1 /*****************************************************************************/
5 /* Main program of the chrcvt vector font converter */
9 /* (C) 2000-2009, Ullrich von Bassewitz */
10 /* Roemerstrasse 52 */
11 /* D-70794 Filderstadt */
12 /* EMail: uz@cc65.org */
15 /* This software is provided 'as-is', without any expressed or implied */
16 /* warranty. In no event will the authors be held liable for any damages */
17 /* arising from the use of this software. */
19 /* Permission is granted to anyone to use this software for any purpose, */
20 /* including commercial applications, and to alter it and redistribute it */
21 /* freely, subject to the following restrictions: */
23 /* 1. The origin of this software must not be misrepresented; you must not */
24 /* claim that you wrote the original software. If you use this software */
25 /* in a product, an acknowledgment in the product documentation would be */
26 /* appreciated but is not required. */
27 /* 2. Altered source versions must be plainly marked as such, and must not */
28 /* be misrepresented as being the original software. */
29 /* 3. This notice may not be removed or altered from any source */
32 /*****************************************************************************/
55 * The following is a corrected doc from the BGI font editor toolkit:
57 * BGI Stroke File Format
59 * The structure of Borland .CHR (stroke) files is as follows:
61 * ; offset 0h is a Borland header:
64 * DataSize equ (size of font file)
65 * descr equ "Triplex font"
71 * db 'BGI ',descr,' V'
73 * db (MinorVersion / 10)+'0',(MinorVersion mod 10)+'0'
74 * db ' - 19 October 1987',0DH,0AH
75 * db 'Copyright (c) 1987 Borland International', 0dh,0ah
76 * db 0,1ah ; null & ctrl-Z = end
78 * dw HeaderSize ; size of header
79 * db fname ; font name
80 * dw DataSize ; font file size
81 * db MajorVersion,MinorVersion ; version #'s
82 * db 1,0 ; minimal version #'s
84 * db (HeaderSize - $) DUP (0) ; pad out to header size
86 * At offset 80h starts data for the file:
88 * ; 80h '+' flags stroke file type
89 * ; 81h-82h number chars in font file (n)
91 * ; 84h ASCII value of first char in file
92 * ; 85h-86h offset to stroke definitions (8+3n)
93 * ; 87h scan flag (normally 0)
94 * ; 88h distance from origin to top of capital
95 * ; 89h distance from origin to baseline
96 * ; 8Ah distance from origin to bottom descender
98 * ; 90h offsets to individual character definitions
99 * ; 90h+2n width table (one word per character)
100 * ; 90h+3n start of character definitions
102 * The individual character definitions consist of a variable number of words
103 * describing the operations required to render a character. Each word
104 * consists of an (x,y) coordinate pair and a two-bit opcode, encoded as shown
107 * Byte 1 7 6 5 4 3 2 1 0 bit #
108 * op1 <seven bit signed X coord>
110 * Byte 2 7 6 5 4 3 2 1 0 bit #
111 * op2 <seven bit signed Y coord>
116 * op1=0 op2=0 End of character definition.
117 * op1=1 op2=0 Move the pointer to (x,y)
118 * op1=1 op2=1 Draw from current pointer to (x,y)
123 /* The target file format is designed to be read by a cc65 compiled program
124 * more easily. It should not be necessary to load the whole file into a
125 * buffer to parse it, or seek within the file. Also using less memory if
126 * possible would be fine. Therefore we use the following structure:
129 * .byte $54, $43, $48, $00 ; "TCH" version
130 * .word <size of data portion>
132 * .byte <top> ; Value from $88
133 * .byte <baseline> ; Value from $89
134 * .byte <bottom> ; Negative value from $8A
135 * .byte <width>, ... ; $5F width bytes
136 * .word <char definition offset>, ... ; $5F char def offsets
137 * Character definitions:
138 * .word <converted opcode>, ...
141 * The opcodes get converted for easier handling: END is marked by bit 7
142 * set in the first byte. The second byte of this opcode is not needed.
143 * Bit 7 of the second byte marks a MOVE (bit 7 = 0) or DRAW (bit 7 = 1).
145 * The number of characters is fixed to $20..$7E (space to tilde), so character
146 * widths and offsets can be stored in fixed size preallocated tables. The
147 * space for the character definitions is allocated on the heap, it's size
148 * is stored in the header.
150 * Above structure allows a program to read the header portion of the file,
151 * validate it, then read the remainder of the file into memory in one chunk.
152 * The character definition offsets will then be converted into pointers by
153 * adding the character definition base pointer to each.
