132 lines
6.1 KiB
C++
132 lines
6.1 KiB
C++
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// File: lzham_lzdecompbase.cpp
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// See Copyright Notice and license at the end of include/lzham.h
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#include "lzham_core.h"
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#include "lzham_lzdecompbase.h"
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namespace lzham
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{
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// Keep in sync with LZHAM_DEFAULT_ADAPT_RATE, and LZHAM_DEFAULT_TABLE_UPDATE_RATE, etc.
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table_update_settings g_table_update_settings[] =
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{
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{ 4, 32 }, // crazy slow!
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{ 5, 33 },
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{ 6, 34 },
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{ 7, 35 },
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{ 8, 36 },
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{ 16, 48 },
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{ 32, 72 },
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{ 64, 64 }, // codec's internal default
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{ 98, 80 },
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{ 128, 96 },
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{ 192, 112 },
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{ 256, 128 },
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{ 512, 128+16*2 },
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{ 1024, 128+16*4 },
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{ 2048, 128+16*6 },
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{ 2048, 128+16*8 },
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{ 2048, 128+16*10 },
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{ 2048, 128+16*12 },
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{ 2048, 128+16*14 },
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{ 2048, 128+16*16 }
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};
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uint CLZDecompBase::m_lzx_position_base[CLZDecompBase::cLZXMaxPositionSlots] =
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{
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0x0, 0x1, 0x2, 0x3, 0x4, 0x6, 0x8, 0xC, 0x10, 0x18, 0x20, 0x30, 0x40, 0x60, 0x80, 0xC0,
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0x100, 0x180, 0x200, 0x300, 0x400, 0x600, 0x800, 0xC00, 0x1000, 0x1800, 0x2000, 0x3000, 0x4000, 0x6000, 0x8000, 0xC000,
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0x10000, 0x18000, 0x20000, 0x30000, 0x40000, 0x60000, 0x80000, 0xC0000, 0x100000, 0x180000, 0x200000, 0x300000, 0x400000, 0x600000, 0x800000, 0xC00000,
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0x1000000, 0x1800000, 0x2000000, 0x3000000, 0x4000000, 0x6000000, 0x8000000, 0xA000000, 0xC000000, 0xE000000, 0x10000000, 0x12000000, 0x14000000, 0x16000000, 0x18000000, 0x1A000000,
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0x1C000000, 0x1E000000, 0x20000000, 0x22000000, 0x24000000, 0x26000000, 0x28000000, 0x2A000000, 0x2C000000, 0x2E000000, 0x30000000, 0x32000000, 0x34000000, 0x36000000, 0x38000000, 0x3A000000,
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0x3C000000, 0x3E000000, 0x40000000, 0x42000000, 0x44000000, 0x46000000, 0x48000000, 0x4A000000, 0x4C000000, 0x4E000000, 0x50000000, 0x52000000, 0x54000000, 0x56000000, 0x58000000, 0x5A000000,
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0x5C000000, 0x5E000000, 0x60000000, 0x62000000, 0x64000000, 0x66000000, 0x68000000, 0x6A000000, 0x6C000000, 0x6E000000, 0x70000000, 0x72000000, 0x74000000, 0x76000000, 0x78000000, 0x7A000000,
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0x7C000000, 0x7E000000, 0x80000000, 0x82000000, 0x84000000, 0x86000000, 0x88000000, 0x8A000000, 0x8C000000, 0x8E000000, 0x90000000, 0x92000000, 0x94000000, 0x96000000, 0x98000000, 0x9A000000,
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};
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uint CLZDecompBase::m_lzx_position_extra_mask[CLZDecompBase::cLZXMaxPositionSlots] =
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{
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0x0, 0x0, 0x0, 0x0, 0x1, 0x1, 0x3, 0x3, 0x7, 0x7, 0xF, 0xF, 0x1F, 0x1F, 0x3F, 0x3F,
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0x7F, 0x7F, 0xFF, 0xFF, 0x1FF, 0x1FF, 0x3FF, 0x3FF, 0x7FF, 0x7FF, 0xFFF, 0xFFF, 0x1FFF, 0x1FFF, 0x3FFF, 0x3FFF,
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0x7FFF, 0x7FFF, 0xFFFF, 0xFFFF, 0x1FFFF, 0x1FFFF, 0x3FFFF, 0x3FFFF, 0x7FFFF, 0x7FFFF, 0xFFFFF, 0xFFFFF, 0x1FFFFF, 0x1FFFFF, 0x3FFFFF, 0x3FFFFF,
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0x7FFFFF, 0x7FFFFF, 0xFFFFFF, 0xFFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF,
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0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF,
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0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF,
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0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF,
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0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF, 0x1FFFFFF
