extend file_handler to support reads

Problem: the upcomming version handler will need to read from files.
Currently file hander (image handler) does not support reads.

Solution:

extend file_handler to support reads

Problem: the upcomming version handler will need to read from files.
Currently file hander (image handler) does not support reads.

Solution: Add read support by providing an optional mode parameter.

Tests added:
FileHanderTest added to
- Test out open for reads
- Test out reading out bytes and verifying size and content
- Test out trying to read beyond EOF
- Test out offset reads that go beyond EOF

Tested:
Existing unit tests pass
New unit tests for reading all pass

Signed-off-by: Jason Ling <jasonling@google.com>
Change-Id: Ie416a6b4b452d8d04fa158bd55989d07a891896f

show more ...

move files around to create a common convenience library

Problem: plan is to add another blob handler into ipmi-flash
(ipmi-flash-version). This new handler will re-use much of the
i

move files around to create a common convenience library

Problem: plan is to add another blob handler into ipmi-flash
(ipmi-flash-version). This new handler will re-use much of the
ipmi-flash (firmware-handler) code. The common code should be presented
as a convenience library to reduce code duplication.

Solution: move anticipated firmware-handler specific code into the
subdirectory bmc/firmware-handler and leave common code in bmc/.

The end goal is to have version-handler re-use as
much code as possible.

Tested:
rebuilt everything and ran unit tests.

Signed-off-by: Jason Ling <jasonling@google.com>
Change-Id: I2128da629b0ddf27b89f1faee358d1941f1dff38

show more ...