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Diffstat (limited to 'package/heirloom-cpio/src/inflate.c')
| -rw-r--r-- | package/heirloom-cpio/src/inflate.c | 991 |
1 files changed, 991 insertions, 0 deletions
diff --git a/package/heirloom-cpio/src/inflate.c b/package/heirloom-cpio/src/inflate.c new file mode 100644 index 000000000..2c6d3e59f --- /dev/null +++ b/package/heirloom-cpio/src/inflate.c @@ -0,0 +1,991 @@ +/* + * Changes by Gunnar Ritter, Freiburg i. Br., Germany, May 2003. + * + * Derived from Info-ZIP 5.50. + * + * Sccsid @(#)inflate.c 1.6 (gritter) 10/13/04 + */ +/* +This is version 2002-Feb-16 of the Info-ZIP copyright and license. +The definitive version of this document should be available at +ftp://ftp.info-zip.org/pub/infozip/license.html indefinitely. + + +Copyright (c) 1990-2002 Info-ZIP. All rights reserved. + +For the purposes of this copyright and license, "Info-ZIP" is defined as +the following set of individuals: + + Mark Adler, John Bush, Karl Davis, Harald Denker, Jean-Michel Dubois, + Jean-loup Gailly, Hunter Goatley, Ian Gorman, Chris Herborth, Dirk Haase, + Greg Hartwig, Robert Heath, Jonathan Hudson, Paul Kienitz, David Kirschbaum, + Johnny Lee, Onno van der Linden, Igor Mandrichenko, Steve P. Miller, + Sergio Monesi, Keith Owens, George Petrov, Greg Roelofs, Kai Uwe Rommel, + Steve Salisbury, Dave Smith, Christian Spieler, Antoine Verheijen, + Paul von Behren, Rich Wales, Mike White + +This software is provided "as is," without warranty of any kind, express +or implied. In no event shall Info-ZIP or its contributors be held liable +for any direct, indirect, incidental, special or consequential damages +arising out of the use of or inability to use this software. + +Permission is granted to anyone to use this software for any purpose, +including commercial applications, and to alter it and redistribute it +freely, subject to the following restrictions: + + 1. Redistributions of source code must retain the above copyright notice, + definition, disclaimer, and this list of conditions. + + 2. Redistributions in binary form (compiled executables) must reproduce + the above copyright notice, definition, disclaimer, and this list of + conditions in documentation and/or other materials provided with the + distribution. The sole exception to this condition is redistribution + of a standard UnZipSFX binary as part of a self-extracting archive; + that is permitted without inclusion of this license, as long as the + normal UnZipSFX banner has not been removed from the binary or disabled. + + 3. Altered versions--including, but not limited to, ports to new operating + systems, existing ports with new graphical interfaces, and dynamic, + shared, or static library versions--must be plainly marked as such + and must not be misrepresented as being the original source. Such + altered versions also must not be misrepresented as being Info-ZIP + releases--including, but not limited to, labeling of the altered + versions with the names "Info-ZIP" (or any variation thereof, including, + but not limited to, different capitalizations), "Pocket UnZip," "WiZ" + or "MacZip" without the explicit permission of Info-ZIP. Such altered + versions are further prohibited from misrepresentative use of the + Zip-Bugs or Info-ZIP e-mail addresses or of the Info-ZIP URL(s). + + 4. Info-ZIP retains the right to use the names "Info-ZIP," "Zip," "UnZip," + "UnZipSFX," "WiZ," "Pocket UnZip," "Pocket Zip," and "MacZip" for its + own source and binary releases. +*/ +/* + Copyright (c) 1990-2002 Info-ZIP. All rights reserved. + + See the accompanying file LICENSE, version 2000-Apr-09 or later + (the contents of which are also included in unzip.h) for terms of use. + If, for some reason, all these files are missing, the Info-ZIP license + also may be found at: ftp://ftp.info-zip.org/pub/infozip/license.html +*/ +/* inflate.c -- by Mark Adler + version c17a, 04 Feb 2001 */ + + +/* Copyright history: + - Starting with UnZip 5.41 of 16-April-2000, this source file + is covered by the Info-Zip LICENSE cited above. + - Prior versions of this source file, found in UnZip source packages + up to UnZip 5.40, were put in the public domain. + The original copyright note by Mark Adler was: + "You can do whatever you like with this source file, + though I would prefer that if you modify it