2018-06-05 14:34:03 -04:00
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;*
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;* x86_64-bios/tinf.inc
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;*
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2021-01-15 15:07:25 -05:00
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;* Copyright (C) 2017 - 2021 bzt (bztsrc@gitlab)
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2018-06-05 14:34:03 -04:00
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;*
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;* Permission is hereby granted, free of charge, to any person
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;* obtaining a copy of this software and associated documentation
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;* files (the "Software"), to deal in the Software without
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;* restriction, including without limitation the rights to use, copy,
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;* modify, merge, publish, distribute, sublicense, and/or sell copies
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;* of the Software, and to permit persons to whom the Software is
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;* furnished to do so, subject to the following conditions:
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;*
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;* The above copyright notice and this permission notice shall be
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;* included in all copies or substantial portions of the Software.
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;*
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;* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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;* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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;* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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;* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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;* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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;* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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;* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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;* DEALINGS IN THE SOFTWARE.
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;*
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;* This file is part of the BOOTBOOT Protocol package.
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;* @brief Tiny inflate, ported after tinflate.c by bzt
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;*
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;IN:
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2019-12-13 12:01:16 -05:00
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; esi: gzipped initrd (without gzip header)
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2018-06-05 14:34:03 -04:00
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; edi: output buffer (guaranteed to be big enough)
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; ecx: output buffer size
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tinf_uncompress:
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push ecx
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push edi
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mov edi, tinf_bss_start
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2019-12-13 12:01:16 -05:00
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mov ecx, tinf_bss_end-tinf_bss_start+1
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2018-06-05 14:34:03 -04:00
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xor al, al
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repnz stosb
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pop edi
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pop ecx
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mov dword [d_end], ecx
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add dword [d_end], edi
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.again:
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; start a new block
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cmp byte [d_btype], 255
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jne .notst
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; read final block flag
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.next_blk: call tinf_getbit
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mov byte [d_bfinal], al
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; read block type
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xor ebx, ebx
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mov cl, 2
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call tinf_read_bits
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mov byte [d_btype], al
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; build fixed huffman trees
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cmp al, 1
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jne @f
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call tinf_build_fixed_trees
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xor al, al
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; decode trees from stream
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@@: cmp al, 2
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jne @f
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call tinf_decode_trees
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@@:
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.notst:
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; process current block
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cmp byte [d_btype], 0
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jnz @f
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; decompress uncompressed block
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call tinf_inflate_uncompressed_block
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JMP .procend
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@@: cmp byte [d_btype], 1
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je @f
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cmp byte [d_btype], 2
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jne tinf_err
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; decompress block with fixed/dyanamic huffman trees
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; trees were decoded previously, so it's the same routine for both
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@@: call tinf_inflate_block_data
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.procend: cmp al, 1
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jne @f
