Difference between revisions of "Binary Module"
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James Ball (talk  contribs) m (Correction bin:length was listed as bin:bin in the title.) 

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Revision as of 22:03, 22 August 2014
This XQuery Module contains functions to process binary data, including extracting subparts, searching, basic binary operations and conversion between binary and structured forms.
This module is based on the EXPath Binary Module.
Contents
Conventions
All functions and errors in this module are assigned to the http://expath.org/ns/binary
namespace, which is statically bound to the bin
prefix.
Constants and Conversions
bin:hex
Signatures  bin:hex($in as xs:string?) as xs:base64Binary?

Summary  Returns the binary form of the set of octets written as a sequence of (ASCII) hex digits ([09AFaf]).$in will be effectively zeropadded from the left to generate an integral number of octets, i.e. an even number of hexadecimal digits. If $in is an empty string, then the result will be an xs:base64Binary with no embedded data. Byte order in the result follows (peroctet) character order in the string. If the value of $in is the empty sequence, the function returns an empty sequence.

Errors  nonnumericcharacter : the input cannot be parsed as a hexadecimal number.

Examples  bin:hex('11223F4E') yields ESI/Tg== .xs:hexBinary(bin:hex('FF')) yields FF .

bin:bin
Signatures  bin:bin($in as xs:string?) as xs:base64Binary?

Summary  Returns the binary form of the set of octets written as a sequence of (8wise) (ASCII) binary digits ([01]).$in will be effectively zeropadded from the left to generate an integral number of octets. If $in is an empty string, then the result will be an xs:base64Binary with no embedded data. Byte order in the result follows (peroctet) character order in the string. If the value of $in is the empty sequence, the function returns an empty sequence.

Errors  nonnumericcharacter : the input cannot be parsed as a binary number.

Examples  bin:bin('1101000111010101') yields 0dU= .xs:hexBinary(bin:bin('1000111010101')) yields 11D5 .

bin:octal
Signatures  bin:octal($in as xs:string?) as xs:base64Binary?

Summary  Returns the binary form of the set of octets written as a sequence of (ASCII) octal digits ([07]).$in will be effectively zeropadded from the left to generate an integral number of octets. If $in is an empty string, then the result will be an xs:base64Binary with no embedded data. Byte order in the result follows (peroctet) character order in the string. If the value of $in is the empty sequence, the function returns an empty sequence.

Errors  nonnumericcharacter : the input cannot be parsed as an octal number.

Examples  xs:hexBinary(bin:octal('11223047')) yields 252627 .

bin:tooctets
Signatures  bin:tooctets($in as xs:base64Binary) as xs:integer*

Summary  Returns binary data as a sequence of octets. If $in is a zero length binary data then the empty sequence is returned. Octets are returned as integers from 0 to 255.

bin:fromoctets
Signatures  bin:fromoctets($in as xs:integer*) as xs:base64Binary

Summary  Converts a sequence of octets into binary data. Octets are integers from 0 to 255. If the value of $in is the empty sequence, the function returns zerosized binary data.

Errors  octetoutofrange : one of the octets lies outside the range 0  255.

Basic Operations
bin:length
Signatures  bin:length($in as xs:base64Binary) as xs:integer

Summary  Returns the size of binary data in octets. 
bin:part
Signatures  bin:part($in as xs:base64Binary?, $offset as xs:integer) as xs:base64Binary? bin:part($in as xs:base64Binary?, $offset as xs:integer, $size as xs:integer) as xs:base64Binary?

Summary  Returns a section of binary data starting at the $offset octet.If $size is specified, the size of the returned binary data is $size octets. If $size is absent, all remaining data from $offset is returned. The $offset is zero based. If the value of $in is the empty sequence, the function returns an empty sequence.

Errors  negativesize : the specified size is negative.indexoutofrange : the specified offset + size is out of range.

Examples  Test whether binary data starts with binary content consistent with a PDF file:bin:part($data, 0, 4) eq bin:hex("25504446") .

bin:join
Signatures  bin:join($in as xs:base64Binary*) as xs:base64Binary

Summary  Returns an xs:base64Binary created by concatenating the items in the sequence $in , in order. If the value of $in is the empty sequence, the function returns a binary item containing no data bytes.

bin:insertbefore
Signatures  bin:insertbefore($in as xs:base64Binary?, $offset as xs:integer, $extra as xs:base64Binary?) as xs:base64Binary?

Summary  Returns binary data consisting sequentially of the data from $in up to and including the $offset  1 octet, followed by all the data from $extra , and then the remaining data from $in .The $offset is zero based. If the value of $in is the empty sequence, the function returns an empty sequence.

