289 lines
11 KiB
C
289 lines
11 KiB
C
/**
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* WinPR: Windows Portable Runtime
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* BitStream
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*
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* Copyright 2014 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <winpr/print.h>
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#include <winpr/bitstream.h>
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#include "../trio/trio.h"
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const char* BYTE_BIT_STRINGS_LSB[256] = {
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"00000000", "00000001", "00000010", "00000011", "00000100", "00000101", "00000110", "00000111",
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"00001000", "00001001", "00001010", "00001011", "00001100", "00001101", "00001110", "00001111",
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"00010000", "00010001", "00010010", "00010011", "00010100", "00010101", "00010110", "00010111",
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"00011000", "00011001", "00011010", "00011011", "00011100", "00011101", "00011110", "00011111",
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"00100000", "00100001", "00100010", "00100011", "00100100", "00100101", "00100110", "00100111",
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"00101000", "00101001", "00101010", "00101011", "00101100", "00101101", "00101110", "00101111",
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"00110000", "00110001", "00110010", "00110011", "00110100", "00110101", "00110110", "00110111",
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"00111000", "00111001", "00111010", "00111011", "00111100", "00111101", "00111110", "00111111",
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"01000000", "01000001", "01000010", "01000011", "01000100", "01000101", "01000110", "01000111",
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"01001000", "01001001", "01001010", "01001011", "01001100", "01001101", "01001110", "01001111",
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"01010000", "01010001", "01010010", "01010011", "01010100", "01010101", "01010110", "01010111",
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"01011000", "01011001", "01011010", "01011011", "01011100", "01011101", "01011110", "01011111",
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"01100000", "01100001", "01100010", "01100011", "01100100", "01100101", "01100110", "01100111",
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"01101000", "01101001", "01101010", "01101011", "01101100", "01101101", "01101110", "01101111",
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"01110000", "01110001", "01110010", "01110011", "01110100", "01110101", "01110110", "01110111",
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"01111000", "01111001", "01111010", "01111011", "01111100", "01111101", "01111110", "01111111",
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"10000000", "10000001", "10000010", "10000011", "10000100", "10000101", "10000110", "10000111",
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"10001000", "10001001", "10001010", "10001011", "10001100", "10001101", "10001110", "10001111",
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"10010000", "10010001", "10010010", "10010011", "10010100", "10010101", "10010110", "10010111",
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"10011000", "10011001", "10011010", "10011011", "10011100", "10011101", "10011110", "10011111",
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"10100000", "10100001", "10100010", "10100011", "10100100", "10100101", "10100110", "10100111",
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"10101000", "10101001", "10101010", "10101011", "10101100", "10101101", "10101110", "10101111",
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"10110000", "10110001", "10110010", "10110011", "10110100", "10110101", "10110110", "10110111",
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"10111000", "10111001", "10111010", "10111011", "10111100", "10111101", "10111110", "10111111",
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"11000000", "11000001", "11000010", "11000011", "11000100", "11000101", "11000110", "11000111",
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"11001000", "11001001", "11001010", "11001011", "11001100", "11001101", "11001110", "11001111",
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"11010000", "11010001", "11010010", "11010011", "11010100", "11010101", "11010110", "11010111",
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"11011000", "11011001", "11011010", "11011011", "11011100", "11011101", "11011110", "11011111",
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"11100000", "11100001", "11100010", "11100011", "11100100", "11100101", "11100110", "11100111",
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"11101000", "11101001", "11101010", "11101011", "11101100", "11101101", "11101110", "11101111",
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"11110000", "11110001", "11110010", "11110011", "11110100", "11110101", "11110110", "11110111",
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"11111000", "11111001", "11111010", "11111011", "11111100", "11111101", "11111110", "11111111"
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};
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const char* BYTE_BIT_STRINGS_MSB[256] = {
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"00000000", "10000000", "01000000", "11000000", "00100000", "10100000", "01100000", "11100000",
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"00010000", "10010000", "01010000", "11010000", "00110000", "10110000", "01110000", "11110000",
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"00001000", "10001000", "01001000", "11001000", "00101000", "10101000", "01101000", "11101000",
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"00011000", "10011000", "01011000", "11011000", "00111000", "10111000", "01111000", "11111000",
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"00000100", "10000100", "01000100", "11000100", "00100100", "10100100", "01100100", "11100100",
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"00010100", "10010100", "01010100", "11010100", "00110100", "10110100", "01110100", "11110100",
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"00001100", "10001100", "01001100", "11001100", "00101100", "10101100", "01101100", "11101100",
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"00011100", "10011100", "01011100", "11011100", "00111100", "10111100", "01111100", "11111100",
