On 05/17/2017 12:00 AM, John Ferlan wrote:
>
>
> On 05/16/2017 10:03 AM, Michal Privoznik wrote:
>> This is just an internal API, that calls corresponding function
>> in stream driver. This function will set @data=1 if the
>> underlying file is in data section, or @data=0 if it is in a
>> hole. At any rate, @length is set to number of bytes remaining in
>> the section the file currently is.
>>
>> Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
>> ---
>> src/driver-stream.h | 6 ++++++
>> src/libvirt-stream.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
>> src/libvirt_internal.h | 4 ++++
>> src/libvirt_private.syms | 1 +
>> 4 files changed, 59 insertions(+)
>>
>
> [...]
>
>> diff --git a/src/libvirt-stream.c b/src/libvirt-stream.c
>> index 4cbe5eee1..30c305035 100644
>> --- a/src/libvirt-stream.c
>> +++ b/src/libvirt-stream.c
>> @@ -481,6 +481,54 @@ virStreamRecvHole(virStreamPtr stream,
>> }
>>
>>
>> +/**
>> + * virStreamInData:
>> + * @stream: stream
>> + * @data: are we in data or hole
>> + * @length: length to next section
>> + *
>> + * This function checks the underlying stream (typically a file)
>> + * to learn whether the current stream position lies within a
>> + * data section or a hole. Upon return @data is set to a nonzero
>> + * value if former is the case, or to zero if @stream is in a
>> + * hole. Moreover, @length is updated to tell caller how many
>> + * bytes can be read from @stream until current section changes
>> + * (from data to a hole or vice versa).
>> + *
>> + * NB: there's an implicit hole at EOF. In this situation this
>> + * function should set @data = false, @length = 0 and return 0.
>> + *
>> + * To sum it up:
>> + *
>> + * data section: @data = true, @length > 0
>> + * hole: @data = false, @length > 0
>> + * EOF: @data = false, @length = 0
>> + *
>> + * Returns 0 on success,
>> + * -1 otherwise
>> + */
>> +int
>> +virStreamInData(virStreamPtr stream,
>> + int *data,
>> + long long *length)
>> +{
>> + VIR_DEBUG("stream=%p, data=%p, length=%p", stream, data, length);
>> +
>> + /* No checks of arguments or error resetting. This is an
>> + * internal function that just happen to live next to some
>> + * public functions of ours. */
>
> Well... If it's publicly accessible... @data and @length should probably
> be checked for non NULL.
It's not publicly accessible. It's private. But sure, checks would be
harmless. I can add them.
Michal
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