1158 lines
40 KiB
C
1158 lines
40 KiB
C
/* inffas86.c is a hand tuned assembler version of
|
|
*
|
|
* inffast.c -- fast decoding
|
|
* Copyright (C) 1995-2003 Mark Adler
|
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
|
*
|
|
* Copyright (C) 2003 Chris Anderson <christop@charm.net>
|
|
* Please use the copyright conditions above.
|
|
*
|
|
* Dec-29-2003 -- I added AMD64 inflate asm support. This version is also
|
|
* slightly quicker on x86 systems because, instead of using rep movsb to copy
|
|
* data, it uses rep movsw, which moves data in 2-byte chunks instead of single
|
|
* bytes. I've tested the AMD64 code on a Fedora Core 1 + the x86_64 updates
|
|
* from http://fedora.linux.duke.edu/fc1_x86_64
|
|
* which is running on an Athlon 64 3000+ / Gigabyte GA-K8VT800M system with
|
|
* 1GB ram. The 64-bit version is about 4% faster than the 32-bit version,
|
|
* when decompressing mozilla-source-1.3.tar.gz.
|
|
*
|
|
* Mar-13-2003 -- Most of this is derived from inffast.S which is derived from
|
|
* the gcc -S output of zlib-1.2.0/inffast.c. Zlib-1.2.0 is in beta release at
|
|
* the moment. I have successfully compiled and tested this code with gcc2.96,
|
|
* gcc3.2, icc5.0, msvc6.0. It is very close to the speed of inffast.S
|
|
* compiled with gcc -DNO_MMX, but inffast.S is still faster on the P3 with MMX
|
|
* enabled. I will attempt to merge the MMX code into this version. Newer
|
|
* versions of this and inffast.S can be found at
|
|
* http://www.eetbeetee.com/zlib/ and http://www.charm.net/~christop/zlib/
|
|
*/
|
|
|
|
#include "zutil.h"
|
|
#include "inftrees.h"
|
|
#include "inflate.h"
|
|
#include "inffast.h"
|
|
|
|
/* Mark Adler's comments from inffast.c: */
|
|
|
|
/*
|
|
Decode literal, length, and distance codes and write out the resulting
|
|
literal and match bytes until either not enough input or output is
|
|
available, an end-of-block is encountered, or a data error is encountered.
|
|
When large enough input and output buffers are supplied to inflate(), for
|
|
example, a 16K input buffer and a 64K output buffer, more than 95% of the
|
|
inflate execution time is spent in this routine.
|
|
|
|
Entry assumptions:
|
|
|
|
state->mode == LEN
|
|
strm->avail_in >= 6
|
|
strm->avail_out >= 258
|
|
start >= strm->avail_out
|
|
state->bits < 8
|
|
|
|
On return, state->mode is one of:
|
|
|
|
LEN -- ran out of enough output space or enough available input
|
|
TYPE -- reached end of block code, inflate() to interpret next block
|
|
BAD -- error in block data
|
|
|
|
Notes:
|
|
|
|
- The maximum input bits used by a length/distance pair is 15 bits for the
|
|
length code, 5 bits for the length extra, 15 bits for the distance code,
|
|
and 13 bits for the distance extra. This totals 48 bits, or six bytes.
|
|
Therefore if strm->avail_in >= 6, then there is enough input to avoid
|
|
checking for available input while decoding.
|
|
|
|
- The maximum bytes that a single length/distance pair can output is 258
|
|
bytes, which is the maximum length that can be coded. inflate_fast()
|
|
requires strm->avail_out >= 258 for each loop to avoid checking for
|
|
output space.
|
|
*/
|
|
void inflate_fast(strm, start)
|
|
z_streamp strm;
|
|
unsigned start; /* inflate()'s starting value for strm->avail_out */
|
|
{
|
|
struct inflate_state FAR *state;
|
|
struct inffast_ar {
|
|
/* 64 32 x86 x86_64 */
|
|
/* ar offset register */
|
|
/* 0 0 */ void *esp; /* esp save */
|
|
/* 8 4 */ void *ebp; /* ebp save */
|
|
/* 16 8 */ unsigned char FAR *in; /* esi rsi local strm->next_in */
|
|
/* 24 12 */ unsigned char FAR *last; /* r9 while in < last */
|
|
/* 32 16 */ unsigned char FAR *out; /* edi rdi local strm->next_out */
|
|
/* 40 20 */ unsigned char FAR *beg; /* inflate()'s init next_out */
|
|
/* 48 24 */ unsigned char FAR *end; /* r10 while out < end */
|
|
/* 56 28 */ unsigned char FAR *window;/* size of window, wsize!=0 */
|
|
/* 64 32 */ code const FAR *lcode; /* ebp rbp local strm->lencode */
|
|
/* 72 36 */ code const FAR *dcode; /* r11 local strm->distcode */
|
|
/* 80 40 */ unsigned long hold; /* edx rdx local strm->hold */
|
|
/* 88 44 */ unsigned bits; /* ebx rbx local strm->bits */
|
|
/* 92 48 */ unsigned wsize; /* window size */
|
|
/* 96 52 */ unsigned write; /* window write index */
|
|
/*100 56 */ unsigned lmask; /* r12 mask for lcode */
|
|
/*104 60 */ unsigned dmask; /* r13 mask for dcode */
|
|
/*108 64 */ unsigned len; /* r14 match length */
|
|
/*112 68 */ unsigned dist; /* r15 match distance */
|
|
