1 files changed, 248 insertions, 0 deletions
diff --git a/src/io/stream/xsltstream.cpp b/src/io/stream/xsltstream.cpp
new file mode 100644
index 0000000..882db30
--- /dev/null
+++ b/src/io/stream/xsltstream.cpp
@@ -0,0 +1,248 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * XSL Transforming input and output classes
+ *
+ * Authors:
+ *   Bob Jamison <ishmalius@gmail.com>
+ *
+ * Copyright (C) 2004-2008 Inkscape.org
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+
+#include "xsltstream.h"
+#include "stringstream.h"
+#include <libxslt/transform.h>
+
+
+
+
+namespace Inkscape
+{
+namespace IO
+{
+
+//#########################################################################
+//# X S L T    S T Y L E S H E E T
+//#########################################################################
+
+/**
+ *
+ */
+XsltStyleSheet::XsltStyleSheet(InputStream &xsltSource)
+              
+                   : stylesheet(nullptr)
+{
+    if (!read(xsltSource)) {
+        throw StreamException("read failed");
+        }
+}
+
+/**
+ *
+ */
+XsltStyleSheet::XsltStyleSheet()
+                    : stylesheet(nullptr)
+{
+}
+
+
+
+/**
+ *
+ */
+bool XsltStyleSheet::read(InputStream &xsltSource)
+{
+    StringOutputStream outs;
+    pipeStream(xsltSource, outs);
+    std::string strBuf = outs.getString().raw();
+    xmlDocPtr doc = xmlParseMemory(strBuf.c_str(), strBuf.size());
+    stylesheet = xsltParseStylesheetDoc(doc);
+    //following not necessary.  handled by xsltFreeStylesheet(stylesheet);
+    //xmlFreeDoc(doc);
+    if (!stylesheet)
+        return false;
+    return true;
+}
+
+
+/**
+ *
+ */ 
+XsltStyleSheet::~XsltStyleSheet()
+{
+    if (stylesheet)
+        xsltFreeStylesheet(stylesheet);
+}
+
+
+
+//#########################################################################
+//# X S L T    I N P U T    S T R E A M
+//#########################################################################
+
+
+/**
+ *
+ */ 
+XsltInputStream::XsltInputStream(InputStream &xmlSource, XsltStyleSheet &sheet)
+                        : BasicInputStream(xmlSource), stylesheet(sheet)
+{
+    //Load the data
+    StringOutputStream outs;
+    pipeStream(source, outs);
+    std::string strBuf = outs.getString().raw();
+    
+    //Do the processing
+    const char *params[1];
+    params[0] = nullptr;
+    xmlDocPtr srcDoc = xmlParseMemory(strBuf.c_str(), strBuf.size());
+    xmlDocPtr resDoc = xsltApplyStylesheet(stylesheet.stylesheet, srcDoc, params);
+    xmlDocDumpFormatMemory(resDoc, &outbuf, &outsize, 1);
+    outpos = 0;
+        
+    //Free our mem
+    xmlFreeDoc(resDoc);
+    xmlFreeDoc(srcDoc);
+}
+
+/**
+ *
+ */ 
+XsltInputStream::~XsltInputStream()
+{
+    xmlFree(outbuf);
+}
+
+/**
+ * Returns the number of bytes that can be read (or skipped over) from
+ * this input stream without blocking by the next caller of a method for
+ * this input stream.
+ */ 
+int XsltInputStream::available()
+{
+    return outsize - outpos;
+}
+
+    
+/**
+ *  Closes this input stream and releases any system resources
+ *  associated with the stream.
+ */ 
+void XsltInputStream::close()
+{
+    closed = true;
+}
+    
+/**
+ * Reads the next byte of data from the input stream.  -1 if EOF
+ */ 
+int XsltInputStream::get()
+{
+    if (closed)
+        return -1;
+    if (outpos >= outsize)
+        return -1;
+    int ch = (int) outbuf[outpos++];
+    return ch;
+}
+   
+
+
+
+
+
+//#########################################################################
+//#  X S L T     O U T P U T    S T R E A M
+//#########################################################################
+
+/**
+ *
+ */ 
+XsltOutputStream::XsltOutputStream(OutputStream &dest, XsltStyleSheet &sheet)
+                     : BasicOutputStream(dest), stylesheet(sheet)
+{
+    flushed = false;
+}
+
+/**
+ *
+ */ 
+XsltOutputStream::~XsltOutputStream()
+{
+    //do not automatically close
+}
+
+/**
+ * Closes this output stream and releases any system resources
+ * associated with this stream.
+ */ 
+void XsltOutputStream::close()
+{
+    flush();
+    destination.close();
+}
+    
+/**
+ *  Flushes this output stream and forces any buffered output
+ *  bytes to be written out.
+ */ 
+void XsltOutputStream::flush()
+{
+    if (flushed)
+        {
+        destination.flush();
+        return;
+        }
+        
+    //Do the processing
+    xmlChar *resbuf;
+    int resSize;
+    const char *params[1];
+    params[0] = nullptr;
+    xmlDocPtr srcDoc = xmlParseMemory(outbuf.raw().c_str(), outbuf.size());
+    xmlDocPtr resDoc = xsltApplyStylesheet(stylesheet.stylesheet, srcDoc, params);
+    xmlDocDumpFormatMemory(resDoc, &resbuf, &resSize, 1);
+    /*
+    xmlErrorPtr err = xmlGetLastError();
+    if (err)
+        {
+        throw StreamException(err->message);
+        }
+    */
+
+    for (int i=0 ; i<resSize ; i++)
+        {
+        char ch = resbuf[i];
+        destination.put(ch);
+        }
+        
+    //Free our mem
+    xmlFree(resbuf);
+    xmlFreeDoc(resDoc);
+    xmlFreeDoc(srcDoc);
+    destination.flush();
+    flushed = true;
+}
+    
+/**
+ * Writes the specified byte to this output stream.
+ */ 
+int XsltOutputStream::put(char ch)
+{
+    outbuf.push_back(ch);
+	return 1;
+}
+
+
+
+
+
+} // namespace IO
+} // namespace Inkscape
+
+
+//#########################################################################
+//# E N D    O F    F I L E
+//#########################################################################