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-rw-r--r--src/strife/deh_io.c211
1 files changed, 211 insertions, 0 deletions
diff --git a/src/strife/deh_io.c b/src/strife/deh_io.c
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+++ b/src/strife/deh_io.c
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+// Emacs style mode select -*- C++ -*-
+//-----------------------------------------------------------------------------
+//
+// Copyright(C) 2005 Simon Howard
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License
+// as published by the Free Software Foundation; either version 2
+// of the License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+// 02111-1307, USA.
+//
+//-----------------------------------------------------------------------------
+//
+// Dehacked I/O code (does all reads from dehacked files)
+//
+//-----------------------------------------------------------------------------
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "i_system.h"
+#include "z_zone.h"
+
+#include "deh_defs.h"
+#include "deh_io.h"
+
+struct deh_context_s
+{
+ FILE *stream;
+ char *filename;
+ int linenum;
+ boolean last_was_newline;
+ char *readbuffer;
+ int readbuffer_size;
+};
+
+// Open a dehacked file for reading
+// Returns NULL if open failed
+
+deh_context_t *DEH_OpenFile(char *filename)
+{
+ FILE *fstream;
+ deh_context_t *context;
+
+ fstream = fopen(filename, "r");
+
+ if (fstream == NULL)
+ return NULL;
+
+ context = Z_Malloc(sizeof(*context), PU_STATIC, NULL);
+ context->stream = fstream;
+
+ // Initial read buffer size of 128 bytes
+
+ context->readbuffer_size = 128;
+ context->readbuffer = Z_Malloc(context->readbuffer_size, PU_STATIC, NULL);
+ context->filename = filename;
+ context->linenum = 0;
+ context->last_was_newline = true;
+
+ return context;
+}
+
+// Close dehacked file
+
+void DEH_CloseFile(deh_context_t *context)
+{
+ fclose(context->stream);
+ Z_Free(context->readbuffer);
+ Z_Free(context);
+}
+
+// Reads a single character from a dehacked file
+
+int DEH_GetChar(deh_context_t *context)
+{
+ int result;
+
+ // Read characters, but ignore carriage returns
+ // Essentially this is a DOS->Unix conversion
+
+ do
+ {
+ if (feof(context->stream))
+ {
+ // end of file
+
+ result = -1;
+ }
+ else
+ {
+ result = fgetc(context->stream);
+ }
+
+ } while (result == '\r');
+
+ // Track the current line number
+
+ if (context->last_was_newline)
+ {
+ ++context->linenum;
+ }
+
+ context->last_was_newline = result == '\n';
+
+ return result;
+}
+
+// Increase the read buffer size
+
+static void IncreaseReadBuffer(deh_context_t *context)
+{
+ char *newbuffer;
+ int newbuffer_size;
+
+ newbuffer_size = context->readbuffer_size * 2;
+ newbuffer = Z_Malloc(newbuffer_size, PU_STATIC, NULL);
+
+ memcpy(newbuffer, context->readbuffer, context->readbuffer_size);
+
+ Z_Free(context->readbuffer);
+
+ context->readbuffer = newbuffer;
+ context->readbuffer_size = newbuffer_size;
+}
+
+// Read a whole line
+
+char *DEH_ReadLine(deh_context_t *context)
+{
+ int c;
+ int pos;
+
+ for (pos = 0;;)
+ {
+ c = DEH_GetChar(context);
+
+ if (c < 0)
+ {
+ // end of file
+
+ return NULL;
+ }
+
+ // cope with lines of any length: increase the buffer size
+
+ if (pos >= context->readbuffer_size)
+ {
+ IncreaseReadBuffer(context);
+ }
+
+ if (c == '\n')
+ {
+ // end of line: a full line has been read
+
+ context->readbuffer[pos] = '\0';
+ break;
+ }
+ else if (c != '\0')
+ {
+ // normal character; don't allow NUL characters to be
+ // added.
+
+ context->readbuffer[pos] = (char) c;
+ ++pos;
+ }
+ }
+
+ return context->readbuffer;
+}
+
+void DEH_Warning(deh_context_t *context, char *msg, ...)
+{
+ va_list args;
+
+ va_start(args, msg);
+
+ fprintf(stderr, "%s:%i: warning: ", context->filename, context->linenum);
+ vfprintf(stderr, msg, args);
+ fprintf(stderr, "\n");
+
+ va_end(args);
+}
+
+void DEH_Error(deh_context_t *context, char *msg, ...)
+{
+ va_list args;
+
+ va_start(args, msg);
+
+ fprintf(stderr, "%s:%i: ", context->filename, context->linenum);
+ vfprintf(stderr, msg, args);
+ fprintf(stderr, "\n");
+
+ va_end(args);
+
+ I_Error("Error parsing dehacked file");
+}
+
+