Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>
#include <bio.h>
#include "bzlib.h"

static  int     bzipf(char*, int);
static  int     bzip(char*, long, int, Biobuf*);

static  Biobuf  bout;
static  int     level;
static  int     debug;
static  int     verbose;


static void
usage(void)
{
        fprint(2, "usage: bzip2 [-vcD] [-1-9] [file ...]\n");
        exits("usage");
}

void
main(int argc, char **argv)
{
        int i, ok, stdout;

        level = 6;
        stdout = 0;
        ARGBEGIN{
        case 'D':
                debug++;
                break;
        case 'v':
                verbose++;
                break;
        case 'c':
                stdout++;
                break;
        case '1': case '2': case '3': case '4':
        case '5': case '6': case '7': case '8': case '9':
                level = ARGC() - '0';
                break;
        default:
                usage();
                break;
        }ARGEND

        if(argc == 0){
                Binit(&bout, 1, OWRITE);
                ok = bzip(nil, time(0), 0, &bout);
                Bterm(&bout);
        }else{
                ok = 1;
                for(i = 0; i < argc; i++)
                        ok &= bzipf(argv[i], stdout);
        }
        exits(ok ? nil: "errors");
}

static int
bzipf(char *file, int stdout)
{
        Dir *dir;
        char ofile[128], *f, *s;
        int ifd, ofd, ok;

        ifd = open(file, OREAD);
        if(ifd < 0){
                fprint(2, "bzip2: can't open %s: %r\n", file);
                return 0;
        }
        dir = dirfstat(ifd);
        if(dir == nil){
                fprint(2, "bzip2: can't stat %s: %r\n", file);
                close(ifd);
                return 0;
        }
        if(dir->mode & DMDIR){
                fprint(2, "bzip2: can't compress a directory\n");
                close(ifd);
                free(dir);
                return 0;
        }

        if(stdout){
                ofd = 1;
                strcpy(ofile, "<stdout>");
        }else{
                f = strrchr(file, '/');
                if(f != nil)
                        f++;
                else
                        f = file;
                s = strrchr(f, '.');
                if(s != nil && s != ofile && strcmp(s, ".tar") == 0){
                        *s = '\0';
                        snprint(ofile, sizeof(ofile), "%s.tbz", f);
                }else
                        snprint(ofile, sizeof(ofile), "%s.bz2", f);
                ofd = create(ofile, OWRITE, 0666);
                if(ofd < 0){
                        fprint(2, "bzip2: can't open %s: %r\n", ofile);
                        free(dir);
                        close(ifd);
                        return 0;
                }
        }

        if(verbose)
                fprint(2, "compressing %s to %s\n", file, ofile);

        Binit(&bout, ofd, OWRITE);
        ok = bzip(file, dir->mtime, ifd, &bout);
        if(!ok || Bflush(&bout) < 0){
                fprint(2, "bzip2: error writing %s: %r\n", ofile);
                if(!stdout)
                        remove(ofile);
        }
        Bterm(&bout);
        free(dir);
        close(ifd);
        close(ofd);
        return ok;
}

static int
bzip(char *file, long mtime, int ifd, Biobuf *bout)
{
        int e, n, done, onemore;
        char buf[8192];
        char obuf[8192];
        Biobuf bin;
        bz_stream strm;

        USED(file);
        USED(mtime);

        memset(&strm, 0, sizeof strm);
        BZ2_bzCompressInit(&strm, level, verbose, 0);

        strm.next_in = buf;
        strm.avail_in = 0;
        strm.next_out = obuf;
        strm.avail_out = sizeof obuf;

        done = 0;
        Binit(&bin, ifd, OREAD);

        /*
         * onemore is a crummy hack to go 'round the loop
         * once after we finish, to flush the output buffer.
         */
        onemore = 1;
        SET(e);
        do {
                if(!done && strm.avail_in < sizeof buf) {
                        if(strm.avail_in)
                                memmove(buf, strm.next_in, strm.avail_in);
                        
                        n = Bread(&bin, buf+strm.avail_in, sizeof(buf)-strm.avail_in);
                        if(n <= 0)
                                done = 1;
                        else
                                strm.avail_in += n;
                        strm.next_in = buf;
                }
                if(strm.avail_out < sizeof obuf) {
                        Bwrite(bout, obuf, sizeof(obuf)-strm.avail_out);
                        strm.next_out = obuf;
                        strm.avail_out = sizeof obuf;
                }

                if(onemore == 0)
                        break;
        } while((e=BZ2_bzCompress(&strm, done ? BZ_FINISH : BZ_RUN)) == BZ_RUN_OK || e == BZ_FINISH_OK || onemore--);

        if(e != BZ_STREAM_END) {
                fprint(2, "bzip2: compress failed\n");
                return 0;
        }

        if(BZ2_bzCompressEnd(&strm) != BZ_OK) {
                fprint(2, "bzip2: compress end failed (can't happen)\n");
                return 0;
        }

        Bterm(&bin);

        return 1;
}