home *** CD-ROM | disk | FTP | other *** search
- #ifndef LINT
- static char sccsid[]="@(#) portable.c 1.5 87/05/03 16:01:05";
- #endif /* LINT */
-
- #include "options.h"
- /*
- Copyright (C) 1986, 1987 Rahul Dhesi -- All rights reserved
- */
- /**********************
- portable.c contains functions needed to make Zoo portable to various
- implementations of C.
-
- Note: Provided a 2's complement machine is used, all functions in
- this file are themselves machine-independent and need not be changed
- when implementing Zoo on a different machine. Some code will choke
- on 1's complement machines--I think.
-
- For machine-dependent declarations see files "machine.h" and "options.h".
-
- For machine-dependent functions see file "machine.c"
- */
-
- /* See if we could just use these for MSC */
- #ifdef MSC
- #ifndef PORTABLE
- #define PORTABLE
- #endif
- #endif
-
-
- #ifdef PORTABLE
- #include <stdio.h>
- #include "various.h"
- #include "zoofns.h"
-
- #include "machine.h"
- #include "zoo.h"
- #include "debug.h"
- #include "assert.h"
-
- #ifdef NEEDCTYP
- #include <ctype.h> /* for tolower() */
- #endif
-
- #ifdef DEBUG
- extern int verbose;
- #endif
-
- /* Functions defined for use within this file only. */
- #ifdef LINT_ARGS
- long to_long (BYTE[]);
- int to_int (BYTE[]);
- void b_to_zooh(struct zoo_header *, BYTE[]);
- void b_to_dir(struct direntry *, BYTE[]);
- int dir_to_b(BYTE[], struct direntry *);
- void zooh_to_b(BYTE[], struct zoo_header *);
- void splitlong(BYTE[], long);
- void splitint(BYTE[], int);
- #else
- long to_long ();
- int to_int ();
- void b_to_zooh();
- void b_to_dir();
- int dir_to_b();
- void zooh_to_b();
- void splitlong();
- void splitint();
- #endif
-
- extern unsigned int crccode;
-
-
- /************************************************************************/
- /*** Following are functions that make up for various implementations ***/
- /*** of C not having certain library routines. ***/
- /************************************************************************/
-
- #ifndef STRLWR
- /**********************
- strlwr() converts a string to lowercase and returns a pointer to the string
- */
- char *strlwr (str)
- char *str;
- {
- register char *s;
- s = str;
- while (*s != '\0') {
- *s = toascii(*s);
- if (isupper(*s))
- *s = tolower(*s);
- s++;
- }
- return (str);
- }
- #endif /* STRLWR */
-
- /**********************
- strcmpi() compares strings just like strcmp() but it does it without regard to
- case.
- */
- int strcmpi (s1, s2)
- register char *s1, *s2;
- {
- for ( ; tolower(*s1) == tolower(*s2); s1++, s2++)
- if (*s1 == '\0')
- return(0);
- return(tolower(*s1) - tolower(*s2));
- }
-
- #ifndef MEMSET
- /**********************
- memset() exists in Microsoft C and UNIX System V but not in Xenix. It sets
- the first "cnt" bytes of "dest" to the character "c" and returns a pointer to
- "dest".
- */
- char *memset (dest, c, cnt)
- char *dest;
- int c;
- unsigned cnt;
- {
- register unsigned i;
- for (i = 0; i < cnt; i++) {
- *(dest + i) = c;
- }
- }
- #endif /* MEMSET */
-
- #ifndef FPUTCHAR
- /**********************
- fputchar() writes a character to stdout. It is identical to putchar
- but is a function, not a macro.
