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-rw-r--r--toys/other/bzcat.c93
1 files changed, 82 insertions, 11 deletions
diff --git a/toys/other/bzcat.c b/toys/other/bzcat.c
index 642590d1..850c51ce 100644
--- a/toys/other/bzcat.c
+++ b/toys/other/bzcat.c
@@ -1,4 +1,4 @@
-/* bzcat.c - decompress stdin to stdout using bunzip2.
+/* bzcat.c - bzip2 decompression
*
* Copyright 2003, 2007 Rob Landley <rob@landley.net>
*
@@ -12,16 +12,33 @@
USE_BZCAT(NEWTOY(bzcat, NULL, TOYFLAG_USR|TOYFLAG_BIN))
+USE_BUNZIP2(NEWTOY(bunzip2, "cftkv", TOYFLAG_USR|TOYFLAG_BIN))
+
+config BUNZIP2
+ bool "bunzip2"
+ default y
+ help
+ usage: bunzip2 [-cftkv] [FILE...]
+
+ Decompress listed files (file.bz becomes file) deleting archive file(s).
+ Read from stdin if no files listed.
+
+ -c force output to stdout
+ -f force decompression. (If FILE doesn't end in .bz, replace original.)
+ -k keep input files (-c and -t imply this)
+ -t test integrity
+ -v verbose
config BZCAT
bool "bzcat"
default y
help
- usage: bzcat [filename...]
+ usage: bzcat [FILE...]
Decompress listed files to stdout. Use stdin if no files listed.
*/
+#define FOR_bunzip2
#include "toys.h"
#define THREADS 1
@@ -421,7 +438,7 @@ static int read_huffman_data(struct bunzip_data *bd, struct bwdata *bw)
}
// Flush output buffer to disk
-void flush_bunzip_outbuf(struct bunzip_data *bd, int out_fd)
+static void flush_bunzip_outbuf(struct bunzip_data *bd, int out_fd)
{
if (bd->outbufPos) {
if (write(out_fd, bd->outbuf, bd->outbufPos) != bd->outbufPos)
@@ -430,7 +447,7 @@ void flush_bunzip_outbuf(struct bunzip_data *bd, int out_fd)
}
}
-void burrows_wheeler_prep(struct bunzip_data *bd, struct bwdata *bw)
+static void burrows_wheeler_prep(struct bunzip_data *bd, struct bwdata *bw)
{
int ii, jj;
unsigned int *dbuf = bw->dbuf;
@@ -474,7 +491,7 @@ void burrows_wheeler_prep(struct bunzip_data *bd, struct bwdata *bw)
}
// Decompress a block of text to intermediate buffer
-int read_bunzip_data(struct bunzip_data *bd)
+static int read_bunzip_data(struct bunzip_data *bd)
{
int rc = read_block_header(bd, bd->bwdata);
if (!rc) rc=read_huffman_data(bd, bd->bwdata);
@@ -493,7 +510,8 @@ int read_bunzip_data(struct bunzip_data *bd)
// http://dogma.net/markn/articles/bwt/bwt.htm
// http://marknelson.us/1996/09/01/bwt/
-int write_bunzip_data(struct bunzip_data *bd, struct bwdata *bw, int out_fd, char *outbuf, int len)
+static int write_bunzip_data(struct bunzip_data *bd, struct bwdata *bw,
+ int out_fd, char *outbuf, int len)
{
unsigned int *dbuf = bw->dbuf;
int count, pos, current, run, copies, outbyte, previous, gotcount = 0;
@@ -584,7 +602,8 @@ dataus_interruptus:
// Allocate the structure, read file header. If !len, src_fd contains
// filehandle to read from. Else inbuf contains data.
-int start_bunzip(struct bunzip_data **bdp, int src_fd, char *inbuf, int len)
+static int start_bunzip(struct bunzip_data **bdp, int src_fd, char *inbuf,
+ int len)
{
struct bunzip_data *bd;
unsigned int i;
@@ -622,10 +641,10 @@ int start_bunzip(struct bunzip_data **bdp, int src_fd, char *inbuf, int len)
// Example usage: decompress src_fd to dst_fd. (Stops at end of bzip data,
// not end of file.)
-void bunzipStream(int src_fd, int dst_fd)
+static char *bunzipStream(int src_fd, int dst_fd)
{
struct bunzip_data *bd;
- char *bunzip_errors[]={NULL, "not bzip", "bad data", "old format"};
+ char *bunzip_errors[] = {0, "not bzip", "bad data", "old format"};
int i, j;
if (!(i = start_bunzip(&bd,src_fd, 0, 0))) {
@@ -636,15 +655,67 @@ void bunzipStream(int src_fd, int dst_fd)
for (j=0; j<THREADS; j++) free(bd->bwdata[j].dbuf);
free(bd);
- if (i) error_exit(bunzip_errors[-i]);
+
+ return bunzip_errors[-i];
}
static void do_bzcat(int fd, char *name)
{
- bunzipStream(fd, 1);
+ char *err = bunzipStream(fd, 1);
+
+ if (err) error_exit(err);
}
void bzcat_main(void)
{
loopfiles(toys.optargs, do_bzcat);
}
+
+static void do_bunzip2(int fd, char *name)
+{
+ int outfd = 1, rename = 0, len = strlen(name);
+ char *tmp, *err, *dotbz = 0;
+
+ // Trim off .bz or .bz2 extension
+ dotbz = name+len-3;
+ if ((len>3 && !strcmp(dotbz, ".bz")) || (len>4 && !strcmp(--dotbz, ".bz2")))
+ dotbz = 0;
+
+ // For - no replace
+ if (toys.optflags&FLAG_t) outfd = xopen("/dev/null", O_WRONLY);
+ else if ((fd || strcmp(name, "-")) && !(toys.optflags&FLAG_c)) {
+ if (toys.optflags&FLAG_k) {
+ if (!dotbz || !access(name, X_OK)) {
+ error_msg("%s exists", name);
+
+ return;
+ }
+ }
+ outfd = copy_tempfile(fd, name, &tmp);
+ rename++;
+ }
+
+ if (toys.optflags&FLAG_v) printf("%s:", name);
+ err = bunzipStream(fd, outfd);
+ if (toys.optflags&FLAG_v) {
+ printf("%s\n", err ? err : "ok");
+ toys.exitval |= !!err;
+ } else if (err) error_msg(err);
+
+ // can't test outfd==1 because may have been called with stdin+stdout closed
+ if (rename) {
+ if (toys.optflags&FLAG_k) {
+ free(tmp);
+ tmp = 0;
+ } else {
+ if (dotbz) *dotbz = '.';
+ if (!unlink(name)) perror_msg("%s", name);
+ }
+ (err ? delete_tempfile : replace_tempfile)(-1, outfd, &tmp);
+ }
+}
+
+void bunzip2_main(void)
+{
+ loopfiles(toys.optargs, do_bunzip2);
+}