diff --git a/HTMLparser.c b/HTMLparser.c
index 9c3359f..097ed23 100644
--- a/HTMLparser.c
+++ b/HTMLparser.c
@@ -6841,7 +6841,8 @@ htmlCtxtReadMemory(htmlParserCtxtPtr ctxt, const char *buffer, int size,
 
     htmlCtxtReset(ctxt);
 
-    input = xmlParserInputBufferCreateMem(buffer, size, XML_CHAR_ENCODING_NONE);
+    input = xmlParserInputBufferCreateStatic(buffer, size,
+                                             XML_CHAR_ENCODING_NONE);
     if (input == NULL) {
 	return(NULL);
     }
diff --git a/NEWS b/NEWS
index 48e6f78..53d3c74 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,16 @@
 NEWS file for libxml2
 
+v2.12.4: Jan 15 2024
+
+### Regressions
+
+- parser: Fix regression parsing standalone declarations
+- autotools: Readd --with-xptr-locs configuration option
+- parser: Fix build --without-output
+- parser: Don't grow or shrink pull parser memory buffers
+- io: Fix memory lifetime issue with input buffers
+
+
 v2.12.3: Dec 12 2023
 
 ### Regressions
diff --git a/README.md b/README.md
index da64486..aa13dc4 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 libxml2 Windows build with Visual Studio.
 
-This version is libxml2-2.12.3.
+This version is libxml2-2.12.4.
 
 Note that LZMA support is only available for VS2013 or later.
 