and + redistribute it that you include comments to that effect + with your name and the date. Thank you." + + History: + vers date who what + ---- --------- -------------- ------------------------------------ + a ~~ Feb 92 M. Adler used full (large, one-step) lookup table + b1 21 Mar 92 M. Adler first version with partial lookup tables + b2 21 Mar 92 M. Adler fixed bug in fixed-code blocks + b3 22 Mar 92 M. Adler sped up match copies, cleaned up some + b4 25 Mar 92 M. Adler added prototypes; removed window[] (now + is the responsibility of unzip.h--also + changed name to slide[]), so needs diffs + for unzip.c and unzip.h (this allows + compiling in the small model on MSDOS); + fixed cast of q in huft_build(); + b5 26 Mar 92 M. Adler got rid of unintended macro recursion. + b6 27 Mar 92 M. Adler got rid of nextbyte() routine. fixed + bug in inflate_fixed(). + c1 30 Mar 92 M. Adler removed lbits, dbits environment variables. + changed BMAX to 16 for explode. Removed + OUTB usage, and replaced it with flush()-- + this was a 20% speed improvement! Added + an explode.c (to replace unimplod.c) that + uses the huft routines here. Removed + register union. + c2 4 Apr 92 M. Adler fixed bug for file sizes a multiple of 32k. + c3 10 Apr 92 M. Adler reduced memory of code tables made by + huft_build significantly (factor of two to + three). + c4 15 Apr 92 M. Adler added NOMEMCPY do kill use of memcpy(). + worked around a Turbo C optimization bug. + c5 21 Apr 92 M. Adler added the WSIZE #define to allow reducing + the 32K window size for specialized + applications. + c6 31 May 92 M. Adler added some typecasts to eliminate warnings + c7 27 Jun 92 G. Roelofs added some more typecasts (444: MSC bug). + c8 5 Oct 92 J-l. Gailly added ifdef'd code to deal with PKZIP bug. + c9 9 Oct 92 M. Adler removed a memory error message (~line 416). + c10 17 Oct 92 G. Roelofs changed ULONG/UWORD/byte to ulg/ush/uch, + removed old inflate, renamed inflate_entry + to inflate, added Mark's fix to a comment. + c10.5 14 Dec 92 M. Adler fix up error messages for incomplete trees. + c11 2 Jan 93 M. Adler fixed bug in detection of incomplete + tables, and removed assumption that EOB is + the longest code (bad assumption). + c12 3 Jan 93 M. Adler make tables for fixed blocks only once. + c13 5 Jan 93 M. Adler allow all zero length codes (pkzip 2.04c + outputs one zero length code for an empty + distance tree). + c14 12 Mar 93 M. Adler made inflate.c standalone with the + introduction of inflate.h. + c14b 16 Jul 93 G. Roelofs added (unsigned) typecast to w at 470. + c14c 19 Jul 93 J. Bush changed v[N_MAX], l[288], ll[28x+3x] arrays + to static for Amiga. + c14d 13 Aug 93 J-l. Gailly de-complicatified Mark's c[*p++]++ thing. + c14e 8 Oct 93 G. Roelofs changed memset() to memzero(). + c14f 22 Oct 93 G. Roelofs renamed quietflg to qflag; made Trace() + conditional; added inflate_free(). + c14g 28 Oct 93 G. Roelofs changed l/(lx+1) macro to pointer (Cray bug) + c14h 7 Dec 93 C. Ghisler huft_build() optimizations. + c14i 9 Jan 94 A. Verheijen set fixed_t{d,l} to NULL after freeing; + G. Roelofs check NEXTBYTE macro for EOF. + c14j 23 Jan 94 G. Roelofs removed Ghisler "optimizations"; ifdef'd + EOF check. + c14k 27 Feb 94 G. Roelofs added some typecasts to avoid warnings. + c14l 9 Apr 94 G. Roelofs fixed split comments on preprocessor lines + to avoid bug in Encore compiler. + c14m 7 Jul 94 P. Kienitz modified to allow assembler version of + inflate_codes() (define ASM_INFLATECODES) + c14n 22 Jul 94 G. Roelofs changed fprintf to macro for DLL versions + c14o 23 Aug 94 C. Spieler added a newline to a debug statement; + G. Roelofs added another typecast to avoid MSC warning + c14p 4 Oct 94 G. Roelofs added (voidp *) cast to free() argument + c14q 30 Oct 94 G. Roelofs changed fprintf macro to MESSAGE() + c14r 1 Nov 94 G. Roelofs fixed possible redefinition of CHECK_EOF + c14s 7 May 95 S. Maxwell OS/2 DLL globals stuff incorporated; + P. Kienitz "fixed" ASM_INFLATECODES macro/prototype + c14t 18 Aug 95 G. Roelofs added UZinflate() to use zlib functions; + changed voidp to zvoid; moved huft_build() + and huft_free() to end of file + c14u 1 Oct 95 G. Roelofs moved G into definition of MESSAGE macro + c14v 8 Nov 95 P. Kienitz changed ASM_INFLATECODES to use a regular + call with __G__ instead of a macro + c15 3 Aug 96 