- */
- int fputchar (c)
- int c;
- {
- return (fputc(c, stdout));
- }
- #endif /* FPUTCHAR */
-
- #ifndef TELL
- /**********************
- tell() returns the current position of the file handle supplied
- */
- long tell (handle)
- int handle;
- {
- return (lseek (handle, 0L, 1)); /* seek to current position */
- }
- #endif /* TELL */
-
- /***********************************************************************/
- /*** Following are declarations and functions that are written in a ***/
- /*** machine-independent way but they implement machine-dependent ***/
- /*** activities ***/
- /***********************************************************************/
-
- #ifndef MSC
- /**********************
- to_long() converts four consecutive bytes, in order of increasing
- significance, to a long integer. It is used to make Zoo independent of the
- byte order of the system.
- */
- long to_long(data)
- BYTE data[];
- {
- return (long) ((unsigned long) data[0] | ((unsigned long) data[1] << 8) |
- ((unsigned long) data[2] << 16) | ((unsigned long) data[3] << 24));
- }
-
- /********************
- splitlong() converts a long integer to four consecutive BYTEs in order
- of increasing significance.
- */
- void splitlong(bytes, bigword)
- BYTE bytes[];
- long bigword;
- {
- int i;
- for (i = 0; i < 4; i++) {
- bytes[i] = bigword & 0xff;
- bigword = (unsigned long) bigword >> 8;
- }
- }
-
- /*******************
- splitint() converts an integer to two consecutive BYTEs in order
- of increasing significance.
- */
- void splitint(bytes, word)
- BYTE bytes[];
- int word;
- {
- bytes[0] = word & 0xff;
- word = (unsigned int) word >> 8;
- bytes[1] = word & 0xff;
- }
-
- /**********************
- to_int() converts two consecutive bytes, in order of increasing
- significance, to an integer, in a machine-independent manner
- */
- int to_int(data)
- BYTE data[];
- {
- return (int) ((unsigned int) data[0] | ((unsigned int) data[1] << 8));
- }
-
- #else /* else of ifndef MSC */
-
- long to_long(data)
- BYTE data[];
- {
- return ( * (long *) data );
- }
-
- /********************
- splitlong() converts a long integer to four consecutive BYTEs in order
- of increasing significance.
- */
- void splitlong(bytes, bigword)
- BYTE bytes[];
- long bigword;
- {
- * (long *) bytes = bigword;
- }
-
- /*******************
- splitint() converts an integer to two consecutive BYTEs in order
- of increasing significance.
- */
- void splitint(bytes, word)
- BYTE bytes[];
- int word;
- {
- * (int *) bytes = word;
- }
-
- /**********************
- to_int() converts two consecutive bytes, in order of increasing
- significance, to an integer.
- */
- int to_int(data)
- BYTE data[];
- {
- return (*(int *) data);
- }
-
- #endif /* ifndef MSC .. else ... */
-
-
- #ifndef FIZ
- /**********************
- Function frd_zooh() reads the header of a Zoo archive in a machine-
- independent manner, from a FILE.
- */
- int frd_zooh(zoo_header, zoo_file)
- struct zoo_header *zoo_header;
- FILE *zoo_file;
- {
- int status;
- BYTE bytes[SIZ_ZOOH]; /* canonical header representation */
- #ifdef DEBUG
- if (verbose) {
- printf("At file position [%8lx] ", ftell(zoo_file));
- }
- #endif
- status = fread ((char *) bytes, 1, SIZ_ZOOH, zoo_file);
- b_to_zooh (zoo_header, bytes); /* convert array to structure */
- #ifdef DEBUG
- if (verbose) {
- printf("frd_zooh: reading\n");
- show_h(zoo_header);
- }
- #endif
- if (status < SIZ_ZOOH)
- return (-1);
- else
- return (0);
- }
- #endif /* ifndef FIZ */
-
-
- /**********************
- Function frd_dir() reads a directory entry in a machine-independent manner,
- from a FILE.
