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/* t1lib
*
* This file contains functions for reading PFA and PFB files.
*
* Copyright (c) 1998-2013 Eddie Kohler
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, subject to the
* conditions listed in the Click LICENSE file, which is available in full at
* http://github.com/kohler/click/blob/master/LICENSE. The conditions
* include: you must preserve this copyright notice, and you cannot mention
* the copyright holders in advertising related to the Software without
* their permission. The Software is provided WITHOUT ANY WARRANTY, EXPRESS
* OR IMPLIED. This notice is a summary of the Click LICENSE file; the
* license in that file is binding.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include "t1lib.h"
#ifdef __cplusplus
extern "C" {
#endif
#define PFA_ASCII 1
#define PFA_EEXEC_TEST 2
#define PFA_HEX 3
#define PFA_BINARY 4
/* This function returns the value (0-15) of a single hex digit. It returns
0 for an invalid hex digit. */
static int
hexval(char c)
{
if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
else if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
else if (c >= '0' && c <= '9')
return c - '0';
else
return 0;
}
/* This function translates a string of hexadecimal digits into binary data.
We allow an odd number of digits. Returns length of binary data. */
static int
translate_hex_string(char *s, char *saved_orphan)
{
int c1 = *saved_orphan;
char *start = s;
char *t = s;
for (; *s; s++) {
if (isspace((unsigned char) *s))
continue;
if (c1) {
*t++ = (hexval(c1) << 4) + hexval(*s);
c1 = 0;
} else
c1 = *s;
}
*saved_orphan = c1;
return t - start;
}
/* This function returns 1 if the string contains all '0's. */
static int
all_zeroes(char *s)
{
if (*s == '\0' || *s == '\n')
return 0;
while (*s == '0')
s++;
return *s == '\0' || *s == '\n';
}
/* This function handles the entire file. */
#define LINESIZE 1024
void
process_pfa(FILE *ifp, const char *ifp_filename, struct font_reader *fr)
{
/* Loop until no more input. We need to look for `currentfile eexec' to
start eexec section (hex to binary conversion) and line of all zeros to
switch back to ASCII. */
/* Don't use fgets() in case line-endings are indicated by bare \r's, as
occurs in Macintosh fonts. */
/* 2.Aug.1999 - At the behest of Tom Kacvinsky <tjk@ams.org>, support
binary PFA fonts. */
char buffer[LINESIZE];
int c = 0;
int blocktyp = PFA_ASCII;
char saved_orphan = 0;
(void)ifp_filename;
while (c != EOF) {
char *line = buffer, *last = buffer;
int crlf = 0;
c = getc(ifp);
while (c != EOF && c != '\r' && c != '\n' && last < buffer + LINESIZE - 1) {
*last++ = c;
c = getc(ifp);
}
/* handle the end of the line */
if (last == buffer + LINESIZE - 1)
/* buffer overrun: don't append newline even if we have it */
ungetc(c, ifp);
else if (c == '\r' && blocktyp != PFA_BINARY) {
/* change CR or CR/LF into LF, unless reading binary data! (This
condition was wrong before, caused Thanh problems -
6.Mar.2001) */
c = getc(ifp);
if (c != '\n')
ungetc(c, ifp), crlf = 1;
else
crlf = 2;
*last++ = '\n';
} else if (c != EOF)
*last++ = c;
*last = 0;
/* now that we have the line, handle it */
if (blocktyp == PFA_ASCII) {
if (strncmp(line, "currentfile eexec", 17) == 0 && isspace((unsigned char) line[17])) {
char saved_p;
/* assert(line == buffer); */
for (line += 18; isspace((unsigned char) *line); line++)
/* nada */;
saved_p = *line;
*line = 0;
fr->output_ascii(buffer, line - buffer);
*line = saved_p;
blocktyp = PFA_EEXEC_TEST;
if (!*line)
continue;
} else {
fr->output_ascii(line, last - line);
continue;
}
}
/* check immediately after "currentfile eexec" for ASCII or binary */
if (blocktyp == PFA_EEXEC_TEST) {
/* 8.Feb.2004: fix bug if first character in a binary eexec block
is 0, reported by Werner Lemberg */
for (; line < last && isspace((unsigned char) *line); line++)
/* nada */;
if (line == last)
continue;
else if (last >= line + 4 && isxdigit((unsigned char) line[0])
&& isxdigit((unsigned char) line[1])
&& isxdigit((unsigned char) line[2])
&& isxdigit((unsigned char) line[3]))
blocktyp = PFA_HEX;
else
blocktyp = PFA_BINARY;
memmove(buffer, line, last - line + 1);
last = buffer + (last - line);
line = buffer;
/* patch up crlf fix */
if (blocktyp == PFA_BINARY && crlf) {
last[-1] = '\r';
if (crlf == 2)
*last++ = '\n';
}
}
/* blocktyp == PFA_HEX || blocktyp == PFA_BINARY */
if (all_zeroes(line)) { /* XXX not safe */
fr->output_ascii(line, last - line);
blocktyp = PFA_ASCII;
} else if (blocktyp == PFA_HEX) {
int len = translate_hex_string(line, &saved_orphan);
if (len)
fr->output_binary((unsigned char *)line, len);
} else
fr->output_binary((unsigned char *)line, last - line);
}
fr->output_end();
}
/* Process a PFB file. */