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cmp byte [d_bfinal], 0
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; the block has ended (without producing more data), but we
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; can't return without data, so start procesing next block
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jz .next_blk
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ret
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@@: or al, al
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jnz tinf_err
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cmp edi, dword [d_end]
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jbe .again
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ret
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; build the fixed huffman trees
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tinf_build_fixed_trees:
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push edi
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xor ecx, ecx
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xor eax, eax
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; build fixed length tree
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mov cl, 7
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mov edi, d_ltree_table
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repnz stosb
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mov al, 24
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stosb
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mov al, 152
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stosb
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mov al, 112
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stosb
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mov edi, d_ltree_trans
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mov cl, 24
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mov ax, 256
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@@: stosw
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inc ax
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dec cl
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jnz @b
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mov cl, 144
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xor ax, ax
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@@: stosw
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inc ax
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dec cl
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jnz @b
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mov cl, 8
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mov ax, 280
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@@: stosw
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inc ax
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dec cl
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jnz @b
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mov cl, 112
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mov ax, 144
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@@: stosw
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inc ax
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dec cl
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jnz @b
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; build fixed distance tree
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mov cl, 5
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mov edi, d_dtree_table
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xor al, al
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repnz stosb
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mov al, 32
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stosb
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2021-01-15 15:07:25 -05:00
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2018-06-05 14:34:03 -04:00
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mov edi, d_dtree_trans
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mov cl, 32
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xor ax, ax
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@@: stosw
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inc ax
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dec cl
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jnz @b
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pop edi
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ret
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;IN:
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; ebp: TINF_TREE
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; ebx: lengths
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; ecx: num
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tinf_build_tree:
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push edi
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xor eax, eax
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; clear code length count table
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mov edi, ebp
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stosd ; for(i=0;i<16;i++) table[i]=0;
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stosd
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stosd
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stosd
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2021-01-15 15:07:25 -05:00
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2018-06-05 14:34:03 -04:00
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; scan symbol lengths, and sum code length counts
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push ebx
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push ecx
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@@: mov al, byte [ebx] ;lengths[i]
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inc ebx
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inc byte [ebp+eax] ;table[lengths[i]]++
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dec cx
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jnz @b
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mov byte [ebp], 0
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; compute offset table for distribution sort
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mov cl, 16
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xor edx, edx ;i
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xor ebx, ebx ;sum
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xor eax, eax
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@@: mov word [offs+2*edx], bx
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mov al, byte [ebp+edx]
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add ebx, eax
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inc edx
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dec cl
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jnz @b
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pop ecx
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pop ebx ;lengths