diff --git a/THIS_VERSION_IS_2.12.3 b/THIS_VERSION_IS_2.12.4
similarity index 100%
rename from THIS_VERSION_IS_2.12.3
rename to THIS_VERSION_IS_2.12.4
diff --git a/distfiles/download.url b/distfiles/download.url
index 901e945..5a67ae3 100644
--- a/distfiles/download.url
+++ b/distfiles/download.url
@@ -1 +1 @@
-https://download.gnome.org/sources/libxml2/2.12/libxml2-2.12.3.tar.xz
+https://download.gnome.org/sources/libxml2/2.12/libxml2-2.12.4.tar.xz
diff --git a/distfiles/libxml2-2.12.3.tar.xz b/distfiles/libxml2-2.12.3.tar.xz
deleted file mode 100644
index abca296..0000000
Binary files a/distfiles/libxml2-2.12.3.tar.xz and /dev/null differ
diff --git a/distfiles/libxml2-2.12.3-import.lst b/distfiles/libxml2-2.12.4-import.lst
similarity index 100%
rename from distfiles/libxml2-2.12.3-import.lst
rename to distfiles/libxml2-2.12.4-import.lst
diff --git a/distfiles/libxml2-2.12.3-import.md5 b/distfiles/libxml2-2.12.4-import.md5
similarity index 93%
rename from distfiles/libxml2-2.12.3-import.md5
rename to distfiles/libxml2-2.12.4-import.md5
index 5970c4a..200ee38 100644
--- a/distfiles/libxml2-2.12.3-import.md5
+++ b/distfiles/libxml2-2.12.4-import.md5
@@ -1,8 +1,8 @@
 fec7ecfe714722b2bb0aaff7d200c701  Copyright
-8274a9d01a67fd01a069f62805127a25  HTMLparser.c
+721403e0fda4eada7d113aed94fae756  HTMLparser.c
 ac5d42c343d2093d2a031f59036c5f99  HTMLtree.c
 dd63184811cb2ff705c3e466364d3773  INSTALL
-da5e67a440cb3ee4e3946ba845eead02  NEWS
+30169376fe62b0f94a94e29017dd4ecc  NEWS
 d52aad5f8ace0ed3e5f9b126d72473e1  README.libxml2.md
 7283878f36a935a3c00df077cf45af54  SAX.c
 15289caf4cf19277a510d22c24238a73  SAX2.c
@@ -33,7 +33,7 @@ bc51344e21f8d3b7f0fc93cc9d554243  include/libxml/globals.h
 6c03428a747fbfab599d4e86dd17d6b1  include/libxml/list.h
 d5c907a6d7d205e286168e007f32504c  include/libxml/nanoftp.h
 3f166ef07a961ee21d3561682d859edc  include/libxml/nanohttp.h
-ca827023c1dee058837ce0360e88fa3e  include/libxml/parser.h
+715cf856fa05e7633b1254edfa0a45f4  include/libxml/parser.h
 36c2360e8bdaac08bfccba24e461d07f  include/libxml/parserInternals.h
 f1afd2d52bf66fbf45f02dc35c72c3eb  include/libxml/pattern.h
 d752e41ee40c2b028d0adb34ffc38810  include/libxml/relaxng.h
@@ -45,7 +45,7 @@ d752e41ee40c2b028d0adb34ffc38810  include/libxml/relaxng.h
 f26be264a608ed72fb7c74de76e3be72  include/libxml/valid.h
 d02d257861d28021ad33dad20e2683c3  include/libxml/xinclude.h
 4c7ff0fcbc3595d38f47e41f703dbc61  include/libxml/xlink.h
-b0ebaf812c8258f5e631287de979d537  include/libxml/xmlIO.h
+ef62ebccc685b9bb49f75feab0b2ddd0  include/libxml/xmlIO.h
 78602d66c5db00b0deece2c56ab86d43  include/libxml/xmlautomata.h
 e3fe66a1c3ca6359481c0a4fa25491c6  include/libxml/xmlerror.h
 dc29dad477ae3b1779f8b15fbae14a0d  include/libxml/xmlexports.h
@@ -86,8 +86,8 @@ c2b5c54ee40fd7bfba8eb6b9e90d6dbd  libxml.h
 67985a9e0fc42eebc29d12b884baa00a  list.c
 a9e486124ef2c3a00ecb44001d774484  nanoftp.c
 a2c34ca6d295906ebc9b56d8e056bf7a  nanohttp.c
-55cd384ef09aedba5a740cf9cf0f3d2c  parser.c
-1064b876a87533052e48e7e570c4e670  parserInternals.c
+60bd4103a522e93fd7251f692e95a797  parser.c
+6aceabaf83db5fda83b670ebfd9785dd  parserInternals.c
 8809dafc22e8463d81a392ac8a853a59  pattern.c
 15a40570e75a1cf9f9da7350f9557b86  relaxng.c
 b66e180243852be9fa9f97b0722679ba  runsuite.c
@@ -97,11 +97,11 @@ fc8947f2849d2f27a30318dc3ca831f5  schematron.c
 c48cacc169fbe69e961ceafbfb92ee71  testModule.c
 673cbe4047f34b7d954fd597d46b8716  testThreads.c
 e85d38ab99ab20ed6649989919e52fbd  testapi.c
-1b039d4e46c69d01fdfdb0977c18ab4c  testchar.c
+d665963cfccaa91533d3dfb9f69da42a  testchar.c
 2792f948169570feeb744ddf0cce5025  testdict.c
 6a3e7cbf9864c04639a1a8ac0c388ea2  testdso.c
 e84fe8d1a9d8ea089bf9ea8544a6ea1b  testlimits.c
-f4891e39cf0cba64b9b66382d8d2b9fb  testparser.c
+500ff54f8cee345eb1f3005561ed6dc9  testparser.c
 f9dd10b6caf75faf002e92b703b36897  testrecurse.c
 bef5d0bbecbb90f5a441e52bd2f926a2  threads.c
 1bcb15667ab695cdd2cc8d5b1bc05169  timsort.h
@@ -120,7 +120,7 @@ fd3d55b1d9817a9ef205f35b1d60f527  valid.c
 9ca0965eeabe09b4f8d9a1c6c5d8c3b0  win32/libxml2.rc
 27b6a7946ac148c1f96755bf442ef0f4  xinclude.c
 0a034450d155e35ec8ba99ee2005b695  xlink.c
-2bc8d483b5b1a31e73b2f9d3956a973f  xmlIO.c
+ec9a5e17f4cb2e520e10f5a2d6fc71fc  xmlIO.c
 28bb81f9966d3ec48c510dd56fa10b94  xmlcatalog.c
 77a1978e92525ab506d4f65b895d00cc  xmllint.c
 47188d0524f25fdb396703aa6d5e1fd6  xmlmemory.c
diff --git a/distfiles/libxml2-2.12.4.tar.xz b/distfiles/libxml2-2.12.4.tar.xz
new file mode 100644
index 0000000..70ec283
Binary files /dev/null and b/distfiles/libxml2-2.12.4.tar.xz differ
diff --git a/include/libxml/parser.h b/include/libxml/parser.h
index be8de30..87aacef 100644
--- a/include/libxml/parser.h
+++ b/include/libxml/parser.h
@@ -859,10 +859,16 @@ XMLPUBFUN const char *const *__xmlParserVersion(void);
   XML_OP(xmlLoadExtDtdDefaultValue, int, XML_DEPRECATED) \
   XML_OP(xmlParserDebugEntities, int, XML_DEPRECATED) \
   XML_OP(xmlPedanticParserDefaultValue, int, XML_DEPRECATED) \
-  XML_OP(xmlSubstituteEntitiesDefaultValue, int, XML_DEPRECATED) \
-  XML_OP(xmlIndentTreeOutput, int, XML_NO_ATTR) \
-  XML_OP(xmlTreeIndentString, const char *, XML_NO_ATTR) \
-  XML_OP(xmlSaveNoEmptyTags, int, XML_NO_ATTR)
+  XML_OP(xmlSubstituteEntitiesDefaultValue, int, XML_DEPRECATED)
+
+#ifdef LIBXML_OUTPUT_ENABLED
+  #define XML_GLOBALS_PARSER_OUTPUT \
+    XML_OP(xmlIndentTreeOutput, int, XML_NO_ATTR) \
+    XML_OP(xmlTreeIndentString, const char *, XML_NO_ATTR) \
+    XML_OP(xmlSaveNoEmptyTags, int, XML_NO_ATTR)
+#else
+  #define XML_GLOBALS_PARSER_OUTPUT
+#endif
 
