1 /* Catacomb Apocalypse Source Code
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2 * Copyright (C) 1993-2014 Flat Rock Software
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; either version 2 of the License, or
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7 * (at your option) any later version.
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9 * This program is distributed in the hope that it will be useful,
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10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 * GNU General Public License for more details.
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14 * You should have received a copy of the GNU General Public License along
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15 * with this program; if not, write to the Free Software Foundation, Inc.,
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16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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22 =============================================================================
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24 Id Software Caching Manager
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25 ---------------------------
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27 Must be started BEFORE the memory manager, because it needs to get the headers
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28 loaded into the data segment
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30 =============================================================================
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33 #include "src/lib/16_ca.h"
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39 //#define THREEBYTEGRSTARTS
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40 //https://github.com/open-watcom/open-watcom-v2/issues/279#issuecomment-244587566 for _seg
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42 =============================================================================
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46 =============================================================================
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51 word bit0,bit1; // 0-255 is a character, > is a pointer to a node
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58 long headeroffsets[100];
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64 =============================================================================
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68 =============================================================================
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74 unsigned _seg *mapsegs[3];
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75 maptype _seg *mapheaderseg[NUMMAPS];
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76 byte _seg *audiosegs[NUMSNDCHUNKS];
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77 void _seg *grsegs[NUMCHUNKS];
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79 byte far grneeded[NUMCHUNKS];*/
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81 void (*drawcachebox) (char *title, unsigned numcache);
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82 void (*updatecachebox) (void);
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83 void (*finishcachebox) (void);
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86 =============================================================================
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90 =============================================================================
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93 /*extern long far CGAhead;
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94 extern long far EGAhead;
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95 extern byte CGAdict;
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96 extern byte EGAdict;
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97 extern byte far maphead;
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98 extern byte mapdict;
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99 extern byte far audiohead;
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100 extern byte audiodict;
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103 long _seg *grstarts; // array of offsets in egagraph, -1 for sparse
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104 long _seg *audiostarts; // array of offsets in audio / audiot
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106 #ifdef GRHEADERLINKED
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107 huffnode *grhuffman;
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109 huffnode grhuffman[255];
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112 #ifdef AUDIOHEADERLINKED
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113 huffnode *audiohuffman;
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115 huffnode audiohuffman[255];
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119 int grhandle; // handle to EGAGRAPH
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120 int maphandle; // handle to MAPTEMP / GAMEMAPS
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121 int audiohandle; // handle to AUDIOT / AUDIO
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123 long chunkcomplen,chunkexplen;
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125 SDMode oldsoundmode;
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129 void CAL_DialogDraw (char *title,unsigned numcache);
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130 void CAL_DialogUpdate (void);
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131 void CAL_DialogFinish (void);*/
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132 //void CAL_CarmackExpand (unsigned far *source, unsigned far *dest,unsigned length);
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135 #ifdef THREEBYTEGRSTARTS
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136 #define FILEPOSSIZE 3
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137 //#define GRFILEPOS(c) (*(long far *)(((byte far *)grstarts)+(c)*3)&0xffffff)
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138 long GRFILEPOS(int c, global_game_variables_t *gvar)
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145 value = *(long far *)(((byte far *)gvar->ca.grstarts)+offset);
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147 value &= 0x00ffffffl;
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149 if (value == 0xffffffl)
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155 #define FILEPOSSIZE 4
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156 #define GRFILEPOS(c) (gvar->ca.grstarts[c])
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160 =============================================================================
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164 =============================================================================
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168 ============================
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170 = CA_OpenDebug / CA_CloseDebug
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172 = Opens a binary file with the handle "debughandle"
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174 ============================
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176 void CA_OpenDebug(global_game_variables_t *gvar)
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178 #ifdef __BORLANDC__
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179 unlink("debug.16b");
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180 gvar->handle.debughandle = open("debug.16b", O_CREAT | O_WRONLY | O_TEXT);
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183 unlink("debug.16w");
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184 gvar->handle.debughandle = open("debug.16w", O_CREAT | O_WRONLY | O_TEXT);
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188 void CA_CloseDebug(global_game_variables_t *gvar)
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190 close(gvar->handle.debughandle);
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196 ============================
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198 = CAL_GetGrChunkLength
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200 = Gets the length of an explicit length chunk (not tiles)
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201 = The file pointer is positioned so the compressed data can be read in next.
