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author | Andreas Baumann <mail@andreasbaumann.cc> | 2015-01-03 12:04:58 +0100 |
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committer | Andreas Baumann <mail@andreasbaumann.cc> | 2015-01-03 12:04:58 +0100 |
commit | 008d0be72b2f160382c6e880765e96b64a050c65 (patch) | |
tree | 36f48a98a3815a408e2ce1693dd182af90f80305 /release/src/router/busybox/rpmunpack.c | |
parent | 611becfb8726c60cb060368541ad98191d4532f5 (diff) | |
download | tomato-008d0be72b2f160382c6e880765e96b64a050c65.tar.gz tomato-008d0be72b2f160382c6e880765e96b64a050c65.tar.bz2 |
imported original firmware WRT54GL_v4.30.11_11_US
Diffstat (limited to 'release/src/router/busybox/rpmunpack.c')
-rw-r--r-- | release/src/router/busybox/rpmunpack.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/release/src/router/busybox/rpmunpack.c b/release/src/router/busybox/rpmunpack.c new file mode 100644 index 00000000..12e9c71d --- /dev/null +++ b/release/src/router/busybox/rpmunpack.c @@ -0,0 +1,126 @@ +/* + * rpmunpack for busybox + * + * rpmunpack.c - Utility program to unpack an RPM archive + * + * Gero Kuhlmann <gero@gkminix.han.de> 1998 + * + * This program is public domain software; you can do whatever you like + * with this source, including modifying and redistributing it. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + */ + +#include <fcntl.h> +#include <unistd.h> +#include <string.h> +#include <stdlib.h> +#include "busybox.h" + +/* + * Some general definitions + */ + +#define RPM_MAGIC "\355\253\356\333" +#define GZ_MAGIC_1 '\037' +#define GZ_MAGIC_2 '\213' + +/* + * Global variables + */ +static char *progname; +static int infile, outfile; + +/* + * Read a specified number of bytes from input file + */ +static void myread(int num, char *buffer) +{ + int err; + + if ((err = read(infile, buffer, num)) != num) { + if (err < 0) + perror_msg_and_die(progname); + else + error_msg_and_die("Unexpected end of input file!"); + } +} + +/* + * Main program + */ +int rpmunpack_main(int argc, char **argv) +{ + int len, status = 0; + RESERVE_BB_BUFFER(buffer, BUFSIZ); + + /* Get our own program name */ + if ((progname = strrchr(argv[0], '/')) == NULL) + progname = argv[0]; + else + progname++; + + /* Check for command line parameters */ + if (argc>=2 && *argv[1]=='-') { + show_usage(); + } + + /* Open input file */ + if (argc == 1) + infile = STDIN_FILENO; + else if ((infile = open(argv[1], O_RDONLY)) < 0) + perror_msg_and_die("%s", argv[1]); + + /* Read magic ID and output filename */ + myread(4, buffer); + if (strncmp(buffer, RPM_MAGIC, 4)) { + fprintf(stderr, "Input file is not in RPM format!\n"); + exit(1); + } + myread(6, buffer); /* Skip flags */ + myread(64, buffer); + buffer[64] = '\0'; + + /* Open output file */ + strcat(buffer, ".cpio.gz"); + if (infile == STDIN_FILENO) + outfile = STDOUT_FILENO; + else if ((outfile = open(buffer, O_WRONLY | O_CREAT | O_TRUNC, 0644)) < 0) + perror_msg_and_die("%s", buffer); + + /* + * Now search for the GZIP signature. This is rather awkward, but I don't + * know any other way how to find out the exact starting position of the + * archive within the input file. There are a couple of data structures + * and texts (obviously descriptions, installation shell scripts etc.) + * coming before the archive, but even they start at different offsets + * with different RPM files. However, it looks like the GZIP signature + * never appears before offset 0x200, so we skip these first couple of + * bytes to make the signature scan a little more reliable. + */ + myread(0x200 - 74, buffer); + while (status < 2) { + myread(1, buffer); + if (status == 0 && buffer[0] == GZ_MAGIC_1) + status++; + else if (status == 1 && buffer[0] == GZ_MAGIC_2) + status++; + else + status = 0; + } + buffer[0] = GZ_MAGIC_1; + buffer[1] = GZ_MAGIC_2; + if (write(outfile, buffer, 2) < 0) + perror_msg_and_die("write"); + + /* Now simply copy the GZIP archive into the output file */ + while ((len = read(infile, buffer, BUFSIZ)) > 0) { + if (write(outfile, buffer, len) < 0) + perror_msg_and_die("write"); + } + if (len < 0) + perror_msg_and_die("read"); + return EXIT_SUCCESS; +} |