/* 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 * 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; }