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devilutionX/3rdParty/PKWare/explode.cpp

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/*****************************************************************************/
/* explode.cpp Copyright (c) Ladislav Zezula 2003 */
/*---------------------------------------------------------------------------*/
/* Implode function of PKWARE Data Compression library */
/*---------------------------------------------------------------------------*/
/* Date Ver Who Comment */
/* -------- ---- --- ------- */
/* 11.03.03 1.00 Lad Splitted from Pkware.cpp */
/* 08.04.03 1.01 Lad Renamed to explode.cpp to be compatible with pkware */
/* 02.05.03 1.01 Lad Stress test done */
/* 22.04.10 1.01 Lad Documented */
/*****************************************************************************/
#include <assert.h>
#include <string.h>
#include "pkware.h"
#define PKDCL_OK 0
#define PKDCL_STREAM_END 1 // All data from the input stream is read
#define PKDCL_NEED_DICT 2 // Need more data (dictionary)
#define PKDCL_CONTINUE 10 // Internal flag, not returned to user
#define PKDCL_GET_INPUT 11 // Internal flag, not returned to user
static char CopyrightPkware[] = "PKWARE Data Compression Library for Win32\r\n"
"Copyright 1989-1995 PKWARE Inc. All Rights Reserved\r\n"
"Patent No. 5,051,745\r\n"
"PKWARE Data Compression Library Reg. U.S. Pat. and Tm. Off.\r\n"
"Version 1.11\r\n";
//-----------------------------------------------------------------------------
// Tables
static unsigned char DistBits[] =
{
0x02, 0x04, 0x04, 0x05, 0x05, 0x05, 0x05, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08
};
static unsigned char DistCode[] =
{
0x03, 0x0D, 0x05, 0x19, 0x09, 0x11, 0x01, 0x3E, 0x1E, 0x2E, 0x0E, 0x36, 0x16, 0x26, 0x06, 0x3A,
0x1A, 0x2A, 0x0A, 0x32, 0x12, 0x22, 0x42, 0x02, 0x7C, 0x3C, 0x5C, 0x1C, 0x6C, 0x2C, 0x4C, 0x0C,
0x74, 0x34, 0x54, 0x14, 0x64, 0x24, 0x44, 0x04, 0x78, 0x38, 0x58, 0x18, 0x68, 0x28, 0x48, 0x08,
0xF0, 0x70, 0xB0, 0x30, 0xD0, 0x50, 0x90, 0x10, 0xE0, 0x60, 0xA0, 0x20, 0xC0, 0x40, 0x80, 0x00
};
static unsigned char ExLenBits[] =
{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08
};
static unsigned short LenBase[] =
{
0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
0x0008, 0x000A, 0x000E, 0x0016, 0x0026, 0x0046, 0x0086, 0x0106
};
static unsigned char LenBits[] =
{
0x03, 0x02, 0x03, 0x03, 0x04, 0x04, 0x04, 0x05, 0x05, 0x05, 0x05, 0x06, 0x06, 0x06, 0x07, 0x07
};
static unsigned char LenCode[] =
{
0x05, 0x03, 0x01, 0x06, 0x0A, 0x02, 0x0C, 0x14, 0x04, 0x18, 0x08, 0x30, 0x10, 0x20, 0x40, 0x00
};
static unsigned char ChBitsAsc[] =
{
0x0B, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x08, 0x07, 0x0C, 0x0C, 0x07, 0x0C, 0x0C,
0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0D, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C,
0x04, 0x0A, 0x08, 0x0C, 0x0A, 0x0C, 0x0A, 0x08, 0x07, 0x07, 0x08, 0x09, 0x07, 0x06, 0x07, 0x08,
0x07, 0x06, 0x07, 0x07, 0x07, 0x07, 0x08, 0x07, 0x07, 0x08, 0x08, 0x0C, 0x0B, 0x07, 0x09, 0x0B,