158 /*****************************************************************************/
160 /*****************************************************************************/
164 static unsigned FilesProcessed = 0;
168 /*****************************************************************************/
170 /*****************************************************************************/
174 static void Usage (void)
175 /* Print usage information and exit */
178 "Usage: %s [options] file [options] [file]\n"
180 " -h\t\t\tHelp (this text)\n"
181 " -v\t\t\tBe more verbose\n"
182 " -V\t\t\tPrint the version number and exit\n"
185 " --help\t\tHelp (this text)\n"
186 " --verbose\t\tBe more verbose\n"
187 " --version\t\tPrint the version number and exit\n",
193 static void OptHelp (const char* Opt attribute ((unused)),
194 const char* Arg attribute ((unused)))
195 /* Print usage information and exit */
203 static void OptVerbose (const char* Opt attribute ((unused)),
204 const char* Arg attribute ((unused)))
205 /* Increase verbosity */
212 static void OptVersion (const char* Opt attribute ((unused)),
213 const char* Arg attribute ((unused)))
214 /* Print the assembler version */
217 "%s V%s - (C) Copyright 2009, Ullrich von Bassewitz\n",
218 ProgName, GetVersionAsString ());
223 static void ConvertChar (StrBuf* Data, const unsigned char* Buf)
224 /* Convert data for one character. Original data is in Buf, converted data
225 * will be placed in Data.
228 /* We should check here for reading past the end of the buffer in case the
229 * input data is not sane.
233 /* Get the next op word */
234 unsigned Op = (Buf[0] + (Buf[1] << 8)) & 0x8080;
236 /* Check the opcode */
241 if (SB_IsEmpty (Data)) {
242 /* No ops. We need to add an empty one */
243 SB_AppendChar (Data, 0x00);
244 SB_AppendChar (Data, 0x00);
246 /* Add an end marker to the last op in the buffer */
247 SB_GetBuf (Data)[SB_GetLen (Data) - 2] |= 0x80;
252 SB_AppendChar (Data, Buf[0] & 0x7F);
253 SB_AppendChar (Data, Buf[1] & 0x7F);
258 Error ("Input file contains invalid opcode 0x8000");
263 SB_AppendChar (Data, Buf[0] & 0x7F);
264 SB_AppendChar (Data, Buf[1] | 0x80);
275 static void ConvertFile (const char* Input, const char* Output)
276 /* Convert one vector font file */
278 /* The header of a BGI vector font file */
279 static const unsigned char ChrHeader[] = {
280 0x50, 0x4B, 0x08, 0x08, 0x42, 0x47, 0x49, 0x20
283 /* The header of a TGI vector font file */
284 unsigned char TchHeader[] = {
285 0x54, 0x43, 0x48, 0x00, /* "TCH" version */
286 0x00, 0x00, /* size of char definitions */
294 unsigned char* MsgEnd;
300 const unsigned char* OffsetBuf;
301 const unsigned char* WidthBuf;
302 const unsigned char* VectorBuf;
303 StrBuf Offsets = AUTO_STRBUF_INITIALIZER;
304 StrBuf VectorData = AUTO_STRBUF_INITIALIZER;
307 /* Try to open the file for reading */
308 FILE* F = fopen (Input, "rb");
310 Error ("Cannot open input file `%s': %s", Input, strerror (errno));
313 /* Seek to the end and determine the size */
314 fseek (F, 0, SEEK_END);
317 /* Seek back to the start of the file */
318 fseek (F, 0, SEEK_SET);
320 /* Check if the size is reasonable */
321 if (Size > 32*1024) {
322 Error ("Input file `%s' is too large (max = 32k)", Input);
323 } else if (Size < 0x100) {
324 Error ("Input file `%s' is too small to be a vector font file", Input);
327 /* Allocate memory for the file */
328 Buf = xmalloc ((size_t) Size);
330 /* Read the file contents into the buffer */
331 if (fread (Buf, 1, (size_t) Size, F) != (size_t) Size) {
332 Error ("Error reading from input file `%s'", Input);
338 /* Verify the header */
339 if (memcmp (Buf, ChrHeader, sizeof (ChrHeader)) != 0) {
340 Error ("Invalid format for `%s': invalid header", Input);
342 MsgEnd = memchr (Buf + sizeof (ChrHeader), 0x1A, 0x80);
344 Error ("Invalid format for `%s': description not found", Input);
346 if (MsgEnd[1] != 0x80 || MsgEnd[2] != 0x00) {
347 Error ("Invalid format for `%s': wrong header size", Input);
350 /* We expect the file to hold chars from 0x20 (space) to 0x7E (tilde) */
351 FirstChar = Buf[0x84];
352 CharCount = Buf[0x81] + (Buf[0x82] << 8);
353 LastChar = FirstChar + CharCount - 1;
354 if (FirstChar > 0x20 || LastChar < 0x7E) {
355 Print (stderr, 1, "FirstChar = $%04X, CharCount = %u\n",
356 FirstChar, CharCount);
357 Error ("File `%s' doesn't contain the chars we need", Input);
358 } else if (LastChar >= 0x100) {
359 Error ("File `%s' contains too many character definitions", Input);
362 /* Print the copyright from the header */
363 Print (stderr, 1, "%.*s\n", (int) (MsgEnd - Buf - 4), Buf+4);
365 /* Get pointers to the width table, the offset table and the vector data
366 * table. The first two corrected for 0x20 as first entry.
