3741d5d3..00000000 --- a/deps/node/deps/npm/node_modules/node-gyp/node_modules/tar/lib/header.js +++ /dev/null @@ -1,384 +0,0 @@ -// parse a 512-byte header block to a data object, or vice-versa -// If the data won't fit nicely in a simple header, then generate -// the appropriate extended header file, and return that. - -module.exports = TarHeader - -var tar = require("../tar.js") - , fields = tar.fields - , fieldOffs = tar.fieldOffs - , fieldEnds = tar.fieldEnds - , fieldSize = tar.fieldSize - , numeric = tar.numeric - , assert = require("assert").ok - , space = " ".charCodeAt(0) - , slash = "/".charCodeAt(0) - , bslash = process.platform === "win32" ? "\\".charCodeAt(0) : null - -function TarHeader (block) { - if (!(this instanceof TarHeader)) return new TarHeader(block) - if (block) this.decode(block) -} - -TarHeader.prototype = - { decode : decode - , encode: encode - , calcSum: calcSum - , checkSum: checkSum - } - -TarHeader.parseNumeric = parseNumeric -TarHeader.encode = encode -TarHeader.decode = decode - -// note that this will only do the normal ustar header, not any kind -// of extended posix header file. If something doesn't fit comfortably, -// then it will set obj.needExtended = true, and set the block to -// the closest approximation. -function encode (obj) { - if (!obj && !(this instanceof TarHeader)) throw new Error( - "encode must be called on a TarHeader, or supplied an object") - - obj = obj || this - var block = obj.block = new Buffer(512) - - // if the object has a "prefix", then that's actually an extension of - // the path field. - if (obj.prefix) { - // console.error("%% header encoding, got a prefix", obj.prefix) - obj.path = obj.prefix + "/" + obj.path - // console.error("%% header encoding, prefixed path", obj.path) - obj.prefix = "" - } - - obj.needExtended = false - - if (obj.mode) { - if (typeof obj.mode === "string") obj.mode = parseInt(obj.mode, 8) - obj.mode = obj.mode & 0777 - } - - for (var f = 0; fields[f] !== null; f ++) { - var field = fields[f] - , off = fieldOffs[f] - , end = fieldEnds[f] - , ret - - switch (field) { - case "cksum": - // special, done below, after all the others - break - - case "prefix": - // special, this is an extension of the "path" field. - // console.error("%% header encoding, skip prefix later") - break - - case "type": - // convert from long name to a single char. - var type = obj.type || "0" - if (type.length > 1) { - type = tar.types[obj.type] - if (!type) type = "0" - } - writeText(block, off, end, type) - break - - case "path": - // uses the "prefix" field if > 100 bytes, but <= 255 - var pathLen = Buffer.byteLength(obj.path) - , pathFSize = fieldSize[fields.path] - , prefFSize = fieldSize[fields.prefix] - - // paths between 100 and 255 should use the prefix field. - // longer than 255 - if (pathLen > pathFSize && - pathLen <= pathFSize + prefFSize) { - // need to find a slash somewhere in the middle so that - // path and prefix both fit in their respective fields - var searchStart = pathLen - 1 - pathFSize - , searchEnd = prefFSize - , found = false - , pathBuf = new Buffer(obj.path) - - for ( var s = searchStart - ; (s <= searchEnd) - ; s ++ ) { - if (pathBuf[s] === slash || pathBuf[s] === bslash) { - found = s - break - } - } - - if (found !== false) { - prefix = pathBuf.slice(0, found).toString("utf8") - path = pathBuf.slice(found + 1).toString("utf8") - - ret = writeText(block, off, end, path) - off = fieldOffs[fields.prefix] - end = fieldEnds[fields.prefix] - // console.error("%% header writing prefix", off, end, prefix) - ret = writeText(block, off, end, prefix) || ret - break - } - } - - // paths less than 100 chars don't need a prefix - // and paths longer than 255 need an extended header and will fail - // on old implementations no matter what we do here. - // Null out the prefix, and fallthrough to default. - // console.error("%% header writing no prefix") - var poff = fieldOffs[fields.prefix] - , pend = fieldEnds[fields.prefix] - writeText(block, poff, pend, "") - // fallthrough - - // all other fields are numeric or text - default: - ret = numeric[field] - ? writeNumeric(block, off, end, obj[field]) - : writeText(block, off, end, obj[field] || "") - break - } - obj.needExtended = obj.needExtended || ret - } - - var off = fieldOffs[fields.cksum] - , end = fieldEnds[fields.cksum] - - writeNumeric(block, off, end, calcSum.call(this, block)) - - return block -} - -// if it's a negative number, or greater than will fit, -// then use write256. -var MAXNUM = { 12: 077777777777 - , 11: 07777777777 - , 8 : 07777777 - , 7 : 0777777 } -function writeNumeric (block, off, end, num) { - var writeLen = end - off - , maxNum = MAXNUM[writeLen] || 0 - - num = num || 0 - // console.error(" numeric", num) - - if (num instanceof Date || - Object.prototype.toString.call(num) === "[object Date]") { - num = num.getTime() / 1000 - } - - if (num > maxNum || num < 0) { - write256(block, off, end, num) - // need an extended header if negative or too big. - return true - } - - // god, tar is so annoying - // if the string is small enough, you should put a space - // between the octal string and the \0, but if it doesn't - // fit, then don't. - var numStr = Math.floor(num).toString(8) - if (num < MAXNUM[writeLen - 1]) numStr += " " - - // pad with "0" chars - if (numStr.length < writeLen) { - numStr = (new Array(writeLen - numStr.length).join("0")) + numStr - } - - if (numStr.length !