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97 lines
1.9 KiB
C
97 lines
1.9 KiB
C
/*
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Copyright (C) 2010 Alex Andreotti <alex.andreotti@gmail.com>
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This file is part of chmc.
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chmc is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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chmc is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with chmc. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef CHMC_ENCINT_H
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#define CHMC_ENCINT_H
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// 0x7f 127
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// 0x3fff 16383
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// 0x1fffff 2097151
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// 0xfffffff 268435455
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static inline int chmc_encint_len ( const UInt32 val ) {
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int len;
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// FIXME should support 64 bit?
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if ( val > 0xfffffffUL )
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len = 0; // overflow
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else if ( val > 0x1fffffUL )
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len = 4;
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else if ( val > 0x3fffUL )
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len = 3;
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else if ( val > 0x7fUL )
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len = 2;
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else
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len = 1;
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return len;
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}
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static inline int chmc_encint ( const UInt32 val, UChar *out ) {
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int len;
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UInt32 a;
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UChar *p, *l;
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// FIXME should support 64 bit?
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if ( ! out || val > 0xfffffffUL )
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return 0; // FIXME can't handle, overflow
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if ( val > 0x1fffffUL )
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len = 4;
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else if ( val > 0x3fffUL )
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len = 3;
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else if ( val > 0x7fUL )
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len = 2;
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else
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len = 1;
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a = val;
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l = p = out + (len - 1);
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while ( p >= out ) {
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*p = (a & 0x7fUL);
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if ( p < l )
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*p |= 0x80UL;
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p--;
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a >>= 7;
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}
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return len;
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}
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static inline int chmc_decint ( const UChar *in, UInt32 *value ) {
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int len;
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len = 0;
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*value = 0;
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while ( (in[len] & 0x80) && (len < 3) ) {
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*value <<= 7;
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*value |= in[len] & 0x7f;
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len++;
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}
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*value <<= 7;
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*value |= in[len] & 0x7f;
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len++;
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return len;
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}
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#endif /* CHMC_ENCINT_H */
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