I am converting docx to epub using pandoc. After converting epub, i do changes with zip file and converting epub also. At that time,
I got the following issue after converting zip file to epub on mimetype file.
Mimetype contains wrong type (application/epub+zip expected).
I am searching a lot and get two logic
First one e.g., extra spaces, new line characters but it was going vain(there is no extra spaces, new line).
Add the mimetype file without compression in zip.
I am getting struck with second point. How to add mimetype file without compression in zip using node.js coding.
var archiver = require('archiver');
var archive = archiver('zip');
archive.file('d:\\xxxx'+'\\mimetype', { name:'mimetype'});
What is the problem in the above code and any attribute for zip?
Can any one assist me for adding file without compression in zip?
Thanks in advance.
add the zip option {store:true} for without compression
https://www.npmjs.com/package/archiver#store-boolean
Related
I have an api in which I generate an XLSX file with some data, and then transform it to base64 and return it to the client.
I'm having trouble transforming the XLSX to Base64, the function returns the string in base64, but when I check it with tools like base64guru or similar, it is converted to a zip file and the XLSX is completely lost.
I'm using the typical method to convert to base64, I don't have anything strange, it just transforms it into a zip and I don't know why.
Here is the parser code:
const path = `./some_path/${randomName}.xlsx`;
XLSX.writeFile(workbook, path); //<<-- the file is generated and i can open it with excel and works
fine.
const base64String = fs.readFileSync(path).toString('base64'); //this return the base64 zip file :S
Does anyone know why this happens and how can I solve it?
Here i put a base64 generated string:
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
There is nothing wrong here. You can rename the decoded Base64 file to .xlsx and open it with Excel.
XLSX is in fact a zip-file with a certain structure inside.
Office Open XML (also informally known as OOXML or Microsoft Open XML (MOX))[3] is a zipped, XML-based file format developed by Microsoft for representing spreadsheets, charts, presentations and word processing documents
(Source: https://en.wikipedia.org/wiki/Office_Open_XML)
The base64 website did it's best to identify the file format and found the first 4 bytes
50 4b 03 04 ("PK��")
which identifies it as a ZIP file.(originally PKZIP, starting with the initials of the creator)
If you keep the .zip extension, you can open it with any unzip tool or directly in the Windows Explorer to see the internal structure of it.
With a few lines JavaScript you can identify the OpenXML content type of the OpenXML/ZIP file:
var base64input = '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'
var buf = Buffer.from(base64input, 'base64');
console.log(buf)
const header = buf.toString()
if (header.indexOf(" ContentType=\"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml\"") > 0)
console.log("Excel XSLX")
else if (header.indexOf(" ContentType=\"application/vnd.openxmlformats-officedocument.wordprocessingml.document.main+xml\"") > 0)
console.log("Word DOCX")
else if (header.indexOf("ContentType=\"application/vnd.openxmlformats-officedocument.presentationml.presentation.main+xml\"") > 0)
console.log("PowerPoint PPTX")
I can't guarantee that it will allways work. With the example from the question it works, but with a DOCX file on my PC it didn't. I'll update this answer as soon as I know more.
I am using https://www.npmjs.com/package/xlsx library to create CSV.
This is the final code to write CSV code
let workbook: WorkBook = this.workBookCreator.getWorkbook(workBookName);
return this.xlsxModule.write(workbook, {
bookType: format,
type: "buffer"
});
And that will be uploaded to S3 bucket.
To download file
window.location.href = fileLocation;
Where fileLocation is the S3 pre-signed URL with a GET request.
When the downloaded file opens in Microsoft Excel, Special characters are messed up due to UTF-8 charset are not being recognized by EXCEL.
Can anyone please help me, how can I set charset UTF-8 while creating CSV to support all special characters to Excel?
I have tried the below solutions so far:
Tried to change the buffer type of XLSX
Added IconV & IconV-lite for buffer conversion
Changed the Content-type of the S3 bucket file.
Tried to change buffer type to string
I know we can prepend BOM to CSV file while writing. But couldn't find from where I can prepend.
So, Finally, I found the solution (Tried too many google search)
I used iconv-lite npm package
And here is code:
const txt = '\uFEFF'+ iconV.decode(CSVString, 'utf8');
CSVString = iconV.encode(txt, 'utf8');
Hope, I can save someone's day!
I want to open a binary file, or at least when I try to open this with the vscode editor, is say that, can't be opened, because is a binary file.
Can someone explain to me what I can do in order to open this type of files and read the content?
About the .nii file format. is a NIFTI1 and used on medical visualization like MRI.
What I trying to do is to read this file at the lowest level and then make some computations.
I will like to use Node.js for this, not any Python or C++.
More details about the file format can be found here.
https://nifti.nimh.nih.gov/
I don't know about how VScode handle binary file but for exemple with Atom (or with another text editor like vi), you can open and view the content of a binary file. This is not very usefull however as the content is not particularly human readable, except maybe some metadata at the top of the file.
$ vim yourniifile.nii
Anyway, it's all depends on what you want to do with that file, which "computation" you're planned to apply to it, and how you will use it after that.
Luckily, there are some npm packages that can help you with the task of reading and processing that kind of file, like nifti-reader-js or nifti-js, for exemple:
const fs = require('fs');
const niftijs = require('nifti-js');
let rawData = fs.readFileSync('yourniifile.nii');
let data = niftijs.parse(rawData);
console.log(data);
This could be a basic question, but wanted to understand why the size of the file being read using fs.readFileSync is incorrect if the source is referring to an 'image' or non-text file path.
Example:
fs.writeFileSync(outputPath, fs.readFileSync(source, 'utf8'));
Because you are calling fs.readFileSync(source, 'utf8').
The important part is utf8, you are telling it to decode the file as if it is utf8 text. If it is a non-text file then it will not work properly and thus produce the incorrect file size.
I am requesting a zip file from an API and I'm trying to retrieve it by bytes range (setting a Range header) and then parsing each of the parts individually. After reading some about gzip and zip compression, I'm having a hard time figuring out:
Can I parse a portion out of a zip file?
I know that gzip files usually compresses a single file so you can decompress and parse it in parts, but what about zip files?
I am using node-js and tried several libraries like adm-zip or zlib but it doesn't look like they allow this kind of possibility.
Zip files have a catalog at the end of the file (in addition to the same basic information before each item), which lists the file names and the location in the zip file of each item. Generally each item is compressed using deflate, which is the same algorithm that gzip uses (but gzip has a custom header before the deflate stream).
So yes, it's entirely feasible to extract the compressed byte stream for one item in a zip file, and prepend a fabricated gzip header (IIRC 14 bytes is the minimum size of this header) to allow you to decompress just that file by passing it to gunzip.
If you want to write code to inflate the deflated stream yourself, I recommend you make a different plan. I've done it, and it's really not fun. Use zlib if you must do it, don't try to reimplement the decompression.