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pascal@25487
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1 // Lzsa1Decode:
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2 #ifndef FLAT32
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3 // input ds:si=inStream, es:di=outStream
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4 // output outStream[], ds:si, es:di
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5 .code16
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6 #define AX %ax
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7 #define BX %bx
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8 #define SI %si
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9 #define DI %di
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10 #else
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11 // input esi=inStream, edi=outStream
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12 // output outStream[], ds:esi, es:edi
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13 .code32
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14 #define AX %eax
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15 #define BX %ebx
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16 #define SI %esi
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17 #define DI %edi
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18 #endif
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19
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20 MATCH_RUN_LEN = 15
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21 LITERALS_RUN_LEN = 7
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22 MIN_MATCH_SIZE = 3
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23 MIN_LITERALS_SIZE = 0
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24
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25 #define PACKED_ONLY // assume no copy block, optional
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26 //#define PARANOIA // cover rare cases, optional
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27
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28 lzsa1main:
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29 #ifdef PARANOIA
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30 cld
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31 #endif
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32 #ifndef RAW_FORMAT
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33 # if defined(PARANOIA) && !defined(FLAT32) && !defined(FLAT16)
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34 xorw %cx, %cx
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35 call normalize
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36 # endif
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37 # ifndef NO_LZSA1_HEADER
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38 lodsw
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39 cmpw $0x9E7B, %ax // magic
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40 jne lzsa1main
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41 lodsb
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42 cmpb $0, %al // lzsa1
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43 jne lzsa1main
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44 # endif
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45 lzsa1block: // uncompress chunk
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46 lodsw // block size
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47 xchgw %ax, %cx
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48 lodsb
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49 # ifndef PACKED_ONLY
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50 orb %al, %al
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51 jns lzsa1compressed
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52 # if !defined(FLAT32) && !defined(FLAT16OUT)
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53 movw %cx, %dx
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54 movb $0, %cl
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55 movb $0, %dh
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56 copytail:
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57 call lzsa1movStr
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58 xchg %dx, %cx
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59 incw %cx
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60 loop copytail
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61 # else
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62 movsb // copy block
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63 copylp:
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64 movsb // copy block
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65 loop copylp // handle 64K case
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66 # endif
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67 jmp lzsa1block
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68 lzsa1compressed:
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69 jne lzsa1chunk // 64Kb block
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70 # endif
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71 jcxz lzsa1quit // bail if we hit EOD
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72 movw %cx, %dx
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73 # if !defined(FLAT32) && !defined(FLAT16)
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74 xorw %cx, %cx
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75 call normalize
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76 # define NeedNormalize
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77 # endif
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78 addw %si, %dx
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79 #endif
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80 lzsa1chunk: // uncompress chunk
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81 lodsb // get token O|LLL|MMMM
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82 movb %al, %bl // keep token in bl
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83 shrb $4, %al // shift literals length into place
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84 movw $LITERALS_RUN_LEN*256+MIN_LITERALS_SIZE, %cx
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85 call lzsa1len // %ch = LITERALS_RUN_LEN
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86 #if defined(NeedNormalize) && defined(PARANOIA)
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87 call lzsa1movLit // copy %cx literals from %ds:%si to %es:%di
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88 #else
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89 rep movsb // copy %cx literals from %ds:%si to %es:%di
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90 #endif
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91 #ifndef RAW_FORMAT
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92 cmpw %dx, %si
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93 jae lzsa1block // bail if we hit EOD
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94 #endif
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95 #ifdef FLAT32
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96 orl $-1, %eax
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97 #else
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98 movb $-1, %ah
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99 #endif
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100 testb %bl, %bl // check match offset size in token (O bit)
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101 jns lzsa1ShortOfs
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102 lodsw
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103 .byte 0x3C // mask lodsb with cmpb $0xAC, %al
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104 lzsa1ShortOfs:
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105 lodsb
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106 #ifdef RAW_FORMAT
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107 orw %ax, %ax
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108 jz lzsa1quit // bail if we hit EOD
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109 #endif
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110 xchg AX, BX // %bx: match offset %ax: original token
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111 movw $MATCH_RUN_LEN*256+MIN_MATCH_SIZE, %cx
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112 call lzsa1len
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113 #if !defined(FLAT32) && !defined(FLAT16OUT)
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114 pushw %ds
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115 pushw %si
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116 movw %di, %si
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117 addw %bx, %si
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118 movw %es, %ax
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119 jc axok
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120 subb $0x10, %ah
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121 axok:
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122 .macro norm reg
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123 movw %si, \reg
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124 andw $0xF, %si
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125 shrw $4, \reg
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126 addw \reg, %ax
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127 movw %ax, %ds
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128 lzsa1movLit:
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129 movw %di, \reg
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130 andw $0xF, %di
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131 shrw $4, \reg
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132 movw %es, %ax
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133 addw \reg, %ax
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134 movw %ax, %es
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135 .endm
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136 # if defined(NeedNormalize) || defined(PARANOIA)
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137 call lzsa1movStr // copy string
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138 # else
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139 norm %bp
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140 rep movsb
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141 # endif
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142 popw %si
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143 popw %ds
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144 #else
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145 xchg AX, SI // save %si
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146 lea (BX,DI), SI
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147 rep movsb %es:(SI), %es:(DI)
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148 xchg AX, SI // restore %si
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149 #endif
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150 jmp lzsa1chunk
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151
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152 lzsa1len: // get length in %ecx
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153 andb %ch, %al
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154 cbw // clear %ah
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155 cmpb %ch, %al
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156 jne lzsa1minNumber // S=0-6, L=0-14
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157 lodsb
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158 addb %ch, %cl
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159 lzsa1minNumber:
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160 addb %cl, %al
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161 jnc lzsa1gotNumber // 0-255
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162 movb %al, %ah // S=256-1791, L=256-3839 or S=256-511, L=256-511
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163 jne lzsa1midNumber
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164 lodsw // 0-65535
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165 .byte 0x3C // mask lodsb with cmpb $0xAC, %al
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166 lzsa1midNumber:
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167 lodsb
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168 lzsa1gotNumber:
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169 xchgw %ax, %cx
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170 lzsa1quit:
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171 ret
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172
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173 #if defined(NeedNormalize) || defined(PARANOIA)
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174 # if defined(PARANOIA)
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175 lzsa1movlp:
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176 decw %ch
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177 rep movsb
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178 incw %ch
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179 # endif
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180 normalize:
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181 movw %ds, %bp
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182 lzsa1movStr:
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183 norm %bp
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184 # if defined(PARANOIA)
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185 cmpb $0xFF, %ch // catch FFFX case
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186 je lzsa1movlp
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187 # endif
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188 rep movsb
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189 ret
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190 #endif
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