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-rw-r--r--zlib/contrib/inflate86/inffas86.c783
1 files changed, 783 insertions, 0 deletions
diff --git a/zlib/contrib/inflate86/inffas86.c b/zlib/contrib/inflate86/inffas86.c
new file mode 100644
index 00000000000..4534693a47d
--- /dev/null
+++ b/zlib/contrib/inflate86/inffas86.c
@@ -0,0 +1,783 @@
+/* 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.
+ *
+ * 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 {
+ void *esp; /* esp save */
+ unsigned char FAR *in; /* local strm->next_in */
+ unsigned char FAR *last; /* while in < last, enough input available */
+ unsigned char FAR *out; /* local strm->next_out */
+ unsigned char FAR *beg; /* inflate()'s initial strm->next_out */
+ unsigned char FAR *end; /* while out < end, enough space available */
+ unsigned wsize; /* window size or zero if not using window */
+ unsigned write; /* window write index */
+ unsigned char FAR *window; /* allocated sliding window, if wsize != 0 */
+ unsigned long hold; /* local strm->hold */
+ unsigned bits; /* local strm->bits */
+ code const FAR *lcode; /* local strm->lencode */
+ code const FAR *dcode; /* local strm->distcode */
+ unsigned lmask; /* mask for first level of length codes */
+ unsigned dmask; /* mask for first level of distance codes */
+ unsigned len; /* match length, unused bytes */
+ unsigned dist; /* match distance */
+ unsigned status; /* this is set when state changes */
+ } ar;
+
+ /* copy state to local variables */
+ state = (struct inflate_state FAR *)strm->state;
+ ar.in = strm->next_in;
+ ar.last = ar.in + (strm->avail_in - 5);
+ ar.out = strm->next_out;
+ ar.beg = ar.out - (start - strm->avail_out);
+ ar.end = ar.out + (strm->avail_out - 257);
+ ar.wsize = state->wsize;
+ ar.write = state->write;
+ 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 2 byte boundary */
+ if (((unsigned long)(void *)ar.in & 0x1) != 0) {
+ ar.hold += (unsigned long)*ar.in++ << ar.bits;
+ ar.bits += 8;
+ }
+
+#if defined( __GNUC__ ) || defined( __ICC )
+ __asm__ __volatile__ (
+" leal %0, %%eax\n"
+" pushf\n"
+" pushl %%ebp\n"
+" movl %%esp, (%%eax)\n"
+" movl %%eax, %%esp\n"
+" movl 4(%%esp), %%esi\n" /* esi = in */
+" movl 12(%%esp), %%edi\n" /* edi = out */
+" movl 36(%%esp), %%edx\n" /* edx = hold */
+" movl 40(%%esp), %%ebx\n" /* ebx = bits */
+" movl 44(%%esp), %%ebp\n" /* ebp = lcode */
+
+" cld\n"
+" jmp .L_do_loop\n"
+
+".L_while_test:\n"
+" cmpl %%edi, 20(%%esp)\n"
+" jbe .L_break_loop\n"
+" cmpl %%esi, 8(%%esp)\n"
+" 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 52(%%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"
+
+".L_test_for_length_base:\n"
+" movl %%eax, %%ecx\n" /* len = this */
+" shrl $16, %%ecx\n" /* len = this.val */
+" movl %%ecx, 60(%%esp)\n" /* len = this */
+" 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"
+" movl $1, %%eax\n"
+" shll %%cl, %%eax\n"
+" decl %%eax\n"
+" subb %%cl, %%bl\n"
+" andl %%edx, %%eax\n" /* eax &= hold */
+" shrl %%cl, %%edx\n"
+" addl %%eax, 60(%%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 56(%%esp), %%eax\n" /* eax = dmask */
+" movl 48(%%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"
+" movl $1, %%eax\n"
+" shll %%cl, %%eax\n"
+" decl %%eax\n" /* (1 << op) - 1 */
+" subb %%cl, %%bl\n"