 #ifdef LIBXML_SAX1_ENABLED
   #define XML_GLOBALS_PARSER_SAX1 \
@@ -873,6 +879,7 @@ XMLPUBFUN const char *const *__xmlParserVersion(void);
 
 #define XML_GLOBALS_PARSER \
   XML_GLOBALS_PARSER_CORE \
+  XML_GLOBALS_PARSER_OUTPUT \
   XML_GLOBALS_PARSER_SAX1
 
 #define XML_OP XML_DECLARE_GLOBAL
@@ -896,9 +903,11 @@ XML_GLOBALS_PARSER
     XML_GLOBAL_MACRO(xmlPedanticParserDefaultValue)
   #define xmlSubstituteEntitiesDefaultValue \
     XML_GLOBAL_MACRO(xmlSubstituteEntitiesDefaultValue)
-  #define xmlIndentTreeOutput XML_GLOBAL_MACRO(xmlIndentTreeOutput)
-  #define xmlTreeIndentString XML_GLOBAL_MACRO(xmlTreeIndentString)
-  #define xmlSaveNoEmptyTags XML_GLOBAL_MACRO(xmlSaveNoEmptyTags)
+  #ifdef LIBXML_OUTPUT_ENABLED
+    #define xmlIndentTreeOutput XML_GLOBAL_MACRO(xmlIndentTreeOutput)
+    #define xmlTreeIndentString XML_GLOBAL_MACRO(xmlTreeIndentString)
+    #define xmlSaveNoEmptyTags XML_GLOBAL_MACRO(xmlSaveNoEmptyTags)
+  #endif
 #endif
 /** DOC_ENABLE */
 
