diff options
author | Patrick Georgi <patrick.georgi@coresystems.de> | 2009-09-14 13:29:27 +0000 |
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committer | Patrick Georgi <patrick.georgi@coresystems.de> | 2009-09-14 13:29:27 +0000 |
commit | b7b56dd8fbe123958e196f396dab5ff3000b68dd (patch) | |
tree | 19972cda7bd87504eeea26ed90535e4aa7585da4 /util/cbfstool/lzma/C/7zip/Compress/RangeCoder/RangeCoder.h | |
parent | c8d4a05f8f5df06bd98f8ee7d5ef46e61986e6b0 (diff) |
New cbfstool. Works without mmap or fork/exec and
supports fixed location files. Some parts are salvaged
from the pre-commit version (esp. stage and payload creation),
others are completely rewritten (eg. the main loop that handles
file addition)
Also adapt newconfig (we don't need cbfs/tools anymore) and fix
some minor issues in the cbfstool-README.
Signed-off-by: Patrick Georgi <patrick.georgi@coresystems.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4630 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'util/cbfstool/lzma/C/7zip/Compress/RangeCoder/RangeCoder.h')
-rw-r--r-- | util/cbfstool/lzma/C/7zip/Compress/RangeCoder/RangeCoder.h | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/util/cbfstool/lzma/C/7zip/Compress/RangeCoder/RangeCoder.h b/util/cbfstool/lzma/C/7zip/Compress/RangeCoder/RangeCoder.h new file mode 100644 index 0000000000..bbb2ba82d3 --- /dev/null +++ b/util/cbfstool/lzma/C/7zip/Compress/RangeCoder/RangeCoder.h @@ -0,0 +1,205 @@ +// Compress/RangeCoder/RangeCoder.h + +#ifndef __COMPRESS_RANGECODER_H +#define __COMPRESS_RANGECODER_H + +#include "../../Common/InBuffer.h" +#include "../../Common/OutBuffer.h" + +namespace NCompress { +namespace NRangeCoder { + +const int kNumTopBits = 24; +const UInt32 kTopValue = (1 << kNumTopBits); + +class CEncoder +{ + UInt32 _cacheSize; + Byte _cache; +public: + UInt64 Low; + UInt32 Range; + COutBuffer Stream; + bool Create(UInt32 bufferSize) { return Stream.Create(bufferSize); } + + void SetStream(ISequentialOutStream *stream) { Stream.SetStream(stream); } + void Init() + { + Stream.Init(); + Low = 0; + Range = 0xFFFFFFFF; + _cacheSize = 1; + _cache = 0; + } + + void FlushData() + { + // Low += 1; + for(int i = 0; i < 5; i++) + ShiftLow(); + } + + HRESULT FlushStream() { return Stream.Flush(); } + + void ReleaseStream() { Stream.ReleaseStream(); } + + void Encode(UInt32 start, UInt32 size, UInt32 total) + { + Low += start * (Range /= total); + Range *= size; + while (Range < kTopValue) + { + Range <<= 8; + ShiftLow(); + } + } + + void ShiftLow() + { + if ((UInt32)Low < (UInt32)0xFF000000 || (int)(Low >> 32) != 0) + { + Byte temp = _cache; + do + { + Stream.WriteByte((Byte)(temp + (Byte)(Low >> 32))); + temp = 0xFF; + } + while(--_cacheSize != 0); + _cache = (Byte)((UInt32)Low >> 24); + } + _cacheSize++; + Low = (UInt32)Low << 8; + } + + void EncodeDirectBits(UInt32 value, int numTotalBits) + { + for (int i = numTotalBits - 1; i >= 0; i--) + { + Range >>= 1; + if (((value >> i) & 1) == 1) + Low += Range; + if (Range < kTopValue) + { + Range <<= 8; + ShiftLow(); + } + } + } + + void EncodeBit(UInt32 size0, UInt32 numTotalBits, UInt32 symbol) + { + UInt32 newBound = (Range >> numTotalBits) * size0; + if (symbol == 0) + Range = newBound; + else + { + Low += newBound; + Range -= newBound; + } + while (Range < kTopValue) + { + Range <<= 8; + ShiftLow(); + } + } + + UInt64 GetProcessedSize() { return Stream.GetProcessedSize() + _cacheSize + 4; } +}; + +class CDecoder +{ +public: + CInBuffer Stream; + UInt32 Range; + UInt32 Code; + bool Create(UInt32 bufferSize) { return Stream.Create(bufferSize); } + + void Normalize() + { + while (Range < kTopValue) + { + Code = (Code << 8) | Stream.ReadByte(); + Range <<= 8; + } + } + + void SetStream(ISequentialInStream *stream) { Stream.SetStream(stream); } + void Init() + { + Stream.Init(); + Code = 0; + Range = 0xFFFFFFFF; + for(int i = 0; i < 5; i++) + Code = (Code << 8) | Stream.ReadByte(); + } + + void ReleaseStream() { Stream.ReleaseStream(); } + + UInt32 GetThreshold(UInt32 total) + { + return (Code) / ( Range /= total); + } + + void Decode(UInt32 start, UInt32 size) + { + Code -= start * Range; + Range *= size; + Normalize(); + } + + UInt32 DecodeDirectBits(int numTotalBits) + { + UInt32 range = Range; + UInt32 code = Code; + UInt32 result = 0; + for (int i = numTotalBits; i != 0; i--) + { + range >>= 1; + /* + result <<= 1; + if (code >= range) + { + code -= range; + result |= 1; + } + */ + UInt32 t = (code - range) >> 31; + code -= range & (t - 1); + result = (result << 1) | (1 - t); + + if (range < kTopValue) + { + code = (code << 8) | Stream.ReadByte(); + range <<= 8; + } + } + Range = range; + Code = code; + return result; + } + + UInt32 DecodeBit(UInt32 size0, UInt32 numTotalBits) + { + UInt32 newBound = (Range >> numTotalBits) * size0; + UInt32 symbol; + if (Code < newBound) + { + symbol = 0; + Range = newBound; + } + else + { + symbol = 1; + Code -= newBound; + Range -= newBound; + } + Normalize(); + return symbol; + } + + UInt64 GetProcessedSize() {return Stream.GetProcessedSize(); } +}; + +}} + +#endif |