+++ /dev/null
-/*\r
- *************************************************************************\r
- *\r
- * PCX_COMM.C - PCX_LIB Library Common Functions\r
- *\r
- * Version: 1.00B\r
- *\r
- * History: 91/02/14 - Created\r
- * 91/04/01 - Release 1.00A\r
- * 91/04/03 - fixed "segread" call.\r
- * 91/04/07 - Release 1.00B\r
- *\r
- * Compiler: Microsoft C V6.0\r
- *\r
- * Author: Ian Ashdown, P.Eng.\r
- * byHeart Software\r
- * 620 Ballantree Road\r
- * West Vancouver, B.C.\r
- * Canada V7S 1W3\r
- * Tel. (604) 922-6148\r
- * Fax. (604) 987-7621\r
- *\r
- * Copyright: Public Domain\r
- *\r
- *************************************************************************\r
- */\r
-\f\r
-/*\r
- *************************************************************************\r
- *\r
- * PORTABILITY NOTES\r
- *\r
- * 1. While this program is written in ANSI C, it uses a number of \r
- * function calls that are specific to the Microsoft C V6.0 library.\r
- * These are documented as follows for the purposes of porting this\r
- * program to other compilers and/or processors: \r
- *\r
- * int86x - execute 80x86 interrupt routine (far data)\r
- * segread - get current 80x86 segment register values\r
- *\r
- *************************************************************************\r
- */\r
-\f\r
-/* INCLUDE FILES */\r
-\r
-#include <stdio.h>\r
-#include <stdlib.h>\r
-#include <dos.h>\r
-#include "pcx_int.h"\r
-\f\r
-/* FORWARD REFERENCES */\r
-\f\r
-/* GLOBALS */\r
-\f\r
-/* PUBLIC FUNCTIONS */\r
-\r
-/*\r
- *************************************************************************\r
- *\r
- * PCX_OPEN - Open PCX Workblock\r
- *\r
- * Purpose: To allocate and initialize a PCX image file workblock.\r
- *\r
- * Setup: PCX_WORKBLK *pcx_open\r
- * (\r
- * char *fname,\r
- * BOOL wrt_flag\r
- * )\r
- *\r
- * Where: fname is a PCX image file name.\r
- * wrt_flag is a Boolean flag which if TRUE indicates that\r
- * the PCX image file is to be opened for writing;\r
- * otherwise it is opened for reading.\r
- *\r
- * Return: A pointer to a PCX image file workblock if successful;\r
- * otherwise NULL.\r
- *\r
- *************************************************************************\r
- */\r
-\r
-PCX_WORKBLK *pcx_open\r
-(\r
- char *fname,\r
- BOOL wrt_flag\r
-)\r
-{\r
- PCX_WORKBLK *wbp; /* PCX image file workblock pointer */\r
-\r
- /* Allocate a workblock */\r
-\r
- if ((wbp = (PCX_WORKBLK *) malloc(sizeof(PCX_WORKBLK))) == NULL)\r
- return (NULL);\r
-\r
- /* Open the PCX image file in binary mode */\r
-\r
- if (wrt_flag == FALSE)\r
- wbp->fp = fopen(fname, "rb"); /* Open for reading */\r
- else\r
- wbp->fp = fopen(fname, "wb"); /* Open for writing */\r
-\r
- if (wbp->fp == NULL) /* Check for successful file opening */\r
- {\r
- free(wbp); /* Free the workblock memory */\r
- return (NULL);\r
- }\r
-\r
- return (wbp); /* Return the workblock pointer */\r
-}\r
-\f\r
-/*\r
- *************************************************************************\r
- *\r
- * PCX_CLOSE - Close PCX Workblock\r
- *\r
- * Purpose: To close a PCX image file and release its workblock\r
- * memory.\r
- *\r
- * Setup: BOOL pcx_close\r
- * (\r
- * PCX_WORKBLK *wbp\r
- * )\r
- *\r
- * Where: wbp is a PCX image file workblock pointer.\r
- *\r
- * Return: TRUE if successful; otherwise FALSE.\r
- *\r
- *************************************************************************\r
- */\r
-\r
-BOOL pcx_close\r
-(\r
- PCX_WORKBLK *wbp\r
-)\r
-{\r
- free(wbp->palettep); /* Free the extended palette (if it exists) */\r
-\r
- free(wbp); /* Free the PCX image file workblock */\r
-\r
- if (fclose(wbp->fp) == EOF) /* Close the PCX image file */\r
- return (FALSE);\r
-\r
- return (TRUE);\r
-}\r
-\f\r
-/*\r
- *************************************************************************\r
- *\r
- * PCX_ISVGA - Check For VGA Display Adapter\r
- *\r
- * Purpose: To determine whether a display adapter supports VGA BIOS\r
- * service routines.\r
- *\r
- * Setup: BOOL pcx_isvga(void)\r
- *\r
- * Return: TRUE if display adapter is VGA-compatible; otherwise\r
- * FALSE.\r
- *\r
- *************************************************************************\r
- */\r
-\r
-BOOL pcx_isvga(void)\r
-{\r
- unsigned char *vinfop; /* VGA information buffer pointer */\r
- union REGS regs; /* 80x86 register values */\r
- struct SREGS sregs; /* 80x86 segment register values */\r
-\r
- /* Allocate a VGA functionality/state information buffer */\r
-\r
- if ((vinfop = (unsigned char *) malloc(sizeof(unsigned char) * 64)) ==\r
- NULL)\r
- return (FALSE);\r
-\r
- /* Attempt to read the VGA information */\r
-\r
- regs.h.ah = 0x1b; /* Select "Return VGA Info" BIOS routine */\r
- regs.x.bx = 0; /* Implementation type */\r
-\r
- /* Get the VGA information buffer offset value */\r
-\r
- regs.x.di = (unsigned int) vinfop;\r
-\r
- segread(&sregs); /* Get the current DS segment register value */\r
-\r
- sregs.es = sregs.ds;\r
-\r
- int86x(0x10, ®s, ®s, &sregs); /* Call BIOS video service */\r
-\r
- free(vinfop); /* Free the VGA information buffer */\r
-\r
- /* The value 0x1b is returned in register AL only if a VGA display */\r
- /* adapter is present */\r
-\r
- if (regs.h.al == 0x1b)\r
- return (TRUE);\r
- else\r
- return (FALSE);\r
-}\r
-\r
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