/*116 72 */ unsigned status; /* set when state chng*/
|
|
} ar;
|
|
|
|
#if defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 )
|
|
#define PAD_AVAIL_IN 6
|
|
#define PAD_AVAIL_OUT 258
|
|
#else
|
|
#define PAD_AVAIL_IN 5
|
|
#define PAD_AVAIL_OUT 257
|
|
#endif
|
|
|
|
/* copy state to local variables */
|
|
state = (struct inflate_state FAR *)strm->state;
|
|
ar.in = strm->next_in;
|
|
ar.last = ar.in + (strm->avail_in - PAD_AVAIL_IN);
|
|
ar.out = strm->next_out;
|
|
ar.beg = ar.out - (start - strm->avail_out);
|
|
ar.end = ar.out + (strm->avail_out - PAD_AVAIL_OUT);
|
|
ar.wsize = state->wsize;
|
|
ar.write = state->wnext;
|
|
ar.window = state->window;
|
|
ar.hold = state->hold;
|
|
ar.bits = state->bits;
|
|
ar.lcode = state->lencode;
|
|
ar.dcode = state->distcode;
|
|
ar.lmask = (1U << state->lenbits) - 1;
|
|
ar.dmask = (1U << state->distbits) - 1;
|
|
|
|
/* decode literals and length/distances until end-of-block or not enough
|
|
input data or output space */
|
|
|
|
/* align in on 1/2 hold size boundary */
|
|
while (((unsigned long)(void *)ar.in & (sizeof(ar.hold) / 2 - 1)) != 0) {
|
|
ar.hold += (unsigned long)*ar.in++ << ar.bits;
|
|
ar.bits += 8;
|
|
}
|
|
|
|
#if defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 )
|
|
__asm__ __volatile__ (
|
|
" leaq %0, %%rax\n"
|
|
" movq %%rbp, 8(%%rax)\n" /* save regs rbp and rsp */
|
|
" movq %%rsp, (%%rax)\n"
|
|
" movq %%rax, %%rsp\n" /* make rsp point to &ar */
|
|
" movq 16(%%rsp), %%rsi\n" /* rsi = in */
|
|
" movq 32(%%rsp), %%rdi\n" /* rdi = out */
|
|
" movq 24(%%rsp), %%r9\n" /* r9 = last */
|
|
" movq 48(%%rsp), %%r10\n" /* r10 = end */
|
|
" movq 64(%%rsp), %%rbp\n" /* rbp = lcode */
|
|
" movq 72(%%rsp), %%r11\n" /* r11 = dcode */
|
|
" movq 80(%%rsp), %%rdx\n" /* rdx = hold */
|
|
" movl 88(%%rsp), %%ebx\n" /* ebx = bits */
|
|
" movl 100(%%rsp), %%r12d\n" /* r12d = lmask */
|
|
" movl 104(%%rsp), %%r13d\n" /* r13d = dmask */
|
|
/* r14d = len */
|
|
/* r15d = dist */
|
|
" cld\n"
|
|
" cmpq %%rdi, %%r10\n"
|
|
" je .L_one_time\n" /* if only one decode left */
|
|
" cmpq %%rsi, %%r9\n"
|
|
" je .L_one_time\n"
|
|
" jmp .L_do_loop\n"
|
|
|
|
".L_one_time:\n"
|
|
" movq %%r12, %%r8\n" /* r8 = lmask */
|
|
" cmpb $32, %%bl\n"
|
|
" ja .L_get_length_code_one_time\n"
|
|
|
|
" lodsl\n" /* eax = *(uint *)in++ */
|
|
" movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */
|
|
" addb $32, %%bl\n" /* bits += 32 */
|
|
" shlq %%cl, %%rax\n"
|
|
" orq %%rax, %%rdx\n" /* hold |= *((uint *)in)++ << bits */
|
|
" jmp .L_get_length_code_one_time\n"
|
|
|
|
".align 32,0x90\n"
|
|
".L_while_test:\n"
|
|
" cmpq %%rdi, %%r10\n"
|
|
" jbe .L_break_loop\n"
|
|
" cmpq %%rsi, %%r9\n"
|
|
" jbe .L_break_loop\n"
|
|
|
|
".L_do_loop:\n"
|
|
" movq %%r12, %%r8\n" /* r8 = lmask */
|
|
" cmpb $32, %%bl\n"
|
|
" ja .L_get_length_code\n" /* if (32 < bits) */
|
|
|
|
" lodsl\n" /* eax = *(uint *)in++ */
|
|
" movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */
|
|
" addb $32, %%bl\n" /* bits += 32 */
|
|
" shlq %%cl, %%rax\n"
|
|
" orq %%rax, %%rdx\n" /* hold |= *((uint *)in)++ << bits */
|
|
|
|
".L_get_length_code:\n"
|
|
" andq %%rdx, %%r8\n" /* r8 &= hold */
|
|
" movl (%%rbp,%%r8,4), %%eax\n" /* eax = lcode[hold & lmask] */
|
|
|
|
" movb %%ah, %%cl\n" /* cl = this.bits */
|
|
" subb %%ah, %%bl\n" /* bits -= this.bits */
|
|
" shrq %%cl, %%rdx\n" /* hold >>= this.bits */
|
|
|
|
" testb %%al, %%al\n"
|
|
" jnz .L_test_for_length_base\n" /* if (op != 0) 45.7% */
|
|
|
|
" movq %%r12, %%r8\n" /* r8 = lmask */
|
|
" shrl $16, %%eax\n" /* output this.val char */
|
|
" stosb\n"
|
|
|
|
".L_get_length_code_one_time:\n"
|
|
" andq %%rdx, %%r8\n" /* r8 &= hold */
|
|
" movl (%%rbp,%%r8,4), %%eax\n" /* eax = lcode[hold & lmask] */
|
|
|
|
".L_dolen:\n"
|
|
" movb %%ah, %%cl\n" /* cl = this.bits */
|
|
" subb %%ah, %%bl\n" /* bits -= this.bits */
|
|
" shrq %%cl, %%rdx\n" /* hold >>= this.bits */
|
|
|
|
" testb %%al, %%al\n"
|
|
" jnz .L_test_for_length_base\n" /* if (op != 0) 45.7% */
|
|
|
|
" shrl $16, %%eax\n" /* output this.val char */
|
|
" stosb\n"
|
|
" jmp .L_while_test\n"
|
|
|
|
".align 32,0x90\n"
|
|
".L_test_for_length_base:\n"
|
|
" movl %%eax, %%r14d\n" /* len = this */
|
|
" shrl $16, %%r14d\n" /* len = this.val */
|
|
" movb %%al, %%cl\n"
|
|
|
|
" testb $16, %%al\n"
|
|
" jz .L_test_for_second_level_length\n" /* if ((op & 16) == 0) 8% */
|
|
" andb $15, %%cl\n" /* op &= 15 */
|
|
" jz .L_decode_distance\n" /* if (!op) */
|
|
|
|
".L_add_bits_to_len:\n"
|
|
" subb %%cl, %%bl\n"
|
|
" xorl %%eax, %%eax\n"
