WebSVN – tendra.SVN – Diff – /trunk/src/producers/common/output/decode.c

+/*
+ * Copyright (c) 2002-2006 The TenDRA Project <http://www.tendra.org/>.
+ * 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.
+ * 3. Neither the name of The TenDRA Project 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 HOLDERS 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.
+ *
+ * $Id$
+ */
 /*
     		 Crown Copyright (c) 1997
     This TenDRA(r) Computer Program is subject to Copyright
     owned by the United Kingdom Secretary of State for Defence
     acting through the Defence Evaluation and Research Agency
     (DERA).  It is made available to Recipients with a
     royalty-free licence for its use, reproduction, transfer
     to other parties and amendment for any purpose not excluding
     product development provided that any such use et cetera
     shall be deemed to be acceptance of the following conditions:-
         (1) Its Recipients shall ensure that this Notice is
         reproduced upon any copies or amended versions of it;
         (2) Any amended version of it shall be clearly marked to
         show both the nature of and the organisation responsible
         for the relevant amendment or amendments;
         (3) Its onward transfer from a recipient to another
         party shall be deemed to be that party's acceptance of
         these conditions;
         (4) DERA gives no warranty or assurance as to its
         quality or suitability for any purpose and DERA accepts
         no liability whatsoever in relation to any use to which
         it may be put.
 */
 /*
     FILL A BITSTREAM
     This routine fills the bitstream bs from its associated file.  It
     returns the number of bytes read.
 */
-static unsigned fill_bitstream
+static unsigned
-    PROTO_N ( ( bs ) )
-    PROTO_T ( BITSTREAM *bs )
+fill_bitstream(BITSTREAM *bs)
 {
-    unsigned sz ;
+	unsigned sz;
-    FILE *f = bs->file ;
+	FILE *f = bs->file;
-    string text = bs->text ;
+	string text = bs->text;
-    sz = ( unsigned ) fread ( ( gen_ptr ) text, sizeof ( character ),
+	sz = (unsigned)fread((gen_ptr)text, sizeof(character),
-			      ( size_t ) CHUNK_SIZE, f ) ;
+			     (size_t)CHUNK_SIZE, f);
-    if ( sz == 0 ) {
+	if (sz == 0) {
-	/* No more characters in file */
+		/* No more characters in file */
-	bs->link = ( gen_ptr ) text ;
+		bs->link = (gen_ptr)text;
-	while ( sz < CHUNK_SIZE ) {
+		while (sz < CHUNK_SIZE) {
-	    /* Fill buffer with all ones */
+			/* Fill buffer with all ones */
-	    text [ sz ] = ( character ) BYTE_MASK ;
+			text[sz] = (character)BYTE_MASK;
-	    sz++ ;
+			sz++;
-	}
+		}
-    }
+	}
-    bs->size = sz ;
+	bs->size = sz;
-    return ( sz ) ;
+	return (sz);
 }
 /*
     CHECK FOR END OF FILE
     This routine checks whether the end of the file associated with the
     bitstream bs has been precisely reached.  Note that the link field
     is set to a non-null value by fill_bitstream if the end of file is
     encountered.
 */
-int de_eof
+int
-    PROTO_N ( ( bs ) )
-    PROTO_T ( BITSTREAM *bs )
+de_eof(BITSTREAM *bs)
+{
-    if ( bs->link ) return ( 0 ) ;
+	if (bs->link) {
+		return (0);
+	}
-    if ( bs->bytes >= bs->size ) {
+	if (bs->bytes >= bs->size) {
-	IGNORE fill_bitstream ( bs ) ;
+		IGNORE fill_bitstream(bs);
-	if ( bs->link ) return ( 1 ) ;
+		if (bs->link) {
+			return (1);
-    }
+		}
+	}
-    return ( 0 ) ;
+	return (0);
+}
 /*
     TABLE OF BIT MASKS
     This array gives the bit masks for values up to 16 bits.
