| /* gzip.c - gzip/gunzip/zcat |
| * |
| * Copyright 2017 The Android Open Source Project |
| * |
| * GZIP RFC: http://www.ietf.org/rfc/rfc1952.txt |
| * |
| * todo: qtv --rsyncable |
| |
| // gzip.net version allows all options for all commands. |
| USE_GZIP(NEWTOY(gzip, "cdfk123456789[-123456789]", TOYFLAG_USR|TOYFLAG_BIN)) |
| USE_GUNZIP(NEWTOY(gunzip, "cdfk123456789[-123456789]", TOYFLAG_USR|TOYFLAG_BIN)) |
| USE_ZCAT(NEWTOY(zcat, "cdfk123456789[-123456789]", TOYFLAG_USR|TOYFLAG_BIN)) |
| |
| config GZIP |
| bool "gzip" |
| default y |
| depends on TOYBOX_LIBZ |
| help |
| usage: gzip [-19cdfk] [FILE...] |
| |
| Compress files. With no files, compresses stdin to stdout. |
| On success, the input files are removed and replaced by new |
| files with the .gz suffix. |
| |
| -c Output to stdout |
| -d Decompress (act as gunzip) |
| -f Force: allow overwrite of output file |
| -k Keep input files (default is to remove) |
| -# Compression level 1-9 (1:fastest, 6:default, 9:best) |
| |
| config GUNZIP |
| bool "gunzip" |
| default y |
| depends on TOYBOX_LIBZ |
| help |
| usage: gunzip [-cfk] [FILE...] |
| |
| Decompress files. With no files, decompresses stdin to stdout. |
| On success, the input files are removed and replaced by new |
| files without the .gz suffix. |
| |
| -c Output to stdout (act as zcat) |
| -f Force: allow read from tty |
| -k Keep input files (default is to remove) |
| |
| config ZCAT |
| bool "zcat" |
| default y |
| depends on TOYBOX_LIBZ |
| help |
| usage: zcat [FILE...] |
| |
| Decompress files to stdout. Like `gzip -dc`. |
| |
| -f Force: allow read from tty |
| */ |
| |
| #define FORCE_FLAGS |
| #define FOR_gzip |
| #include "toys.h" |
| |
| #include <zlib.h> |
| |
| GLOBALS( |
| int level; |
| ) |
| |
| static void fix_time(const char *path, struct stat *sb) |
| { |
| struct timespec times[] = { sb->st_atim, sb->st_mtim }; |
| |
| if (utimensat(AT_FDCWD, path, times, 0)) perror_exit("utimensat"); |
| } |
| |
| static int do_zlib(int in_fd, int out_fd) |
| { |
| int len, err = 0, dd = toys.optflags&FLAG_d; |
| char *b = "r"; |
| gzFile gz; |
| |
| if (!dd) { |
| sprintf(b = toybuf, "w%d", TT.level); |
| if (out_fd == 1) out_fd = xdup(out_fd); |
| } |
| if (!(gz = gzdopen(dd ? in_fd : out_fd, b))) perror_exit("gzdopen"); |
| if (dd) { |
| while ((len = gzread(gz, toybuf, sizeof(toybuf))) > 0) |
| if (len != writeall(out_fd, toybuf, len)) break; |
| } else { |
| while ((len = read(in_fd, toybuf, sizeof(toybuf))) > 0) |
| if (len != gzwrite(gz, toybuf, len)) break; |
| } |
| |
| err = !!len; |
| if (len>0 || err == Z_ERRNO) perror_msg(dd ? "write" : "read"); |
| if (len<0) |
| error_msg("%s%s: %s", "gz", dd ? "read" : "write", gzerror(gz, &len)); |
| |
| if (gzclose(gz) != Z_OK) perror_msg("gzclose"), err++; |
| |
| return err; |
| } |
| |
| static void do_gzip(int in_fd, char *arg) |
| { |
| struct stat sb; |
| int len, out_fd = 0; |
| char *out_name = 0; |
| |
| // Are we writing to stdout? |
| if (!in_fd || (toys.optflags&FLAG_c)) out_fd = 1; |
| if (isatty(in_fd)) { |
| if (!(toys.optflags&FLAG_f)) { |
| error_msg("%s:need -f to read TTY"+3*!!in_fd, arg); |
| return; |
| } else out_fd = 1; |
| } |
| |
| // Are we reading file.gz to write to file? |
| if (!out_fd) { |
| if (fstat(in_fd, &sb)) { |
| perror_msg("%s", arg); |
| return; |
| } |
| |
| if (!(toys.optflags&FLAG_d)) out_name = xmprintf("%s%s", arg, ".gz"); |
| else { |
| // "gunzip x.gz" will decompress "x.gz" to "x". |
| if ((len = strlen(arg))<4 || strcmp(arg+len-3, ".gz")) { |
| error_msg("no .gz: %s", arg); |
| return; |
| } |
| out_name = xstrdup(arg); |
| out_name[len-3] = 0; |
| } |
| |
| out_fd = xcreate(out_name, |
| O_CREAT|O_WRONLY|WARN_ONLY|(O_EXCL*!(toys.optflags&FLAG_f)), sb.st_mode); |
| if (out_fd == -1) return; |
| } |
| |
| // if (CFG_TOYBOX_LIBZ) |
| if (do_zlib(in_fd, out_fd) && out_name) arg = out_name; |
| if (out_fd != 1) close(out_fd); |
| |
| if (out_name) { |
| fix_time(out_name, &sb); |
| if (!(toys.optflags&FLAG_k)) if (unlink(arg)) perror_msg("unlink %s", arg); |
| free(out_name); |
| } |
| } |
| |
| void gzip_main(void) |
| { |
| for (TT.level = 0; TT.level<9; TT.level++) |
| if ((toys.optflags>>TT.level)&1) break; |
| if (!(TT.level = 9-TT.level)) TT.level = 6; |
| |
| loopfiles(toys.optargs, do_gzip); |
| } |
| |
| void gunzip_main(void) |
| { |
| toys.optflags |= FLAG_d; |
| gzip_main(); |
| } |
| |
| void zcat_main(void) |
| { |
| toys.optflags |= (FLAG_c|FLAG_d); |
| gzip_main(); |
| } |