M. Adler fixed bomb-bug on random input data (Adobe) + c15b 24 Aug 96 M. Adler more fixes for random input data + c15c 28 Mar 97 G. Roelofs changed USE_ZLIB fatal exit code from + PK_MEM2 to PK_MEM3 + c16 20 Apr 97 J. Altman added memzero(v[]) in huft_build() + c16b 29 Mar 98 C. Spieler modified DLL code for slide redirection + c16c 04 Apr 99 C. Spieler fixed memory leaks when processing gets + stopped because of input data errors + c16d 05 Jul 99 C. Spieler take care of FLUSH() return values and + stop processing in case of errors + c17 31 Dec 00 C. Spieler added preliminary support for Deflate64 + c17a 04 Feb 01 C. Spieler complete integration of Deflate64 support + c17b 16 Feb 02 C. Spieler changed type of "extra bits" arrays and + corresponding huft_buid() parameter e from + ush into uch, to save space + */ + + +/* + Inflate deflated (PKZIP's method 8 compressed) data. The compression + method searches for as much of the current string of bytes (up to a + length of 258) in the previous 32K bytes. If it doesn't find any + matches (of at least length 3), it codes the next byte. Otherwise, it + codes the length of the matched string and its distance backwards from + the current position. There is a single Huffman code that codes both + single bytes (called "literals") and match lengths. A second Huffman + code codes the distance information, which follows a length code. Each + length or distance code actually represents a base value and a number + of "extra" (sometimes zero) bits to get to add to the base value. At + the end of each deflated block is a special end-of-block (EOB) literal/ + length code. The decoding process is basically: get a literal/length + code; if EOB then done; if a literal, emit the decoded byte; if a + length then get the distance and emit the referred-to bytes from the + sliding window of previously emitted data. + + There are (currently) three kinds of inflate blocks: stored, fixed, and + dynamic. The compressor outputs a chunk of data at a time and decides + which method to use on a chunk-by-chunk basis. A chunk might typically + be 32K to 64K, uncompressed. If the chunk is uncompressible, then the + "stored" method is used. In this case, the bytes are simply stored as + is, eight bits per byte, with none of the above coding. The bytes are + preceded by a count, since there is no longer an EOB code. + + If the data are compressible, then either the fixed or dynamic methods + are used. In the dynamic method, the compressed data are preceded by + an encoding of the literal/length and distance Huffman codes that are + to be used to decode this block. The representation is itself Huffman + coded, and so is preceded by a description of that code. These code + descriptions take up a little space, and so for small blocks, there is + a predefined set of codes, called the fixed codes. The fixed method is + used if the block ends up smaller that way (usually for quite small + chunks); otherwise the dynamic method is used. In the latter case, the + codes are customized to the probabilities in the current block and so + can code it much better than the pre-determined fixed codes can. + + The Huffman codes themselves are decoded using a multi-level table + lookup, in order to maximize the speed of decoding plus the speed of + building the decoding tables. See the comments below that precede the + lbits and dbits tuning parameters. + + GRR: return values(?) + 0 OK + 1 incomplete table + 2 bad input + 3 not enough memory + the following return codes are passed through from FLUSH() errors + 50 (PK_DISK) "overflow of output space" + 80 (IZ_CTRLC) "canceled by user's request" + */ + + +/* + Notes beyond the 1.93a appnote.txt: + + 1. Distance pointers never point before the beginning of the output + stream. + 2. Distance pointers can point back across blocks, up to 32k away. + 3. There is an implied maximum of 7 bits for the bit length table and + 15 bits for the actual data. + 4. If only one code exists, then it is encoded using one bit. (Zero + would be more efficient, but perhaps a little confusing.) If two + codes exist, they are coded using one bit each (0 and 1). + 5. There is no way of sending zero distance codes--a dummy must be + sent if there are none. (History: a pre 2.0 version of PKZIP would + store blocks with no distance codes, but this was discovered