|
|
" incl %%eax\n"
|
|
" shll %%cl, %%eax\n"
|
|
" decl %%eax\n"
|
|
" andl %%edx, %%eax\n" /* eax &= hold */
|
|
" shrq %%cl, %%rdx\n"
|
|
" addl %%eax, %%r14d\n" /* len += hold & mask[op] */
|
|
|
|
".L_decode_distance:\n"
|
|
" movq %%r13, %%r8\n" /* r8 = dmask */
|
|
" cmpb $32, %%bl\n"
|
|
" ja .L_get_distance_code\n" /* if (32 < bits) */
|
|
|
|
" lodsl\n" /* eax = *(uint *)in++ */
|
|
" movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */
|
|
" addb $32, %%bl\n" /* bits += 32 */
|
|
" shlq %%cl, %%rax\n"
|
|
" orq %%rax, %%rdx\n" /* hold |= *((uint *)in)++ << bits */
|
|
|
|
".L_get_distance_code:\n"
|
|
" andq %%rdx, %%r8\n" /* r8 &= hold */
|
|
" movl (%%r11,%%r8,4), %%eax\n" /* eax = dcode[hold & dmask] */
|
|
|
|
".L_dodist:\n"
|
|
" movl %%eax, %%r15d\n" /* dist = this */
|
|
" shrl $16, %%r15d\n" /* dist = this.val */
|
|
" movb %%ah, %%cl\n"
|
|
" subb %%ah, %%bl\n" /* bits -= this.bits */
|
|
" shrq %%cl, %%rdx\n" /* hold >>= this.bits */
|
|
" movb %%al, %%cl\n" /* cl = this.op */
|
|
|
|
" testb $16, %%al\n" /* if ((op & 16) == 0) */
|
|
" jz .L_test_for_second_level_dist\n"
|
|
" andb $15, %%cl\n" /* op &= 15 */
|
|
" jz .L_check_dist_one\n"
|
|
|
|
".L_add_bits_to_dist:\n"
|
|
" subb %%cl, %%bl\n"
|
|
" xorl %%eax, %%eax\n"
|
|
" incl %%eax\n"
|
|
" shll %%cl, %%eax\n"
|
|
" decl %%eax\n" /* (1 << op) - 1 */
|
|
" andl %%edx, %%eax\n" /* eax &= hold */
|
|
" shrq %%cl, %%rdx\n"
|
|
" addl %%eax, %%r15d\n" /* dist += hold & ((1 << op) - 1) */
|
|
|
|
".L_check_window:\n"
|
|
" movq %%rsi, %%r8\n" /* save in so from can use it's reg */
|
|
" movq %%rdi, %%rax\n"
|
|
" subq 40(%%rsp), %%rax\n" /* nbytes = out - beg */
|
|
|
|
" cmpl %%r15d, %%eax\n"
|
|
" jb .L_clip_window\n" /* if (dist > nbytes) 4.2% */
|
|
|
|
" movl %%r14d, %%ecx\n" /* ecx = len */
|
|
" movq %%rdi, %%rsi\n"
|
|
" subq %%r15, %%rsi\n" /* from = out - dist */
|
|
|
|
" sarl %%ecx\n"
|
|
" jnc .L_copy_two\n" /* if len % 2 == 0 */
|
|
|
|
" rep movsw\n"
|
|
" movb (%%rsi), %%al\n"
|
|
" movb %%al, (%%rdi)\n"
|
|
" incq %%rdi\n"
|
|
|
|
" movq %%r8, %%rsi\n" /* move in back to %rsi, toss from */
|
|
" jmp .L_while_test\n"
|
|
|
|
".L_copy_two:\n"
|
|
" rep movsw\n"
|
|
" movq %%r8, %%rsi\n" /* move in back to %rsi, toss from */
|
|
" jmp .L_while_test\n"
|
|
|
|
".align 32,0x90\n"
|
|
".L_check_dist_one:\n"
|
|
" cmpl $1, %%r15d\n" /* if dist 1, is a memset */
|
|
" jne .L_check_window\n"
|
|
" cmpq %%rdi, 40(%%rsp)\n" /* if out == beg, outside window */
|
|
" je .L_check_window\n"
|
|
|
|
" movl %%r14d, %%ecx\n" /* ecx = len */
|
|
" movb -1(%%rdi), %%al\n"
|
|
" movb %%al, %%ah\n"
|
|
|
|
" sarl %%ecx\n"
|
|
" jnc .L_set_two\n"
|
|
" movb %%al, (%%rdi)\n"
|
|
" incq %%rdi\n"
|
|
|
|
".L_set_two:\n"
|
|
" rep stosw\n"
|
|
" jmp .L_while_test\n"
|
|
|
|
".align 32,0x90\n"
|
|
".L_test_for_second_level_length:\n"
|
|
" testb $64, %%al\n"
|
|
" jnz .L_test_for_end_of_block\n" /* if ((op & 64) != 0) */
|
|
|
|
" xorl %%eax, %%eax\n"
|
|
" incl %%eax\n"
|
|
" shll %%cl, %%eax\n"
|
|
" decl %%eax\n"
|
|
" andl %%edx, %%eax\n" /* eax &= hold */
|
|
" addl %%r14d, %%eax\n" /* eax += len */
|
|
" movl (%%rbp,%%rax,4), %%eax\n" /* eax = lcode[val+(hold&mask[op])]*/
|
|
" jmp .L_dolen\n"
|
|
|
|
".align 32,0x90\n"
|
|
".L_test_for_second_level_dist:\n"
|
|
" testb $64, %%al\n"
|
|
" jnz .L_invalid_distance_code\n" /* if ((op & 64) != 0) */
|
|
|
|
" xorl %%eax, %%eax\n"
|
|
" incl %%eax\n"
|
|
" shll %%cl, %%eax\n"
|
|
" decl %%eax\n"
|
|
" andl %%edx, %%eax\n" /* eax &= hold */
|
|
" addl %%r15d, %%eax\n" /* eax += dist */
|
|
" movl (%%r11,%%rax,4), %%eax\n" /* eax = dcode[val+(hold&mask[op])]*/
|
|
" jmp .L_dodist\n"
|
|
|
|
".align 32,0x90\n"
|
|
".L_clip_window:\n"
|
|
" movl %%eax, %%ecx\n" /* ecx = nbytes */
|
|
" movl 92(%%rsp), %%eax\n" /* eax = wsize, prepare for dist cmp */
|
|
" negl %%ecx\n" /* nbytes = -nbytes */
|
|
|
|
" cmpl %%r15d, %%eax\n"
|
|
" jb .L_invalid_distance_too_far\n" /* if (dist > wsize) */
|
|
|
|
" addl %%r15d, %%ecx\n" /* nbytes = dist - nbytes */
|
|
" cmpl $0, 96(%%rsp)\n"
|
|
" jne .L_wrap_around_window\n" /* if (write != 0) */
|
|
|
|
" movq 56(%%rsp), %%rsi\n" /* from = window */
|
|
" subl %%ecx, %%eax\n" /* eax -= nbytes */
|
|
" addq %%rax, %%rsi\n" /* from += wsize - nbytes */
|
|
|
|
" movl %%r14d, %%eax\n" /* eax = len */
|
|
" cmpl %%ecx, %%r14d\n"
|
|
" jbe .L_do_copy\n" /* if (nbytes >= len) */
|
|
|
|
" subl %%ecx, %%eax\n" /* eax -= nbytes */
|
|
" rep movsb\n"
|
|
" movq %%rdi, %%rsi\n"
|
|
" subq %%r15, %%rsi\n" /* from = &out[ -dist ] */