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203 ============================
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206 void CAL_GetGrChunkLength (int chunk)
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208 lseek(grhandle,GRFILEPOS(chunk),SEEK_SET);
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209 read(grhandle,&chunkexplen,sizeof(chunkexplen));
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210 chunkcomplen = GRFILEPOS(chunk+1)-GRFILEPOS(chunk)-4;
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215 ==========================
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219 = Read from a file to a far pointer
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221 ==========================
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224 boolean CA_FarRead(int handle, byte far *dest, dword length, global_game_variables_t *gvar)
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229 if(gvar->pm.emm.EMSVer<0x40)
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230 if(length>0xfffflu)
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232 printf("File is a fat bakapee\n");
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233 //segm=(length%0xfffflu)-1;
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234 //fat=segm*0xfffflu;
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236 printf("CA_FarRead doesn't support 64K reads yet!\n");
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237 return 0;//TODO: EXPAND!!!
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245 mov cx,[WORD PTR length]
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246 mov dx,[WORD PTR dest]
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247 mov ds,[WORD PTR dest+2]
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248 mov ah,0x3f // READ w/handle
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255 #ifdef __BORLANDC__
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259 #ifdef __BORLANDC__
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262 cmp ax,[WORD PTR length]
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264 // errno = EINVFMT; // user manager knows this is bad read
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267 #ifdef __BORLANDC__
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271 #ifdef __BORLANDC__
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275 #ifdef __BORLANDC__
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287 ==========================
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291 = Write from a file to a far pointer
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293 ==========================
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296 boolean CA_FarWrite(int handle, byte far *source, dword length, global_game_variables_t *gvar)
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301 if(gvar->pm.emm.EMSVer<0x40)
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302 if(length>0xfffflu)
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304 printf("File is a fat bakapee\n");
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305 //segm=(length%0xfffflu)-1;
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306 //fat=segm*0xfffflu;
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308 printf("CA_FarWrite doesn't support 64K reads yet!\n");
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317 mov cx,[WORD PTR length]
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318 mov dx,[WORD PTR source]
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319 mov ds,[WORD PTR source+2]
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320 mov ah,0x40 // WRITE w/handle
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327 #ifdef __BORLANDC__
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331 #ifdef __BORLANDC__
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334 cmp ax,[WORD PTR length]
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336 // errno = ENOMEM; // user manager knows this is bad write
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339 #ifdef __BORLANDC__
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343 #ifdef __BORLANDC__
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347 #ifdef __BORLANDC__
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359 ==========================
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363 = Reads a file into an allready allocated buffer
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365 ==========================
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368 boolean CA_ReadFile(char *filename, memptr *ptr, global_game_variables_t *gvar)
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374 if((handle = open(filename,O_RDONLY | O_BINARY, S_IREAD)) == -1)
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377 size = filelength(handle);
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378 if(!CA_FarRead(handle,*ptr,size, gvar))
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389 ==========================
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393 = Writes a file from a memory buffer
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395 ==========================
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398 boolean CA_WriteFile (char *filename, void far *ptr, long length, global_game_variables_t *gvar)
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404 handle = open(filename,O_CREAT | O_BINARY | O_WRONLY,
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405 S_IREAD | S_IWRITE | S_IFREG);
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410 if (!CA_FarWrite (handle,ptr,length, gvar))
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422 ==========================
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426 = Allocate space for and load a file
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428 ==========================
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431 boolean CA_LoadFile(char *filename, memptr *ptr, global_game_variables_t *gvar)
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437 if((handle = open(filename,O_RDONLY | O_BINARY, S_IREAD)) == -1)
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440 size = filelength(handle);
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441 #ifdef __DEBUG_CA__
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443 printf("===============================================================================\n");
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444 printf(" CA_LoadFile\n");
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445 printf("===============================================================================\n");
