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/*
* wave.c -- this file contains decompression methods used by mpq-tools
* to decompress wave files.
*
* Copyright (c) 2003-2007 Maik Broemme <mbroemme@plusserver.de>
*
* This source was adepted from the C++ version of wave.cpp included
* in stormlib. The C++ version belongs to the following authors:
*
* Ladislav Zezula <ladik@zezula.net>
* Tom Amigo <tomamigo@apexmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* generic includes. */
#include <stdint.h>
/* libmpq generic includes. */
#include "wave.h"
/* table necessary dor decompression. */
static const uint32_t wave_table_1503f120[] = {
0xFFFFFFFF, 0x00000000, 0xFFFFFFFF, 0x00000004, 0xFFFFFFFF, 0x00000002, 0xFFFFFFFF, 0x00000006,
0xFFFFFFFF, 0x00000001, 0xFFFFFFFF, 0x00000005, 0xFFFFFFFF, 0x00000003, 0xFFFFFFFF, 0x00000007,
0xFFFFFFFF, 0x00000001, 0xFFFFFFFF, 0x00000005, 0xFFFFFFFF, 0x00000003, 0xFFFFFFFF, 0x00000007,
0xFFFFFFFF, 0x00000002, 0xFFFFFFFF, 0x00000004, 0xFFFFFFFF, 0x00000006, 0xFFFFFFFF, 0x00000008
};
/* table necessary dor decompression. */
static const uint32_t wave_table_1503f1a0[] = {
0x00000007, 0x00000008, 0x00000009, 0x0000000A, 0x0000000B, 0x0000000C, 0x0000000D, 0x0000000E,
0x00000010, 0x00000011, 0x00000013, 0x00000015, 0x00000017, 0x00000019, 0x0000001C, 0x0000001F,
0x00000022, 0x00000025, 0x00000029, 0x0000002D, 0x00000032, 0x00000037, 0x0000003C, 0x00000042,
0x00000049, 0x00000050, 0x00000058, 0x00000061, 0x0000006B, 0x00000076, 0x00000082, 0x0000008F,
0x0000009D, 0x000000AD, 0x000000BE, 0x000000D1, 0x000000E6, 0x000000FD, 0x00000117, 0x00000133,
0x00000151, 0x00000173, 0x00000198, 0x000001C1, 0x000001EE, 0x00000220, 0x00000256, 0x00000292,
0x000002D4, 0x0000031C, 0x0000036C, 0x000003C3, 0x00000424, 0x0000048E, 0x00000502, 0x00000583,
0x00000610, 0x000006AB, 0x00000756, 0x00000812, 0x000008E0, 0x000009C3, 0x00000ABD, 0x00000BD0,
0x00000CFF, 0x00000E4C, 0x00000FBA, 0x0000114C, 0x00001307, 0x000014EE, 0x00001706, 0x00001954,
0x00001BDC, 0x00001EA5, 0x000021B6, 0x00002515, 0x000028CA, 0x00002CDF, 0x0000315B, 0x0000364B,
0x00003BB9, 0x000041B2, 0x00004844, 0x00004F7E, 0x00005771, 0x0000602F, 0x000069CE, 0x00007462,
0x00007FFF
};
/* this function decompress a wave file, mono or stereo, 1500F230 offset. */
int32_t libmpq__do_decompress_wave(uint8_t *out_buf, int32_t out_length, uint8_t *in_buf, int32_t in_length, int32_t channels) {
/* some common variables. */
byte_and_int16_t out;
byte_and_int16_t in;
uint32_t index;
int32_t nr_array1[2];
int32_t nr_array2[2];
uint32_t count = 0;
/* end on input buffer. */
uint8_t *in_end = in_buf + in_length;
/* assign default values. */
out.pb = out_buf;
in.pb = in_buf;
nr_array1[0] = 0x2C;
nr_array1[1] = 0x2C;
/* increase. */
in.pw++;
/* 15007AD7 */
for (count = 0; count < channels; count++) {
/* some common variables. */
int32_t temp;
/* save pointer. */
temp = *(int16_t *)in.pw++;
nr_array2[count] = temp;
/* check if should break. */
if (out_length < 2) {
return out.pb - out_buf;
}
/* return values. */
*out.pw++ = (uint16_t)temp;
out_length -= 2;
}
/* decrease channels. */
index = channels - 1;
/* loop through input buffer until end reached. */
while (in.pb < in_end) {
/* save the byte. */
uint8_t one_byte = *in.pb++;
/* check how many channels and set index. */
if (channels == 2) {
index = (index == 0) ? 1 : 0;
}
/* 15007B25 - get one byte from input buffer. */
if (one_byte & 0x80) {
/* 15007B32 */
switch (one_byte & 0x7F) {
case 0:
/* 15007B8E */
if (nr_array1[index] != 0) {
nr_array1[index]--;
}
/* check if should break. */
if (out_length < 2) {
break;
}
/* return values. */
*out.pw++ = (uint16_t)nr_array2[index];
out_length -= 2;
/* continue loop. */
continue;
case 1:
/* 15007B72 and EBX. */
nr_array1[index] += 8;
/* check index. */
if (nr_array1[index] > 0x58) {
nr_array1[index] = 0x58;
}
/* check how many channels and set index. */
if (channels == 2) {
index = (index == 0) ? 1 : 0;
}
/* continue loop. */
continue;
case 2:
/* nothing todo, so continue. */
continue;
default:
/* decrease index. */
nr_array1[index] -= 8;
/* check index. */
if (nr_array1[index] < 0) {
nr_array1[index] = 0;
}
/* check if two channels left. */
if (channels != 2) {
continue;
}
index = (index == 0) ? 1 : 0;
/* continue loop. */
continue;
}
} else {
/* EDI */
uint32_t temp1 = wave_table_1503f1a0[nr_array1[index]];
/* ESI */
uint32_t temp2 = temp1 >> in_buf[1];
/* ECX */
int32_t temp3 = nr_array2[index];
/* EBX = one byte. */
if (one_byte & 0x01) {
temp2 += (temp1 >> 0);
}
if (one_byte & 0x02) {
temp2 += (temp1 >> 1);
}
if (one_byte & 0x04) {
temp2 += (temp1 >> 2);
}
if (one_byte & 0x08) {
temp2 += (temp1 >> 3);
}
if (one_byte & 0x10) {
temp2 += (temp1 >> 4);
}
if (one_byte & 0x20) {
temp2 += (temp1 >> 5);
}
if (one_byte & 0x40) {
temp3 -= temp2;
if (temp3 <= (int32_t)0xFFFF8000) {
temp3 = (int32_t)0xFFFF8000;
}
} else {
temp3 += temp2;
if (temp3 >= 0x7FFF) {
temp3 = 0x7FFF;
}
}
/* restore index. */
nr_array2[index] = temp3;
/* check if should break. */
if (out_length < 2) {
break;
}
/* assign values. */
temp2 = nr_array1[index];
one_byte &= 0x1F;
*out.pw++ = (uint16_t)temp3;
out_length -= 2;
temp2 += wave_table_1503f120[one_byte];
nr_array1[index] = temp2;
/* check index. */
if (nr_array1[index] < 0) {
nr_array1[index] = 0;
} else {
/* check index. */
if (nr_array1[index] > 0x58) {
nr_array1[index] = 0x58;
}
}
}
}
/* return copied bytes. */
return (out.pb - out_buf);
}
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