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86 lines
1.8 KiB
86 lines
1.8 KiB
3 years ago
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//
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// Part of the ht://Dig package <http://www.htdig.org/>
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// Copyright (c) 1999-2004 The ht://Dig Group
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// For copyright details, see the file COPYING in your distribution
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// or the GNU Library General Public License (LGPL) version 2 or later
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// <http://www.gnu.org/copyleft/lgpl.html>
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//
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#ifndef _ber_h
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#define _ber_h
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#include <stdio.h>
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#include <errno.h>
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typedef unsigned int ber_t;
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#define BER_MAX_BYTES (sizeof(ber_t) + 1)
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inline int ber_buf2value(const unsigned char* buf, int buf_len, ber_t& result) {
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result = 0;
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unsigned int bits = 0;
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int length = 1;
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while(*buf & 0x80) {
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if(bits > sizeof(ber_t) * 8) return EINVAL;
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result |= (*buf & 0x7f) << bits;
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bits += 7;
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buf++;
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length++;
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if(length > buf_len) return EINVAL;
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}
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result |= (*buf & 0x7f) << bits;
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return length;
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}
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inline int ber_file2value(FILE* fp, ber_t& result) {
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result = 0;
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unsigned int bits = 0;
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int c;
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int length = 1;
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while((c = fgetc(fp)) != EOF && (c & 0x80)) {
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if(bits > sizeof(ber_t) * 8) return EINVAL;
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result |= (c & 0x7f) << bits;
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bits += 7;
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length++;
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}
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if(c == EOF) return EINVAL;
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result |= (c & 0x7f) << bits;
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return length;
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}
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inline int ber_value2buf(unsigned char* buf, int buf_len, ber_t value)
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{
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if(buf_len <= 0) return EINVAL;
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int buf_idx = 0;
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buf[buf_idx++] = (value & 0x7f);
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while(value >>= 7) {
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if(buf_idx >= buf_len) return EINVAL;
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buf[buf_idx - 1] |= 0x80;
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buf[buf_idx++] = (value & 0x7f);
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}
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return buf_idx;
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}
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inline int ber_value2file(FILE* fp, ber_t value)
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{
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int length = 1;
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unsigned char current;
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current = (value & 0x7f);
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while(value >>= 7) {
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current |= 0x80;
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if(fputc(current, fp) == EOF) return EINVAL;
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current = (value & 0x7f);
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length++;
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}
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if(fputc(current, fp) == EOF) return EINVAL;
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return length;
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}
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#endif /* _ber_h */
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