|
|
" jmp .L_do_copy\n"
|
|
|
|
".align 32,0x90\n"
|
|
".L_wrap_around_window:\n"
|
|
" movl 96(%%rsp), %%eax\n" /* eax = write */
|
|
" cmpl %%eax, %%ecx\n"
|
|
" jbe .L_contiguous_in_window\n" /* if (write >= nbytes) */
|
|
|
|
" movl 92(%%rsp), %%esi\n" /* from = wsize */
|
|
" addq 56(%%rsp), %%rsi\n" /* from += window */
|
|
" addq %%rax, %%rsi\n" /* from += write */
|
|
" subq %%rcx, %%rsi\n" /* from -= nbytes */
|
|
" subl %%eax, %%ecx\n" /* nbytes -= write */
|
|
|
|
" movl %%r14d, %%eax\n" /* eax = len */
|
|
" cmpl %%ecx, %%eax\n"
|
|
" jbe .L_do_copy\n" /* if (nbytes >= len) */
|
|
|
|
" subl %%ecx, %%eax\n" /* len -= nbytes */
|
|
" rep movsb\n"
|
|
" movq 56(%%rsp), %%rsi\n" /* from = window */
|
|
" movl 96(%%rsp), %%ecx\n" /* nbytes = write */
|
|
" cmpl %%ecx, %%eax\n"
|
|
" jbe .L_do_copy\n" /* if (nbytes >= len) */
|
|
|
|
" subl %%ecx, %%eax\n" /* len -= nbytes */
|
|
" rep movsb\n"
|
|
" movq %%rdi, %%rsi\n"
|
|
" subq %%r15, %%rsi\n" /* from = out - dist */
|
|
" jmp .L_do_copy\n"
|
|
|
|
".align 32,0x90\n"
|
|
".L_contiguous_in_window:\n"
|
|
" movq 56(%%rsp), %%rsi\n" /* rsi = window */
|
|
" addq %%rax, %%rsi\n"
|
|
" subq %%rcx, %%rsi\n" /* from += write - nbytes */
|
|
|
|
" movl %%r14d, %%eax\n" /* eax = len */
|
|
" cmpl %%ecx, %%eax\n"
|
|
" jbe .L_do_copy\n" /* if (nbytes >= len) */
|
|
|
|
" subl %%ecx, %%eax\n" /* len -= nbytes */
|
|
" rep movsb\n"
|
|
" movq %%rdi, %%rsi\n"
|
|
" subq %%r15, %%rsi\n" /* from = out - dist */
|
|
" jmp .L_do_copy\n" /* if (nbytes >= len) */
|
|
|
|
".align 32,0x90\n"
|
|
".L_do_copy:\n"
|
|
" movl %%eax, %%ecx\n" /* ecx = len */
|
|
" rep movsb\n"
|
|
|
|
" movq %%r8, %%rsi\n" /* move in back to %esi, toss from */
|
|
" jmp .L_while_test\n"
|
|
|
|
".L_test_for_end_of_block:\n"
|
|
" testb $32, %%al\n"
|
|
" jz .L_invalid_literal_length_code\n"
|
|
" movl $1, 116(%%rsp)\n"
|
|
" jmp .L_break_loop_with_status\n"
|
|
|
|
".L_invalid_literal_length_code:\n"
|
|
" movl $2, 116(%%rsp)\n"
|
|
" jmp .L_break_loop_with_status\n"
|
|
|
|
".L_invalid_distance_code:\n"
|
|
" movl $3, 116(%%rsp)\n"
|
|
" jmp .L_break_loop_with_status\n"
|
|
|
|
".L_invalid_distance_too_far:\n"
|
|
" movl $4, 116(%%rsp)\n"
|
|
" jmp .L_break_loop_with_status\n"
|
|
|
|
".L_break_loop:\n"
|
|
" movl $0, 116(%%rsp)\n"
|
|
|
|
".L_break_loop_with_status:\n"
|
|
/* put in, out, bits, and hold back into ar and pop esp */
|
|
" movq %%rsi, 16(%%rsp)\n" /* in */
|
|
" movq %%rdi, 32(%%rsp)\n" /* out */
|
|
" movl %%ebx, 88(%%rsp)\n" /* bits */
|
|
" movq %%rdx, 80(%%rsp)\n" /* hold */
|
|
" movq (%%rsp), %%rax\n" /* restore rbp and rsp */
|
|
" movq 8(%%rsp), %%rbp\n"
|
|
" movq %%rax, %%rsp\n"
|
|
:
|
|
: "m" (ar)
|
|
: "memory", "%rax", "%rbx", "%rcx", "%rdx", "%rsi", "%rdi",
|
|
"%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15"
|
|
);
|
|
#elif ( defined( __GNUC__ ) || defined( __ICC ) ) && defined( __i386 )
|
|
__asm__ __volatile__ (
|
|
" leal %0, %%eax\n"
|
|
" movl %%esp, (%%eax)\n" /* save esp, ebp */
|
|
" movl %%ebp, 4(%%eax)\n"
|
|
" movl %%eax, %%esp\n"
|
|
" movl 8(%%esp), %%esi\n" /* esi = in */
|
|
" movl 16(%%esp), %%edi\n" /* edi = out */
|
|
" movl 40(%%esp), %%edx\n" /* edx = hold */
|
|
" movl 44(%%esp), %%ebx\n" /* ebx = bits */
|
|
" movl 32(%%esp), %%ebp\n" /* ebp = lcode */
|
|
|
|
" cld\n"
|
|
" jmp .L_do_loop\n"
|
|
|
|
".align 32,0x90\n"
|
|
".L_while_test:\n"
|
|
" cmpl %%edi, 24(%%esp)\n" /* out < end */
|
|
" jbe .L_break_loop\n"
|
|
" cmpl %%esi, 12(%%esp)\n" /* in < last */
|
|
" jbe .L_break_loop\n"
|
|
|
|
".L_do_loop:\n"
|
|
" cmpb $15, %%bl\n"
|
|
" ja .L_get_length_code\n" /* if (15 < bits) */
|
|
|
|
" xorl %%eax, %%eax\n"
|
|
" lodsw\n" /* al = *(ushort *)in++ */
|
|
" movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */
|
|
" addb $16, %%bl\n" /* bits += 16 */
|
|
" shll %%cl, %%eax\n"
|
|
" orl %%eax, %%edx\n" /* hold |= *((ushort *)in)++ << bits */
|
|
|
|
".L_get_length_code:\n"
|
|
" movl 56(%%esp), %%eax\n" /* eax = lmask */
|
|
" andl %%edx, %%eax\n" /* eax &= hold */
|
|
" movl (%%ebp,%%eax,4), %%eax\n" /* eax = lcode[hold & lmask] */
|
|
|
|
".L_dolen:\n"
|
|
" movb %%ah, %%cl\n" /* cl = this.bits */
|
|
" subb %%ah, %%bl\n" /* bits -= this.bits */
|
|
" shrl %%cl, %%edx\n" /* hold >>= this.bits */
|
|
|
|
" testb %%al, %%al\n"
|
|
" jnz .L_test_for_length_base\n" /* if (op != 0) 45.7% */
|
|
|
|
" shrl $16, %%eax\n" /* output this.val char */
|
|
" stosb\n"
|
|
" jmp .L_while_test\n"
|
|
|
|
".align 32,0x90\n"
|
|
".L_test_for_length_base:\n"
