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- /* Program to unsqueeze files formed by sq.com
- *
- * Useage:
- *
- * usq [-count] [-fcount] [file1] [file2] ... [filen]
- *
- * where file1 through filen represent one or more files to be compressed,
- * and the following options may be specified:
- *
- * -count Previewing feature: redirects output
- * files to standard output with parity stripped
- * and unprintables except CR, LF, TAB and FF
- * converted to periods. Limits each file
- * to first count lines.
- * Defaults to console, but see below how
- * to capture all in one file for further
- * processing, such as by PIP.
- * Count defaults to a very high value.
- * No CRC check is performed when previewing.
- * Use drive: to cancel this.
- *
- * -fcount Same as -count except formfeed
- * appended to preview of each file.
- * Example: -f10.
- *
- * If no such items are given on the command line you will be
- * prompted for commands (one at a time). An empty command
- * terminates the program.
- *
- * The unsqueezed file name is recorded in the squeezed file.
- *
- */
- /* CHANGE HISTORY:
- * 1.3 Close inbuff to avoid exceeding maximum number of
- * open files. Includes rearranging error exits.
- * 1.4 Add -count option to allow quick inspection of files.
- * 1.5 Break up long lines of introductory text
- * 1.5 -count no longer appends formfeed to preview of each file.
- * -fcount (-f10, -F10) does append formfeed.
- * 1.6 Modified to work correctly under MP/M II (DIO.C change) and
- * signon message shortened.
- * 2.0 Modified to work with CI-C86 compiler (CP/M-86 and MS-DOS)
- * 2.1 Modified for use in MLINK
- * 2.2 Modified for use with optimizing CI-C86 compiler (MS-DOS)
- * 3.0 Generalized for use under UNIX
- */
-
- /* ejecteject */
-
- #define SQMAIN
-
- #include <stdio.h>
- #include "sqcom.h"
- #include "usq.h"
- #define VERSION "3.1 12/19/84"
-
- /* This must follow all include files */
- unsigned int dispcnt; /* How much of each file to preview */
- char ffflag; /* should formfeed separate preview from different files */
-
- main(argc, argv)
- int argc;
- char *argv[];
- {
- int i,c;
- char inparg[16]; /* parameter from input */
-
- dispcnt = 0; /* Not in preview mode */
-
- printf("File unsqueezer version %s (original author: R. Greenlaw)\n\n", VERSION);
-
- /* Process the parameters in order */
- for(i = 1; i < argc; ++i)
- obey(argv[i]);
-
- if(argc < 2) {
- printf("Enter file names, one line at a time, or type <RETURN> to quit.");
- do {
- printf("\n*");
- for(i = 0; i < 16; ++i) {
- if((c = getchar()) == EOF)
- c = '\n'; /* force empty (exit) command */
- if((inparg[i] = c) == '\n') {
- inparg[i] = '\0';
- break;
- }
- }
- if(inparg[0] != '\0')
- obey(inparg);
- } while(inparg[0] != '\0');
- }
- }
-
- /* ejecteject */
-
- obey(p)
- char *p;
- {
- char *q, cc;
-
- if(*p == '-') {
- if(ffflag = ((*(p+1) == 'F') || (*(p+1) == 'f')))
- ++p;
- /* Set number of lines of each file to view */
- dispcnt = 65535; /* default */
- if(*(p+1))
- if((dispcnt = atoi(p + 1)) == 0)
- printf("\nBAD COUNT %s", p + 1);
- return;
- }
-
- /* Check for ambiguous (wild-card) name */
- for(q = p; *q != '\0'; ++q)
- if(*q == '*' || *q == '?') {
