18b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* inftrees.h -- header to use inftrees.c 28b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * Copyright (C) 1995-2005 Mark Adler 38b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project * For conditions of distribution and use, see copyright notice in zlib.h 48b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 58b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 68b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* WARNING: this file should *not* be used by applications. It is 78b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project part of the implementation of the compression library and is 88b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project subject to change. Applications should only use zlib.h. 98b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 108b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 118b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Structure for decoding tables. Each entry provides either the 128b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project information needed to do the operation requested by the code that 138b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project indexed that table entry, or it provides a pointer to another 148b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project table that indexes more bits of the code. op indicates whether 158b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project the entry is a pointer to another table, a literal, a length or 168b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project distance, an end-of-block, or an invalid code. For a table 178b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project pointer, the low four bits of op is the number of index bits of 188b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project that table. For a length or distance, the low four bits of op 198b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project is the number of extra bits to get after the code. bits is 208b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project the number of bits in this code or part of the code to drop off 218b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project of the bit buffer. val is the actual byte to output in the case 228b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project of a literal, the base length or distance, or the offset from 238b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project the current table to the next table. Each entry is four bytes. */ 248b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projecttypedef struct { 258b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project unsigned char op; /* operation, extra bits, table bits */ 268b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project unsigned char bits; /* bits in this part of the code */ 278b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project unsigned short val; /* offset in table or code value */ 288b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} code; 298b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 308b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* op values as set by inflate_table(): 318b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 00000000 - literal 328b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 0000tttt - table link, tttt != 0 is the number of table index bits 338b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 0001eeee - length or distance, eeee is the number of extra bits 348b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 01100000 - end of block 358b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 01000000 - invalid code 368b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project */ 378b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 388b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Maximum size of dynamic tree. The maximum found in a long but non- 398b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project exhaustive search was 1444 code structures (852 for length/literals 408b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project and 592 for distances, the latter actually the result of an 418b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project exhaustive search). The true maximum is not known, but the value 428b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project below is more than safe. */ 438b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#define ENOUGH 2048 448b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project#define MAXD 592 458b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 468b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project/* Type of code to build for inftable() */ 478b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projecttypedef enum { 488b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project CODES, 498b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project LENS, 508b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project DISTS 518b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project} codetype; 528b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project 538b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Projectextern int inflate_table OF((codetype type, unsigned short FAR *lens, 548b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project unsigned codes, code FAR * FAR *table, 558b23a6c7e1aee255004dd19098d4c2462b61b849The Android Open Source Project unsigned FAR *bits, unsigned short FAR *work)); 56