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Wrote the actual conversion. Still untested.

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git-svn-id: svn://svn.cc65.org/cc65/trunk@4411 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz 2009-10-31 15:42:59 +00:00
parent b8b3dcce74
commit 784c709f97
1 changed files with 169 additions and 28 deletions
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189
src/chrcvt/main.c
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@ -41,6 +41,7 @@
/* common */
#include "cmdline.h"
#include "print.h"
#include "strbuf.h"
#include "xmalloc.h"
#include "version.h"
@ -125,16 +126,14 @@
*
* Header portion:
* .byte $54, $43, $48, $00 ; "TCH" version
* .word <size of following data>
* .word <size of char definitions>
* Data portion:
* .byte <number of chars in font> ; Value from $81
* .byte <ascii value of first char> ; Value from $84
* .byte <top> ; Value from $88
* .byte <baseline> ; Value from $89
* .byte <bottom> ; Negative value from $8A
* .word <char definition offsets>, ... ; Relative to data portion
* .byte <width>, ... ; $5F width bytes
* .word <char definition offset>, ... ; $5F char def offsets
* Character definitions:
* .byte <width>
* .word <converted opcode>, ...
* .byte $80
*
@ -142,15 +141,16 @@
* set in the first byte. The second byte of this opcode is not needed.
* Bit 7 of the second byte marks a MOVE (bit 7 = 0) or DRAW (bit 7 = 1).
*
* The parsing code does not expect the file to contain more than $7D
* characters (most will contain $5E or similar), therefore the character
* definition offset will be accessed using the pointer to the data portion
* plus an offset in an 8 bit index register.
* The number of characters is fixed to $20..$7E (space to tilde), so character
* widths and offsets can be stored in fixed size preallocated tables. The
* space for the character definitions is allocated on the heap, it's size
* is stored in the header.
*
* Above structure allows a program to read the header portion of the file,
* validate it, allocate memory for the data portion and read the data portion
* in one chunk into memory. The character definition offsets will then be
* converted into pointers by adding the data portion pointer to each.
* validate it, read the width and offset tables into static storage, allocate
* memory for the character definitions read them into memory in one chunk.
* The character definition offsets will then be converted into pointers by
* adding the character definition base pointer to each.
*/
@ -218,21 +218,88 @@ static void OptVersion (const char* Opt attribute ((unused)),
static void ConvertFile (const char* Name)
static void ConvertChar (StrBuf* Data, const unsigned char* Buf)
/* Convert data for one character. Original data is in Buf, converted data
* will be placed in Data.
*/
{
/* We should check here for reading past the end of the buffer in case the
* input data is not sane.
*/
while (1) {
/* Get the next op word */
unsigned Op = (Buf[0] + (Buf[1] << 8)) & 0x8080;
/* Check the opcode */
switch (Op) {
case 0x0000:
/* End */
SB_AppendChar (Data, 0x80);
return;
case 0x0080:
/* Move */
SB_AppendChar (Data, Buf[0] & 0x7F);
SB_AppendChar (Data, Buf[1] & 0x7F);
break;
case 0x8000:
/* Invalid opcode */
Error ("Input file contains invalid opcode 0x8000");
break;
case 0x8080:
/* Draw */
SB_AppendChar (Data, Buf[0] & 0x7F);
SB_AppendChar (Data, Buf[1] | 0x80);
break;
}
/* Next Op */
Buf += 2;
}
}
static void ConvertFile (const char* Input, const char* Output)
/* Convert one vector font file */
{
/* The header of a BGI vector font file */
static const unsigned char ChrHeader[] = {
0x50, 0x4B, 0x08, 0x08, 0x42, 0x47, 0x49, 0x20
};
/* The header of a TGI vector font file */
unsigned char TchHeader[] = {
0x54, 0x43, 0x48, 0x00, /* "TCH" version */
0x00, 0x00, /* size of char definitions */
0x00, /* Top */
0x00, /* Baseline */
0x00, /* Bottom */
};
long Size;
unsigned char* Buf;
unsigned char* MsgEnd;
unsigned FirstChar;
unsigned CharCount;
unsigned LastChar;
unsigned Char;
unsigned Offs;
const unsigned char* OffsetBuf;
const unsigned char* WidthBuf;
const unsigned char* VectorBuf;
StrBuf Offsets = AUTO_STRBUF_INITIALIZER;
StrBuf VectorData = AUTO_STRBUF_INITIALIZER;
/* Try to open the file for reading */
