GSoC/Buflib: Add buflib memory alocator to the core.

The buflib memory allocator is handle based and can free and
compact, move or resize memory on demand. This allows to effeciently
allocate memory dynamically without an MMU, by avoiding fragmentation
through memory compaction.

This patch adds the buflib library to the core, along with
convinience wrappers to omit the context parameter. Compaction is
not yet enabled, but will be in a later patch. Therefore, this acts as a
replacement for buffer_alloc/buffer_get_buffer() with the benifit of a debug
menu.

See buflib.h for some API documentation.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30380 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 20 insertions, 9 deletions

diff --git a/apps/filetypes.c b/apps/filetypes.c
index 17a16db4ec..c52c734a1d 100644
--- a/apps/filetypes.c
+++ b/apps/filetypes.c
@@ -36,7 +36,7 @@
 #include "dir.h"
 #include "file.h"
 #include "splash.h"
-#include "buffer.h"
+#include "core_alloc.h"
 #include "icons.h"
 #include "logf.h"
 
@@ -183,12 +183,14 @@ static int filetype_count = 0;
 static unsigned char highest_attr = 0;
 static int viewer_count = 0;
 
+static int strdup_handle, strdup_bufsize, strdup_cur_idx;
 static char *filetypes_strdup(char* string)
 {
-    char *buffer = (char*)buffer_alloc(strlen(string)+1);
-    strcpy(buffer, string);
+    char *buffer = core_get_data(strdup_handle) + strdup_cur_idx;
+    strdup_cur_idx += strlcpy(buffer, string, strdup_bufsize-strdup_cur_idx)+1;
     return buffer;
 }
+
 static char *filetypes_store_plugin(char *plugin, int n)
 {
     int i;
@@ -219,7 +221,7 @@ static int find_extension(const char* extension)
 }
 
 static void read_builtin_types(void);
-static void read_config(const char* config_file);
+static void read_config(int fd);
 #ifdef HAVE_LCD_COLOR
 /* Colors file format is similar to icons:
  * ext:hex_color
@@ -312,16 +314,28 @@ void  filetype_init(void)
     filetypes[0].attr   = 0;
     filetypes[0].icon   = Icon_Folder;
 
+    /* estimate bufsize with the filesize, will not be larger */
     viewer_count = 0;
     filetype_count = 1;
+
+    int fd = open(VIEWERS_CONFIG, O_RDONLY);
+    if (fd < 0)
+        return;
+
+    strdup_bufsize = filesize(fd);
+    strdup_handle = core_alloc("filetypes", strdup_bufsize);
+    if (strdup_handle <= 0)
+        return;
     read_builtin_types();
-    read_config(VIEWERS_CONFIG);
+    read_config(fd);
 #ifdef HAVE_LCD_BITMAP
     read_viewer_theme_file();
 #endif
 #ifdef HAVE_LCD_COLOR
     read_color_theme_file();
 #endif
+    close(fd);
+    core_shrink(strdup_handle, core_get_data(strdup_handle), strdup_cur_idx);
 }
 
 /* remove all white spaces from string */
@@ -355,13 +369,10 @@ static void read_builtin_types(void)
     }
 }
 
-static void read_config(const char* config_file)
+static void read_config(int fd)
 {
     char line[64], *s, *e;
     char *extension, *plugin;
-    int fd = open(config_file, O_RDONLY);
-    if (fd < 0)
-        return;
     /* config file is in the format
        <extension>,<plugin>,<icon code>
        ignore line if either of the first two are missing */