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+/*
+ * Small jpeg decoder library (Internal header)
+ *
+ * Copyright (c) 2006, Luc Saillard <luc@saillard.org>
+ * Copyright (c) 2012 Intel Corporation.
+ * All rights reserved.
+ * 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 the author 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.
+ *
+ */
+
+
+#ifndef __TINYJPEG_INTERNAL_H_
+#define __TINYJPEG_INTERNAL_H_
+
+#include <setjmp.h>
+
+#define SANITY_CHECK 1
+
+struct jdec_private;
+
+#define HUFFMAN_BITS_SIZE 256
+
+#define HUFFMAN_TABLES 4
+#define COMPONENTS 4
+#define JPEG_MAX_WIDTH 2048
+#define JPEG_MAX_HEIGHT 2048
+
+enum std_markers {
+ DQT = 0xDB, /* Define Quantization Table */
+ SOF = 0xC0, /* Start of Frame (size information) */
+ DHT = 0xC4, /* Huffman Table */
+ SOI = 0xD8, /* Start of Image */
+ SOS = 0xDA, /* Start of Scan */
+ RST = 0xD0, /* Reset Marker d0 -> .. */
+ RST7 = 0xD7, /* Reset Marker .. -> d7 */
+ EOI = 0xD9, /* End of Image */
+ DRI = 0xDD, /* Define Restart Interval */
+ APP0 = 0xE0,
+};
+
+
+struct huffman_table
+{
+ /*bits and values*/
+ unsigned char bits[16];
+ unsigned char values[256];
+};
+
+struct component
+{
+ unsigned int Hfactor;
+ unsigned int Vfactor;
+ unsigned char quant_table_index;
+ unsigned int cid;
+};
+
+
+typedef void (*decode_MCU_fct) (struct jdec_private *priv);
+typedef void (*convert_colorspace_fct) (struct jdec_private *priv);
+
+struct jpeg_sos
+{
+ unsigned int nr_components;
+ struct {
+ unsigned int component_id;
+ unsigned int dc_selector;
+ unsigned int ac_selector;
+ }components[4];
+};
+
+struct jdec_private
+{
+ /* Public variables */
+ unsigned int width, height; /* Size of the image */
+
+ /* Private variables */
+ const unsigned char *stream_begin, *stream_end;
+ unsigned int stream_length;
+
+ const unsigned char *stream; /* Pointer to the current stream */
+
+ struct component component_infos[COMPONENTS];
+ unsigned int nf_components;
+ unsigned char Q_tables[COMPONENTS][64]; /* quantization tables, zigzag*/
+ unsigned char Q_tables_valid[COMPONENTS];
+ struct huffman_table HTDC[HUFFMAN_TABLES]; /* DC huffman tables */
+ unsigned char HTDC_valid[HUFFMAN_TABLES];
+ struct huffman_table HTAC[HUFFMAN_TABLES]; /* AC huffman tables */
+ unsigned char HTAC_valid[HUFFMAN_TABLES];
+ struct jpeg_sos cur_sos; /* current sos values*/
+ int default_huffman_table_initialized;
+ int restart_interval;
+};
+
+#endif
+