Hello XSLT experts!
My input file consists of a sequence (sourceSeq) of <Byte> elements
representing a sequence of null-terminated strings. I want to create a function
that returns a sequence of <String> elements. For example, with this sourceSeq:
<Byte>48</Byte>
<Byte>69</Byte>
<Byte>00</Byte>
<Byte>4A</Byte>
<Byte>69</Byte>
<Byte>6C</Byte>
<Byte>6C</Byte>
<Byte>00</Byte>
the function should return:
<String>Hi</String>
<String>Jill</String>
The strings are of variable length.
I do not know how many null-terminated strings are in sourceSeq. However, I do
know the total number (total-size) of <Byte> elements within sourceSeq
containing the null-terminated strings.
Below is a recursive way to implement the function. Unfortunately, total-size
can be quite large, which means the function recurses many times, resulting in
a "Too many nested function calls" error. Is there an iterative way to
implement the function? /Roger
<xsl:function name="f:make-string-table-entries" as="element(String)*">
<xsl:param name="total-size" as="xs:integer" />
<xsl:param name="current-size" as="xs:integer" />
<xsl:param name="current-position" as="xs:integer" />
<xsl:param name="sourceSeq" as="element(Byte)*" />
<xsl:choose>
<xsl:when test="$current-size ge $total-size" />
<xsl:otherwise>
<xsl:variable name="string"
select="f:make-element-from-null-terminated-string('String', $current-position,
$sourceSeq)" as="element(String)"/>
<xsl:sequence select="$string" />
<xsl:variable name="length" select="string-length($string/text()) +
1"/> <!-- add 1 for the null byte -->
<xsl:sequence select="f:make-string-table-entries($total-size,
xs:integer($current-size+$length), xs:integer($current-position+$length),
$sourceSeq)" />
</xsl:otherwise>
</xsl:choose>
</xsl:function>
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