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"00000010", "10000010", "01000010", "11000010", "00100010", "10100010", "01100010", "11100010",
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"00010010", "10010010", "01010010", "11010010", "00110010", "10110010", "01110010", "11110010",
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"00001010", "10001010", "01001010", "11001010", "00101010", "10101010", "01101010", "11101010",
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"00011010", "10011010", "01011010", "11011010", "00111010", "10111010", "01111010", "11111010",
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"00000110", "10000110", "01000110", "11000110", "00100110", "10100110", "01100110", "11100110",
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"00010110", "10010110", "01010110", "11010110", "00110110", "10110110", "01110110", "11110110",
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"00001110", "10001110", "01001110", "11001110", "00101110", "10101110", "01101110", "11101110",
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"00011110", "10011110", "01011110", "11011110", "00111110", "10111110", "01111110", "11111110",
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"00000001", "10000001", "01000001", "11000001", "00100001", "10100001", "01100001", "11100001",
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"00010001", "10010001", "01010001", "11010001", "00110001", "10110001", "01110001", "11110001",
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"00001001", "10001001", "01001001", "11001001", "00101001", "10101001", "01101001", "11101001",
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"00011001", "10011001", "01011001", "11011001", "00111001", "10111001", "01111001", "11111001",
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"00000101", "10000101", "01000101", "11000101", "00100101", "10100101", "01100101", "11100101",
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"00010101", "10010101", "01010101", "11010101", "00110101", "10110101", "01110101", "11110101",
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"00001101", "10001101", "01001101", "11001101", "00101101", "10101101", "01101101", "11101101",
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"00011101", "10011101", "01011101", "11011101", "00111101", "10111101", "01111101", "11111101",
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"00000011", "10000011", "01000011", "11000011", "00100011", "10100011", "01100011", "11100011",
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"00010011", "10010011", "01010011", "11010011", "00110011", "10110011", "01110011", "11110011",
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"00001011", "10001011", "01001011", "11001011", "00101011", "10101011", "01101011", "11101011",
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"00011011", "10011011", "01011011", "11011011", "00111011", "10111011", "01111011", "11111011",
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"00000111", "10000111", "01000111", "11000111", "00100111", "10100111", "01100111", "11100111",
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"00010111", "10010111", "01010111", "11010111", "00110111", "10110111", "01110111", "11110111",
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"00001111", "10001111", "01001111", "11001111", "00101111", "10101111", "01101111", "11101111",
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"00011111", "10011111", "01011111", "11011111", "00111111", "10111111", "01111111", "11111111"
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};
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void BitDump(const char* tag, UINT32 level, const BYTE* buffer, UINT32 length, UINT32 flags)
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{
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DWORD i;
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int nbits;
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const char* str;
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const char** strs;
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char pbuffer[64 * 8 + 1];
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size_t pos = 0;
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strs = (flags & BITDUMP_MSB_FIRST) ? BYTE_BIT_STRINGS_MSB : BYTE_BIT_STRINGS_LSB;
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for (i = 0; i < length; i += 8)
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{
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str = strs[buffer[i / 8]];
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nbits = (length - i) > 8 ? 8 : (length - i);
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pos += trio_snprintf(&pbuffer[pos], length - pos, "%.*s ", nbits, str);
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if ((i % 64) == 0)
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{
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pos = 0;
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WLog_LVL(tag, level, "%s", pbuffer);
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}
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}
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if (i)
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WLog_LVL(tag, level, "%s ", pbuffer);
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}
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UINT32 ReverseBits32(UINT32 bits, UINT32 nbits)
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{
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UINT32 rbits = 0;
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do
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{
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rbits = (rbits | (bits & 1)) << 1;
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bits >>= 1;
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nbits--;
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} while (nbits > 0);
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rbits >>= 1;
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return rbits;
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}
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#if 0
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/**
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* These are the original functions from which the macros are derived.
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* Since it is much easier to develop and debug functions than macros,
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* we keep a copy here for later improvements and modifications.