+" 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, 4(%%esp)\n" /* save in so from can use it's reg */
+" movl %%edi, %%eax\n"
+" subl 16(%%esp), %%eax\n" /* nbytes = out - beg */
+
+" cmpl %%ebp, %%eax\n"
+" jb .L_clip_window\n" /* if (dist > nbytes) 4.2% */
+
+" movl 60(%%esp), %%ecx\n"
+" movl %%edi, %%esi\n"
+" subl %%ebp, %%esi\n" /* from = out - dist */
+
+" subl $3, %%ecx\n" /* copy from to out */
+" movb (%%esi), %%al\n"
+" movb %%al, (%%edi)\n"
+" movb 1(%%esi), %%al\n"
+" movb 2(%%esi), %%ah\n"
+" addl $3, %%esi\n"
+" movb %%al, 1(%%edi)\n"
+" movb %%ah, 2(%%edi)\n"
+" addl $3, %%edi\n"
+" rep movsb\n"
+
+" movl 4(%%esp), %%esi\n" /* move in back to %esi, toss from */
+" movl 44(%%esp), %%ebp\n" /* ebp = lcode */
+" jmp .L_while_test\n"
+
+".L_check_dist_one:\n"
+" cmpl $1, %%ebp\n" /* if dist 1, is a memset */
+" jne .L_check_window\n"
+" cmpl %%edi, 16(%%esp)\n"
+" je .L_check_window\n"
+
+" decl %%edi\n"
+" movl 60(%%esp), %%ecx\n"
+" movb (%%edi), %%al\n"
+" subl $3, %%ecx\n"
+
+" movb %%al, 1(%%edi)\n" /* memset out with from[-1] */
+" movb %%al, 2(%%edi)\n"
+" movb %%al, 3(%%edi)\n"
+" addl $4, %%edi\n"
+" rep stosb\n"
+" movl 44(%%esp), %%ebp\n" /* ebp = lcode */
+" jmp .L_while_test\n"
+
+".L_test_for_second_level_length:\n"
+" testb $64, %%al\n"
+" jnz .L_test_for_end_of_block\n" /* if ((op & 64) != 0) */
+
+" movl $1, %%eax\n"
+" shll %%cl, %%eax\n"
+" decl %%eax\n"
+" andl %%edx, %%eax\n" /* eax &= hold */
+" addl 60(%%esp), %%eax\n" /* eax += this.val */
+" movl (%%ebp,%%eax,4), %%eax\n" /* eax = lcode[val+(hold&mask[op])]*/
+" jmp .L_dolen\n"
+
+".L_test_for_second_level_dist:\n"
+" testb $64, %%al\n"
+" jnz .L_invalid_distance_code\n" /* if ((op & 64) != 0) */
+
+" movl $1, %%eax\n"
+" shll %%cl, %%eax\n"
+" decl %%eax\n"
+" andl %%edx, %%eax\n" /* eax &= hold */
+" addl %%ebp, %%eax\n" /* eax += this.val */
+" movl 48(%%esp), %%ecx\n" /* ecx = dcode */
+" movl (%%ecx,%%eax,4), %%eax\n" /* eax = dcode[val+(hold&mask[op])]*/
+" jmp .L_dodist\n"
+
+".L_clip_window:\n"
+" movl %%eax, %%ecx\n"
+" movl 24(%%esp), %%eax\n" /* prepare for dist compare */
+" negl %%ecx\n" /* nbytes = -nbytes */
+" movl 32(%%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, 28(%%esp)\n"
+" jne .L_wrap_around_window\n" /* if (write != 0) */
+
+" subl %%ecx, %%eax\n"
+" addl %%eax, %%esi\n" /* from += wsize - nbytes */
+
+" movl 60(%%esp), %%eax\n"
+" cmpl %%ecx, %%eax\n"
+" jbe .L_do_copy1\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_copy1\n"
+
+" cmpl %%ecx, %%eax\n"
+" jbe .L_do_copy1\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_copy1\n"
+
+".L_wrap_around_window:\n"
+" movl 28(%%esp), %%eax\n"
+" cmpl %%eax, %%ecx\n"
+" jbe .L_contiguous_in_window\n" /* if (write >= nbytes) */
+
+" addl 24(%%esp), %%esi\n"
+" addl %%eax, %%esi\n"
+" subl %%ecx, %%esi\n" /* from += wsize + write - nbytes */
+" subl %%eax, %%ecx\n" /* nbytes -= write */
+
+" movl 60(%%esp), %%eax\n"
+" cmpl %%ecx, %%eax\n"
+" jbe .L_do_copy1\n" /* if (nbytes >= len) */
+
+" subl %%ecx, %%eax\n" /* len -= nbytes */
+" rep movsb\n"
+" movl 32(%%esp), %%esi\n" /* from = window */
+" movl 28(%%esp), %%ecx\n" /* nbytes = write */
+" cmpl %%ecx, %%eax\n"
+" jbe .L_do_copy1\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_copy1\n"
+
+".L_contiguous_in_window:\n"
+" addl %%eax, %%esi\n"
+" subl %%ecx, %%esi\n" /* from += write - nbytes */