- */
- int frd_dir(direntry, zoo_file)
- struct direntry *direntry;
- FILE *zoo_file;
- {
- int status;
- BYTE bytes[MAXDIRSIZE]; /* big enough to hold variable part too */
-
- /* To simplify things, we read the maximum possible size of the
- directory entry including the variable size and discard what is not
- needed */
- #ifdef DEBUG
- if (verbose) {
- printf("At file position [%8lx] ", ftell(zoo_file));
- }
- #endif
- status = fread ((char *) bytes, 1, MAXDIRSIZE, zoo_file);
- if (status < SIZ_DIR)
- return (-1);
- b_to_dir (direntry, bytes);
- #ifdef DEBUG
- if (verbose) {
- printf("frd_dir: reading\n");
- show_dir(direntry);
- }
- #endif
- return (0);
- }
-
- #ifndef FIZ
- /**********************
- Function rd_zooh() reads a Zoo archive header in a machine-dependent manner,
- from a file handle.
- */
- int rd_zooh (header, zoo_han)
- struct zoo_header *header;
- int zoo_han;
- {
- int status;
- BYTE bytes[SIZ_ZOOH];
- #ifdef DEBUG
- if (verbose) {
- printf("At file position [%8lx] ", tell(zoo_han));
- }
- #endif
- status = read (zoo_han, (char *) bytes, SIZ_ZOOH);
- b_to_zooh (header, bytes);
- #ifdef DEBUG
- if (verbose) {
- printf("rd_zooh: reading\n");
- show_h(header);
- }
- #endif
- return (status);
- }
-
- /**********************
- Function rd_dir() reads a directory entry in a machine-independent manner
- from a handle.
- */
- int rd_dir(direntry, zoo_han)
- struct direntry *direntry;
- int zoo_han;
- {
- int status;
- BYTE bytes[MAXDIRSIZE]; /* big enough to hold variable part too */
- /* To simplify things, we read the maximum possible size of the
- directory entry including the variable size and discard what is not
- needed */
- #ifdef DEBUG
- if (verbose) {
- printf("At file position [%8lx] ", tell(zoo_han));
- }
- #endif
- status = read (zoo_han, (char *) bytes, MAXDIRSIZE);
- if (status < SIZ_DIR)
- return (-1);
- b_to_dir (direntry, bytes);
- #ifdef DEBUG
- if (verbose) {
- printf("rd_dir: reading\n");
- show_dir(direntry);
- }
- #endif
- return (0);
- }
-
- /***********************
- Function fwr_dir() writes a directory entry in a machine-independent manner
- to a FILE. Return value is -1 on error, else 0.
- */
- int fwr_dir(direntry, zoo_file)
- struct direntry *direntry;
- FILE *zoo_file;
- {
- int size;
- BYTE bytes[MAXDIRSIZE];
- assert (direntry->type <= 2);
- size = dir_to_b (bytes, direntry);
- #ifdef DEBUG
- if (verbose) {
- printf("At file position [%8lx] ", ftell(zoo_file));
- printf("fwr_dir: writing\n");
- show_dir(direntry);
- }
- #endif
-
- if (fwrite ((char *) bytes, 1, size, zoo_file) != size)
- return (-1);
- else
- return (0);
- }
-
- /***********************
- Function wr_dir() writes a directory entry in a machine-independent manner
- to a handle. Return value is -1 on error else 0.
- */
- int wr_dir(direntry, zoo_han)
- struct direntry *direntry;
- int zoo_han;
- {
- int size;
- BYTE bytes[MAXDIRSIZE];
- assert (direntry->type <= 2);
- size = dir_to_b (bytes, direntry);
- #ifdef DEBUG
- if (verbose) {
- printf("At file position [%8lx] ", tell(zoo_han));
- printf("wr_dir: writing\n");
- show_dir(direntry);
- }
- #endif
- if (write (zoo_han, (char *) bytes, size) != size)
- return (-1);
- else
- return (0);
- }
-
- /***********************
- Function wr_zooh() writes an archive header in a machine-independent manner
- to a handle. Return value -1 if error else 0.