 */
-static unsigned long bit_mask [17] = {
+static unsigned long bit_mask[17] = {
 x0000,
 #if FS_NUMBER_SUFFIX
 x0001UL, 0x0003UL, 0x0007UL, 0x000fUL,
 x001fUL, 0x003fUL, 0x007fUL, 0x00ffUL,
 x01ffUL, 0x03ffUL, 0x07ffUL, 0x0fffUL,
 x1fffUL, 0x3fffUL, 0x7fffUL, 0xffffUL
 #else
 x0001, 0x0003, 0x0007, 0x000f,
 x001f, 0x003f, 0x007f, 0x00ff,
 x01ff, 0x03ff, 0x07ff, 0x0fff,
 x1fff, 0x3fff, 0x7fff, 0xffff
 #endif
-} ;
+};
 /*
     READ A NUMBER OF BITS FROM A BITSTREAM
     This routine reads the next n bits from the bitstream bs.  n will be
     at most 16.
 */
-unsigned de_bits
+unsigned
-    PROTO_N ( ( bs, n ) )
-    PROTO_T ( BITSTREAM *bs X unsigned n )
+de_bits(BITSTREAM *bs, unsigned n)
 {
-    unsigned long d = 0 ;
+	unsigned long d = 0;
-    string text = bs->text ;
+	string text = bs->text;
-    unsigned sz = bs->size ;
+	unsigned sz = bs->size;
-    unsigned bytes = bs->bytes ;
+	unsigned bytes = bs->bytes;
-    unsigned bits = 0 ;
+	unsigned bits = 0;
-    /* Build up result */
+	/* Build up result */
-    unsigned m = n + bs->bits ;
+	unsigned m = n + bs->bits;
-    while ( m ) {
+	while (m) {
-	unsigned b ;
+		unsigned b;
-	unsigned long c ;
+		unsigned long c;
-	/* Refill buffer from file if necessary */
+		/* Refill buffer from file if necessary */
-	if ( bytes >= sz ) {
+		if (bytes >= sz) {
-	    sz = fill_bitstream ( bs ) ;
+			sz = fill_bitstream(bs);
-	    bytes = 0 ;
+			bytes = 0;
+			bits = 0;
+		}
+		/* Get next character */
+		c = (unsigned long)text[bytes];
+		d = ((d << BYTE_SIZE) | c);
+		b = BYTE_SIZE - bits;
+		if (m < b) {
+			d >>= (b - m);
+			bits += m;
+			m = 0;
+		} else {
+			bits += b;
+			m -= b;
+		}
+		if (bits == BYTE_SIZE) {
-	    bits = 0 ;
+			bits = 0;
+			bytes++;
+		}
+	}
-	/* Get next character */
-	c = ( unsigned long ) text [ bytes ] ;
-	d = ( ( d << BYTE_SIZE ) | c ) ;
-	b = BYTE_SIZE - bits ;
-	if ( m < b ) {
-	    d >>= ( b - m ) ;
-	    bits += m ;
-	    m = 0 ;
-	} else {
-	    bits += b ;
-	    m -= b ;
-	}
-	if ( bits == BYTE_SIZE ) {
-	    bits = 0 ;
-	    bytes++ ;
-	}
-    }
-    bs->bytes = bytes ;
+	bs->bytes = bytes;
-    bs->bits = bits ;
+	bs->bits = bits;
-    d &= bit_mask [n] ;
+	d &= bit_mask[n];
-    return ( ( unsigned ) d ) ;
+	return ((unsigned)d);
+}
 /*
     READ A LARGE NUMBER OF BITS FROM A BITSTREAM
     This routine is identical to de_bits except that it works for up to
 bits.
 */
-unsigned long de_long_bits
-    PROTO_N ( ( bs, n ) )
-    PROTO_T ( BITSTREAM *bs X unsigned n )
-{
-    unsigned long a, b ;
-    if ( n > 16 ) {
-	a = ( unsigned long ) de_bits ( bs, n - 16 ) ;
-	n = 16 ;
-    } else {
-	a = 0 ;
-    }
-    b = ( unsigned long ) de_bits ( bs, n ) ;
-    return ( ( a << 16 ) | b ) ;
-}
-/*
-    READ AN INTEGER FROM A BITSTREAM
-    This routine reads an integer as a series of octal digits from the
-    bitstream bs.