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447 printf(" ptr=%Fp\n", ptr);
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448 printf(" *ptr=%Fp\n", *ptr);
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449 printf(" &ptr=%Fp\n", &ptr);
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452 MM_GetPtr(ptr,size, gvar);
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453 #ifdef __DEBUG_CA__
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456 printf("---------------------------------------\n");
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457 printf(" ptr=%Fp\n", ptr);
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458 printf(" *ptr=%Fp\n", *ptr);
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459 printf(" &ptr=%Fp\n", &ptr);
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460 printf("-------------------------------------------------------------------------------\n");
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463 if(!CA_FarRead(handle,*ptr,size, gvar))
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473 ============================================================================
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475 COMPRESSION routines, see JHUFF.C for more
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477 ============================================================================
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485 = CAL_OptimizeNodes
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487 = Goes through a huffman table and changes the 256-511 node numbers to the
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488 = actular address of the node. Must be called before CAL_HuffExpand
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493 void CAL_OptimizeNodes(huffnode *table)
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500 for (i=0;i<255;i++)
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502 if (node->bit0 >= 256)
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503 node->bit0 = (unsigned)(table+(node->bit0-256));
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504 if (node->bit1 >= 256)
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505 node->bit1 = (unsigned)(table+(node->bit1-256));
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513 ======================
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517 = Length is the length of the EXPANDED data
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519 ======================
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522 void CAL_HuffExpand (byte far *source, byte far *dest,
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523 long length,huffnode *hufftable)
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525 // unsigned bit,byte,node,code;
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526 unsigned sourceseg,sourceoff,destseg,destoff,endoff;
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528 // huffnode *nodeon;
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530 headptr = hufftable+254; // head node is allways node 254
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532 source++; // normalize
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537 sourceseg = FP_SEG(source);
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538 sourceoff = FP_OFF(source);
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539 destseg = FP_SEG(dest);
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540 destoff = FP_OFF(dest);
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541 endoff = destoff+length;
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546 // ss:bx node pointer
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549 if (length <0xfff0)
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552 //--------------------------
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553 // expand less than 64k of data
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554 //--------------------------
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557 mov bx,[word ptr headptr]
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565 mov ch,[si] // load first byte
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568 #ifdef __BORLANDC__
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572 #ifdef __BORLANDC__
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575 test ch,cl // bit set?
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577 mov dx,[ss:bx] // take bit0 path from node
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578 shl cl,1 // advance to next bit position
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581 #ifdef __BORLANDC__
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585 #ifdef __BORLANDC__
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588 mov dx,[ss:bx+2] // take bit1 path
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589 shl cl,1 // advance to next bit position
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591 #ifdef __BORLANDC__
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595 #ifdef __BORLANDC__
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598 mov ch,[si] // load next byte
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600 mov cl,1 // back to first bit
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601 #ifdef __BORLANDC__
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605 #ifdef __BORLANDC__
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608 or dh,dh // if dx<256 its a byte, else move node
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610 mov bx,dx // next node = (huffnode *)code
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612 #ifdef __BORLANDC__
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616 #ifdef __BORLANDC__
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620 inc di // write a decopmpressed byte out
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621 mov bx,[word ptr headptr] // back to the head node for next bit
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630 //--------------------------
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631 // expand more than 64k of data
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632 //--------------------------
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637 mov bx,[word ptr headptr]
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645 lodsb // load first byte
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646 #ifdef __BORLANDC__
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650 #ifdef __BORLANDC__
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653 test al,cl // bit set?