+
+" movl 60(%%esp), %%eax\n"
+" cmpl %%ecx, %%eax\n"
+" jbe .L_do_copy1\n" /* if (nbytes >= len) */
+
+" subl %%ecx, %%eax\n" /* len -= nbytes */
+" rep movsb\n"
+" movl %%edi, %%esi\n"
+" subl %%ebp, %%esi\n" /* from = out - dist */
+
+".L_do_copy1:\n"
+" movl %%eax, %%ecx\n"
+" rep movsb\n"
+
+" movl 4(%%esp), %%esi\n" /* move in back to %esi, toss from */
+" movl 44(%%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, 68(%%esp)\n"
+" jmp .L_break_loop_with_status\n"
+
+".L_invalid_literal_length_code:\n"
+" movl $2, 68(%%esp)\n"
+" jmp .L_break_loop_with_status\n"
+
+".L_invalid_distance_code:\n"
+" movl $3, 68(%%esp)\n"
+" jmp .L_break_loop_with_status\n"
+
+".L_invalid_distance_too_far:\n"
+" movl 4(%%esp), %%esi\n"
+" movl $4, 68(%%esp)\n"
+" jmp .L_break_loop_with_status\n"
+
+".L_break_loop:\n"
+" movl $0, 68(%%esp)\n"
+
+".L_break_loop_with_status:\n"
+/* put in, out, bits, and hold back into ar and pop esp */
+" movl %%esi, 4(%%esp)\n"
+" movl %%edi, 12(%%esp)\n"
+" movl %%ebx, 40(%%esp)\n"
+" movl %%edx, 36(%%esp)\n"
+" movl (%%esp), %%esp\n"
+" popl %%ebp\n"
+" popf\n"
+ :
+ : "m" (ar)
+ : "memory", "%eax", "%ebx", "%ecx", "%edx", "%esi", "%edi"
+ );
+#elif defined( _MSC_VER )
+ __asm {
+ lea eax, ar
+ pushfd
+ push ebp
+ mov [eax], esp
+ mov esp, eax
+ mov esi, [esp+4] /* esi = in */
+ mov edi, [esp+12] /* edi = out */
+ mov edx, [esp+36] /* edx = hold */
+ mov ebx, [esp+40] /* ebx = bits */
+ mov ebp, [esp+44] /* ebp = lcode */
+
+ cld
+ jmp L_do_loop
+
+L_while_test:
+ cmp [esp+20], edi
+ jbe L_break_loop
+ cmp [esp+8], 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+52] /* 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
+
+L_test_for_length_base:
+ mov ecx, eax /* len = this */
+ shr ecx, 16 /* len = this.val */
+ mov [esp+60], ecx /* len = this */
+ 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:
+ mov eax, 1
+ shl eax, cl
+ dec eax
+ sub bl, cl
+ and eax, edx /* eax &= hold */
+ shr edx, cl
+ add [esp+60], 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+56] /* eax = dmask */
+ mov ecx, [esp+48] /* 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:
+ mov eax, 1
+ shl eax, cl
+ dec eax /* (1 << op) - 1 */
+ sub bl, cl
+ and eax, edx /* eax &= hold */
+ shr edx, cl
+ add ebp, eax /* dist += hold & ((1 << op) - 1) */
+
+L_check_window:
+ mov [esp+4], esi /* save in so from can use it's reg */
+ mov eax, edi
+ sub eax, [esp+16] /* nbytes = out - beg */
+
+ cmp eax, ebp
+ jb L_clip_window /* if (dist > nbytes) 4.2% */
+
+ mov ecx, [esp+60]
+ mov esi, edi
+ sub esi, ebp /* from = out - dist */
+
+ sub ecx, 3 /* copy from to out */
+ mov al, [esi]
+ mov [edi], al
+ mov al, [esi+1]
+ mov ah, [esi+2]
+ add esi, 3
+ mov [edi+1], al
+ mov [edi+2], ah
+ add edi, 3
+ rep movsb
+
+ mov esi, [esp+4] /* move in back to %esi, toss from */
+ mov ebp, [esp+44] /* ebp = lcode */
+ jmp L_while_test
+
+L_check_dist_one:
+ cmp ebp, 1 /* if dist 1, is a memset */
+ jne L_check_window
+ cmp [esp+16], edi
+ je L_check_window
+
+ dec edi
+ mov ecx, [esp+60]
+ mov al, [edi]
+ sub ecx, 3
+
+ mov [edi+1], al /* memset out with from[-1] */
+ mov [edi+2], al
+ mov [edi+3], al
+ add edi, 4
+ rep stosb
+ mov ebp, [esp+44] /* ebp = lcode */
+ jmp L_while_test
+
+L_test_for_second_level_length:
+ test al, 64
