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bc22c17e12
Impact: Replaces inflate.c with a wrapper around zlib_inflate; new library code This is the first part of the bzip2/lzma patch The bzip patch is based on an idea by Christian Ludwig, includes support for compressing the kernel with bzip2 or lzma rather than gzip. Both compressors give smaller sizes than gzip. Lzma's decompresses faster than bzip2. It also supports ramdisks and initramfs' compressed using these two compressors. The functionality has been successfully used for a couple of years by the udpcast project This version applies to "tip" kernel 2.6.28 This part contains: - changed inflate.c to accomodate rest of patch - implementation of bzip2 compression (not used at this stage yet) - implementation of lzma compression (not used at this stage yet) - Makefile routines to support bzip2 and lzma kernel compression Signed-off-by: Alain Knaff <alain@knaff.lu> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
111 lines
5.5 KiB
C
111 lines
5.5 KiB
C
#ifndef INFLATE_H
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#define INFLATE_H
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/* inflate.h -- internal inflate state definition
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* Copyright (C) 1995-2004 Mark Adler
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* For conditions of distribution and use, see copyright notice in zlib.h
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*/
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/* WARNING: this file should *not* be used by applications. It is
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part of the implementation of the compression library and is
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subject to change. Applications should only use zlib.h.
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*/
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/* Possible inflate modes between inflate() calls */
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typedef enum {
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HEAD, /* i: waiting for magic header */
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FLAGS, /* i: waiting for method and flags (gzip) */
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TIME, /* i: waiting for modification time (gzip) */
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OS, /* i: waiting for extra flags and operating system (gzip) */
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EXLEN, /* i: waiting for extra length (gzip) */
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EXTRA, /* i: waiting for extra bytes (gzip) */
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NAME, /* i: waiting for end of file name (gzip) */
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COMMENT, /* i: waiting for end of comment (gzip) */
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HCRC, /* i: waiting for header crc (gzip) */
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DICTID, /* i: waiting for dictionary check value */
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DICT, /* waiting for inflateSetDictionary() call */
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TYPE, /* i: waiting for type bits, including last-flag bit */
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TYPEDO, /* i: same, but skip check to exit inflate on new block */
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STORED, /* i: waiting for stored size (length and complement) */
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COPY, /* i/o: waiting for input or output to copy stored block */
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TABLE, /* i: waiting for dynamic block table lengths */
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LENLENS, /* i: waiting for code length code lengths */
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CODELENS, /* i: waiting for length/lit and distance code lengths */
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LEN, /* i: waiting for length/lit code */
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LENEXT, /* i: waiting for length extra bits */
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DIST, /* i: waiting for distance code */
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DISTEXT, /* i: waiting for distance extra bits */
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MATCH, /* o: waiting for output space to copy string */
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LIT, /* o: waiting for output space to write literal */
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CHECK, /* i: waiting for 32-bit check value */
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LENGTH, /* i: waiting for 32-bit length (gzip) */
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DONE, /* finished check, done -- remain here until reset */
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BAD, /* got a data error -- remain here until reset */
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MEM, /* got an inflate() memory error -- remain here until reset */
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SYNC /* looking for synchronization bytes to restart inflate() */
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} inflate_mode;
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/*
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State transitions between above modes -
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(most modes can go to the BAD or MEM mode -- not shown for clarity)
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Process header:
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HEAD -> (gzip) or (zlib)
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(gzip) -> FLAGS -> TIME -> OS -> EXLEN -> EXTRA -> NAME
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NAME -> COMMENT -> HCRC -> TYPE
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(zlib) -> DICTID or TYPE
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DICTID -> DICT -> TYPE
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Read deflate blocks:
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TYPE -> STORED or TABLE or LEN or CHECK
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STORED -> COPY -> TYPE
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TABLE -> LENLENS -> CODELENS -> LEN
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Read deflate codes:
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LEN -> LENEXT or LIT or TYPE
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LENEXT -> DIST -> DISTEXT -> MATCH -> LEN
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LIT -> LEN
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Process trailer:
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CHECK -> LENGTH -> DONE
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*/
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/* state maintained between inflate() calls. Approximately 7K bytes. */
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struct inflate_state {
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inflate_mode mode; /* current inflate mode */
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int last; /* true if processing last block */
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int wrap; /* bit 0 true for zlib, bit 1 true for gzip */
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int havedict; /* true if dictionary provided */
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int flags; /* gzip header method and flags (0 if zlib) */
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unsigned dmax; /* zlib header max distance (INFLATE_STRICT) */
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unsigned long check; /* protected copy of check value */
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unsigned long total; /* protected copy of output count */
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/* gz_headerp head; */ /* where to save gzip header information */
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/* sliding window */
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unsigned wbits; /* log base 2 of requested window size */
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unsigned wsize; /* window size or zero if not using window */
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unsigned whave; /* valid bytes in the window */
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unsigned write; /* window write index */
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unsigned char *window; /* allocated sliding window, if needed */
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/* bit accumulator */
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unsigned long hold; /* input bit accumulator */
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unsigned bits; /* number of bits in "in" */
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/* for string and stored block copying */
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unsigned length; /* literal or length of data to copy */
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unsigned offset; /* distance back to copy string from */
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/* for table and code decoding */
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unsigned extra; /* extra bits needed */
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/* fixed and dynamic code tables */
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code const *lencode; /* starting table for length/literal codes */
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code const *distcode; /* starting table for distance codes */
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unsigned lenbits; /* index bits for lencode */
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unsigned distbits; /* index bits for distcode */
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/* dynamic table building */
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unsigned ncode; /* number of code length code lengths */
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unsigned nlen; /* number of length code lengths */
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unsigned ndist; /* number of distance code lengths */
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unsigned have; /* number of code lengths in lens[] */
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code *next; /* next available space in codes[] */
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unsigned short lens[320]; /* temporary storage for code lengths */
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unsigned short work[288]; /* work area for code table building */
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code codes[ENOUGH]; /* space for code tables */
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};
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#endif
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