|
|
" movl %%eax, %%ecx\n" /* len = this */
|
|
" shrl $16, %%ecx\n" /* len = this.val */
|
|
" movl %%ecx, 64(%%esp)\n" /* save len */
|
|
" movb %%al, %%cl\n"
|
|
|
|
" testb $16, %%al\n"
|
|
" jz .L_test_for_second_level_length\n" /* if ((op & 16) == 0) 8% */
|
|
" andb $15, %%cl\n" /* op &= 15 */
|
|
" jz .L_decode_distance\n" /* if (!op) */
|
|
" cmpb %%cl, %%bl\n"
|
|
" jae .L_add_bits_to_len\n" /* if (op <= bits) */
|
|
|
|
" movb %%cl, %%ch\n" /* stash op in ch, freeing cl */
|
|
" xorl %%eax, %%eax\n"
|
|
" lodsw\n" /* al = *(ushort *)in++ */
|
|
" movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */
|
|
" addb $16, %%bl\n" /* bits += 16 */
|
|
" shll %%cl, %%eax\n"
|
|
" orl %%eax, %%edx\n" /* hold |= *((ushort *)in)++ << bits */
|
|
" movb %%ch, %%cl\n" /* move op back to ecx */
|
|
|
|
".L_add_bits_to_len:\n"
|
|
" subb %%cl, %%bl\n"
|
|
" xorl %%eax, %%eax\n"
|
|
" incl %%eax\n"
|
|
" shll %%cl, %%eax\n"
|
|
" decl %%eax\n"
|
|
" andl %%edx, %%eax\n" /* eax &= hold */
|
|
" shrl %%cl, %%edx\n"
|
|
" addl %%eax, 64(%%esp)\n" /* len += hold & mask[op] */
|
|
|
|
".L_decode_distance:\n"
|
|
" cmpb $15, %%bl\n"
|
|
" ja .L_get_distance_code\n" /* if (15 < bits) */
|
|
|
|
" xorl %%eax, %%eax\n"
|
|
" lodsw\n" /* al = *(ushort *)in++ */
|
|
" movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */
|
|
" addb $16, %%bl\n" /* bits += 16 */
|
|
" shll %%cl, %%eax\n"
|
|
" orl %%eax, %%edx\n" /* hold |= *((ushort *)in)++ << bits */
|
|
|
|
".L_get_distance_code:\n"
|
|
" movl 60(%%esp), %%eax\n" /* eax = dmask */
|
|
" movl 36(%%esp), %%ecx\n" /* ecx = dcode */
|
|
" andl %%edx, %%eax\n" /* eax &= hold */
|
|
" movl (%%ecx,%%eax,4), %%eax\n"/* eax = dcode[hold & dmask] */
|
|
|
|
".L_dodist:\n"
|
|
" movl %%eax, %%ebp\n" /* dist = this */
|
|
" shrl $16, %%ebp\n" /* dist = this.val */
|
|
" movb %%ah, %%cl\n"
|
|
" subb %%ah, %%bl\n" /* bits -= this.bits */
|
|
" shrl %%cl, %%edx\n" /* hold >>= this.bits */
|
|
" movb %%al, %%cl\n" /* cl = this.op */
|
|
|
|
" testb $16, %%al\n" /* if ((op & 16) == 0) */
|
|
" jz .L_test_for_second_level_dist\n"
|
|
" andb $15, %%cl\n" /* op &= 15 */
|
|
" jz .L_check_dist_one\n"
|
|
" cmpb %%cl, %%bl\n"
|
|
" jae .L_add_bits_to_dist\n" /* if (op <= bits) 97.6% */
|
|
|
|
" movb %%cl, %%ch\n" /* stash op in ch, freeing cl */
|
|
" xorl %%eax, %%eax\n"
|
|
" lodsw\n" /* al = *(ushort *)in++ */
|
|
" movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */
|
|
" addb $16, %%bl\n" /* bits += 16 */
|
|
" shll %%cl, %%eax\n"
|
|
" orl %%eax, %%edx\n" /* hold |= *((ushort *)in)++ << bits */
|
|
" movb %%ch, %%cl\n" /* move op back to ecx */
|
|
|
|
".L_add_bits_to_dist:\n"
|
|
" subb %%cl, %%bl\n"
|
|
" xorl %%eax, %%eax\n"
|
|
" incl %%eax\n"
|
|
" shll %%cl, %%eax\n"
|
|
" decl %%eax\n" /* (1 << op) - 1 */
|
|
" andl %%edx, %%eax\n" /* eax &= hold */
|
|
" shrl %%cl, %%edx\n"
|
|
" addl %%eax, %%ebp\n" /* dist += hold & ((1 << op) - 1) */
|
|
|
|
".L_check_window:\n"
|
|
" movl %%esi, 8(%%esp)\n" /* save in so from can use it's reg */
|
|
" movl %%edi, %%eax\n"
|
|
" subl 20(%%esp), %%eax\n" /* nbytes = out - beg */
|
|
|
|
" cmpl %%ebp, %%eax\n"
|
|
" jb .L_clip_window\n" /* if (dist > nbytes) 4.2% */
|
|
|
|
" movl 64(%%esp), %%ecx\n" /* ecx = len */
|
|
" movl %%edi, %%esi\n"
|
|
" subl %%ebp, %%esi\n" /* from = out - dist */
|
|
|
|
" sarl %%ecx\n"
|
|
" jnc .L_copy_two\n" /* if len % 2 == 0 */
|
|
|
|
" rep movsw\n"
|
|
" movb (%%esi), %%al\n"
|
|
" movb %%al, (%%edi)\n"
|
|
" incl %%edi\n"
|
|
|
|
" movl 8(%%esp), %%esi\n" /* move in back to %esi, toss from */
|
|
" movl 32(%%esp), %%ebp\n" /* ebp = lcode */
|
|
" jmp .L_while_test\n"
|
|
|
|
".L_copy_two:\n"
|
|
" rep movsw\n"
|
|
" movl 8(%%esp), %%esi\n" /* move in back to %esi, toss from */
|
|
" movl 32(%%esp), %%ebp\n" /* ebp = lcode */
|
|
" jmp .L_while_test\n"
|
|
|
|
".align 32,0x90\n"
|
|
".L_check_dist_one:\n"
|
|
" cmpl $1, %%ebp\n" /* if dist 1, is a memset */
|
|
" jne .L_check_window\n"
|
|
" cmpl %%edi, 20(%%esp)\n"
|
|
" je .L_check_window\n" /* out == beg, if outside window */
|
|
|
|
" movl 64(%%esp), %%ecx\n" /* ecx = len */
|
|
" movb -1(%%edi), %%al\n"
|
|
" movb %%al, %%ah\n"
|
|
|
|
" sarl %%ecx\n"
|
|
" jnc .L_set_two\n"
|
|
" movb %%al, (%%edi)\n"
|
|
" incl %%edi\n"
|
|
|
|
".L_set_two:\n"
|
|
" rep stosw\n"
|
|
" movl 32(%%esp), %%ebp\n" /* ebp = lcode */
|
|
" jmp .L_while_test\n"
|
|
|
|
".align 32,0x90\n"
|
|
".L_test_for_second_level_length:\n"
|
|
" testb $64, %%al\n"
|
|
" jnz .L_test_for_end_of_block\n" /* if ((op & 64) != 0) */
