Method
GLibBytesget_region
since: 2.70
Declaration
gconstpointer
g_bytes_get_region (
GBytes* bytes,
gsize element_size,
gsize offset,
gsize n_elements
)
Description
Gets a pointer to a region in bytes.
The region starts at offset many bytes from the start of the data
and contains n_elements many elements of element_size size.
n_elements may be zero, but element_size must always be non-zero.
Ideally, element_size is a static constant (eg: sizeof a struct).
This function does careful bounds checking (including checking for
arithmetic overflows) and returns a non-NULL pointer if the
specified region lies entirely within the bytes. If the region is
in some way out of range, or if an overflow has occurred, then NULL
is returned.
Note: it is possible to have a valid zero-size region. In this case,
the returned pointer will be equal to the base pointer of the data of
bytes, plus offset. This will be non-NULL except for the case
where bytes itself was a zero-sized region. Since it is unlikely
that you will be using this function to check for a zero-sized region
in a zero-sized bytes, NULL effectively always means “error”.
Available since: 2.70