+ jnz L_test_for_end_of_block /* if ((op & 64) != 0) */
+
+ mov eax, 1
+ shl eax, cl
+ dec eax
+ and eax, edx /* eax &= hold */
+ add eax, [esp+60] /* eax += this.val */
+ mov eax, [ebp+eax*4] /* eax = lcode[val+(hold&mask[op])]*/
+ jmp L_dolen
+
+L_test_for_second_level_dist:
+ test al, 64
+ jnz L_invalid_distance_code /* if ((op & 64) != 0) */
+
+ mov eax, 1
+ shl eax, cl
+ dec eax
+ and eax, edx /* eax &= hold */
+ add eax, ebp /* eax += this.val */
+ mov ecx, [esp+48] /* ecx = dcode */
+ mov eax, [ecx+eax*4] /* eax = dcode[val+(hold&mask[op])]*/
+ jmp L_dodist
+
+L_clip_window:
+ mov ecx, eax
+ mov eax, [esp+24] /* prepare for dist compare */
+ neg ecx /* nbytes = -nbytes */
+ mov esi, [esp+32] /* from = window */
+
+ cmp eax, ebp
+ jb L_invalid_distance_too_far /* if (dist > wsize) */
+
+ add ecx, ebp /* nbytes = dist - nbytes */
+ cmp dword ptr [esp+28], 0
+ jne L_wrap_around_window /* if (write != 0) */
+
+ sub eax, ecx
+ add esi, eax /* from += wsize - nbytes */
+
+ mov eax, [esp+60]
+ cmp eax, ecx
+ jbe L_do_copy1 /* if (nbytes >= len) */
+
+ sub eax, ecx /* len -= nbytes */
+ rep movsb
+ mov esi, edi
+ sub esi, ebp /* from = out - dist */
+ jmp L_do_copy1
+
+ cmp eax, ecx
+ jbe L_do_copy1 /* if (nbytes >= len) */
+
+ sub eax, ecx /* len -= nbytes */
+ rep movsb
+ mov esi, edi
+ sub esi, ebp /* from = out - dist */
+ jmp L_do_copy1
+
+L_wrap_around_window:
+ mov eax, [esp+28]
+ cmp ecx, eax
+ jbe L_contiguous_in_window /* if (write >= nbytes) */
+
+ add esi, [esp+24]
+ add esi, eax
+ sub esi, ecx /* from += wsize + write - nbytes */
+ sub ecx, eax /* nbytes -= write */
+
+ mov eax, [esp+60]
+ cmp eax, ecx
+ jbe L_do_copy1 /* if (nbytes >= len) */
+
+ sub eax, ecx /* len -= nbytes */
+ rep movsb
+ mov esi, [esp+32] /* from = window */
+ mov ecx, [esp+28] /* nbytes = write */
+ cmp eax, ecx
+ jbe L_do_copy1 /* if (nbytes >= len) */
+
+ sub eax, ecx /* len -= nbytes */
+ rep movsb
+ mov esi, edi
+ sub esi, ebp /* from = out - dist */
+ jmp L_do_copy1
+
+L_contiguous_in_window:
+ add esi, eax
+ sub esi, ecx /* from += write - nbytes */
+
+ mov eax, [esp+60]
+ cmp eax, ecx
+ jbe L_do_copy1 /* if (nbytes >= len) */
+
+ sub eax, ecx /* len -= nbytes */
+ rep movsb
+ mov esi, edi
+ sub esi, ebp /* from = out - dist */
+
+L_do_copy1:
+ mov ecx, eax
+ rep movsb
+
+ mov esi, [esp+4] /* move in back to %esi, toss from */
+ mov ebp, [esp+44] /* 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+68], 1
+ jmp L_break_loop_with_status
+
+L_invalid_literal_length_code:
+ mov dword ptr [esp+68], 2
+ jmp L_break_loop_with_status
+
+L_invalid_distance_code:
+ mov dword ptr [esp+68], 3
+ jmp L_break_loop_with_status
+
+L_invalid_distance_too_far:
+ mov esi, [esp+4]
+ mov dword ptr [esp+68], 4
+ jmp L_break_loop_with_status
+
+L_break_loop:
+ mov dword ptr [esp+68], 0
+
+L_break_loop_with_status:
+/* put in, out, bits, and hold back into ar and pop esp */
+ mov [esp+4], esi
+ mov [esp+12], edi
+ mov [esp+40], ebx
+ mov [esp+36], edx
+ mov esp, [esp]
+ pop ebp
+ popfd
+ }
+#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 ? 5 + (ar.last - ar.in) :
+ 5 - (ar.in - ar.last));
+ strm->avail_out = (unsigned)(ar.out < ar.end ? 257 + (ar.end - ar.out) :
+ 257 - (ar.out - ar.end));
+ state->hold = ar.hold;
+ state->bits = ar.bits;
+ return;
+}
+
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