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- /*
- * gguucode
- *
- * uuencoder/decoder for Amiga 68k and PowerUP (elf binary)
- *
- * To compile (with SAS/C PPC):
- *
- * scppc gguucode
- * ppc-amigaos-ld -r -o gguucode lib:c_ppc.o gguucode.o lib:scppc.a lib:end.o
- * protect gguucode +e
- *
- */
-
- /* Realized by Gabriele Greco
- *
- * Original authors:
- *
- * Written by Mark Horton
- * Modified by ajr (Alan J Rosenthatl,flaps@utcsri.UUCP) to use checksums
- * Modified by fnf (Fred Fish,well!fnf) to use Keith Pyle's suggestion for
- * compatibility
- * Modified by bcn (Bryce Nesbitt,ucbvax!cogsci!bryce) to fix a misleading
- * error message on the Amiga port, to fix a bug that prevented decoding
- * certain files, to work even if trailing spaces have been removed from a
- * file, to check the filesize (if present), to add some error checking, to
- * loop for multiple decodes from a single file, and to handle common
- * BITNET mangling. Kludged around a missing string function in Aztec
- * C. Changed "r" to "rb" and "w" to "wb" for Messy-dos machines
- * (Thanks to Andrew Wylie).
- */
-
- #define __USE_SYSBASE
-
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
-
- #include <ctype.h>
-
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <sys/dir.h>
-
- #include <exec/types.h>
- #include <dos/rdargs.h>
- #include <proto/exec.h>
- #include <proto/dos.h>
-
- UBYTE __aligned version [] = "\0$VER: ggdecode 1.0 (13.3.98)";
-
- void decode(FILE *in, FILE *out, UBYTE *dest);
- LONG filemode(FILE *in);
- void encode(FILE *in, FILE *out);
- LONG outdec(UBYTE *p, FILE *f);
- LONG fr(FILE *fd, UBYTE *buf, LONG cnt);
-
- LONG totalsize = 0; /* Used to count the file size because ftell() does
- not return sane results for pipes */
-
- void start_encode(FILE *in,FILE *out,UBYTE *dest)
- {
- fprintf(out,"\nbegin %o %s\n", filemode(in), FilePart(dest));
-
- encode(in, out);
-
- fprintf(out,"end\n");
- fprintf(out,"size %ld\n",totalsize);
- }
-
- long main(void)
- {
- FILE *in, *out;
- LONG through_loop = 0; /* Dejavu indicator */
- LONG mode; /* file's mode (from header) */
- LONG filesize; /* theoretical file size (from header) */
- UBYTE dest[200],source[200];
- UBYTE buf[80];
- STRPTR Arg[4]={NULL,NULL,NULL,NULL};
- struct RDArgs *Args;
- char action=2;
-
- /* A filename can be specified to be uudecoded, or nothing can
- be specified, and the input will come from STDIN */
-
- if(Args=ReadArgs("FILE,A=ENCODE/S,X=DECODE/S,TO=DEST/K",(LONG *)Arg,NULL))
- {
- /*
- int i;
- for(i=0;i<4;i++)
- {
- printf("Arg %ld -> %ld - %s\n",i,Arg[i],Arg[i]);
- }
- */
- if(Arg[2]&&Arg[1])
- {
- printf("You cant encode and decode at the same time!\n");
- action=0;
- }
- else if(Arg[1])
- {
- action=1;
- }
