add preset.c and preset.h

Makefile

@@ -1,7 +1,7 @@
 CC = gcc
-CFLAGS = `pkg-config --cflags glib-2.0 gtk+-2.0` -Wall -g
+CFLAGS = `pkg-config --cflags glib-2.0 gio-2.0 gtk+-2.0` -Wall -g
 OFLAG = -o
-LIBS = `pkg-config --libs glib-2.0 gtk+-2.0 alsa`
+LIBS = `pkg-config --libs glib-2.0 gio-2.0 gtk+-2.0 alsa` -lexpat
 
 .SUFFIXES : .o .c
 .c.o :
@@ -9,8 +9,8 @@ LIBS = `pkg-config --libs glib-2.0 gtk+-2.0 alsa`
 
 all: gdigi
 
-gdigi: gdigi.o tests.o gui.o effects.o
+gdigi: gdigi.o tests.o gui.o effects.o preset.o
-	$(CC) $(LIBS) $(OFLAG) gdigi gdigi.o tests.o gui.o effects.o
+	$(CC) $(LIBS) $(OFLAG) gdigi gdigi.o tests.o gui.o effects.o preset.o
 
 gdigi.o: gdigi.c
 
@@ -20,6 +20,8 @@ gui.o: gui.c
 
 effects.o: effects.c
 
+preset.o: preset.c
+
 clean:
 	rm *.o
 

README

@@ -1,4 +1,4 @@
-Requirments: alsa, gtk+, glib
+Requirments: alsa, gtk+, glib, expat
 