to be + too harsh a criterion.) Valid only for 1.93a. 2.04c does allow + zero distance codes, which is sent as one code of zero bits in + length. + 6. There are up to 286 literal/length codes. Code 256 represents the + end-of-block. Note however that the static length tree defines + 288 codes just to fill out the Huffman codes. Codes 286 and 287 + cannot be used though, since there is no length base or extra bits + defined for them. Similarily, there are up to 30 distance codes. + However, static trees define 32 codes (all 5 bits) to fill out the + Huffman codes, but the last two had better not show up in the data. + 7. Unzip can check dynamic Huffman blocks for complete code sets. + The exception is that a single code would not be complete (see #4). + 8. The five bits following the block type is really the number of + literal codes sent minus 257. + 9. Length codes 8,16,16 are interpreted as 13 length codes of 8 bits + (1+6+6). Therefore, to output three times the length, you output + three codes (1+1+1), whereas to output four times the same length, + you only need two codes (1+3). Hmm. + 10. In the tree reconstruction algorithm, Code = Code + Increment + only if BitLength(i) is not zero. (Pretty obvious.) + 11. Correction: 4 Bits: # of Bit Length codes - 4 (4 - 19) + 12. Note: length code 284 can represent 227-258, but length code 285 + really is 258. The last length deserves its own, short code + since it gets used a lot in very redundant files. The length + 258 is special since 258 - 3 (the min match length) is 255. + 13. The literal/length and distance code bit lengths are read as a + single stream of lengths. It is possible (and advantageous) for + a repeat code (16, 17, or 18) to go across the boundary between + the two sets of lengths. + 14. The Deflate64 (PKZIP method 9) variant of the compression algorithm + differs from "classic" deflate in the following 3 aspect: + a) The size of the sliding history window is expanded to 64 kByte. + b) The previously unused distance codes #30 and #31 code distances + from 32769 to 49152 and 49153 to 65536. Both codes take 14 bits + of extra data to determine the exact position in their 16 kByte + range. + c) The last lit/length code #285 gets a different meaning. Instead + of coding a fixed maximum match length of 258, it is used as a + "generic" match length code, capable of coding any length from + 3 (min match length + 0) to 65538 (min match length + 65535). + This means that the length code #285 takes 16 bits (!) of uncoded + extra data, added to a fixed min length of 3. + Changes a) and b) would have been transparent for valid deflated + data, but change c) requires to switch decoder configurations between + Deflate and Deflate64 modes. + */ + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include "cpio.h" +#include "unzip.h" + +/* + inflate.h must supply the uch slide[WSIZE] array, the zvoid typedef + (void if (void *) is accepted, else char) and the NEXTBYTE, + FLUSH() and memzero macros. If the window size is not 32K, it + should also define WSIZE. If INFMOD is defined, it can include + compiled functions to support the NEXTBYTE and/or FLUSH() macros. + There are defaults for NEXTBYTE and FLUSH() below for use as + examples of what those functions need to do. Normally, you would + also want FLUSH() to compute a crc on the data. inflate.h also + needs to provide these typedefs: + + typedef unsigned char uch; + typedef unsigned short ush; + typedef unsigned long ulg; + + This module uses the external functions malloc() and free() (and + probably memset() or bzero() in the memzero() macro). Their + prototypes are normally found in <string.h> and <stdlib.h>. + */ + +/* marker for "unused" huft code, and corresponding check macro */ +#define INVALID_CODE 99 +#define IS_INVALID_CODE(c) ((c) == INVALID_CODE) + +static int inflate_codes(struct globals *Gp, + struct huft *tl, struct huft *td, + int bl, int bd); +static int inflate_stored(struct globals *Gp); +static int inflate_fixed(struct globals *Gp); +static int inflate_dynamic(struct globals *Gp); +static int inflate_block(struct globals *Gp, int *e); + +#define FLUSH(n) (flush(&G, redirSlide, (n)), 0) + +/* The inflate algorithm uses a sliding 32K byte window on the uncompressed + stream to find repeated byte strings. This is implemented here as a + circular