68 lines
1.6 KiB
Bash
68 lines
1.6 KiB
Bash
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#!/bin/bash
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# Script to fix the crc of openldap slapd.d ldifs.
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do_update_crc () {
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if [ -z ${1} ]; then
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echo "Invalid call to do_update_crc() - no filename provided"
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exit 1
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fi
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tgt_ldif=$1
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if [ ! -f "${tgt_ldif}" ]; then
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echo "invalid call to do_update_crc() - file ${tgt_ldif} does not exist?"
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exit 1
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fi
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rm -f "${tgt_ldif}.crcbak"
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mv "${tgt_ldif}" "${tgt_ldif}.crcbak"
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/usr/bin/awk '
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BEGIN {
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# CRC-32 ZIP polynomial in reversed bit order.
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POLY = 0xedb88320
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# 8-bit character -> ordinal table.
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for (i = 0; i < 256; i++)
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ORD[sprintf("%c", i)] = i
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}
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{
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# Remember each input line.
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input[NR] = $0
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# Verify the file header.
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if (NR == 1 && $0 != "# AUTO-GENERATED FILE - DO NOT EDIT!! Use ldapmodify.")
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exit 1
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if (NR == 2 && $0 !~ /# CRC32 ......../)
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exit 1
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}
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# Calculate CRC-32.
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function crc32(crc, string, i, j, c) {
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crc = and(compl(crc), 0xffffffff)
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for (i = 1; i <= length(string); i++) {
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c = substr(string, i, 1)
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crc = xor(crc, ORD[c])
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for (j = 0; j < 8; j++)
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crc = and(crc, 1) ? xor(rshift(crc, 1), POLY) : rshift(crc, 1)
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}
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crc = and(compl(crc), 0xffffffff)
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return crc
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}
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END {
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# Calculate CRC-32 of the file and update it in the header.
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crc = 0
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for (i = 3; i <= length(input); i++)
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crc = crc32(crc, input[i] "\n")
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input[2] = "# CRC32 " sprintf("%08x", crc)
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# Print the output.
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for (i = 1; i <= length(input); i++)
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print input[i]
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}' "${tgt_ldif}.crcbak" > "${tgt_ldif}"
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}
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