0x0C, 0x06, 0x07, 0x06, 0x06, 0x05, 0x07, 0x08, 0x08, 0x06, 0x0B, 0x09, 0x06, 0x07, 0x06, 0x06,
0x07, 0x0B, 0x06, 0x06, 0x06, 0x07, 0x09, 0x08, 0x09, 0x09, 0x0B, 0x08, 0x0B, 0x09, 0x0C, 0x08,
0x0C, 0x05, 0x06, 0x06, 0x06, 0x05, 0x06, 0x06, 0x06, 0x05, 0x0B, 0x07, 0x05, 0x06, 0x05, 0x05,
0x06, 0x0A, 0x05, 0x05, 0x05, 0x05, 0x08, 0x07, 0x08, 0x08, 0x0A, 0x0B, 0x0B, 0x0C, 0x0C, 0x0C,
0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D,
0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D,
0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D,
0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C,
0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C,
0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C, 0x0C,
0x0D, 0x0C, 0x0D, 0x0D, 0x0D, 0x0C, 0x0D, 0x0D, 0x0D, 0x0C, 0x0D, 0x0D, 0x0D, 0x0D, 0x0C, 0x0D,
0x0D, 0x0D, 0x0C, 0x0C, 0x0C, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D, 0x0D
};
static unsigned short ChCodeAsc[] =
{
0x0490, 0x0FE0, 0x07E0, 0x0BE0, 0x03E0, 0x0DE0, 0x05E0, 0x09E0,
0x01E0, 0x00B8, 0x0062, 0x0EE0, 0x06E0, 0x0022, 0x0AE0, 0x02E0,
0x0CE0, 0x04E0, 0x08E0, 0x00E0, 0x0F60, 0x0760, 0x0B60, 0x0360,
0x0D60, 0x0560, 0x1240, 0x0960, 0x0160, 0x0E60, 0x0660, 0x0A60,
0x000F, 0x0250, 0x0038, 0x0260, 0x0050, 0x0C60, 0x0390, 0x00D8,
0x0042, 0x0002, 0x0058, 0x01B0, 0x007C, 0x0029, 0x003C, 0x0098,
0x005C, 0x0009, 0x001C, 0x006C, 0x002C, 0x004C, 0x0018, 0x000C,
0x0074, 0x00E8, 0x0068, 0x0460, 0x0090, 0x0034, 0x00B0, 0x0710,
0x0860, 0x0031, 0x0054, 0x0011, 0x0021, 0x0017, 0x0014, 0x00A8,
0x0028, 0x0001, 0x0310, 0x0130, 0x003E, 0x0064, 0x001E, 0x002E,
0x0024, 0x0510, 0x000E, 0x0036, 0x0016, 0x0044, 0x0030, 0x00C8,
0x01D0, 0x00D0, 0x0110, 0x0048, 0x0610, 0x0150, 0x0060, 0x0088,
0x0FA0, 0x0007, 0x0026, 0x0006, 0x003A, 0x001B, 0x001A, 0x002A,
0x000A, 0x000B, 0x0210, 0x0004, 0x0013, 0x0032, 0x0003, 0x001D,
0x0012, 0x0190, 0x000D, 0x0015, 0x0005, 0x0019, 0x0008, 0x0078,
0x00F0, 0x0070, 0x0290, 0x0410, 0x0010, 0x07A0, 0x0BA0, 0x03A0,
0x0240, 0x1C40, 0x0C40, 0x1440, 0x0440, 0x1840, 0x0840, 0x1040,
0x0040, 0x1F80, 0x0F80, 0x1780, 0x0780, 0x1B80, 0x0B80, 0x1380,
0x0380, 0x1D80, 0x0D80, 0x1580, 0x0580, 0x1980, 0x0980, 0x1180,
0x0180, 0x1E80, 0x0E80, 0x1680, 0x0680, 0x1A80, 0x0A80, 0x1280,
0x0280, 0x1C80, 0x0C80, 0x1480, 0x0480, 0x1880, 0x0880, 0x1080,
0x0080, 0x1F00, 0x0F00, 0x1700, 0x0700, 0x1B00, 0x0B00, 0x1300,
0x0DA0, 0x05A0, 0x09A0, 0x01A0, 0x0EA0, 0x06A0, 0x0AA0, 0x02A0,
0x0CA0, 0x04A0, 0x08A0, 0x00A0, 0x0F20, 0x0720, 0x0B20, 0x0320,
0x0D20, 0x0520, 0x0920, 0x0120, 0x0E20, 0x0620, 0x0A20, 0x0220,
0x0C20, 0x0420, 0x0820, 0x0020, 0x0FC0, 0x07C0, 0x0BC0, 0x03C0,
0x0DC0, 0x05C0, 0x09C0, 0x01C0, 0x0EC0, 0x06C0, 0x0AC0, 0x02C0,
0x0CC0, 0x04C0, 0x08C0, 0x00C0, 0x0F40, 0x0740, 0x0B40, 0x0340,
0x0300, 0x0D40, 0x1D00, 0x0D00, 0x1500, 0x0540, 0x0500, 0x1900,
0x0900, 0x0940, 0x1100, 0x0100, 0x1E00, 0x0E00, 0x0140, 0x1600,
0x0600, 0x1A00, 0x0E40, 0x0640, 0x0A40, 0x0A00, 0x1200, 0x0200,
0x1C00, 0x0C00, 0x1400, 0x0400, 0x1800, 0x0800, 0x1000, 0x0000
};
//-----------------------------------------------------------------------------