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655 mov dx,[ss:bx] // take bit0 path from node
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657 #ifdef __BORLANDC__
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661 #ifdef __BORLANDC__
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664 mov dx,[ss:bx+2] // take bit1 path
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665 #ifdef __BORLANDC__
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669 #ifdef __BORLANDC__
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672 shl cl,1 // advance to next bit position
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675 cmp si,0x10 // normalize ds:si
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681 #ifdef __BORLANDC__
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685 #ifdef __BORLANDC__
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688 mov cl,1 // back to first bit
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689 #ifdef __BORLANDC__
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693 #ifdef __BORLANDC__
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696 or dh,dh // if dx<256 its a byte, else move node
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698 mov bx,dx // next node = (huffnode *)code
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700 #ifdef __BORLANDC__
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704 #ifdef __BORLANDC__
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708 inc di // write a decopmpressed byte out
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709 mov bx,[word ptr headptr] // back to the head node for next bit
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711 cmp di,0x10 // normalize es:di
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717 #ifdef __BORLANDC__
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721 #ifdef __BORLANDC__
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724 sub [WORD PTR ss:length],1
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726 dec [WORD PTR ss:length+2]
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727 jns expand // when length = ffff ffff, done
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740 ======================
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742 = CAL_CarmackExpand
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744 = Length is the length of the EXPANDED data
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746 ======================
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749 #define NEARTAG 0xa7
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750 #define FARTAG 0xa8
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752 void CAL_CarmackExpand (unsigned far *source, unsigned far *dest, unsigned length)
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754 unsigned ch,chhigh,count,offset;
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755 unsigned far *copyptr, far *inptr, far *outptr;
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766 if (chhigh == NEARTAG)
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770 { // have to insert a word containing the tag byte
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771 ch |= *(/*(unsigned char far *)*/inptr)++;
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777 offset = *(/*(unsigned char far *)*/inptr)++;
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778 copyptr = outptr - offset;
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781 *outptr++ = *copyptr++;
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784 else if (chhigh == FARTAG)
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788 { // have to insert a word containing the tag byte
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789 ch |= *(/*(unsigned char far *)*/inptr)++;
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796 copyptr = dest + offset;
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799 *outptr++ = *copyptr++;
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812 ======================
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816 ======================
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819 long CA_RLEWCompress (unsigned far *source, long length, unsigned far *dest,
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823 unsigned value,count,i;
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824 unsigned far *start,far *end;
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828 end = source + (length+1)/2;
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837 while (*source == value && source<end)
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842 if (count>3 || value == rlewtag)
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845 // send a tag / count / value string
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854 // send word without compressing
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856 for (i=1;i<=count;i++)
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860 } while (source<end);
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862 complength = 2*(dest-start);
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868 ======================
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871 = length is EXPANDED length
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873 ======================
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876 void CA_RLEWexpand (unsigned far *source, unsigned far *dest,long length,
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879 // unsigned value,count,i;
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881 unsigned sourceseg,sourceoff,destseg,destoff,endseg,endoff;
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891 if (value != rlewtag)
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899 // compressed string
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903 for (i=1;i<=count;i++)
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906 } while (dest<end);
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909 end = dest + (length)/2;
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910 sourceseg = FP_SEG(source);
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911 sourceoff = FP_OFF(source);
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912 destseg = FP_SEG(dest);
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913 destoff = FP_OFF(dest);
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914 endseg = FP_SEG(end);
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915 endoff = FP_OFF(end);
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919 // ax = source value
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921 // cx = repeat counts
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924 // NOTE: A repeat count that produces 0xfff0 bytes can blow this!