buffer. The index is updated simply by incrementing and then + and'ing with 0x7fff (32K-1). */ +/* It is left to other modules to supply the 32K area. It is assumed + to be usable as if it were declared "uch slide[32768];" or as just + "uch *slide;" and then malloc'ed in the latter case. The definition + must be in unzip.h, included above. */ + + +/* Tables for deflate from PKZIP's appnote.txt. */ +/* - Order of the bit length code lengths */ +static const unsigned border[] = { + 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15}; + +/* - Copy lengths for literal codes 257..285 */ +static const uint16_t cplens64[] = { + 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, + 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 3, 0, 0}; + /* For Deflate64, the code 285 is defined differently. */ +static const uint16_t cplens32[] = { + 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, + 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0}; + /* note: see note #13 above about the 258 in this list. */ +/* - Extra bits for literal codes 257..285 */ +static const uint8_t cplext64[] = { + 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, + 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 16, INVALID_CODE, INVALID_CODE}; +static const uint8_t cplext32[] = { + 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, + 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, INVALID_CODE, INVALID_CODE}; + +/* - Copy offsets for distance codes 0..29 (0..31 for Deflate64) */ +static const uint16_t cpdist[] = { + 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, + 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, + 8193, 12289, 16385, 24577, 32769, 49153}; + +/* - Extra bits for distance codes 0..29 (0..31 for Deflate64) */ +static const uint8_t cpdext64[] = { + 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, + 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, + 12, 12, 13, 13, 14, 14}; +static const uint8_t cpdext32[] = { + 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, + 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, + 12, 12, 13, 13, INVALID_CODE, INVALID_CODE}; + +# define MAXLITLENS 288 +# define MAXDISTS 32 + +/* Macros for inflate() bit peeking and grabbing. + The usage is: + + NEEDBITS(j) + x = b & mask_bits[j]; + DUMPBITS(j) + + where NEEDBITS makes sure that b has at least j bits in it, and + DUMPBITS removes the bits from b. The macros use the variable k + for the number of bits in b. Normally, b and k are register + variables for speed and are initialized at the begining of a + routine that uses these macros from a global bit buffer and count. + + In order to not ask for more bits than there are in the compressed + stream, the Huffman tables are constructed to only ask for just + enough bits to make up the end-of-block code (value 256). Then no + bytes need to be "returned" to the buffer at the end of the last + block. See the huft_build() routine. + */ + +# define NEEDBITS(n) {while(k<(n)){int c=NEXTBYTE;\ + if(c==EOF){retval=1;goto cleanup_and_exit;}\ + b|=((uint32_t)c)<<k;k+=8;}} + +#define DUMPBITS(n) {b>>=(n);k-=(n);} + +#define Bits 32 +#define Nob 32 +#define Eob 31 + +/* + Huffman code decoding is performed using a multi-level table lookup. + The fastest way to decode is to simply build a lookup table whose + size is determined by the longest code. However, the time it takes + to build this table can also be a factor if the data being decoded + are not very long. The most common codes are necessarily the + shortest codes, so those codes dominate the decoding time, and hence + the speed. The idea is you can have a shorter table that decodes the + shorter, more probable codes, and then point to subsidiary tables for + the longer codes. The time it costs to decode the longer codes is + then traded against the time it takes to make longer tables. + + This results of this trade are in the variables lbits and dbits + below. lbits is the number of bits the first level table for literal/ + length codes can decode in one step, and dbits is the same thing for + the distance codes. Subsequent tables are also less than or equal to + those sizes. These values may be adjusted either when all of the + codes are shorter than that, in which case the longest code length in + bits is used, or when the shortest code is *longer* than the requested + table size, in which case the length of the shortest code in bits is + used. + + There are two different values for the two tables, since they code a + different number of possibilities each. The literal/length table + codes 286 possible values, or in a flat code, a little over eight + bits. The distance table codes 30 possible values, or a little less + than five bits, flat. The optimum values for speed end up being + about one bit more than those, so lbits is 8+1 and dbits is 5+1. + The optimum values may differ though from machine to machine, and + possibly even between compilers. Your mileage may vary. + */ + + +static const int lbits = 9; /* bits in base literal/length lookup table */ +static const int dbits = 6; /* bits in base distance lookup table */ + +#define G (*Gp) + +static int +inflate_codes(struct globals *Gp, + struct huft *tl, struct huft *td, int bl, int bd) +/*struct huft *tl, *td;*/ /* literal/length and distance decoder tables */ +/*int bl, bd;*/ /* number of bits decoded by tl[] and td[] */ +/* inflate (decompress) the codes in a deflated (compressed) block. + Return an error code or zero if it all goes ok. */ +{ + register unsigned e; /* table entry flag/number of extra bits */ + unsigned d; /* index for copy */ + uint32_t n; /* length for copy (deflate64: might be 64k+2) */ + uint32_t w; /* current window position (deflate64: up to 64k) */ + struct huft *t; /* pointer to table entry */ + unsigned ml, md; /* masks for bl and bd bits */ + register uint32_t b; /* bit buffer */ + register unsigned k; /* number of bits in bit buffer */ + int retval = 0; /* error code returned: initialized to "no error" */ + + + /* make local copies of globals */ + b = G.bb; /* initialize bit buffer */ + k = G.bk; + w = G.wp; /* initialize window position */ + + + /* inflate the coded data */ + ml = mask_bits[bl]; /* precompute masks for speed */ + md = mask_bits[bd]; + while (1) /* do until end of block */ + { + NEEDBITS((unsigned)bl) + t = tl + ((unsigned)b & ml); + while (1) { + DUMPBITS(t->b) + + if ((e = t->e) == 32) /* then it's a literal */ + { + redirSlide[w++] = (uint8_t)t->v.n; + if (w == WSIZE) + { + if ((retval = FLUSH(w)) != 0) goto cleanup_and_exit; + w = 0; + } + break; + } + + if (e < 31) /* then it's a length */ + { + /* get length of block to copy */ + NEEDBITS(e) + n = t->v.n + ((unsigned)b & mask_bits[e]); + DUMPBITS(e) + + /* decode distance of block to copy */ + NEEDBITS((unsigned)bd) + t = td + ((unsigned)b & md); + while (1) { + DUMPBITS(t->b) + if ((e = t->e) < 32) + break; + if (IS_INVALID_CODE(e)) + return 1; + e &= 31; + NEEDBITS(e) + t = t->v.t + ((unsigned)b & mask_bits[e]); + } + NEEDBITS(e) + d = (unsigned)w - t->v.n - ((unsigned)b & mask_bits[e]); + DUMPBITS(e) + + /* do the copy */ + do { + e = (unsigned)(WSIZE - + ((d &= (unsigned)(WSIZE-1)) > (unsigned)w ? + (uint32_t)d : w)); + if ((uint32_t)e > n) e = (unsigned)n; + n -= e; +#ifndef NOMEMCPY + if ((unsigned)w - d >= e) + /* (this test assumes unsigned comparison) */ + { + memcpy(redirSlide + (unsigned)w, redirSlide + d, e); + w += e; + d += e; + } + else /* do it slowly to avoid memcpy() overlap */ +#endif /* !NOMEMCPY */ + do { + redirSlide[w++] = redirSlide[d++]; + } while (--e); + if (w == WSIZE) + { + if ((retval = FLUSH(w)) != 0) goto cleanup_and_exit; + w = 0; + } + } while (n); + break; + } + + if (e == 31) /* it's the EOB signal */ + { + /* sorry for this goto, but we have to exit two loops at once */ + goto cleanup_decode; + } + + if (IS_INVALID_CODE(e)) + return 1; + + e &= 31; + NEEDBITS(e) + t = t->v.t + ((unsigned)b & mask_bits[e]); + } + } +cleanup_decode: + + /* restore the globals from the locals */ + G.wp = (unsigned)w; /* restore global window pointer */ + G.bb = b; /* restore global bit buffer */ + G.bk = k; + + +cleanup_and_exit: + /* done */ + return retval; +} + +static int +inflate_stored(struct globals *Gp) +/* "decompress" an inflated type 0 (stored) block. */ +{ + uint32_t w; /* current window position (deflate64: up to 64k!) */ + unsigned n; /* number of bytes in block */ + register uint32_t b; /* bit buffer */ + register unsigned k; /* number of bits in bit buffer */ + int retval = 0; /* error code returned: initialized to "no error" */ + + + /* make local copies of globals */ + Trace((stderr, "\nstored block")); + b = G.bb; /* initialize bit buffer */ + k = G.bk; + w = G.wp; /* initialize window position */ + + + /* go to byte boundary */ + n = k & 7; + DUMPBITS(n); + + + /* get the length and its complement */ + NEEDBITS(16) + n = ((unsigned)b & 0xffff); + DUMPBITS(16) + NEEDBITS(16) + if (n != (unsigned)((~b) & 0xffff)) + return 1; /* error in compressed data */ + DUMPBITS(16) + + + /* read and output the compressed data */ + while (n--) + { + NEEDBITS(8) + redirSlide[w++] = (uint8_t)b; + if (w == WSIZE) + { + if ((retval = FLUSH(w)) != 0) goto cleanup_and_exit; + w = 0; + } + DUMPBITS(8) + } + + + /* restore the globals from the locals */ + G.wp = (unsigned)w; /* restore global window pointer */ + G.bb = b; /* restore global bit buffer */ + G.bk = k; + +cleanup_and_exit: + return retval; +} + + +static int +inflate_fixed(struct globals *Gp) +/* decompress an inflated type 1 (fixed Huffman codes) block. We should + either replace this with a custom decoder, or at least precompute the + Huffman tables. */ +{ + /* if first time, set up tables for fixed blocks */ + Trace((stderr, "\nliteral block")); + if (G.fixed_tl == NULL) + { + int i; /* temporary variable */ + unsigned l[288]; /* length list for huft_build */ + + /* literal table */ + for (i = 0; i < 144; i++) + l[i] = 8; + for (; i < 256; i++) + l[i] = 9; + for (; i < 280; i++) + l[i] = 7; + for (; i < 288; i++) /* make a complete, but wrong code set */ + l[i] = 8; + G.fixed_bl = 7; + if ((i = huft_build(l, 288, 257, G.cplens, G.cplext, + &G.fixed_tl, &G.fixed_bl, + Bits, Nob, Eob)) != 0) + { + G.fixed_tl = NULL; + return i; + } + + /* distance table */ + for (i = 0; i < MAXDISTS; i++) /* make an incomplete code set */ + l[i] = 5; + G.fixed_bd = 5; + if ((i = huft_build(l, MAXDISTS, 0, cpdist, G.cpdext, + &G.fixed_td, &G.fixed_bd, + Bits, Nob, Eob)) > 1) + { + huft_free(G.fixed_tl); + G.fixed_td = G.fixed_tl = NULL; + return i; + } + } + + /* decompress until an end-of-block code */ + return inflate_codes(&G, G.fixed_tl, G.fixed_td, + G.fixed_bl, G.fixed_bd); +} + + + +static int inflate_dynamic(struct globals *Gp) +/* decompress an inflated type 2 (dynamic Huffman codes) block. */ +{ + int i; /* temporary variables */ + unsigned j; + unsigned l; /* last length */ + unsigned m; /* mask for bit lengths table */ + unsigned n; /* number of lengths to get */ + struct huft *tl; /* literal/length code table */ + struct huft *td; /* distance code table */ + int bl; /* lookup bits for tl */ + int bd; /* lookup bits for td */ + unsigned nb; /* number of bit length codes */ + unsigned nl; /* number of literal/length codes */ + unsigned nd; /* number of distance codes */ + unsigned ll[MAXLITLENS+MAXDISTS]; /* lit./length and distance code lengths */ + register uint32_t b; /* bit buffer */ + register unsigned k; /* number of bits in bit buffer */ + int retval = 0; /* error code returned: initialized to "no error" */ + + + /* make local bit buffer */ + Trace((stderr, "\ndynamic block")); + b = G.bb; + k = G.bk; + + + /* read in table lengths */ + NEEDBITS(5) + nl = 257 + ((unsigned)b & 0x1f); /* number of literal/length codes */ + DUMPBITS(5) + NEEDBITS(5) + nd = 1 + ((unsigned)b & 0x1f); /* number of distance codes */ + DUMPBITS(5) + NEEDBITS(4) + nb = 4 + ((unsigned)b & 0xf); /* number of bit length codes */ + DUMPBITS(4) + if (nl > MAXLITLENS || nd > MAXDISTS) + return 1; /* bad lengths */ + + + /* read in bit-length-code lengths */ + for (j = 0; j < nb; j++) + { + NEEDBITS(3) + ll[border[j]] = (unsigned)b & 7; + DUMPBITS(3) + } + for (; j < 19; j++) + ll[border[j]] = 0; + + + /* build decoding table for trees--single level, 7 bit lookup */ + bl = 7; + retval = huft_build(ll, 19, 19, NULL, NULL, &tl, &bl, + Bits, Nob, Eob); + if (bl == 0) /* no bit lengths */ + retval = 1; + if (retval) + { + if (retval == 1) + huft_free(tl); + return retval; /* incomplete code set */ + } + + + /* read in literal and distance code lengths */ + n = nl + nd; + m = mask_bits[bl]; + i = l = 0; + while ((unsigned)i < n) + { + NEEDBITS((unsigned)bl) + j = (td = tl + ((unsigned)b & m))->b; + DUMPBITS(j) + j = td->v.n; + if (j < 16) /* length of code in bits (0..15) */ + ll[i++] = l = j; /* save last length in l */ + else if (j == 16) /* repeat last length 3 to 6 times */ + { + NEEDBITS(2) + j = 3 + ((unsigned)b & 3); + DUMPBITS(2) + if ((unsigned)i + j > n) + return 