// Local functions
static void PKWAREAPI GenDecodeTabs(
unsigned char * positions, // [out] Table of positions
unsigned char * start_indexes, // [in] Table of start indexes
unsigned char * length_bits, // [in] Table of lengths. Each length is stored as number of bits
size_t elements) // [in] Number of elements in start_indexes and length_bits
{
unsigned int index;
unsigned int length;
size_t i;
for(i = 0; i < elements; i++)
{
length = 1 << length_bits[i]; // Get the length in bytes
for(index = start_indexes[i]; index < 0x100; index += length)
{
positions[index] = (unsigned char)i;
}
}
}
static void PKWAREAPI GenAscTabs(TDcmpStruct * pWork)
{
unsigned short * pChCodeAsc = &ChCodeAsc[0xFF];
unsigned int acc, add;
unsigned short count;
for(count = 0x00FF; pChCodeAsc >= ChCodeAsc; pChCodeAsc--, count--)
{
unsigned char * pChBitsAsc = pWork->ChBitsAsc + count;
unsigned char bits_asc = *pChBitsAsc;
if(bits_asc <= 8)
{
add = (1 << bits_asc);
acc = *pChCodeAsc;
do
{
pWork->offs2C34[acc] = (unsigned char)count;
acc += add;
}
while(acc < 0x100);
}
else if((acc = (*pChCodeAsc & 0xFF)) != 0)
{
pWork->offs2C34[acc] = 0xFF;
if(*pChCodeAsc & 0x3F)
{
bits_asc -= 4;
*pChBitsAsc = bits_asc;
add = (1 << bits_asc);
acc = *pChCodeAsc >> 4;
do
{
pWork->offs2D34[acc] = (unsigned char)count;
acc += add;
}
while(acc < 0x100);
}
else
{
bits_asc -= 6;
*pChBitsAsc = bits_asc;
add = (1 << bits_asc);
acc = *pChCodeAsc >> 6;
do
{
pWork->offs2E34[acc] = (unsigned char)count;
acc += add;
}
while(acc < 0x80);
}
}
else
{
bits_asc -= 8;
*pChBitsAsc = bits_asc;
add = (1 << bits_asc);
acc = *pChCodeAsc >> 8;
do
{
pWork->offs2EB4[acc] = (unsigned char)count;
acc += add;
}
while(acc < 0x100);
}
}
}
//-----------------------------------------------------------------------------
// Removes given number of bits in the bit buffer. New bits are reloaded from
// the input buffer, if needed.
// Returns: PKDCL_OK: Operation was successful
// PKDCL_STREAM_END: There are no more bits in the input buffer
static int PKWAREAPI WasteBits(TDcmpStruct * pWork, unsigned int nBits)
{
// If number of bits required is less than number of (bits in the buffer) ?
if(nBits <= pWork->extra_bits)
{
pWork->extra_bits -= nBits;
pWork->bit_buff >>= nBits;
return PKDCL_OK;
}
// Load input buffer if necessary
pWork->bit_buff >>= pWork->extra_bits;
if(pWork->in_pos == pWork->in_bytes)
{
pWork->in_pos = sizeof(pWork->in_buff);
if((pWork->in_bytes = pWork->read_buf((char *)pWork->in_buff, &pWork->in_pos, pWork->param)) == 0)
return PKDCL_STREAM_END;
pWork->in_pos = 0;
}
// Update bit buffer
pWork->bit_buff |= (pWork->in_buff[pWork->in_pos++] << 8);
pWork->bit_buff >>= (nBits - pWork->extra_bits);
pWork->extra_bits = (pWork->extra_bits - nBits) + 8;
return PKDCL_OK;
}
//-----------------------------------------------------------------------------
// Decodes next literal from the input (compressed) data.
// Returns : 0x000: One byte 0x00
// 0x001: One byte 0x01
// ...
// 0x0FF: One byte 0xFF
// 0x100: Repetition, length of 0x02 bytes
// 0x101: Repetition, length of 0x03 bytes
// ...