diff --git a/include/libxml/xmlIO.h b/include/libxml/xmlIO.h
index eaea076..2487be3 100644
--- a/include/libxml/xmlIO.h
+++ b/include/libxml/xmlIO.h
@@ -218,7 +218,6 @@ XMLPUBFUN xmlParserInputBufferPtr
 XMLPUBFUN xmlParserInputBufferPtr
 	xmlParserInputBufferCreateMem		(const char *mem, int size,
 	                                         xmlCharEncoding enc);
-XML_DEPRECATED
 XMLPUBFUN xmlParserInputBufferPtr
 	xmlParserInputBufferCreateStatic	(const char *mem, int size,
 	                                         xmlCharEncoding enc);
diff --git a/include/libxml/xmlversion.h b/include/libxml/xmlversion.h
index 258c3ca..1a9eaa6 100644
--- a/include/libxml/xmlversion.h
+++ b/include/libxml/xmlversion.h
@@ -29,21 +29,21 @@ XMLPUBFUN void xmlCheckVersion(int version);
  *
  * the version string like "1.2.3"
  */
-#define LIBXML_DOTTED_VERSION "2.12.3"
+#define LIBXML_DOTTED_VERSION "2.12.4"
 
 /**
  * LIBXML_VERSION:
  *
  * the version number: 1.2.3 value is 10203
  */
-#define LIBXML_VERSION 21203
+#define LIBXML_VERSION 21204
 
 /**
  * LIBXML_VERSION_STRING:
  *
  * the version number string, 1.2.3 value is "10203"
  */
-#define LIBXML_VERSION_STRING "21203"
+#define LIBXML_VERSION_STRING "21204"
 
 /**
  * LIBXML_VERSION_EXTRA:
@@ -58,7 +58,7 @@ XMLPUBFUN void xmlCheckVersion(int version);
  * Macro to check that the libxml version in use is compatible with
  * the version the software has been compiled against
  */
-#define LIBXML_TEST_VERSION xmlCheckVersion(21203);
+#define LIBXML_TEST_VERSION xmlCheckVersion(21204);
 
 #ifndef VMS
 #if 0
diff --git a/parser.c b/parser.c
index e3587dc..0897af8 100644
--- a/parser.c
+++ b/parser.c
@@ -208,8 +208,7 @@ xmlParseExternalEntityPrivate(xmlDocPtr doc, xmlParserCtxtPtr oldctxt,
 		      const xmlChar *ID, xmlNodePtr *list);
 
 static int
-xmlCtxtUseOptionsInternal(xmlParserCtxtPtr ctxt, int options,
-                          const char *encoding);
+xmlCtxtUseOptionsInternal(xmlParserCtxtPtr ctxt, int options);
 #ifdef LIBXML_LEGACY_ENABLED
 static void
 xmlAddEntityReference(xmlEntityPtr ent, xmlNodePtr firstNode,
@@ -13238,7 +13237,7 @@ xmlParseInNodeContext(xmlNodePtr node, const char *data, int datalen,
         }
     }
 
-    xmlCtxtUseOptionsInternal(ctxt, options, NULL);
+    xmlCtxtUseOptionsInternal(ctxt, options);
     xmlDetectSAX2(ctxt);
     ctxt->myDoc = doc;
     /* parsing in context, i.e. as within existing content */
@@ -13415,7 +13414,7 @@ xmlParseBalancedChunkMemoryRecover(xmlDocPtr doc, xmlSAXHandlerPtr sax,
         newDoc->dict = ctxt->dict;
         xmlDictReference(newDoc->dict);
     } else {
-	xmlCtxtUseOptionsInternal(ctxt, XML_PARSE_NODICT, NULL);
+	xmlCtxtUseOptionsInternal(ctxt, XML_PARSE_NODICT);
     }
     /* doc == NULL is only supported for historic reasons */
     if (doc != NULL) {
@@ -13700,7 +13699,7 @@ xmlCreateURLParserCtxt(const char *filename, int options)
     }
 
