Add functions that were shared with gunzip.c, gunzip about to change.
This commit is contained in:
Glenn L McGrath
parent
a2e68fc233
commit
f58efb57d1
129
archival/gzip.c
129
archival/gzip.c
@ -42,6 +42,7 @@
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include "busybox.h"
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#define BB_DECLARE_EXTERN
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#define bb_need_memory_exhausted
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@ -72,7 +73,7 @@ typedef unsigned long ulg;
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/* methods 4 to 7 reserved */
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#define DEFLATED 8
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#define MAX_METHODS 9
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extern int method; /* compression method */
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static int method; /* compression method */
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/* To save memory for 16 bit systems, some arrays are overlaid between
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* the various modules:
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@ -143,7 +144,7 @@ EXTERN(ush, tab_prefix1); /* prefix for odd codes */
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#endif
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extern unsigned insize; /* valid bytes in inbuf */
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extern unsigned inptr; /* index of next byte to be processed in inbuf */
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static unsigned inptr; /* index of next byte to be processed in inbuf */
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extern unsigned outcnt; /* bytes in output buffer */
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extern long bytes_in; /* number of input bytes */
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@ -308,16 +309,16 @@ extern int (*read_buf) (char *buf, unsigned size);
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/* in util.c: */
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extern int copy (int in, int out);
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extern ulg updcrc (uch * s, unsigned n);
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extern void clear_bufs (void);
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//extern ulg updcrc (uch * s, unsigned n);
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//extern void clear_bufs (void);
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extern int fill_inbuf (int eof_ok);
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extern void flush_outbuf (void);
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extern void flush_window (void);
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extern void write_buf (int fd, void * buf, unsigned cnt);
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//extern void write_buf (int fd, void * buf, unsigned cnt);
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extern char *strlwr (char *s);
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extern char *add_envopt (int *argcp, char ***argvp, char *env);
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extern void read_error_msg (void);
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extern void write_error_msg (void);
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//extern void read_error_msg (void);
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//extern void write_error_msg (void);
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extern void display_ratio (long num, long den, FILE * file);
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/* in inflate.c */
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@ -704,6 +705,120 @@ extern void _expand_args(int *argc, char ***argv);
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#ifndef put_char
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# define put_char(c) put_byte(c)
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#endif
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int crc_table_empty = 1;
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/* ========================================================================
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* Signal and error handler.
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*/
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void abort_gzip()
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{
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exit(ERROR);
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}
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/* ===========================================================================
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* Clear input and output buffers
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*/
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static void clear_bufs(void)
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{
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outcnt = 0;
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insize = inptr = 0;
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bytes_in = bytes_out = 0L;
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}
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static void write_error_msg()
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{
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fprintf(stderr, "\n");
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perror("");
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abort_gzip();
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}
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/* ===========================================================================
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* Does the same as write(), but also handles partial pipe writes and checks
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* for error return.
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*/
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static void write_buf(fd, buf, cnt)
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int fd;
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void * buf;
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unsigned cnt;
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{
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unsigned n;
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while ((n = write(fd, buf, cnt)) != cnt) {
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if (n == (unsigned) (-1)) {
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write_error_msg();
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}
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cnt -= n;
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buf = (void *) ((char *) buf + n);
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}
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}
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/* ========================================================================
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* Error handlers.
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*/
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static void read_error_msg()
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{
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fprintf(stderr, "\n");
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if (errno != 0) {
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perror("");
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} else {
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fprintf(stderr, "unexpected end of file\n");
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}
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abort_gzip();
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}
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/* ===========================================================================
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* Run a set of bytes through the crc shift register. If s is a NULL
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* pointer, then initialize the crc shift register contents instead.
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* Return the current crc in either case.
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*/
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static ulg updcrc(s, n)
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uch *s; /* pointer to bytes to pump through */
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unsigned n; /* number of bytes in s[] */
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{
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static ulg crc = (ulg) 0xffffffffL; /* shift register contents */
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register ulg c; /* temporary variable */
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static unsigned long crc_32_tab[256];
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if (crc_table_empty) {
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unsigned long csr; /* crc shift register */
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unsigned long e; /* polynomial exclusive-or pattern */
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int i; /* counter for all possible eight bit values */
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int k; /* byte being shifted into crc apparatus */
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/* terms of polynomial defining this crc (except x^32): */
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static int p[] = {0,1,2,4,5,7,8,10,11,12,16,22,23,26};
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/* Make exclusive-or pattern from polynomial (0xedb88320) */
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e = 0;
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for (i = 0; i < sizeof(p)/sizeof(int); i++)
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e |= 1L << (31 - p[i]);
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/* Compute and print table of CRC's, five per line */
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crc_32_tab[0] = 0x00000000L;
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for (i = 1; i < 256; i++) {
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csr = i;
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/* The idea to initialize the register with the byte instead of
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* zero was stolen from Haruhiko Okumura's ar002
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*/
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for (k = 8; k; k--)
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csr = csr & 1 ? (csr >> 1) ^ e : csr >> 1;
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crc_32_tab[i]=csr;
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}
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}
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if (s == NULL) {
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c = 0xffffffffL;
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} else {
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c = crc;
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if (n)
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do {
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c = crc_32_tab[((int) c ^ (*s++)) & 0xff] ^ (c >> 8);
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} while (--n);
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}
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crc = c;
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return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */
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}
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/* bits.c -- output variable-length bit strings
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* Copyright (C) 1992-1993 Jean-loup Gailly
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* This is free software; you can redistribute it and/or modify it under the