Errors  indexoutofrange : the specified offset is out of range.

bin:padleft
Signatures  bin:padleft($in as xs:base64Binary?, $size as xs:integer) as xs:base64Binary? bin:padleft($in as xs:base64Binary?, $size as xs:integer, $octet as xs:integer) as xs:base64Binary?

Summary  Returns an xs:base64Binary created by padding the input with $size octets in front of the input. If $octet is specified, the padding octets each have that value, otherwise they are zero.If the value of $in is the empty sequence, the function returns an empty sequence.

Errors  negativesize : the specified size is negative.octetoutofrange : the specified octet lies outside the range 0255.

bin:padright
Signatures  bin:padright($in as xs:base64Binary?, $size as xs:integer) as xs:base64Binary? bin:padright($in as xs:base64Binary?, $size as xs:integer, $octet as xs:integer) as xs:base64Binary?

Summary  Returns an xs:base64Binary created by padding the input with $size octets after the input. If $octet is specified, the padding octets each have that value, otherwise they are zero.If the value of $in is the empty sequence, the function returns an empty sequence.

Errors  negativesize : the specified size is negative.octetoutofrange : the specified octet lies outside the range 0255.

bin:find
Signatures  bin:find($in as xs:base64Binary?, $offset as xs:integer, $search as xs:base64Binary) as xs:integer?

Summary  Returns the first location of the binary search sequence in the input, or if not found, the empty sequence. The $offset and the returned location are zero based. If the value of $in is the empty sequence, the function returns an empty sequence.

Errors  indexoutofrange : the specified offset + size is out of range.

Text Decoding and Encoding
bin:decodestring
Signatures  bin:decodestring($in as xs:base64Binary?, $encoding as xs:string) as xs:string? bin:decodestring($in as xs:base64Binary?, $encoding as xs:string, $offset as xs:integer) as xs:string? bin:decodestring($in as xs:base64Binary?, $encoding as xs:string, $offset as xs:integer, $size as xs:integer) as xs:string? 
Summary  Decodes binary data as a string in a given $encoding .If $offset and $size are provided, the $size octets from $offset are decoded. If $offset alone is provided, octets from $offset to the end are decoded.If the value of $in is the empty sequence, the function returns an empty sequence.

Errors  negativesize : the specified size is negative.indexoutofrange : the specified offset + size is out of range.unknownencoding : the specified encoding is unknown.conversionerror : an error or malformed input occurred during decoding the string.

Examples  Tests whether the binary data starts with binary content consistent with a PDF file:bin:decodestring($data, 'UTF8', 0, 4) eq '%PDF' .

bin:encodestring
Signatures  bin:encodestring($in as xs:string?, $encoding as xs:string) as xs:base64Binary?

Summary  Encodes a string into binary data using a given $encoding .If the value of $in is the empty sequence, the function returns an empty sequence.

Errors  unknownencoding : the specified encoding is unknown.conversionerror : an error or malformed input occurred during encoding the string.

Packing and Unpacking of Numeric Values
The functions have an optional parameter $octetorder whose string value controls the order: Leastsignificantfirst order is indicated by any of the values leastsignificantfirst
, littleendian
, or LE
. Mostsignificantfirst order is indicated by any of the values mostsignificantfirst
, bigendian
, or BE
.
bin:packdouble
Signatures  bin:packdouble($in as xs:double) as xs:base64Binary bin:packdouble($in as xs:double, $octetorder as xs:string) as xs:base64Binary

Summary  Returns the 8octet binary representation of a double value. Mostsignificantoctetfirst number representation is assumed unless the $octetorder parameter is specified.

Errors  unknownsignificanceorder : the specified octet order is unknown.

bin:packfloat
Signatures  bin:packfloat($in as xs:double) as xs:base64Binary bin:packfloat($in as xs:double, $octetorder as xs:string) as xs:base64Binary

Summary  Returns the 4octet binary representation of a float value. Mostsignificantoctetfirst number representation is assumed unless the $octetorder parameter is specified.

Errors  unknownsignificanceorder : the specified octet order is unknown.

bin:packinteger
Signatures  bin:packinteger($in as xs:double, $size as xs:integer) as xs:base64Binary bin:packfloat($in as xs:double, $size as xs:integer, $octetorder as xs:string) as xs:base64Binary

Summary  Returns the twoscomplement binary representation of an integer value treated as $size octets long. Any 'excess' highorder bits are discarded.Mostsignificantoctetfirst number representation is assumed unless the $octetorder parameter is specified. Specifying a $size of zero yields an empty binary data.

