2017. november 9., csütörtök 14:11:13 UTC+1 időpontban Luis Furquim a következőt írta: > > Hello Gophers! > > I am trying to open a chrome extension file to read its manifest.json. It > is a zip file with a .crx extension. When I unzip via command line it works > like a charm. But, if I try with golang using package archive/zip it gives > me the "zip: not a valid zip file" error. It's not the first time I use > this package and it always worked fine, including working with Libre Office > documents (.odt). I checked with the "file" command and with "od -c | head" > commands and realized that the Chrome Extensions files differ in the magic > bytes: > > The regular zip file: > vuco@azrael ~/Documents $ od -c ./root/prms-minuano.zip | head -n 1 > 0000000 P K 003 004 024 \0 \0 \0 \b \0 016 210 0 @ 034 255 vuco@azrael > ~/Documents $ file ./root/prms-minuano.zip ./root/prms-minuano.zip: Zip > archive data, at least v2.0 to extract > > > The odt file: > vuco@azrael ~/Documents $ od -c ./mpf/v1.ProjetoIntegracao.odt | head -n 1 > 0000000 P K 003 004 024 \0 \0 \b \0 \0 256 y 026 ? ^ 306 vuco@azrael > ~/Documents $ file ./mpf/v1.ProjetoIntegracao.odt > ./mpf/v1.ProjetoIntegracao.odt: OpenDocument Text > > > The crx file: > sherlock@asspadev ~/work/download $ od -c lestrade.crx | head -n 1 > 0000000 C r 2 4 002 \0 \0 \0 & 001 \0 \0 \0 001 \0 \0 > sherlock@asspadev ~/work/download $ file lestrade.crx lestrade.crx: data > > > Any suggestions on how to open the file? > > Thank you in advance > Luis Otavio de Colla Furquim > > As "CRX files are ZIP files with a special header and the .crx file extension. ", and ZIP has a "PK\x05\x06" magic sequence, a working solution is to read all the bytes of the .crx into a []byte, change the "Cr24" to "PK\x05\x06", then use a bytes.NewBuffer(b) as a ReaderAt.
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