1 files changed, 86 insertions, 0 deletions
diff --git a/client/glz_decoder.h b/client/glz_decoder.h
new file mode 100644
index 00000000..98c15754
--- /dev/null
+++ b/client/glz_decoder.h
@@ -0,0 +1,86 @@
+/*
+   Copyright (C) 2009 Red Hat, Inc.
+
+   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; either version 2 of
+   the License, or (at your option) any later version.
+
+   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 _H_GLZ_DECODER
+#define _H_GLZ_DECODER
+
+#include "lz_common.h"
+#include "glz_decoder_config.h"
+#include "glz_decoder_window.h"
+#include "draw.h"
+
+
+
+class GlzDecodeHandler {
+public:
+    GlzDecodeHandler() {}
+    virtual ~GlzDecodeHandler() {}
+
+    /* Called by the decoder before the image decoding is starts. The
+       user of the decoder should create GlzDecodedImage instance.
+       If resources should be released when the image exits the Glz window,
+       it should be handled in the instance dtor.
+
+       opaque_usr_info: the data sent when GlzDecoder::decode was called
+       gross_pixels   : number of pixels when considering the whole stride*/
+    virtual GlzDecodedImage *alloc_image(void *opaque_usr_info, uint64_t image_id,
+                                         uint64_t image_win_head_id, LzImageType type,
+                                         int width, int height, int gross_pixels,
+                                         int n_bytes_per_pixel, bool top_down) = 0;
+};
+
+/*
+    This class implements the lz decoding algorithm
+*/
+
+class GlzDecoder {
+public:
+
+    GlzDecoder(GlzDecoderWindow &images_window, GlzDecodeHandler &usr_handler,
+               GlzDecoderDebug &debug_calls);
+    virtual ~GlzDecoder();
+
+    /* Decodes the data and afterwards  calls GlzDecodeHandler::handle_decoded_image */
+    void decode(uint8_t *data, Palette *palette, void *opaque_usr_info);
+
+private:
+    void decode_header();
+    uint32_t decode_32();
+    uint64_t decode_64();
+
+private:
+    GlzDecoderWindow &_images_window;
+    GlzDecodeHandler &_usr_handler;
+    GlzDecoderDebug  &_debug_calls;
+
+    uint8_t *_in_now;
+    uint8_t *_in_start;
+
+    struct {
+        uint64_t id;
+        LzImageType type;
+        int width;
+        int height;
+        int gross_pixels;
+        bool top_down;
+        int win_head_dist;
+        uint8_t *data;
+    } _image;
+};
+
+#endif // _H_GLZ_DECODER
+