* @lenp: On entry, length data at @src. On exit, number of bytes used from @src
* @stoponerr: 0 to continue when a decode error is found, 1 to stop
* @offset: start offset within the src buffer
* @lenp: On entry, length data at @src. On exit, number of bytes used from @src
* @stoponerr: 0 to continue when a decode error is found, 1 to stop
* @offset: start offset within the src buffer