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129
gzip.c
129
gzip.c
@ -42,6 +42,7 @@
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include "busybox.h"
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#define BB_DECLARE_EXTERN
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#define bb_need_memory_exhausted
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@ -72,7 +73,7 @@ typedef unsigned long ulg;
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/* methods 4 to 7 reserved */
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#define DEFLATED 8
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#define MAX_METHODS 9
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extern int method; /* compression method */
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static int method; /* compression method */
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/* To save memory for 16 bit systems, some arrays are overlaid between
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* the various modules:
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@ -143,7 +144,7 @@ EXTERN(ush, tab_prefix1); /* prefix for odd codes */
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#endif
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extern unsigned insize; /* valid bytes in inbuf */
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extern unsigned inptr; /* index of next byte to be processed in inbuf */
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static unsigned inptr; /* index of next byte to be processed in inbuf */
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extern unsigned outcnt; /* bytes in output buffer */
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extern long bytes_in; /* number of input bytes */
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@ -308,16 +309,16 @@ extern int (*read_buf) (char *buf, unsigned size);
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/* in util.c: */
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extern int copy (int in, int out);
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extern ulg updcrc (uch * s, unsigned n);
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extern void clear_bufs (void);
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//extern ulg updcrc (uch * s, unsigned n);
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//extern void clear_bufs (void);
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extern int fill_inbuf (int eof_ok);
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extern void flush_outbuf (void);
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extern void flush_window (void);
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extern void write_buf (int fd, void * buf, unsigned cnt);
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//extern void write_buf (int fd, void * buf, unsigned cnt);
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extern char *strlwr (char *s);
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extern char *add_envopt (int *argcp, char ***argvp, char *env);
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extern void read_error_msg (void);
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extern void write_error_msg (void);
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//extern void read_error_msg (void);
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//extern void write_error_msg (void);
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extern void display_ratio (long num, long den, FILE * file);
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/* in inflate.c */
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@ -704,6 +705,120 @@ extern void _expand_args(int *argc, char ***argv);
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#ifndef put_char
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# define put_char(c) put_byte(c)
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#endif
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int crc_table_empty = 1;
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/* ========================================================================
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* Signal and error handler.
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*/
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void abort_gzip()
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{
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exit(ERROR);
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}
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/* ===========================================================================
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* Clear input and output buffers
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*/
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static void clear_bufs(void)
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{
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outcnt = 0;
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insize = inptr = 0;
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bytes_in = bytes_out = 0L;
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}
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static void write_error_msg()
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{
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fprintf(stderr, "\n");
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perror("");
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abort_gzip();
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}
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/* ===========================================================================
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* Does the same as write(), but also handles partial pipe writes and checks
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* for error return.
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*/
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static void write_buf(fd, buf, cnt)
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int fd;
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void * buf;
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unsigned cnt;
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{
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unsigned n;
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while ((n = write(fd, buf, cnt)) != cnt) {
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if (n == (unsigned) (-1)) {
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write_error_msg();
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}
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cnt -= n;
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buf = (void *) ((char *) buf + n);
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}
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}
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/* ========================================================================
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* Error handlers.
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*/
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static void read_error_msg()
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{
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fprintf(stderr, "\n");
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if (errno != 0) {
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perror("");
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} else {
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fprintf(stderr, "unexpected end of file\n");
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}
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abort_gzip();
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}
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/* ===========================================================================
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* Run a set of bytes through the crc shift register. If s is a NULL
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* pointer, then initialize the crc shift register contents instead.
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* Return the current crc in either case.
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*/
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static ulg updcrc(s, n)
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uch *s; /* pointer to bytes to pump through */
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unsigned n; /* number of bytes in s[] */
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{
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static ulg crc = (ulg) 0xffffffffL; /* shift register contents */
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register ulg c; /* temporary variable */
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static unsigned long crc_32_tab[256];
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if (crc_table_empty) {
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unsigned long csr; /* crc shift register */
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unsigned long e; /* polynomial exclusive-or pattern */
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int i; /* counter for all possible eight bit values */
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int k; /* byte being shifted into crc apparatus */
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/* terms of polynomial defining this crc (except x^32): */
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static int p[] = {0,1,2,4,5,7,8,10,11,12,16,22,23,26};
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/* Make exclusive-or pattern from polynomial (0xedb88320) */
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e = 0;
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for (i = 0; i < sizeof(p)/sizeof(int); i++)
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e |= 1L << (31 - p[i]);
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/* Compute and print table of CRC's, five per line */
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crc_32_tab[0] = 0x00000000L;
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for (i = 1; i < 256; i++) {
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csr = i;
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/* The idea to initialize the register with the byte instead of
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* zero was stolen from Haruhiko Okumura's ar002
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*/
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for (k = 8; k; k--)
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csr = csr & 1 ? (csr >> 1) ^ e : csr >> 1;
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crc_32_tab[i]=csr;
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}
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}
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if (s == NULL) {
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c = 0xffffffffL;
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} else {
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c = crc;
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if (n)
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do {
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c = crc_32_tab[((int) c ^ (*s++)) & 0xff] ^ (c >> 8);
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} while (--n);
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}
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crc = c;
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return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */
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}
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/* bits.c -- output variable-length bit strings
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* Copyright (C) 1992-1993 Jean-loup Gailly
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* This is free software; you can redistribute it and/or modify it under the
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