98 lines
3.2 KiB
C
98 lines
3.2 KiB
C
/*
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* Copyright (c) 1997-2006 Motoyuki Kasahara
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "build-pre.h"
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#include "eb.h"
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#include "error.h"
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#include "build-post.h"
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/*
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* Get a BCD (binary coded decimal) packed integer with 2 bytes
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* from an octet stream.
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*/
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unsigned
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eb_bcd2(const char *stream)
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{
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unsigned value;
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const unsigned char *s = (const unsigned char *)stream;
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value = ((*(s ) >> 4) & 0x0f) * 1000;
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value += ((*(s ) ) & 0x0f) * 100;
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value += ((*(s + 1) >> 4) & 0x0f) * 10;
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value += ((*(s + 1) ) & 0x0f);
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return value;
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}
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/*
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* Get a BCD (binary coded decimal) packed integer with 4 bytes
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* from an octet stream.
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*/
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unsigned
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eb_bcd4(const char *stream)
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{
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unsigned value;
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const unsigned char *s = (const unsigned char *)stream;
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value = ((*(s ) >> 4) & 0x0f) * 10000000;
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value += ((*(s ) ) & 0x0f) * 1000000;
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value += ((*(s + 1) >> 4) & 0x0f) * 100000;
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value += ((*(s + 1) ) & 0x0f) * 10000;
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value += ((*(s + 2) >> 4) & 0x0f) * 1000;
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value += ((*(s + 2) ) & 0x0f) * 100;
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value += ((*(s + 3) >> 4) & 0x0f) * 10;
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value += ((*(s + 3) ) & 0x0f);
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return value;
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}
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/*
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* Get a BCD (binary coded decimal) packed integer with 6 bytes
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* from an octet stream.
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*/
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unsigned
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eb_bcd6(const char *stream)
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{
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unsigned value;
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const unsigned char *s = (const unsigned char *)stream;
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value = ((*(s + 1) ) & 0x0f);
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value += ((*(s + 2) >> 4) & 0x0f) * 10;
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value += ((*(s + 2) ) & 0x0f) * 100;
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value += ((*(s + 3) >> 4) & 0x0f) * 1000;
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value += ((*(s + 3) ) & 0x0f) * 10000;
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value += ((*(s + 4) >> 4) & 0x0f) * 100000;
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value += ((*(s + 4) ) & 0x0f) * 1000000;
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value += ((*(s + 5) >> 4) & 0x0f) * 10000000;
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value += ((*(s + 5) ) & 0x0f) * 100000000;
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return value;
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}
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