// 0x304: Repetition, length of 0x206 bytes
// 0x305: End of stream
// 0x306: Error
static unsigned int PKWAREAPI DecodeLit(TDcmpStruct * pWork)
{
unsigned int extra_length_bits; // Number of bits of extra literal length
unsigned int length_code; // Length code
unsigned int value;
// Test the current bit in byte buffer. If is not set, simply return the next 8 bits.
if(pWork->bit_buff & 1)
{
// Remove one bit from the input data
if(WasteBits(pWork, 1))
return 0x306;
// The next 8 bits hold the index to the length code table
length_code = pWork->LengthCodes[pWork->bit_buff & 0xFF];
// Remove the apropriate number of bits
if(WasteBits(pWork, pWork->LenBits[length_code]))
return 0x306;
// Are there some extra bits for the obtained length code ?
if((extra_length_bits = pWork->ExLenBits[length_code]) != 0)
{
unsigned int extra_length = pWork->bit_buff & ((1 << extra_length_bits) - 1);
if(WasteBits(pWork, extra_length_bits))
{
if((length_code + extra_length) != 0x10E)
return 0x306;
}
length_code = pWork->LenBase[length_code] + extra_length;
}
// In order to distinguish uncompressed byte from repetition length,
// we have to add 0x100 to the length.
return length_code + 0x100;
}
// Remove one bit from the input data
if(WasteBits(pWork, 1))
return 0x306;
// If the binary compression type, read 8 bits and return them as one byte.
if(pWork->ctype == CMP_BINARY)
{
unsigned int uncompressed_byte = pWork->bit_buff & 0xFF;
if(WasteBits(pWork, 8))
return 0x306;
return uncompressed_byte;
}
// When ASCII compression ...
if(pWork->bit_buff & 0xFF)
{
value = pWork->offs2C34[pWork->bit_buff & 0xFF];
if(value == 0xFF)
{
if(pWork->bit_buff & 0x3F)
{
if(WasteBits(pWork, 4))
return 0x306;
value = pWork->offs2D34[pWork->bit_buff & 0xFF];
}
else
{
if(WasteBits(pWork, 6))
return 0x306;
value = pWork->offs2E34[pWork->bit_buff & 0x7F];
}
}
}
else
{
if(WasteBits(pWork, 8))
return 0x306;
value = pWork->offs2EB4[pWork->bit_buff & 0xFF];
}
return WasteBits(pWork, pWork->ChBitsAsc[value]) ? 0x306 : value;
}
//-----------------------------------------------------------------------------
// Decodes the distance of the repetition, backwards relative to the
// current output buffer position
static unsigned int PKWAREAPI DecodeDist(TDcmpStruct * pWork, unsigned int rep_length)
{
unsigned int dist_pos_code; // Distance position code
unsigned int dist_pos_bits; // Number of bits of distance position
unsigned int distance; // Distance position
// Next 2-8 bits in the input buffer is the distance position code
dist_pos_code = pWork->DistPosCodes[pWork->bit_buff & 0xFF];
dist_pos_bits = pWork->DistBits[dist_pos_code];
if(WasteBits(pWork, dist_pos_bits))
return 0;
if(rep_length == 2)
{
// If the repetition is only 2 bytes length,
// then take 2 bits from the stream in order to get the distance
distance = (dist_pos_code << 2) | (pWork->bit_buff & 0x03);
if(WasteBits(pWork, 2))
return 0;
}
else
{
// If the repetition is more than 2 bytes length,
// then take "dsize_bits" bits in order to get the distance
distance = (dist_pos_code << pWork->dsize_bits) | (pWork->bit_buff & pWork->dsize_mask);
if(WasteBits(pWork, pWork->dsize_bits))
return 0;
}
return distance + 1;
}
static unsigned int PKWAREAPI Expand(TDcmpStruct * pWork)
{
unsigned int next_literal; // Literal decoded from the compressed data
unsigned int result; // Value to be returned
unsigned int copyBytes; // Number of bytes to copy to the output buffer
pWork->outputPos = 0x1000; // Initialize output buffer position
// Decode the next literal from the input data.
// The returned literal can either be an uncompressed byte (next_literal < 0x100)
// or an encoded length of the repeating byte sequence that
// is to be copied to the current buffer position
while((result = next_literal = DecodeLit(pWork)) < 0x305)
{
// If the literal is greater than 0x100, it holds length
// of repeating byte sequence
// literal of 0x100 means repeating sequence of 0x2 bytes
// literal of 0x101 means repeating sequence of 0x3 bytes
// ...
