ref: d4f9e828f61f3c6d02f646f0646e9dbecbb76a49
dir: /src/deh_io.c/
// 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 "w_wad.h" #include "z_zone.h" #include "deh_defs.h" #include "deh_io.h" typedef enum { DEH_INPUT_FILE, DEH_INPUT_LUMP } deh_input_type_t; struct deh_context_s { deh_input_type_t type; char *filename; // If the input comes from a memory buffer, pointer to the memory // buffer. unsigned char *input_buffer; size_t input_buffer_len; unsigned int input_buffer_pos; int lumpnum; // If the input comes from a file, the file stream for reading // data. FILE *stream; // Current line number that we have reached: int linenum; // Used by DEH_ReadLine: boolean last_was_newline; char *readbuffer; int readbuffer_size; }; static deh_context_t *DEH_NewContext(void) { deh_context_t *context; context = Z_Malloc(sizeof(*context), PU_STATIC, NULL); // Initial read buffer size of 128 bytes context->readbuffer_size = 128; context->readbuffer = Z_Malloc(context->readbuffer_size, PU_STATIC, NULL); context->linenum = 0; context->last_was_newline = true; return context; } // 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 = DEH_NewContext(); context->type = DEH_INPUT_FILE; context->stream = fstream; context->filename = strdup(filename); return context; } // Open a WAD lump for reading. deh_context_t *DEH_OpenLump(int lumpnum) { deh_context_t *context; void *lump; lump = W_CacheLumpNum(lumpnum, PU_STATIC); context = DEH_NewContext(); context->type = DEH_INPUT_LUMP; context->lumpnum = lumpnum; context->input_buffer = lump; context->input_buffer_len = W_LumpLength(lumpnum); context->input_buffer_pos = 0; context->filename = malloc(9); strncpy(context->filename, lumpinfo[lumpnum].name, 8); context->filename[8] = '\0'; return context; } // Close dehacked file void DEH_CloseFile(deh_context_t *context) { if (context->type == DEH_INPUT_FILE) { fclose(context->stream); } else if (context->type == DEH_INPUT_LUMP) { W_ReleaseLumpNum(context->lumpnum); } Z_Free(context->readbuffer); Z_Free(context); } int DEH_GetCharFile(deh_context_t *context) { if (feof(context->stream)) { // end of file return -1; } return fgetc(context->stream); } int DEH_GetCharLump(deh_context_t *context) { int result; if (context->input_buffer_pos >= context->input_buffer_len) { return -1; } result = context->input_buffer[context->input_buffer_pos]; ++context->input_buffer_pos; return result; } // Reads a single character from a dehacked file int DEH_GetChar(deh_context_t *context) { int result = 0; // Read characters, but ignore carriage returns // Essentially this is a DOS->Unix conversion do { switch (context->type) { case DEH_INPUT_FILE: result = DEH_GetCharFile(context); break; case DEH_INPUT_LUMP: result = DEH_GetCharLump(context); break; } } 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"); }