| 1 | /* |
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| 2 | * wave.c -- this file contains decompression methods used by Storm.dll |
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| 3 | * to decompress wave files. |
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| 4 | * |
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| 5 | * Copyright (C) 2003 Maik Broemme <mbroemme@plusserver.de> |
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| 6 | * |
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| 7 | * This source was adepted from the C++ version of wave.cpp included |
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| 8 | * in stormlib. The C++ version belongs to the following authors, |
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| 9 | * |
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| 10 | * Ladislav Zezula <ladik.zezula.net> |
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| 11 | * Tom Amigo <tomamigo@apexmail.com> |
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| 12 | * |
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| 13 | * This program is free software; you can redistribute it and/or modify |
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| 14 | * it under the terms of the GNU General Public License as published by |
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| 15 | * the Free Software Foundation; either version 2 of the License, or |
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| 16 | * (at your option) any later version. |
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| 17 | * |
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| 18 | * This program is distributed in the hope that it will be useful, |
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| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 21 | * GNU General Public License for more details. |
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| 22 | * |
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| 23 | * You should have received a copy of the GNU General Public License |
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| 24 | * along with this program; if not, write to the Free Software |
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| 25 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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| 26 | */ |
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| 27 | |
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| 28 | #include "wave.h" |
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| 29 | |
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| 30 | /* Tables necessary dor decompression */ |
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| 31 | static unsigned long wave_table_1503f120[] = { |
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| 32 | 0xFFFFFFFF, 0x00000000, 0xFFFFFFFF, 0x00000004, 0xFFFFFFFF, 0x00000002, 0xFFFFFFFF, 0x00000006, |
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| 33 | 0xFFFFFFFF, 0x00000001, 0xFFFFFFFF, 0x00000005, 0xFFFFFFFF, 0x00000003, 0xFFFFFFFF, 0x00000007, |
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| 34 | 0xFFFFFFFF, 0x00000001, 0xFFFFFFFF, 0x00000005, 0xFFFFFFFF, 0x00000003, 0xFFFFFFFF, 0x00000007, |
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| 35 | 0xFFFFFFFF, 0x00000002, 0xFFFFFFFF, 0x00000004, 0xFFFFFFFF, 0x00000006, 0xFFFFFFFF, 0x00000008 |
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| 36 | }; |
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| 37 | |
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| 38 | static unsigned long wave_table_1503f1a0[] = { |
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| 39 | 0x00000007, 0x00000008, 0x00000009, 0x0000000A, 0x0000000B, 0x0000000C, 0x0000000D, 0x0000000E, |
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| 40 | 0x00000010, 0x00000011, 0x00000013, 0x00000015, 0x00000017, 0x00000019, 0x0000001C, 0x0000001F, |
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| 41 | 0x00000022, 0x00000025, 0x00000029, 0x0000002D, 0x00000032, 0x00000037, 0x0000003C, 0x00000042, |
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| 42 | 0x00000049, 0x00000050, 0x00000058, 0x00000061, 0x0000006B, 0x00000076, 0x00000082, 0x0000008F, |
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| 43 | 0x0000009D, 0x000000AD, 0x000000BE, 0x000000D1, 0x000000E6, 0x000000FD, 0x00000117, 0x00000133, |
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| 44 | 0x00000151, 0x00000173, 0x00000198, 0x000001C1, 0x000001EE, 0x00000220, 0x00000256, 0x00000292, |
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| 45 | 0x000002D4, 0x0000031C, 0x0000036C, 0x000003C3, 0x00000424, 0x0000048E, 0x00000502, 0x00000583, |
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| 46 | 0x00000610, 0x000006AB, 0x00000756, 0x00000812, 0x000008E0, 0x000009C3, 0x00000ABD, 0x00000BD0, |
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| 47 | 0x00000CFF, 0x00000E4C, 0x00000FBA, 0x0000114C, 0x00001307, 0x000014EE, 0x00001706, 0x00001954, |
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| 48 | 0x00001BDC, 0x00001EA5, 0x000021B6, 0x00002515, 0x000028CA, 0x00002CDF, 0x0000315B, 0x0000364B, |
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| 49 | 0x00003BB9, 0x000041B2, 0x00004844, 0x00004F7E, 0x00005771, 0x0000602F, 0x000069CE, 0x00007462, |
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| 50 | 0x00007FFF |
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| 51 | }; |
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| 52 | |
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| 53 | /* |
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| 54 | * Decompress a wave file, mono or stereo |
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| 55 | * |
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| 56 | * Offset: 1500F230 |
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| 57 | */ |
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| 58 | int libmpq_wave_decompress(unsigned char *out_buf, int out_length, unsigned char *in_buf, int in_length, int channels) { |
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| 59 | byte_and_short out; |
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| 60 | byte_and_short in; |
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| 61 | unsigned char *in_end = in_buf + in_length; /* End on input buffer */ |
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| 62 | unsigned long index; |
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| 63 | long nr_array1[2]; |
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| 64 | long nr_array2[2]; |
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| 65 | int count = 0; |
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| 66 | |
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| 67 | out.pb = out_buf; |
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| 68 | in.pb = in_buf; |
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| 69 | nr_array1[0] = 0x2C; |
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| 70 | nr_array1[1] = 0x2C; |
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| 71 | in.pw++; |
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| 72 | |
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| 73 | /* 15007AD7 */ |
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| 74 | for (count = 0; count < channels; count++) { |
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| 75 | long temp; |
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| 76 | temp = *(short *)in.pw++; |
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| 77 | nr_array2[count] = temp; |
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| 78 | if (out_length < 2) { |
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| 79 | return out.pb - out_buf; |
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| 80 | } |
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| 81 | *out.pw++ = (unsigned short)temp; |
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| 82 | out_length -= 2; |
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| 83 | } |