- else if(Arg[2])
- {
- action=2;
- }
-
- if(!Arg[0])
- {
- if(action==2)
- in=stdin;
- else if(action==1)
- {
- printf("You can't encode from stdin!\n");
- action=0;
- }
- }
- else
- {
- strcpy(source,Arg[0]);
-
- if(!(in=fopen(Arg[0],"r")))
- {
- printf("Unable to open source file!\n");
- action=0;
- }
- }
-
- if(Arg[3])
- {
- DIR *d;
-
- strcpy(dest,Arg[3]);
-
- if(out=fopen(dest,"r"))
- {
- printf("The output file %s already exists!\n",dest);
- fclose(out);
- action=0;
- }
- else if(dest[strlen(dest)-1]!='/'&&dest[strlen(dest)-1]!=':')
- {
- if(d=opendir(dest))
- {
- strcat(dest,"/");
-
- if(action==1)
- {
- printf("Destination must be a file if you are encoding!\n");
- action=0;
- }
-
- closedir(d);
- }
- }
- else
- {
- if(action==1 && (dest[strlen(dest)-1]=='/' || dest[strlen(dest)-1]==':') )
- {
- printf("Destination must be a file if you are encoding!\n");
- action=0;
- }
- }
- }
- else
- {
- dest[0]=0;
-
- if(action==1)
- {
- out=stdout;
- }
- }
-
- FreeArgs(Args);
- }
- else
- {
- printf("Error in the command line!\n");
- action=0;
- }
-
- if(!action)
- {
- exit(0);
- }
- else if (action==1)
- {
- if(dest[0]!=0)
- if ((out = fopen(dest, "w")) == NULL)
- {
- fprintf(stderr, "ERROR: can't open output file %s\n", dest);
- exit(20);
- }
-
- start_encode(in,out,source);
- }
- else for (;;)
- {
- /* search file for header line */
- for (;;)
- {
- if (fgets(buf, sizeof buf, in) == NULL)
- {
- if (!through_loop)
- {
- fprintf(stderr, "ERROR: no `begin' line!\n");
- exit(20);
- }
- else
- {
- exit(0);
- }
- }
- if (strncmp(buf, "begin ", 6) == 0)
- break;
- }
-
- if(!dest[0])
- {
- sscanf(buf, "begin %o %s", &mode, dest);
- }
- else if(dest[strlen(dest)-1]=='/'||dest[strlen(dest)-1]==':')
- {
- sscanf(buf, "begin %o %s", &mode, &dest[strlen(dest)]);
- }
-
- /* create output file */
- if ((out = fopen(dest, "w")) == NULL)
- {
- fprintf(stderr, "ERROR: can't open output file %s\n", dest);
- exit(20);
- }
-
- decode(in, out, dest);
-
- if (fgets(buf, sizeof buf, in) == NULL || strncmp(buf,"end",3))
- { /* don't be overly picky about newline ^ */
- fprintf(stderr, "ERROR: no `end' line\n");
- exit(20);
- }
-
- if (!(fgets(buf,sizeof buf,in) == NULL || strncmp(buf,"size ",3)))
- {
- sscanf(buf, "size %ld", &filesize);
- if (ftell(out) != filesize)
- {
- fprintf(stderr, "ERROR: file should have been %ld bytes long but was %ld.\n", filesize, ftell(out));
- exit(20);
- }
- }
- through_loop = 1;
- } /* forever */
-
- exit(0);
- }
-
- #define SUMSIZE 64
- #define DEC(c) (((c) - ' ') & 077) /* single character decode */
-
- /*
- * Copy from in to out, decoding as you go.
- * If a return or newline is encountered too early in a line, it is
- * assumed that means that some editor has truncated trailing spaces.
