1 files changed, 94 insertions, 0 deletions

diff --git a/apps/plugins/imageviewer/jpegp/BUFFILEGETC.c b/apps/plugins/imageviewer/jpegp/BUFFILEGETC.c
new file mode 100644
index 0000000000..5124636731
--- /dev/null
+++ b/apps/plugins/imageviewer/jpegp/BUFFILEGETC.c
@@ -0,0 +1,94 @@
+/* Simple buffered version of file reader.
+ * JPEG decoding seems to work faster with it.
+ * Not fully tested. In case of any issues try FILEGETC (see SOURCES)
+ * */
+#include "rb_glue.h"
+
+static int fd;
+static unsigned char buff[256]; //TODO: Adjust it...
+static int length = 0;
+static int cur_buff_pos = 0;
+static int file_pos = 0;
+
+extern int GETC(void)
+{
+    if (cur_buff_pos >= length)
+    {
+        length = rb->read(fd, buff, sizeof(buff));
+        file_pos += length;
+        cur_buff_pos = 0;
+    }
+
+    return buff[cur_buff_pos++];
+}
+
+// multibyte readers: host-endian independent - if evaluated in right order (ie. don't optimize)
+
+extern int GETWbi(void)         // 16-bit big-endian
+{
+    return ( GETC()<<8 ) | GETC();
+}
+
+extern int GETDbi(void)         // 32-bit big-endian
+{
+    return ( GETC()<<24 ) | ( GETC()<<16 ) | ( GETC()<<8 ) | GETC();
+}
+
+extern int GETWli(void)         // 16-bit little-endian
+{
+    return GETC() | ( GETC()<<8 );
+}
+
+extern int GETDli(void)         // 32-bit little-endian
+{
+    return GETC() | ( GETC()<<8 ) | ( GETC()<<16 ) | ( GETC()<<24 );
+}
+
+// seek
+
+extern void SEEK(int d)
+{
+    int newPos = cur_buff_pos + d;
+    if (newPos < length && newPos >= 0)
+    {
+        cur_buff_pos = newPos;
+        return;
+    }
+    file_pos = rb->lseek(fd, (cur_buff_pos - length) + d, SEEK_CUR);
+    cur_buff_pos = length = 0;
+}
+
+extern void POS(int d)
+{
+    cur_buff_pos = length = 0;
+    file_pos = d;
+    rb->lseek(fd, d, SEEK_SET);
+}
+
+extern int TELL(void)
+{
+    return file_pos + cur_buff_pos - length;
+}
+
+// OPEN/CLOSE file
+
+extern void *OPEN(char *f)
+{
+    printf("Opening %s\n", f);
+    cur_buff_pos = length = file_pos = 0;
+    fd = rb->open(f,O_RDONLY);
+
+    if (  fd < 0 )
+    {
+        printf("Error opening %s\n", f);
+        return NULL;
+    }
+
+    return &fd;
+}
+
+extern int CLOSE(void)
+{
+    cur_buff_pos = length = file_pos = 0;
+    return rb->close(fd);
+}