1; + while (j--) + ll[i++] = l; + } + else if (j == 17) /* 3 to 10 zero length codes */ + { + NEEDBITS(3) + j = 3 + ((unsigned)b & 7); + DUMPBITS(3) + if ((unsigned)i + j > n) + return 1; + while (j--) + ll[i++] = 0; + l = 0; + } + else /* j == 18: 11 to 138 zero length codes */ + { + NEEDBITS(7) + j = 11 + ((unsigned)b & 0x7f); + DUMPBITS(7) + if ((unsigned)i + j > n) + return 1; + while (j--) + ll[i++] = 0; + l = 0; + } + } + + + /* free decoding table for trees */ + huft_free(tl); + + + /* restore the global bit buffer */ + G.bb = b; + G.bk = k; + + + /* build the decoding tables for literal/length and distance codes */ + bl = lbits; + retval = huft_build(ll, nl, 257, G.cplens, G.cplext, &tl, &bl, + Bits, Nob, Eob); + if (bl == 0) /* no literals or lengths */ + retval = 1; + if (retval) + { + if (retval == 1) { + /*if (!uO.qflag) + MESSAGE((uint8_t *)"(incomplete l-tree) ", 21L, 1);*/ + huft_free(tl); + } + return retval; /* incomplete code set */ + } + bd = dbits; + retval = huft_build(ll + nl, nd, 0, cpdist, G.cpdext, &td, &bd, + Bits, Nob, Eob); + if (retval == 1) + retval = 0; + if (bd == 0 && nl > 257) /* lengths but no distances */ + retval = 1; + if (retval) + { + if (retval == 1) { + /*if (!uO.qflag) + MESSAGE((uint8_t *)"(incomplete d-tree) ", 21L, 1);*/ + huft_free(td); + } + huft_free(tl); + return retval; + } + + /* decompress until an end-of-block code */ + retval = inflate_codes(&G, tl, td, bl, bd); + +cleanup_and_exit: + /* free the decoding tables, return */ + huft_free(tl); + huft_free(td); + return retval; +} + + + +static int inflate_block(struct globals *Gp, int *e) +/*int *e;*/ /* last block flag */ +/* decompress an inflated block */ +{ + unsigned t; /* block type */ + register uint32_t b; /* bit buffer */ + register unsigned k; /* number of bits in bit buffer */ + int retval = 0; /* error code returned: initialized to "no error" */ + + + /* make local bit buffer */ + b = G.bb; + k = G.bk; + + + /* read in last block bit */ + NEEDBITS(1) + *e = (int)b & 1; + DUMPBITS(1) + + + /* read in block type */ + NEEDBITS(2) + t = (unsigned)b & 3; + DUMPBITS(2) + + + /* restore the global bit buffer */ + G.bb = b; + G.bk = k; + + + /* inflate that block type */ + if (t == 2) + return inflate_dynamic(&G); + if (t == 0) + return inflate_stored(&G); + if (t == 1) + return inflate_fixed(&G); + + + /* bad block type */ + retval = 2; + +cleanup_and_exit: + return retval; +} + +#undef G + +int +zipinflate(struct file *f, const char *tgt, int tfd, int doswap, uint32_t *crc) +/* decompress an inflated entry */ +{ + struct globals G; + int e = 0; /* last block flag */ + int r; /* result code */ + int is_defl64; +#ifdef DEBUG + unsigned h = 0; /* maximum struct huft's malloc'ed */ +#endif + + is_defl64 = f->f_cmethod == C_ENHDEFLD; + memset(&G, 0, sizeof G); + G.tgt = tgt; + G.tfd = tfd; + G.doswap = doswap; + G.crc = crc; + G.zsize = G.uzsize = f->f_csize; + G.ucsize = f->f_st.st_size; + /* initialize window, bit buffer */ + G.wp = 0; + G.bk = 0; + G.bb = 0; + + if (is_defl64) { + G.cplens = cplens64; + G.cplext = cplext64; + G.cpdext = cpdext64; + G.fixed_tl = G.fixed_tl64; + G.fixed_bl = G.fixed_bl64; + G.fixed_td = G.fixed_td64; + G.fixed_bd = G.fixed_bd64; + } else { + G.cplens = cplens32; + G.cplext = cplext32; + G.cpdext = cpdext32; + G.fixed_tl = G.fixed_tl32; + G.fixed_bl = G.fixed_bl32; + G.fixed_td = G.fixed_td32; + G.fixed_bd = G.fixed_bd32; + } + + /* decompress until the last block */ + do { +#ifdef DEBUG + G.hufts = 0; +#endif + if ((r = inflate_block(&G, &e)) != 0) { + if ((f->f_gflag & FG_DESC) == 0) + while (G.uzsize > 0) + NEXTBYTE; + msg(3, 0, "compression error on \"%s\"\n", f->f_name); + return -1; + } +#ifdef DEBUG + if (G.hufts > h) + h = G.hufts; +#endif + } while (!e); + + Trace((stderr, "\n%u bytes in Huffman tables (%u/entry)\n", + h * (unsigned)sizeof(struct huft), (unsigned)sizeof(struct huft))); + + if (is_defl64) { + G.fixed_tl64 = G.fixed_tl; + G.fixed_bl64 = G.fixed_bl; + G.fixed_td64 = G.fixed_td; + G.fixed_bd64 = G.fixed_bd; + } else { + G.fixed_tl32 = G.fixed_tl; + G.fixed_bl32 = G.fixed_bl; + G.fixed_td32 = G.fixed_td; + G.fixed_bd32 = G.fixed_bd; + } + + /* flush out redirSlide and return (success, unless final FLUSH failed) */ + (FLUSH(G.wp)); + if (f->f_gflag & FG_DESC) + bunread((char *)G.inptr, G.incnt); + return G.status; +} |