8.12
1 Bytes
| (require binaryio/bytes) | package: binaryio-lib |
procedure
(read-bytes* len [in]) → bytes?
len : exact-nonnegative-integer? in : input-port? = (current-input-port)
Like read-bytes, but returns a byte string of exactly
len bytes. If fewer than len bytes are available
before the end of input, an exception is raised.
Examples:
> (define in (open-input-bytes #"abcde")) > (read-bytes* 4 in) #"abcd"
> (read-bytes* 2 in) read-bytes*: unexpected end of input
tried to read: 2 bytes
available: 1 bytes
received: #"e"
procedure
(write-null-terminated-bytes bstr [ out start end]) → void? bstr : bytes? out : output-port? = (current-output-port) start : exact-nonnegative-integer? = 0 end : exact-nonnegative-integer? = (bytes-length bstr)
Writes bytes to out from bstr from index
start (inclusive) to end (exclusive), and then
writes a null (0) byte terminator.
If bstr contains any null bytes between start and end, an error is raised.
procedure
(read-null-terminated-bytes [in]) → bytes?
in : input-port? = (current-input-port)
Reads from in until a null (0) byte is found, then returns
the bytes read, excluding the null terminator. If no null
terminator is found before the end of input, an error is raised.
Examples:
> (define-values (in out) (make-pipe)) > (write-null-terminated-bytes #"abcde" out) > (read-null-terminated-bytes in) #"abcde"