cannam@89: /* inffas86.c is a hand tuned assembler version of cannam@89: * cannam@89: * inffast.c -- fast decoding cannam@89: * Copyright (C) 1995-2003 Mark Adler cannam@89: * For conditions of distribution and use, see copyright notice in zlib.h cannam@89: * cannam@89: * Copyright (C) 2003 Chris Anderson cannam@89: * Please use the copyright conditions above. cannam@89: * cannam@89: * Dec-29-2003 -- I added AMD64 inflate asm support. This version is also cannam@89: * slightly quicker on x86 systems because, instead of using rep movsb to copy cannam@89: * data, it uses rep movsw, which moves data in 2-byte chunks instead of single cannam@89: * bytes. I've tested the AMD64 code on a Fedora Core 1 + the x86_64 updates cannam@89: * from http://fedora.linux.duke.edu/fc1_x86_64 cannam@89: * which is running on an Athlon 64 3000+ / Gigabyte GA-K8VT800M system with cannam@89: * 1GB ram. The 64-bit version is about 4% faster than the 32-bit version, cannam@89: * when decompressing mozilla-source-1.3.tar.gz. cannam@89: * cannam@89: * Mar-13-2003 -- Most of this is derived from inffast.S which is derived from cannam@89: * the gcc -S output of zlib-1.2.0/inffast.c. Zlib-1.2.0 is in beta release at cannam@89: * the moment. I have successfully compiled and tested this code with gcc2.96, cannam@89: * gcc3.2, icc5.0, msvc6.0. It is very close to the speed of inffast.S cannam@89: * compiled with gcc -DNO_MMX, but inffast.S is still faster on the P3 with MMX cannam@89: * enabled. I will attempt to merge the MMX code into this version. Newer cannam@89: * versions of this and inffast.S can be found at cannam@89: * http://www.eetbeetee.com/zlib/ and http://www.charm.net/~christop/zlib/ cannam@89: */ cannam@89: cannam@89: #include "zutil.h" cannam@89: #include "inftrees.h" cannam@89: #include "inflate.h" cannam@89: #include "inffast.h" cannam@89: cannam@89: /* Mark Adler's comments from inffast.c: */ cannam@89: cannam@89: /* cannam@89: Decode literal, length, and distance codes and write out the resulting cannam@89: literal and match bytes until either not enough input or output is cannam@89: available, an end-of-block is encountered, or a data error is encountered. cannam@89: When large enough input and output buffers are supplied to inflate(), for cannam@89: example, a 16K input buffer and a 64K output buffer, more than 95% of the cannam@89: inflate execution time is spent in this routine. cannam@89: cannam@89: Entry assumptions: cannam@89: cannam@89: state->mode == LEN cannam@89: strm->avail_in >= 6 cannam@89: strm->avail_out >= 258 cannam@89: start >= strm->avail_out cannam@89: state->bits < 8 cannam@89: cannam@89: On return, state->mode is one of: cannam@89: cannam@89: LEN -- ran out of enough output space or enough available input cannam@89: TYPE -- reached end of block code, inflate() to interpret next block cannam@89: BAD -- error in block data cannam@89: cannam@89: Notes: cannam@89: cannam@89: - The maximum input bits used by a length/distance pair is 15 bits for the cannam@89: length code, 5 bits for the length extra, 15 bits for the distance code, cannam@89: and 13 bits for the distance extra. This totals 48 bits, or six bytes. cannam@89: Therefore if strm->avail_in >= 6, then there is enough input to avoid cannam@89: checking for available input while decoding. cannam@89: cannam@89: - The maximum bytes that a single length/distance pair can output is 258 cannam@89: bytes, which is the maximum length that can be coded. inflate_fast() cannam@89: requires strm->avail_out >= 258 for each loop to avoid checking for cannam@89: output space. cannam@89: */ cannam@89: void inflate_fast(strm, start) cannam@89: z_streamp strm; cannam@89: unsigned start; /* inflate()'s starting value for strm->avail_out */ cannam@89: { cannam@89: struct inflate_state FAR *state; cannam@89: struct inffast_ar { cannam@89: /* 64 32 x86 x86_64 */ cannam@89: /* ar offset register */ cannam@89: /* 0 0 */ void *esp; /* esp save */ cannam@89: /* 8 4 */ void *ebp; /* ebp save */ cannam@89: /* 16 8 */ unsigned char FAR *in; /* esi rsi local strm->next_in */ cannam@89: /* 24 12 */ unsigned char FAR *last; /* r9 while in < last */ cannam@89: /* 32 16 */ unsigned char FAR *out; /* edi rdi local strm->next_out */ cannam@89: /* 40 20 */ unsigned char FAR *beg; /* inflate()'s init next_out */ cannam@89: /* 48 24 */ unsigned char FAR *end; /* r10 while out < end */ cannam@89: /* 56 28 */ unsigned char FAR *window;/* size of window, wsize!=0 */ cannam@89: /* 64 32 */ code const FAR *lcode; /* ebp rbp local strm->lencode */ cannam@89: /* 72 36 */ code const FAR *dcode; /* r11 local strm->distcode */ cannam@89: /* 80 40 */ unsigned long hold; /* edx rdx local strm->hold */ cannam@89: /* 88 44 */ unsigned bits; /* ebx rbx local strm->bits */ cannam@89: /* 92 48 */ unsigned wsize; /* window size */ cannam@89: /* 96 52 */ unsigned write; /* window write index */ cannam@89: /*100 56 */ unsigned lmask; /* r12 mask for lcode */ cannam@89: /*104 60 */ unsigned dmask; /* r13 mask for dcode */ cannam@89: /*108 64 */ unsigned len; /* r14 match length */ cannam@89: /*112 68 */ unsigned dist; /* r15 match distance */ cannam@89: /*116 72 */ unsigned status; /* set when state chng*/ cannam@89: } ar; cannam@89: cannam@89: #if defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 ) cannam@89: #define PAD_AVAIL_IN 6 cannam@89: #define PAD_AVAIL_OUT 258 cannam@89: #else cannam@89: #define PAD_AVAIL_IN 5 cannam@89: #define PAD_AVAIL_OUT 257 cannam@89: #endif cannam@89: cannam@89: /* copy state to local variables */ cannam@89: state = (struct inflate_state FAR *)strm->state; cannam@89: ar.in = strm->next_in; cannam@89: ar.last = ar.in + (strm->avail_in - PAD_AVAIL_IN); cannam@89: ar.out = strm->next_out; cannam@89: ar.beg = ar.out - (start - strm->avail_out); cannam@89: ar.end = ar.out + (strm->avail_out - PAD_AVAIL_OUT); cannam@89: ar.wsize = state->wsize; cannam@89: ar.write = state->wnext; cannam@89: ar.window = state->window; cannam@89: ar.hold = state->hold; cannam@89: ar.bits = state->bits; cannam@89: ar.lcode = state->lencode; cannam@89: ar.dcode = state->distcode; cannam@89: ar.lmask = (1U << state->lenbits) - 1; cannam@89: ar.dmask = (1U << state->distbits) - 1; cannam@89: cannam@89: /* decode literals and length/distances until end-of-block or not enough cannam@89: input data or output space */ cannam@89: cannam@89: /* align in on 1/2 hold size boundary */ cannam@89: while (((unsigned long)(void *)ar.in & (sizeof(ar.hold) / 2 - 1)) != 0) { cannam@89: ar.hold += (unsigned long)*ar.in++ << ar.bits; cannam@89: ar.bits += 8; cannam@89: } cannam@89: cannam@89: #if defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 ) cannam@89: __asm__ __volatile__ ( cannam@89: " leaq %0, %%rax\n" cannam@89: " movq %%rbp, 8(%%rax)\n" /* save regs rbp and rsp */ cannam@89: " movq %%rsp, (%%rax)\n" cannam@89: " movq %%rax, %%rsp\n" /* make rsp point to &ar */ cannam@89: " movq 16(%%rsp), %%rsi\n" /* rsi = in */ cannam@89: " movq 32(%%rsp), %%rdi\n" /* rdi = out */ cannam@89: " movq 24(%%rsp), %%r9\n" /* r9 = last */ cannam@89: " movq 48(%%rsp), %%r10\n" /* r10 = end */ cannam@89: " movq 64(%%rsp), %%rbp\n" /* rbp = lcode */ cannam@89: " movq 72(%%rsp), %%r11\n" /* r11 = dcode */ cannam@89: " movq 80(%%rsp), %%rdx\n" /* rdx = hold */ cannam@89: " movl 88(%%rsp), %%ebx\n" /* ebx = bits */ cannam@89: " movl 100(%%rsp), %%r12d\n" /* r12d = lmask */ cannam@89: " movl 104(%%rsp), %%r13d\n" /* r13d = dmask */ cannam@89: /* r14d = len */ cannam@89: /* r15d = dist */ cannam@89: " cld\n" cannam@89: " cmpq %%rdi, %%r10\n" cannam@89: " je .L_one_time\n" /* if only one decode left */ cannam@89: " cmpq %%rsi, %%r9\n" cannam@89: " je .L_one_time\n" cannam@89: " jmp .L_do_loop\n" cannam@89: cannam@89: ".L_one_time:\n" cannam@89: " movq %%r12, %%r8\n" /* r8 = lmask */ cannam@89: " cmpb $32, %%bl\n" cannam@89: " ja .L_get_length_code_one_time\n" cannam@89: cannam@89: " lodsl\n" /* eax = *(uint *)in++ */ cannam@89: " movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */ cannam@89: " addb $32, %%bl\n" /* bits += 32 */ cannam@89: " shlq %%cl, %%rax\n" cannam@89: " orq %%rax, %%rdx\n" /* hold |= *((uint *)in)++ << bits */ cannam@89: " jmp .L_get_length_code_one_time\n" cannam@89: cannam@89: ".align 32,0x90\n" cannam@89: ".L_while_test:\n" cannam@89: " cmpq %%rdi, %%r10\n" cannam@89: " jbe .L_break_loop\n" cannam@89: " cmpq %%rsi, %%r9\n" cannam@89: " jbe .L_break_loop\n" cannam@89: cannam@89: ".L_do_loop:\n" cannam@89: " movq %%r12, %%r8\n" /* r8 = lmask */ cannam@89: " cmpb $32, %%bl\n" cannam@89: " ja .L_get_length_code\n" /* if (32 < bits) */ cannam@89: cannam@89: " lodsl\n" /* eax = *(uint *)in++ */ cannam@89: " movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */ cannam@89: " addb $32, %%bl\n" /* bits += 32 */ cannam@89: " shlq %%cl, %%rax\n" cannam@89: " orq %%rax, %%rdx\n" /* hold |= *((uint *)in)++ << bits */ cannam@89: cannam@89: ".L_get_length_code:\n" cannam@89: " andq %%rdx, %%r8\n" /* r8 &= hold */ cannam@89: " movl (%%rbp,%%r8,4), %%eax\n" /* eax = lcode[hold & lmask] */ cannam@89: cannam@89: " movb %%ah, %%cl\n" /* cl = this.bits */ cannam@89: " subb %%ah, %%bl\n" /* bits -= this.bits */ cannam@89: " shrq %%cl, %%rdx\n" /* hold >>= this.bits */ cannam@89: cannam@89: " testb %%al, %%al\n" cannam@89: " jnz .L_test_for_length_base\n" /* if (op != 0) 45.7% */ cannam@89: cannam@89: " movq %%r12, %%r8\n" /* r8 = lmask */ cannam@89: " shrl $16, %%eax\n" /* output this.val char */ cannam@89: " stosb\n" cannam@89: cannam@89: ".L_get_length_code_one_time:\n" cannam@89: " andq %%rdx, %%r8\n" /* r8 &= hold */ cannam@89: " movl (%%rbp,%%r8,4), %%eax\n" /* eax = lcode[hold & lmask] */ cannam@89: cannam@89: ".L_dolen:\n" cannam@89: " movb %%ah, %%cl\n" /* cl = this.bits */ cannam@89: " subb %%ah, %%bl\n" /* bits -= this.bits */ cannam@89: " shrq %%cl, %%rdx\n" /* hold >>= this.bits */ cannam@89: cannam@89: " testb %%al, %%al\n" cannam@89: " jnz .L_test_for_length_base\n" /* if (op != 0) 45.7% */ cannam@89: cannam@89: " shrl $16, %%eax\n" /* output this.val char */ cannam@89: " stosb\n" cannam@89: " jmp .L_while_test\n" cannam@89: cannam@89: ".align 32,0x90\n" cannam@89: ".L_test_for_length_base:\n" cannam@89: " movl %%eax, %%r14d\n" /* len = this */ cannam@89: " shrl $16, %%r14d\n" /* len = this.val */ cannam@89: " movb %%al, %%cl\n" cannam@89: cannam@89: " testb $16, %%al\n" cannam@89: " jz .L_test_for_second_level_length\n" /* if ((op & 16) == 0) 8% */ cannam@89: " andb $15, %%cl\n" /* op &= 15 */ cannam@89: " jz .L_decode_distance\n" /* if (!op) */ cannam@89: cannam@89: ".L_add_bits_to_len:\n" cannam@89: " subb %%cl, %%bl\n" cannam@89: " xorl %%eax, %%eax\n" cannam@89: " incl %%eax\n" cannam@89: " shll %%cl, %%eax\n" cannam@89: " decl %%eax\n" cannam@89: " andl %%edx, %%eax\n" /* eax &= hold */ cannam@89: " shrq %%cl, %%rdx\n" cannam@89: " addl %%eax, %%r14d\n" /* len += hold & mask[op] */ cannam@89: cannam@89: ".L_decode_distance:\n" cannam@89: " movq %%r13, %%r8\n" /* r8 = dmask */ cannam@89: " cmpb $32, %%bl\n" cannam@89: " ja .L_get_distance_code\n" /* if (32 < bits) */ cannam@89: cannam@89: " lodsl\n" /* eax = *(uint *)in++ */ cannam@89: " movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */ cannam@89: " addb $32, %%bl\n" /* bits += 32 */ cannam@89: " shlq %%cl, %%rax\n" cannam@89: " orq %%rax, %%rdx\n" /* hold |= *((uint *)in)++ << bits */ cannam@89: cannam@89: ".L_get_distance_code:\n" cannam@89: " andq %%rdx, %%r8\n" /* r8 &= hold */ cannam@89: " movl (%%r11,%%r8,4), %%eax\n" /* eax = dcode[hold & dmask] */ cannam@89: cannam@89: ".L_dodist:\n" cannam@89: " movl %%eax, %%r15d\n" /* dist = this */ cannam@89: " shrl $16, %%r15d\n" /* dist = this.val */ cannam@89: " movb %%ah, %%cl\n" cannam@89: " subb %%ah, %%bl\n" /* bits -= this.bits */ cannam@89: " shrq %%cl, %%rdx\n" /* hold >>= this.bits */ cannam@89: " movb %%al, %%cl\n" /* cl = this.op */ cannam@89: cannam@89: " testb $16, %%al\n" /* if ((op & 16) == 0) */ cannam@89: " jz .L_test_for_second_level_dist\n" cannam@89: " andb $15, %%cl\n" /* op &= 15 */ cannam@89: " jz .L_check_dist_one\n" cannam@89: cannam@89: ".L_add_bits_to_dist:\n" cannam@89: " subb %%cl, %%bl\n" cannam@89: " xorl %%eax, %%eax\n" cannam@89: " incl %%eax\n" cannam@89: " shll %%cl, %%eax\n" cannam@89: " decl %%eax\n" /* (1 << op) - 1 */ cannam@89: " andl %%edx, %%eax\n" /* eax &= hold */ cannam@89: " shrq %%cl, %%rdx\n" cannam@89: " addl %%eax, %%r15d\n" /* dist += hold & ((1 << op) - 1) */ cannam@89: cannam@89: ".L_check_window:\n" cannam@89: " movq %%rsi, %%r8\n" /* save in so from can use it's reg */ cannam@89: " movq %%rdi, %%rax\n" cannam@89: " subq 40(%%rsp), %%rax\n" /* nbytes = out - beg */ cannam@89: cannam@89: " cmpl %%r15d, %%eax\n" cannam@89: " jb .L_clip_window\n" /* if (dist > nbytes) 4.2% */ cannam@89: cannam@89: " movl %%r14d, %%ecx\n" /* ecx = len */ cannam@89: " movq %%rdi, %%rsi\n" cannam@89: " subq %%r15, %%rsi\n" /* from = out - dist */ cannam@89: cannam@89: " sarl %%ecx\n" cannam@89: " jnc .L_copy_two\n" /* if len % 2 == 0 */ cannam@89: cannam@89: " rep movsw\n" cannam@89: " movb (%%rsi), %%al\n" cannam@89: " movb %%al, (%%rdi)\n" cannam@89: " incq %%rdi\n" cannam@89: cannam@89: " movq %%r8, %%rsi\n" /* move in back to %rsi, toss from */ cannam@89: " jmp .L_while_test\n" cannam@89: cannam@89: ".L_copy_two:\n" cannam@89: " rep movsw\n" cannam@89: " movq %%r8, %%rsi\n" /* move in back to %rsi, toss from */ cannam@89: " jmp .L_while_test\n" cannam@89: cannam@89: ".align 32,0x90\n" cannam@89: ".L_check_dist_one:\n" cannam@89: " cmpl $1, %%r15d\n" /* if dist 1, is a memset */ cannam@89: " jne .L_check_window\n" cannam@89: " cmpq %%rdi, 40(%%rsp)\n" /* if out == beg, outside window */ cannam@89: " je .L_check_window\n" cannam@89: cannam@89: " movl %%r14d, %%ecx\n" /* ecx = len */ cannam@89: " movb -1(%%rdi), %%al\n" cannam@89: " movb %%al, %%ah\n" cannam@89: cannam@89: " sarl %%ecx\n" cannam@89: " jnc .L_set_two\n" cannam@89: " movb %%al, (%%rdi)\n" cannam@89: " incq %%rdi\n" cannam@89: cannam@89: ".L_set_two:\n" cannam@89: " rep stosw\n" cannam@89: " jmp .L_while_test\n" cannam@89: cannam@89: ".align 32,0x90\n" cannam@89: ".L_test_for_second_level_length:\n" cannam@89: " testb $64, %%al\n" cannam@89: " jnz .L_test_for_end_of_block\n" /* if ((op & 64) != 0) */ cannam@89: cannam@89: " xorl %%eax, %%eax\n" cannam@89: " incl %%eax\n" cannam@89: " shll %%cl, %%eax\n" cannam@89: " decl %%eax\n" cannam@89: " andl %%edx, %%eax\n" /* eax &= hold */ cannam@89: " addl %%r14d, %%eax\n" /* eax += len */ cannam@89: " movl (%%rbp,%%rax,4), %%eax\n" /* eax = lcode[val+(hold&mask[op])]*/ cannam@89: " jmp .L_dolen\n" cannam@89: cannam@89: ".align 32,0x90\n" cannam@89: ".L_test_for_second_level_dist:\n" cannam@89: " testb $64, %%al\n" cannam@89: " jnz .L_invalid_distance_code\n" /* if ((op & 64) != 0) */ cannam@89: cannam@89: " xorl %%eax, %%eax\n" cannam@89: " incl %%eax\n" cannam@89: " shll %%cl, %%eax\n" cannam@89: " decl %%eax\n" cannam@89: " andl %%edx, %%eax\n" /* eax &= hold */ cannam@89: " addl %%r15d, %%eax\n" /* eax += dist */ cannam@89: " movl (%%r11,%%rax,4), %%eax\n" /* eax = dcode[val+(hold&mask[op])]*/ cannam@89: " jmp .L_dodist\n" cannam@89: cannam@89: ".align 32,0x90\n" cannam@89: ".L_clip_window:\n" cannam@89: " movl %%eax, %%ecx\n" /* ecx = nbytes */ cannam@89: " movl 92(%%rsp), %%eax\n" /* eax = wsize, prepare for dist cmp */ cannam@89: " negl %%ecx\n" /* nbytes = -nbytes */ cannam@89: cannam@89: " cmpl %%r15d, %%eax\n" cannam@89: " jb .L_invalid_distance_too_far\n" /* if (dist > wsize) */ cannam@89: cannam@89: " addl %%r15d, %%ecx\n" /* nbytes = dist - nbytes */ cannam@89: " cmpl $0, 96(%%rsp)\n" cannam@89: " jne .L_wrap_around_window\n" /* if (write != 0) */ cannam@89: cannam@89: " movq 56(%%rsp), %%rsi\n" /* from = window */ cannam@89: " subl %%ecx, %%eax\n" /* eax -= nbytes */ cannam@89: " addq %%rax, %%rsi\n" /* from += wsize - nbytes */ cannam@89: cannam@89: " movl %%r14d, %%eax\n" /* eax = len */ cannam@89: " cmpl %%ecx, %%r14d\n" cannam@89: " jbe .L_do_copy\n" /* if (nbytes >= len) */ cannam@89: cannam@89: " subl %%ecx, %%eax\n" /* eax -= nbytes */ cannam@89: " rep movsb\n" cannam@89: " movq %%rdi, %%rsi\n" cannam@89: " subq %%r15, %%rsi\n" /* from = &out[ -dist ] */ cannam@89: " jmp .L_do_copy\n" cannam@89: cannam@89: ".align 32,0x90\n" cannam@89: ".L_wrap_around_window:\n" cannam@89: " movl 96(%%rsp), %%eax\n" /* eax = write */ cannam@89: " cmpl %%eax, %%ecx\n" cannam@89: " jbe .L_contiguous_in_window\n" /* if (write >= nbytes) */ cannam@89: cannam@89: " movl 92(%%rsp), %%esi\n" /* from = wsize */ cannam@89: " addq 56(%%rsp), %%rsi\n" /* from += window */ cannam@89: " addq %%rax, %%rsi\n" /* from += write */ cannam@89: " subq %%rcx, %%rsi\n" /* from -= nbytes */ cannam@89: " subl %%eax, %%ecx\n" /* nbytes -= write */ cannam@89: cannam@89: " movl %%r14d, %%eax\n" /* eax = len */ cannam@89: " cmpl %%ecx, %%eax\n" cannam@89: " jbe .L_do_copy\n" /* if (nbytes >= len) */ cannam@89: cannam@89: " subl %%ecx, %%eax\n" /* len -= nbytes */ cannam@89: " rep movsb\n" cannam@89: " movq 56(%%rsp), %%rsi\n" /* from = window */ cannam@89: " movl 96(%%rsp), %%ecx\n" /* nbytes = write */ cannam@89: " cmpl %%ecx, %%eax\n" cannam@89: " jbe .L_do_copy\n" /* if (nbytes >= len) */ cannam@89: cannam@89: " subl %%ecx, %%eax\n" /* len -= nbytes */ cannam@89: " rep movsb\n" cannam@89: " movq %%rdi, %%rsi\n" cannam@89: " subq %%r15, %%rsi\n" /* from = out - dist */ cannam@89: " jmp .L_do_copy\n" cannam@89: cannam@89: ".align 32,0x90\n" cannam@89: ".L_contiguous_in_window:\n" cannam@89: " movq 56(%%rsp), %%rsi\n" /* rsi = window */ cannam@89: " addq %%rax, %%rsi\n" cannam@89: " subq %%rcx, %%rsi\n" /* from += write - nbytes */ cannam@89: cannam@89: " movl %%r14d, %%eax\n" /* eax = len */ cannam@89: " cmpl %%ecx, %%eax\n" cannam@89: " jbe .L_do_copy\n" /* if (nbytes >= len) */ cannam@89: cannam@89: " subl %%ecx, %%eax\n" /* len -= nbytes */ cannam@89: " rep movsb\n" cannam@89: " movq %%rdi, %%rsi\n" cannam@89: " subq %%r15, %%rsi\n" /* from = out - dist */ cannam@89: " jmp .L_do_copy\n" /* if (nbytes >= len) */ cannam@89: cannam@89: ".align 32,0x90\n" cannam@89: ".L_do_copy:\n" cannam@89: " movl %%eax, %%ecx\n" /* ecx = len */ cannam@89: " rep movsb\n" cannam@89: cannam@89: " movq %%r8, %%rsi\n" /* move in back to %esi, toss from */ cannam@89: " jmp .L_while_test\n" cannam@89: cannam@89: ".L_test_for_end_of_block:\n" cannam@89: " testb $32, %%al\n" cannam@89: " jz .L_invalid_literal_length_code\n" cannam@89: " movl $1, 116(%%rsp)\n" cannam@89: " jmp .L_break_loop_with_status\n" cannam@89: cannam@89: ".L_invalid_literal_length_code:\n" cannam@89: " movl $2, 116(%%rsp)\n" cannam@89: " jmp .L_break_loop_with_status\n" cannam@89: cannam@89: ".L_invalid_distance_code:\n" cannam@89: " movl $3, 116(%%rsp)\n" cannam@89: " jmp .L_break_loop_with_status\n" cannam@89: cannam@89: ".L_invalid_distance_too_far:\n" cannam@89: " movl $4, 116(%%rsp)\n" cannam@89: " jmp .L_break_loop_with_status\n" cannam@89: cannam@89: ".L_break_loop:\n" cannam@89: " movl $0, 116(%%rsp)\n" cannam@89: cannam@89: ".L_break_loop_with_status:\n" cannam@89: /* put in, out, bits, and hold back into ar and pop esp */ cannam@89: " movq %%rsi, 16(%%rsp)\n" /* in */ cannam@89: " movq %%rdi, 32(%%rsp)\n" /* out */ cannam@89: " movl %%ebx, 88(%%rsp)\n" /* bits */ cannam@89: " movq %%rdx, 80(%%rsp)\n" /* hold */ cannam@89: " movq (%%rsp), %%rax\n" /* restore rbp and rsp */ cannam@89: " movq 8(%%rsp), %%rbp\n" cannam@89: " movq %%rax, %%rsp\n" cannam@89: : cannam@89: : "m" (ar) cannam@89: : "memory", "%rax", "%rbx", "%rcx", "%rdx", "%rsi", "%rdi", cannam@89: "%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15" cannam@89: ); cannam@89: #elif ( defined( __GNUC__ ) || defined( __ICC ) ) && defined( __i386 ) cannam@89: __asm__ __volatile__ ( cannam@89: " leal %0, %%eax\n" cannam@89: " movl %%esp, (%%eax)\n" /* save esp, ebp */ cannam@89: " movl %%ebp, 4(%%eax)\n" cannam@89: " movl %%eax, %%esp\n" cannam@89: " movl 8(%%esp), %%esi\n" /* esi = in */ cannam@89: " movl 16(%%esp), %%edi\n" /* edi = out */ cannam@89: " movl 40(%%esp), %%edx\n" /* edx = hold */ cannam@89: " movl 44(%%esp), %%ebx\n" /* ebx = bits */ cannam@89: " movl 32(%%esp), %%ebp\n" /* ebp = lcode */ cannam@89: cannam@89: " cld\n" cannam@89: " jmp .L_do_loop\n" cannam@89: cannam@89: ".align 32,0x90\n" cannam@89: ".L_while_test:\n" cannam@89: " cmpl %%edi, 24(%%esp)\n" /* out < end */ cannam@89: " jbe .L_break_loop\n" cannam@89: " cmpl %%esi, 12(%%esp)\n" /* in < last */ cannam@89: " jbe .L_break_loop\n" cannam@89: cannam@89: ".L_do_loop:\n" cannam@89: " cmpb $15, %%bl\n" cannam@89: " ja .L_get_length_code\n" /* if (15 < bits) */ cannam@89: cannam@89: " xorl %%eax, %%eax\n" cannam@89: " lodsw\n" /* al = *(ushort *)in++ */ cannam@89: " movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */ cannam@89: " addb $16, %%bl\n" /* bits += 16 */ cannam@89: " shll %%cl, %%eax\n" cannam@89: " orl %%eax, %%edx\n" /* hold |= *((ushort *)in)++ << bits */ cannam@89: cannam@89: ".L_get_length_code:\n" cannam@89: " movl 56(%%esp), %%eax\n" /* eax = lmask */ cannam@89: " andl %%edx, %%eax\n" /* eax &= hold */ cannam@89: " movl (%%ebp,%%eax,4), %%eax\n" /* eax = lcode[hold & lmask] */ cannam@89: cannam@89: ".L_dolen:\n" cannam@89: " movb %%ah, %%cl\n" /* cl = this.bits */ cannam@89: " subb %%ah, %%bl\n" /* bits -= this.bits */ cannam@89: " shrl %%cl, %%edx\n" /* hold >>= this.bits */ cannam@89: cannam@89: " testb %%al, %%al\n" cannam@89: " jnz .L_test_for_length_base\n" /* if (op != 0) 45.7% */ cannam@89: cannam@89: " shrl $16, %%eax\n" /* output this.val char */ cannam@89: " stosb\n" cannam@89: " jmp .L_while_test\n" cannam@89: cannam@89: ".align 32,0x90\n" cannam@89: ".L_test_for_length_base:\n" cannam@89: " movl %%eax, %%ecx\n" /* len = this */ cannam@89: " shrl $16, %%ecx\n" /* len = this.val */ cannam@89: " movl %%ecx, 64(%%esp)\n" /* save len */ cannam@89: " movb %%al, %%cl\n" cannam@89: cannam@89: " testb $16, %%al\n" cannam@89: " jz .L_test_for_second_level_length\n" /* if ((op & 16) == 0) 8% */ cannam@89: " andb $15, %%cl\n" /* op &= 15 */ cannam@89: " jz .L_decode_distance\n" /* if (!op) */ cannam@89: " cmpb %%cl, %%bl\n" cannam@89: " jae .L_add_bits_to_len\n" /* if (op <= bits) */ cannam@89: cannam@89: " movb %%cl, %%ch\n" /* stash op in ch, freeing cl */ cannam@89: " xorl %%eax, %%eax\n" cannam@89: " lodsw\n" /* al = *(ushort *)in++ */ cannam@89: " movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */ cannam@89: " addb $16, %%bl\n" /* bits += 16 */ cannam@89: " shll %%cl, %%eax\n" cannam@89: " orl %%eax, %%edx\n" /* hold |= *((ushort *)in)++ << bits */ cannam@89: " movb %%ch, %%cl\n" /* move op back to ecx */ cannam@89: cannam@89: ".L_add_bits_to_len:\n" cannam@89: " subb %%cl, %%bl\n" cannam@89: " xorl %%eax, %%eax\n" cannam@89: " incl %%eax\n" cannam@89: " shll %%cl, %%eax\n" cannam@89: " decl %%eax\n" cannam@89: " andl %%edx, %%eax\n" /* eax &= hold */ cannam@89: " shrl %%cl, %%edx\n" cannam@89: " addl %%eax, 64(%%esp)\n" /* len += hold & mask[op] */ cannam@89: cannam@89: ".L_decode_distance:\n" cannam@89: " cmpb $15, %%bl\n" cannam@89: " ja .L_get_distance_code\n" /* if (15 < bits) */ cannam@89: cannam@89: " xorl %%eax, %%eax\n" cannam@89: " lodsw\n" /* al = *(ushort *)in++ */ cannam@89: " movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */ cannam@89: " addb $16, %%bl\n" /* bits += 16 */ cannam@89: " shll %%cl, %%eax\n" cannam@89: " orl %%eax, %%edx\n" /* hold |= *((ushort *)in)++ << bits */ cannam@89: cannam@89: ".L_get_distance_code:\n" cannam@89: " movl 60(%%esp), %%eax\n" /* eax = dmask */ cannam@89: " movl 36(%%esp), %%ecx\n" /* ecx = dcode */ cannam@89: " andl %%edx, %%eax\n" /* eax &= hold */ cannam@89: " movl (%%ecx,%%eax,4), %%eax\n"/* eax = dcode[hold & dmask] */ cannam@89: cannam@89: ".L_dodist:\n" cannam@89: " movl %%eax, %%ebp\n" /* dist = this */ cannam@89: " shrl $16, %%ebp\n" /* dist = this.val */ cannam@89: " movb %%ah, %%cl\n" cannam@89: " subb %%ah, %%bl\n" /* bits -= this.bits */ cannam@89: " shrl %%cl, %%edx\n" /* hold >>= this.bits */ cannam@89: " movb %%al, %%cl\n" /* cl = this.op */ cannam@89: cannam@89: " testb $16, %%al\n" /* if ((op & 16) == 0) */ cannam@89: " jz .L_test_for_second_level_dist\n" cannam@89: " andb $15, %%cl\n" /* op &= 15 */ cannam@89: " jz .L_check_dist_one\n" cannam@89: " cmpb %%cl, %%bl\n" cannam@89: " jae .L_add_bits_to_dist\n" /* if (op <= bits) 97.6% */ cannam@89: cannam@89: " movb %%cl, %%ch\n" /* stash op in ch, freeing cl */ cannam@89: " xorl %%eax, %%eax\n" cannam@89: " lodsw\n" /* al = *(ushort *)in++ */ cannam@89: " movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */ cannam@89: " addb $16, %%bl\n" /* bits += 16 */ cannam@89: " shll %%cl, %%eax\n" cannam@89: " orl %%eax, %%edx\n" /* hold |= *((ushort *)in)++ << bits */ cannam@89: " movb %%ch, %%cl\n" /* move op back to ecx */ cannam@89: cannam@89: ".L_add_bits_to_dist:\n" cannam@89: " subb %%cl, %%bl\n" cannam@89: " xorl %%eax, %%eax\n" cannam@89: " incl %%eax\n" cannam@89: " shll %%cl, %%eax\n" cannam@89: " decl %%eax\n" /* (1 << op) - 1 */ cannam@89: " andl %%edx, %%eax\n" /* eax &= hold */ cannam@89: " shrl %%cl, %%edx\n" cannam@89: " addl %%eax, %%ebp\n" /* dist += hold & ((1 << op) - 1) */ cannam@89: cannam@89: ".L_check_window:\n" cannam@89: " movl %%esi, 8(%%esp)\n" /* save in so from can use it's reg */ cannam@89: " movl %%edi, %%eax\n" cannam@89: " subl 20(%%esp), %%eax\n" /* nbytes = out - beg */ cannam@89: cannam@89: " cmpl %%ebp, %%eax\n" cannam@89: " jb .L_clip_window\n" /* if (dist > nbytes) 4.2% */ cannam@89: cannam@89: " movl 64(%%esp), %%ecx\n" /* ecx = len */ cannam@89: " movl %%edi, %%esi\n" cannam@89: " subl %%ebp, %%esi\n" /* from = out - dist */ cannam@89: cannam@89: " sarl %%ecx\n" cannam@89: " jnc .L_copy_two\n" /* if len % 2 == 0 */ cannam@89: cannam@89: " rep movsw\n" cannam@89: " movb (%%esi), %%al\n" cannam@89: " movb %%al, (%%edi)\n" cannam@89: " incl %%edi\n" cannam@89: cannam@89: " movl 8(%%esp), %%esi\n" /* move in back to %esi, toss from */ cannam@89: " movl 32(%%esp), %%ebp\n" /* ebp = lcode */ cannam@89: " jmp .L_while_test\n" cannam@89: cannam@89: ".L_copy_two:\n" cannam@89: " rep movsw\n" cannam@89: " movl 8(%%esp), %%esi\n" /* move in back to %esi, toss from */ cannam@89: " movl 32(%%esp), %%ebp\n" /* ebp = lcode */ cannam@89: " jmp .L_while_test\n" cannam@89: cannam@89: ".align 32,0x90\n" cannam@89: ".L_check_dist_one:\n" cannam@89: " cmpl $1, %%ebp\n" /* if dist 1, is a memset */ cannam@89: " jne .L_check_window\n" cannam@89: " cmpl %%edi, 20(%%esp)\n" cannam@89: " je .L_check_window\n" /* out == beg, if outside window */ cannam@89: cannam@89: " movl 64(%%esp), %%ecx\n" /* ecx = len */ cannam@89: " movb -1(%%edi), %%al\n" cannam@89: " movb %%al, %%ah\n" cannam@89: cannam@89: " sarl %%ecx\n" cannam@89: " jnc .L_set_two\n" cannam@89: " movb %%al, (%%edi)\n" cannam@89: " incl %%edi\n" cannam@89: cannam@89: ".L_set_two:\n" cannam@89: " rep stosw\n" cannam@89: " movl 32(%%esp), %%ebp\n" /* ebp = lcode */ cannam@89: " jmp .L_while_test\n" cannam@89: cannam@89: ".align 32,0x90\n" cannam@89: ".L_test_for_second_level_length:\n" cannam@89: " testb $64, %%al\n" cannam@89: " jnz .L_test_for_end_of_block\n" /* if ((op & 64) != 0) */ cannam@89: cannam@89: " xorl %%eax, %%eax\n" cannam@89: " incl %%eax\n" cannam@89: " shll %%cl, %%eax\n" cannam@89: " decl %%eax\n" cannam@89: " andl %%edx, %%eax\n" /* eax &= hold */ cannam@89: " addl 64(%%esp), %%eax\n" /* eax += len */ cannam@89: " movl (%%ebp,%%eax,4), %%eax\n" /* eax = lcode[val+(hold&mask[op])]*/ cannam@89: " jmp .L_dolen\n" cannam@89: cannam@89: ".align 32,0x90\n" cannam@89: ".L_test_for_second_level_dist:\n" cannam@89: " testb $64, %%al\n" cannam@89: " jnz .L_invalid_distance_code\n" /* if ((op & 64) != 0) */ cannam@89: cannam@89: " xorl %%eax, %%eax\n" cannam@89: " incl %%eax\n" cannam@89: " shll %%cl, %%eax\n" cannam@89: " decl %%eax\n" cannam@89: " andl %%edx, %%eax\n" /* eax &= hold */ cannam@89: " addl %%ebp, %%eax\n" /* eax += dist */ cannam@89: " movl 36(%%esp), %%ecx\n" /* ecx = dcode */ cannam@89: " movl (%%ecx,%%eax,4), %%eax\n" /* eax = dcode[val+(hold&mask[op])]*/ cannam@89: " jmp .L_dodist\n" cannam@89: cannam@89: ".align 32,0x90\n" cannam@89: ".L_clip_window:\n" cannam@89: " movl %%eax, %%ecx\n" cannam@89: " movl 48(%%esp), %%eax\n" /* eax = wsize */ cannam@89: " negl %%ecx\n" /* nbytes = -nbytes */ cannam@89: " movl 28(%%esp), %%esi\n" /* from = window */ cannam@89: cannam@89: " cmpl %%ebp, %%eax\n" cannam@89: " jb .L_invalid_distance_too_far\n" /* if (dist > wsize) */ cannam@89: cannam@89: " addl %%ebp, %%ecx\n" /* nbytes = dist - nbytes */ cannam@89: " cmpl $0, 52(%%esp)\n" cannam@89: " jne .L_wrap_around_window\n" /* if (write != 0) */ cannam@89: cannam@89: " subl %%ecx, %%eax\n" cannam@89: " addl %%eax, %%esi\n" /* from += wsize - nbytes */ cannam@89: cannam@89: " movl 64(%%esp), %%eax\n" /* eax = len */ cannam@89: " cmpl %%ecx, %%eax\n" cannam@89: " jbe .L_do_copy\n" /* if (nbytes >= len) */ cannam@89: cannam@89: " subl %%ecx, %%eax\n" /* len -= nbytes */ cannam@89: " rep movsb\n" cannam@89: " movl %%edi, %%esi\n" cannam@89: " subl %%ebp, %%esi\n" /* from = out - dist */ cannam@89: " jmp .L_do_copy\n" cannam@89: cannam@89: ".align 32,0x90\n" cannam@89: ".L_wrap_around_window:\n" cannam@89: " movl 52(%%esp), %%eax\n" /* eax = write */ cannam@89: " cmpl %%eax, %%ecx\n" cannam@89: " jbe .L_contiguous_in_window\n" /* if (write >= nbytes) */ cannam@89: cannam@89: " addl 48(%%esp), %%esi\n" /* from += wsize */ cannam@89: " addl %%eax, %%esi\n" /* from += write */ cannam@89: " subl %%ecx, %%esi\n" /* from -= nbytes */ cannam@89: " subl %%eax, %%ecx\n" /* nbytes -= write */ cannam@89: cannam@89: " movl 64(%%esp), %%eax\n" /* eax = len */ cannam@89: " cmpl %%ecx, %%eax\n" cannam@89: " jbe .L_do_copy\n" /* if (nbytes >= len) */ cannam@89: cannam@89: " subl %%ecx, %%eax\n" /* len -= nbytes */ cannam@89: " rep movsb\n" cannam@89: " movl 28(%%esp), %%esi\n" /* from = window */ cannam@89: " movl 52(%%esp), %%ecx\n" /* nbytes = write */ cannam@89: " cmpl %%ecx, %%eax\n" cannam@89: " jbe .L_do_copy\n" /* if (nbytes >= len) */ cannam@89: cannam@89: " subl %%ecx, %%eax\n" /* len -= nbytes */ cannam@89: " rep movsb\n" cannam@89: " movl %%edi, %%esi\n" cannam@89: " subl %%ebp, %%esi\n" /* from = out - dist */ cannam@89: " jmp .L_do_copy\n" cannam@89: cannam@89: ".align 32,0x90\n" cannam@89: ".L_contiguous_in_window:\n" cannam@89: " addl %%eax, %%esi\n" cannam@89: " subl %%ecx, %%esi\n" /* from += write - nbytes */ cannam@89: cannam@89: " movl 64(%%esp), %%eax\n" /* eax = len */ cannam@89: " cmpl %%ecx, %%eax\n" cannam@89: " jbe .L_do_copy\n" /* if (nbytes >= len) */ cannam@89: cannam@89: " subl %%ecx, %%eax\n" /* len -= nbytes */ cannam@89: " rep movsb\n" cannam@89: " movl %%edi, %%esi\n" cannam@89: " subl %%ebp, %%esi\n" /* from = out - dist */ cannam@89: " jmp .L_do_copy\n" /* if (nbytes >= len) */ cannam@89: cannam@89: ".align 32,0x90\n" cannam@89: ".L_do_copy:\n" cannam@89: " movl %%eax, %%ecx\n" cannam@89: " rep movsb\n" cannam@89: cannam@89: " movl 8(%%esp), %%esi\n" /* move in back to %esi, toss from */ cannam@89: " movl 32(%%esp), %%ebp\n" /* ebp = lcode */ cannam@89: " jmp .L_while_test\n" cannam@89: cannam@89: ".L_test_for_end_of_block:\n" cannam@89: " testb $32, %%al\n" cannam@89: " jz .L_invalid_literal_length_code\n" cannam@89: " movl $1, 72(%%esp)\n" cannam@89: " jmp .L_break_loop_with_status\n" cannam@89: cannam@89: ".L_invalid_literal_length_code:\n" cannam@89: " movl $2, 72(%%esp)\n" cannam@89: " jmp .L_break_loop_with_status\n" cannam@89: cannam@89: ".L_invalid_distance_code:\n" cannam@89: " movl $3, 72(%%esp)\n" cannam@89: " jmp .L_break_loop_with_status\n" cannam@89: cannam@89: ".L_invalid_distance_too_far:\n" cannam@89: " movl 8(%%esp), %%esi\n" cannam@89: " movl $4, 72(%%esp)\n" cannam@89: " jmp .L_break_loop_with_status\n" cannam@89: cannam@89: ".L_break_loop:\n" cannam@89: " movl $0, 72(%%esp)\n" cannam@89: cannam@89: ".L_break_loop_with_status:\n" cannam@89: /* put in, out, bits, and hold back into ar and pop esp */ cannam@89: " movl %%esi, 8(%%esp)\n" /* save in */ cannam@89: " movl %%edi, 16(%%esp)\n" /* save out */ cannam@89: " movl %%ebx, 44(%%esp)\n" /* save bits */ cannam@89: " movl %%edx, 40(%%esp)\n" /* save hold */ cannam@89: " movl 4(%%esp), %%ebp\n" /* restore esp, ebp */ cannam@89: " movl (%%esp), %%esp\n" cannam@89: : cannam@89: : "m" (ar) cannam@89: : "memory", "%eax", "%ebx", "%ecx", "%edx", "%esi", "%edi" cannam@89: ); cannam@89: #elif defined( _MSC_VER ) && ! defined( _M_AMD64 ) cannam@89: __asm { cannam@89: lea eax, ar cannam@89: mov [eax], esp /* save esp, ebp */ cannam@89: mov [eax+4], ebp cannam@89: mov esp, eax cannam@89: mov esi, [esp+8] /* esi = in */ cannam@89: mov edi, [esp+16] /* edi = out */ cannam@89: mov edx, [esp+40] /* edx = hold */ cannam@89: mov ebx, [esp+44] /* ebx = bits */ cannam@89: mov ebp, [esp+32] /* ebp = lcode */ cannam@89: cannam@89: cld cannam@89: jmp L_do_loop cannam@89: cannam@89: ALIGN 4 cannam@89: L_while_test: cannam@89: cmp [esp+24], edi cannam@89: jbe L_break_loop cannam@89: cmp [esp+12], esi cannam@89: jbe L_break_loop cannam@89: cannam@89: L_do_loop: cannam@89: cmp bl, 15 