1 /* gzip.c - gzip/gunzip/zcat
2 *
3 * Copyright 2017 The Android Open Source Project
4 *
5 * See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/gzip.html
6 * GZIP RFC: http://www.ietf.org/rfc/rfc1952.txt
7 *
8 * todo: qtv --rsyncable
9
10 // gzip.net version allows all options for all commands.
11 USE_GZIP(NEWTOY(gzip, "ncdfk123456789[-123456789]", TOYFLAG_USR|TOYFLAG_BIN))
12 USE_GUNZIP(NEWTOY(gunzip, "cdfk123456789[-123456789]", TOYFLAG_USR|TOYFLAG_BIN))
13 USE_ZCAT(NEWTOY(zcat, "cdfk123456789[-123456789]", TOYFLAG_USR|TOYFLAG_BIN))
14
15 config GZIP
16 bool "gzip"
17 default n
18 help
19 usage: gzip [-19cdfk] [FILE...]
20
21 Compress files. With no files, compresses stdin to stdout.
22 On success, the input files are removed and replaced by new
23 files with the .gz suffix.
24
25 -c Output to stdout
26 -d Decompress (act as gunzip)
27 -f Force: allow overwrite of output file
28 -k Keep input files (default is to remove)
29 -# Compression level 1-9 (1:fastest, 6:default, 9:best)
30
31 config GUNZIP
32 bool "gunzip"
33 default y
34 help
35 usage: gunzip [-cfk] [FILE...]
36
37 Decompress files. With no files, decompresses stdin to stdout.
38 On success, the input files are removed and replaced by new
39 files without the .gz suffix.
40
41 -c Output to stdout (act as zcat)
42 -f Force: allow read from tty
43 -k Keep input files (default is to remove)
44
45 config ZCAT
46 bool "zcat"
47 default y
48 help
49 usage: zcat [FILE...]
50
51 Decompress files to stdout. Like `gzip -dc`.
52
53 -f Force: allow read from tty
54 */
55
56 #define FORCE_FLAGS
57 #define FOR_gzip
58 #include "toys.h"
59
GLOBALS(int level;)60 GLOBALS(
61 int level;
62 )
63
64 // Use assembly optimized zlib code?
65 #if CFG_TOYBOX_LIBZ
66 #include <zlib.h>
67
68 // Read from in_fd, write to out_fd, decompress if dd else compress
69 static int do_deflate(int in_fd, int out_fd, int dd, int level)
70 {
71 int len, err = 0;
72 char *b = "r";
73 gzFile gz;
74
75 if (!dd) {
76 sprintf(b = toybuf, "w%d", level);
77 if (out_fd == 1) out_fd = xdup(out_fd);
78 }
79 if (!(gz = gzdopen(dd ? in_fd : out_fd, b))) perror_exit("gzdopen");
80 if (dd) {
81 while ((len = gzread(gz, toybuf, sizeof(toybuf))) > 0)
82 if (len != writeall(out_fd, toybuf, len)) break;
83 } else {
84 while ((len = read(in_fd, toybuf, sizeof(toybuf))) > 0)
85 if (len != gzwrite(gz, toybuf, len)) break;
86 }
87
88 err = !!len;
89 if (len>0 || err == Z_ERRNO) perror_msg(dd ? "write" : "read");
90 if (len<0)
91 error_msg("%s%s: %s", "gz", dd ? "read" : "write", gzerror(gz, &len));
92
93 if (gzclose(gz) != Z_OK) perror_msg("gzclose"), err++;
94
95 return err;
96 }
97
98 // Use toybox's builtin lib/deflate.c
99 #else
100
101 // Read from in_fd, write to out_fd, decompress if dd else compress
102 static int do_deflate(int in_fd, int out_fd, int dd, int level)
103 {
104 int x;
105
106 if (dd) WOULD_EXIT(x, gunzip_fd(in_fd, out_fd));
107 else WOULD_EXIT(x, gzip_fd(in_fd, out_fd));
108
109 return x;
110 }
111
112 #endif
113
do_gzip(int ifd,char * in)114 static void do_gzip(int ifd, char *in)
115 {
116 struct stat sb;
117 char *out = 0;
118 int ofd = 0;
119
120 // Are we writing to stdout?
121 if (!ifd || FLAG(c)) ofd = 1;
122 if (isatty(ifd)) {
123 if (!FLAG(f)) return error_msg("%s:need -f to read TTY"+3*!!ifd, in);
124 else ofd = 1;
125 }
126
127 // Are we reading file.gz to write to file?
128 if (!ofd) {
129 if (fstat(ifd, &sb)) return perror_msg("%s", in);
130
131 // Add or remove .gz suffix as necessary
132 if (!FLAG(d)) out = xmprintf("%s%s", in, ".gz");
133 else if ((out = strend(in, ".gz"))>in) out = xstrndup(in, out-in);
134 else return error_msg("no .gz: %s", in);
135
136 ofd = xcreate(out, O_CREAT|O_WRONLY|WARN_ONLY|(O_EXCL*!FLAG(f)),sb.st_mode);
137 if (ofd == -1) return;
138 }
139
140 if (do_deflate(ifd, ofd, FLAG(d), TT.level)) in = out;
141
142 if (out) {
143 struct timespec times[] = {sb.st_atim, sb.st_mtim};
144
145 if (utimensat(AT_FDCWD, out, times, 0)) perror_exit("utimensat");
146 if (chmod(out, sb.st_mode)) perror_exit("chmod");
147 close(ofd);
148 if (!FLAG(k) && in && unlink(in)) perror_msg("unlink %s", in);
149 free(out);
150 }
151 }
152
gzip_main(void)153 void gzip_main(void)
154 {
155 // This depends on 1-9 being at the end of the option list
156 for (TT.level = 0; TT.level<9; TT.level++)
157 if ((toys.optflags>>TT.level)&1) break;
158 if (!(TT.level = 9-TT.level)) TT.level = 6;
159
160 loopfiles(toys.optargs, do_gzip);
161 }
162
gunzip_main(void)163 void gunzip_main(void)
164 {
165 toys.optflags |= FLAG_d;
166 gzip_main();
167 }
168
zcat_main(void)169 void zcat_main(void)
170 {
171 toys.optflags |= (FLAG_c|FLAG_d);
172 gzip_main();
173 }
174