- */
- void decode(FILE *in, FILE *out, UBYTE *dest)
- {
- extern errno;
-
- UBYTE *bp;
- LONG nosum=0;
- LONG j, n, checksum, line;
- UBYTE buf[256];
-
- for (line = 1; ; line++) /* for each input line */
- {
- if (fgets(buf, sizeof buf, in) == NULL)
- {
- fprintf(stderr, "ERROR: input ended unexpectedly!\n");
- exit(20);
- }
-
- /* Pad end of lines in case some editor truncated trailing
- spaces */
-
- for (n=0;n<79;n++) /* search for first \r, \n or \000 */
- {
- if (buf[n]=='\176') /* If BITNET made a twiddle, */
- buf[n]='\136'; /* we make a caret */
- if (buf[n]=='\r'||buf[n]=='\n'||buf[n]=='\000')
- break;
- }
- for (;n<79;n++) /* when found, fill rest of line with space */
- {
- buf[n]=' ';
- }
- buf[79]=0; /* terminate new string */
-
- checksum = 0;
- n = DEC(buf[0]);
- if (n <= 0)
- break; /* 0 bytes on a line?? Must be the last line */
-
- bp = &buf[1];
-
- /* FOUR input characters go into each THREE output charcters */
-
- while (n >= 4)
- {
- j = DEC(bp[0]) << 2 | DEC(bp[1]) >> 4; putc(j, out); checksum += j;
- j = DEC(bp[1]) << 4 | DEC(bp[2]) >> 2; putc(j, out); checksum += j;
- j = DEC(bp[2]) << 6 | DEC(bp[3]); putc(j, out); checksum += j;
- checksum = checksum % SUMSIZE;
- bp += 4;
- n -= 3;
- }
-
- j = DEC(bp[0]) << 2 | DEC(bp[1]) >> 4;
- checksum += j;
- if (n >= 1)
- putc(j, out);
- j = DEC(bp[1]) << 4 | DEC(bp[2]) >> 2;
- checksum += j;
- if (n >= 2)
- putc(j, out);
- j = DEC(bp[2]) << 6 | DEC(bp[3]);
- checksum += j;
- if (n >= 3)
- putc(j, out);
- checksum = checksum % SUMSIZE;
- bp += 4;
- n -= 3;
-
- /* Error checking under UNIX??? You must be kidding... */
- /* Check if an error occured while writing to that last line */
- if (errno)
- {
- fprintf(stderr, "ERROR: error writing to %s\n",dest);
- exit(20);
- }
-
- /* The line has been decoded; now check that sum */
-
- nosum |= !isspace(*bp);
- if (nosum) /* Is there a checksum at all?? */
- {
- if (checksum != DEC(*bp)) /* Does that checksum match? */
- {
- fprintf(stderr, "ERROR: checksum mismatch decoding %s, line %d.\n",dest, line);
- }
- } /* sum */
- } /* line */
- } /* function */
-
- LONG filemode(FILE *in)
- {
- #ifdef unix_stat
- struct stat sbuf;
-
- fstat(fileno(in), &sbuf);
- return( sbuf.st_mode & 0777); /* figure out the input file mode */
-
- #else
- return( 0644 ); /* Default permissions */
- #endif
- }
-
- #define SUMSIZE 64 /* 6 bits */
- /* ENC is the basic 1 character encode function to make a char printing */
- /* Each output character represents 6 bits of input */
- #define ENC(c) ((c) ? ((c) & 077) + ' ': '`')
-
- /*
- * copy from in to out, encoding as you go along.
- */
- void encode(FILE *in, FILE *out)
- {
- extern errno;
-
- LONG i, n, checksum;
- char buf[256];
-
- for (;;) {
- /* 1 (up to) 45 character line */
- n = fr(in, buf, 45);
- putc(ENC(n), out);
-
- checksum = 0;
- for (i=0; i<n; i += 3)
- checksum = (checksum+outdec(&buf[i], out)) % SUMSIZE;
-
- putc(ENC(checksum), out);
- putc('\n', out);
-
- /* Error checking under UNIX?? You must be kidding! */
- /*
- if (errno) {
- fprintf(stderr, "ERROR: error writing to output\n");
- exit(20);
- }
- */
- if (n <= 0)
- break;
- }
- }
-
- /*
- * output one group of 3 bytes, pointed at by p, on file f.
- * return the checksum increment.
- */
- LONG outdec(UBYTE *p, FILE *f)
- {
- LONG c1, c2, c3, c4;
-
- c1 = *p >> 2;
- c2 = (*p << 4) & 060 | (p[1] >> 4) & 017;
- c3 = (p[1] << 2) & 074 | (p[2] >> 6) & 03;
- c4 = p[2] & 077;
- putc(ENC(c1), f);
- putc(ENC(c2), f);
- putc(ENC(c3), f);
- putc(ENC(c4), f);
-
- return((p[0]+p[1]+p[2]) % SUMSIZE);
- }
-
- /* fr: like read but stdio */
- LONG fr(FILE *fd, UBYTE *buf, LONG cnt)
- {
- LONG c, i;
-
- for (i=0; i<cnt; i++) {
- c = getc(fd);
- if (c == EOF)
- return(i);
- totalsize++;
- buf[i] = c;
- }
- return (cnt);
- }
-