--- /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