1b33c96954667ba382fa595baf7b31290bfdd517vboxsync/* inftree9.h -- header to use inftree9.c
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync * Copyright (C) 1995-2008 Mark Adler
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync * For conditions of distribution and use, see copyright notice in zlib.h
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync/* WARNING: this file should *not* be used by applications. It is
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync part of the implementation of the compression library and is
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync subject to change. Applications should only use zlib.h.
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync/* Structure for decoding tables. Each entry provides either the
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync information needed to do the operation requested by the code that
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync indexed that table entry, or it provides a pointer to another
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync table that indexes more bits of the code. op indicates whether
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync the entry is a pointer to another table, a literal, a length or
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync distance, an end-of-block, or an invalid code. For a table
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync pointer, the low four bits of op is the number of index bits of
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync that table. For a length or distance, the low four bits of op
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync is the number of extra bits to get after the code. bits is
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync the number of bits in this code or part of the code to drop off
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync of the bit buffer. val is the actual byte to output in the case
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync of a literal, the base length or distance, or the offset from
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync the current table to the next table. Each entry is four bytes. */
1b33c96954667ba382fa595baf7b31290bfdd517vboxsynctypedef struct {
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync unsigned char op; /* operation, extra bits, table bits */
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync unsigned char bits; /* bits in this part of the code */
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync unsigned short val; /* offset in table or code value */
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync/* op values as set by inflate_table():
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync 00000000 - literal
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync 0000tttt - table link, tttt != 0 is the number of table index bits
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync 100eeeee - length or distance, eeee is the number of extra bits
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync 01100000 - end of block
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync 01000000 - invalid code
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync/* Maximum size of the dynamic table. The maximum number of code structures is
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync 1446, which is the sum of 852 for literal/length codes and 594 for distance
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync codes. These values were found by exhaustive searches using the program
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync examples/enough.c found in the zlib distribtution. The arguments to that
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync program are the number of symbols, the initial root table size, and the
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync maximum bit length of a code. "enough 286 9 15" for literal/length codes
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync returns returns 852, and "enough 32 6 15" for distance codes returns 594.
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync The initial root table size (9 or 6) is found in the fifth argument of the
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync inflate_table() calls in infback9.c. If the root table size is changed,
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync then these maximum sizes would be need to be recalculated and updated. */
1b33c96954667ba382fa595baf7b31290bfdd517vboxsync/* Type of code to build for inflate_table9() */
1b33c96954667ba382fa595baf7b31290bfdd517vboxsynctypedef enum {
1b33c96954667ba382fa595baf7b31290bfdd517vboxsyncextern int inflate_table9 OF((codetype type, unsigned short FAR *lens,