| /* inflate9.h -- internal inflate state definition |
| * Copyright (C) 1995-2003 Mark Adler |
| * For conditions of distribution and use, see copyright notice in zlib.h |
| */ |
| |
| /* WARNING: this file should *not* be used by applications. It is |
| part of the implementation of the compression library and is |
| subject to change. Applications should only use zlib.h. |
| */ |
| |
| /* Possible inflate modes between inflate() calls */ |
| typedef enum { |
| TYPE, /* i: waiting for type bits, including last-flag bit */ |
| STORED, /* i: waiting for stored size (length and complement) */ |
| TABLE, /* i: waiting for dynamic block table lengths */ |
| LEN, /* i: waiting for length/lit code */ |
| DONE, /* finished check, done -- remain here until reset */ |
| BAD /* got a data error -- remain here until reset */ |
| } inflate_mode; |
| |
| /* |
| State transitions between above modes - |
| |
| (most modes can go to the BAD mode -- not shown for clarity) |
| |
| Read deflate blocks: |
| TYPE -> STORED or TABLE or LEN or DONE |
| STORED -> TYPE |
| TABLE -> LENLENS -> CODELENS -> LEN |
| Read deflate codes: |
| LEN -> LEN or TYPE |
| */ |
| |
| /* state maintained between inflate() calls. Approximately 7K bytes. */ |
| struct inflate_state { |
| /* sliding window */ |
| unsigned char FAR *window; /* allocated sliding window, if needed */ |
| /* dynamic table building */ |
| unsigned ncode; /* number of code length code lengths */ |
| unsigned nlen; /* number of length code lengths */ |
| unsigned ndist; /* number of distance code lengths */ |
| unsigned have; /* number of code lengths in lens[] */ |
| code FAR *next; /* next available space in codes[] */ |
| unsigned short lens[320]; /* temporary storage for code lengths */ |
| unsigned short work[288]; /* work area for code table building */ |
| code codes[ENOUGH]; /* space for code tables */ |
| }; |
