Function

FwupdPluginxor8_safe

since: 2.1.1

Declaration [src]

gboolean
fu_xor8_safe (
  const guint8* buf,
  gsize bufsz,
  gsize offset,
  gsize n,
  guint8* value,
  GError** error
)

Description [src]

Returns the bitwise XOR of all bytes in buf in a safe way.

You don’t need to use this function in “obviously correct” cases, nor should you use it when performance is a concern. Only use it when you’re not sure if malicious data from a device or firmware could cause memory corruption.

Available since: 2.1.1

Parameters

buf

Type: const guint8*

Source buffer.

The data is owned by the caller of the function.

bufsz

Type: gsize

Maximum size of buf, typically sizeof(buf).

offset

Type: gsize

Offset in bytes into buf where XOR should start.

n

Type: gsize

Number of bytes to XOR from buf.

value

Type: guint8*

The initial value, and result.

The argument will be modified by the function.

The argument can be set to NULL by the function.

error

Type: GError **

The return location for a recoverable error.

The argument can be NULL.

If the return location is not NULL, then you must initialize it to a NULL GError*.

The argument will be left initialized to NULL by the function if there are no errors.

In case of error, the argument will be set to a newly allocated GError; the caller will take ownership of the data, and be responsible for freeing it.

Return value

Type: gboolean

TRUE if value was set, FALSE otherwise.