ref: 6a87a917afb090dab585bce8b2aba5db1accdc6b
dir: /src/deh_main.c/
//
// Copyright(C) 2005-2014 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.
//
//
// Main dehacked code
//
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "doomtype.h"
#include "i_system.h"
#include "d_iwad.h"
#include "m_argv.h"
#include "w_wad.h"
#include "deh_defs.h"
#include "deh_io.h"
extern deh_section_t *deh_section_types[];
extern char *deh_signatures[];
static boolean deh_initialized = false;
// If true, we can parse [STRINGS] sections in BEX format.
boolean deh_allow_extended_strings = false;
// If true, we can do long string replacements.
boolean deh_allow_long_strings = false;
// If true, we can do cheat replacements longer than the originals.
boolean deh_allow_long_cheats = false;
// If false, dehacked cheat replacements are ignored.
boolean deh_apply_cheats = true;
void DEH_Checksum(sha1_digest_t digest)
{
sha1_context_t sha1_context;
unsigned int i;
SHA1_Init(&sha1_context);
for (i=0; deh_section_types[i] != NULL; ++i)
{
if (deh_section_types[i]->sha1_hash != NULL)
{
deh_section_types[i]->sha1_hash(&sha1_context);
}
}
SHA1_Final(digest, &sha1_context);
}
// Called on startup to call the Init functions
static void InitializeSections(void)
{
unsigned int i;
for (i=0; deh_section_types[i] != NULL; ++i)
{
if (deh_section_types[i]->init != NULL)
{
deh_section_types[i]->init();
}
}
}
static void DEH_Init(void)
{
//!
// @category mod
//
// Ignore cheats in dehacked files.
//
if (M_CheckParm("-nocheats") > 0)
{
deh_apply_cheats = false;
}
// Call init functions for all the section definitions.
InitializeSections();
deh_initialized = true;
}
// Given a section name, get the section structure which corresponds
static deh_section_t *GetSectionByName(char *name)
{
unsigned int i;
// we explicitely do not recognize [STRINGS] sections at all
// if extended strings are not allowed
if (!deh_allow_extended_strings && !strncasecmp("[STRINGS]", name, 9))
{
return NULL;
}
for (i=0; deh_section_types[i] != NULL; ++i)
{
if (!strcasecmp(deh_section_types[i]->name, name))
{
return deh_section_types[i];
}
}
return NULL;
}
// Is the string passed just whitespace?
static boolean IsWhitespace(char *s)
{
for (; *s; ++s)
{
if (!isspace(*s))
return false;
}
return true;
}
// Strip whitespace from the start and end of a string
static char *CleanString(char *s)
{
char *strending;
// Leading whitespace
while (*s && isspace(*s))
++s;
// Trailing whitespace
strending = s + strlen(s) - 1;
while (strlen(s) > 0 && isspace(*strending))
{
*strending = '\0';
--strending;
}
return s;
}
// This pattern is used a lot of times in different sections,
// an assignment is essentially just a statement of the form:
//
// Variable Name = Value
//
// The variable name can include spaces or any other characters.
// The string is split on the '=', essentially.
//
// Returns true if read correctly
boolean DEH_ParseAssignment(char *line, char **variable_name, char **value)
{
char *p;
// find the equals
p = strchr(line, '=');
if (p == NULL)
{
return false;
}
// variable name at the start
// turn the '=' into a \0 to terminate the string here
*p = '\0';
*variable_name = CleanString(line);
// value immediately follows the '='
*value = CleanString(p+1);
return true;
}
static boolean CheckSignatures(deh_context_t *context)
{
size_t i;
char *line;
// Read the first line
line = DEH_ReadLine(context, false);
if (line == NULL)
{
return false;
}
// Check all signatures to see if one matches
for (i=0; deh_signatures[i] != NULL; ++i)
{
if (!strcmp(deh_signatures[i], line))
{
return true;
}
}
return false;
}
// Parses a comment string in a dehacked file.
static void DEH_ParseComment(char *comment)
{
//
// Welcome, to the super-secret Chocolate Doom-specific Dehacked
// overrides function.
//
// Putting these magic comments into your Dehacked lumps will
// allow you to go beyond the normal limits of Vanilla Dehacked.
// Because of this, these comments are deliberately undocumented,
// and if you're using them you should be aware that your mod
// is not compatible with Vanilla Doom and you're probably a
// very naughty person.
//
// Allow comments containing this special value to allow string
// replacements longer than those permitted by DOS dehacked.
// This allows us to use a dehacked patch for doing string
// replacements for emulating Chex Quest.
