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340 lines
7.0 KiB
340 lines
7.0 KiB
/***
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**
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** Module: FReader
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**
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** Description:
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** This is a module of the T1 to TT font converter. The module
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** contains functions that decodes and decrypts the data of a
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** T1 font file.
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**
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** Author: Michael Jansson
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**
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** Created: 5/26/93
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**
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***/
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/**** INCLUDES */
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/* General types and definitions. */
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#include <ctype.h>
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#include <string.h>
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/* Special types and definitions. */
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#include "titott.h"
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#include "types.h"
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#include "safemem.h"
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#include "t1msg.h"
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/* Module dependent types and prototypes. */
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#include "freader.h"
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#include "pfb.h"
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/***** LOCAL TYPES */
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struct FontFile {
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/* Low-level I/O functions. */
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errcode (FASTCALL *fclose)(struct t1file *);
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short (FASTCALL *fgetc)(struct t1file *);
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struct t1file *(*fopen)(const char *);
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boolean (FASTCALL *fstatus)(const struct t1file *);
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struct t1file *io;
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/* Font file state. */
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enum {prolog, eexec} state;
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short nextbyte;
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USHORT r;
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};
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/***** CONSTANTS */
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static const USHORT c1 = 52845;
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static const USHORT c2 = 22719;
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/***** MACROS */
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#define IOGetByte(f) ((*f->fgetc)(f->io))
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#define IOError(f) ((*f->fstatus)(f->io))
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#define IOOpen(f,n) ((*f->fopen)(n))
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#define IOClose(f) ((*f->fclose)(f->io))
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#define SetNextByte(ff, b) ff->nextbyte = (b)
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#define NextByte(ff) (ff->nextbyte)
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#define Eexec(ff) (boolean)(ff->state == eexec)
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#define StartEexec(ff) ff->state = eexec
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/***** STATIC FUNCTIONS */
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/*-none-*/
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/***** FUNCTIONS */
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/***
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** Function: GetByte
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**
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** Description:
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** Pull one byte out of the T1 font file.
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***/
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short FASTCALL GetByte(struct FontFile *ff)
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{
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short b, nb;
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b = IOGetByte(ff);
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/* Decrypt it? */
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if (Eexec(ff))
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b = (short)Decrypt(&ff->r, (UBYTE)b);
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/* Record look-a-head */
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nb = NextByte(ff);
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SetNextByte(ff, b);
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return nb;
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}
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/***
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** Function: GetNewLine
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**
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** Description:
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** Pull one whole line from the T1 font file, starting at
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** the current position.
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***/
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char *GetNewLine(struct FontFile *ff, char *buf, const USHORT len)
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{
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short i = 0;
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/* Get string. */
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while ((buf[i] = (char)GetByte(ff))!='\n' &&
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buf[i]!='\r' && ++i<((short)len-1));
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/* Skip extra characters. */
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if (buf[i]!='\n' && buf[i]!='\r')
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while (!IOError(ff) && NextByte(ff)!='\n' && NextByte(ff)!='\r')
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(void)GetByte(ff);
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/* Terminate string. */
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buf[i] = '\0';
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/* Check for the start of the eexec section. */
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if (!strcmp(buf, "eexec"))
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StartEexec(ff);
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/* Check error condition. */
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if (IOError(ff))
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return NULL;
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return buf;
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}
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/***
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** Function: Get_Token
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**
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** Description:
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** Pull one token from the T1 font file. A token
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** is delimited by white space and various brackets.
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***/
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char *Get_Token(struct FontFile *ff, char *buf, const USHORT len)
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{
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short i = 0;
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short nb;
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/* Skip leading blanks. */
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while (isspace(NextByte(ff)))
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(void)GetByte(ff);
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/* Get string. */
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do {
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buf[i] = (char)GetByte(ff);
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nb = NextByte(ff);
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} while (++i<((short)len-1) && !isspace(nb) && nb!='{' &&
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nb!='(' && nb!='[' && nb!='/');
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/* Skip extra characters. */
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while (!IOError(ff) && !isspace(nb) && nb!='{' &&
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nb!='(' && nb!='[' && nb!='/') {
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(void)GetByte(ff);
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nb = NextByte(ff);
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}
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/* Terminate string. */
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buf[i] = '\0';
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/* Check for the start of the eexec section. */
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if (!strcmp(buf, "eexec"))
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StartEexec(ff);
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/* Check error condition. */
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if (IOError(ff))
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return NULL;
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return buf;
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}
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/***
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** Function: GetSeq
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**
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** Description:
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** Pull one sequence of bytes that are delimited by
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** a given pair of characters, e.g. '[' and ']'.
