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智能照明系统APP-本地串口
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<a href="../../index.html">All files</a> / <a href="index.html">tar/lib</a> replace.js
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">'use strict'
&nbsp;
// tar -r
const hlo = require('./high-level-opt.js')
const Pack = require('./pack.js')
const Parse = require('./parse.js')
const fs = require('fs')
const fsm = require('fs-minipass')
const t = require('./list.js')
const path = require('path')
&nbsp;
// starting at the head of the file, read a Header
// If the checksum is invalid, that's our position to start writing
// If it is, jump forward by the specified size (round up to 512)
// and try again.
// Write the new Pack stream starting there.
&nbsp;
const Header = require('./header.js')
&nbsp;
const r = module.exports = (opt_, files, cb) =&gt; {
const opt = hlo(opt_)
&nbsp;
if (!opt.file)
throw new TypeError('file is required')
&nbsp;
if (opt.gzip)
throw new TypeError('cannot append to compressed archives')
&nbsp;
if (!files || !Array.isArray(files) || !files.length)
throw new TypeError('no files or directories specified')
&nbsp;
files = Array.from(files)
&nbsp;
return opt.sync ? replaceSync(opt, files)
: replace(opt, files, cb)
}
&nbsp;
const replaceSync = (opt, files) =&gt; {
const p = new Pack.Sync(opt)
&nbsp;
let threw = true
let fd
let position
&nbsp;
try {
try {
fd = fs.openSync(opt.file, 'r+')
} catch (er) {
if (er.code === 'ENOENT')
fd = fs.openSync(opt.file, 'w+')
else
throw er
}
&nbsp;
const st = fs.fstatSync(fd)
const headBuf = Buffer.alloc(512)
&nbsp;
POSITION: for (position = 0; position &lt; st.size; position += 512) {
for (let bufPos = 0, bytes = 0; bufPos &lt; 512; bufPos += bytes) {
bytes = fs.readSync(
fd, headBuf, bufPos, headBuf.length - bufPos, position + bufPos
)
&nbsp;
if (position === 0 &amp;&amp; headBuf[0] === 0x1f &amp;&amp; headBuf[1] === 0x8b)
throw new Error('cannot append to compressed archives')
&nbsp;
if (!bytes)
break POSITION
}
&nbsp;
let h = new Header(headBuf)
if (!h.cksumValid)
break
let entryBlockSize = 512 * Math.ceil(h.size / 512)
if (position + entryBlockSize + 512 &gt; st.size)
break
// the 512 for the header we just parsed will be added as well
// also jump ahead all the blocks for the body
position += entryBlockSize
if (opt.mtimeCache)
opt.mtimeCache.set(h.path, h.mtime)
}
threw = false
&nbsp;
streamSync(opt, p, position, fd, files)
} finally {
if (threw)
try { fs.closeSync(fd) } catch (er) {}
}
}
&nbsp;
const streamSync = (opt, p, position, fd, files) =&gt; {
const stream = new fsm.WriteStreamSync(opt.file, {
fd: fd,
start: position
})
p.pipe(stream)
addFilesSync(p, files)
}
&nbsp;
const replace = (opt, files, cb) =&gt; {
files = Array.from(files)
const p = new Pack(opt)
&nbsp;
const getPos = (fd, size, cb_) =&gt; {
const cb = (er, pos) =&gt; {
if (er)
fs.close(fd, _ =&gt; cb_(er))
else
cb_(null, pos)
}
&nbsp;
let position = 0
if (size === 0)
return cb(null, 0)
&nbsp;
let bufPos = 0
const headBuf = Buffer.alloc(512)
const onread = (er, bytes) =&gt; {
if (er)
return cb(er)
bufPos += bytes
if (bufPos &lt; 512 &amp;&amp; bytes)
return fs.read(
fd, headBuf, bufPos, headBuf.length - bufPos,
position + bufPos, onread
)
&nbsp;
if (position === 0 &amp;&amp; headBuf[0] === 0x1f &amp;&amp; headBuf[1] === 0x8b)
return cb(new Error('cannot append to compressed archives'))
&nbsp;
// truncated header
if (bufPos &lt; 512)
return cb(null, position)
&nbsp;
const h = new Header(headBuf)
if (!h.cksumValid)
return cb(null, position)
&nbsp;
const entryBlockSize = 512 * Math.ceil(h.size / 512)
if (position + entryBlockSize + 512 &gt; size)
return cb(null, position)
&nbsp;
position += entryBlockSize + 512
if (position &gt;= size)
return cb(null, position)
&nbsp;
if (opt.mtimeCache)
opt.mtimeCache.set(h.path, h.mtime)
bufPos = 0
fs.read(fd, headBuf, 0, 512, position, onread)
}
fs.read(fd, headBuf, 0, 512, position, onread)
}
&nbsp;
const promise = new Promise((resolve, reject) =&gt; {
p.on('error', reject)
let flag = 'r+'
const onopen = (er, fd) =&gt; {
if (er &amp;&amp; er.code === 'ENOENT' &amp;&amp; flag === 'r+') {
flag = 'w+'
return fs.open(opt.file, flag, onopen)
}
&nbsp;
if (er)
return reject(er)
&nbsp;
fs.fstat(fd, (er, st) =&gt; {
if (er)
return reject(er)
getPos(fd, st.size, (er, position) =&gt; {
if (er)
return reject(er)
const stream = new fsm.WriteStream(opt.file, {
fd: fd,
start: position
})
p.pipe(stream)
stream.on('error', reject)
stream.on('close', resolve)
addFilesAsync(p, files)
})
})
}
fs.open(opt.file, flag, onopen)
})
&nbsp;
return cb ? promise.then(cb, cb) : promise
}
&nbsp;
const addFilesSync = (p, files) =&gt; {
files.forEach(file =&gt; {
if (file.charAt(0) === '@')
t({
file: path.resolve(p.cwd, file.substr(1)),
sync: true,
noResume: true,
onentry: entry =&gt; p.add(entry)
})
else
p.add(file)
})
p.end()
}
&nbsp;
const addFilesAsync = (p, files) =&gt; {
while (files.length) {
const file = files.shift()
if (file.charAt(0) === '@')
return t({
file: path.resolve(p.cwd, file.substr(1)),
noResume: true,
onentry: entry =&gt; p.add(entry)
}).then(_ =&gt; addFilesAsync(p, files))
else
p.add(file)
}
p.end()
}
&nbsp;</pre></td></tr>
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