Mercurial > hg > toybox
changeset 54:60a7fb8ddeb4
Add a quick and dirt bzcat (stdin to stdout only for the moment) to test
out the bunzip2 library.
| author | Rob Landley <rob@landley.net> |
|---|---|
| date | Tue, 16 Jan 2007 13:26:02 -0500 |
| parents | 41d55b5d49fd |
| children | 0bb7c679499a |
| files | lib/bunzip.c toys/bzcat.c toys/toylist.h |
| diffstat | 3 files changed, 26 insertions(+), 10 deletions(-) [+] |
line wrap: on
line diff
--- a/lib/bunzip.c Sun Jan 14 20:20:06 2007 -0500 +++ b/lib/bunzip.c Tue Jan 16 13:26:02 2007 -0500 @@ -3,10 +3,11 @@ Copyright 2003, 2006 by Rob Landley (rob@landley.net). - Based on a close reading (but not the actual code) of bzip2 decompression - code by Julian R Seward (jseward@acm.org), which also acknowledges - contributions by Mike Burrows, David Wheeler, Peter Fenwick, Alistair - Moffat, Radford Neal, Ian H. Witten, Robert Sedgewick, and Jon L. Bentley. + Based on a close reading (but not the actual code) of the original bzip2 + decompression code by Julian R Seward (jseward@acm.org), which also + acknowledges contributions by Mike Burrows, David Wheeler, Peter Fenwick, + Alistair Moffat, Radford Neal, Ian H. Witten, Robert Sedgewick, and + Jon L. Bentley. */ #include "toys.h" @@ -117,7 +118,7 @@ } // Decompress a block of text to into intermediate buffer -extern int read_bunzip_data(bunzip_data *bd) +int read_bunzip_data(bunzip_data *bd) { struct group_data *hufGroup; int dbufCount, nextSym, dbufSize, origPtr, groupCount, *base, *limit, @@ -195,7 +196,7 @@ t = get_bits(bd, 5); for (i = 0; i < symCount; i++) { for(;;) { - if (t < 1 || t > MAX_HUFCODE_BITS) return RETVAL_DATA_ERROR; + if (MAX_HUFCODE_BITS < (unsigned)t-1) return RETVAL_DATA_ERROR; if(!get_bits(bd, 1)) break; if(!get_bits(bd, 1)) t++; else t--; @@ -397,7 +398,7 @@ } // Flush output buffer to disk -extern void flush_bunzip_outbuf(bunzip_data *bd, int out_fd) +void flush_bunzip_outbuf(bunzip_data *bd, int out_fd) { if (bd->outbufPos) { if (write(out_fd, bd->outbuf, bd->outbufPos) != bd->outbufPos) @@ -409,7 +410,7 @@ // Undo burrows-wheeler transform on intermediate buffer to produce output. // If !len, write up to len bytes of data to buf. Otherwise write to out_fd. // Returns len ? bytes written : RETVAL_OK. Notice all errors negative #'s. -extern int write_bunzip_data(bunzip_data *bd, int out_fd, char *outbuf, int len) +int write_bunzip_data(bunzip_data *bd, int out_fd, char *outbuf, int len) { unsigned int *dbuf = bd->dbuf; int count, pos, current, run, copies, outbyte, previous, gotcount = 0; @@ -503,7 +504,7 @@ // Allocate the structure, read file header. If !len, src_fd contains // filehandle to read from. Else inbuf contains data. -extern int start_bunzip(bunzip_data **bdp, int src_fd, char *inbuf, int len) +int start_bunzip(bunzip_data **bdp, int src_fd, char *inbuf, int len) { bunzip_data *bd; unsigned int i, j, c; @@ -553,7 +554,7 @@ // Example usage: decompress src_fd to dst_fd. (Stops at end of bzip data, // not end of file.) -extern char *uncompressStream(int src_fd, int dst_fd) +char *bunzipStream(int src_fd, int dst_fd) { bunzip_data *bd; int i;
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/toys/bzcat.c Tue Jan 16 13:26:02 2007 -0500 @@ -0,0 +1,14 @@ +/* vi: set sw=4 ts=4: */ +/* + * bzcat.c - decompress stdin to stdout using bunzip2. + */ + +#include "toys.h" + +int bzcat_main(void) +{ + char *error = bunzipStream(0, 1); + + if (error) error_exit(error); + return 0; +}
--- a/toys/toylist.h Sun Jan 14 20:20:06 2007 -0500 +++ b/toys/toylist.h Tue Jan 16 13:26:02 2007 -0500 @@ -67,6 +67,7 @@ // The rest of these are alphabetical, for binary search. +USE_BZCAT(NEWTOY(bzcat, "", TOYFLAG_USR|TOYFLAG_BIN)) USE_CATV(NEWTOY(catv, "vte", TOYFLAG_NOFORK|TOYFLAG_USR|TOYFLAG_BIN)) USE_TOYSH(NEWTOY(cd, NULL, TOYFLAG_NOFORK)) USE_DF(NEWTOY(df, "Pkt*a", TOYFLAG_USR|TOYFLAG_SBIN))