X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=archival%2Fgzip.c;h=403eb4dcb4eeabbd982cc0f44e4e7c28274ea3bd;hb=0d0260fd1e55c39525660370094d090bc5412fe5;hp=034bda005aca3ff83a4f4554195948e790ac6bb2;hpb=56c83eaaf5c9245b46b7dc0606faba2e53f90737;p=oweals%2Fbusybox.git diff --git a/archival/gzip.c b/archival/gzip.c index 034bda005..403eb4dcb 100644 --- a/archival/gzip.c +++ b/archival/gzip.c @@ -5,27 +5,57 @@ * Based on GNU gzip Copyright (C) 1992-1993 Jean-loup Gailly. * * Originally adjusted for busybox by Charles P. Wright - * "this is a stripped down version of gzip I put into busybox, it does - * only standard in to standard out with -9 compression. It also requires - * the zcat module for some important functions." + * "this is a stripped down version of gzip I put into busybox, it does + * only standard in to standard out with -9 compression. It also requires + * the zcat module for some important functions." * * Adjusted further by Erik Andersen to support * files as well as stdin/stdout, and to generally behave itself wrt * command line handling. * - * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. + * Licensed under GPLv2 or later, see file LICENSE in this source tree. + */ + +/* big objects in bss: + * 00000020 b bl_count + * 00000074 b base_length + * 00000078 b base_dist + * 00000078 b static_dtree + * 0000009c b bl_tree + * 000000f4 b dyn_dtree + * 00000100 b length_code + * 00000200 b dist_code + * 0000023d b depth + * 00000400 b flag_buf + * 0000047a b heap + * 00000480 b static_ltree + * 000008f4 b dyn_ltree */ /* TODO: full support for -v for DESKTOP -/usr/bin/gzip -v a bogus aa + * "/usr/bin/gzip -v a bogus aa" should say: a: 85.1% -- replaced with a.gz gzip: bogus: No such file or directory aa: 85.1% -- replaced with aa.gz */ - -//#include -#include "busybox.h" +//usage:#define gzip_trivial_usage +//usage: "[-cfd] [FILE]..." +//usage:#define gzip_full_usage "\n\n" +//usage: "Compress FILEs (or stdin)\n" +//usage: "\n -d Decompress" +//usage: "\n -c Write to stdout" +//usage: "\n -f Force" +//usage: +//usage:#define gzip_example_usage +//usage: "$ ls -la /tmp/busybox*\n" +//usage: "-rw-rw-r-- 1 andersen andersen 1761280 Apr 14 17:47 /tmp/busybox.tar\n" +//usage: "$ gzip /tmp/busybox.tar\n" +//usage: "$ ls -la /tmp/busybox*\n" +//usage: "-rw-rw-r-- 1 andersen andersen 554058 Apr 14 17:49 /tmp/busybox.tar.gz\n" + +#include "libbb.h" +#include "archive.h" /* =========================================================================== @@ -33,12 +63,12 @@ aa: 85.1% -- replaced with aa.gz //#define DEBUG 1 /* Diagnostic functions */ #ifdef DEBUG -# define Assert(cond,msg) {if(!(cond)) bb_error_msg(msg);} +# define Assert(cond,msg) { if (!(cond)) bb_error_msg(msg); } # define Trace(x) fprintf x -# define Tracev(x) {if (verbose) fprintf x ;} -# define Tracevv(x) {if (verbose > 1) fprintf x ;} -# define Tracec(c,x) {if (verbose && (c)) fprintf x ;} -# define Tracecv(c,x) {if (verbose > 1 && (c)) fprintf x ;} +# define Tracev(x) {if (verbose) fprintf x; } +# define Tracevv(x) {if (verbose > 1) fprintf x; } +# define Tracec(c,x) {if (verbose && (c)) fprintf x; } +# define Tracecv(c,x) {if (verbose > 1 && (c)) fprintf x; } #else # define Assert(cond,msg) # define Trace(x) @@ -53,13 +83,7 @@ aa: 85.1% -- replaced with aa.gz */ #define SMALL_MEM -/* Compression methods (see algorithm.doc) */ -/* Only STORED and DEFLATED are supported by this BusyBox module */ -#define STORED 0 -/* methods 4 to 7 reserved */ -#define DEFLATED 8 - -#ifndef INBUFSIZ +#ifndef INBUFSIZ # ifdef SMALL_MEM # define INBUFSIZ 0x2000 /* input buffer size */ # else @@ -67,18 +91,13 @@ aa: 85.1% -- replaced with aa.gz # endif #endif -//remove?? -#define INBUF_EXTRA 64 /* required by unlzw() */ - -#ifndef OUTBUFSIZ +#ifndef OUTBUFSIZ # ifdef SMALL_MEM # define OUTBUFSIZ 8192 /* output buffer size */ # else # define OUTBUFSIZ 16384 /* output buffer size */ # endif #endif -//remove?? -#define OUTBUF_EXTRA 2048 /* required by unlzw() */ #ifndef DIST_BUFSIZE # ifdef SMALL_MEM @@ -179,60 +198,19 @@ aa: 85.1% -- replaced with aa.gz /* =========================================================================== + * These types are not really 'char', 'short' and 'long' */ -typedef unsigned char uch; -typedef unsigned short ush; -typedef unsigned long ulg; - +typedef uint8_t uch; +typedef uint16_t ush; +typedef uint32_t ulg; +typedef int32_t lng; -/* =========================================================================== - * Local data used by the "longest match" routines. - */ typedef ush Pos; typedef unsigned IPos; - /* A Pos is an index in the character window. We use short instead of int to * save space in the various tables. IPos is used only for parameter passing. */ -#define DECLARE(type, array, size)\ - static type * array -#define ALLOC(type, array, size) { \ - array = xzalloc((size_t)(((size)+1L)/2) * 2*sizeof(type)); \ -} - -#define FREE(array) \ -{ \ - free(array); \ - array = NULL; \ -} - -static long block_start; - -/* window position at the beginning of the current output block. Gets - * negative when the window is moved backwards. - */ - -static unsigned ins_h; /* hash index of string to be inserted */ - -#define H_SHIFT ((HASH_BITS+MIN_MATCH-1)/MIN_MATCH) -/* Number of bits by which ins_h and del_h must be shifted at each - * input step. It must be such that after MIN_MATCH steps, the oldest - * byte no longer takes part in the hash key, that is: - * H_SHIFT * MIN_MATCH >= HASH_BITS - */ - -static unsigned int prev_length; - -/* Length of the best match at previous step. Matches not greater than this - * are discarded. This is used in the lazy match evaluation. - */ - -static unsigned strstart; /* start of string to insert */ -static unsigned match_start; /* start of matching string */ -static int eofile; /* flag set at end of input file */ -static unsigned lookahead; /* number of valid bytes ahead in window */ - enum { WINDOW_SIZE = 2 * WSIZE, /* window size, 2*WSIZE except for MMAP or BIG_MEM, where it is the @@ -265,7 +243,7 @@ enum { * found for specific files. */ - nice_match = 258 /* Stop searching when current match exceeds this */ + nice_match = 258, /* Stop searching when current match exceeds this */ /* Note: the deflate() code requires max_lazy >= MIN_MATCH and max_chain >= 4 * For deflate_fast() (levels <= 3) good is ignored and lazy has a different * meaning. @@ -273,31 +251,50 @@ enum { }; -/* global buffers */ +struct globals { + + lng block_start; + +/* window position at the beginning of the current output block. Gets + * negative when the window is moved backwards. + */ + unsigned ins_h; /* hash index of string to be inserted */ + +#define H_SHIFT ((HASH_BITS+MIN_MATCH-1) / MIN_MATCH) +/* Number of bits by which ins_h and del_h must be shifted at each + * input step. It must be such that after MIN_MATCH steps, the oldest + * byte no longer takes part in the hash key, that is: + * H_SHIFT * MIN_MATCH >= HASH_BITS + */ + + unsigned prev_length; -/* To save memory for 16 bit systems, some arrays are overlaid between - * the various modules: - * deflate: prev+head window d_buf l_buf outbuf - * unlzw: tab_prefix tab_suffix stack inbuf outbuf -//remove unlzw?? - * For compression, input is done in window[]. For decompression, output - * is done in window except for unlzw. +/* Length of the best match at previous step. Matches not greater than this + * are discarded. This is used in the lazy match evaluation. */ -/* To save space (see unlzw.c), we overlay prev+head with tab_prefix and - * window with tab_suffix. Check that we can do this: + + unsigned strstart; /* start of string to insert */ + unsigned match_start; /* start of matching string */ + unsigned lookahead; /* number of valid bytes ahead in window */ + +/* =========================================================================== */ -#if (WSIZE<<1) > (1< BITS-1 -# error cannot overlay head with tab_prefix1 -#endif +#define DECLARE(type, array, size) \ + type * array +#define ALLOC(type, array, size) \ + array = xzalloc((size_t)(((size)+1L)/2) * 2*sizeof(type)) +#define FREE(array) \ + do { free(array); array = NULL; } while (0) -//#define tab_suffix window -//#define tab_prefix prev /* hash link (see deflate.c) */ -#define head (prev+WSIZE) /* hash head (see deflate.c) */ + /* global buffers */ + + /* buffer for literals or lengths */ + /* DECLARE(uch, l_buf, LIT_BUFSIZE); */ + DECLARE(uch, l_buf, INBUFSIZ); + + DECLARE(ush, d_buf, DIST_BUFSIZE); + DECLARE(uch, outbuf, OUTBUFSIZ); -/* DECLARE(uch, window, 2L*WSIZE); */ /* Sliding window. Input bytes are read into the second half of the window, * and move to the first half later to keep a dictionary of at least WSIZE * bytes. With this organization, matches are limited to a distance of @@ -307,66 +304,63 @@ enum { * To do: limit the window size to WSIZE+BSZ if SMALL_MEM (the code would * be less efficient). */ + DECLARE(uch, window, 2L * WSIZE); -/* DECLARE(Pos, prev, WSIZE); */ /* Link to older string with same hash index. To limit the size of this * array to 64K, this link is maintained only for the last 32K strings. * An index in this array is thus a window index modulo 32K. */ + /* DECLARE(Pos, prev, WSIZE); */ + DECLARE(ush, prev, 1L << BITS); -/* DECLARE(Pos, head, 1<> 8; + if (G1.outcnt < OUTBUFSIZ - 2) { + G1.outbuf[G1.outcnt++] = w; + G1.outbuf[G1.outcnt++] = w >> 8; } else { put_8bit(w); put_8bit(w >> 8); @@ -409,43 +403,14 @@ static void put_32bit(ulg n) put_16bit(n >> 16); } -/* put_header_byte is used for the compressed output - * - for the initial 4 bytes that can't overflow the buffer. - */ -#define put_header_byte(c) \ -{ \ - outbuf[outcnt++] = (c); \ -} - - -/* =========================================================================== - * Clear input and output buffers - */ -static void clear_bufs(void) -{ - outcnt = 0; -#ifdef DEBUG - insize = 0; -#endif - isize = 0L; -} - - /* =========================================================================== * Run a set of bytes through the crc shift register. If s is a NULL * pointer, then initialize the crc shift register contents instead. * Return the current crc in either case. */ -static uint32_t crc; /* shift register contents */ -static uint32_t updcrc(uch * s, unsigned n) +static void updcrc(uch * s, unsigned n) { - uint32_t c = crc; - while (n) { - c = crc_32_tab[(uch)(c ^ *s++)] ^ (c >> 8); - n--; - } - crc = c; - return c; + G1.crc = crc32_block_endian0(G1.crc, s, n, global_crc32_table /*G1.crc_32_tab*/); } @@ -458,32 +423,18 @@ static unsigned file_read(void *buf, unsigned size) { unsigned len; - Assert(insize == 0, "inbuf not empty"); + Assert(G1.insize == 0, "l_buf not empty"); len = safe_read(ifd, buf, size); if (len == (unsigned)(-1) || len == 0) return len; updcrc(buf, len); - isize += len; + G1.isize += len; return len; } -/* =========================================================================== - * Initialize the bit string routines. - */ -static void bi_init(int zipfile) -{ - zfile = zipfile; - bi_buf = 0; - bi_valid = 0; -#ifdef DEBUG - bits_sent = 0L; -#endif -} - - /* =========================================================================== * Send a value on a given number of bits. * IN assertion: length <= 16 and value fits in length bits. @@ -493,20 +444,20 @@ static void send_bits(int value, int length) #ifdef DEBUG Tracev((stderr, " l %2d v %4x ", length, value)); Assert(length > 0 && length <= 15, "invalid length"); - bits_sent += length; + G1.bits_sent += length; #endif /* If not enough room in bi_buf, use (valid) bits from bi_buf and * (16 - bi_valid) bits from value, leaving (width - (16-bi_valid)) * unused bits in value. */ - if (bi_valid > (int) BUF_SIZE - length) { - bi_buf |= (value << bi_valid); - put_16bit(bi_buf); - bi_buf = (ush) value >> (BUF_SIZE - bi_valid); - bi_valid += length - BUF_SIZE; + if (G1.bi_valid > (int) BUF_SIZE - length) { + G1.bi_buf |= (value << G1.bi_valid); + put_16bit(G1.bi_buf); + G1.bi_buf = (ush) value >> (BUF_SIZE - G1.bi_valid); + G1.bi_valid += length - BUF_SIZE; } else { - bi_buf |= value << bi_valid; - bi_valid += length; + G1.bi_buf |= value << G1.bi_valid; + G1.bi_valid += length; } } @@ -534,15 +485,15 @@ static unsigned bi_reverse(unsigned code, int len) */ static void bi_windup(void) { - if (bi_valid > 8) { - put_16bit(bi_buf); - } else if (bi_valid > 0) { - put_8bit(bi_buf); + if (G1.bi_valid > 8) { + put_16bit(G1.bi_buf); + } else if (G1.bi_valid > 0) { + put_8bit(G1.bi_buf); } - bi_buf = 0; - bi_valid = 0; + G1.bi_buf = 0; + G1.bi_valid = 0; #ifdef DEBUG - bits_sent = (bits_sent + 7) & ~7; + G1.bits_sent = (G1.bits_sent + 7) & ~7; #endif } @@ -559,11 +510,11 @@ static void copy_block(char *buf, unsigned len, int header) put_16bit(len); put_16bit(~len); #ifdef DEBUG - bits_sent += 2 * 16; + G1.bits_sent += 2 * 16; #endif } #ifdef DEBUG - bits_sent += (ulg) len << 3; + G1.bits_sent += (ulg) len << 3; #endif while (len--) { put_8bit(*buf++); @@ -582,7 +533,7 @@ static void copy_block(char *buf, unsigned len, int header) static void fill_window(void) { unsigned n, m; - unsigned more = WINDOW_SIZE - lookahead - strstart; + unsigned more = WINDOW_SIZE - G1.lookahead - G1.strstart; /* Amount of free space at the end of the window. */ /* If the window is almost full and there is insufficient lookahead, @@ -593,25 +544,25 @@ static void fill_window(void) * and lookahead == 1 (input done one byte at time) */ more--; - } else if (strstart >= WSIZE + MAX_DIST) { + } else if (G1.strstart >= WSIZE + MAX_DIST) { /* By the IN assertion, the window is not empty so we can't confuse * more == 0 with more == 64K on a 16 bit machine. */ Assert(WINDOW_SIZE == 2 * WSIZE, "no sliding with BIG_MEM"); - memcpy(window, window + WSIZE, WSIZE); - match_start -= WSIZE; - strstart -= WSIZE; /* we now have strstart >= MAX_DIST: */ + memcpy(G1.window, G1.window + WSIZE, WSIZE); + G1.match_start -= WSIZE; + G1.strstart -= WSIZE; /* we now have strstart >= MAX_DIST: */ - block_start -= WSIZE; + G1.block_start -= WSIZE; for (n = 0; n < HASH_SIZE; n++) { m = head[n]; head[n] = (Pos) (m >= WSIZE ? m - WSIZE : 0); } for (n = 0; n < WSIZE; n++) { - m = prev[n]; - prev[n] = (Pos) (m >= WSIZE ? m - WSIZE : 0); + m = G1.prev[n]; + G1.prev[n] = (Pos) (m >= WSIZE ? m - WSIZE : 0); /* If n is not on any hash chain, prev[n] is garbage but * its value will never be used. */ @@ -619,67 +570,17 @@ static void fill_window(void) more += WSIZE; } /* At this point, more >= 2 */ - if (!eofile) { - n = file_read(window + strstart + lookahead, more); + if (!G1.eofile) { + n = file_read(G1.window + G1.strstart + G1.lookahead, more); if (n == 0 || n == (unsigned) -1) { - eofile = 1; + G1.eofile = 1; } else { - lookahead += n; + G1.lookahead += n; } } } -/* =========================================================================== - * Update a hash value with the given input byte - * IN assertion: all calls to to UPDATE_HASH are made with consecutive - * input characters, so that a running hash key can be computed from the - * previous key instead of complete recalculation each time. - */ -#define UPDATE_HASH(h, c) (h = (((h)< (IPos) MAX_DIST ? strstart - (IPos) MAX_DIST : 0; + int best_len = G1.prev_length; /* best match length so far */ + IPos limit = G1.strstart > (IPos) MAX_DIST ? G1.strstart - (IPos) MAX_DIST : 0; /* Stop when cur_match becomes <= limit. To simplify the code, * we prevent matches with the string of window index 0. */ @@ -711,27 +612,29 @@ static int longest_match(IPos cur_match) #if HASH_BITS < 8 || MAX_MATCH != 258 # error Code too clever #endif - uch *strend = window + strstart + MAX_MATCH; + uch *strend = G1.window + G1.strstart + MAX_MATCH; uch scan_end1 = scan[best_len - 1]; uch scan_end = scan[best_len]; /* Do not waste too much time if we already have a good match: */ - if (prev_length >= good_match) { + if (G1.prev_length >= good_match) { chain_length >>= 2; } - Assert(strstart <= WINDOW_SIZE - MIN_LOOKAHEAD, "insufficient lookahead"); + Assert(G1.strstart <= WINDOW_SIZE - MIN_LOOKAHEAD, "insufficient lookahead"); do { - Assert(cur_match < strstart, "no future"); - match = window + cur_match; + Assert(cur_match < G1.strstart, "no future"); + match = G1.window + cur_match; /* Skip to next match if the match length cannot increase * or if the match length is less than 2: */ - if (match[best_len] != scan_end || - match[best_len - 1] != scan_end1 || - *match != *scan || *++match != scan[1]) + if (match[best_len] != scan_end + || match[best_len - 1] != scan_end1 + || *match != *scan || *++match != scan[1] + ) { continue; + } /* The check at best_len-1 can be removed because it will be made * again later. (This heuristic is not always a win.) @@ -754,14 +657,14 @@ static int longest_match(IPos cur_match) scan = strend - MAX_MATCH; if (len > best_len) { - match_start = cur_match; + G1.match_start = cur_match; best_len = len; if (len >= nice_match) break; scan_end1 = scan[best_len - 1]; scan_end = scan[best_len]; } - } while ((cur_match = prev[cur_match & WMASK]) > limit + } while ((cur_match = G1.prev[cur_match & WMASK]) > limit && --chain_length != 0); return best_len; @@ -775,14 +678,14 @@ static int longest_match(IPos cur_match) static void check_match(IPos start, IPos match, int length) { /* check that the match is indeed a match */ - if (memcmp(window + match, window + start, length) != 0) { + if (memcmp(G1.window + match, G1.window + start, length) != 0) { bb_error_msg(" start %d, match %d, length %d", start, match, length); bb_error_msg("invalid match"); } if (verbose > 1) { bb_error_msg("\\[%d,%d]", start - match, length); do { - putc(window[start++], stderr); + bb_putchar_stderr(G1.window[start++]); } while (--length != 0); } } @@ -826,15 +729,15 @@ static void check_match(IPos start, IPos match, int length) * Addison-Wesley, 1983. ISBN 0-201-06672-6. * * INTERFACE - * void ct_init(ush *attr, int *methodp) - * Allocate the match buffer, initialize the various tables and save + * void ct_init() + * Allocate the match buffer, initialize the various tables [and save * the location of the internal file attribute (ascii/binary) and - * method (DEFLATE/STORE) + * method (DEFLATE/STORE) -- deleted in bbox] * * void ct_tally(int dist, int lc); * Save the match info and tally the frequency counts. * - * long flush_block (char *buf, ulg stored_len, int eof) + * ulg flush_block(char *buf, ulg stored_len, int eof) * Determine the best encoding for the current block: dynamic trees, * static trees or store, and output the encoded block to the zip * file. Returns the total compressed length for the file so far. @@ -864,24 +767,26 @@ static void check_match(IPos start, IPos match, int length) #define BL_CODES 19 /* number of codes used to transfer the bit lengths */ -typedef uch extra_bits_t; - /* extra bits for each length code */ -static const extra_bits_t extra_lbits[LENGTH_CODES]= { +static const uint8_t extra_lbits[LENGTH_CODES] ALIGN1 = { 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 }; /* extra bits for each distance code */ -static const extra_bits_t extra_dbits[D_CODES] = { +static const uint8_t extra_dbits[D_CODES] ALIGN1 = { 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 }; /* extra bits for each bit length code */ -static const extra_bits_t extra_blbits[BL_CODES] = { +static const uint8_t extra_blbits[BL_CODES] ALIGN1 = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 3, 7 }; +/* number of codes at each bit length for an optimal tree */ +static const uint8_t bl_order[BL_CODES] ALIGN1 = { + 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 }; + #define STORED_BLOCK 0 #define STATIC_TREES 1 #define DYN_TREES 2 @@ -921,9 +826,6 @@ static const extra_bits_t extra_blbits[BL_CODES] = { * memory at the expense of compression). Some optimizations would be possible * if we rely on DIST_BUFSIZE == LIT_BUFSIZE. */ -#if LIT_BUFSIZE > INBUFSIZ -#error cannot overlay l_buf and inbuf -#endif #define REP_3_6 16 /* repeat previous bit length 3-6 times (2 bits of repeat count) */ #define REPZ_3_10 17 @@ -950,13 +852,33 @@ typedef struct ct_data { #define Dad dl.dad #define Len dl.len -#define HEAP_SIZE (2*L_CODES+1) +#define HEAP_SIZE (2*L_CODES + 1) /* maximum heap size */ -static ct_data dyn_ltree[HEAP_SIZE]; /* literal and length tree */ -static ct_data dyn_dtree[2 * D_CODES + 1]; /* distance tree */ +typedef struct tree_desc { + ct_data *dyn_tree; /* the dynamic tree */ + ct_data *static_tree; /* corresponding static tree or NULL */ + const uint8_t *extra_bits; /* extra bits for each code or NULL */ + int extra_base; /* base index for extra_bits */ + int elems; /* max number of elements in the tree */ + int max_length; /* max bit length for the codes */ + int max_code; /* largest code with non zero frequency */ +} tree_desc; + +struct globals2 { -static ct_data static_ltree[L_CODES + 2]; + ush heap[HEAP_SIZE]; /* heap used to build the Huffman trees */ + int heap_len; /* number of elements in the heap */ + int heap_max; /* element of largest frequency */ + +/* The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used. + * The same heap array is used to build all trees. + */ + + ct_data dyn_ltree[HEAP_SIZE]; /* literal and length tree */ + ct_data dyn_dtree[2 * D_CODES + 1]; /* distance tree */ + + ct_data static_ltree[L_CODES + 2]; /* The static literal tree. Since the bit lengths are imposed, there is no * need for the L_CODES extra codes used during heap construction. However @@ -964,113 +886,75 @@ static ct_data static_ltree[L_CODES + 2]; * below). */ -static ct_data static_dtree[D_CODES]; + ct_data static_dtree[D_CODES]; /* The static distance tree. (Actually a trivial tree since all codes use * 5 bits.) */ -static ct_data bl_tree[2 * BL_CODES + 1]; + ct_data bl_tree[2 * BL_CODES + 1]; /* Huffman tree for the bit lengths */ -typedef struct tree_desc { - ct_data *dyn_tree; /* the dynamic tree */ - ct_data *static_tree; /* corresponding static tree or NULL */ - const extra_bits_t *extra_bits; /* extra bits for each code or NULL */ - int extra_base; /* base index for extra_bits */ - int elems; /* max number of elements in the tree */ - int max_length; /* max bit length for the codes */ - int max_code; /* largest code with non zero frequency */ -} tree_desc; - -static tree_desc l_desc = { - dyn_ltree, static_ltree, extra_lbits, - LITERALS + 1, L_CODES, MAX_BITS, 0 -}; - -static tree_desc d_desc = { - dyn_dtree, static_dtree, extra_dbits, 0, D_CODES, MAX_BITS, 0 -}; - -static tree_desc bl_desc = { - bl_tree, NULL, extra_blbits, 0, BL_CODES, MAX_BL_BITS, 0 -}; - - -static ush bl_count[MAX_BITS + 1]; + tree_desc l_desc; + tree_desc d_desc; + tree_desc bl_desc; -/* number of codes at each bit length for an optimal tree */ - -static const uch bl_order[BL_CODES] = { - 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 -}; + ush bl_count[MAX_BITS + 1]; /* The lengths of the bit length codes are sent in order of decreasing * probability, to avoid transmitting the lengths for unused bit length codes. */ -static int heap[2 * L_CODES + 1]; /* heap used to build the Huffman trees */ -static int heap_len; /* number of elements in the heap */ -static int heap_max; /* element of largest frequency */ - -/* The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used. - * The same heap array is used to build all trees. - */ - -static uch depth[2 * L_CODES + 1]; + uch depth[2 * L_CODES + 1]; /* Depth of each subtree used as tie breaker for trees of equal frequency */ -static uch length_code[MAX_MATCH - MIN_MATCH + 1]; + uch length_code[MAX_MATCH - MIN_MATCH + 1]; /* length code for each normalized match length (0 == MIN_MATCH) */ -static uch dist_code[512]; + uch dist_code[512]; /* distance codes. The first 256 values correspond to the distances * 3 .. 258, the last 256 values correspond to the top 8 bits of * the 15 bit distances. */ -static int base_length[LENGTH_CODES]; + int base_length[LENGTH_CODES]; /* First normalized length for each code (0 = MIN_MATCH) */ -static int base_dist[D_CODES]; + int base_dist[D_CODES]; /* First normalized distance for each code (0 = distance of 1) */ -#define l_buf inbuf -/* DECLARE(uch, l_buf, LIT_BUFSIZE); buffer for literals or lengths */ - -/* DECLARE(ush, d_buf, DIST_BUFSIZE); buffer for distances */ - -static uch flag_buf[(LIT_BUFSIZE / 8)]; + uch flag_buf[LIT_BUFSIZE / 8]; /* flag_buf is a bit array distinguishing literals from lengths in * l_buf, thus indicating the presence or absence of a distance. */ -static unsigned last_lit; /* running index in l_buf */ -static unsigned last_dist; /* running index in d_buf */ -static unsigned last_flags; /* running index in flag_buf */ -static uch flags; /* current flags not yet saved in flag_buf */ -static uch flag_bit; /* current bit used in flags */ + unsigned last_lit; /* running index in l_buf */ + unsigned last_dist; /* running index in d_buf */ + unsigned last_flags; /* running index in flag_buf */ + uch flags; /* current flags not yet saved in flag_buf */ + uch flag_bit; /* current bit used in flags */ /* bits are filled in flags starting at bit 0 (least significant). * Note: these flags are overkill in the current code since we don't * take advantage of DIST_BUFSIZE == LIT_BUFSIZE. */ -static ulg opt_len; /* bit length of current block with optimal trees */ -static ulg static_len; /* bit length of current block with static trees */ + ulg opt_len; /* bit length of current block with optimal trees */ + ulg static_len; /* bit length of current block with static trees */ -static ulg compressed_len; /* total bit length of compressed file */ + ulg compressed_len; /* total bit length of compressed file */ +}; +#define G2ptr ((struct globals2*)(ptr_to_globals)) +#define G2 (*G2ptr) -static ush *file_type; /* pointer to UNKNOWN, BINARY or ASCII */ -static int *file_method; /* pointer to DEFLATE or STORE */ /* =========================================================================== */ @@ -1089,13 +973,13 @@ static void compress_block(ct_data * ltree, ct_data * dtree); #else # define SEND_CODE(c, tree) \ { \ - if (verbose > 1) bb_error_msg("\ncd %3d ",(c)); \ - send_bits(tree[c].Code, tree[c].Len); \ + if (verbose > 