[librsvg] Add rsvg-xml.[ch]

[Christian Persch <chpe src gnome org>]

commit 9aa2584d2bc8cae32e90f50e4d10e7126e70751b
Author: Christian Persch <chpe gnome org>
Date:   Tue Jun 22 16:03:39 2010 +0200

    Add rsvg-xml.[ch]
    
    Forgot to git add these. Part of bug #621699.

 rsvg-xml.c |   96 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 rsvg-xml.h |   35 ++++++++++++++++++++++
 2 files changed, 131 insertions(+), 0 deletions(-)
---
diff --git a/rsvg-xml.c b/rsvg-xml.c
new file mode 100644
index 0000000..31f7ef0
--- /dev/null
+++ b/rsvg-xml.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright © 2010 Christian Persch
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of the
+ * License, or (at your option) any later version.
+  
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+  
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+*/
+
+#include "config.h"
+
+#include "rsvg-xml.h"
+
+typedef struct {
+    GInputStream *stream;
+    GCancellable *cancellable;
+    GError      **error;
+} RsvgXmlInputStreamContext;
+
+/* this should use gsize, but libxml2 is borked */
+static int
+context_read (RsvgXmlInputStreamContext *context,
+              char *buffer,
+              int   len)
+{
+    gssize n_read;
+
+    if (*(context->error))
+        return -1;
+
+    n_read = g_input_stream_read (context->stream, buffer, (gsize) len,
+                                  context->cancellable,
+                                  context->error);
+    if (n_read < 0)
+        return -1;
+
+    return (int) n_read;
+}
+
+static int
+context_close (RsvgXmlInputStreamContext *context)
+{
+    gboolean ret;
+
+    /* Don't overwrite a previous error */
+    ret = g_input_stream_close (context->stream, context->cancellable,
+                                *(context->error) == NULL ? context->error : NULL);
+
+    g_object_unref (context->stream);
+    if (context->cancellable)
+        g_object_unref (context->cancellable);
+    g_slice_free (RsvgXmlInputStreamContext, context);
+
+    return ret ? 0 : -1;
+}
+
+/**
+ * _rsvg_xml_input_buffer_new_from_stream:
+ * @context: a #xmlParserCtxtPtr
+ * @input_stream: a #GInputStream
+ *
+ * Returns: a new #xmlParserInputPtr wrapping @input_stream
+ */
+xmlParserInputBufferPtr
+_rsvg_xml_input_buffer_new_from_stream (GInputStream   *stream,
+                                        GCancellable   *cancellable,
+                                        xmlCharEncoding enc,
+                                        GError        **error)
+
+{
+    RsvgXmlInputStreamContext *context;
+
+    g_return_val_if_fail (G_IS_INPUT_STREAM (stream), NULL);
+    g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable), NULL);
+    g_return_val_if_fail (error != NULL, NULL);
+
+    context = g_slice_new (RsvgXmlInputStreamContext);
+    context->stream = g_object_ref (stream);
+    context->cancellable = cancellable ? g_object_ref (cancellable) : NULL;
+    context->error = error;
+
+    return xmlParserInputBufferCreateIO ((xmlInputReadCallback) context_read,
+                                         (xmlInputCloseCallback) context_close,
+                                         context,
+                                         enc);
+}
diff --git a/rsvg-xml.h b/rsvg-xml.h
new file mode 100644
index 0000000..95158d8
--- /dev/null
+++ b/rsvg-xml.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright © 2010 Christian Persch
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of the
+ * License, or (at your option) any later version.
+  
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+  
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+*/
+
+#ifndef RSVG_XML_H
+#define RSVG_XML_H
+
+#include <libxml/xmlIO.h>
+#include <gio/gio.h>
+
+G_BEGIN_DECLS
+
+xmlParserInputBufferPtr _rsvg_xml_input_buffer_new_from_stream (GInputStream   *stream,
+                                                                GCancellable   *cancellable,
+                                                                xmlCharEncoding enc,
+                                                                GError        **error);
+
+G_END_DECLS
+
+#endif /* !RSVG_XML_H */