On Wed, Nov 21, 2018 at 05:18:38PM +0200, Jarkko Sakkinen wrote: > On Wed, Nov 21, 2018 at 06:50:37AM -0800, Tadeusz Struk wrote: > > Currently to read a response from the TPM device an application needs > > provide big enough buffer for the whole response and read it in one go. > > The application doesn't know how big the response it beforehand so it > > always needs to maintain a 4K buffer and read the max (4K). > > In case if the user of the TSS library doesn't provide big enough > > buffer the TCTI spec says that the library should set the required > > size and return TSS2_TCTI_RC_INSUFFICIENT_BUFFER error code so that the > > application could allocate a bigger buffer and call receive again. > > To make it possible in the TSS library, this requires being able to do > > partial reads from the driver. > > The library would read the 10 bytes header first to get the actual size > > of the response from the header, and then read the rest of the response. > > > > This patch adds support for partial reads, i.e. the user can read the > > response in one or multiple reads, until the whole response is consumed. > > The user can also read only part of the response and ignore > > the rest by issuing a new write to send a new command. > > > > Signed-off-by: Tadeusz Struk <tadeusz.struk@xxxxxxxxx> > > Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx> Tested-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx> Pushed. /Jarkko
