SliTaz Repositories

     1.1 --- a/plop/stuff/unzx0.S	Sat Aug 26 15:51:29 2023 +0000
     1.2 +++ b/plop/stuff/unzx0.S	Sat Aug 17 17:30:48 2024 +0100
     1.3 @@ -40,11 +40,9 @@
     1.4  //  3. This notice may not be removed or altered from any source distribution.
     1.5  
     1.6  zx0_decompress:
     1.7 -        cld                     // make string operations go forward
     1.8          movb    $0x80, %al      // initialize empty bit queue
     1.9                                  // plus bit to roll into carry
    1.10 -        stc
    1.11 -        sbb     BX, BX          // initialize rep-offset to 1
    1.12 +        movw    $-1, BX         // initialize rep-offset to 1
    1.13  
    1.14  .literals:
    1.15  #if !defined(FLAT16) && !defined(FLAT32)
    1.16 @@ -68,9 +66,9 @@
    1.17  #if !defined(FLAT16OUT) && !defined(FLAT32)
    1.18          jmp     .copy_match
    1.19  .fix_di:
    1.20 -        subw    $256, %di
    1.21 +        subw    $256*64, %di
    1.22          movw    %es, %dx
    1.23 -        addw    $16, %dx
    1.24 +        addw    $16*64, %dx
    1.25          movw    %dx, %es
    1.26  .copy_match:
    1.27          cmpw    $-32640, %di    // assume 32639 max window
    1.28 @@ -99,11 +97,12 @@
    1.29          je      .done           // exit if EOD marker
    1.30          
    1.31          movb    %cl, %bh        // transfer negative high byte into bh
    1.32 +        xchgw   %ax, %bx
    1.33 +        lodsb                   // read low byte of offset + 1 bit of len
    1.34 +        xchgw   %ax, %bx
    1.35          movw    $1, %cx         // initialize match length value to 1
    1.36 -        movb    (%si), %bl      // read low byte of offset + 1 bit of len
    1.37 -        incw    %si             // inc instruction keep carry set
    1.38                                  // set high bit that is shifted into bit 15
    1.39 -        rcrw    $1, %bx         // shift len bit into carry/offset in place
    1.40 +        rcrw    %cl, %bx        // shift len bit into carry/offset in place
    1.41          call    .elias_bt       // if len bit is set, no need for more
    1.42                                  // else read rest of elias-encoded match length
    1.43          incw    %cx             // fix match length