146 lines
4.1 KiB
VimL
146 lines
4.1 KiB
VimL
" @Author: Tom Link (mailto:micathom AT gmail com?subject=[vim])
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" @License: GPL (see http://www.gnu.org/licenses/gpl.txt)
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" @Revision: 276
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if !exists('g:tlib#hash#use_crc32')
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let g:tlib#hash#use_crc32 = '' "{{{2
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endif
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if !exists('g:tlib#hash#use_adler32')
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let g:tlib#hash#use_adler32 = '' "{{{2
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endif
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function! tlib#hash#CRC32B(chars) "{{{3
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if !empty(g:tlib#hash#use_crc32)
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let use = g:tlib#hash#use_crc32
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elseif has('ruby')
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let use = 'ruby'
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else
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let use = 'vim'
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endif
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if exists('*tlib#hash#CRC32B_'. use)
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return tlib#hash#CRC32B_{use}(a:chars)
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else
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throw "Unknown version of tlib#hash#CRC32B: ". use
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endif
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endf
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function! tlib#hash#CRC32B_ruby(chars) "{{{3
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if has('ruby')
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let rv = ''
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if !exists('s:loaded_ruby_zlib')
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ruby require 'zlib'
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let s:loaded_ruby_zlib = 1
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endif
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ruby VIM::command('let rv = "%08X"' % Zlib.crc32(VIM::evaluate("a:chars")))
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return rv
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else
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throw "tlib#hash#CRC32B_ruby not supported in this version of vim"
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endif
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endf
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function! tlib#hash#CRC32B_vim(chars) "{{{3
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if !exists('s:crc_table')
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let cfile = tlib#persistent#Filename('tlib', 'crc_table', 1)
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let s:crc_table = tlib#persistent#Value(cfile, 'tlib#hash#CreateCrcTable', 0)
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endif
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let xFFFF_FFFF = repeat([1], 32)
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let crc = tlib#bitwise#XOR([0], xFFFF_FFFF, 'bits')
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for char in split(a:chars, '\zs')
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let octet = char2nr(char)
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let r1 = tlib#bitwise#ShiftRight(crc, 8)
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let i0 = tlib#bitwise#AND(crc, xFFFF_FFFF, 'bits')
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let i1 = tlib#bitwise#XOR(i0, octet, 'bits')
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let i2 = tlib#bitwise#Bits2Num(tlib#bitwise#AND(i1, 0xff, 'bits'))
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let r2 = s:crc_table[i2]
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let crc = tlib#bitwise#XOR(r1, r2, 'bits')
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endfor
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let crc = tlib#bitwise#XOR(crc, xFFFF_FFFF, 'bits')
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let rv = tlib#bitwise#Bits2Num(crc, 16)
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if len(rv) < 8
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let rv = repeat('0', 8 - len(rv)) . rv
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endif
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return rv
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endf
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" :nodoc:
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function! tlib#hash#CreateCrcTable() "{{{3
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let sum = 0.0
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for exponent in [0, 1, 2, 4, 5, 7, 8, 10, 11, 12, 16, 22, 23, 26, 32]
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let exp = tlib#bitwise#Bits2Num(repeat([0], 32 - exponent) + [1], 10.0)
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let sum += exp
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endfor
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let divisor = tlib#bitwise#Num2Bits(sum)
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let crc_table = []
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for octet in range(256)
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let remainder = tlib#bitwise#Num2Bits(octet)
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for i in range(8)
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if get(remainder, i) != 0
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let remainder = tlib#bitwise#XOR(remainder, tlib#bitwise#ShiftLeft(divisor, i), "bits")
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endif
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endfor
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let remainder = tlib#bitwise#ShiftRight(remainder, 8)
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call add(crc_table, remainder)
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endfor
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return crc_table
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endf
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function! tlib#hash#Adler32(chars) "{{{3
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if !empty(g:tlib#hash#use_adler32)
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let use = g:tlib#hash#use_adler32
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elseif exists('*or')
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let use = 'vim'
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else
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let use = 'tlib'
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endif
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if exists('*tlib#hash#Adler32_'. use)
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return tlib#hash#Adler32_{use}(a:chars)
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else
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throw "Unknown version of tlib#hash#Adler32_: ". use
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endif
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endf
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function! tlib#hash#Adler32_vim(chars) "{{{3
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if exists('*or')
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let mod_adler = 65521
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let a = 1
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let b = 0
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for index in range(len(a:chars))
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let c = char2nr(a:chars[index])
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let a = (a + c) % mod_adler
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let b = (b + a) % mod_adler
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endfor
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let bb = b * float2nr(pow(2, 16))
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let checksum = or(bb, a)
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" TLogVAR checksum, a, b, bb
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return printf("%08X", checksum)
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else
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throw "TLIB: Vim version doesn't support bitwise or()"
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endif
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endf
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function! tlib#hash#Adler32_tlib(chars) "{{{3
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let mod_adler = 65521
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let a = 1
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let b = 0
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for index in range(len(a:chars))
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let c = char2nr(a:chars[index])
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let a = (a + c) % mod_adler
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let b = (b + a) % mod_adler
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endfor
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let bb = tlib#bitwise#ShiftLeft(tlib#bitwise#Num2Bits(b), 16)
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let checksum = tlib#bitwise#OR(bb, a, "bits")
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return printf('%08s', tlib#bitwise#Bits2Num(checksum, 16))
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endf
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