368 OffsetBuf = Buf + 0x90 + ((0x20 - FirstChar) * 2);
369 WidthBuf = Buf + 0x90 + (CharCount * 2) + (0x20 - FirstChar);
370 VectorBuf = Buf + 0x90 + (CharCount * 3);
372 /* Convert the characters */
373 for (Char = 0x20; Char <= 0x7E; ++Char, OffsetBuf += 2) {
375 /* Add the offset to the offset table */
376 Offs = SB_GetLen (&VectorData);
377 SB_AppendChar (&Offsets, Offs & 0xFF);
378 SB_AppendChar (&Offsets, (Offs >> 8) & 0xFF);
380 /* Get the offset of the vector data in the BGI data buffer */
381 Offs = OffsetBuf[0] + (OffsetBuf[1] << 8);
383 /* Check if the offset is valid */
384 if (Offs + (VectorBuf - Buf) > Size) {
385 Error ("Invalid data offset in input file `%s'", Input);
388 /* Convert the vector data and place it into the buffer */
389 ConvertChar (&VectorData, VectorBuf + Offs);
392 /* Complete the TCH header */
393 Offs = 3 + 0x5F + 2*0x5F + SB_GetLen (&VectorData);
394 TchHeader[4] = Offs & 0xFF;
395 TchHeader[5] = (Offs >> 8) & 0xFF;
396 TchHeader[6] = Buf[0x88];
397 TchHeader[7] = Buf[0x89];
398 TchHeader[8] = (unsigned char) -(signed char)(Buf[0x8A]);
400 /* If the output file is NULL, use the name of the input file with ".tch"
404 Output = MakeFilename (Input, ".tch");
407 /* Open the output file */
408 F = fopen (Output, "wb");
410 Error ("Cannot open output file `%s': %s", Output, strerror (errno));
413 /* Write the header to the output file */
414 if (fwrite (TchHeader, 1, sizeof (TchHeader), F) != sizeof (TchHeader)) {
415 Error ("Error writing to `%s' (disk full?)", Output);
418 /* Write the width table to the output file */
419 if (fwrite (WidthBuf, 1, 0x5F, F) != 0x5F) {
420 Error ("Error writing to `%s' (disk full?)", Output);
423 /* Write the offsets to the output file */
424 if (fwrite (SB_GetConstBuf (&Offsets), 1, 0x5F * 2, F) != 0x5F * 2) {
425 Error ("Error writing to `%s' (disk full?)", Output);
428 /* Write the data to the output file */
429 Offs = SB_GetLen (&VectorData);
430 if (fwrite (SB_GetConstBuf (&VectorData), 1, Offs, F) != Offs) {
431 Error ("Error writing to `%s' (disk full?)", Output);
434 /* Close the output file */
435 if (fclose (F) != 0) {
436 Error ("Error closing to `%s': %s", Output, strerror (errno));
444 int main (int argc, char* argv [])
445 /* Assembler main program */
447 /* Program long options */
448 static const LongOpt OptTab[] = {
449 { "--help", 0, OptHelp },
450 { "--verbose", 0, OptVerbose },
451 { "--version", 0, OptVersion },
456 /* Initialize the cmdline module */
457 InitCmdLine (&argc, &argv, "chrcvt");
459 /* Check the parameters */
461 while (I < ArgCount) {
463 /* Get the argument */
464 const char* Arg = ArgVec[I];
466 /* Check for an option */
467 if (Arg [0] == '-') {
471 LongOption (&I, OptTab, sizeof(OptTab)/sizeof(OptTab[0]));
492 /* Filename. Dump it. */
493 ConvertFile (Arg, 0);
501 /* Print a message if we did not process any files */
502 if (FilesProcessed == 0) {
503 fprintf (stderr, "%s: No input files\n", ProgName);