21.3. Binary Input and Output

21.3.1. Binary input, READ-BYTE, EXT:READ-INTEGER & EXT:READ-FLOAT
21.3.2. Binary output, WRITE-BYTE, EXT:WRITE-INTEGER & EXT:WRITE-FLOAT

21.3.1. Binary input, READ-BYTE, EXT:READ-INTEGER & EXT:READ-FLOAT

The function (EXT:READ-INTEGER stream element-type &OPTIONAL ENDIANNESS eof-error-p eof-value) reads a multi-byte INTEGER from stream, which should be a STREAM with STREAM-ELEMENT-TYPE (UNSIGNED-BYTE 8). element-type should be type equivalent to (UNSIGNED-BYTE n), where n is a multiple of 8.

(EXT:READ-INTEGER stream element-type) is like (READ-BYTE stream) if stream's STREAM-ELEMENT-TYPE were set to element-type, except that stream's FILE-POSITION will increase by n/8 instead of 1.

Together with (SETF STREAM-ELEMENT-TYPE), this function permits mixed character/binary input from a stream.

The function (EXT:READ-FLOAT stream element-type &OPTIONAL ENDIANNESS eof-error-p eof-value) reads a floating-point number in IEEE 754 binary representation from stream, which should be a STREAM with STREAM-ELEMENT-TYPE (UNSIGNED-BYTE 8). element-type should be type equivalent to SINGLE-FLOAT or DOUBLE-FLOAT.

Endianness. ENDIANNESS can be :LITTLE or :BIG. The default is :LITTLE, which corresponds to the READ-BYTE behavior in CLISP.

21.3.2. Binary output, WRITE-BYTE, EXT:WRITE-INTEGER & EXT:WRITE-FLOAT

The function (EXT:WRITE-INTEGER integer stream element-type &OPTIONAL ENDIANNESS) writes a multi-byte INTEGER to stream, which should be a STREAM with STREAM-ELEMENT-TYPE (UNSIGNED-BYTE 8). element-type should be type equivalent to (UNSIGNED-BYTE n), where n is a multiple of 8.

(EXT:WRITE-INTEGER integer stream element-type) is like (WRITE-BYTE integer stream) if stream's STREAM-ELEMENT-TYPE were set to element-type, except that stream's FILE-POSITION will increase by n/8 instead of 1.

Together with (SETF STREAM-ELEMENT-TYPE), this function permits mixed character/binary output to a STREAM.

The function (EXT:WRITE-FLOAT float stream element-type &OPTIONAL ENDIANNESS) writes a floating-point number in IEEE 754 binary representation to stream, which should be a STREAM with STREAM-ELEMENT-TYPE (UNSIGNED-BYTE 8). element-type should be type equivalent to SINGLE-FLOAT or DOUBLE-FLOAT.


These notes document CLISP version 2.49+Last modified: 2016-09-05