Thank you for the directions! But this was just the first bit of the problem... I changed locally the archive/zip sources, making it accept both magic sequences on fileHeaderSignature and directoryHeaderSignature. Then I ran in UnexpectedEOF trap! I think that there is some version/flavor of the zip format that is just unsupported by the archive/zip package (but is supported by the zip command line). I am using Go1.8.3, I will try to upgrade to current (1.9.2) version. The release notes mention the zip package but only for the Writer type. Anyway I should upgrade sooner or later...
Cheers Em quinta-feira, 9 de novembro de 2017 11:39:24 UTC-2, Tamás Gulácsi escreveu: > > > 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. > > The problem is that this signature is in every block. > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
