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https://github.com/cc65/cc65.git
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138 lines
5.0 KiB
C
138 lines
5.0 KiB
C
/*****************************************************************************/
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/* */
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/* tgi_load_vectorfont.c */
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/* */
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/* Loader module for TGI vector font files */
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/* */
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/* */
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/* */
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/* (C) 2009, Ullrich von Bassewitz */
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/* Roemerstrasse 52 */
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/* D-70794 Filderstadt */
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/* EMail: uz@cc65.org */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <tgi.h>
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#include <tgi/tgi-kernel.h>
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#include <tgi/tgi-vectorfont.h>
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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const tgi_vectorfont* __fastcall__ tgi_load_vectorfont (const char* name)
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/* Load a vector font into memory and return it. In case of errors, NULL is
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* returned and an error is set, which can be retrieved using tgi_geterror.
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* To use the font, it has to be installed using tgi_install_vectorfont.
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*/
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{
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static const char Magic[4] = {
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0x54, 0x43, 0x48, TGI_VF_VERSION
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};
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tgi_vectorfont_header H;
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int F;
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tgi_vectorfont* Font = 0;
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unsigned V;
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unsigned char I;
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/* Assume we have an error loading the font */
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tgi_error = TGI_ERR_CANNOT_LOAD;
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/* Open the file */
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F = open (name, O_RDONLY);
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if (F < 0) {
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/* Cannot open file */
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goto LoadError;
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}
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/* Read the header */
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if (read (F, &H, sizeof (H)) != sizeof (H)) {
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/* Cannot read header bytes */
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goto LoadError;
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}
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/* Check the header */
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if (memcmp (&H, Magic, sizeof (Magic)) != 0) {
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/* Header magic not ok */
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goto LoadError;
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}
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/* Allocate memory for the data */
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Font = malloc (H.size);
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if (Font == 0) {
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/* Out of memory */
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tgi_error = TGI_ERR_NO_RES;
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goto LoadError;
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}
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/* Read the whole font file into the buffer */
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if (read (F, Font, H.size) != H.size) {
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/* Problem reading font data */
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free (Font);
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goto LoadError;
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}
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/* Close the file */
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close (F);
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/* Fix the offset pointers. When loaded, they contain numeric offsets
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* into the VectorOps, with the start of the VectorOps at offset zero.
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* We will add a pointer to the VectorOps to make them actual pointers
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* that may be used independently from anything else.
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*/
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V = (unsigned) &Font->vec_ops;
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for (I = 0; I < TGI_VF_CCOUNT; ++I) {
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Font->chars[I] += V;
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}
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/* Clear the error */
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tgi_error = TGI_ERR_OK;
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/* Return the vector font loaded */
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return Font;
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LoadError:
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/* Some sort of load problem. If the file is still open, be sure to
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* close it
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*/
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if (F >= 0) {
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close (F);
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}
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return 0;
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}
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