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| 84 | index = channels - 1; |
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| 85 | while (in.pb < in_end) { |
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| 86 | unsigned char one_byte = *in.pb++; |
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| 87 | if (channels == 2) { |
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| 88 | index = (index == 0) ? 1 : 0; |
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| 89 | } |
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| 90 | |
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| 91 | /* |
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| 92 | * Get one byte from input buffer |
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| 93 | * 15007B25 |
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| 94 | */ |
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| 95 | if (one_byte & 0x80) { |
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| 96 | /* 15007B32 */ |
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| 97 | switch(one_byte & 0x7F) { |
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| 98 | case 0: /* 15007B8E */ |
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| 99 | if (nr_array1[index] != 0) { |
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| 100 | nr_array1[index]--; |
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| 101 | } |
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| 102 | if (out_length < 2) { |
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| 103 | break; |
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| 104 | } |
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| 105 | *out.pw++ = (unsigned short)nr_array2[index]; |
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| 106 | out_length -= 2; |
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| 107 | continue; |
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| 108 | case 1: /* 15007B72 */ |
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| 109 | nr_array1[index] += 8; /* EBX also */ |
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| 110 | if (nr_array1[index] > 0x58) { |
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| 111 | nr_array1[index] = 0x58; |
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| 112 | } |
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| 113 | if (channels == 2) { |
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| 114 | index = (index == 0) ? 1 : 0; |
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| 115 | } |
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| 116 | continue; |
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| 117 | case 2: |
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| 118 | continue; |
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| 119 | default: |
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| 120 | nr_array1[index] -= 8; |
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| 121 | if (nr_array1[index] < 0) { |
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| 122 | nr_array1[index] = 0; |
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| 123 | } |
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| 124 | if (channels != 2) { |
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| 125 | continue; |
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| 126 | } |
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| 127 | index = (index == 0) ? 1 : 0; |
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| 128 | continue; |
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| 129 | } |
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| 130 | } else { |
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| 131 | unsigned long temp1 = wave_table_1503f1a0[nr_array1[index]]; /* EDI */ |
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| 132 | unsigned long temp2 = temp1 >> in_buf[1]; /* ESI */ |
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| 133 | long temp3 = nr_array2[index]; /* ECX */ |
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| 134 | if (one_byte & 0x01) { /* EBX = one_byte */ |
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| 135 | temp2 += (temp1 >> 0); |
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| 136 | } |
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| 137 | if (one_byte & 0x02) { |
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| 138 | temp2 += (temp1 >> 1); |
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| 139 | } |
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| 140 | if (one_byte & 0x04) { |
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| 141 | temp2 += (temp1 >> 2); |
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| 142 | } |
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| 143 | if (one_byte & 0x08) { |
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| 144 | temp2 += (temp1 >> 3); |
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| 145 | } |
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| 146 | if (one_byte & 0x10) { |
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| 147 | temp2 += (temp1 >> 4); |
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| 148 | } |
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| 149 | if (one_byte & 0x20) { |
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| 150 | temp2 += (temp1 >> 5); |
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| 151 | } |
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| 152 | if(one_byte & 0x40) { |
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| 153 | temp3 -= temp2; |
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| 154 | if (temp3 <= (long)0xFFFF8000) { |
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| 155 | temp3 = (long)0xFFFF8000; |
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| 156 | } |
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| 157 | } else { |
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| 158 | temp3 += temp2; |
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| 159 | if (temp3 >= 0x7FFF) { |
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| 160 | temp3 = 0x7FFF; |
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| 161 | } |
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| 162 | } |
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| 163 | nr_array2[index] = temp3; |
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| 164 | if (out_length < 2) { |
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| 165 | break; |
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| 166 | } |
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| 167 | |
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| 168 | temp2 = nr_array1[index]; |
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| 169 | one_byte &= 0x1F; |
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| 170 | *out.pw++ = (unsigned short)temp3; |
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| 171 | out_length -= 2; |
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| 172 | temp2 += wave_table_1503f120[one_byte]; |
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| 173 | nr_array1[index] = temp2; |
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| 174 | |
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| 175 | if (nr_array1[index] < 0) { |
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| 176 | nr_array1[index] = 0; |
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| 177 | } else { |
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| 178 | if (nr_array1[index] > 0x58) { |
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| 179 | nr_array1[index] = 0x58; |
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| 180 | } |
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| 181 | } |
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| 182 | } |
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| 183 | } |
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| 184 | return (out.pb - out_buf); |
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| 185 | } |
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