     if (options)
-	xmlCtxtUseOptionsInternal(ctxt, options, NULL);
+	xmlCtxtUseOptionsInternal(ctxt, options);
     ctxt->linenumbers = 1;
 
     inputStream = xmlLoadExternalEntity(filename, NULL, ctxt);
@@ -14557,15 +14556,10 @@ xmlCtxtResetPush(xmlParserCtxtPtr ctxt, const char *chunk,
  *         in case of error.
  */
 static int
-xmlCtxtUseOptionsInternal(xmlParserCtxtPtr ctxt, int options, const char *encoding)
+xmlCtxtUseOptionsInternal(xmlParserCtxtPtr ctxt, int options)
 {
     if (ctxt == NULL)
         return(-1);
-    if (encoding != NULL) {
-        if (ctxt->encoding != NULL)
-	    xmlFree((xmlChar *) ctxt->encoding);
-        ctxt->encoding = xmlStrdup((const xmlChar *) encoding);
-    }
     if (options & XML_PARSE_RECOVER) {
         ctxt->recovery = 1;
         options -= XML_PARSE_RECOVER;
@@ -14698,7 +14692,7 @@ xmlCtxtUseOptionsInternal(xmlParserCtxtPtr ctxt, int options, const char *encodi
 int
 xmlCtxtUseOptions(xmlParserCtxtPtr ctxt, int options)
 {
-   return(xmlCtxtUseOptionsInternal(ctxt, options, NULL));
+   return(xmlCtxtUseOptionsInternal(ctxt, options));
 }
 
 /**
@@ -14738,7 +14732,7 @@ xmlDoRead(xmlParserCtxtPtr ctxt, const char *URL, const char *encoding,
 {
     xmlDocPtr ret;
 
-    xmlCtxtUseOptionsInternal(ctxt, options, encoding);
+    xmlCtxtUseOptionsInternal(ctxt, options);
     if (encoding != NULL) {
         xmlCharEncodingHandlerPtr hdlr;
 
@@ -15040,7 +15034,8 @@ xmlCtxtReadMemory(xmlParserCtxtPtr ctxt, const char *buffer, int size,
 
     xmlCtxtReset(ctxt);
 
-    input = xmlParserInputBufferCreateMem(buffer, size, XML_CHAR_ENCODING_NONE);
+    input = xmlParserInputBufferCreateStatic(buffer, size,
+                                             XML_CHAR_ENCODING_NONE);
     if (input == NULL) {
 	return(NULL);
     }
diff --git a/parserInternals.c b/parserInternals.c
index 5be1d06..e6b4cb1 100644
--- a/parserInternals.c
+++ b/parserInternals.c
@@ -520,6 +520,9 @@ xmlParserGrow(xmlParserCtxtPtr ctxt) {
     /* Don't grow push parser buffer. */
     if ((ctxt->progressive) && (ctxt->inputNr <= 1))
         return(0);
+    /* Don't grow memory buffers. */
+    if ((buf->encoder == NULL) && (buf->readcallback == NULL))
+        return(0);
     if (buf->error != 0)
         return(-1);
 
@@ -571,6 +574,10 @@ xmlParserInputGrow(xmlParserInputPtr in, int len) {
     if (in->cur == NULL) return(-1);
     if (in->buf->buffer == NULL) return(-1);
 
+    /* Don't grow memory buffers. */
+    if ((in->buf->encoder == NULL) && (in->buf->readcallback == NULL))
+        return(0);
+
     indx = in->cur - in->base;
     if (xmlBufUse(in->buf->buffer) > (unsigned int) indx + INPUT_CHUNK) {
         return(0);
@@ -604,6 +611,11 @@ xmlParserShrink(xmlParserCtxtPtr ctxt) {
 
     if (buf == NULL)
         return;
+    /* Don't shrink pull parser memory buffers. */
+    if (((ctxt->progressive == 0) || (ctxt->inputNr > 1)) &&
+        (buf->encoder == NULL) &&
+        (buf->readcallback == NULL))
+        return;
 