// literal of 0x305 means repeating sequence of 0x207 bytes
if(next_literal >= 0x100)
{
unsigned char * source;
unsigned char * target;
unsigned int rep_length; // Length of the repetition, in bytes
unsigned int minus_dist; // Backward distance to the repetition, relative to the current buffer position
// Get the length of the repeating sequence.
// Note that the repeating block may overlap the current output position,
// for example if there was a sequence of equal bytes
rep_length = next_literal - 0xFE;
// Get backward distance to the repetition
if((minus_dist = DecodeDist(pWork, rep_length)) == 0)
{
result = 0x306;
break;
}
// Target and source pointer
target = &pWork->out_buff[pWork->outputPos];
source = target - minus_dist;
// Update buffer output position
pWork->outputPos += rep_length;
// Copy the repeating sequence
while(rep_length-- > 0)
*target++ = *source++;
}
else
{
pWork->out_buff[pWork->outputPos++] = (unsigned char)next_literal;
}
// Flush the output buffer, if number of extracted bytes has reached the end
if(pWork->outputPos >= 0x2000)
{
// Copy decompressed data into user buffer
copyBytes = 0x1000;
pWork->write_buf((char *)&pWork->out_buff[0x1000], &copyBytes, pWork->param);
// Now copy the decompressed data to the first half of the buffer.
// This is needed because the decompression might reuse them as repetitions.
// Note that if the output buffer overflowed previously, the extra decompressed bytes
// are stored in "out_buff_overflow", and they will now be
// within decompressed part of the output buffer.
memmove(pWork->out_buff, &pWork->out_buff[0x1000], pWork->outputPos - 0x1000);
pWork->outputPos -= 0x1000;
}
}
// Flush any remaining decompressed bytes
copyBytes = pWork->outputPos - 0x1000;
pWork->write_buf((char *)&pWork->out_buff[0x1000], &copyBytes, pWork->param);
return result;
}
//-----------------------------------------------------------------------------
// Main exploding function.
unsigned int PKWAREAPI explode(
unsigned int (PKWAREAPI *read_buf)(char *buf, unsigned int *size, void *param),
void (PKWAREAPI *write_buf)(char *buf, unsigned int *size, void *param),
char *work_buf,
void *param)
{
TDcmpStruct * pWork = (TDcmpStruct *)work_buf;
// Initialize work struct and load compressed data
// Note: The caller must zero the "work_buff" before passing it to explode
pWork->read_buf = read_buf;
pWork->write_buf = write_buf;
pWork->param = param;
pWork->in_pos = sizeof(pWork->in_buff);
pWork->in_bytes = pWork->read_buf((char *)pWork->in_buff, &pWork->in_pos, pWork->param);
if(pWork->in_bytes <= 4)
return CMP_BAD_DATA;
pWork->ctype = pWork->in_buff[0]; // Get the compression type (CMP_BINARY or CMP_ASCII)
pWork->dsize_bits = pWork->in_buff[1]; // Get the dictionary size
pWork->bit_buff = pWork->in_buff[2]; // Initialize 16-bit bit buffer
pWork->extra_bits = 0; // Extra (over 8) bits
pWork->in_pos = 3; // Position in input buffer
// Test for the valid dictionary size
if(4 > pWork->dsize_bits || pWork->dsize_bits > 6)
return CMP_INVALID_DICTSIZE;
pWork->dsize_mask = 0xFFFF >> (0x10 - pWork->dsize_bits); // Shifted by 'sar' instruction
if(pWork->ctype != CMP_BINARY)
{
if(pWork->ctype != CMP_ASCII)
return CMP_INVALID_MODE;
memcpy(pWork->ChBitsAsc, ChBitsAsc, sizeof(pWork->ChBitsAsc));
GenAscTabs(pWork);
}
memcpy(pWork->LenBits, LenBits, sizeof(pWork->LenBits));
GenDecodeTabs(pWork->LengthCodes, LenCode, pWork->LenBits, sizeof(pWork->LenBits));
memcpy(pWork->ExLenBits, ExLenBits, sizeof(pWork->ExLenBits));
memcpy(pWork->LenBase, LenBase, sizeof(pWork->LenBase));
memcpy(pWork->DistBits, DistBits, sizeof(pWork->DistBits));
GenDecodeTabs(pWork->DistPosCodes, DistCode, pWork->DistBits, sizeof(pWork->DistBits));
if(Expand(pWork) != 0x306)
return CMP_NO_ERROR;
return CMP_ABORT;
}