diff options
Diffstat (limited to 'src/libs/7zip/win/CPP/7zip/Compress/ArjDecoder1.cpp')
| -rw-r--r-- | src/libs/7zip/win/CPP/7zip/Compress/ArjDecoder1.cpp | 309 |
1 files changed, 309 insertions, 0 deletions
diff --git a/src/libs/7zip/win/CPP/7zip/Compress/ArjDecoder1.cpp b/src/libs/7zip/win/CPP/7zip/Compress/ArjDecoder1.cpp new file mode 100644 index 000000000..2c354e1eb --- /dev/null +++ b/src/libs/7zip/win/CPP/7zip/Compress/ArjDecoder1.cpp @@ -0,0 +1,309 @@ +// ArjDecoder1.cpp + +#include "StdAfx.h" + +#include "ArjDecoder1.h" + +namespace NCompress{ +namespace NArj { +namespace NDecoder1 { + +static const UInt32 kHistorySize = 26624; +static const UInt32 kMatchMinLen = 3; +static const UInt32 kMatchMaxLen = 256; + +// static const UInt32 kNC = 255 + kMatchMaxLen + 2 - kMatchMinLen; + +void CCoder::MakeTable(int nchar, Byte *bitlen, int tablebits, + UInt32 *table, int tablesize) +{ + UInt32 count[17], weight[17], start[18], *p; + UInt32 i, k, len, ch, jutbits, avail, nextcode, mask; + + for (i = 1; i <= 16; i++) + count[i] = 0; + for (i = 0; (int)i < nchar; i++) + count[bitlen[i]]++; + + start[1] = 0; + for (i = 1; i <= 16; i++) + start[i + 1] = start[i] + (count[i] << (16 - i)); + if (start[17] != (UInt32) (1 << 16)) + throw "Data error"; + + jutbits = 16 - tablebits; + for (i = 1; (int)i <= tablebits; i++) + { + start[i] >>= jutbits; + weight[i] = 1 << (tablebits - i); + } + while (i <= 16) + { + weight[i] = 1 << (16 - i); + i++; + } + + i = start[tablebits + 1] >> jutbits; + if (i != (UInt32) (1 << 16)) + { + k = 1 << tablebits; + while (i != k) + table[i++] = 0; + } + + avail = nchar; + mask = 1 << (15 - tablebits); + for (ch = 0; (int)ch < nchar; ch++) + { + if ((len = bitlen[ch]) == 0) + continue; + k = start[len]; + nextcode = k + weight[len]; + if ((int)len <= tablebits) + { + if (nextcode > (UInt32)tablesize) + throw "Data error"; + for (i = start[len]; i < nextcode; i++) + table[i] = ch; + } + else + { + p = &table[k >> jutbits]; + i = len - tablebits; + while (i != 0) + { + if (*p == 0) + { + right[avail] = left[avail] = 0; + *p = avail++; + } + if (k & mask) + p = &right[*p]; + else + p = &left[*p]; + k <<= 1; + i--; + } + *p = ch; + } + start[len] = nextcode; + } +} + +void CCoder::read_pt_len(int nn, int nbit, int i_special) +{ + UInt32 n = m_InBitStream.ReadBits(nbit); + if (n == 0) + { + UInt32 c = m_InBitStream.ReadBits(nbit); + int i; + for (i = 0; i < nn; i++) + pt_len[i] = 0; + for (i = 0; i < 256; i++) + pt_table[i] = c; + } + else + { + UInt32 i = 0; + while (i < n) + { + UInt32 bitBuf = m_InBitStream.GetValue(16); + int c = bitBuf >> 13; + if (c == 7) + { + UInt32 mask = 1 << (12); + while (mask & bitBuf) + { + mask >>= 1; + c++; + } + } + m_InBitStream.MovePos((c < 7) ? 