partialzip

Partial Implementation of PartialZip in Go

Why?

If you need to download a VERY large zip, but you only need some small file from it, this is a nice optimization to allow you to only extract what you need and nothing else. Saving time, bandwidth and space.

Install

go get github.com/blacktop/partialzip

Example

import (
    "fmt"
    "log"

    "github.com/blacktop/partialzip"
)

func main() {
    pzip, err := partialzip.New("https://apple.com/ipsw/download/link")
    if err != nil {
        log.Fatal(err)
    }

    fmt.Println(pzip.List())

    n, err := pzip.Download("kernelcache.release.iphone11")
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("extracting kernelcache.release.iphone11, wrote %d bytes\n", n)
}

extracting "kernelcache.release.iphone11", wrote 17842148 bytes

CLI

Install

Download punzip from releases

Usage

List zipped files

$ punzip list http://updates-http.cdn-apple.com/download/ipsw

NAME                                                         |SIZE
Firmware/                                                    |0 B
...SNIP...
kernelcache.release.iphone11                                 |18 MB
Firmware/all_flash/LLB.d321.RELEASE.im4p.plist               |331 B
048-16246-211.dmg                                            |107 MB
048-15811-213.dmg                                            |106 MB
Firmware/ICE18-1.00.08.Release.bbfw                          |39 MB

Download a file from the remote zip

$ punzip get --path kernelcache.release.iphone11 http://updates-http.cdn-apple.com/download/ipsw

Successfully downloaded "kernelcache.release.iphone11"

Credits

• planetbeing/partial-zip (written in C)
• marcograss/partialzip (written in Rust)

License

MIT Copyright (c) 2018 blacktop