//
// If you use this, your dehacked patch may not work in Vanilla
// Doom.
if (strstr(comment, "*allow-long-strings*") != NULL)
{
deh_allow_long_strings = true;
}
// Allow magic comments to allow longer cheat replacements than
// those permitted by DOS dehacked. This is also for Chex
// Quest.
if (strstr(comment, "*allow-long-cheats*") != NULL)
{
deh_allow_long_cheats = true;
}
// Allow magic comments to allow parsing [STRINGS] section
// that are usually only found in BEX format files. This allows
// for substitution of map and episode names when loading
// Freedoom/FreeDM IWADs.
if (strstr(comment, "*allow-extended-strings*") != NULL)
{
deh_allow_extended_strings = true;
}
}
// Parses a dehacked file by reading from the context
static void DEH_ParseContext(deh_context_t *context)
{
deh_section_t *current_section = NULL;
char section_name[20];
void *tag = NULL;
boolean extended;
char *line;
// Read the header and check it matches the signature
if (!CheckSignatures(context))
{
DEH_Error(context, "This is not a valid dehacked patch file!");
}
// Read the file
while (!DEH_HadError(context))
{
// Read the next line. We only allow the special extended parsing
// for the BEX [STRINGS] section.
extended = current_section != NULL
&& !strcasecmp(current_section->name, "[STRINGS]");
line = DEH_ReadLine(context, extended);
// end of file?
if (line == NULL)
{
return;
}
while (line[0] != '\0' && isspace(line[0]))
++line;
if (line[0] == '#')
{
// comment
DEH_ParseComment(line);
continue;
}
if (IsWhitespace(line))
{
if (current_section != NULL)
{
// end of section
if (current_section->end != NULL)
{
current_section->end(context, tag);
}
//printf("end %s tag\n", current_section->name);
current_section = NULL;
}
}
else
{
if (current_section != NULL)
{
// parse this line
current_section->line_parser(context, line, tag);
}
else
{
// possibly the start of a new section
sscanf(line, "%19s", section_name);
current_section = GetSectionByName(section_name);
if (current_section != NULL)
{
tag = current_section->start(context, line);
//printf("started %s tag\n", section_name);
}
else
{
//printf("unknown section name %s\n", section_name);
}
}
}
}
}
// Parses a dehacked file
int DEH_LoadFile(const char *filename)
{
deh_context_t *context;
if (!deh_initialized)
{
DEH_Init();
}
// Before parsing a new file, reset special override flags to false.
// Magic comments should only apply to the file in which they were
// defined, and shouldn't carry over to subsequent files as well.
deh_allow_long_strings = false;
deh_allow_long_cheats = false;
deh_allow_extended_strings = false;
printf(" loading %s\n", filename);
context = DEH_OpenFile(filename);
if (context == NULL)
{
fprintf(stderr, "DEH_LoadFile: Unable to open %s\n", filename);
return 0;
}
DEH_ParseContext(context);
DEH_CloseFile(context);
if (DEH_HadError(context))
{
I_Error("Error parsing dehacked file");
}
return 1;
}
// Load dehacked file from WAD lump.
// If allow_long is set, allow long strings and cheats just for this lump.
int DEH_LoadLump(int lumpnum, boolean allow_long, boolean allow_error)
{
deh_context_t *context;
if (!deh_initialized)
{
DEH_Init();
}
// Reset all special flags to defaults.
deh_allow_long_strings = allow_long;
deh_allow_long_cheats = allow_long;
deh_allow_extended_strings = false;
context = DEH_OpenLump(lumpnum);
if (context == NULL)
{
fprintf(stderr, "DEH_LoadFile: Unable to open lump %i\n", lumpnum);
return 0;
}
DEH_ParseContext(context);
DEH_CloseFile(context);
// If there was an error while parsing, abort with an error, but allow
// errors to just be ignored if allow_error=true.
if (!allow_error && DEH_HadError(context))
{
I_Error("Error parsing dehacked lump");
}
return 1;
}
int DEH_LoadLumpByName(const char *name, boolean allow_long, boolean allow_error)
{
int lumpnum;
lumpnum = W_CheckNumForName(name);
if (lumpnum == -1)
{
fprintf(stderr, "DEH_LoadLumpByName: '%s' lump not found\n", name);
return 0;
}
return DEH_LoadLump(lumpnum, allow_long, allow_error);
}
// Check the command line for -deh argument, and others.
void DEH_ParseCommandLine(void)
{
char *filename;
int p;
//!
// @arg <files>
// @category mod
//
// Load the given dehacked patch(es)
//
p = M_CheckParm("-deh");
if (p > 0)
{
++p;
while (p < myargc && myargv[p][0] != '-')
{
filename = D_TryFindWADByName(myargv[p]);
DEH_LoadFile(filename);
free(filename);
++p;
}
}
}