Initial revision

2003-11-27 10:10:17 +00:00
parent a8de4a648a
commit 2ad6a9770a
31 changed files with 8328 additions and 0 deletions
--- a/libopenjpeg/raw.c
+++ b/libopenjpeg/raw.c
@@ -0,0 +1,129 @@
+/*
+ * 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;
+}