From 106d81abd8dacfc7fdbc2c94cbaafb0d18950649 Mon Sep 17 00:00:00 2001 From: Rob Landley Date: Sun, 21 Apr 2019 19:47:16 -0500 Subject: Promote gzip/zcat but keep gunzip default n until lib/deflate.c finished. --- toys/lsb/gzip.c | 172 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 172 insertions(+) create mode 100644 toys/lsb/gzip.c (limited to 'toys/lsb') diff --git a/toys/lsb/gzip.c b/toys/lsb/gzip.c new file mode 100644 index 00000000..7bd8d381 --- /dev/null +++ b/toys/lsb/gzip.c @@ -0,0 +1,172 @@ +/* gzip.c - gzip/gunzip/zcat + * + * Copyright 2017 The Android Open Source Project + * + * See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/gzip.html + * 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 + 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 n + 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 + 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" + +GLOBALS( + int level; +) + +// Use assembly optimized zlib code? +#if CFG_TOYBOX_LIBZ +#include + +// Read from in_fd, write to out_fd, decompress if dd else compress +static int do_deflate(int in_fd, int out_fd, int dd, int level) +{ + int len, err = 0; + char *b = "r"; + gzFile gz; + + if (!dd) { + sprintf(b = toybuf, "w%d", 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; +} + +// Use toybox's builtin lib/deflate.c +#else + +// Read from in_fd, write to out_fd, decompress if dd else compress +static int do_deflate(int in_fd, int out_fd, int dd, int level) +{ + int x; + + if (dd) WOULD_EXIT(x, gunzip_fd(in_fd, out_fd)); + else WOULD_EXIT(x, gzip_fd(in_fd, out_fd)); + + return x; +} + +#endif + +static void do_gzip(int ifd, char *in) +{ + struct stat sb; + char *out = 0; + int ofd = 0; + + // Are we writing to stdout? + if (!ifd || FLAG(c)) ofd = 1; + if (isatty(ifd)) { + if (!FLAG(f)) return error_msg("%s:need -f to read TTY"+3*!!ifd, in); + else ofd = 1; + } + + // Are we reading file.gz to write to file? + if (!ofd) { + if (fstat(ifd, &sb)) return perror_msg("%s", in); + + // Add or remove .gz suffix as necessary + if (!FLAG(d)) out = xmprintf("%s%s", in, ".gz"); + else if ((out = strend(out, ".gz"))>in) out = xstrndup(out, out-in); + else return error_msg("no .gz: %s", in); + + ofd = xcreate(out, O_CREAT|O_WRONLY|WARN_ONLY|(O_EXCL*!FLAG(f)),sb.st_mode); + if (ofd == -1) return; + } + + if (do_deflate(ifd, ofd, FLAG(d), TT.level)) in = out; + + if (out) { + struct timespec times[] = {sb.st_atim, sb.st_mtim}; + + if (futimens(ofd, times)) perror_exit("utimensat"); + close(ofd); + if (!FLAG(k) && in && unlink(in)) perror_msg("unlink %s", in); + free(out); + } +} + +void gzip_main(void) +{ + // This depends on 1-9 being at the end of the option list + 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(); +} -- cgit v1.2.3