cannam@89: ja L_get_length_code /* if (15 < bits) */ cannam@89: cannam@89: xor eax, eax cannam@89: lodsw /* al = *(ushort *)in++ */ cannam@89: mov cl, bl /* cl = bits, needs it for shifting */ cannam@89: add bl, 16 /* bits += 16 */ cannam@89: shl eax, cl cannam@89: or edx, eax /* hold |= *((ushort *)in)++ << bits */ cannam@89: cannam@89: L_get_length_code: cannam@89: mov eax, [esp+56] /* eax = lmask */ cannam@89: and eax, edx /* eax &= hold */ cannam@89: mov eax, [ebp+eax*4] /* eax = lcode[hold & lmask] */ cannam@89: cannam@89: L_dolen: cannam@89: mov cl, ah /* cl = this.bits */ cannam@89: sub bl, ah /* bits -= this.bits */ cannam@89: shr edx, cl /* hold >>= this.bits */ cannam@89: cannam@89: test al, al cannam@89: jnz L_test_for_length_base /* if (op != 0) 45.7% */ cannam@89: cannam@89: shr eax, 16 /* output this.val char */ cannam@89: stosb cannam@89: jmp L_while_test cannam@89: cannam@89: ALIGN 4 cannam@89: L_test_for_length_base: cannam@89: mov ecx, eax /* len = this */ cannam@89: shr ecx, 16 /* len = this.val */ cannam@89: mov [esp+64], ecx /* save len */ cannam@89: mov cl, al cannam@89: cannam@89: test al, 16 cannam@89: jz L_test_for_second_level_length /* if ((op & 16) == 0) 8% */ cannam@89: and cl, 15 /* op &= 15 */ cannam@89: jz L_decode_distance /* if (!op) */ cannam@89: cmp bl, cl cannam@89: jae L_add_bits_to_len /* if (op <= bits) */ cannam@89: cannam@89: mov ch, cl /* stash op in ch, freeing cl */ cannam@89: xor eax, eax cannam@89: lodsw /* al = *(ushort *)in++ */ cannam@89: mov cl, bl /* cl = bits, needs it for shifting */ cannam@89: add bl, 16 /* bits += 16 */ cannam@89: shl eax, cl cannam@89: or edx, eax /* hold |= *((ushort *)in)++ << bits */ cannam@89: mov cl, ch /* move op back to ecx */ cannam@89: cannam@89: L_add_bits_to_len: cannam@89: sub bl, cl cannam@89: xor eax, eax cannam@89: inc eax cannam@89: shl eax, cl cannam@89: dec eax cannam@89: and eax, edx /* eax &= hold */ cannam@89: shr edx, cl cannam@89: add [esp+64], eax /* len += hold & mask[op] */ cannam@89: cannam@89: L_decode_distance: cannam@89: cmp bl, 15 cannam@89: ja L_get_distance_code /* if (15 < bits) */ cannam@89: cannam@89: xor eax, eax cannam@89: lodsw /* al = *(ushort *)in++ */ cannam@89: mov cl, bl /* cl = bits, needs it for shifting */ cannam@89: add bl, 16 /* bits += 16 */ cannam@89: shl eax, cl cannam@89: or edx, eax /* hold |= *((ushort *)in)++ << bits */ cannam@89: cannam@89: L_get_distance_code: cannam@89: mov eax, [esp+60] /* eax = dmask */ cannam@89: mov ecx, [esp+36] /* ecx = dcode */ cannam@89: and eax, edx /* eax &= hold */ cannam@89: mov eax, [ecx+eax*4]/* eax = dcode[hold & dmask] */ cannam@89: cannam@89: L_dodist: cannam@89: mov ebp, eax /* dist = this */ cannam@89: shr ebp, 16 /* dist = this.val */ cannam@89: mov cl, ah cannam@89: sub bl, ah /* bits -= this.bits */ cannam@89: shr edx, cl /* hold >>= this.bits */ cannam@89: mov cl, al /* cl = this.op */ cannam@89: cannam@89: test al, 16 /* if ((op & 16) == 0) */ cannam@89: jz L_test_for_second_level_dist cannam@89: and cl, 15 /* op &= 15 */ cannam@89: jz L_check_dist_one cannam@89: cmp bl, cl cannam@89: jae L_add_bits_to_dist /* if (op <= bits) 97.6% */ cannam@89: cannam@89: mov ch, cl /* stash op in ch, freeing cl */ cannam@89: xor eax, eax cannam@89: lodsw /* al = *(ushort *)in++ */ cannam@89: mov cl, bl /* cl = bits, needs it for shifting */ cannam@89: add bl, 16 /* bits += 16 */ cannam@89: shl eax, cl cannam@89: or edx, eax /* hold |= *((ushort *)in)++ << bits */ cannam@89: mov cl, ch /* move op back to ecx */ cannam@89: cannam@89: L_add_bits_to_dist: cannam@89: sub bl, cl cannam@89: xor eax, eax cannam@89: inc eax cannam@89: shl eax, cl cannam@89: dec eax /* (1 << op) - 1 */ cannam@89: and eax, edx /* eax &= hold */ cannam@89: shr edx, cl cannam@89: add ebp, eax /* dist += hold & ((1 << op) - 1) */ cannam@89: cannam@89: L_check_window: cannam@89: mov [esp+8], esi /* save in so from can use it's reg */ cannam@89: mov eax, edi cannam@89: sub eax, [esp+20] /* nbytes = out - beg */ cannam@89: cannam@89: cmp eax, ebp cannam@89: jb L_clip_window /* if (dist > nbytes) 4.2% */ cannam@89: cannam@89: mov ecx, [esp+64] /* ecx = len */ cannam@89: mov esi, edi cannam@89: sub esi, ebp /* from = out - dist */ cannam@89: cannam@89: sar ecx, 1 cannam@89: jnc L_copy_two cannam@89: cannam@89: rep movsw cannam@89: mov al, [esi] cannam@89: mov [edi], al cannam@89: inc edi cannam@89: cannam@89: mov esi, [esp+8] /* move in back to %esi, toss from */ cannam@89: mov ebp, [esp+32] /* ebp = lcode */ cannam@89: jmp L_while_test cannam@89: cannam@89: L_copy_two: cannam@89: rep movsw cannam@89: mov esi, [esp+8] /* move in back to %esi, toss from */ cannam@89: mov ebp, [esp+32] /* ebp = lcode */ cannam@89: jmp L_while_test cannam@89: cannam@89: ALIGN 4 cannam@89: L_check_dist_one: cannam@89: cmp ebp, 1 /* if dist 1, is a memset */ cannam@89: jne L_check_window cannam@89: cmp [esp+20], edi cannam@89: je L_check_window /* out == beg, if outside window */ cannam@89: cannam@89: mov ecx, [esp+64] /* ecx = len */ cannam@89: mov al, [edi-1] cannam@89: mov ah, al cannam@89: cannam@89: sar ecx, 1 cannam@89: jnc L_set_two cannam@89: mov [edi], al /* memset out with from[-1] */ cannam@89: inc edi cannam@89: cannam@89: L_set_two: cannam@89: rep stosw cannam@89: mov ebp, [esp+32] /* ebp = lcode */ cannam@89: jmp L_while_test cannam@89: cannam@89: ALIGN 4 cannam@89: L_test_for_second_level_length: cannam@89: test al, 64 cannam@89: jnz L_test_for_end_of_block /* if ((op & 64) != 0) */ cannam@89: cannam@89: xor eax, eax cannam@89: inc eax cannam@89: shl eax, cl cannam@89: dec eax cannam@89: and eax, edx /* eax &= hold */ cannam@89: add eax, [esp+64] /* eax += len */ cannam@89: mov eax, [ebp+eax*4] /* eax = lcode[val+(hold&mask[op])]*/ cannam@89: jmp L_dolen cannam@89: cannam@89: ALIGN 4 cannam@89: L_test_for_second_level_dist: cannam@89: test al, 64 cannam@89: jnz L_invalid_distance_code /* if ((op & 64) != 0) */ cannam@89: cannam@89: xor eax, eax cannam@89: inc eax cannam@89: shl eax, cl cannam@89: dec eax cannam@89: and eax, edx /* eax &= hold */ cannam@89: add eax, ebp /* eax += dist */ cannam@89: mov ecx, [esp+36] /* ecx = dcode */ cannam@89: mov eax, [ecx+eax*4] /* eax = dcode[val+(hold&mask[op])]*/ cannam@89: jmp L_dodist cannam@89: cannam@89: ALIGN 4 cannam@89: L_clip_window: cannam@89: mov ecx, eax cannam@89: mov eax, [esp+48] /* eax = wsize */ cannam@89: neg ecx /* nbytes = -nbytes */ cannam@89: mov esi, [esp+28] /* from = window */ cannam@89: cannam@89: cmp eax, ebp cannam@89: jb L_invalid_distance_too_far /* if (dist > wsize) */ cannam@89: cannam@89: add ecx, ebp /* nbytes = dist - nbytes */ cannam@89: cmp dword ptr [esp+52], 0 cannam@89: jne L_wrap_around_window /* if (write != 0) */ cannam@89: cannam@89: sub eax, ecx cannam@89: add esi, eax /* from += wsize - nbytes */ cannam@89: cannam@89: mov eax, [esp+64] /* eax = len */ cannam@89: cmp eax, ecx cannam@89: jbe L_do_copy /* if (nbytes >= len) */ cannam@89: cannam@89: sub eax, ecx /* len -= nbytes */ cannam@89: rep movsb cannam@89: mov esi, edi cannam@89: sub esi, ebp /* from = out - dist */ cannam@89: jmp L_do_copy cannam@89: cannam@89: ALIGN 4 cannam@89: L_wrap_around_window: cannam@89: mov eax, [esp+52] /* eax = write */ cannam@89: cmp ecx, eax cannam@89: jbe L_contiguous_in_window /* if (write >= nbytes) */ cannam@89: cannam@89: add esi, [esp+48] /* from += wsize */ cannam@89: add esi, eax /* from += write */ cannam@89: sub esi, ecx /* from -= nbytes */ cannam@89: sub ecx, eax /* nbytes -= write */ cannam@89: cannam@89: mov eax, [esp+64] /* eax = len */ cannam@89: cmp eax, ecx cannam@89: jbe L_do_copy /* if (nbytes >= len) */ cannam@89: cannam@89: sub eax, ecx /* len -= nbytes */ cannam@89: rep movsb cannam@89: mov esi, [esp+28] /* from = window */ cannam@89: mov ecx, [esp+52] /* nbytes = write */ cannam@89: cmp eax, ecx cannam@89: jbe L_do_copy /* if (nbytes >= len) */ cannam@89: cannam@89: sub eax, ecx /* len -= nbytes */ cannam@89: rep movsb cannam@89: mov esi, edi cannam@89: sub esi, ebp /* from = out - dist */ cannam@89: jmp L_do_copy cannam@89: cannam@89: ALIGN 4 cannam@89: L_contiguous_in_window: cannam@89: add esi, eax cannam@89: sub esi, ecx /* from += write - nbytes */ cannam@89: cannam@89: mov eax, [esp+64] /* eax = len */ cannam@89: cmp eax, ecx cannam@89: jbe L_do_copy /* if (nbytes >= len) */ cannam@89: cannam@89: sub eax, ecx /* len -= nbytes */ cannam@89: rep movsb cannam@89: mov esi, edi cannam@89: sub esi, ebp /* from = out - dist */ cannam@89: jmp L_do_copy cannam@89: cannam@89: ALIGN 4 cannam@89: L_do_copy: cannam@89: mov ecx, eax cannam@89: rep movsb cannam@89: cannam@89: mov esi, [esp+8] /* move in back to %esi, toss from */ cannam@89: mov ebp, [esp+32] /* ebp = lcode */ cannam@89: jmp L_while_test cannam@89: cannam@89: L_test_for_end_of_block: cannam@89: test al, 32 cannam@89: jz L_invalid_literal_length_code cannam@89: mov dword ptr [esp+72], 1 cannam@89: jmp L_break_loop_with_status cannam@89: cannam@89: L_invalid_literal_length_code: cannam@89: mov dword ptr [esp+72], 2 cannam@89: jmp L_break_loop_with_status cannam@89: cannam@89: L_invalid_distance_code: cannam@89: mov dword ptr [esp+72], 3 cannam@89: jmp L_break_loop_with_status cannam@89: cannam@89: L_invalid_distance_too_far: cannam@89: mov esi, [esp+4] cannam@89: mov dword ptr [esp+72], 4 cannam@89: jmp L_break_loop_with_status cannam@89: cannam@89: L_break_loop: cannam@89: mov dword ptr [esp+72], 0 cannam@89: cannam@89: L_break_loop_with_status: cannam@89: /* put in, out, bits, and hold back into ar and pop esp */ cannam@89: mov [esp+8], esi /* save in */ cannam@89: mov [esp+16], edi /* save out */ cannam@89: mov [esp+44], ebx /* save bits */ cannam@89: mov [esp+40], edx /* save hold */ cannam@89: mov ebp, [esp+4] /* restore esp, ebp */ cannam@89: mov esp, [esp] cannam@89: } cannam@89: #else cannam@89: #error "x86 architecture not defined" cannam@89: #endif cannam@89: cannam@89: if (ar.status > 1) { cannam@89: if (ar.status == 2) cannam@89: strm->msg = "invalid literal/length code"; cannam@89: else if (ar.status == 3) cannam@89: strm->msg = "invalid distance code"; cannam@89: else cannam@89: strm->msg = "invalid distance too far back"; cannam@89: state->mode = BAD; cannam@89: } cannam@89: else if ( ar.status == 1 ) { cannam@89: state->mode = TYPE; cannam@89: } cannam@89: cannam@89: /* return unused bytes (on entry, bits < 8, so in won't go too far back) */ cannam@89: ar.len = ar.bits >> 3; cannam@89: ar.in -= ar.len; cannam@89: ar.bits -= ar.len << 3; cannam@89: ar.hold &= (1U << ar.bits) - 1; cannam@89: cannam@89: /* update state and return */ cannam@89: strm->next_in = ar.in; cannam@89: strm->next_out = ar.out; cannam@89: strm->avail_in = (unsigned)(ar.in < ar.last ? cannam@89: PAD_AVAIL_IN + (ar.last - ar.in) : cannam@89: PAD_AVAIL_IN - (ar.in - ar.last)); cannam@89: strm->avail_out = (unsigned)(ar.out < ar.end ? cannam@89: PAD_AVAIL_OUT + (ar.end - ar.out) : cannam@89: PAD_AVAIL_OUT - (ar.out - ar.end)); cannam@89: state->hold = ar.hold; cannam@89: state->bits = ar.bits; cannam@89: return; cannam@89: } cannam@89: