diff options
Diffstat (limited to 'archival/gzip.c')
| -rw-r--r-- | archival/gzip.c | 333 |
1 files changed, 145 insertions, 188 deletions
diff --git a/archival/gzip.c b/archival/gzip.c index b8a4484..c441942 100644 --- a/archival/gzip.c +++ b/archival/gzip.c @@ -25,45 +25,15 @@ aa: 85.1% -- replaced with aa.gz #define SMALL_MEM -#include <stdlib.h> -#include <stdio.h> -#include <string.h> -#include <unistd.h> -#include <errno.h> -#include <sys/types.h> -#include <signal.h> -#include <utime.h> -#include <ctype.h> -#include <sys/types.h> -#include <unistd.h> -#include <dirent.h> -#include <fcntl.h> -#include <time.h> +//#include <dirent.h> #include "busybox.h" -typedef unsigned char uch; -typedef unsigned short ush; -typedef unsigned long ulg; - -/* Return codes from gzip */ -#define OK 0 -#define ERROR 1 -#define WARNING 2 - /* 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 -/* 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 - * For compression, input is done in window[]. For decompression, output - * is done in window except for unlzw. - */ - #ifndef INBUFSIZ # ifdef SMALL_MEM # define INBUFSIZ 0x2000 /* input buffer size */ @@ -71,6 +41,7 @@ typedef unsigned long ulg; # define INBUFSIZ 0x8000 /* input buffer size */ # endif #endif + #define INBUF_EXTRA 64 /* required by unlzw() */ #ifndef OUTBUFSIZ @@ -90,21 +61,8 @@ typedef unsigned long ulg; # endif #endif -# 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;} - -#define tab_suffix window -#define tab_prefix prev /* hash link (see deflate.c) */ -#define head (prev+WSIZE) /* hash head (see deflate.c) */ - -static long isize; /* number of input bytes */ - #define NO_FILE (-1) /* in memory compression */ - #define PACK_MAGIC "\037\036" /* Magic header for packed files */ #define GZIP_MAGIC "\037\213" /* Magic header for gzip files, 1F 8B */ #define OLD_GZIP_MAGIC "\037\236" /* Magic header for gzip 0.5 = freeze 1.x */ @@ -142,37 +100,66 @@ static long isize; /* number of input bytes */ * distances are limited to MAX_DIST instead of WSIZE. */ -/* put_byte is used for the compressed output */ -#define put_byte(c) {outbuf[outcnt++]=(uch)(c); if (outcnt==OUTBUFSIZ)\ - flush_outbuf();} +#ifndef MAX_PATH_LEN +# define MAX_PATH_LEN 1024 /* max pathname length */ +#endif #define seekable() 0 /* force sequential output */ #define translate_eol 0 /* no option -a yet */ -/* Diagnostic functions */ -#ifdef DEBUG -# 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 ;} +#ifndef BITS +# define BITS 16 +#endif +#define INIT_BITS 9 /* Initial number of bits per code */ + +#define BIT_MASK 0x1f /* Mask for 'number of compression bits' */ +/* Mask 0x20 is reserved to mean a fourth header byte, and 0x40 is free. + * It's a pity that old uncompress does not check bit 0x20. That makes + * extension of the format actually undesirable because old compress + * would just crash on the new format instead of giving a meaningful + * error message. It does check the number of bits, but it's more + * helpful to say "unsupported format, get a new version" than + * "can only handle 16 bits". + */ + +#ifdef MAX_EXT_CHARS +# define MAX_SUFFIX MAX_EXT_CHARS #else -# define Assert(cond,msg) -# define Trace(x) -# define Tracev(x) -# define Tracevv(x) -# define Tracec(c,x) -# define Tracecv(c,x) +# define MAX_SUFFIX 30 #endif -#define WARN(msg) {if (!quiet) fprintf msg ; \ - if (exit_code == OK) exit_code = WARNING;} -#ifndef MAX_PATH_LEN -# define MAX_PATH_LEN 1024 /* max pathname length */ +#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; \ +} + +/* Diagnostic functions */ +#ifdef DEBUG +# 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 ;} +#else +# define Assert(cond,msg) +# define Trace(x) +# define Tracev(x) +# define Tracevv(x) +# define Tracec(c,x) +# define Tracecv(c,x) #endif +typedef unsigned char uch; +typedef unsigned short ush; +typedef unsigned long ulg; + /* from zip.c: */ static int zip(int in, int out); @@ -195,66 +182,22 @@ static void bi_windup(void); static void copy_block(char *buf, unsigned len, int header); static int (*read_buf) (char *buf, unsigned size); - /* from util.c: */ static void flush_outbuf(void); -/* lzw.h -- define the lzw functions. - * Copyright (C) 1992-1993 Jean-loup Gailly. - * This is free software; you can redistribute it and/or modify it under the - * terms of the GNU General Public License, see the file COPYING. - */ +/* global buffers */ -#ifndef BITS -# define BITS 16 -#endif -#define INIT_BITS 9 /* Initial number of bits per code */ - -#define BIT_MASK 0x1f /* Mask for 'number of compression bits' */ -/* Mask 0x20 is reserved to mean a fourth header byte, and 0x40 is free. - * It's a pity that old uncompress does not check bit 0x20. That makes - * extension of the format actually undesirable because old compress - * would just crash on the new format instead of giving a meaningful - * error message. It does check the number of bits, but it's more - * helpful to say "unsupported format, get a new version" than - * "can only handle 16 bits". - */ - -/* tailor.h -- target dependent definitions - * Copyright (C) 1992-1993 Jean-loup Gailly. - * This is free software; you can redistribute it and/or modify it under the - * terms of the GNU General Public License, see the file COPYING. - */ - -/* The target dependent definitions should be defined here only. - * The target dependent functions should be defined in tailor.c. +/* 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 + * For compression, input is done in window[]. For decompression, output + * is done in window except for unlzw. */ - /* Common defaults */ - -#ifndef OS_CODE -# define OS_CODE 0x03 /* assume Unix */ -#endif - -#ifndef PATH_SEP -# define PATH_SEP '/' -#endif - -#ifndef OPTIONS_VAR -# define OPTIONS_VAR "GZIP" -#endif - -#ifndef Z_SUFFIX -# define Z_SUFFIX ".gz" -#endif - -#ifdef MAX_EXT_CHARS -# define MAX_SUFFIX MAX_EXT_CHARS -#else -# define MAX_SUFFIX 30 -#endif - - /* global buffers */ +#define tab_suffix window +#define tab_prefix prev /* hash link (see deflate.c) */ +#define head (prev+WSIZE) /* hash head (see deflate.c) */ DECLARE(uch, inbuf, INBUFSIZ + INBUF_EXTRA); DECLARE(uch, outbuf, OUTBUFSIZ + OUTBUF_EXTRA); @@ -262,10 +205,12 @@ DECLARE(ush, d_buf, DIST_BUFSIZE); DECLARE(uch, window, 2L * WSIZE); DECLARE(ush, tab_prefix, 1L << BITS); -static int foreground; /* set if program run in foreground */ +static long isize; /* number of input bytes */ + +static int foreground; /* set if program run in foreground */ static int method = DEFLATED; /* compression method */ -static int exit_code = OK; /* program exit code */ -static long time_stamp; /* original time stamp (modification time) */ +static int exit_code; /* program exit code */ +static long time_stamp; /* original time stamp (modification time) */ static char z_suffix[MAX_SUFFIX + 1]; /* default suffix (can be set with --suffix) */ static int ifd; /* input file descriptor */ @@ -277,24 +222,67 @@ static unsigned outcnt; /* bytes in output buffer */ static uint32_t *crc_32_tab; + +/* =========================================================================== + * Local data used by the "bit string" routines. + */ + +static int zfile; /* output gzip file */ + +static unsigned short bi_buf; + +/* Output buffer. bits are inserted starting at the bottom (least significant + * bits). + */ + +#undef BUF_SIZE +#define BUF_SIZE (8 * sizeof(bi_buf)) +/* Number of bits used within bi_buf. (bi_buf might be implemented on + * more than 16 bits on some systems.) + */ + +static int bi_valid; + +/* Current input function. Set to mem_read for in-memory compression */ + +#ifdef DEBUG +static ulg bits_sent; /* bit length of the compressed data */ +#endif + + +/* =========================================================================== + */ +/* put_8bit is used for the compressed output */ +#define put_8bit(c) \ +{ \ + outbuf[outcnt++] = (c); \ + if (outcnt == OUTBUFSIZ) flush_outbuf(); \ +} + /* Output a 16 bit value, lsb first */ -static void put_short(ush w) +static void put_16bit(ush w) { if (outcnt < OUTBUFSIZ - 2) { - outbuf[outcnt++] = (uch) ((w) & 0xff); - outbuf[outcnt++] = (uch) ((ush) (w) >> 8); + outbuf[outcnt++] = w; + outbuf[outcnt++] = w >> 8; } else { - put_byte((uch) ((w) & 0xff)); - put_byte((uch) ((ush) (w) >> 8)); + put_8bit(w); + put_8bit(w >> 8); } } -/* ======================================================================== - * Signal and error handler. - */ -static void abort_gzip(int ATTRIBUTE_UNUSED ignored) +static void put_32bit(ulg n) { - exit(ERROR); + put_16bit(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); \ } /* =========================================================================== @@ -318,7 +306,8 @@ static void write_buf(int fd, void *buf, unsigned cnt) unsigned n; while ((n = write(fd, buf, cnt)) != cnt) { - if (n == (unsigned) (-1)) bb_error_msg_and_die(bb_msg_write_error); + if (n == (unsigned) (-1)) + bb_error_msg_and_die(bb_msg_write_error); cnt -= n; buf = (void *) ((char *) buf + n); } @@ -401,31 +390,6 @@ static uint32_t updcrc(uch * s, unsigned n) */ /* =========================================================================== - * Local data used by the "bit string" routines. - */ - -static int zfile; /* output gzip file */ - -static unsigned short bi_buf; - -/* Output buffer. bits are inserted starting at the bottom (least significant - * bits). - */ - -#define Buf_size (8 * 2*sizeof(char)) -/* Number of bits used within bi_buf. (bi_buf might be implemented on - * more than 16 bits on some systems.) - */ - -static int bi_valid; - -/* Current input function. Set to mem_read for in-memory compression */ - -#ifdef DEBUG -ulg bits_sent; /* bit length of the compressed data */ -#endif - -/* =========================================================================== * Initialize the bit string routines. */ static void bi_init(int zipfile) @@ -460,11 +424,11 @@ static void send_bits(int value, int length) * (16 - bi_valid) bits from value, leaving (width - (16-bi_valid)) * unused bits in value. */ - if (bi_valid > (int) Buf_size - length) { + if (bi_valid > (int) BUF_SIZE - length) { bi_buf |= (value << bi_valid); - put_short(bi_buf); - bi_buf = (ush) value >> (Buf_size - bi_valid); - bi_valid += length - Buf_size; + put_16bit(bi_buf); + bi_buf = (ush) value >> (BUF_SIZE - bi_valid); + bi_valid += length - BUF_SIZE; } else { bi_buf |= value << bi_valid; bi_valid += length; @@ -493,9 +457,9 @@ static unsigned bi_reverse(unsigned code, int len) static void bi_windup(void) { if (bi_valid > 8) { - put_short(bi_buf); + put_16bit(bi_buf); } else if (bi_valid > 0) { - put_byte(bi_buf); + put_8bit(bi_buf); } bi_buf = 0; bi_valid = 0; @@ -513,8 +477,8 @@ static void copy_block(char *buf, unsigned len, int header) bi_windup(); /* align on byte boundary */ if (header) { - put_short((ush) len); - put_short((ush) ~ len); + put_16bit((ush) len); + put_16bit((ush) ~ len); #ifdef DEBUG bits_sent += 2 * 16; #endif @@ -523,7 +487,7 @@ static void copy_block(char *buf, unsigned len, int header) bits_sent += (ulg) len << 3; #endif while (len--) { - put_byte(*buf++); + put_8bit(*buf++); } } @@ -1039,8 +1003,7 @@ static ulg deflate(void) check_match(strstart - 1, prev_match, prev_length); - flush = - ct_tally(strstart - 1 - prev_match, prev_length - MIN_MATCH); + flush = ct_tally(strstart - 1 - prev_match, prev_length - MIN_MATCH); /* Insert in hash table all strings up to the end of the match. * strstart-1 and strstart are already inserted. @@ -1122,6 +1085,11 @@ static ulg deflate(void) typedef struct dirent dir_type; /* ======================================================================== */ +static void abort_gzip(int ATTRIBUTE_UNUSED ignored) +{ + exit(1); +} + int gzip_main(int argc, char **argv) { enum { @@ -1174,7 +1142,7 @@ int gzip_main(int argc, char **argv) } #endif - strncpy(z_suffix, Z_SUFFIX, sizeof(z_suffix) - 1); + strncpy(z_suffix, ".gz", sizeof(z_suffix) - 1); /* Allocate all global buffers (for DYN_ALLOC option) */ ALLOC(uch, inbuf, INBUFSIZ + INBUF_EXTRA); @@ -1244,7 +1212,7 @@ int gzip_main(int argc, char **argv) close(outFileNum); /* Delete the original file */ - if (result == OK) + if (result == 0) delFileName = argv[i]; else delFileName = path; @@ -2375,17 +2343,6 @@ static void set_file_type(void) static uint32_t crc; /* crc on uncompressed file data */ -static void put_long(ulg n) -{ - put_short((n) & 0xffff); - put_short(((ulg) (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++]=(uch)(c);} - /* =========================================================================== * Deflate in to out. * IN assertions: the input and output buffers are cleared. @@ -2409,7 +2366,7 @@ static int zip(int in, int out) put_header_byte(DEFLATED); /* compression method */ put_header_byte(my_flags); /* general flags */ - put_long(time_stamp); + put_32bit(time_stamp); /* Write deflated file to zip file */ crc = updcrc(0, 0); @@ -2418,17 +2375,17 @@ static int zip(int in, int out) ct_init(&attr, &method); lm_init(&deflate_flags); - put_byte((uch) deflate_flags); /* extra flags */ - put_byte(OS_CODE); /* OS identifier */ + put_8bit((uch) deflate_flags); /* extra flags */ + put_8bit(3); /* OS identifier = 3 (Unix) */ (void) deflate(); /* Write the crc and uncompressed size */ - put_long(crc); - put_long(isize); + put_32bit(crc); + put_32bit(isize); flush_outbuf(); - return OK; + return 0; } |