- */
- int wr_zooh(zoo_header, zoo_han)
- struct zoo_header *zoo_header;
- int zoo_han;
- {
- BYTE bytes[SIZ_DIR];
- zooh_to_b (bytes, zoo_header);
- if (write (zoo_han, (char *) bytes, SIZ_ZOOH) != SIZ_ZOOH)
- return (-1);
- else
- return (0);
- }
-
- /***********************
- Function fwr_zooh() writes an archive header in a machine-independent manner
- to a FILE. Return value is -1 if error else 0.
- */
- int fwr_zooh(zoo_header, zoo_file)
- struct zoo_header *zoo_header;
- FILE *zoo_file;
- {
- BYTE bytes[SIZ_DIR];
- zooh_to_b (bytes, zoo_header);
- if (fwrite ((char *) bytes, 1, SIZ_ZOOH, zoo_file) != SIZ_ZOOH)
- return (-1);
- else
- return (0);
- }
-
- /***********************
- b_to_zooh() converts an array of BYTE to a zoo_header structure.
- */
- void b_to_zooh (zoo_header, bytes)
- struct zoo_header *zoo_header;
- BYTE bytes[];
- {
- int i;
- for (i = 0; i < SIZ_TEXT; i++) /* copy text */
- zoo_header->text[i] = bytes[TEXT_I + i];
- zoo_header->zoo_tag = to_long(&bytes[ZTAG_I]); /* copy zoo_tag */
- zoo_header->zoo_start = to_long(&bytes[ZST_I]); /* copy zoo_start */
- zoo_header->zoo_minus = to_long(&bytes[ZSTM_I]);
- zoo_header->major_ver = bytes[MAJV_I]; /* copy versions */
- zoo_header->minor_ver = bytes[MINV_I];
- }
-
- /***********************
- zooh_to_b() converts a zoo_header structure to an array of BYTE.
- */
- void zooh_to_b (bytes, zoo_header)
- struct zoo_header *zoo_header;
- BYTE bytes[];
- {
- int i;
- for (i = 0; i < SIZ_TEXT; i++) /* copy text */
- bytes[TEXT_I + i] = zoo_header->text[i];
- splitlong (&bytes[ZTAG_I], zoo_header->zoo_tag);
- splitlong (&bytes[ZST_I], zoo_header->zoo_start);
- splitlong (&bytes[ZSTM_I], zoo_header->zoo_minus);
- bytes[MAJV_I] = zoo_header->major_ver; /* copy versions */
- bytes[MINV_I] = zoo_header->minor_ver;
- } /* zooh_to_b() */
-
- /************************
- dir_to_b() converts a directory entry structure to an array of BYTE.
- */
- int dir_to_b (bytes, direntry)
- struct direntry *direntry;
- BYTE bytes[];
- {
- int i;
- int cursize;
- int fixsize;
- splitlong(&bytes[DTAG_I], direntry->zoo_tag);
- bytes[DTYP_I] = direntry->type ;
- bytes[PKM_I] = direntry->packing_method ;
- splitlong(&bytes[NXT_I], direntry->next);
- splitlong(&bytes[OFS_I], direntry->offset);
- splitint(&bytes[DAT_I], direntry->date);
- splitint(&bytes[TIM_I], direntry->time);
- splitint(&bytes[CRC_I], direntry->file_crc);
- splitlong(&bytes[ORGS_I], direntry->org_size);
- splitlong(&bytes[SIZNOW_I], direntry->size_now);
- bytes[DMAJ_I] = direntry->major_ver;
- bytes[DMIN_I] = direntry->minor_ver;
- bytes[DEL_I] = direntry->deleted;
- bytes[STRUC_I] = direntry->struc;
- splitlong(&bytes[CMT_I], direntry->comment);
- splitint(&bytes[CMTSIZ_I], direntry->cmt_size);
- for (i = 0; i < FNM_SIZ; i++)
- bytes[FNAME_I + i] = direntry->fname[i];