- printf("\nCan't accept ambiguous name %s", p);
- return;
- }
-
- unsqueeze(p);
- }
-
- /* ejecteject */
-
- unsqueeze(infile)
- char *infile;
- {
- FILE *inbuff, *outbuff; /* file buffers */
- int i, c;
- char cc;
-
- char *p;
- unsigned int filecrc; /* checksum */
- int numnodes; /* size of decoding tree */
- char outfile[128]; /* output file name */
- unsigned int linect; /* count of number of lines previewed */
- char obuf[128]; /* output buffer */
- int oblen; /* length of output buffer */
- static char errmsg[] = "ERROR - write failure in %s\n";
-
- if(!(inbuff=fopen(infile, "rb"))) {
- printf("Can't open %s\n", infile);
- return;
- }
- /* Initialization */
- linect = 0;
- crc = 0;
- init_cr();
- init_huff();
-
- /* Process header */
- if(getx16(inbuff) != RECOGNIZE) {
- printf("%s is not a squeezed file\n", infile);
- goto closein;
- }
-
- filecrc = getw16(inbuff);
-
- /* Get original file name */
- p = outfile; /* send it to array */
- do {
- *p = getc(inbuff);
- } while(*p++ != '\0');
-
- printf("%s -> %s: ", infile, outfile);
-
-
- numnodes = getw16(inbuff);
-
- if(numnodes < 0 || numnodes >= NUMVALS) {
- printf("%s has invalid decode tree size\n", infile);
- goto closein;
- }
-
- /* Initialize for possible empty tree (SPEOF only) */
- dnode[0].children[0] = -(SPEOF + 1);
- dnode[0].children[1] = -(SPEOF + 1);
-
- /* Get decoding tree from file */
- for(i = 0; i < numnodes; ++i) {
- dnode[i].children[0] = getw16(inbuff);
- dnode[i].children[1] = getw16(inbuff);
- }
-
- if(dispcnt) {
- /* Use standard output for previewing */
- putchar('\n');
- while(((c = getcr(inbuff)) != EOF) && (linect < dispcnt)) {
- cc = 0x7f & c; /* strip parity */
- if((cc < ' ') || (cc > '~'))
- /* Unprintable */
- switch(cc) {
- case '\r': /* return */
- /* newline will generate CR-LF */
- goto next;
- case '\n': /* newline */
- ++linect;
- case '\f': /* formfeed */
- case '\t': /* tab */
- break;
- default:
- cc = '.';
- }
- putchar(cc);
- next: ;
- }
- if(ffflag)
- putchar('\f'); /* formfeed */
- } else {
- /* Create output file */
- if(!(outbuff=fopen(outfile, "wb"))) {
- printf("Can't create %s\n", outfile);
- goto closeall;
- }
- printf("unsqueezing,");
- /* Get translated output bytes and write file */
- oblen = 0;
- while((c = getcr(inbuff)) != EOF) {
- crc += c;
- obuf[oblen++] = c;
- if (oblen >= sizeof(obuf)) {
- if(!fwrite(obuf, sizeof(obuf), 1, outbuff)) {
- printf(errmsg, outfile);
- goto closeall;
- }
- oblen = 0;
- }
- }
- if (oblen && !fwrite(obuf, oblen, 1, outbuff)) {
- printf(errmsg, outfile);
- goto closeall;
- }
-
- if((filecrc && 0xFFFF) != (crc && 0xFFFF))
- printf("ERROR - checksum error in %s\n", outfile);
- else printf(" done.\n");
-
- closeall:
- fclose(outbuff);
- }
-
- closein:
- fclose(inbuff);
- }
-
- getw16(iob) /* get 16-bit word from file */
- FILE *iob;
- {
- int temp;
-
- temp = getc(iob); /* get low order byte */
- temp |= getc(iob) << 8;
- if (temp & 0x8000) temp |= (~0) << 15; /* propogate sign for big ints */
- return temp;
-
- }
-
-
- getx16(iob) /* get 16-bit (unsigned) word from file */
- FILE *iob;
- {
- int temp;
-
- temp = getc(iob); /* get low order byte */
- return temp | (getc(iob) << 8);
-
- }
-
-