|
|
|
|
" xorl %%eax, %%eax\n"
|
|
" incl %%eax\n"
|
|
" shll %%cl, %%eax\n"
|
|
" decl %%eax\n"
|
|
" andl %%edx, %%eax\n" /* eax &= hold */
|
|
" addl 64(%%esp), %%eax\n" /* eax += len */
|
|
" movl (%%ebp,%%eax,4), %%eax\n" /* eax = lcode[val+(hold&mask[op])]*/
|
|
" jmp .L_dolen\n"
|
|
|
|
".align 32,0x90\n"
|
|
".L_test_for_second_level_dist:\n"
|
|
" testb $64, %%al\n"
|
|
" jnz .L_invalid_distance_code\n" /* if ((op & 64) != 0) */
|
|
|
|
" xorl %%eax, %%eax\n"
|
|
" incl %%eax\n"
|
|
" shll %%cl, %%eax\n"
|
|
" decl %%eax\n"
|
|
" andl %%edx, %%eax\n" /* eax &= hold */
|
|
" addl %%ebp, %%eax\n" /* eax += dist */
|
|
" movl 36(%%esp), %%ecx\n" /* ecx = dcode */
|
|
" movl (%%ecx,%%eax,4), %%eax\n" /* eax = dcode[val+(hold&mask[op])]*/
|
|
" jmp .L_dodist\n"
|
|
|
|
".align 32,0x90\n"
|
|
".L_clip_window:\n"
|
|
" movl %%eax, %%ecx\n"
|
|
" movl 48(%%esp), %%eax\n" /* eax = wsize */
|
|
" negl %%ecx\n" /* nbytes = -nbytes */
|
|
" movl 28(%%esp), %%esi\n" /* from = window */
|
|
|
|
" cmpl %%ebp, %%eax\n"
|
|
" jb .L_invalid_distance_too_far\n" /* if (dist > wsize) */
|
|
|
|
" addl %%ebp, %%ecx\n" /* nbytes = dist - nbytes */
|
|
" cmpl $0, 52(%%esp)\n"
|
|
" jne .L_wrap_around_window\n" /* if (write != 0) */
|
|
|
|
" subl %%ecx, %%eax\n"
|
|
" addl %%eax, %%esi\n" /* from += wsize - nbytes */
|
|
|
|
" movl 64(%%esp), %%eax\n" /* eax = len */
|
|
" cmpl %%ecx, %%eax\n"
|
|
" jbe .L_do_copy\n" /* if (nbytes >= len) */
|
|
|
|
" subl %%ecx, %%eax\n" /* len -= nbytes */
|
|
" rep movsb\n"
|
|
" movl %%edi, %%esi\n"
|
|
" subl %%ebp, %%esi\n" /* from = out - dist */
|
|
" jmp .L_do_copy\n"
|
|
|
|
".align 32,0x90\n"
|
|
".L_wrap_around_window:\n"
|
|
" movl 52(%%esp), %%eax\n" /* eax = write */
|
|
" cmpl %%eax, %%ecx\n"
|
|
" jbe .L_contiguous_in_window\n" /* if (write >= nbytes) */
|
|
|
|
" addl 48(%%esp), %%esi\n" /* from += wsize */
|
|
" addl %%eax, %%esi\n" /* from += write */
|
|
" subl %%ecx, %%esi\n" /* from -= nbytes */
|
|
" subl %%eax, %%ecx\n" /* nbytes -= write */
|
|
|
|
" movl 64(%%esp), %%eax\n" /* eax = len */
|
|
" cmpl %%ecx, %%eax\n"
|
|
" jbe .L_do_copy\n" /* if (nbytes >= len) */
|
|
|
|
" subl %%ecx, %%eax\n" /* len -= nbytes */
|
|
" rep movsb\n"
|
|
" movl 28(%%esp), %%esi\n" /* from = window */
|
|
" movl 52(%%esp), %%ecx\n" /* nbytes = write */
|
|
" cmpl %%ecx, %%eax\n"
|
|
" jbe .L_do_copy\n" /* if (nbytes >= len) */
|
|
|
|
" subl %%ecx, %%eax\n" /* len -= nbytes */
|
|
" rep movsb\n"
|
|
" movl %%edi, %%esi\n"
|
|
" subl %%ebp, %%esi\n" /* from = out - dist */
|
|
" jmp .L_do_copy\n"
|
|
|
|
".align 32,0x90\n"
|
|
".L_contiguous_in_window:\n"
|
|
" addl %%eax, %%esi\n"
|
|
" subl %%ecx, %%esi\n" /* from += write - nbytes */
|
|
|
|
" movl 64(%%esp), %%eax\n" /* eax = len */
|
|
" cmpl %%ecx, %%eax\n"
|
|
" jbe .L_do_copy\n" /* if (nbytes >= len) */
|
|
|
|
" subl %%ecx, %%eax\n" /* len -= nbytes */
|
|
" rep movsb\n"
|
|
" movl %%edi, %%esi\n"
|
|
" subl %%ebp, %%esi\n" /* from = out - dist */
|
|
" jmp .L_do_copy\n" /* if (nbytes >= len) */
|
|
|
|
".align 32,0x90\n"
|
|
".L_do_copy:\n"
|
|
" movl %%eax, %%ecx\n"
|
|
" rep movsb\n"
|
|
|
|
" movl 8(%%esp), %%esi\n" /* move in back to %esi, toss from */
|
|
" movl 32(%%esp), %%ebp\n" /* ebp = lcode */
|
|
" jmp .L_while_test\n"
|
|
|
|
".L_test_for_end_of_block:\n"
|
|
" testb $32, %%al\n"
|
|
" jz .L_invalid_literal_length_code\n"
|
|
" movl $1, 72(%%esp)\n"
|
|
" jmp .L_break_loop_with_status\n"
|
|
|
|
".L_invalid_literal_length_code:\n"
|
|
" movl $2, 72(%%esp)\n"
|
|
" jmp .L_break_loop_with_status\n"
|
|
|
|
".L_invalid_distance_code:\n"
|
|
" movl $3, 72(%%esp)\n"
|
|
" jmp .L_break_loop_with_status\n"
|
|
|
|
".L_invalid_distance_too_far:\n"
|
|
" movl 8(%%esp), %%esi\n"
|
|
" movl $4, 72(%%esp)\n"
|
|
" jmp .L_break_loop_with_status\n"
|
|
|
|
".L_break_loop:\n"
|
|
" movl $0, 72(%%esp)\n"
|
|
|
|
".L_break_loop_with_status:\n"
|
|
/* put in, out, bits, and hold back into ar and pop esp */
|
|
" movl %%esi, 8(%%esp)\n" /* save in */
|
|
" movl %%edi, 16(%%esp)\n" /* save out */
|
|
" movl %%ebx, 44(%%esp)\n" /* save bits */
|
|
" movl %%edx, 40(%%esp)\n" /* save hold */
|
|
" movl 4(%%esp), %%ebp\n" /* restore esp, ebp */
|
|
" movl (%%esp), %%esp\n"
|
|
:
|
|
: "m" (ar)
|
|
: "memory", "%eax", "%ebx", "%ecx", "%edx", "%esi", "%edi"
|
|
);
|
|
#elif defined( _MSC_VER ) && ! defined( _M_AMD64 )
|
|
__asm {
|
|
lea eax, ar
|
|
mov [eax], esp /* save esp, ebp */
|
|
mov [eax+4], ebp
|
|
mov esp, eax
|
|
mov esi, [esp+8] /* esi = in */
