+++ /dev/null
-/* $XConsortium: t1io.c,v 1.10 95/06/09 22:29:35 gildea Exp $ */
-/* Copyright International Business Machines,Corp. 1991
- * All Rights Reserved
- *
- * License to use, copy, modify, and distribute this software
- * and its documentation for any purpose and without fee is
- * hereby granted, provided that the above copyright notice
- * appear in all copies and that both that copyright notice and
- * this permission notice appear in supporting documentation,
- * and that the name of IBM not be used in advertising or
- * publicity pertaining to distribution of the software without
- * specific, written prior permission.
- *
- * IBM PROVIDES THIS SOFTWARE "AS IS", WITHOUT ANY WARRANTIES
- * OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT
- * LIMITED TO ANY IMPLIED WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT OF
- * THIRD PARTY RIGHTS. THE ENTIRE RISK AS TO THE QUALITY AND
- * PERFORMANCE OF THE SOFTWARE, INCLUDING ANY DUTY TO SUPPORT
- * OR MAINTAIN, BELONGS TO THE LICENSEE. SHOULD ANY PORTION OF
- * THE SOFTWARE PROVE DEFECTIVE, THE LICENSEE (NOT IBM) ASSUMES
- * THE ENTIRE COST OF ALL SERVICING, REPAIR AND CORRECTION. IN
- * NO EVENT SHALL IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR
- * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
- * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
- * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
- * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
- * SOFTWARE.
- * Author: Carol H. Thompson IBM Almaden Research Center
- */
-/*******************************************************************
-* I/O package for Type 1 font reading
-********************************************************************/
-
-#ifndef STATIC
-#define STATIC static
-#endif
-
-#include <fcntl.h>
-#include "t1stdio.h"
-#include "t1hdigit.h"
-#ifdef WIN32
-#include <X11/Xw32defs.h>
-#endif
-
-/* Constants and variables used in the decryption */
-#define c1 ((unsigned short)52845)
-#define c2 ((unsigned short)22719)
-static unsigned short r;
-static int asc, Decrypt;
-static int extrach;
-static int haveextrach;
-
-/* Our single FILE structure and buffer for this package */
-STATIC F_FILE TheFile;
-STATIC unsigned char TheBuffer[F_BUFSIZ];
-
-/* Our routines */
-F_FILE *T1Open(), *T1Eexec();
-int T1Close();
-int T1Read(), T1Getc(), T1Ungetc();
-STATIC int T1Decrypt(), T1Fill();
-
-/* -------------------------------------------------------------- */
-/*ARGSUSED*/
-F_FILE *T1Open(fn, mode)
- char *fn; /* Pointer to filename */
- char *mode; /* Pointer to open mode string */
-{
- F_FILE *of = &TheFile;
- int oflags = O_RDONLY; /* We know we are only reading */
-
- Decrypt = 0;
-
-#ifdef O_BINARY /* VMS or DOS */
- oflags |= O_BINARY;
-#endif
- of->fd = open(fn, oflags);
- if (of->fd < 0)
- return NULL;
-
- /* Initialize the buffer information of our file descriptor */
- of->b_base = TheBuffer;
- of->b_size = F_BUFSIZ;
- of->b_ptr = NULL;
- of->b_cnt = 0;
- of->flags = 0;
- of->error = 0;
- haveextrach = 0;
- return &TheFile;
-} /* end Open */
-
-/* -------------------------------------------------------------- */
-int T1Getc(f) /* Read one character */
- F_FILE *f; /* Stream descriptor */
-{
- if (f->b_base == NULL) return EOF; /* already closed */
-
- if (f->flags & UNGOTTENC) { /* there is an ungotten c */
- f->flags &= ~UNGOTTENC;
- return (int) f->ungotc;
- }
-
- if (f->b_cnt == 0) /* Buffer needs to be (re)filled */
- f->b_cnt = T1Fill(f);
- if (f->b_cnt > 0) return (f->b_cnt--, (int) *(f->b_ptr++));
- else {
- f->flags |= FIOEOF;
- return EOF;
- }
-} /* end Getc */
-
-/* -------------------------------------------------------------- */
-int T1Ungetc(c, f) /* Put back one character */
- int c;
- F_FILE *f; /* Stream descriptor */
-{
- if (c != EOF) {
- f->ungotc = c;
- f->flags |= UNGOTTENC; /* set flag */
- f->flags &= ~FIOEOF; /* reset EOF */
- }
- return c;
-} /* end Ungetc */
-
-/* -------------------------------------------------------------- */
-int T1Read(buffP, size, n, f) /* Read n items into caller's buffer */
- char *buffP; /* Buffer to be filled */
- int size; /* Size of each item */