3 : (int)(c - 3)); + pt_len[i++] = (Byte)c; + if (i == (UInt32)i_special) + { + c = m_InBitStream.ReadBits(2); + while (--c >= 0) + pt_len[i++] = 0; + } + } + while (i < (UInt32)nn) + pt_len[i++] = 0; + MakeTable(nn, pt_len, 8, pt_table, PTABLESIZE); + } +} + +void CCoder::read_c_len() +{ + int i, c, n; + UInt32 mask; + + n = m_InBitStream.ReadBits(CBIT); + if (n == 0) + { + c = m_InBitStream.ReadBits(CBIT); + for (i = 0; i < NC; i++) + c_len[i] = 0; + for (i = 0; i < CTABLESIZE; i++) + c_table[i] = c; + } + else + { + i = 0; + while (i < n) + { + UInt32 bitBuf = m_InBitStream.GetValue(16); + c = pt_table[bitBuf >> (8)]; + if (c >= NT) + { + mask = 1 << (7); + do + { + if (bitBuf & mask) + c = right[c]; + else + c = left[c]; + mask >>= 1; + } while (c >= NT); + } + m_InBitStream.MovePos((int)(pt_len[c])); + if (c <= 2) + { + if (c == 0) + c = 1; + else if (c == 1) + c = m_InBitStream.ReadBits(4) + 3; + else + c = m_InBitStream.ReadBits(CBIT) + 20; + while (--c >= 0) + c_len[i++] = 0; + } + else + c_len[i++] = (Byte)(c - 2); + } + while (i < NC) + c_len[i++] = 0; + MakeTable(NC, c_len, 12, c_table, CTABLESIZE); + } +} + +UInt32 CCoder::decode_c() +{ + UInt32 j, mask; + UInt32 bitbuf = m_InBitStream.GetValue(16); + j = c_table[bitbuf >> 4]; + if (j >= NC) + { + mask = 1 << (3); + do + { + if (bitbuf & mask) + j = right[j]; + else + j = left[j]; + mask >>= 1; + } while (j >= NC); + } + m_InBitStream.MovePos((int)(c_len[j])); + return j; +} + +UInt32 CCoder::decode_p() +{ + UInt32 j, mask; + UInt32 bitbuf = m_InBitStream.GetValue(16); + j = pt_table[bitbuf >> (8)]; + if (j >= NP) + { + mask = 1 << (7); + do + { + if (bitbuf & mask) + j = right[j]; + else + j = left[j]; + mask >>= 1; + } while (j >= NP); + } + m_InBitStream.MovePos((int)(pt_len[j])); + if (j != 0) + { + j--; + j = (1 << j) + m_InBitStream.ReadBits((int)j); + } + return j; +} + + +HRESULT CCoder::CodeReal(ISequentialInStream *inStream, ISequentialOutStream *outStream, + const UInt64 * /* inSize */, const UInt64 *outSize, ICompressProgressInfo *progress) +{ + if (outSize == NULL) + return E_INVALIDARG; + + if (!m_OutWindowStream.Create(kHistorySize)) + return E_OUTOFMEMORY; + if (!m_InBitStream.Create(1 << 20)) + return E_OUTOFMEMORY; + + // check it + for (int i = 0; i < CTABLESIZE; i++) + c_table[i] = 0; + + UInt64 pos = 0; + m_OutWindowStream.SetStream(outStream); + m_OutWindowStream.Init(false); + m_InBitStream.SetStream(inStream); + m_InBitStream.Init(); + + CCoderReleaser coderReleaser(this); + + UInt32 blockSize = 0; + + while(pos < *outSize) + { + if (blockSize == 0) + { + if (progress != NULL) + { + UInt64 packSize = m_InBitStream.GetProcessedSize(); + RINOK(progress->SetRatioInfo(&packSize, &pos)); + } + blockSize = m_InBitStream.ReadBits(16); + read_pt_len(NT, TBIT, 3); + read_c_len(); + read_pt_len(NP, PBIT, -1); + } + blockSize--; + + UInt32 number = decode_c(); + if (number < 256) + { + m_OutWindowStream.PutByte((Byte)number); + pos++; + continue; + } + else + { + UInt32 len = number - 256 + kMatchMinLen; + UInt32 distance = decode_p(); + if (distance >= pos) + return S_FALSE; + m_OutWindowStream.CopyBlock(distance, len); + pos += len; + } + } + coderReleaser.NeedFlush = false; + return m_OutWindowStream.Flush(); +} + +STDMETHODIMP CCoder::Code(ISequentialInStream *inStream, ISequentialOutStream *outStream, + const UInt64 *inSize, const UInt64 *outSize, ICompressProgressInfo *progress) +{ + try { return CodeReal(inStream, outStream, inSize, outSize, progress);} + catch(const CInBufferException &e) { return e.ErrorCode; } + catch(const CLzOutWindowException &e) { return e.ErrorCode; } + catch(...) { return S_FALSE; } +} + +}}} |