|
|
mov edi, [esp+16] /* edi = out */
|
|
mov edx, [esp+40] /* edx = hold */
|
|
mov ebx, [esp+44] /* ebx = bits */
|
|
mov ebp, [esp+32] /* ebp = lcode */
|
|
|
|
cld
|
|
jmp L_do_loop
|
|
|
|
ALIGN 4
|
|
L_while_test:
|
|
cmp [esp+24], edi
|
|
jbe L_break_loop
|
|
cmp [esp+12], esi
|
|
jbe L_break_loop
|
|
|
|
L_do_loop:
|
|
cmp bl, 15
|
|
ja L_get_length_code /* if (15 < bits) */
|
|
|
|
xor eax, eax
|
|
lodsw /* al = *(ushort *)in++ */
|
|
mov cl, bl /* cl = bits, needs it for shifting */
|
|
add bl, 16 /* bits += 16 */
|
|
shl eax, cl
|
|
or edx, eax /* hold |= *((ushort *)in)++ << bits */
|
|
|
|
L_get_length_code:
|
|
mov eax, [esp+56] /* eax = lmask */
|
|
and eax, edx /* eax &= hold */
|
|
mov eax, [ebp+eax*4] /* eax = lcode[hold & lmask] */
|
|
|
|
L_dolen:
|
|
mov cl, ah /* cl = this.bits */
|
|
sub bl, ah /* bits -= this.bits */
|
|
shr edx, cl /* hold >>= this.bits */
|
|
|
|
test al, al
|
|
jnz L_test_for_length_base /* if (op != 0) 45.7% */
|
|
|
|
shr eax, 16 /* output this.val char */
|
|
stosb
|
|
jmp L_while_test
|
|
|
|
ALIGN 4
|
|
L_test_for_length_base:
|
|
mov ecx, eax /* len = this */
|
|
shr ecx, 16 /* len = this.val */
|
|
mov [esp+64], ecx /* save len */
|
|
mov cl, al
|
|
|
|
test al, 16
|
|
jz L_test_for_second_level_length /* if ((op & 16) == 0) 8% */
|
|
and cl, 15 /* op &= 15 */
|
|
jz L_decode_distance /* if (!op) */
|
|
cmp bl, cl
|
|
jae L_add_bits_to_len /* if (op <= bits) */
|
|
|
|
mov ch, cl /* stash op in ch, freeing cl */
|
|
xor eax, eax
|
|
lodsw /* al = *(ushort *)in++ */
|
|
mov cl, bl /* cl = bits, needs it for shifting */
|
|
add bl, 16 /* bits += 16 */
|
|
shl eax, cl
|
|
or edx, eax /* hold |= *((ushort *)in)++ << bits */
|
|
mov cl, ch /* move op back to ecx */
|
|
|
|
L_add_bits_to_len:
|
|
sub bl, cl
|
|
xor eax, eax
|
|
inc eax
|
|
shl eax, cl
|
|
dec eax
|
|
and eax, edx /* eax &= hold */
|
|
shr edx, cl
|
|
add [esp+64], eax /* len += hold & mask[op] */
|
|
|
|
L_decode_distance:
|
|
cmp bl, 15
|
|
ja L_get_distance_code /* if (15 < bits) */
|
|
|
|
xor eax, eax
|
|
lodsw /* al = *(ushort *)in++ */
|
|
mov cl, bl /* cl = bits, needs it for shifting */
|
|
add bl, 16 /* bits += 16 */
|
|
shl eax, cl
|
|
or edx, eax /* hold |= *((ushort *)in)++ << bits */
|
|
|
|
L_get_distance_code:
|
|
mov eax, [esp+60] /* eax = dmask */
|
|
mov ecx, [esp+36] /* ecx = dcode */
|
|
and eax, edx /* eax &= hold */
|
|
mov eax, [ecx+eax*4]/* eax = dcode[hold & dmask] */
|
|
|
|
L_dodist:
|
|
mov ebp, eax /* dist = this */
|
|
shr ebp, 16 /* dist = this.val */
|
|
mov cl, ah
|
|
sub bl, ah /* bits -= this.bits */
|
|
shr edx, cl /* hold >>= this.bits */
|
|
mov cl, al /* cl = this.op */
|
|
|
|
test al, 16 /* if ((op & 16) == 0) */
|
|
jz L_test_for_second_level_dist
|
|
and cl, 15 /* op &= 15 */
|
|
jz L_check_dist_one
|
|
cmp bl, cl
|
|
jae L_add_bits_to_dist /* if (op <= bits) 97.6% */
|
|
|
|
mov ch, cl /* stash op in ch, freeing cl */
|
|
xor eax, eax
|
|
lodsw /* al = *(ushort *)in++ */
|
|
mov cl, bl /* cl = bits, needs it for shifting */
|
|
add bl, 16 /* bits += 16 */
|
|
shl eax, cl
|
|
or edx, eax /* hold |= *((ushort *)in)++ << bits */
|
|
mov cl, ch /* move op back to ecx */
|
|
|
|
L_add_bits_to_dist:
|
|
sub bl, cl
|
|
xor eax, eax
|
|
inc eax
|
|
shl eax, cl
|
|
dec eax /* (1 << op) - 1 */
|
|
and eax, edx /* eax &= hold */
|
|
shr edx, cl
|
|
add ebp, eax /* dist += hold & ((1 << op) - 1) */
|
|
|
|
L_check_window:
|
|
mov [esp+8], esi /* save in so from can use it's reg */
|
|
mov eax, edi
|
|
sub eax, [esp+20] /* nbytes = out - beg */
|
|
|
|
cmp eax, ebp
|
|
jb L_clip_window /* if (dist > nbytes) 4.2% */
|
|
|
|
mov ecx, [esp+64] /* ecx = len */
|
|
mov esi, edi
|
|
sub esi, ebp /* from = out - dist */
|
|
|
|
sar ecx, 1
|
|
jnc L_copy_two
|
|
|
|
rep movsw
|
|
mov al, [esi]
|
|
mov [edi], al
|
|
inc edi
|
|
|
|
mov esi, [esp+8] /* move in back to %esi, toss from */
|
|
mov ebp, [esp+32] /* ebp = lcode */
|
|
jmp L_while_test
|
|
|
|
L_copy_two:
|
|
rep movsw
|
|
mov esi, [esp+8] /* move in back to %esi, toss from */
|
|
mov ebp, [esp+32] /* ebp = lcode */
|
|
jmp L_while_test
|
|
|
|
ALIGN 4
|
|
L_check_dist_one:
|
|
cmp ebp, 1 /* if dist 1, is a memset */
|
|
jne L_check_window
|
|
cmp [esp+20], edi
|
|
je L_check_window /* out == beg, if outside window */
|
|
|
|
mov ecx, [esp+64] /* ecx = len */
|
|
mov al, [edi-1]
|
|
mov ah, al
|
|
|
|
sar ecx, 1
|
|
jnc L_set_two
|
|
mov [edi], al /* memset out with from[-1] */
|
|
inc edi
|
|
|
|
L_set_two:
|
|
rep stosw
|
|
mov ebp, [esp+32] /* ebp = lcode */