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*/
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WINPR_API void BitStream_Prefetch(wBitStream* bs);
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WINPR_API void BitStream_Fetch(wBitStream* bs);
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WINPR_API void BitStream_Flush(wBitStream* bs);
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WINPR_API void BitStream_Shift(wBitStream* bs, UINT32 nbits);
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WINPR_API void BitStream_Write_Bits(wBitStream* bs, UINT32 bits, UINT32 nbits);
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void BitStream_Prefetch(wBitStream* bs)
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{
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(bs->prefetch) = 0;
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if ((bs->pointer - bs->buffer) < (bs->capacity + 4))
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(bs->prefetch) |= (*(bs->pointer + 4) << 24);
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if ((bs->pointer - bs->buffer) < (bs->capacity + 5))
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(bs->prefetch) |= (*(bs->pointer + 5) << 16);
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if ((bs->pointer - bs->buffer) < (bs->capacity + 6))
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(bs->prefetch) |= (*(bs->pointer + 6) << 8);
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if ((bs->pointer - bs->buffer) < (bs->capacity + 7))
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(bs->prefetch) |= (*(bs->pointer + 7) << 0);
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}
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void BitStream_Fetch(wBitStream* bs)
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{
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(bs->accumulator) = 0;
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if ((bs->pointer - bs->buffer) < (bs->capacity + 0))
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(bs->accumulator) |= (*(bs->pointer + 0) << 24);
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if ((bs->pointer - bs->buffer) < (bs->capacity + 1))
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(bs->accumulator) |= (*(bs->pointer + 1) << 16);
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if ((bs->pointer - bs->buffer) < (bs->capacity + 2))
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(bs->accumulator) |= (*(bs->pointer + 2) << 8);
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if ((bs->pointer - bs->buffer) < (bs->capacity + 3))
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(bs->accumulator) |= (*(bs->pointer + 3) << 0);
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BitStream_Prefetch(bs);
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}
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void BitStream_Flush(wBitStream* bs)
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{
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if ((bs->pointer - bs->buffer) < (bs->capacity + 0))
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*(bs->pointer + 0) = (bs->accumulator >> 24);
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if ((bs->pointer - bs->buffer) < (bs->capacity + 1))
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*(bs->pointer + 1) = (bs->accumulator >> 16);
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if ((bs->pointer - bs->buffer) < (bs->capacity + 2))
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*(bs->pointer + 2) = (bs->accumulator >> 8);
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if ((bs->pointer - bs->buffer) < (bs->capacity + 3))
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*(bs->pointer + 3) = (bs->accumulator >> 0);
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}
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void BitStream_Shift(wBitStream* bs, UINT32 nbits)
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{
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bs->accumulator <<= nbits;
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bs->position += nbits;
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bs->offset += nbits;
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if (bs->offset < 32)
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{
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bs->mask = ((1 << nbits) - 1);
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bs->accumulator |= ((bs->prefetch >> (32 - nbits)) & bs->mask);
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bs->prefetch <<= nbits;
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}
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else
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{
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bs->mask = ((1 << nbits) - 1);
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bs->accumulator |= ((bs->prefetch >> (32 - nbits)) & bs->mask);
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bs->prefetch <<= nbits;
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bs->offset -= 32;
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bs->pointer += 4;
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BitStream_Prefetch(bs);
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if (bs->offset)
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{
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bs->mask = ((1 << bs->offset) - 1);
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bs->accumulator |= ((bs->prefetch >> (32 - bs->offset)) & bs->mask);
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bs->prefetch <<= bs->offset;
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}
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}
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}
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void BitStream_Write_Bits(wBitStream* bs, UINT32 bits, UINT32 nbits)
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{
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bs->position += nbits;
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bs->offset += nbits;
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if (bs->offset < 32)
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{
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bs->accumulator |= (bits << (32 - bs->offset));
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}
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else
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{
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bs->offset -= 32;
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bs->mask = ((1 << (nbits - bs->offset)) - 1);
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bs->accumulator |= ((bits >> bs->offset) & bs->mask);
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BitStream_Flush(bs);
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bs->accumulator = 0;
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bs->pointer += 4;
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if (bs->offset)
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{
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bs->mask = ((1 << bs->offset) - 1);
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bs->accumulator |= ((bits & bs->mask) << (32 - bs->offset));
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}
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}
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}
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#endif
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void BitStream_Attach(wBitStream* bs, const BYTE* buffer, UINT32 capacity)
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{
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bs->position = 0;
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bs->buffer = buffer;
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bs->offset = 0;
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bs->accumulator = 0;
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bs->pointer = (BYTE*)bs->buffer;
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bs->capacity = capacity;
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bs->length = bs->capacity * 8;
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}
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wBitStream* BitStream_New()
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{
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wBitStream* bs = NULL;
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bs = (wBitStream*)calloc(1, sizeof(wBitStream));
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return bs;
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}
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void BitStream_Free(wBitStream* bs)
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{
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if (!bs)
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return;
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free(bs);
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}
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