FILE* F = fopen (Name, "rb");
FILE* F = fopen (Input, "rb");
if (F == 0) {
Error ("Cannot open `%s': %s", Name, strerror (errno));
Error ("Cannot open input file `%s': %s", Input, strerror (errno));
}
/* Seek to the end and determine the size */
@ -244,9 +311,9 @@ static void ConvertFile (const char* Name)
/* Check if the size is reasonable */
if (Size > 32*1024) {
Error ("File `%s' is too large (max = 32k)", Name);
Error ("Input file `%s' is too large (max = 32k)", Input);
} else if (Size < 0x100) {
Error ("File `%s' is too small to be a vector font file", Name);
Error ("Input file `%s' is too small to be a vector font file", Input);
}
/* Allocate memory for the file */
@ -254,30 +321,104 @@ static void ConvertFile (const char* Name)
/* Read the file contents into the buffer */
if (fread (Buf, 1, (size_t) Size, F) != (size_t) Size) {
Error ("Error reading from `%s'", Name);
Error ("Error reading from input file `%s'", Input);
}
/* Close the file */
fclose (F);
(void) fclose (F);
/* Verify the header */
if (memcmp (Buf, ChrHeader, sizeof (ChrHeader)) != 0) {
Error ("Invalid format for `%s': invalid header", Name);
Error ("Invalid format for `%s': invalid header", Input);
}
MsgEnd = memchr (Buf + sizeof (ChrHeader), 0x1A, 0x80);
if (MsgEnd == 0) {
Error ("Invalid format for `%s': description not found", Name);
Error ("Invalid format for `%s': description not found", Input);
}
if (MsgEnd[1] != 0x80 || MsgEnd[2] != 0x00) {
Error ("Invalid format for `%s': wrong header size", Name);
Error ("Invalid format for `%s': wrong header size", Input);
}
/* We expect the file to hold chars from 0x20 (space) to 0x7E (tilde) */
FirstChar = Buf[0x84];
CharCount = Buf[0x81] + (Buf[0x82] << 8);
LastChar = FirstChar + CharCount - 1;
if (FirstChar < 0x20 || LastChar < 0x7E) {
Error ("File `%s' doesn't contain the chars we need", Input);
} else if (LastChar >= 0x100) {
Error ("File `%s' contains too many character definitions", Input);
}
/* Print the copyright from the header */
Print (stderr, 1, "%.*s\n", (int) (MsgEnd - Buf - 4), Buf+4);
/* Convert the buffer into a strokefont structure */
/* Get pointers to the width table, the offset table and the vector data
* table. The first two corrected for 0x20 as first entry.
*/
OffsetBuf = Buf + 0x90 + ((0x20 - FirstChar) * 2);
WidthBuf = Buf + 0x90 + (CharCount * 2) + (0x20 - FirstChar);
VectorBuf = Buf + 0x90 + (CharCount * 3);
/* Convert the characters */
for (Char = 0x20; Char <= 0x7E; ++Char, OffsetBuf += 2) {
/* Add the offset to the offset table */
Offs = SB_GetLen (&VectorData);
SB_AppendChar (&Offsets, Offs & 0xFF);
SB_AppendChar (&Offsets, (Offs >> 8) & 0xFF);
/* Get the offset of the vector data in the BGI data buffer */
Offs = OffsetBuf[0] + (OffsetBuf[1] << 8);
/* Check if the offset is valid */
if (Offs + (VectorBuf - Buf) > Size) {
Error ("Invalid data offset in input file `%s'", Input);
}
/* Convert the vector data and place it into the buffer */
ConvertChar (&VectorData, VectorBuf + Offs);
}
/* Complete the TCH header */
Offs = SB_GetLen (&VectorData);
TchHeader[4] = Offs & 0xFF;
TchHeader[5] = (Offs >> 8) & 0xFF;
TchHeader[6] = Buf[0x88];
TchHeader[7] = Buf[0x89];
TchHeader[8] = (unsigned char) -(signed char)(Buf[0x8A]);
/* Open the output file */
F = fopen (Output, "wb");
if (F == 0) {
Error ("Cannot open output file `%s': %s", Output, strerror (errno));
}
/* Write the header to the output file */
if (fwrite (TchHeader, 1, sizeof (TchHeader), F) != sizeof (TchHeader)) {
Error ("Error writing to `%s' (disk full?)", Output);
}
/* Write the width table to the output file */
if (fwrite (WidthBuf, 1, 0x5F, F) != 0x5F) {
Error ("Error writing to `%s' (disk full?)", Output);
}
/* Write the offsets to the output file */
if (fwrite (SB_GetConstBuf (&Offsets), 1, 0x5F * 2, F) != 0x5F * 2) {
Error ("Error writing to `%s' (disk full?)", Output);
}
/* Write the data to the output file */
if (fwrite (SB_GetConstBuf (&VectorData), 1, Offs, F) != Offs) {
Error ("Error writing to `%s' (disk full?)", Output);
}
/* Close the output file */
if (fclose (F) != 0) {
Error ("Error closing to `%s': %s", Output, strerror (errno));
}
/* Done */
}
@ -327,7 +468,7 @@ int main (int argc, char* argv [])
}
} else {
/* Filename. Dump it. */
ConvertFile (Arg);
ConvertFile (Arg, "out.tch");
++FilesProcessed;
}