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PORTABLE.C
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1987-02-07
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#include "options.h"
/*
Copyright (C) 1986 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 MSC
/**********************
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);
}
#ifdef COMMENT
/**********************
strupr() converts a string to uppercase and returns a pointer to the string
*/
char *strupr (str)
char *str;
{
register char *s;
s = str;
while (*s != '\0') {
*s = toascii(*s);
if (islower(*s))
*s = toupper(*s);
s++;
}
return (str);
}
#endif /* COMMENT */
/**********************
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));
}
/**********************
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;
}
}
/**********************
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));
}
/**********************
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 /* ifndef MSC */
/***********************************************************************/
/*** 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 */