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