== writeLen - 1) { - throw new Error("invalid length: " + JSON.stringify(numStr) + "\n" + - "expected: "+writeLen) - } - block.write(numStr, off, writeLen, "utf8") - block[end - 1] = 0 -} - -function write256 (block, off, end, num) { - var buf = block.slice(off, end) - var positive = num >= 0 - buf[0] = positive ? 0x80 : 0xFF - - // get the number as a base-256 tuple - if (!positive) num *= -1 - var tuple = [] - do { - var n = num % 256 - tuple.push(n) - num = (num - n) / 256 - } while (num) - - var bytes = tuple.length - - var fill = buf.length - bytes - for (var i = 1; i < fill; i ++) { - buf[i] = positive ? 0 : 0xFF - } - - // tuple is a base256 number, with [0] as the *least* significant byte - // if it's negative, then we need to flip all the bits once we hit the - // first non-zero bit. The 2's-complement is (0x100 - n), and the 1's- - // complement is (0xFF - n). - var zero = true - for (i = bytes; i > 0; i --) { - var byte = tuple[bytes - i] - if (positive) buf[fill + i] = byte - else if (zero && byte === 0) buf[fill + i] = 0 - else if (zero) { - zero = false - buf[fill + i] = 0x100 - byte - } else buf[fill + i] = 0xFF - byte - } -} - -function writeText (block, off, end, str) { - // strings are written as utf8, then padded with \0 - var strLen = Buffer.byteLength(str) - , writeLen = Math.min(strLen, end - off) - // non-ascii fields need extended headers - // long fields get truncated - , needExtended = strLen !== str.length || strLen > writeLen - - // write the string, and null-pad - if (writeLen > 0) block.write(str, off, writeLen, "utf8") - for (var i = off + writeLen; i < end; i ++) block[i] = 0 - - return needExtended -} - -function calcSum (block) { - block = block || this.block - assert(Buffer.isBuffer(block) && block.length === 512) - - if (!block) throw new Error("Need block to checksum") - - // now figure out what it would be if the cksum was " " - var sum = 0 - , start = fieldOffs[fields.cksum] - , end = fieldEnds[fields.cksum] - - for (var i = 0; i < fieldOffs[fields.cksum]; i ++) { - sum += block[i] - } - - for (var i = start; i < end; i ++) { - sum += space - } - - for (var i = end; i < 512; i ++) { - sum += block[i] - } - - return sum -} - - -function checkSum (block) { - var sum = calcSum.call(this, block) - block = block || this.block - - var cksum = block.slice(fieldOffs[fields.cksum], fieldEnds[fields.cksum]) - cksum = parseNumeric(cksum) - - return cksum === sum -} - -function decode (block) { - block = block || this.block - assert(Buffer.isBuffer(block) && block.length === 512) - - this.block = block - this.cksumValid = this.checkSum() - - var prefix = null - - // slice off each field. - for (var f = 0; fields[f] !== null; f ++) { - var field = fields[f] - , val = block.slice(fieldOffs[f], fieldEnds[f]) - - switch (field) { - case "ustar": - // if not ustar, then everything after that is just padding. - if (val.toString() !== "ustar\0") { - this.ustar = false - return - } else { - // console.error("ustar:", val, val.toString()) - this.ustar = val.toString() - } - break - - // prefix is special, since it might signal the xstar header - case "prefix": - var atime = parseNumeric(val.slice(131, 131 + 12)) - , ctime = parseNumeric(val.slice(131 + 12, 131 + 12 + 12)) - if ((val[130] === 0 || val[130] === space) && - typeof atime === "number" && - typeof ctime === "number" && - val[131 + 12] === space && - val[131 + 12 + 12] === space) { - this.atime = atime - this.ctime = ctime - val = val.slice(0, 130) - } - prefix = val.toString("utf8").replace(/\0+$/, "") - // console.error("%% header reading prefix", prefix) - break - - // all other fields are null-padding text - // or a number. - default: - if (numeric[field]) { - this[field] = parseNumeric(val) - } else { - this[field] = val.toString("utf8").replace(/\0+$/, "") - } - break - } - } - - // if we got a prefix, then prepend it to the path. - if (prefix) { - this.path = prefix + "/" + this.path - // console.error("%% header got a prefix", this.path) - } -} - -function parse256 (buf) { - // first byte MUST be either 80 or FF - // 80 for positive, FF for 2's comp - var positive - if (buf[0] === 0x80) positive = true - else if (buf[0] === 0xFF) positive = false - else return null - - // build up a base-256 tuple from the least sig to the highest - var zero = false - , tuple = [] - for (var i = buf.length - 1; i > 0; i --) { - var byte = buf[i] - if (positive) tuple.push(byte) - else if (zero && byte === 0) tuple.push(0) - else if (zero) { - zero = false - tuple.push(0x100 - byte) - } else tuple.push(0xFF - byte) - } - - for (var sum = 0, i = 0, l = tuple.length; i < l; i ++) { - sum += tuple[i] * Math.pow(256, i) - } - - return positive ? sum : -1 * sum -} - -function parseNumeric (f) { - if (f[0] & 0x80) return parse256(f) - - var str = f.toString("utf8").split("\0")[0].trim() - , res = parseInt(str, 8) - - return isNaN(res) ? null : res -} |