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932 #ifdef __BORLANDC__
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936 #ifdef __BORLANDC__
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944 #ifdef __BORLANDC__
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948 #ifdef __BORLANDC__
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952 mov cx,ax // repeat count
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953 lodsw // repeat value
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955 #ifdef __BORLANDC__
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959 #ifdef __BORLANDC__
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962 cmp si,0x10 // normalize ds:si
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973 #ifdef __BORLANDC__
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977 #ifdef __BORLANDC__
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980 cmp di,0x10 // normalize es:di
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991 #ifdef __BORLANDC__
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995 #ifdef __BORLANDC__
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1011 =============================================================================
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1013 CACHE MANAGER ROUTINES
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1015 =============================================================================
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1019 ======================
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1023 ======================
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1026 /*void CAL_SetupGrFile (void)
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1031 #ifdef GRHEADERLINKED
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1033 #if GRMODE == EGAGR
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1034 grhuffman = (huffnode *)&EGAdict;
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1035 grstarts = (long _seg *)FP_SEG(&EGAhead);
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1037 #if GRMODE == CGAGR
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1038 grhuffman = (huffnode *)&CGAdict;
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1039 grstarts = (long _seg *)FP_SEG(&CGAhead);
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1042 CAL_OptimizeNodes (grhuffman);
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1047 // load ???dict.ext (huffman dictionary for graphics files)
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1050 if ((handle = open(GREXT"DICT."EXT,
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1051 O_RDONLY | O_BINARY, S_IREAD)) == -1)
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1052 Quit (gvar, "Can't open "GREXT"DICT."EXT"!");
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1054 read(handle, &grhuffman, sizeof(grhuffman));
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1056 CAL_OptimizeNodes (grhuffman);
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1058 // load the data offsets from ???head.ext
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1060 MM_GetPtr (&(memptr)grstarts,(NUMCHUNKS+1)*FILEPOSSIZE);
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1062 if ((handle = open(GREXT"HEAD."EXT,
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1063 O_RDONLY | O_BINARY, S_IREAD)) == -1)
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1064 Quit (gvar, "Can't open "GREXT"HEAD."EXT"!");
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1066 CA_FarRead(handle, (memptr)grstarts, (NUMCHUNKS+1)*FILEPOSSIZE);
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1074 // Open the graphics file, leaving it open until the game is finished
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1076 grhandle = open(GREXT"GRAPH."EXT, O_RDONLY | O_BINARY);
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1077 if (grhandle == -1)
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1078 Quit (gvar, "Cannot open "GREXT"GRAPH."EXT"!");
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1082 // load the pic and sprite headers into the arrays in the data segment
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1085 MM_GetPtr(&(memptr)pictable,NUMPICS*sizeof(pictabletype));
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1086 CAL_GetGrChunkLength(STRUCTPIC); // position file pointer
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1087 MM_GetPtr(&compseg,chunkcomplen);
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1088 CA_FarRead (grhandle,compseg,chunkcomplen);
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1089 CAL_HuffExpand (compseg, (byte far *)pictable,NUMPICS*sizeof(pictabletype),grhuffman);
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1090 MM_FreePtr(&compseg);
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1094 MM_GetPtr(&(memptr)picmtable,NUMPICM*sizeof(pictabletype));
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1095 CAL_GetGrChunkLength(STRUCTPICM); // position file pointer
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1096 MM_GetPtr(&compseg,chunkcomplen);
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1097 CA_FarRead (grhandle,compseg,chunkcomplen);
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1098 CAL_HuffExpand (compseg, (byte far *)picmtable,NUMPICS*sizeof(pictabletype),grhuffman);
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1099 MM_FreePtr(&compseg);
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1103 MM_GetPtr(&(memptr)spritetable,NUMSPRITES*sizeof(spritetabletype));
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1104 CAL_GetGrChunkLength(STRUCTSPRITE); // position file pointer
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1105 MM_GetPtr(&compseg,chunkcomplen);
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1106 CA_FarRead (grhandle,compseg,chunkcomplen);
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1107 CAL_HuffExpand (compseg, (byte far *)spritetable,NUMSPRITES*sizeof(spritetabletype),grhuffman);
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1108 MM_FreePtr(&compseg);
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1113 //==========================================================================
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1117 ======================
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1119 = CAL_SetupMapFile
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1121 ======================
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1124 void CAL_SetupMapFile (global_game_variables_t *gvar)
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1130 // load maphead.ext (offsets and tileinfo for map file)
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1132 #ifndef MAPHEADERLINKED
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1133 if ((handle = open("MAPHEAD."EXT,