|
|
jmp L_while_test
|
|
|
|
ALIGN 4
|
|
L_test_for_second_level_length:
|
|
test al, 64
|
|
jnz L_test_for_end_of_block /* if ((op & 64) != 0) */
|
|
|
|
xor eax, eax
|
|
inc eax
|
|
shl eax, cl
|
|
dec eax
|
|
and eax, edx /* eax &= hold */
|
|
add eax, [esp+64] /* eax += len */
|
|
mov eax, [ebp+eax*4] /* eax = lcode[val+(hold&mask[op])]*/
|
|
jmp L_dolen
|
|
|
|
ALIGN 4
|
|
L_test_for_second_level_dist:
|
|
test al, 64
|
|
jnz L_invalid_distance_code /* if ((op & 64) != 0) */
|
|
|
|
xor eax, eax
|
|
inc eax
|
|
shl eax, cl
|
|
dec eax
|
|
and eax, edx /* eax &= hold */
|
|
add eax, ebp /* eax += dist */
|
|
mov ecx, [esp+36] /* ecx = dcode */
|
|
mov eax, [ecx+eax*4] /* eax = dcode[val+(hold&mask[op])]*/
|
|
jmp L_dodist
|
|
|
|
ALIGN 4
|
|
L_clip_window:
|
|
mov ecx, eax
|
|
mov eax, [esp+48] /* eax = wsize */
|
|
neg ecx /* nbytes = -nbytes */
|
|
mov esi, [esp+28] /* from = window */
|
|
|
|
cmp eax, ebp
|
|
jb L_invalid_distance_too_far /* if (dist > wsize) */
|
|
|
|
add ecx, ebp /* nbytes = dist - nbytes */
|
|
cmp dword ptr [esp+52], 0
|
|
jne L_wrap_around_window /* if (write != 0) */
|
|
|
|
sub eax, ecx
|
|
add esi, eax /* from += wsize - nbytes */
|
|
|
|
mov eax, [esp+64] /* eax = len */
|
|
cmp eax, ecx
|
|
jbe L_do_copy /* if (nbytes >= len) */
|
|
|
|
sub eax, ecx /* len -= nbytes */
|
|
rep movsb
|
|
mov esi, edi
|
|
sub esi, ebp /* from = out - dist */
|
|
jmp L_do_copy
|
|
|
|
ALIGN 4
|
|
L_wrap_around_window:
|
|
mov eax, [esp+52] /* eax = write */
|
|
cmp ecx, eax
|
|
jbe L_contiguous_in_window /* if (write >= nbytes) */
|
|
|
|
add esi, [esp+48] /* from += wsize */
|
|
add esi, eax /* from += write */
|
|
sub esi, ecx /* from -= nbytes */
|
|
sub ecx, eax /* nbytes -= write */
|
|
|
|
mov eax, [esp+64] /* eax = len */
|
|
cmp eax, ecx
|
|
jbe L_do_copy /* if (nbytes >= len) */
|
|
|
|
sub eax, ecx /* len -= nbytes */
|
|
rep movsb
|
|
mov esi, [esp+28] /* from = window */
|
|
mov ecx, [esp+52] /* nbytes = write */
|
|
cmp eax, ecx
|
|
jbe L_do_copy /* if (nbytes >= len) */
|
|
|
|
sub eax, ecx /* len -= nbytes */
|
|
rep movsb
|
|
mov esi, edi
|
|
sub esi, ebp /* from = out - dist */
|
|
jmp L_do_copy
|
|
|
|
ALIGN 4
|
|
L_contiguous_in_window:
|
|
add esi, eax
|
|
sub esi, ecx /* from += write - nbytes */
|
|
|
|
mov eax, [esp+64] /* eax = len */
|
|
cmp eax, ecx
|
|
jbe L_do_copy /* if (nbytes >= len) */
|
|
|
|
sub eax, ecx /* len -= nbytes */
|
|
rep movsb
|
|
mov esi, edi
|
|
sub esi, ebp /* from = out - dist */
|
|
jmp L_do_copy
|
|
|
|
ALIGN 4
|
|
L_do_copy:
|
|
mov ecx, eax
|
|
rep movsb
|
|
|
|
mov esi, [esp+8] /* move in back to %esi, toss from */
|
|
mov ebp, [esp+32] /* ebp = lcode */
|
|
jmp L_while_test
|
|
|
|
L_test_for_end_of_block:
|
|
test al, 32
|
|
jz L_invalid_literal_length_code
|
|
mov dword ptr [esp+72], 1
|
|
jmp L_break_loop_with_status
|
|
|
|
L_invalid_literal_length_code:
|
|
mov dword ptr [esp+72], 2
|
|
jmp L_break_loop_with_status
|
|
|
|
L_invalid_distance_code:
|
|
mov dword ptr [esp+72], 3
|
|
jmp L_break_loop_with_status
|
|
|
|
L_invalid_distance_too_far:
|
|
mov esi, [esp+4]
|
|
mov dword ptr [esp+72], 4
|
|
jmp L_break_loop_with_status
|
|
|
|
L_break_loop:
|
|
mov dword ptr [esp+72], 0
|
|
|
|
L_break_loop_with_status:
|
|
/* put in, out, bits, and hold back into ar and pop esp */
|
|
mov [esp+8], esi /* save in */
|
|
mov [esp+16], edi /* save out */
|
|
mov [esp+44], ebx /* save bits */
|
|
mov [esp+40], edx /* save hold */
|
|
mov ebp, [esp+4] /* restore esp, ebp */
|
|
mov esp, [esp]
|
|
}
|
|
#else
|
|
#error "x86 architecture not defined"
|
|
#endif
|
|
|
|
if (ar.status > 1) {
|
|
if (ar.status == 2)
|
|
strm->msg = "invalid literal/length code";
|
|
else if (ar.status == 3)
|
|
strm->msg = "invalid distance code";
|
|
else
|
|
strm->msg = "invalid distance too far back";
|
|
state->mode = BAD;
|
|
}
|
|
else if ( ar.status == 1 ) {
|
|
state->mode = TYPE;
|
|
}
|
|
|
|
/* return unused bytes (on entry, bits < 8, so in won't go too far back) */
|
|
ar.len = ar.bits >> 3;
|
|
ar.in -= ar.len;
|
|
ar.bits -= ar.len << 3;
|
|
ar.hold &= (1U << ar.bits) - 1;
|
|
|
|
/* update state and return */
|
|
strm->next_in = ar.in;
|
|
strm->next_out = ar.out;
|
|
strm->avail_in = (unsigned)(ar.in < ar.last ?
|
|
PAD_AVAIL_IN + (ar.last - ar.in) :
|
|
PAD_AVAIL_IN - (ar.in - ar.last));
|
|
strm->avail_out = (unsigned)(ar.out < ar.end ?
|
|
PAD_AVAIL_OUT + (ar.end - ar.out) :
|
|
PAD_AVAIL_OUT - (ar.out - ar.end));
|
|
state->hold = ar.hold;
|
|
state->bits = ar.bits;
|
|
return;
|
|
}
|
|
|