diff options
Diffstat (limited to 'crypto/bzip2/src/CBZip2OutputStream.cs')
| -rw-r--r-- | crypto/bzip2/src/CBZip2OutputStream.cs | 123 |
1 files changed, 44 insertions, 79 deletions
diff --git a/crypto/bzip2/src/CBZip2OutputStream.cs b/crypto/bzip2/src/CBZip2OutputStream.cs index 156c32e3e..ee3eeaed0 100644 --- a/crypto/bzip2/src/CBZip2OutputStream.cs +++ b/crypto/bzip2/src/CBZip2OutputStream.cs @@ -617,19 +617,10 @@ namespace Org.BouncyCastle.Apache.Bzip2 private void SendMtfValues() { - byte[][] len = InitByteArray(BZip2Constants.N_GROUPS, BZip2Constants.MAX_ALPHA_SIZE); int v, t, i, j, bt, bc, iter; int alphaSize = nInUse + 2; - for (t = 0; t < BZip2Constants.N_GROUPS; t++) - { - byte[] len_t = len[t]; - for (v = 0; v < alphaSize; v++) - { - len_t[v] = GREATER_ICOST; - } - } /* Decide how many coding tables to use */ if (nMTF <= 0) @@ -657,6 +648,12 @@ namespace Org.BouncyCastle.Apache.Bzip2 nGroups = 6; } + byte[][] len = CreateByteArray(nGroups, alphaSize); + for (t = 0; t < nGroups; t++) + { + Arrays.Fill(len[t], GREATER_ICOST); + } + /* Generate an initial set of coding tables */ { int nPart = nGroups; @@ -698,12 +695,6 @@ namespace Org.BouncyCastle.Apache.Bzip2 int[][] rfreq = CBZip2InputStream.CreateIntArray(BZip2Constants.N_GROUPS, BZip2Constants.MAX_ALPHA_SIZE); int[] fave = new int[BZip2Constants.N_GROUPS]; short[] cost = new short[BZip2Constants.N_GROUPS]; - byte[] len_0 = len[0]; - byte[] len_1 = len[1]; - byte[] len_2 = len[2]; - byte[] len_3 = len[3]; - byte[] len_4 = len[4]; - byte[] len_5 = len[5]; // Iterate up to N_ITERS times to improve the tables. int nSelectors = 0; @@ -734,6 +725,7 @@ namespace Org.BouncyCastle.Apache.Bzip2 if (nGroups == 6) { + byte[] len_0 = len[0], len_1 = len[1], len_2 = len[2], len_3 = len[3], len_4 = len[4], len_5 = len[5]; short cost0 = 0, cost1 = 0, cost2 = 0, cost3 = 0, cost4 = 0, cost5 = 0; for (i = gs; i <= ge; i++) @@ -874,25 +866,20 @@ namespace Org.BouncyCastle.Apache.Bzip2 BsPutBitsSmall(3, nGroups); BsPutBits(15, nSelectors); { - byte[] pos = new byte[BZip2Constants.N_GROUPS]; - for (i = 0; i < nGroups; i++) - { - pos[i] = (byte)i; - } + int mtfSelectors = 0x00654321; for (i = 0; i < nSelectors; i++) { - // Compute MTF values for the selector. - byte ll_i = m_selectors[i]; - int mtfSelector = 1; - byte tmp = pos[0]; - while (ll_i != tmp) + // Compute MTF value for the selector. + int ll_i = m_selectors[i]; + int bitPos = ll_i << 2; + int mtfSelector = (mtfSelectors >> bitPos) & 0xF; + + if (mtfSelector != 1) { - byte tmp2 = tmp; - tmp = pos[mtfSelector]; - pos[mtfSelector++] = tmp2; + int mtfIncMask = (0x00888888 - mtfSelectors + 0x00111111 * mtfSelector) & 0x00888888; + mtfSelectors = mtfSelectors - (mtfSelector << bitPos) + (mtfIncMask >> 3); } - pos[0] = tmp; BsPutBitsSmall(mtfSelector, (1 << mtfSelector) - 2); } @@ -1543,10 +1530,7 @@ namespace Org.BouncyCastle.Apache.Bzip2 private void GenerateMtfValues() { byte[] yy = new byte[256]; - int i, j; - int zPend; - int wr; - int EOB; + int i; nInUse = 0; @@ -1558,79 +1542,60 @@ namespace Org.BouncyCastle.Apache.Bzip2 } } - EOB = nInUse + 1; + int EOB = nInUse + 1; for (i = 0; i <= EOB; i++) { mtfFreq[i] = 0; } - wr = 0; - zPend = 0; for (i = 0; i < nInUse; i++) { yy[i] = (byte)i; } + int j, wr = 0, zPend = 0; for (i = 0; i < count; i++) { byte ll_i = unseqToSeq[blockBytes[zptr[i]]]; - j = 0; - { - byte tmp = yy[j]; - while (ll_i != tmp) - { - j++; - byte tmp2 = tmp; - tmp = yy[j]; - yy[j] = tmp2; - } - yy[0] = tmp; - } - - if (j == 0) + byte tmp = yy[0]; + if (ll_i == tmp) { zPend++; continue; } - if (zPend > 0) + int sym = 1; + do { - zPend--; - while (true) - { - // BZip2Constants.RUNA or BZip2Constants.RUNB - int run = zPend & 1; - szptr[wr++] = run; - mtfFreq[run]++; - - if (zPend < 2) - break; - - zPend = (zPend - 2) / 2; - } - zPend = 0; + byte tmp2 = tmp; + tmp = yy[sym]; + yy[sym++] = tmp2; } - szptr[wr++] = j + 1; - mtfFreq[j + 1]++; - } + while (ll_i != tmp); + yy[0] = tmp; - if (zPend > 0) - { - zPend--; - while (true) + while (zPend > 0) { - // BZip2Constants.RUNA or BZip2Constants.RUNB - int run = zPend & 1; + // RUNA or RUNB + int run = --zPend & 1; szptr[wr++] = run; mtfFreq[run]++; + zPend >>= 1; + } - if (zPend < 2) - break; + szptr[wr++] = sym; + mtfFreq[sym]++; + } - zPend = (zPend - 2) / 2; - } + while (zPend > 0) + { + // RUNA or RUNB + int run = --zPend & 1; + szptr[wr++] = run; + mtfFreq[run]++; + zPend >>= 1; } szptr[wr++] = EOB; @@ -1639,7 +1604,7 @@ namespace Org.BouncyCastle.Apache.Bzip2 nMTF = wr; } - internal static byte[][] InitByteArray(int n1, int n2) + internal static byte[][] CreateByteArray(int n1, int n2) { byte[][] a = new byte[n1][]; for (int k = 0; k < n1; ++k) |