1 | /* lzo1f_d.ash -- assembler implementation of the LZO1F decompression algorithm |
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2 | |
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3 | This file is part of the LZO real-time data compression library. |
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4 | |
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5 | Copyright (C) 1996-2014 Markus Franz Xaver Johannes Oberhumer |
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6 | All Rights Reserved. |
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7 | |
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8 | The LZO library is free software; you can redistribute it and/or |
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9 | modify it under the terms of the GNU General Public License as |
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10 | published by the Free Software Foundation; either version 2 of |
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11 | the License, or (at your option) any later version. |
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12 | |
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13 | The LZO library is distributed in the hope that it will be useful, |
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14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | GNU General Public License for more details. |
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17 | |
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18 | You should have received a copy of the GNU General Public License |
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19 | along with the LZO library; see the file COPYING. |
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20 | If not, write to the Free Software Foundation, Inc., |
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21 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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22 | |
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23 | Markus F.X.J. Oberhumer |
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24 | <markus@oberhumer.com> |
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25 | http://www.oberhumer.com/opensource/lzo/ |
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26 | */ |
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27 | |
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28 | |
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29 | /*********************************************************************** |
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30 | // |
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31 | ************************************************************************/ |
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32 | |
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33 | ALIGN3 |
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34 | .L0: |
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35 | xorl %eax,%eax |
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36 | movb (%esi),%al |
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37 | incl %esi |
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38 | cmpb $31,%al |
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39 | ja .LM2 |
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40 | |
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41 | orb %al,%al |
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42 | movl %eax,%ecx |
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43 | jnz .L2 |
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44 | 1: |
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45 | LODSB |
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46 | orb %al,%al |
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47 | jnz 2f |
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48 | addl N_255,%ecx |
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49 | jmp 1b |
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50 | 2: |
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51 | lea 31(%eax,%ecx),%ecx |
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52 | .L2: |
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53 | TEST_OP((%edi,%ecx),%ebx) |
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54 | TEST_IP((%esi,%ecx),%ebx) |
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55 | movb %cl,%al |
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56 | shrl $2,%ecx |
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57 | rep |
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58 | movsl |
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59 | andb $3,%al |
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60 | jz 1f |
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61 | movl (%esi),%ebx |
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62 | addl %eax,%esi |
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63 | movl %ebx,(%edi) |
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64 | addl %eax,%edi |
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65 | 1: |
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66 | movb (%esi),%al |
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67 | incl %esi |
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68 | .LM1: |
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69 | cmpb $31,%al |
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70 | jbe .LM21 |
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71 | |
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72 | .LM2: |
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73 | cmpb $223,%al |
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74 | ja .LM3 |
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75 | |
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76 | movl %eax,%ecx |
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77 | shrl $2,%eax |
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78 | lea -1(%edi),%edx |
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79 | andb $7,%al |
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80 | shrl $5,%ecx |
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81 | movl %eax,%ebx |
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82 | |
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83 | movb (%esi),%al |
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84 | leal (%ebx,%eax,8),%eax |
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85 | incl %esi |
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86 | .LM5: |
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87 | subl %eax,%edx |
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88 | addl $2,%ecx |
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89 | xchgl %edx,%esi |
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90 | TEST_LOOKBEHIND(%esi) |
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91 | TEST_OP((%edi,%ecx),%ebx) |
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92 | cmpl $6,%ecx |
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93 | jb 1f |
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94 | cmpl $4,%eax |
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95 | jb 1f |
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96 | movb %cl,%al |
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97 | shrl $2,%ecx |
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98 | rep |
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99 | movsl |
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100 | andb $3,%al |
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101 | movb %al,%cl |
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102 | 1: |
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103 | rep |
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104 | movsb |
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105 | movl %edx,%esi |
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106 | .LN1: |
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107 | movb -2(%esi),%cl |
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108 | andl $3,%ecx |
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109 | jz .L0 |
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110 | movl (%esi),%eax |
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111 | addl %ecx,%esi |
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112 | movl %eax,(%edi) |
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113 | addl %ecx,%edi |
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114 | xorl %eax,%eax |
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115 | movb (%esi),%al |
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116 | incl %esi |
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117 | jmp .LM1 |
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118 | .LM21: |
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119 | TEST_OP(3(%edi),%edx) |
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120 | shrl $2,%eax |
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121 | leal -0x801(%edi),%edx |
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122 | movl %eax,%ecx |
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123 | movb (%esi),%al |
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124 | incl %esi |
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125 | leal (%ecx,%eax,8),%eax |
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126 | subl %eax,%edx |
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127 | TEST_LOOKBEHIND(%edx) |
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128 | movl (%edx),%eax |
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129 | movl %eax,(%edi) |
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130 | addl $3,%edi |
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131 | jmp .LN1 |
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132 | 1: |
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133 | LODSB |
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134 | orb %al,%al |
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135 | jnz 2f |
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136 | addl N_255,%ecx |
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137 | jmp 1b |
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138 | 2: |
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139 | lea 31(%eax,%ecx),%ecx |
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140 | jmp .LM4 |
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141 | |
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142 | ALIGN3 |
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143 | .LM3: |
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144 | andb $31,%al |
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145 | movl %eax,%ecx |
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146 | jz 1b |
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147 | .LM4: |
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148 | movl %edi,%edx |
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149 | movw (%esi),%ax |
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150 | addl $2,%esi |
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151 | shrl $2,%eax |
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152 | jnz .LM5 |
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153 | |
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154 | .LEOF: |
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155 | /**** xorl %eax,%eax eax=0 from above */ |
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156 | |
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157 | cmpl $1,%ecx /* ecx must be 1 */ |
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158 | setnz %al |
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159 | |
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160 | |
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161 | /* |
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162 | vi:ts=4 |
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163 | */ |
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164 | |
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