     used = in->cur - in->base;
     /*
diff --git a/testchar.c b/testchar.c
index 8895d8d..f4b2f4f 100644
--- a/testchar.c
+++ b/testchar.c
@@ -648,8 +648,8 @@ static int testCharRanges(void) {
         fprintf(stderr, "Failed to allocate parser context\n");
 	return(1);
     }
-    buf = xmlParserInputBufferCreateMem(data, sizeof(data),
-                                        XML_CHAR_ENCODING_NONE);
+    buf = xmlParserInputBufferCreateStatic(data, sizeof(data),
+                                           XML_CHAR_ENCODING_NONE);
     if (buf == NULL) {
         fprintf(stderr, "Failed to allocate input buffer\n");
 	test_ret = 1;
diff --git a/testparser.c b/testparser.c
index 625ba10..e67cea5 100644
--- a/testparser.c
+++ b/testparser.c
@@ -6,6 +6,26 @@
 
 #include <libxml/parser.h>
 
+static int
+testStandaloneWithEncoding(void) {
+    xmlDocPtr doc;
+    const char *str =
+        "<?xml version=\"1.0\" standalone=\"yes\"?>\n"
+        "<doc></doc>\n";
+    int err = 0;
+
+    xmlResetLastError();
+
+    doc = xmlReadDoc(BAD_CAST str, NULL, "UTF-8", 0);
+    if (doc == NULL) {
+        fprintf(stderr, "xmlReadDoc failed\n");
+        err = 1;
+    }
+    xmlFreeDoc(doc);
+
+    return err;
+}
+
 #ifdef LIBXML_PUSH_ENABLED
 static int
 testHugePush(void) {
@@ -70,6 +90,7 @@ int
 main(void) {
     int err = 0;
 
+    err |= testStandaloneWithEncoding();
 #ifdef LIBXML_PUSH_ENABLED
     err |= testHugePush();
     err |= testHugeEncodedChunk();
diff --git a/win32/rcVersion.h b/win32/rcVersion.h
index 64d27d1..c582668 100644
--- a/win32/rcVersion.h
+++ b/win32/rcVersion.h
@@ -1,4 +1,4 @@
 #define LIBXML_MAJOR_VERSION 2
 #define LIBXML_MINOR_VERSION 12
-#define LIBXML_MICRO_VERSION 3
-#define LIBXML_DOTTED_VERSION "2.12.3"
+#define LIBXML_MICRO_VERSION 4
+#define LIBXML_DOTTED_VERSION "2.12.4"
diff --git a/xmlIO.c b/xmlIO.c
index b1ff0df..22acb59 100644
--- a/xmlIO.c
+++ b/xmlIO.c
@@ -2849,7 +2849,8 @@ xmlParserInputBufferCreateFd(int fd, xmlCharEncoding enc) {
 }
 
 typedef struct {
-    const char *mem;
+    char *mem;
+    const char *cur;
     size_t size;
 } xmlMemIOCtxt;
 
@@ -2860,8 +2861,8 @@ xmlMemRead(void *vctxt, char *buf, int size) {
     if ((size_t) size > ctxt->size)
         size = ctxt->size;
 
-    memcpy(buf, ctxt->mem, size);
-    ctxt->mem += size;
+    memcpy(buf, ctxt->cur, size);
+    ctxt->cur += size;
     ctxt->size -= size;
 
     return size;
@@ -2869,7 +2870,11 @@ xmlMemRead(void *vctxt, char *buf, int size) {
 
 static int
 xmlMemClose(void *vctxt) {
-    xmlFree(vctxt);
+    xmlMemIOCtxt *ctxt = vctxt;
+
+    if (ctxt->mem != 0)
+        xmlFree(ctxt->mem);
+    xmlFree(ctxt);
     return(0);
 }
 
