Adding a new buf module for buffers

This also add converter functions between xmlBuf and xmlBuffer
* buf.c buf.h: the old xmlBuffer routines but modified for size_t
  and using xmlBuf instead of xmlBuffer
* Makefile.am: add the 2 new files
* include/libxml/xmlerror.h: add an entry for the new module
* include/libxml/tree.h: expose the xmlBufPtr type but not the
  structure which stay private

2 files changed, 24 insertions, 3 deletions

diff --git a/include/libxml/tree.h b/include/libxml/tree.h
index 2196f8db..7e821bb2 100644
--- a/include/libxml/tree.h
+++ b/include/libxml/tree.h
@@ -13,6 +13,7 @@
 #define __XML_TREE_H__
 
 #include <stdio.h>
+#include <limits.h>
 #include <libxml/xmlversion.h>
 #include <libxml/xmlstring.h>
 
@@ -81,7 +82,8 @@ typedef enum {
 /**
  * xmlBuffer:
  *
- * A buffer structure.
+ * A buffer structure, this old construct is limited to 2GB and
+ * is being deprecated, use API with xmlBuf instead
  */
 typedef struct _xmlBuffer xmlBuffer;
 typedef xmlBuffer *xmlBufferPtr;
@@ -94,6 +96,23 @@ struct _xmlBuffer {
 };
 
 /**
+ * xmlBuf:
+ *
+ * A buffer structure, new one, the actual structure internals are not public
+ */
+
+typedef struct _xmlBuf xmlBuf;
+
+/**
+ * xmlBufPtr:
+ *
+ * A pointer to a buffer structure, the actual structure internals are not
+ * public
+ */
+
+typedef xmlBuf *xmlBufPtr;
+
+/**
  * XML_XML_NAMESPACE:
  *
  * This is the namespace for the special xml: prefix predefined in the
diff --git a/include/libxml/xmlerror.h b/include/libxml/xmlerror.h
index e9242112..85caf52b 100644
--- a/include/libxml/xmlerror.h
+++ b/include/libxml/xmlerror.h
@@ -62,7 +62,8 @@ typedef enum {
     XML_FROM_WRITER,	/* The xmlwriter module */
     XML_FROM_MODULE,	/* The dynamically loaded module module*/
     XML_FROM_I18N,	/* The module handling character conversion */
-    XML_FROM_SCHEMATRONV	/* The Schematron validator module */
+    XML_FROM_SCHEMATRONV,/* The Schematron validator module */
+    XML_FROM_BUFFER     /* The buffers module */
 } xmlErrorDomain;
 
 /**
@@ -825,7 +826,8 @@ typedef enum {
     XML_I18N_NO_HANDLER, /* 6001 */
     XML_I18N_EXCESS_HANDLER, /* 6002 */
     XML_I18N_CONV_FAILED, /* 6003 */
-    XML_I18N_NO_OUTPUT /* 6004 */
+    XML_I18N_NO_OUTPUT, /* 6004 */
+    XML_BUF_OVERFLOW = 7000
 #if 0
     XML_CHECK_, /* 5033 */
     XML_CHECK_X /* 503 */