Errors  unknownsignificanceorder : the specified octet order is unknown.negativesize : the specified size is negative. 
bin:unpackdouble
Signatures  bin:unpackdouble($in as xs:base64Binary, $offset as xs:integer) as xs:double bin:unpackdouble($in as xs:base64Binary, $offset as xs:integer, $octetorder as xs:string) as xs:double

Summary  Extracts the double value stored at the particular offset in binary data. Mostsignificantoctetfirst number representation is assumed unless the $octetorder parameter is specified. The $offset is zero based.

Errors  indexoutofrange : the specified offset is out of range.unknownsignificanceorder : the specified octet order is unknown.

bin:unpackfloat
Signatures  bin:unpackfloat($in as xs:base64Binary, $offset as xs:integer) as xs:double bin:unpackfloat($in as xs:base64Binary, $offset as xs:integer, $octetorder as xs:string) as xs:float

Summary  Extracts the float value stored at the particular offset in binary data. Mostsignificantoctetfirst number representation is assumed unless the $octetorder parameter is specified. The $offset is zero based.

Errors  indexoutofrange : the specified offset + size is out of range.unknownsignificanceorder : the specified octet order is unknown.

bin:unpackinteger
Signatures  bin:unpackinteger($in as xs:base64Binary, $offset as xs:integer, $size as xs:integer) as xs:double bin:unpackinteger($in as xs:base64Binary, $offset as xs:integer, $size as xs:integer, $octetorder as xs:string) as xs:float

Summary  Returns a signed integer value represented by the $size octets starting from $offset in the input binary representation. Necessary sign extension is performed (i.e. the result is negative if the high order bit is '1').Mostsignificantoctetfirst number representation is assumed unless the $octetorder parameter is specified. The $offset is zero based. Specifying a $size of zero yields the integer 0 .

Errors  negativesize : the specified size is negative.indexoutofrange : the specified offset + size is out of range.unknownsignificanceorder : the specified octet order is unknown.

bin:unpackunsignedinteger
Signatures  bin:unpackunsignedinteger($in as xs:base64Binary, $offset as xs:integer, $size as xs:integer) as xs:double bin:unpackunsignedinteger($in as xs:base64Binary, $offset as xs:integer, $size as xs:integer, $octetorder as xs:string) as xs:float

Summary  Returns an unsigned integer value represented by the $size octets starting from $offset in the input binary representation.Mostsignificantoctetfirst number representation is assumed unless the $octetorder parameter is specified. The $offset is zero based. Specifying a $size of zero yields the integer 0 .

Errors  negativesize : the specified size is negative.indexoutofrange : the specified offset + size is out of range.unknownsignificanceorder : the specified octet order is unknown.

Bitwise Operations
bin:or
Signatures  bin:or($a as xs:base64Binary?, $b as xs:base64Binary?) as xs:base64Binary?

Summary  Returns the "bitwise or" of two binary arguments. If either argument is the empty sequence, an empty sequence is returned. 
Errors  differinglengtharguments : the input arguments are of differing length.

bin:xor
Signatures  bin:xor($a as xs:base64Binary?, $b as xs:base64Binary?) as xs:base64Binary?

Summary  Returns the "bitwise xor" of two binary arguments. If either argument is the empty sequence, an empty sequence is returned. 
Errors  differinglengtharguments : the input arguments are of differing length.

bin:and
Signatures  bin:and($a as xs:base64Binary?, $b as xs:base64Binary?) as xs:base64Binary?

Summary  Returns the "bitwise and" of two binary arguments. If either argument is the empty sequence, an empty sequence is returned. 
Errors  differinglengtharguments : the input arguments are of differing length.

bin:not
Signatures  bin:not($in as xs:base64Binary?) as xs:base64Binary?

Summary  Returns the "bitwise not" of a binary argument. If the argument is the empty sequence, an empty sequence is returned. 
bin:shift
Signatures  bin:shift($in as xs:base64Binary?, $by as xs:integer) as xs:base64Binary?

Summary  Shifts bits in binary data. If $by is zero, the result is identical to $in . If $by is positive then bits are shifted to the left. Otherwise, bits are shifted to the right. If the absolute value of $by is greater than the bitlength of $in then an allzeros result is returned. The result always has the same size as $in . The shifting is logical: zeros are placed into discarded bits. If the value of $in is the empty sequence, the function returns an empty sequence.

Errors
Code  Description 

differinglengtharguments

The arguments to a bitwise operation have different lengths. 
indexoutofrange

An offset value is out of range. 
negativesize

A size value is negative. 
octetoutofrange

An octet value lies outside the range 0255. 
nonnumericcharacter

Binary data cannot be parsed as number. 
unknownencoding

An encoding is not supported. 
conversionerror

An error or malformed input during converting a string. 
unknownsignificanceorder

An octetorder value is unknown. 
Changelog
Introduced with Version 7.8.