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File reading, verification and comments.

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git-svn-id: svn://svn.cc65.org/cc65/trunk@4408 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz 2009-10-30 22:34:08 +00:00
parent 6da8c5639c
commit b86682d29d
1 changed files with 171 additions and 16 deletions
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187
src/chrcvt/main.c
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@ -40,6 +40,8 @@
/* common */
#include "cmdline.h"
#include "print.h"
#include "xmalloc.h"
#include "version.h"
/* chrcvt */
@ -47,8 +49,114 @@
/*
* The following is a corrected doc from the BGI font editor toolkit:
*
* BGI Stroke File Format
*
* The structure of Borland .CHR (stroke) files is as follows:
*
* ; offset 0h is a Borland header:
* ;
* HeaderSize equ 080h
* DataSize equ (size of font file)
* descr equ "Triplex font"
* fname equ "TRIP"
* MajorVersion equ 1
* MinorVersion equ 0
*
* db 'PK',8,8
* db 'BGI ',descr,' V'
* db MajorVersion+'0'
* db (MinorVersion / 10)+'0',(MinorVersion mod 10)+'0'
* db ' - 19 October 1987',0DH,0AH
* db 'Copyright (c) 1987 Borland International', 0dh,0ah
* db 0,1ah ; null & ctrl-Z = end
*
* dw HeaderSize ; size of header
* db fname ; font name
* dw DataSize ; font file size
* db MajorVersion,MinorVersion ; version #'s
* db 1,0 ; minimal version #'s
*
* db (HeaderSize - $) DUP (0) ; pad out to header size
*
* At offset 80h starts data for the file:
*
* ; 80h '+' flags stroke file type
* ; 81h-82h number chars in font file (n)
* ; 83h undefined
* ; 84h ASCII value of first char in file
* ; 85h-86h offset to stroke definitions (8+3n)
* ; 87h scan flag (normally 0)
* ; 88h distance from origin to top of capital
* ; 89h distance from origin to baseline
* ; 8Ah distance from origin to bottom descender
* ; 8Bh-8Fh undefined
* ; 90h offsets to individual character definitions
* ; 90h+2n width table (one word per character)
* ; 90h+3n start of character definitions
* ;
* The individual character definitions consist of a variable number of words
* describing the operations required to render a character. Each word
* consists of an (x,y) coordinate pair and a two-bit opcode, encoded as shown
* here:
*
* Byte 1 7 6 5 4 3 2 1 0 bit #
* op1 <seven bit signed X coord>
*
* Byte 2 7 6 5 4 3 2 1 0 bit #
* op2 <seven bit signed Y coord>
*
*
* Opcodes
*
* op1=0 op2=0 End of character definition.
* op1=1 op2=0 Move the pointer to (x,y)
* op1=1 op2=1 Draw from current pointer to (x,y)
*/
/* The target file format is designed to be read by a cc65 compiled program
* more easily. It should not be necessary to load the whole file into a
* buffer to parse it, or seek within the file. Also using less memory if
* possible would be fine. Therefore we use the following structure:
*
* Header portion:
* .byte $54, $43, $48, $00 ; "TCH" version
* .word <size of following data>
* 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
* Character definitions:
* .byte <width>
* .word <converted opcode>, ...
* .byte $80
*
* The opcodes get converted for easier handling: END is marked by bit 7
* 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.
*
* 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.
*/
/*****************************************************************************/
/* Data */
/* Data */
/*****************************************************************************/
@ -58,7 +166,7 @@ static unsigned FilesProcessed = 0;
/*****************************************************************************/
/* Code */
/* Code */
/*****************************************************************************/
@ -70,21 +178,9 @@ static void Usage (void)
"Usage: %s [options] file [options] [file]\n"
"Short options:\n"
" -h\t\t\tHelp (this text)\n"
" -H\t\t\tDump the object file header\n"
" -S\t\t\tDump segments sizes\n"
" -V\t\t\tPrint the version number and exit\n"
"\n"
"Long options:\n"
" --dump-all\t\tDump all object file information\n"
" --dump-dbgsyms\tDump debug symbols\n"
" --dump-exports\tDump exported symbols\n"
" --dump-files\t\tDump the source files\n"
" --dump-header\t\tDump the object file header\n"
" --dump-imports\tDump imported symbols\n"
" --dump-lineinfo\tDump line information\n"
" --dump-options\tDump object file options\n"
" --dump-segments\tDump the segments in the file\n"
" --dump-segsize\tDump segments sizes\n"
" --help\t\tHelp (this text)\n"
" --version\t\tPrint the version number and exit\n",
ProgName);
@ -102,6 +198,15 @@ static void OptHelp (const char* Opt attribute ((unused)),
static void OptVerbose (const char* Opt attribute ((unused)),
const char* Arg attribute ((unused)))
/* Increase verbosity */
{
++Verbosity;
}
static void OptVersion (const char* Opt attribute ((unused)),
const char* Arg attribute ((unused)))
/* Print the assembler version */
@ -116,14 +221,63 @@ static void OptVersion (const char* Opt attribute ((unused)),
static void ConvertFile (const char* Name)
/* Convert one vector font file */
{
/* Try to open the file */
static const unsigned char ChrHeader[] = {
0x50, 0x4B, 0x08, 0x08, 0x42, 0x47, 0x49, 0x20
};
long Size;
unsigned char* Buf;
unsigned char* MsgEnd;
/* Try to open the file for reading */
FILE* F = fopen (Name, "rb");
if (F == 0) {
Error ("Cannot open `%s': %s", Name, strerror (errno));
Error ("Cannot open `%s': %s", Name, strerror (errno));
}
/* Seek to the end and determine the size */
fseek (F, 0, SEEK_END);
Size = ftell (F);
/* Seek back to the start of the file */
fseek (F, 0, SEEK_SET);
/* Check if the size is reasonable */
if (Size > 32*1024) {
Error ("File `%s' is too large (max = 32k)", Name);
} else if (Size < 0x100) {
Error ("File `%s' is too small to be a vector font file", Name);
}
/* Allocate memory for the file */
Buf = xmalloc ((size_t) Size);
/* Read the file contents into the buffer */
if (fread (Buf, 1, (size_t) Size, F) != (size_t) Size) {
Error ("Error reading from `%s'", Name);
}
/* Close the file */
fclose (F);
/* Verify the header */
if (memcmp (Buf, ChrHeader, sizeof (ChrHeader)) != 0) {
Error ("Invalid format for `%s': invalid header", Name);
}
MsgEnd = memchr (Buf + sizeof (ChrHeader), 0x1A, 0x80);
if (MsgEnd == 0) {
Error ("Invalid format for `%s': description not found", Name);
}
if (MsgEnd[1] != 0x80 || MsgEnd[2] != 0x00) {
Error ("Invalid format for `%s': wrong header size", Name);
}
/* Print the copyright from the header */
Print (stderr, 1, "%.*s\n", (int) (MsgEnd - Buf - 4), Buf+4);
/* Convert the buffer into a strokefont structure */
}
@ -134,6 +288,7 @@ int main (int argc, char* argv [])
/* Program long options */
static const LongOpt OptTab[] = {
{ "--help", 0, OptHelp },
{ "--verbose", 0, OptVerbose },
{ "--version", 0, OptVersion },
};