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; create code->symbol translation table (symbols sorted by code)
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xor eax, eax ;i
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@@: cmp byte [ebx], 0
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jz .null
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xor edx, edx
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mov dl, byte [ebx] ;lengths[i]
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inc word [offs+2*edx]
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mov dx, word [offs+2*edx]
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dec dx
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mov word [ebp+2*edx+16], ax
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.null: inc ebx
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inc eax
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dec cx
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jnz @b
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pop edi
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ret
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tinf_decode_trees:
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mov word [num], 0
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; get 5 bits HLIT (257-286)
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xor ecx, ecx
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mov cl, 5
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mov ebx, 257
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call tinf_read_bits
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mov word [hlit], ax
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mov word [num], ax
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; get 5 bits HDIST (1-32)
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mov cl, 5
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xor ebx, ebx
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inc ebx
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call tinf_read_bits
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mov word [hdist], ax
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add word [num], ax
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; get 4 bits HCLEN (4-19)
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mov cl, 4
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mov ebx, ecx
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call tinf_read_bits
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mov word [hclen], ax
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push edi
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mov cl, 19
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mov edi, lengths
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xor ax, ax
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repnz stosw
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pop edi
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; read code lengths for code length alphabet
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mov edx, clcidx
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; get 3 bits code length (0-7)
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@@: mov cx, 3
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xor ebx, ebx
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call tinf_read_bits
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xor ebx, ebx
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mov bl, byte [edx] ;clcidx[i]
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mov byte[ebx+lengths], al
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inc edx
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dec word [hclen]
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jnz @b
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; build code length tree, temporarily use length tree
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mov ebp, d_ltree
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mov ebx, lengths
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xor ecx, ecx
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mov cl, 19
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call tinf_build_tree
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2021-01-15 15:07:25 -05:00
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2018-06-05 14:34:03 -04:00
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; decode code lengths for the dynamic trees
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mov edx, lengths
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.decode: mov ebp, d_ltree
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call tinf_decode_symbol
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xor ebx, ebx
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cmp al, 16
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jne .not16
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; copy previous code length 3-6 times (read 2 bits)
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mov cl, 2
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mov bl, 3
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call tinf_read_bits
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mov cx, ax
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mov al, byte [edx-1] ;lengths[num-1]
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@@: mov byte [edx], al
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inc edx
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dec word [num]
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dec cl
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jnz @b
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jmp .next
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.not16: cmp al, 17
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jne .not17
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; repeat code length 0 for 3-10 times (read 3 bits)
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mov cl, 3
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mov bl, cl
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call tinf_read_bits
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mov cx, ax
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@@: mov byte [edx], 0
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inc edx
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dec word [num]
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dec cl
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jnz @b
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jmp .next
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.not17: cmp al, 18
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jne .not18
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; repeat code length 0 for 11-138 times (read 7 bits)
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mov cl, 7
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mov bl, 11
