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Source for wiki BinaryIoCowan version 3

author

cowan

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ipnr

127.11.51.1

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BinaryIoCowan

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== Input and output ==

The default value of ''port'' is the current input or output port, as appropriate.  It is an error if the ports passed to these procedures are not binary ports.  The [type] values are defined in BytevectorsCowan.

`(read-[type] ` [ ''port'' ]`)`

Reads the appropriate number of bytes from ''port'' in native byte order and returns a number of the appropriate type (exact integer or inexact real or complex number).

`(read-[type]le ` [ ''port'' ]`)`

Reads the appropriate number of bytes from ''port'' in little-endian byte order and returns a number of the appropriate type (exact integer or inexact real or complex number).

`(read-[type]be ` [ ''port'' ]`)`

Reads the appropriate number of bytes from ''port'' in big-endian ("network") byte order and returns a number of the appropriate type (exact integer or inexact real or complex number).

`(write-[type] `''number'' [ ''port'' ]`)`

Writes ''number'' to ''port'' in the appropriate format using native byte order.

`(write-[type]le `''number'' [ ''port'' ]`)`

Writes ''number'' to ''port'' in the appropriate format using little-endian byte order.

`(write-[type]be `''number'' [ ''port'' ]`)`

Writes ''number'' to ''port'' in the appropriate format using big-endian ("network") byte order.

`(read-ber-integer ` [ ''port'' ]`)`

Reads a [https://en.wikipedia.org/wiki/X.690#BER_encoding BER]-encoded integer of arbitrary size from ''port'' and returns it as an exact integer.

`(write-ber-integer ` ''exact-integer'' [ ''port'' ]`)`

Writes ''exact-integer'' using [https://en.wikipedia.org/wiki/X.690#BER_encoding BER] encoding to ''port''.

`(read-utf8-string ` ''k'' [ ''port'' ]`)`

`(read-utf16-le-string ` ''k'' [ ''port'' ]`)`

`(read-utf16-be-string ` ''k'' [ ''port'' ]`)`

Read ''k'' bytes from ''port'', interpreting them as a sequence of characters encoded in UTF-8, UTF-16LE, or UTF-16BE, and return the sequence as a string.  It is an error if the implementation forbids any of the characters in strings, except that if the implementation forbids null characters in strings and the final character is a null, then it is discarded.

`(write-utf8-string ` ''string'' [ ''port'' ]`)`

`(write-utf16-le-string ` ''string'' [ ''port'' ]`)`

`(write-utf16-be-string ` ''string' [ ''port'' ]`)`

Convert the characters of ''string'' to UTF-8, UTF-16LE, or UTF-16BE, and write the bytes to ''port''.  It is an error if the implementation forbids any of the characters in strings.

`(read-utf8-string-until `''byte'' [ ''port'' ]`)`

Read bytes from ''port'' until a byte equal to ''byte'' is read.  Interpret all the other bytes as a sequence of characters encoded in UTF-8, and return two values, the character sequence as a string and the terminating byte as a character.

== Implementation ==

See [http://srfi.schemers.org/srfi-56/srfi-56.html SRFI 56] for implementation.

time

2017-08-09 08:55:07