-*/
-unsigned long de_int
+unsigned long
-    PROTO_N ( ( bs ) )
-    PROTO_T ( BITSTREAM *bs )
+de_long_bits(BITSTREAM *bs, unsigned n)
+{
-    unsigned long d, n = 0 ;
+	unsigned long a, b;
-    for ( ; ; ) {
+	if (n > 16) {
-	d = ( unsigned long ) de_bits ( bs, ( unsigned ) 4 ) ;
+		a = (unsigned long)de_bits(bs, n - 16);
+		n = 16;
-	if ( d & 0x8 ) break ;
+	} else {
-	n = ( ( n << 3 ) | d ) ;
+		a = 0;
-    }
+	}
-    n = ( ( n << 3 ) | ( d & 0x7 ) ) ;
+	b = (unsigned long)de_bits(bs, n);
-    return ( n ) ;
+	return ((a << 16) | b);
+}
 /*
+    READ AN INTEGER FROM A BITSTREAM
+    This routine reads an integer as a series of octal digits from the
+    bitstream bs.
+*/
+unsigned long
+de_int(BITSTREAM *bs)
+{
+	unsigned long d, n = 0;
+	for (;;) {
+		d = (unsigned long)de_bits(bs,(unsigned)4);
+		if (d & 0x8) {
+			break;
+		}
+		n = ((n << 3) | d);
+	}
+	n = ((n << 3) | (d & 0x7));
+	return (n);
+}
+/*
     ALIGN A BITSTREAM TO A BYTE BOUNDARY
     This routine reads enough bits from the bitstream bs to align it to
     the next byte boundary.
 */
-void de_boundary
+void
-    PROTO_N ( ( bs ) )
-    PROTO_T ( BITSTREAM *bs )
+de_boundary(BITSTREAM *bs)
 {
-    unsigned bits = bs->bits ;
+	unsigned bits = bs->bits;
+	if (bits) {
-    if ( bits ) IGNORE de_bits ( bs, BYTE_SIZE - bits ) ;
+		IGNORE de_bits(bs, BYTE_SIZE - bits);
+	}
-    return ;
+	return;
 }
 /*
     READ A STRING FROM A BITSTREAM
     This routine reads a string from the bitstream bs into the buffer bf.
 */
-void de_tdfstring
+void
-    PROTO_N ( ( bs, bf ) )
-    PROTO_T ( BITSTREAM *bs X BUFFER *bf )
+de_tdfstring(BITSTREAM *bs, BUFFER *bf)
+{
-    unsigned m = ( unsigned ) de_int ( bs ) ;
+	unsigned m = (unsigned)de_int(bs);
-    unsigned long n = de_int ( bs ) ;
+	unsigned long n = de_int(bs);
-    string p = stretch_buffer ( bf, bf->posn, ( gen_size ) n ) ;
+	string p = stretch_buffer(bf, bf->posn,(gen_size)n);
-    bf->posn = p + n ;
+	bf->posn = p + n;
-    while ( n ) {
+	while (n) {
-	int ch = CHAR_SIMPLE ;
+		int ch = CHAR_SIMPLE;
-	unsigned long c = ( unsigned long ) de_bits ( bs, m ) ;
+		unsigned long c = (unsigned long)de_bits(bs, m);
-	c = from_ascii ( c, &ch ) ;
+		c = from_ascii(c, &ch);
-	*( p++ ) = ( character ) c ;
+		*(p++) = (character)c;
-	n-- ;
+		n--;
-    }
+	}
-    *p = 0 ;
+	*p = 0;
-    return ;
+	return;
+}

Subversion Repositories tendra.SVN

(root)/trunk/src/producers/common/output/decode.c – Rev 2 → 7