 Getting started guide:
 -to compile: make

preset.c

@@ -0,0 +1,181 @@
+/*
+ *  Copyright (c) 2009 Tomasz Moń <desowin@gmail.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; under version 3 of the License.
+ *
+ *  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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses>.
+ */
+
+#include <gio/gio.h>
+#include <expat.h>
+#include <string.h>
+#include "preset.h"
+
+enum {
+  PARSER_TYPE_NOT_SET = -1,
+  PARSER_TYPE_PRESET_NAME = 0,
+  PARSER_TYPE_PARAM_ID,
+  PARSER_TYPE_PARAM_POSITION,
+  PARSER_TYPE_PARAM_VALUE,
+  PARSER_TYPE_PARAM_NAME,
+  PARSER_TYPE_PARAM_TEXT
+};
+
+typedef struct {
+    int depth;
+    int id;
+    Preset *preset;
+} AppData;
+
+static void XMLCALL start(void *data, const char *el, const char **attr) {
+    AppData *ad = (AppData *) data;
+
+    ad->id = PARSER_TYPE_NOT_SET;
+    if (g_strcmp0(el, "Name") == 0) {
+        if (ad->depth == 1) {
+            ad->id = PARSER_TYPE_PRESET_NAME;
+        } else if (ad->depth == 3) {
+            ad->id = PARSER_TYPE_PARAM_NAME;
+        }
+    }
+
+    if (g_strcmp0(el, "Params") == 0) {
+        if (ad->preset->params != NULL)
+            g_message("Params aleady exists!");
+    } else if (g_strcmp0(el, "Param") == 0) {
+        SettingParam *param = (SettingParam *)g_malloc(sizeof(SettingParam));
+        param->id = -1;
+        param->position = -1;
+        param->value = -1;
+        ad->preset->params = g_list_prepend(ad->preset->params, param);
+    } else if (g_strcmp0(el, "ID") == 0) {
+        ad->id = PARSER_TYPE_PARAM_ID;
+    } else if (g_strcmp0(el, "Position") == 0) {
+        ad->id = PARSER_TYPE_PARAM_POSITION;
+    } else if (g_strcmp0(el, "Value") == 0) {
+        ad->id = PARSER_TYPE_PARAM_VALUE;
+    } else if (g_strcmp0(el, "Text") == 0) {
+        ad->id = PARSER_TYPE_PARAM_TEXT;
+    }
+
+    ad->depth++;
+}
+
+static void XMLCALL end(void *data, const char *el) {
+    AppData *ad = (AppData *) data;
+    ad->depth--;
+    ad->id = PARSER_TYPE_NOT_SET;
+}
+
+static void XMLCALL text_cb(void *data, const char* text, int len)
+{
+    AppData *ad = (AppData *) data;
+
+    if ((ad == NULL) || (ad->preset == NULL))
+        return;
+
+    if (ad->id == PARSER_TYPE_PRESET_NAME) {
+        if (ad->preset->name != NULL)
+            g_free(ad->preset->name);
+        ad->preset->name = g_strndup(text, len);
+    }
+
+    if (ad->preset->params == NULL)
+        return;
+
+    SettingParam *param = (SettingParam *) ad->preset->params->data;
+    if (param == NULL)
+        return;
+
+    gchar *value = g_strndup(text, len);
+
+    switch (ad->id) {
+        case PARSER_TYPE_PARAM_ID:
+            param->id = atoi(value);
+            break;
+        case PARSER_TYPE_PARAM_POSITION:
+            param->position = atoi(value);
+            break;
+        case PARSER_TYPE_PARAM_VALUE:
+            param->value = atoi(value);
+            break;
+    }
+
+    g_free(value);
+}
+
+/*
+   Parses preset file
+   On success returns Preset which must be freed using preset_free, or NULL on error
+*/
+Preset *create_preset_from_xml_file(gchar *filename)
+{
+    GFile *file;
+    GError *error = NULL;
+    gchar *contents;
+
+    file = g_file_new_for_path(filename);
+    if (g_file_get_contents(filename, &contents, NULL, &error) == FALSE) {
+        g_message("Failed to get %s contents: %s", filename, error->message);
+        g_error_free(error);
+        g_object_unref(file);
+        return NULL;
+    }
+
+    AppData *ad = (AppData *) g_malloc(sizeof(AppData));
+    ad->depth = 0;
+    ad->preset = g_malloc(sizeof(Preset));
+    ad->preset->name = NULL;
+    ad->preset->params = NULL;
+    ad->id = PARSER_TYPE_NOT_SET;
+
+    XML_Parser p;
+    p = XML_ParserCreate(NULL);
+    XML_SetUserData(p, (void *) ad);
+    XML_SetElementHandler(p, start, end);
+    XML_SetCharacterDataHandler(p, text_cb);
+
+    if (XML_Parse(p, contents, strlen(contents), XML_TRUE) != XML_STATUS_OK) {
+        g_warning("Parse error at line %d:\n%s",
+                  (int)XML_GetCurrentLineNumber(p),
+                  XML_ErrorString(XML_GetErrorCode(p)));
+        preset_free(ad->preset);
+        g_free(ad);
+        g_free(contents);
+        g_object_unref(file);
+        return NULL;
+    }
+
+    Preset *preset = ad->preset;
+    preset->params = g_list_reverse(preset->params);
+
+    XML_ParserFree(p);
+    g_free(ad);
+
+    g_free(contents);
+    g_object_unref(file);
+    return preset;
+}
+
+void preset_free(Preset *preset)
+{
+    g_return_if_fail(preset != NULL);
+
+    if (preset->params != NULL) {
+        g_list_foreach(preset->params, (GFunc)g_free, NULL);
+        g_list_free(preset->params);
+    }
+
+    if (preset->name != NULL)
+        g_free(preset->name);
+
+    g_free(preset);
+}

preset.h

@@ -0,0 +1,36 @@
+/*
+ *  Copyright (c) 2009 Tomasz Moń <desowin@gmail.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; under version 3 of the License.
+ *
+ *  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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses>.
+ */
+
+#ifndef GDIGI_PRESET_H
+#define GDIGI_PRESET_H
+
+#include <glib.h>
+
+typedef struct {
+    int id;
+    int position;
+    int value;
+} SettingParam;
+
+typedef struct {
+    gchar *name;
+    GList *params;
+} Preset;
+
+Preset *create_preset_from_xml_file(gchar *filename);
+void preset_free(Preset *preset);
+
+#endif /* GDIGI_PRESET_H */