Initial revision

[openjpeg.git] / libopenjpeg / raw.c

diff --git a/libopenjpeg/raw.c b/libopenjpeg/raw.c
new file mode 100644 (file)
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+++ b/libopenjpeg/raw.c
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+/*
+ * Copyright (c) 2002-2003, Antonin Descampe
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * 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.
+ */
+
+#include "raw.h"
+
+
+unsigned char raw_c;
+unsigned int raw_ct, raw_lenmax, raw_len;
+unsigned char *raw_bp;
+unsigned char *raw_start;
+unsigned char *raw_end;
+
+/* <summary> */
+/* Return the number of bytes already encoded. */
+/* </summary> */
+int raw_numbytes()
+{
+       return raw_bp - raw_start;
+}
+
+/* <summary> */
+/* Initialize raw-encoder. */
+/* </summary> */
+/* <param name="bp">Output buffer.</param> */
+void raw_init_enc(unsigned char *bp)
+{
+       raw_bp = bp - 1;
+       raw_c = 0;
+       raw_ct = 7;
+       raw_start = bp;
+}
+
+/* <summary> */
+/* Encode a symbol using the RAW-coder. */
+/* </summary> */
+/* <param name="d"> The symbol to be encoded (0 or 1).</param> */
+void raw_encode(int d)
+{
+       /*  raw_c+=d; */
+
+       raw_ct--;
+       raw_c += (d << raw_ct);
+
+       if (raw_ct == 0) {
+               raw_bp++;
+               *raw_bp = raw_c;
+               raw_ct = 7;
+               if (raw_c == 0xff) {
+                       raw_ct = 6;
+               }
+               raw_c = 0;
+       }
+       /*else 
+          {
+          raw_ct--;
+          raw_c<<=1;
+          } */
+}
+
+/* <summary> */
+/* Flush encoded data. */
+/* </summary> */
+void raw_flush()
+{
+       char first = 1;
+       int prev = 1;
+       while (raw_ct != 7) {
+               raw_encode(first ? 0 : !(prev));
+               prev = first ? 0 : !(prev);
+               first = 0;
+       }
+}
+
+/* <summary> */
+/* Initialize raw-decoder. */
+/* </summary> */
+void raw_init_dec(unsigned char *bp, int len)
+{
+       raw_start = bp;
+       raw_lenmax = len;
+       raw_len = 0;
+       raw_c = 0;
+       raw_ct = 0;
+}
+
+/* <summary> */
+/* Decode a symbol using raw-decoder. Cfr p.506 TAUBMAN */
+/* </summary> */
+int raw_decode()
+{
+       int d;
+       if (raw_ct == 0) {
+               raw_ct = 8;
+               if (raw_len == raw_lenmax)
+                       raw_c = 0xff;
+               else {
+                       if (raw_c == 0xff)
+                               raw_ct = 7;
+                       raw_c = *(raw_start + raw_len);
+                       raw_len++;
+               }
+       }
+       raw_ct--;
+       d = (raw_c >> raw_ct) & 0x01;
+       return d;
+}