1) bb_error_msg("\ncd %3d ", (c)); \ + send_bits(tree[c].Code, tree[c].Len); \ } #endif #define D_CODE(dist) \ - ((dist) < 256 ? dist_code[dist] : dist_code[256 + ((dist)>>7)]) + ((dist) < 256 ? G2.dist_code[dist] : G2.dist_code[256 + ((dist)>>7)]) /* Mapping from a distance to a distance code. dist is the distance - 1 and * must not have side effects. dist_code[256] and dist_code[257] are never * used. @@ -1112,108 +996,17 @@ static void init_block(void) /* Initialize the trees. */ for (n = 0; n < L_CODES; n++) - dyn_ltree[n].Freq = 0; + G2.dyn_ltree[n].Freq = 0; for (n = 0; n < D_CODES; n++) - dyn_dtree[n].Freq = 0; + G2.dyn_dtree[n].Freq = 0; for (n = 0; n < BL_CODES; n++) - bl_tree[n].Freq = 0; + G2.bl_tree[n].Freq = 0; - dyn_ltree[END_BLOCK].Freq = 1; - opt_len = static_len = 0L; - last_lit = last_dist = last_flags = 0; - flags = 0; - flag_bit = 1; -} - - -/* =========================================================================== - * Allocate the match buffer, initialize the various tables and save the - * location of the internal file attribute (ascii/binary) and method - * (DEFLATE/STORE). - */ -static void ct_init(ush * attr, int *methodp) -{ - int n; /* iterates over tree elements */ - int bits; /* bit counter */ - int length; /* length value */ - int code; /* code value */ - int dist; /* distance index */ - - file_type = attr; - file_method = methodp; - compressed_len = 0L; - - if (static_dtree[0].Len != 0) - return; /* ct_init already called */ - - /* Initialize the mapping length (0..255) -> length code (0..28) */ - length = 0; - for (code = 0; code < LENGTH_CODES - 1; code++) { - base_length[code] = length; - for (n = 0; n < (1 << extra_lbits[code]); n++) { - length_code[length++] = code; - } - } - Assert(length == 256, "ct_init: length != 256"); - /* Note that the length 255 (match length 258) can be represented - * in two different ways: code 284 + 5 bits or code 285, so we - * overwrite length_code[255] to use the best encoding: - */ - length_code[length - 1] = code; - - /* Initialize the mapping dist (0..32K) -> dist code (0..29) */ - dist = 0; - for (code = 0; code < 16; code++) { - base_dist[code] = dist; - for (n = 0; n < (1 << extra_dbits[code]); n++) { - dist_code[dist++] = code; - } - } - Assert(dist == 256, "ct_init: dist != 256"); - dist >>= 7; /* from now on, all distances are divided by 128 */ - for (; code < D_CODES; code++) { - base_dist[code] = dist << 7; - for (n = 0; n < (1 << (extra_dbits[code] - 7)); n++) { - dist_code[256 + dist++] = (uch) code; - } - } - Assert(dist == 256, "ct_init: 256+dist != 512"); - - /* Construct the codes of the static literal tree */ - for (bits = 0; bits <= MAX_BITS; bits++) - bl_count[bits] = 0; - - n = 0; - while (n <= 143) { - static_ltree[n++].Len = 8; - bl_count[8]++; - } - while (n <= 255) { - static_ltree[n++].Len = 9; - bl_count[9]++; - } - while (n <= 279) { - static_ltree[n++].Len = 7; - bl_count[7]++; - } - while (n <= 287) { - static_ltree[n++].Len = 8; - bl_count[8]++; - } - /* Codes 286 and 287 do not exist, but we must include them in the - * tree construction to get a canonical Huffman tree (longest code - * all ones) - */ - gen_codes((ct_data *) static_ltree, L_CODES + 1); - - /* The static distance tree is trivial: */ - for (n = 0; n < D_CODES; n++) { - static_dtree[n].Len = 5; - static_dtree[n].Code = bi_reverse(n, 5); - } - - /* Initialize the first block of the first file: */ - init_block(); + G2.dyn_ltree[END_BLOCK].Freq = 1; + G2.opt_len = G2.static_len = 0; + G2.last_lit = G2.last_dist = G2.last_flags = 0; + G2.flags = 0; + G2.flag_bit = 1; } @@ -1228,30 +1021,30 @@ static void ct_init(ush * attr, int *methodp) * the subtrees have equal frequency. This minimizes the worst case length. */ #define SMALLER(tree, n, m) \ (tree[n].Freq < tree[m].Freq \ - || (tree[n].Freq == tree[m].Freq && depth[n] <= depth[m])) + || (tree[n].Freq == tree[m].Freq && G2.depth[n] <= G2.depth[m])) static void pqdownheap(ct_data * tree, int k) { - int v = heap[k]; + int v = G2.heap[k]; int j = k << 1; /* left son of k */ - while (j <= heap_len) { + while (j <= G2.heap_len) { /* Set j to the smallest of the two sons: */ - if (j < heap_len && SMALLER(tree, heap[j + 1], heap[j])) + if (j < G2.heap_len && SMALLER(tree, G2.heap[j + 1], G2.heap[j])) j++; /* Exit if v is smaller than both sons */ - if (SMALLER(tree, v, heap[j])) + if (SMALLER(tree, v, G2.heap[j])) break; /* Exchange v with the smallest son */ - heap[k] = heap[j]; + G2.heap[k] = G2.heap[j]; k = j; /* And continue down the tree, setting j to the left son of k */ j <<= 1; } - heap[k] = v; + G2.heap[k] = v; } @@ -1268,7 +1061,7 @@ static void pqdownheap(ct_data * tree, int k) static void gen_bitlen(tree_desc * desc) { ct_data *tree = desc->dyn_tree; - const extra_bits_t *extra = desc->extra_bits; + const uint8_t *extra = desc->extra_bits; int base = desc->extra_base; int max_code = desc->max_code; int max_length = desc->max_length; @@ -1281,15 +1074,15 @@ static void gen_bitlen(tree_desc * desc) int overflow = 0; /* number of elements with bit length too large */ for (bits = 0; bits <= MAX_BITS; bits++) - bl_count[bits] = 0; + G2.bl_count[bits] = 0; /* In a first pass, compute the optimal bit lengths (which may * overflow in the case of the bit length tree). */ - tree[heap[heap_max]].Len = 0; /* root of the heap */ + tree[G2.heap[G2.heap_max]].Len = 0; /* root of the heap */ - for (h = heap_max + 1; h < HEAP_SIZE; h++) { - n = heap[h]; + for (h = G2.heap_max + 1; h < HEAP_SIZE; h++) { + n = G2.heap[h]; bits = tree[tree[n].Dad].Len + 1; if (bits > max_length) { bits = max_length; @@ -1301,15 +1094,15 @@ static void gen_bitlen(tree_desc * desc) if (n > max_code) continue; /* not a leaf node */ - bl_count[bits]++; + G2.bl_count[bits]++; xbits = 0; if (n >= base) xbits = extra[n - base]; f = tree[n].Freq; - opt_len += (ulg) f *(bits + xbits); + G2.opt_len += (ulg) f *(bits + xbits); if (stree) - static_len += (ulg) f * (stree[n].Len + xbits); + G2.static_len += (ulg) f * (stree[n].Len + xbits); } if (overflow == 0) return; @@ -1320,11 +1113,11 @@ static void gen_bitlen(tree_desc * desc) /* Find the first bit length which could increase: */ do { bits = max_length - 1; - while (bl_count[bits] == 0) + while (G2.bl_count[bits] == 0) bits--; - bl_count[bits]--; /* move one leaf down the tree */ - bl_count[bits + 1] += 2; /* move one overflow item as its brother */ - bl_count[max_length]--; + G2.bl_count[bits]--; /* move one leaf down the tree */ + G2.bl_count[bits + 1] += 2; /* move one overflow item as its brother */ + G2.bl_count[max_length]--; /* The brother of the overflow item also moves one step up, * but this does not affect bl_count[max_length] */ @@ -1337,15 +1130,15 @@ static void gen_bitlen(tree_desc * desc) * from 'ar' written by Haruhiko Okumura.) */ for (bits = max_length; bits != 0; bits--) { - n = bl_count[bits]; + n = G2.bl_count[bits]; while (n != 0) { - m = heap[--h]; + m = G2.heap[--h]; if (m > max_code) continue; if (tree[m].Len != (unsigned) bits) { Trace((stderr, "code %d bits %d->%d\n", m, tree[m].Len, bits)); - opt_len += ((long) bits - (long) tree[m].Len) * (long) tree[m].Freq; - tree[m].Len = (ush) bits; + G2.opt_len += ((int32_t) bits - tree[m].Len) * tree[m].Freq; + tree[m].Len = bits; } n--; } @@ -1372,12 +1165,12 @@ static void gen_codes(ct_data * tree, int max_code) * without bit reversal. */ for (bits = 1; bits <= MAX_BITS; bits++) { - next_code[bits] = code = (code + bl_count[bits - 1]) << 1; + next_code[bits] = code = (code + G2.bl_count[bits - 1]) << 1; } /* Check that the bit counts in bl_count are consistent. The last code * must be all ones. */ - Assert(code + bl_count[MAX_BITS] - 1 == (1 << MAX_BITS) - 1, + Assert(code + G2.bl_count[MAX_BITS] - 1 == (1 << MAX_BITS) - 1, "inconsistent bit counts"); Tracev((stderr, "\ngen_codes: max_code %d ", max_code)); @@ -1389,9 +1182,9 @@ static void gen_codes(ct_data * tree, int max_code) /* Now reverse the bits */ tree[n].Code = bi_reverse(next_code[len]++, len); - Tracec(tree != static_ltree, + Tracec(tree != G2.static_ltree, (stderr, "\nn %3d %c l %2d c %4x (%x) ", n, - (isgraph(n) ? n : ' '), len, tree[n].Code, + (n > ' ' ? n : ' '), len, tree[n].Code, next_code[len] - 1)); } } @@ -1413,11 +1206,11 @@ static void gen_codes(ct_data * tree, int max_code) /* Index within the heap array of least frequent node in the Huffman tree */ #define PQREMOVE(tree, top) \ -{ \ - top = heap[SMALLEST]; \ - heap[SMALLEST] = heap[heap_len--]; \ +do { \ + top = G2.heap[SMALLEST]; \ + G2.heap[SMALLEST] = G2.heap[G2.heap_len--]; \ pqdownheap(tree, SMALLEST); \ -} +} while (0) static void build_tree(tree_desc * desc) { @@ -1432,12 +1225,13 @@ static void build_tree(tree_desc * desc) * heap[SMALLEST]. The sons of heap[n] are heap[2*n] and heap[2*n+1]. * heap[0] is not used. */ - heap_len = 0, heap_max = HEAP_SIZE; + G2.heap_len = 0; + G2.heap_max = HEAP_SIZE; for (n = 0; n < elems; n++) { if (tree[n].Freq != 0) { - heap[++heap_len] = max_code = n; - depth[n] = 0; + G2.heap[++G2.heap_len] = max_code = n; + G2.depth[n] = 0; } else { tree[n].Len = 0; } @@ -1448,14 +1242,14 @@ static void build_tree(tree_desc * desc) * possible code. So to avoid special checks later on we force at least * two codes of non zero frequency. */ - while (heap_len < 2) { - int new = heap[++heap_len] = (max_code < 2 ? ++max_code : 0); + while (G2.heap_len < 2) { + int new = G2.heap[++G2.heap_len] = (max_code < 2 ? ++max_code : 0); tree[new].Freq = 1; - depth[new] = 0; - opt_len--; + G2.depth[new] = 0; + G2.opt_len--; if (stree) - static_len -= stree[new].Len; + G2.static_len -= stree[new].Len; /* new is 0 or 1 so it does not have extra bits */ } desc->max_code = max_code; @@ -1463,7 +1257,7 @@ static void build_tree(tree_desc * desc) /* The elements heap[heap_len/2+1 .. heap_len] are leaves of the tree, * establish sub-heaps of increasing lengths: */ - for (n = heap_len / 2; n >= 1; n--) + for (n = G2.heap_len / 2; n >= 1; n--) pqdownheap(tree, n); /* Construct the Huffman tree by repeatedly combining the least two @@ -1471,28 +1265,28 @@ static void build_tree(tree_desc * desc) */ do { PQREMOVE(tree, n); /* n = node of least frequency */ - m = heap[SMALLEST]; /* m = node of next least frequency */ + m = G2.heap[SMALLEST]; /* m = node of next least frequency */ - heap[--heap_max] = n; /* keep the nodes sorted by frequency */ - heap[--heap_max] = m; + G2.heap[--G2.heap_max] = n; /* keep the nodes sorted by frequency */ + G2.heap[--G2.heap_max] = m; /* Create a new node father of n and m */ tree[node].Freq = tree[n].Freq + tree[m].Freq; - depth[node] = (uch) (MAX(depth[n], depth[m]) + 1); + G2.depth[node] = MAX(G2.depth[n], G2.depth[m]) + 1; tree[n].Dad = tree[m].Dad = (ush) node; #ifdef DUMP_BL_TREE - if (tree == bl_tree) { + if (tree == G2.bl_tree) { bb_error_msg("\nnode %d(%d), sons %d(%d) %d(%d)", node, tree[node].Freq, n, tree[n].Freq, m, tree[m].Freq); } #endif /* and insert the new node in the heap */ - heap[SMALLEST] = node++; + G2.heap[SMALLEST] = node++; pqdownheap(tree, SMALLEST); - } while (heap_len >= 2); + } while (G2.heap_len >= 2); - heap[--heap_max] = heap[SMALLEST]; + G2.heap[--G2.heap_max] = G2.heap[SMALLEST]; /* At this point, the fields freq and dad are set. We can now * generate the bit lengths. @@ -1524,35 +1318,36 @@ static void scan_tree(ct_data * tree, int max_code) max_count = 138; min_count = 3; } - tree[max_code + 1].Len = (ush) 0xffff; /* guard */ + tree[max_code + 1].Len = 0xffff; /* guard */ for (n = 0; n <= max_code; n++) { curlen = nextlen; nextlen = tree[n + 1].Len; - if (++count < max_count && curlen == nextlen) { + if (++count < max_count && curlen == nextlen) continue; - } else if (count < min_count) { - bl_tree[curlen].Freq += count; + + if (count < min_count) { + G2.bl_tree[curlen].Freq += count; } else if (curlen != 0) { if (curlen != prevlen) - bl_tree[curlen].Freq++; - bl_tree[REP_3_6].Freq++; + G2.bl_tree[curlen].Freq++; + G2.bl_tree[REP_3_6].Freq++; } else if (count <= 10) { - bl_tree[REPZ_3_10].Freq++; + G2.bl_tree[REPZ_3_10].Freq++; } else { - bl_tree[REPZ_11_138].Freq++; + G2.bl_tree[REPZ_11_138].Freq++; } count = 0; prevlen = curlen; + + max_count = 7; + min_count = 4; if (nextlen == 0) { max_count = 138; min_count = 3; } else if (curlen == nextlen) { max_count = 6; min_count = 3; - } else { - max_count = 7; - min_count = 4; } } } @@ -1583,21 +1378,21 @@ static void send_tree(ct_data * tree, int max_code) continue; } else if (count < min_count) { do { - SEND_CODE(curlen, bl_tree); + SEND_CODE(curlen, G2.bl_tree); } while (--count); } else if (curlen != 0) { if (curlen != prevlen) { - SEND_CODE(curlen, bl_tree); + SEND_CODE(curlen, G2.bl_tree); count--; } Assert(count >= 3 && count <= 6, " 3_6?"); - SEND_CODE(REP_3_6, bl_tree); + SEND_CODE(REP_3_6, G2.bl_tree); send_bits(count - 3, 2); } else if (count <= 10) { - SEND_CODE(REPZ_3_10, bl_tree); + SEND_CODE(REPZ_3_10, G2.bl_tree); send_bits(count - 3, 3); } else { - SEND_CODE(REPZ_11_138, bl_tree); + SEND_CODE(REPZ_11_138, G2.bl_tree); send_bits(count - 11, 7); } count = 0; @@ -1625,11 +1420,11 @@ static int build_bl_tree(void) int max_blindex; /* index of last bit length code of non zero freq */ /* Determine the bit length frequencies for literal and distance trees */ - scan_tree((ct_data *) dyn_ltree, l_desc.max_code); - scan_tree((ct_data *) dyn_dtree, d_desc.max_code); + scan_tree(G2.dyn_ltree, G2.l_desc.max_code); + scan_tree(G2.dyn_dtree, G2.d_desc.max_code); /* Build the bit length tree: */ - build_tree((tree_desc *) (&bl_desc)); + build_tree(&G2.bl_desc); /* opt_len now includes the length of the tree representations, except * the lengths of the bit lengths codes and the 5+5+4 bits for the counts. */ @@ -1639,12 +1434,12 @@ static int build_bl_tree(void) * 3 but the actual value used is 4.) */ for (max_blindex = BL_CODES - 1; max_blindex >= 3; max_blindex--) { - if (bl_tree[bl_order[max_blindex]].Len != 0) + if (G2.bl_tree[bl_order[max_blindex]].Len != 0) break; } /* Update opt_len to include the bit length tree and counts */ - opt_len += 3 * (max_blindex + 1) + 5 + 5 + 4; - Tracev((stderr, "\ndyn trees: dyn %ld, stat %ld", opt_len, static_len)); + G2.opt_len += 3 * (max_blindex + 1) + 5 + 5 + 4; + Tracev((stderr, "\ndyn trees: dyn %ld, stat %ld", G2.opt_len, G2.static_len)); return max_blindex; } @@ -1668,40 +1463,15 @@ static void send_all_trees(int lcodes, int dcodes, int blcodes) send_bits(blcodes - 4, 4); /* not -3 as stated in appnote.txt */ for (rank = 0; rank < blcodes; rank++) { Tracev((stderr, "\nbl code %2d ", bl_order[rank])); - send_bits(bl_tree[bl_order[rank]].Len, 3); + send_bits(G2.bl_tree[bl_order[rank]].Len, 3); } - Tracev((stderr, "\nbl tree: sent %ld", bits_sent)); + Tracev((stderr, "\nbl tree: sent %ld", G1.bits_sent)); - send_tree((ct_data *) dyn_ltree, lcodes - 1); /* send the literal tree */ - Tracev((stderr, "\nlit tree: sent %ld", bits_sent)); + send_tree((ct_data *) G2.dyn_ltree, lcodes - 1); /* send the literal tree */ + Tracev((stderr, "\nlit tree: sent %ld", G1.bits_sent)); - send_tree((ct_data *) dyn_dtree, dcodes - 1); /* send the distance tree */ - Tracev((stderr, "\ndist tree: sent %ld", bits_sent)); -} - - -/* =========================================================================== - * Set the file type to ASCII or BINARY, using a crude approximation: - * binary if more than 20% of the bytes are <= 6 or >= 128, ascii otherwise. - * IN assertion: the fields freq of dyn_ltree are set and the total of all - * frequencies does not exceed 64K (to fit in an int on 16 bit machines). - */ -static void set_file_type(void) -{ - int n = 0; - unsigned ascii_freq = 0; - unsigned bin_freq = 0; - - while (n < 7) - bin_freq += dyn_ltree[n++].Freq; - while (n < 128) - ascii_freq += dyn_ltree[n++].Freq; - while (n < LITERALS) - bin_freq += dyn_ltree[n++].Freq; - *file_type = (bin_freq > (ascii_freq >> 2)) ? BINARY : ASCII; - if (*file_type == BINARY && translate_eol) { - bb_error_msg("-l used on binary file"); - } + send_tree((ct_data *) G2.dyn_dtree, dcodes - 1); /* send the distance tree */ + Tracev((stderr, "\ndist tree: sent %ld", G1.bits_sent)); } @@ -1711,10 +1481,10 @@ static void set_file_type(void) */ static int ct_tally(int dist, int lc) { - l_buf[last_lit++] = lc; + G1.l_buf[G2.last_lit++] = lc; if (dist == 0) { /* lc is the unmatched char */ - dyn_ltree[lc].Freq++; + G2.dyn_ltree[lc].Freq++; } else { /* Here, lc is the match length - MIN_MATCH */ dist--; /* dist = match distance - 1 */ @@ -1723,38 +1493,39 @@ static int ct_tally(int dist, int lc) && (ush) D_CODE(dist) < (ush) D_CODES, "ct_tally: bad match" ); - dyn_ltree[length_code[lc] + LITERALS + 1].Freq++; - dyn_dtree[D_CODE(dist)].Freq++; + G2.dyn_ltree[G2.length_code[lc] + LITERALS + 1].Freq++; + G2.dyn_dtree[D_CODE(dist)].Freq++; - d_buf[last_dist++] = dist; - flags |= flag_bit; + G1.d_buf[G2.last_dist++] = dist; + G2.flags |= G2.flag_bit; } - flag_bit <<= 1; + G2.flag_bit <<= 1; /* Output the flags if they fill a byte: */ - if ((last_lit & 7) == 0) { - flag_buf[last_flags++] = flags; - flags = 0, flag_bit = 1; + if ((G2.last_lit & 7) == 0) { + G2.flag_buf[G2.last_flags++] = G2.flags; + G2.flags = 0; + G2.flag_bit = 1; } /* Try to guess if it is profitable to stop the current block here */ - if ((last_lit & 0xfff) == 0) { + if ((G2.last_lit & 0xfff) == 0) { /* Compute an upper bound for the compressed length */ - ulg out_length = last_lit * 8L; - ulg in_length = (ulg) strstart - block_start; + ulg out_length = G2.last_lit * 8L; + ulg in_length = (ulg) G1.strstart - G1.block_start; int dcode; for (dcode = 0; dcode < D_CODES; dcode++) { - out_length += dyn_dtree[dcode].Freq * (5L + extra_dbits[dcode]); + out_length += G2.dyn_dtree[dcode].Freq * (5L + extra_dbits[dcode]); } out_length >>= 3; Trace((stderr, "\nlast_lit %u, last_dist %u, in %ld, out ~%ld(%ld%%) ", - last_lit, last_dist, in_length, out_length, + G2.last_lit, G2.last_dist, in_length, out_length, 100L - out_length * 100L / in_length)); - if (last_dist < last_lit / 2 && out_length < in_length / 2) + if (G2.last_dist < G2.last_lit / 2 && out_length < in_length / 2) return 1; } - return (last_lit == LIT_BUFSIZE - 1 || last_dist == DIST_BUFSIZE); + return (G2.last_lit == LIT_BUFSIZE - 1 || G2.last_dist == DIST_BUFSIZE); /* We avoid equality with LIT_BUFSIZE because of wraparound at 64K * on 16 bit machines and because stored blocks are restricted to * 64K-1 bytes. @@ -1766,47 +1537,45 @@ static int ct_tally(int dist, int lc) */ static void compress_block(ct_data * ltree, ct_data * dtree) { - unsigned dist; /* distance of matched string */ - int lc; /* match length or unmatched char (if dist == 0) */ - unsigned lx = 0; /* running index in l_buf */ - unsigned dx = 0; /* running index in d_buf */ - unsigned fx = 0; /* running index in flag_buf */ - uch flag = 0; /* current flags */ - unsigned code; /* the code to send */ - int extra; /* number of extra bits to send */ - - if (last_lit != 0) { - do { - if ((lx & 7) == 0) - flag = flag_buf[fx++]; - lc = l_buf[lx++]; - if ((flag & 1) == 0) { - SEND_CODE(lc, ltree); /* send a literal byte */ - Tracecv(isgraph(lc), (stderr, " '%c' ", lc)); - } else { - /* Here, lc is the match length - MIN_MATCH */ - code = length_code[lc]; - SEND_CODE(code + LITERALS + 1, ltree); /* send the length code */ - extra = extra_lbits[code]; - if (extra != 0) { - lc -= base_length[code]; - send_bits(lc, extra); /* send the extra length bits */ - } - dist = d_buf[dx++]; - /* Here, dist is the match distance - 1 */ - code = D_CODE(dist); - Assert(code < D_CODES, "bad d_code"); - - SEND_CODE(code, dtree); /* send the distance code */ - extra = extra_dbits[code]; - if (extra != 0) { - dist -= base_dist[code]; - send_bits(dist, extra); /* send the extra distance bits */ - } - } /* literal or match pair ? */ - flag >>= 1; - } while (lx < last_lit); - } + unsigned dist; /* distance of matched string */ + int lc; /* match length or unmatched char (if dist == 0) */ + unsigned lx = 0; /* running index in l_buf */ + unsigned dx = 0; /* running index in d_buf */ + unsigned fx = 0; /* running index in flag_buf */ + uch flag = 0; /* current flags */ + unsigned code; /* the code to send */ + int extra; /* number of extra bits to send */ + + if (G2.last_lit != 0) do { + if ((lx & 7) == 0) + flag = G2.flag_buf[fx++]; + lc = G1.l_buf[lx++]; + if ((flag & 1) == 0) { + SEND_CODE(lc, ltree); /* send a literal byte */ + Tracecv(lc > ' ', (stderr, " '%c' ", lc)); + } else { + /* Here, lc is the match length - MIN_MATCH */ + code = G2.length_code[lc]; + SEND_CODE(code + LITERALS + 1, ltree); /* send the length code */ + extra = extra_lbits[code]; + if (extra != 0) { + lc -= G2.base_length[code]; + send_bits(lc, extra); /* send the extra length bits */ + } + dist = G1.d_buf[dx++]; + /* Here, dist is the match distance - 1 */ + code = D_CODE(dist); + Assert(code < D_CODES, "bad d_code"); + + SEND_CODE(code, dtree); /* send the distance code */ + extra = extra_dbits[code]; + if (extra != 0) { + dist -= G2.base_dist[code]; + send_bits(dist, extra); /* send the extra distance bits */ + } + } /* literal or match pair ? */ + flag >>= 1; + } while (lx < G2.last_lit); SEND_CODE(END_BLOCK, ltree); } @@ -1819,21 +1588,17 @@ static void compress_block(ct_data * ltree, ct_data * dtree) */ static ulg flush_block(char *buf, ulg stored_len, int eof) { - ulg opt_lenb, static_lenb; /* opt_len and static_len in bytes */ - int max_blindex; /* index of last bit length code of non zero freq */ - - flag_buf[last_flags] = flags; /* Save the flags for the last 8 items */ + ulg opt_lenb, static_lenb; /* opt_len and static_len in bytes */ + int max_blindex; /* index of last bit length code of non zero freq */ - /* Check if the file is ascii or binary */ - if (*file_type == (ush) UNKNOWN) - set_file_type(); + G2.flag_buf[G2.last_flags] = G2.flags; /* Save the flags for the last 8 items */ /* Construct the literal and distance trees */ - build_tree((tree_desc *) (&l_desc)); - Tracev((stderr, "\nlit data: dyn %ld, stat %ld", opt_len, static_len)); + build_tree(&G2.l_desc); + Tracev((stderr, "\nlit data: dyn %ld, stat %ld", G2.opt_len, G2.static_len)); - build_tree((tree_desc *) (&d_desc)); - Tracev((stderr, "\ndist data: dyn %ld, stat %ld", opt_len, static_len)); + build_tree(&G2.d_desc); + Tracev((stderr, "\ndist data: dyn %ld, stat %ld", G2.opt_len, G2.static_len)); /* At this point, opt_len and static_len are the total bit lengths of * the compressed block data, excluding the tree representations. */ @@ -1844,13 +1609,13 @@ static ulg flush_block(char *buf, ulg stored_len, int eof) max_blindex = build_bl_tree(); /* Determine the best encoding. Compute first the block length in bytes */ - opt_lenb = (opt_len + 3 + 7) >> 3; - static_lenb = (static_len + 3 + 7) >> 3; + opt_lenb = (G2.opt_len + 3 + 7) >> 3; + static_lenb = (G2.static_len + 3 + 7) >> 3; Trace((stderr, "\nopt %lu(%lu) stat %lu(%lu) stored %lu lit %u dist %u ", - opt_lenb, opt_len, static_lenb, static_len, stored_len, - last_lit, last_dist)); + opt_lenb, G2.opt_len, static_lenb, G2.static_len, stored_len, + G2.last_lit, G2.last_dist)); if (static_lenb <= opt_lenb) opt_lenb = static_lenb; @@ -1859,16 +1624,15 @@ static ulg flush_block(char *buf, ulg stored_len, int eof) * and if the zip file can be seeked (to rewrite the local header), * the whole file is transformed into a stored file: */ - if (stored_len <= opt_lenb && eof && compressed_len == 0L && seekable()) { + if (stored_len <= opt_lenb && eof && G2.compressed_len == 0L && seekable()) { /* Since LIT_BUFSIZE <= 2*WSIZE, the input data must be there: */ if (buf == NULL) bb_error_msg("block vanished"); copy_block(buf, (unsigned) stored_len, 0); /* without header */ - compressed_len = stored_len << 3; - *file_method = STORED; + G2.compressed_len = stored_len << 3; - } else if (stored_len + 4 <= opt_lenb && buf != (char *) 0) { + } else if (stored_len + 4 <= opt_lenb && buf != NULL) { /* 4: two words for the lengths */ /* The test buf != NULL is only necessary if LIT_BUFSIZE > WSIZE. * Otherwise we can't have processed more than WSIZE input bytes since @@ -1877,36 +1641,45 @@ static ulg flush_block(char *buf, ulg stored_len, int eof) * transform a block into a stored block. */ send_bits((STORED_BLOCK << 1) + eof, 3); /* send block type */ - compressed_len = (compressed_len + 3 + 7) & ~7L; - compressed_len += (stored_len + 4) << 3; + G2.compressed_len = (G2.compressed_len + 3 + 7) & ~7L; + G2.compressed_len += (stored_len + 4) << 3; copy_block(buf, (unsigned) stored_len, 1); /* with header */ } else if (static_lenb == opt_lenb) { send_bits((STATIC_TREES << 1) + eof, 3); - compress_block((ct_data *) static_ltree, (ct_data *) static_dtree); - compressed_len += 3 + static_len; + compress_block((ct_data *) G2.static_ltree, (ct_data *) G2.static_dtree); + G2.compressed_len += 3 + G2.static_len; } else { send_bits((DYN_TREES << 1) + eof, 3); - send_all_trees(l_desc.max_code + 1, d_desc.max_code + 1, + send_all_trees(G2.l_desc.max_code + 1, G2.d_desc.max_code + 1, max_blindex + 1); - compress_block((ct_data *) dyn_ltree, (ct_data *) dyn_dtree); - compressed_len += 3 + opt_len; + compress_block((ct_data *) G2.dyn_ltree, (ct_data *) G2.dyn_dtree); + G2.compressed_len += 3 + G2.opt_len; } - Assert(compressed_len == bits_sent, "bad compressed size"); + Assert(G2.compressed_len == G1.bits_sent, "bad compressed size"); init_block(); if (eof) { bi_windup(); - compressed_len += 7; /* align on byte boundary */ + G2.compressed_len += 7; /* align on byte boundary */ } - Tracev((stderr, "\ncomprlen %lu(%lu) ", compressed_len >> 3, - compressed_len - 7 * eof)); + Tracev((stderr, "\ncomprlen %lu(%lu) ", G2.compressed_len >> 3, + G2.compressed_len - 7 * eof)); - return compressed_len >> 3; + return G2.compressed_len >> 3; } +/* =========================================================================== + * Update a hash value with the given input byte + * IN assertion: all calls to UPDATE_HASH are made with consecutive + * input characters, so that a running hash key can be computed from the + * previous key instead of complete recalculation each time. + */ +#define UPDATE_HASH(h, c) (h = (((h)<= 0L \ - ? (char*)&window[(unsigned)block_start] \ + G1.block_start >= 0L \ + ? (char*)&G1.window[(unsigned)G1.block_start] \ : (char*)NULL, \ - (long)strstart - block_start, \ + (ulg)G1.strstart - G1.block_start, \ (eof) \ ) /* Insert string s in the dictionary and set match_head to the previous head * of the hash chain (the most recent string with same hash key). Return * the previous length of the hash chain. - * IN assertion: all calls to to INSERT_STRING are made with consecutive + * IN assertion: all calls to INSERT_STRING are made with consecutive * input characters and the first MIN_MATCH bytes of s are valid * (except for the last MIN_MATCH-1 bytes of the input file). */ #define INSERT_STRING(s, match_head) \ -{ \ - UPDATE_HASH(ins_h, window[(s) + MIN_MATCH-1]); \ - prev[(s) & WMASK] = match_head = head[ins_h]; \ - head[ins_h] = (s); \ -} +do { \ + UPDATE_HASH(G1.ins_h, G1.window[(s) + MIN_MATCH-1]); \ + G1.prev[(s) & WMASK] = match_head = head[G1.ins_h]; \ + head[G1.ins_h] = (s); \ +} while (0) static ulg deflate(void) { @@ -1950,19 +1723,20 @@ static ulg deflate(void) unsigned match_length = MIN_MATCH - 1; /* length of best match */ /* Process the input block. */ - while (lookahead != 0) { + while (G1.lookahead != 0) { /* Insert the string window[strstart .. strstart+2] in the * dictionary, and set hash_head to the head of the hash chain: */ - INSERT_STRING(strstart, hash_head); + INSERT_STRING(G1.strstart, hash_head); /* Find the longest match, discarding those <= prev_length. */ - prev_length = match_length, prev_match = match_start; + G1.prev_length = match_length; + prev_match = G1.match_start; match_length = MIN_MATCH - 1; - if (hash_head != 0 && prev_length < max_lazy_match - && strstart - hash_head <= MAX_DIST + if (hash_head != 0 && G1.prev_length < max_lazy_match + && G1.strstart - hash_head <= MAX_DIST ) { /* To simplify the code, we prevent matches with the string * of window index 0 (in particular we have to avoid a match @@ -1970,12 +1744,12 @@ static ulg deflate(void) */ match_length = longest_match(hash_head); /* longest_match() sets match_start */ - if (match_length > lookahead) - match_length = lookahead; + if (match_length > G1.lookahead) + match_length = G1.lookahead; /* Ignore a length 3 match if it is too distant: */ - if (match_length == MIN_MATCH && strstart - match_start > TOO_FAR) { - /* If prev_match is also MIN_MATCH, match_start is garbage + if (match_length == MIN_MATCH && G1.strstart - G1.match_start > TOO_FAR) { + /* If prev_match is also MIN_MATCH, G1.match_start is garbage * but we will ignore the current match anyway. */ match_length--; @@ -1984,99 +1758,238 @@ static ulg deflate(void) /* If there was a match at the previous step and the current * match is not better, output the previous match: */ - if (prev_length >= MIN_MATCH && match_length <= prev_length) { - check_match(strstart - 1, prev_match, prev_length); - flush = ct_tally(strstart - 1 - prev_match, prev_length - MIN_MATCH); + if (G1.prev_length >= MIN_MATCH && match_length <= G1.prev_length) { + check_match(G1.strstart - 1, prev_match, G1.prev_length); + flush = ct_tally(G1.strstart - 1 - prev_match, G1.prev_length - MIN_MATCH); /* Insert in hash table all strings up to the end of the match. * strstart-1 and strstart are already inserted. */ - lookahead -= prev_length - 1; - prev_length -= 2; + G1.lookahead -= G1.prev_length - 1; + G1.prev_length -= 2; do { - strstart++; - INSERT_STRING(strstart, hash_head); + G1.strstart++; + INSERT_STRING(G1.strstart, hash_head); /* strstart never exceeds WSIZE-MAX_MATCH, so there are * always MIN_MATCH bytes ahead. If lookahead < MIN_MATCH * these bytes are garbage, but it does not matter since the * next lookahead bytes will always be emitted as literals. */ - } while (--prev_length != 0); + } while (--G1.prev_length != 0); match_available = 0; match_length = MIN_MATCH - 1; - strstart++; + G1.strstart++; if (flush) { FLUSH_BLOCK(0); - block_start = strstart; + G1.block_start = G1.strstart; } } else if (match_available) { /* If there was no match at the previous position, output a * single literal. If there was a match but the current match * is longer, truncate the previous match to a single literal. */ - Tracevv((stderr, "%c", window[strstart - 1])); - if (ct_tally(0, window[strstart - 1])) { + Tracevv((stderr, "%c", G1.window[G1.strstart - 1])); + if (ct_tally(0, G1.window[G1.strstart - 1])) { FLUSH_BLOCK(0); - block_start = strstart; + G1.block_start = G1.strstart; } - strstart++; - lookahead--; + G1.strstart++; + G1.lookahead--; } else { /* There is no previous match to compare with, wait for * the next step to decide. */ match_available = 1; - strstart++; - lookahead--; + G1.strstart++; + G1.lookahead--; } - Assert(strstart <= isize && lookahead <= isize, "a bit too far"); + Assert(G1.strstart <= G1.isize && lookahead <= G1.isize, "a bit too far"); /* Make sure that we always have enough lookahead, except * at the end of the input file. We need MAX_MATCH bytes * for the next match, plus MIN_MATCH bytes to insert the * string following the next match. */ - while (lookahead < MIN_LOOKAHEAD && !eofile) + while (G1.lookahead < MIN_LOOKAHEAD && !G1.eofile) fill_window(); } if (match_available) - ct_tally(0, window[strstart - 1]); + ct_tally(0, G1.window[G1.strstart - 1]); return FLUSH_BLOCK(1); /* eof */ } /* =========================================================================== - * Deflate in to out. - * IN assertions: the input and output buffers are cleared. - * The variables time_stamp and save_orig_name are initialized. + * Initialize the bit string routines. */ -static int zip(int in, int out) +static void bi_init(void) { - uch my_flags = 0; /* general purpose bit flags */ - ush attr = 0; /* ascii/binary flag */ - ush deflate_flags = 0; /* pkzip -es, -en or -ex equivalent */ + G1.bi_buf = 0; + G1.bi_valid = 0; +#ifdef DEBUG + G1.bits_sent = 0L; +#endif +} - ifd = in; - ofd = out; - outcnt = 0; - /* Write the header to the gzip file. See algorithm.doc for the format */ +/* =========================================================================== + * Initialize the "longest match" routines for a new file + */ +static void lm_init(ush * flagsp) +{ + unsigned j; - method = DEFLATED; - put_header_byte(0x1f); /* magic header for gzip files, 1F 8B */ - put_header_byte(0x8b); + /* Initialize the hash table. */ + memset(head, 0, HASH_SIZE * sizeof(*head)); + /* prev will be initialized on the fly */ + + /* speed options for the general purpose bit flag */ + *flagsp |= 2; /* FAST 4, SLOW 2 */ + /* ??? reduce max_chain_length for binary files */ - put_header_byte(DEFLATED); /* compression method */ + G1.strstart = 0; + G1.block_start = 0L; - put_header_byte(my_flags); /* general flags */ + G1.lookahead = file_read(G1.window, + sizeof(int) <= 2 ? (unsigned) WSIZE : 2 * WSIZE); + + if (G1.lookahead == 0 || G1.lookahead == (unsigned) -1) { + G1.eofile = 1; + G1.lookahead = 0; + return; + } + G1.eofile = 0; + /* Make sure that we always have enough lookahead. This is important + * if input comes from a device such as a tty. + */ + while (G1.lookahead < MIN_LOOKAHEAD && !G1.eofile) + fill_window(); + + G1.ins_h = 0; + for (j = 0; j < MIN_MATCH - 1; j++) + UPDATE_HASH(G1.ins_h, G1.window[j]); + /* If lookahead < MIN_MATCH, ins_h is garbage, but this is + * not important since only literal bytes will be emitted. + */ +} + + +/* =========================================================================== + * Allocate the match buffer, initialize the various tables and save the + * location of the internal file attribute (ascii/binary) and method + * (DEFLATE/STORE). + * One callsite in zip() + */ +static void ct_init(void) +{ + int n; /* iterates over tree elements */ + int length; /* length value */ + int code; /* code value */ + int dist; /* distance index */ + + G2.compressed_len = 0L; + +#ifdef NOT_NEEDED + if (G2.static_dtree[0].Len != 0) + return; /* ct_init already called */ +#endif + + /* Initialize the mapping length (0..255) -> length code (0..28) */ + length = 0; + for (code = 0; code < LENGTH_CODES - 1; code++) { + G2.base_length[code] = length; + for (n = 0; n < (1 << extra_lbits[code]); n++) { + G2.length_code[length++] = code; + } + } + Assert(length == 256, "ct_init: length != 256"); + /* Note that the length 255 (match length 258) can be represented + * in two different ways: code 284 + 5 bits or code 285, so we + * overwrite length_code[255] to use the best encoding: + */ + G2.length_code[length - 1] = code; + + /* Initialize the mapping dist (0..32K) -> dist code (0..29) */ + dist = 0; + for (code = 0; code < 16; code++) { + G2.base_dist[code] = dist; + for (n = 0; n < (1 << extra_dbits[code]); n++) { + G2.dist_code[dist++] = code; + } + } + Assert(dist == 256, "ct_init: dist != 256"); + dist >>= 7; /* from now on, all distances are divided by 128 */ + for (; code < D_CODES; code++) { + G2.base_dist[code] = dist << 7; + for (n = 0; n < (1 << (extra_dbits[code] - 7)); n++) { + G2.dist_code[256 + dist++] = code; + } + } + Assert(dist == 256, "ct_init: 256+dist != 512"); + + /* Construct the codes of the static literal tree */ + /* already zeroed - it's in bss + for (n = 0; n <= MAX_BITS; n++) + G2.bl_count[n] = 0; */ + + n = 0; + while (n <= 143) { + G2.static_ltree[n++].Len = 8; + G2.bl_count[8]++; + } + while (n <= 255) { + G2.static_ltree[n++].Len = 9; + G2.bl_count[9]++; + } + while (n <= 279) { + G2.static_ltree[n++].Len = 7; + G2.bl_count[7]++; + } + while (n <= 287) { + G2.static_ltree[n++].Len = 8; + G2.bl_count[8]++; + } + /* Codes 286 and 287 do not exist, but we must include them in the + * tree construction to get a canonical Huffman tree (longest code + * all ones) + */ + gen_codes((ct_data *) G2.static_ltree, L_CODES + 1); + + /* The static distance tree is trivial: */ + for (n = 0; n < D_CODES; n++) { + G2.static_dtree[n].Len = 5; + G2.static_dtree[n].Code = bi_reverse(n, 5); + } + + /* Initialize the first block of the first file: */ + init_block(); +} + + +/* =========================================================================== + * Deflate in to out. + * IN assertions: the input and output buffers are cleared. + */ + +static void zip(ulg time_stamp) +{ + ush deflate_flags = 0; /* pkzip -es, -en or -ex equivalent */ + + G1.outcnt = 0; + + /* Write the header to the gzip file. See algorithm.doc for the format */ + /* magic header for gzip files: 1F 8B */ + /* compression method: 8 (DEFLATED) */ + /* general flags: 0 */ + put_32bit(0x00088b1f); put_32bit(time_stamp); /* Write deflated file to zip file */ - crc = ~0; + G1.crc = ~0; - bi_init(out); - ct_init(&attr, &method); + bi_init(); + ct_init(); lm_init(&deflate_flags); put_8bit(deflate_flags); /* extra flags */ @@ -2085,153 +1998,123 @@ static int zip(int in, int out) deflate(); /* Write the crc and uncompressed size */ - put_32bit(~crc); - put_32bit(isize); + put_32bit(~G1.crc); + put_32bit(G1.isize); flush_outbuf(); - return 0; } /* ======================================================================== */ -static void abort_gzip(int ATTRIBUTE_UNUSED ignored) +static +IF_DESKTOP(long long) int FAST_FUNC pack_gzip(unpack_info_t *info UNUSED_PARAM) { - exit(1); -} - -int gzip_main(int argc, char **argv) -{ - enum { - OPT_tostdout = 0x1, - OPT_force = 0x2, - }; + struct stat s; - unsigned opt; - int result; - int inFileNum; - int outFileNum; - int i; - struct stat statBuf; - char *delFileName; - - opt = getopt32(argc, argv, "cf123456789qv" USE_GUNZIP("d")); - //if (opt & 0x1) // -c - //if (opt & 0x2) // -f - /* Ignore 1-9 (compression level) options */ - //if (opt & 0x4) // -1 - //if (opt & 0x8) // -2 - //if (opt & 0x10) // -3 - //if (opt & 0x20) // -4 - //if (opt & 0x40) // -5 - //if (opt & 0x80) // -6 - //if (opt & 0x100) // -7 - //if (opt & 0x200) // -8 - //if (opt & 0x400) // -9 - //if (opt & 0x800) // -q - //if (opt & 0x1000) // -v -#if ENABLE_GUNZIP /* gunzip_main may not be visible... */ - if (opt & 0x2000) { // -d - /* FIXME: getopt32 should not depend on optind */ - optind = 1; - return gunzip_main(argc, argv); - } + /* Clear input and output buffers */ + G1.outcnt = 0; +#ifdef DEBUG + G1.insize = 0; #endif + G1.isize = 0; + + /* Reinit G2.xxx */ + memset(&G2, 0, sizeof(G2)); + G2.l_desc.dyn_tree = G2.dyn_ltree; + G2.l_desc.static_tree = G2.static_ltree; + G2.l_desc.extra_bits = extra_lbits; + G2.l_desc.extra_base = LITERALS + 1; + G2.l_desc.elems = L_CODES; + G2.l_desc.max_length = MAX_BITS; + //G2.l_desc.max_code = 0; + G2.d_desc.dyn_tree = G2.dyn_dtree; + G2.d_desc.static_tree = G2.static_dtree; + G2.d_desc.extra_bits = extra_dbits; + //G2.d_desc.extra_base = 0; + G2.d_desc.elems = D_CODES; + G2.d_desc.max_length = MAX_BITS; + //G2.d_desc.max_code = 0; + G2.bl_desc.dyn_tree = G2.bl_tree; + //G2.bl_desc.static_tree = NULL; + G2.bl_desc.extra_bits = extra_blbits, + //G2.bl_desc.extra_base = 0; + G2.bl_desc.elems = BL_CODES; + G2.bl_desc.max_length = MAX_BL_BITS; + //G2.bl_desc.max_code = 0; + + s.st_ctime = 0; + fstat(STDIN_FILENO, &s); + zip(s.st_ctime); + return 0; +} - foreground = signal(SIGINT, SIG_IGN) != SIG_IGN; - if (foreground) { - signal(SIGINT, abort_gzip); - } -#ifdef SIGTERM - if (signal(SIGTERM, SIG_IGN) != SIG_IGN) { - signal(SIGTERM, abort_gzip); - } +#if ENABLE_FEATURE_GZIP_LONG_OPTIONS +static const char gzip_longopts[] ALIGN1 = + "stdout\0" No_argument "c" + "to-stdout\0" No_argument "c" + "force\0" No_argument "f" + "verbose\0" No_argument "v" +#if ENABLE_GUNZIP + "decompress\0" No_argument "d" + "uncompress\0" No_argument "d" + "test\0" No_argument "t" #endif -#ifdef SIGHUP - if (signal(SIGHUP, SIG_IGN) != SIG_IGN) { - signal(SIGHUP, abort_gzip); - } + "quiet\0" No_argument "q" + "fast\0" No_argument "1" + "best\0" No_argument "9" + ; #endif - strncpy(z_suffix, ".gz", sizeof(z_suffix) - 1); - - /* Allocate all global buffers (for DYN_ALLOC option) */ - ALLOC(uch, inbuf, INBUFSIZ + INBUF_EXTRA); - ALLOC(uch, outbuf, OUTBUFSIZ + OUTBUF_EXTRA); - ALLOC(ush, d_buf, DIST_BUFSIZE); - ALLOC(uch, window, 2L * WSIZE); - ALLOC(ush, prev, 1L << BITS); - - /* Initialise the CRC32 table */ - crc_32_tab = crc32_filltable(0); - - clear_bufs(); - - if (optind == argc) { - time_stamp = 0; - zip(STDIN_FILENO, STDOUT_FILENO); - return exit_code; - } - - for (i = optind; i < argc; i++) { - char *path = NULL; - - clear_bufs(); - if (LONE_DASH(argv[i])) { - time_stamp = 0; - inFileNum = STDIN_FILENO; - outFileNum = STDOUT_FILENO; - } else { - inFileNum = xopen(argv[i], O_RDONLY); - if (fstat(inFileNum, &statBuf) < 0) - bb_perror_msg_and_die("%s", argv[i]); - time_stamp = statBuf.st_ctime; - - if (!(opt & OPT_tostdout)) { - path = xasprintf("%s.gz", argv[i]); - - /* Open output file */ -#if defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1 && defined(O_NOFOLLOW) - outFileNum = open(path, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW); +/* + * Linux kernel build uses gzip -d -n. We accept and ignore -n. + * Man page says: + * -n --no-name + * gzip: do not save the original file name and time stamp. + * (The original name is always saved if the name had to be truncated.) + * gunzip: do not restore the original file name/time even if present + * (remove only the gzip suffix from the compressed file name). + * This option is the default when decompressing. + * -N --name + * gzip: always save the original file name and time stamp (this is the default) + * gunzip: restore the original file name and time stamp if present. + */ + +int gzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +#if ENABLE_GUNZIP +int gzip_main(int argc, char **argv) #else - outFileNum = open(path, O_RDWR | O_CREAT | O_EXCL); +int gzip_main(int argc UNUSED_PARAM, char **argv) #endif - if (outFileNum < 0) { - bb_perror_msg("%s", path); - free(path); - continue; - } - - /* Set permissions on the file */ - fchmod(outFileNum, statBuf.st_mode); - } else - outFileNum = STDOUT_FILENO; - } - - if (path == NULL && isatty(outFileNum) && !(opt & OPT_force)) { - bb_error_msg("compressed data not written " - "to a terminal. Use -f to force compression."); - free(path); - continue; - } - - result = zip(inFileNum, outFileNum); +{ + unsigned opt; - if (path != NULL) { - close(inFileNum); - close(outFileNum); +#if ENABLE_FEATURE_GZIP_LONG_OPTIONS + applet_long_options = gzip_longopts; +#endif + /* Must match bbunzip's constants OPT_STDOUT, OPT_FORCE! */ + opt = getopt32(argv, "cfv" IF_GUNZIP("dt") "q123456789n"); +#if ENABLE_GUNZIP /* gunzip_main may not be visible... */ + if (opt & 0x18) // -d and/or -t + return gunzip_main(argc, argv); +#endif + option_mask32 &= 0x7; /* ignore -q, -0..9 */ + //if (opt & 0x1) // -c + //if (opt & 0x2) // -f + //if (opt & 0x4) // -v + argv += optind; - /* Delete the original file */ - if (result == 0) - delFileName = argv[i]; - else - delFileName = path; + SET_PTR_TO_GLOBALS((char *)xzalloc(sizeof(struct globals)+sizeof(struct globals2)) + + sizeof(struct globals)); - if (unlink(delFileName) < 0) - bb_perror_msg("%s", delFileName); - } + /* Allocate all global buffers (for DYN_ALLOC option) */ + ALLOC(uch, G1.l_buf, INBUFSIZ); + ALLOC(uch, G1.outbuf, OUTBUFSIZ); + ALLOC(ush, G1.d_buf, DIST_BUFSIZE); + ALLOC(uch, G1.window, 2L * WSIZE); + ALLOC(ush, G1.prev, 1L << BITS); - free(path); - } + /* Initialize the CRC32 table */ + global_crc32_table = crc32_filltable(NULL, 0); - return exit_code; + return bbunpack(argv, pack_gzip, append_ext, "gz"); }