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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