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};
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uint8 CLZDecompBase::m_lzx_position_extra_bits[CLZDecompBase::cLZXMaxPositionSlots] =
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{
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0x0, 0x0, 0x0, 0x0, 0x1, 0x1, 0x2, 0x2, 0x3, 0x3, 0x4, 0x4, 0x5, 0x5, 0x6, 0x6,
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0x7, 0x7, 0x8, 0x8, 0x9, 0x9, 0xA, 0xA, 0xB, 0xB, 0xC, 0xC, 0xD, 0xD, 0xE, 0xE,
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0xF, 0xF, 0x10, 0x10, 0x11, 0x11, 0x12, 0x12, 0x13, 0x13, 0x14, 0x14, 0x15, 0x15, 0x16, 0x16,
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0x17, 0x17, 0x18, 0x18, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19,
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0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19,
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0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19,
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0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19,
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0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19
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};
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static const uint8 g_num_lzx_position_slots[] = { 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 58, 66 };
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void CLZDecompBase::init_position_slots(uint dict_size_log2)
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{
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LZHAM_ASSERT(dict_size_log2 >= LZHAM_MIN_DICT_SIZE_LOG2);
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LZHAM_ASSERT(dict_size_log2 <= LZHAM_MAX_DICT_SIZE_LOG2_X64);
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LZHAM_ASSERT((sizeof(g_table_update_settings) / sizeof(g_table_update_settings[0])) == LZHAM_FASTEST_TABLE_UPDATE_RATE);
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//for (dict_size_log2 = LZHAM_MIN_DICT_SIZE_LOG2; dict_size_log2 <= LZHAM_MAX_DICT_SIZE_LOG2_X64; dict_size_log2++) {
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m_dict_size_log2 = dict_size_log2;
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m_dict_size = 1U << dict_size_log2;
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m_num_lzx_slots = g_num_lzx_position_slots[dict_size_log2 - LZHAM_MIN_DICT_SIZE_LOG2];
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#if 0
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int i, j;
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for (i = 0, j = 0; i < cLZXMaxPositionSlots; i += 2)
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{
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m_lzx_position_extra_bits[i] = (uint8)j;
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m_lzx_position_extra_bits[i + 1] = (uint8)j;
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if ((i != 0) && (j < 25))
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j++;
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}
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for (i = 0, j = 0; i < cLZXMaxPositionSlots; i++)
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{
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m_lzx_position_base[i] = j;
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m_lzx_position_extra_mask[i] = (1 << m_lzx_position_extra_bits[i]) - 1;
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j += (1 << m_lzx_position_extra_bits[i]);
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}
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for (uint i = 0; i < cLZXMaxPositionSlots; i++)
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{
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printf("0x%X, ", m_lzx_position_base[i]);
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if ((i & 15) == 15) printf("\n");
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}
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#endif
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#if 0
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m_num_lzx_slots = 0;
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const uint largest_dist = m_dict_size - 1;
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for (i = 0; i < cLZXMaxPositionSlots; i++)
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{
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if ( (largest_dist >= m_lzx_position_base[i]) &&
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(largest_dist < (m_lzx_position_base[i] + (1 << m_lzx_position_extra_bits[i])) ) )
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{
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m_num_lzx_slots = i + 1;
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break;
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}
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}
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LZHAM_VERIFY(m_num_lzx_slots);
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#endif
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//printf("%u, ", m_num_lzx_slots); }
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}
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} //namespace lzham
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