How to let users read p7m files online

i'm running a php/mysql based website. I alr开发者_如何转开发eady let my users upload p7m files (most of them are pdf digital signed). Is there a solution to let users watch them on site (online) directly without download them? Like google does with pdf, or rtf files?

Thank you

S.

If these files are just MIME blobs, then extract the main part and display it (for text/plain or /html content). Any existing file signature has no impact for displaying.

Regarding the embeddable PDF viewing, this is probably a sufficient option: http://googlesystem.blogspot.com/2009/09/embeddable-google-document-viewer.html