/* 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 #endif #include #include #include #include #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 , 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