- bytes[TZ_I] = NO_TZ; /* assume unknown */
- bytes[NAMLEN_I] = 0;
- bytes[DIRLEN_I] = 0;
-
- cursize = SIZ_DIR; /* to count size of directory */
- fixsize = SIZ_DIR; /* size of fixed part */
- assert (direntry->type <= 2);
- if (direntry->type == 2) { /* handle stuff relevant to type 2 */
- cursize = SIZ_DIRL;
- fixsize = SIZ_DIRL;
- bytes[TZ_I] = direntry->tz;
- assert(direntry->namlen < 256 && direntry->namlen >= 0);
- if (direntry->namlen > 0 || direntry->dirlen > 0)
- cursize += 2; /* space for namlen and dirlen */
- if (direntry->namlen > 0) {
- bytes[NAMLEN_I] = direntry->namlen;
- for (i = 0; i < direntry->namlen; i++)
- bytes[LFNAME_I+i] = direntry->lfname[i];
- cursize += direntry->namlen;
- }
- assert(direntry->dirlen < 256 && direntry->dirlen >= 0);
- if (direntry->dirlen > 0) {
- bytes[DIRLEN_I] = direntry->dirlen;
- for (i = 0; i < direntry->dirlen; i++)
- bytes[cursize+i] = direntry->dirname[i];
- cursize += direntry->dirlen;
- }
- splitint(&bytes[cursize], direntry->system_id);
- }
-
- /* Total length of directory entry is now cursize. */
- splitint(&bytes[VARDIRLEN_I], cursize - fixsize);
- assert(cursize ==
- ((bytes[DIRLEN_I] > 0 || bytes[NAMLEN_I] > 0) ? 2 : 0) +
- fixsize + bytes[DIRLEN_I] + bytes[NAMLEN_I]
- );
-
- /* Do CRC assuming CRC field is zero, and stuff CRC into field. */
- splitint(&bytes[DCRC_I], 0); /* fill with zeroes */
- crccode = 0;
- addbfcrc(bytes, cursize); /* update CRC */
- splitint(&bytes[DCRC_I], crccode);
-
- /* return total length of directory entry */
- return (cursize);
-
-
- } /* dir_to_b() */
- #endif /* ifndef FIZ */
-
- /* b_to_dir() converts bytes to directory entry structure. The CRC of the
- directory bytes, if any, is checked and a zero or nonzero value is returned
- in direntry->dir_crc according as the check is good or bad */
-
- void b_to_dir(direntry, bytes)
- struct direntry *direntry;
- BYTE bytes[];
- {
- int i;
- unsigned int savecrc;
- direntry->zoo_tag = to_long(&bytes[DTAG_I]);
- direntry->type = bytes[DTYP_I];
- direntry->packing_method = bytes[PKM_I];
- direntry->next = to_long(&bytes[NXT_I]);
- direntry->offset = to_long(&bytes[OFS_I]);
- direntry->date = to_int(&bytes[DAT_I]);
- direntry->time = to_int(&bytes[TIM_I]);
- direntry->file_crc = to_int(&bytes[CRC_I]);
- direntry->org_size = to_long(&bytes[ORGS_I]);
- direntry->size_now = to_long(&bytes[SIZNOW_I]);
- direntry->major_ver = bytes[DMAJ_I];
- direntry->minor_ver = bytes[DMIN_I];
- direntry->deleted = bytes[DEL_I];
- direntry->struc = bytes[STRUC_I];
- direntry->comment = to_long(&bytes[CMT_I]);
- direntry->cmt_size = to_int(&bytes[CMTSIZ_I]);
- for (i = 0; i < FNM_SIZ; i++)
- direntry->fname[i] = bytes[FNAME_I + i];
-
- /* start by assuming variable part is zero bytes */
- direntry->var_dir_len = direntry->dir_crc = 0;
- direntry->namlen = direntry->dirlen = 0;
