How to unzip a big zip file containing one file and get the progress in bytes with swift?

Question

I try to unzip a big zip file containing only one item (more than 100MB) and like to show the progress during unzipping.

I found solutions where the progress can be

Answer 1

To achieve what you want, you will have to modify SSZipArchive's internal code.

SSZipArchive uses minizip to provide the zipping functionality. You can see the minizip unzipping API here: unzip.h.

In SSZipArchive.m, you can get the uncompressed size of the file being unzipped from the fileInfo variable.

You can see that the unzipped contents are being read here:

 FILE *fp = fopen((const char*)[fullPath UTF8String], "wb");
 while (fp) {
     int readBytes = unzReadCurrentFile(zip, buffer, 4096);
     if (readBytes > 0) {
         fwrite(buffer, readBytes, 1, fp );
     } else {
         break;
     }
 }

You will need the readBytes and the uncompressed file size to compute the progress for a single file. You can add a new delegate to SSZipArchive to send these data back to the calling code.