- int n; /* Number of items to read */
- F_FILE *f; /* Stream descriptor */
-{
- int bytelen, cnt, i;
- F_char *p = (F_char *)buffP;
- int icnt; /* Number of characters to read */
-
- if (f->b_base == NULL) return 0; /* closed */
- icnt = (size!=1)?n*size:n; /* Number of bytes we want */
-
- if (f->flags & UNGOTTENC) { /* there is an ungotten c */
- f->flags &= ~UNGOTTENC;
- *(p++) = f->ungotc;
- icnt--; bytelen = 1;
- }
- else bytelen = 0;
-
- while (icnt > 0) {
- /* First use any bytes we have buffered in the stream buffer */
- if ((cnt=f->b_cnt) > 0) {
- if (cnt > icnt) cnt = icnt;
- for (i=0; i<cnt; i++) *(p++) = *(f->b_ptr++);
- f->b_cnt -= cnt;
- icnt -= cnt;
- bytelen += cnt;
- }
-
- if ((icnt == 0) || (f->flags & FIOEOF)) break;
-
- f->b_cnt = T1Fill(f);
- }
- return ((size!=1)?bytelen/size:bytelen);
-} /* end Read */
-
-/* -------------------------------------------------------------- */
-int T1Close(f) /* Close the file */
- F_FILE *f; /* Stream descriptor */
-{
- if (f->b_base == NULL) return 0; /* already closed */
- f->b_base = NULL; /* no valid stream */
- return close(f->fd);
-} /* end Close */
-
-#ifdef __STDC__
-#define pointer void *
-#else
-#define pointer char *
-#endif
-
-/* -------------------------------------------------------------- */
-F_FILE *T1eexec(f) /* Initialization */
- F_FILE *f; /* Stream descriptor */
-{
- int i, c;
- int H;
- unsigned char *p;
- unsigned char randomP[8];
-
- r = 55665; /* initial key */
- asc = 1; /* indicate ASCII form */
-
- /* Consume the 4 random bytes, determining if we are also to
- ASCIIDecodeHex as we process our input. (See pages 63-64
- of the Adobe Type 1 Font Format book.) */
-
- /* Skip over any initial white space chars */
- while (HighHexP[c=getc(f)] == HWHITE_SPACE) ;
-
- /* If ASCII, the next 7 chars are guaranteed consecutive */
- randomP[0] = c; /* store first non white space char */
- fread((pointer)(randomP+1), 1, 3, f); /* read 3 more, for a total of 4 */
- /* store first four chars */
- for (i=0,p=randomP; i<4; i++) { /* Check 4 valid ASCIIEncode chars */
- if (HighHexP[*p++] > LAST_HDIGIT) { /* non-ASCII byte */
- asc = 0;
- break;
- }
- }
- if (asc) { /* ASCII form, convert first eight bytes to binary */
- fread((pointer)(randomP+4), 1, 4, f); /* Need four more */
- for (i=0,p=randomP; i<4; i++) { /* Convert */
- H = HighHexP[*p++];
- randomP[i] = H | LowHexP[*p++];
- }
- }
-
- /* Adjust our key */
- for (i=0,p=randomP; i<4; i++) {
- r = (*p++ + r) * c1 + c2;
- }
-
- /* Decrypt the remaining buffered bytes */
- f->b_cnt = T1Decrypt(f->b_ptr, f->b_cnt);
- Decrypt = 1;
- return (feof(f))?NULL:f;
-} /* end eexec */
-
-/* -------------------------------------------------------------- */
-STATIC int T1Decrypt(p, len)
- unsigned char *p;
- int len;
-{
- int n;
- int H, L;
- unsigned char *inp = p;
- unsigned char *tblP;
-
- if (asc) {
- if (haveextrach) {
- H = extrach;
- tblP = LowHexP;
- }
- else tblP = HighHexP;
- for (n=0; len>0; len--) {
- L = tblP[*inp++];
- if (L == HWHITE_SPACE) continue;
- if (L > LAST_HDIGIT) break;
- if (tblP == HighHexP) { /* Got first hexit value */
- H = L;
- tblP = LowHexP;
- } else { /* Got second hexit value; compute value and store it */
- n++;
- tblP = HighHexP;
- H |= L;
- /* H is an int, 0 <= H <= 255, so all of this will work */
- *p++ = H ^ (r >> 8);
- r = (H + r) * c1 + c2;
- }
- }
- if (tblP != HighHexP) { /* We had an odd number of hexits */
- extrach = H;
- haveextrach = 1;
- } else haveextrach = 0;
- return n;
- } else {
- for (n = len; n>0; n--) {
- H = *inp++;
- *p++ = H ^ (r >> 8);
- r = (H + r) * c1 + c2;
- }
- return len;
- }
-} /* end Decrypt */
-
-/* -------------------------------------------------------------- */
-STATIC int T1Fill(f) /* Refill stream buffer */
- F_FILE *f; /* Stream descriptor */
-{
- int rc;
-
- rc = read(f->fd, f->b_base, F_BUFSIZ);
- /* propagate any error or eof to current file */
- if (rc <= 0) {
- if (rc == 0) /* means EOF */
- f->flags |= FIOEOF;
- else {
- f->error = (short)-rc;
- f->flags |= FIOERROR;
- rc = 0;
- }
- }
- f->b_ptr = f->b_base;
- if (Decrypt) rc = T1Decrypt(f->b_base, rc);
- return rc;
-} /* end Fill */
projects / rdpsrv / blobdiff