@@ -2879,36 +2884,42 @@ xmlMemClose(void *vctxt) {
  * @size:  the length of the memory block
  * @enc:  the charset encoding if known
  *
- * Create a buffered parser input for the progressive parsing for the input
- * from a memory area.
+ * Create a parser input buffer for parsing from a memory area.
  *
- * Returns the new parser input or NULL
+ * This function makes a copy of the whole input buffer. If you are sure
+ * that the contents of the buffer will remain valid until the document
+ * was parsed, you can avoid the copy by using
+ * xmlParserInputBufferCreateStatic.
+ *
+ * The encoding argument is deprecated and should be set to
+ * XML_CHAR_ENCODING_NONE. The encoding can be changed with
+ * xmlSwitchEncoding or xmlSwitchEncodingName later on.
+ *
+ * Returns the new parser input or NULL in case of error.
  */
 xmlParserInputBufferPtr
 xmlParserInputBufferCreateMem(const char *mem, int size, xmlCharEncoding enc) {
-    xmlParserInputBufferPtr ret;
+    xmlParserInputBufferPtr buf;
     xmlMemIOCtxt *ctxt;
+    char *copy;
 
-    if (size < 0) return(NULL);
-    if (mem == NULL) return(NULL);
+    if ((size < 0) || (mem == NULL))
+        return(NULL);
 
-    ret = xmlAllocParserInputBuffer(enc);
-    if (ret == NULL)
+    copy = (char *) xmlStrndup((const xmlChar *) mem, size);
+    if (copy == NULL)
         return(NULL);
 
-    ctxt = xmlMalloc(sizeof(*ctxt));
-    if (ctxt == NULL) {
-        xmlFreeParserInputBuffer(ret);
+    buf = xmlParserInputBufferCreateStatic(copy, size, enc);
+    if (buf == NULL) {
+        xmlFree(copy);
         return(NULL);
     }
-    ctxt->mem = mem;
-    ctxt->size = size;
 
-    ret->context = ctxt;
-    ret->readcallback = xmlMemRead;
-    ret->closecallback = xmlMemClose;
+    ctxt = buf->context;
+    ctxt->mem = copy;
 
-    return(ret);
+    return(buf);
 }
 
 /**
@@ -2917,14 +2928,45 @@ xmlParserInputBufferCreateMem(const char *mem, int size, xmlCharEncoding enc) {
  * @size:  the length of the memory block
  * @enc:  the charset encoding if known
  *
- * DEPRECATED: Use xmlParserInputBufferCreateMem.
+ * Create a parser input buffer for parsing from a memory area.
  *
- * Returns the new parser input or NULL
+ * This functions assumes that the contents of the input buffer remain
+ * valid until the document was parsed. Use xmlParserInputBufferCreateMem
+ * otherwise.
+ *
+ * The encoding argument is deprecated and should be set to
+ * XML_CHAR_ENCODING_NONE. The encoding can be changed with
+ * xmlSwitchEncoding or xmlSwitchEncodingName later on.
+ *
+ * Returns the new parser input or NULL in case of error.
  */
 xmlParserInputBufferPtr
 xmlParserInputBufferCreateStatic(const char *mem, int size,
                                  xmlCharEncoding enc) {
-    return(xmlParserInputBufferCreateMem(mem, size, enc));
+    xmlParserInputBufferPtr ret;
+    xmlMemIOCtxt *ctxt;
+
+    if ((size < 0) || (mem == NULL))
+        return(NULL);
+
+    ret = xmlAllocParserInputBuffer(enc);
+    if (ret == NULL)
+        return(NULL);
+
+    ctxt = xmlMalloc(sizeof(*ctxt));
+    if (ctxt == NULL) {
+        xmlFreeParserInputBuffer(ret);
+        return(NULL);
+    }
+    ctxt->mem = NULL;
+    ctxt->cur = mem;
+    ctxt->size = size;
+
+    ret->context = ctxt;
+    ret->readcallback = xmlMemRead;
+    ret->closecallback = xmlMemClose;
+
+    return(ret);
 }
 
 typedef struct {