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call tinf_read_bits
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mov cx, ax
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@@: mov byte [edx], 0
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inc edx
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dec word [num]
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dec cl
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jnz @b
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jmp .next
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.not18: ; values 0-15 represent the actual code lengths
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mov byte [edx], al
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inc edx
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dec word [num]
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2021-01-15 15:07:25 -05:00
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2018-06-05 14:34:03 -04:00
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.next: cmp word [num], 0
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jnz .decode
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; build dynamic trees
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mov ebp, d_ltree
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mov ebx, lengths
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xor ecx, ecx
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mov cx, word [hlit]
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call tinf_build_tree
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mov ebp, d_dtree
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mov ebx, lengths
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xor ecx, ecx
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mov cx, word [hlit]
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add ebx, ecx
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mov cx, word [hdist]
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call tinf_build_tree
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ret
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;OUT:
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; al: status
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tinf_inflate_block_data:
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cmp word [d_curlen], 0
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jne .notnull
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mov ebp, d_ltree
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call tinf_decode_symbol
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; literal byte
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cmp ax, 256
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jae @f
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stosb
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xor al, al
|
|
|
|
|
ret
|
|
|
|
|
@@: cmp ax, 256
|
|
|
|
|
jne @f
|
|
|
|
|
; end of block
|
|
|
|
|
mov al, 1
|
|
|
|
|
ret
|
|
|
|
|
@@: ; substring from sliding dictionary
|
|
|
|
|
sub eax, 257
|
|
|
|
|
; possibly get more bits from length code
|
|
|
|
|
xor ecx, ecx
|
|
|
|
|
mov cl, byte [length_bits+eax]
|
|
|
|
|
xor ebx, ebx
|
|
|
|
|
mov bx, word [length_base+2*eax]
|
|
|
|
|
call tinf_read_bits
|
|
|
|
|
mov word [d_curlen], ax
|
|
|
|
|
; possibly get more bits from distance code
|
|
|
|
|
mov ebp, d_dtree
|
|
|
|
|
call tinf_decode_symbol
|
|
|
|
|
xor ecx, ecx
|
|
|
|
|
mov cl, byte [dist_bits+eax]
|
|
|
|
|
xor ebx, ebx
|
|
|
|
|
mov bx, word [dists_base+2*eax]
|
|
|
|
|
call tinf_read_bits
|
|
|
|
|
cmp dword [d_dict_ring], 0
|
|
|
|
|
neg eax
|
|
|
|
|
mov dword [d_lzOff], eax
|
|
|
|
|
.notnull: mov eax, edi
|
|
|
|
|
add eax, dword [d_lzOff]
|
|
|
|
|
mov al, byte [eax]
|
|
|
|
|
stosb
|
|
|
|
|
@@: dec word [d_curlen]
|
|
|
|
|
xor al, al
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
;OUT:
|
|
|
|
|
; al: status
|
|
|
|
|
tinf_inflate_uncompressed_block:
|
|
|
|
|
cmp word [d_curlen], 0
|
|
|
|
|
jne @f
|
|
|
|
|
; get length
|
|
|
|
|
lodsw
|
|
|
|
|
; get one's complement of length
|
|
|
|
|
add esi, 2
|
|
|
|
|
; increment length to properly return TINF_DONE below, without
|
|
|
|
|
; producing data at the same time
|
|
|
|
|
mov word [d_curlen], ax
|
|
|
|
|
inc word [d_curlen]
|
|
|
|
|
; make sure we start next block on a byte boundary
|
|
|
|
|
mov byte [d_bitcount], 0
|
|
|
|
|
@@: dec byte [d_curlen]
|
|
|
|
|
cmp byte [d_curlen], 0
|
|
|
|
|
jnz @f
|
|
|
|
|
mov al, 1
|
|
|
|
|
ret
|
|
|
|
|
@@: movsb
|
|
|
|
|
xor al, al
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
;OUT:
|
|
|
|
|
; al,zeroflag bit
|
|
|
|
|
tinf_getbit:
|
|
|
|
|
mov al, byte [d_bitcount]
|
|
|
|
|
or al, al
|
|
|
|
|
jnz @f
|
|
|
|
|
lodsb
|
|
|
|
|
mov byte [d_tag], al
|
|
|
|
|
mov byte [d_bitcount], 8
|
|
|
|
|
@@: dec byte [d_bitcount]
|
|
|
|
|
xor ax, ax
|
|
|
|
|
shr byte [d_tag], 1
|
|
|
|
|
adc ax, 0
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
;IN:
|
|
|
|
|
; ebx: base
|
|
|
|
|
; cl: num
|
|
|
|
|
;OUT:
|
|
|
|
|
; eax: bits
|
|
|
|
|
tinf_read_bits:
|
|
|
|
|
push edx
|
|
|
|
|
or cl, cl
|
|
|
|
|
jz .end
|
|
|
|
|
xor eax, eax
|
|
|
|
|
xor edx, edx
|
|
|
|
|
inc dl
|
|
|
|
|
.next: call tinf_getbit
|
|
|
|
|
jz @f
|
|
|
|
|
add ebx, edx
|
|
|
|
|
@@: shl edx, 1
|
|
|
|
|
dec cl
|
|
|
|
|
jnz .next
|
|
|
|
|
.end: pop edx
|
|
|
|
|
mov eax, ebx
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
;IN:
|
|
|
|
|
; ebp: TINF_TREE
|
|
|
|
|
;OUT:
|
|
|
|
|
; eax: trans
|
|
|
|
|
tinf_decode_symbol:
|
|
|
|
|
push edx
|
|
|
|
|
xor eax, eax
|
|
|
|
|
xor ebx, ebx ;cur
|
|
|
|
|
xor ecx, ecx ;len
|
|
|
|
|
xor edx, edx ;sum
|
|
|
|
|
; get more bits while code value is above sum
|
|
|
|
|
@@: shl ebx, 1
|
|
|
|
|
call tinf_getbit
|
|
|
|
|
add ebx, eax
|
|
|
|
|
inc ecx
|
|
|
|
|
mov al, byte [ebp+ecx]
|
|
|
|
|
add edx, eax
|
|
|
|
|
sub ebx, eax
|
|
|
|
|
jns @b
|
|
|
|
|
add edx, ebx
|
|
|
|
|
mov ax, word [ebp+2*edx+16]
|
|
|
|
|
mov ebp, edx
|
|
|
|
|
pop edx
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
tinf_err:
|
|
|
|
|
mov esi, nogzip
|
|
|
|
|
jmp prot_diefunc
|
|
|
|
|
|
|
|
|
|
length_bits:
|
|
|
|
|
db 0, 0, 0, 0, 0, 0, 0, 0
|
|
|
|
|
db 1, 1, 1, 1, 2, 2, 2, 2
|
|
|
|
|
db 3, 3, 3, 3, 4, 4, 4, 4
|
|
|
|
|
db 5, 5, 5, 5, 0, 0, 0, 0
|
|
|
|
|
length_base:
|
|
|
|
|
dw 3, 4, 5, 6, 7, 8, 9, 10
|
|
|
|
|
dw 11, 13, 15, 17, 19, 23, 27, 31
|
|
|
|
|
dw 35, 43, 51, 59, 67, 83, 99, 115
|
|
|
|
|
dw 131, 163, 195, 227, 258, 0, 0
|
|
|
|
|
dist_bits:
|
|
|
|
|
db 0, 0, 0, 0, 1, 1, 2, 2
|
|
|
|
|
db 3, 3, 4, 4, 5, 5, 6, 6
|
|
|
|
|
db 7, 7, 8, 8, 9, 9, 10, 10
|
|
|
|
|
db 11, 11, 12, 12, 13, 13, 0, 0
|
|
|
|
|
dists_base:
|
|
|
|
|
dw 1, 2, 3, 4, 5, 7, 9, 13
|
|
|
|
|
dw 17, 25, 33, 49, 65, 97, 129, 193
|
|
|
|
|
dw 257, 385, 513, 769, 1025, 1537, 2049, 3073
|
|
|
|
|
dw 4097, 6145, 8193, 12289, 16385, 24577, 0, 0
|
|
|
|
|
clcidx:
|
|
|
|
|
db 16, 17, 18, 0, 8, 7, 9, 6
|
|
|
|
|
db 10, 5, 11, 4, 12, 3, 13, 2
|
|
|
|
|
db 14, 1, 15
|
|
|
|
|
|
|
|
|
|
d_btype: db 255
|