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***/
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char *GetSeq(struct FontFile *ff,
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char *buf,
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const USHORT len)
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{
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char d1, d2;
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short i = 0;
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short inside = 0;
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/* Skip leading blanks. */
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while (NextByte(ff)!='[' &&
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NextByte(ff)!='{' &&
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NextByte(ff)!='(' &&
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!IOError(ff))
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(void)GetByte(ff);
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/* match the bracket. */
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d1 = (char)NextByte(ff);
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if (d1=='[')
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d2 = ']';
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else if (d1=='{')
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d2 = '}';
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else if (d1=='(')
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d2 = ')';
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else
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return NULL;
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/* Get string. */
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(void)GetByte(ff);
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inside=1;
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do {
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buf[i] = (char)GetByte(ff);
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if (buf[i]==d1)
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inside++;
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if (buf[i]==d2)
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inside--;
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} while (inside && ++i<((short)len-1));
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/* Terminate string. */
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buf[i] = '\0';
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/* Check error condition. */
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if (IOError(ff))
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return NULL;
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return buf;
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}
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/***
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** Function: FRInit
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**
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** Description:
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** Initite the resources needed to read/decode data from
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** a T1 font file.
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***/
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errcode FRInit(const char *name, const enum ftype type, struct FontFile **ff)
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{
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errcode status = SUCCESS;
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short b;
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if (((*ff)=(struct FontFile *)Malloc(sizeof(struct FontFile)))==NULL) {
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SetError(status = NOMEM);
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} else {
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/* Initiat the handle. */
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memset((*ff), '\0', sizeof(**ff));
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/* Initiate low-level I/O. */
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switch (type) {
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case pfb_file:
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(*ff)->fgetc = PFBGetByte;
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(*ff)->fclose = PFBFreeIOBlock;
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(*ff)->fstatus = PFBFileError;
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(*ff)->fopen = PFBAllocIOBlock;
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break;
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case mac_file:
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#if MACFILEFORMAT
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(*ff)->fgetc = MACGetByte;
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(*ff)->fclose = MACFreeIOBlock;
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(*ff)->fstatus = MACFileError;
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(*ff)->fopen = MACAllocIOBlock;
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break;
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#endif
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case ascii_file:
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#if ASCIIFILEFORMAT
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(*ff)->fgetc = ASCIIGetByte;
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(*ff)->fclose = ASCIIFreeIOBlock;
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(*ff)->fstatus = ASCIFileError;
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(*ff)->fopen = ASCIIAllocIOBlock;
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break;
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#endif
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default:
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LogError(MSG_ERROR, MSG_BADFMT, NULL);
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SetError(status = BADINPUTFILE);
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break;
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}
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(*ff)->io = NULL;
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if (((*ff)->io = IOOpen((*ff),name))==NULL) {
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SetError(status = BADINPUTFILE);
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} else {
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(*ff)->state = prolog;
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(*ff)->r = 55665;
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b=GetByte(*ff);
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SetNextByte((*ff), b);
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}
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}
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return status;
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}
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/***
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** Function: FRCleanUp
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**
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** Description:
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** Free the resources used when reading/decoding data from
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** a T1 font file.
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***/
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errcode FRCleanUp(struct FontFile *ff)
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{
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errcode status = SUCCESS;
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if (ff) {
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if (ff->io)
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status = IOClose(ff);
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Free(ff);
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}
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return status;
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}
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/***
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** Function: Decrypt
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**
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** Description:
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** Decrypt a byte.
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***/
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UBYTE FASTCALL Decrypt(USHORT *r, const UBYTE cipher)
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{
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UBYTE plain;
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plain = (UBYTE)(cipher ^ (*r>>8));
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*r = (USHORT)((cipher+*r) * c1 + c2);
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return plain;
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}
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