- direntry->lfname[0] = direntry->dirname[0] = '\0';
- direntry->tz = NO_TZ; /* assume unknown */
- direntry->system_id = SYSID_NIX; /* default system_id if not present */
-
- assert (direntry->type <= 2);
- if (direntry->type == 2) {
- direntry->var_dir_len = to_int(&bytes[VARDIRLEN_I]);
- assert(direntry->var_dir_len <= MAXDIRSIZE);
- if (direntry->var_dir_len > MAXDIRSIZE)
- direntry->var_dir_len = MAXDIRSIZE;
- direntry->tz = bytes[TZ_I];
- if (direntry->var_dir_len > 0)
- direntry->namlen = bytes[NAMLEN_I];
- if (direntry->var_dir_len > 1)
- direntry->dirlen = bytes[DIRLEN_I];
- for (i = 0; i < direntry->namlen; i++)
- direntry->lfname[i] = bytes[LFNAME_I + i];
- for (i = 0; i < direntry->dirlen; i++)
- direntry->dirname[i] = bytes[DIRNAME_I + direntry->namlen + i];
- if (direntry->var_dir_len > direntry->namlen + direntry->dirlen + 2) {
- direntry->system_id = to_int(&bytes[DIRNAME_I+direntry->namlen+i]);
- }
- /* do CRC calculation */
- savecrc = (unsigned int) to_int(&bytes[DCRC_I]);
- crccode = 0;
- splitint(&bytes[DCRC_I], 0);
- addbfcrc(bytes, SIZ_DIRL + direntry->var_dir_len);
- direntry->dir_crc = crccode - savecrc;
- }
- }
-
- #ifdef DEBUG
- /* dump contents of archive header */
- show_h (zoo_header)
- struct zoo_header *zoo_header;
- {
- int i;
- printf ("Header text:\n");
- for (i = 0; i < SIZ_TEXT-1; i++) /* all but trailing ^Z */
- putchar(zoo_header->text[i]);
- putchar('\n');
- printf ("zoo_tag = [%8lx] zoo_start = [%8lx] zoo_minus = [%8lx]\n",
- zoo_header->zoo_tag, zoo_header->zoo_start,
- zoo_header->zoo_minus);
- printf ("major_ver.minor_ver = [%d.%d]\n",
- zoo_header->major_ver, zoo_header->minor_ver);
- printf ("---------\n");
- }
-
- /* dump contents of directory entry */
- show_dir (direntry)
- struct direntry *direntry;
- {
- int i;
- printf ("Directory entry for file [%s][%s]:\n",
- direntry->fname, direntry->lfname);
- printf ("tag = [%8lx] type = [%d] PM = [%d] Next = [%8lx] Offset = [%8lx]\n",
- direntry->zoo_tag, (int) direntry->type,
- (int) direntry->packing_method, direntry->next,
- direntry->offset);
- printf ("Orig size = [%ld] Size now = [%ld] dmaj_v.dmin_v = [%d.%d]\n",
- direntry->org_size, direntry->size_now,
- (int) direntry->major_ver, (int) direntry->minor_ver);
- printf ("Struc = [%d] DEL = [%d] comment_offset = [%8lx] cmt_size = [%d]\n",
- (int) direntry->struc, (int) direntry->deleted, direntry->comment,
- direntry->cmt_size);
- printf ("var_dir_len = [%d] TZ = [%d] dir_crc = [%4x]\n",
- direntry->var_dir_len, (int) direntry->tz, direntry->dir_crc);
- printf ("system_id = [%d] dirlen = [%d] namlen = [%d]\n",
- direntry->system_id, direntry->dirlen, direntry->namlen);
- if (direntry->dirlen > 0)
- printf ("dirname = [%s]\n", direntry->dirname);
- printf ("---------\n");
- }
- #endif /* DEBUG */
-
- #endif /* PORTABLE */
-