From 22884ccdf3275cf8596d3aeea4e312fd80f83048 Mon Sep 17 00:00:00 2001
From: Slava Monich <slava.monich@jolla.com>
Date: Sun, 28 Jun 2015 22:28:54 +0300
Subject: [PATCH] Eliminated hard dependency on expat

---
 app/app.pro           |   3 +-
 app/src/expat.c       | 119 ++++++++++++++++++++++++++++++++++++++++++
 fbreader/fbreader.pro |   2 +-
 3 files changed, 122 insertions(+), 2 deletions(-)
 create mode 100644 app/src/expat.c

diff --git a/app/app.pro b/app/app.pro
index a54d7ce..83a8e56 100644
--- a/app/app.pro
+++ b/app/app.pro
@@ -1,6 +1,6 @@
 TARGET = harbour-books
 CONFIG += sailfishapp link_pkgconfig
-PKGCONFIG += sailfishapp mlite5 expat glib-2.0
+PKGCONFIG += sailfishapp mlite5 glib-2.0
 #QT += dbus
 
 !include(../common.pri)
@@ -106,6 +106,7 @@ SOURCES += \
   src/BooksTextStyle.cpp \
   src/BooksTaskQueue.cpp \
   src/BooksTextView.cpp \
+  src/expat.c \
   src/libudev.c \
   src/main.cpp \
   src/ZLApplication.cpp \
diff --git a/app/src/expat.c b/app/src/expat.c
new file mode 100644
index 0000000..2b2b9c6
--- /dev/null
+++ b/app/src/expat.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright (C) 2015 Jolla Ltd.
+ * Contact: Slava Monich <slava.monich@jolla.com>
+ *
+ * You may use this file under the terms of the BSD license as follows:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in
+ *     the documentation and/or other materials provided with the
+ *     distribution.
+ *   * Neither the name of Nemo Mobile nor the names of its contributors
+ *     may be used to endorse or promote products derived from this
+ *     software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <expat.h>
+#include <stdlib.h>
+#include <dlfcn.h>
+
+#define EXPAT_FUNCTIONS(f) \
+    f(XML_Parser, XML_ExternalEntityParserCreate, \
+     (XML_Parser parser, const XML_Char* context, const XML_Char* encoding), \
+     (parser, context, encoding), NULL) \
+    f(XML_Bool, XML_ParserReset,\
+     (XML_Parser parser, const XML_Char* encoding), \
+     (parser, encoding), XML_FALSE) \
+    f(void, XML_SetUserData, \
+     (XML_Parser parser, void* userData), \
+     (parser, userData), (void)0) \
+    f(void, XML_SetUnknownEncodingHandler, \
+     (XML_Parser parser, XML_UnknownEncodingHandler handler, void* data), \
+     (parser, handler, data), (void)0) \
+    f(void, XML_SetCharacterDataHandler, \
+     (XML_Parser parser, XML_CharacterDataHandler handler), \
+     (parser, handler), (void)0) \
+    f(enum XML_Error, XML_UseForeignDTD, \
+     (XML_Parser parser, XML_Bool useDTD), \
+     (parser, useDTD), XML_ERROR_UNEXPECTED_STATE) \
+    f(enum XML_Status, XML_SetEncoding, \
+     (XML_Parser parser, const XML_Char* encoding), \
+     (parser, encoding), XML_STATUS_ERROR) \
+    f(void, XML_SetStartElementHandler, \
+     (XML_Parser parser, XML_StartElementHandler handler), \
+     (parser, handler), (void)0) \
+    f(void, XML_SetEndElementHandler, \
+     (XML_Parser parser, XML_EndElementHandler handler), \
+     (parser, handler), (void)0) \
+    f(void, XML_ParserFree, \
+     (XML_Parser parser), \
+     (parser), (void)0) \
+    f(enum XML_Status, XML_Parse, \
+     (XML_Parser parser, const char* s, int len, int isFinal), \
+     (parser, s, len, isFinal), XML_STATUS_ERROR)
+
+static struct {
+    void* handle;
+    union {
+        struct expat_proc {
+            XML_Parser (*XML_ParserCreate)(const XML_Char* encoding);
+            #define FN_POINTER(type,name,params,args,fail) type (* name) params;
+            EXPAT_FUNCTIONS(FN_POINTER)
+        } expat;
+        void* entry[1];
+    } fn;
+} expat;
+
+static const char* expat_names[] = {
+    "XML_ParserCreate",
+    #define FN_NAME(type,name,params,args,fail) #name,
+    EXPAT_FUNCTIONS(FN_NAME)
+};
+
+#define EXPAT_NUM_FUNCTIONS (sizeof(expat_names)/sizeof(expat_names[0]))
+#define EXPAT_NO_HANDLE     ((void*)-1)
+#define EXPAT_SO            "/usr/lib/libexpat.so.1"
+
+/* XML_ParserCreate() is the special function where we load the library */
+XML_Parser
+XML_ParserCreate(
+    const XML_Char* encoding)
+{
+    if (!expat.handle) {
+        expat.handle = dlopen(EXPAT_SO, RTLD_LAZY);
+        if (expat.handle) {
+            unsigned int i;
+            for (i=0; i<EXPAT_NUM_FUNCTIONS; i++) {
+                expat.fn.entry[i] = dlsym(expat.handle, expat_names[i]);
+            }
+        } else {
+            expat.handle = EXPAT_NO_HANDLE;
+        }
+    }
+    return expat.fn.expat.XML_ParserCreate ?
+        expat.fn.expat.XML_ParserCreate(encoding) :
+        NULL;
+}
+
+/* All other wrappers are generated by the preprocessor */
+#define FN_IMPL(type,name,params,args,fail) type name params \
+  { return expat.fn.expat.name ? expat.fn.expat.name args : fail; }
+EXPAT_FUNCTIONS(FN_IMPL)
diff --git a/fbreader/fbreader.pro b/fbreader/fbreader.pro
index 2ee2cd9..ef070f8 100644
--- a/fbreader/fbreader.pro
+++ b/fbreader/fbreader.pro
@@ -1,7 +1,7 @@
 TEMPLATE = lib
 TARGET = fbreader
 CONFIG += staticlib object_parallel_to_source link_pkgconfig
-PKGCONFIG += expat glib-2.0
+PKGCONFIG += glib-2.0
 
 !include(../common.pri)