/* XXX Doesn't handle "currentfile eexec" as intelligently as process_pfa
does. */
static int
handle_pfb_ascii(struct font_reader *fr, char *line, int len)
{
/* Divide PFB_ASCII blocks into lines */
int start = 0;
while (1) {
int pos = start;
while (pos < len && line[pos] != '\n' && line[pos] != '\r')
pos++;
if (pos >= len) {
if (pos == start)
return 0;
else if (start == 0 && pos == LINESIZE - 1) {
line[pos] = 0;
fr->output_ascii(line, pos);
return 0;
} else {
memmove(line, line + start, pos - start);
return pos - start;
}
} else if (pos < len - 1 && line[pos] == '\r' && line[pos+1] == '\n') {
line[pos] = '\n';
line[pos+1] = 0;
fr->output_ascii(line + start, pos + 1 - start);
start = pos + 2;
} else {
char save = line[pos+1];
line[pos] = '\n';
line[pos+1] = 0;
fr->output_ascii(line + start, pos + 1 - start);
line[pos+1] = save;
start = pos + 1;
}
}
}
void
process_pfb(FILE *ifp, const char *ifp_filename, struct font_reader *fr)
{
int blocktyp = 0;
unsigned block_len = 0;
int c = 0;
unsigned filepos = 0;
int linepos = 0;
char line[LINESIZE];
while (1) {
while (block_len == 0) {
c = getc(ifp);
blocktyp = getc(ifp);
if (c != PFB_MARKER
|| (blocktyp != PFB_ASCII && blocktyp != PFB_BINARY
&& blocktyp != PFB_DONE)) {
if (c == EOF || blocktyp == EOF)
error("%s corrupted: no end-of-file marker", ifp_filename);
else
error("%s corrupted: bad block marker at position %u",
ifp_filename, filepos);
blocktyp = PFB_DONE;
}
if (blocktyp == PFB_DONE)
goto done;
block_len = getc(ifp) & 0xFF;
block_len |= (getc(ifp) & 0xFF) << 8;
block_len |= (getc(ifp) & 0xFF) << 16;
block_len |= (unsigned) (getc(ifp) & 0xFF) << 24;
if (feof(ifp)) {
error("%s corrupted: bad block length at position %u",
ifp_filename, filepos);
blocktyp = PFB_DONE;
goto done;
}
filepos += 6;
}
/* read the block in its entirety, in LINESIZE chunks */
while (block_len > 0) {
unsigned rest = LINESIZE - 1 - linepos; /* leave space for '\0' */
unsigned n = (block_len > rest ? rest : block_len);
int actual = fread(line + linepos, 1, n, ifp);
if (actual != (int) n) {
error("%s corrupted: block short by %u bytes at position %u",
ifp_filename, block_len - actual, filepos);
block_len = actual;
}
if (blocktyp == PFB_BINARY)
fr->output_binary((unsigned char *)line, actual);
else
linepos = handle_pfb_ascii(fr, line, linepos + actual);
block_len -= actual;
filepos += actual;
}
/* handle any leftover line */
if (linepos > 0) {
line[linepos] = 0;
fr->output_ascii(line, linepos);
linepos = 0;
}
}
done:
c = getc(ifp);
if (c != EOF)
error("%s corrupted: data after PFB end marker at position %u",
ifp_filename, filepos - 2);
fr->output_end();
}
#define DEFAULT_BLOCKLEN (1L<<12)
void
init_pfb_writer(struct pfb_writer *w, int blocklen, FILE *f)
{
w->len = DEFAULT_BLOCKLEN;
w->buf = (unsigned char *)malloc(w->len);
if (!w->buf)
fatal_error("out of memory");
w->max_len = (blocklen <= 0 ? 0xFFFFFFFFU : (unsigned)blocklen);
w->pos = 0;
w->blocktyp = PFB_ASCII;
w->binary_blocks_written = 0;
w->f = f;
}
void
pfb_writer_output_block(struct pfb_writer *w)
{
/* do nothing if nothing in block */
if (w->pos == 0)
return;
/* output four-byte block length */
putc(PFB_MARKER, w->f);
putc(w->blocktyp, w->f);
putc((int)(w->pos & 0xff), w->f);
putc((int)((w->pos >> 8) & 0xff), w->f);
putc((int)((w->pos >> 16) & 0xff), w->f);
putc((int)((w->pos >> 24) & 0xff), w->f);
/* output block data */
fwrite(w->buf, 1, w->pos, w->f);
/* mark block buffer empty and uninitialized */
w->pos = 0;
if (w->blocktyp == PFB_BINARY)
w->binary_blocks_written++;
}
void
pfb_writer_grow_buf(struct pfb_writer *w)
{
if (w->len < w->max_len) {
/* grow w->buf */
unsigned new_len = w->len * 2;
unsigned char *new_buf;
if (new_len > w->max_len)
new_len = w->max_len;
new_buf = (unsigned char *)malloc(new_len);
if (!new_buf) {
error("out of memory; continuing with a smaller block size");
w->max_len = w->len;
pfb_writer_output_block(w);
} else {
memcpy(new_buf, w->buf, w->len);
free(w->buf);
w->buf = new_buf;
w->len = new_len;
}
} else
/* buf already the right size, just output the block */
pfb_writer_output_block(w);
}
void
pfb_writer_end(struct pfb_writer *w)
{
if (w->pos)
pfb_writer_output_block(w);
putc(PFB_MARKER, w->f);
putc(PFB_DONE, w->f);
}
/* This CRC table and routine were borrowed from macutils-2.0b3 */
static unsigned short crctab[256] = {
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0,
};
/*
* Update a CRC check on the given buffer.
*/
int
crcbuf(int crc, unsigned int len, const char *buf)
{
const unsigned char *ubuf = (const unsigned char *)buf;
while (len--)
crc = ((crc << 8) & 0xFF00) ^ crctab[((crc >> 8) & 0xFF) ^ *ubuf++];
return crc;
}
#ifdef __cplusplus
}
#endif
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