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1134 O_RDONLY | O_BINARY, S_IREAD)) == -1)
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1135 printf("Can't open MAPHEAD."EXT"!");
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1136 length = filelength(handle);
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1137 MM_GetPtr (&(memptr)tinf,length);
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1138 CA_FarRead(handle, tinf, length);
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1142 tinf = (byte _seg *)FP_SEG(&maphead);
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1147 // open the data file
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1149 //TODO: multiple files
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1150 if ((gvar->ca.file.maphandle[0] = open("data/test.map",
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1151 O_RDONLY | O_BINARY, S_IREAD)) == -1)
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1153 printf("Can't open data/test.map!");
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1155 // #ifdef MAPHEADERLINKED
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1156 // if ((maphandle = open("GAMEMAPS."EXT,
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1157 // O_RDONLY | O_BINARY, S_IREAD)) == -1)
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1158 // Quit (gvar, "Can't open GAMEMAPS."EXT"!");
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1160 // if ((maphandle = open("MAPTEMP."EXT,
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1161 // O_RDONLY | O_BINARY, S_IREAD)) == -1)
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1162 // Quit (gvar, "Can't open MAPTEMP."EXT"!");
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1166 //==========================================================================
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1170 ======================
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1172 = CAL_SetupAudioFile
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1174 ======================
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1177 /*void CAL_SetupAudioFile (void)
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1183 // load maphead.ext (offsets and tileinfo for map file)
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1185 #ifndef AUDIOHEADERLINKED
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1186 if ((handle = open("AUDIOHED."EXT,
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1187 O_RDONLY | O_BINARY, S_IREAD)) == -1)
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1188 Quit (gvar, "Can't open AUDIOHED."EXT"!");
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1189 length = filelength(handle);
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1190 MM_GetPtr (&(memptr)audiostarts,length);
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1191 CA_FarRead(handle, (byte far *)audiostarts, length);
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1194 audiohuffman = (huffnode *)&audiodict;
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1195 CAL_OptimizeNodes (audiohuffman);
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1196 audiostarts = (long _seg *)FP_SEG(&audiohead);
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1200 // open the data file
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1202 #ifndef AUDIOHEADERLINKED
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1203 if ((audiohandle = open("AUDIOT."EXT,
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1204 O_RDONLY | O_BINARY, S_IREAD)) == -1)
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1205 Quit (gvar, "Can't open AUDIOT."EXT"!");
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1207 if ((audiohandle = open("AUDIO."EXT,
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1208 O_RDONLY | O_BINARY, S_IREAD)) == -1)
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1209 Quit (gvar, "Can't open AUDIO."EXT"!");
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1213 //==========================================================================
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1217 ======================
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1221 = Open all files and load in headers
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1223 ======================
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1226 void CA_Startup(global_game_variables_t *gvar)
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1229 #ifdef __BORLANDC__
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1230 unlink("profile.16b");
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1231 gvar->handle.profilehandle = open("profile.16b", O_CREAT | O_WRONLY | O_TEXT);
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1233 #ifdef __WATCOMC__
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1234 unlink("profile.16w");
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1235 gvar->handle.profilehandle = open("profile.16w", O_CREAT | O_WRONLY | O_TEXT);
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1239 #ifdef __BORLANDC__
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1240 unlink("meminfo.16b");
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1241 gvar->handle.showmemhandle = open("meminfo.16b", O_CREAT | O_WRONLY | O_TEXT);
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1243 #ifdef __WATCOMC__
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1244 unlink("meminfo.16w");
\r
1245 gvar->handle.showmemhandle = open("meminfo.16w", O_CREAT | O_WRONLY | O_TEXT);
\r
1248 CAL_SetupGrFile ();
\r
1249 CAL_SetupAudioFile ();*/
\r
1250 CAL_SetupMapFile (gvar);
\r
1252 gvar->ca.camap.mapon = -1;
\r
1253 gvar->ca.ca_levelbit = 1;
\r
1254 gvar->ca.ca_levelnum = 0;
\r
1256 /* drawcachebox = CAL_DialogDraw;
\r
1257 updatecachebox = CAL_DialogUpdate;
\r
1258 finishcachebox = CAL_DialogFinish;*/
\r
1261 //==========================================================================
\r
1265 ======================
\r
1269 = Closes all files
\r
1271 ======================
\r
1274 void CA_Shutdown(global_game_variables_t *gvar)
\r
1277 close(gvar->handle.profilehandle);
\r
1279 close(gvar->handle.showmemhandle);
\r
1281 close(*(gvar->ca.file.maphandle));
\r
1284 close(audiohandle);*/
\r
1287 //===========================================================================
\r
1290 ======================
\r
1292 = CA_CacheAudioChunk
\r
1294 ======================
\r
1297 void CA_CacheAudioChunk (int chunk)
\r
1299 long pos,compressed;
\r
1300 #ifdef AUDIOHEADERLINKED
\r
1302 memptr bigbufferseg;
\r
1306 if (audiosegs[chunk])
\r
1308 MM_SetPurge (&(memptr)audiosegs[chunk],0);
\r
1309 return; // allready in memory
\r
1312 // MDM begin - (GAMERS EDGE)
\r
1314 if (!FindFile("AUDIO."EXT,NULL,2))
\r
1315 Quit (gvar, "CA_CacheAudioChunk(): Can't find audio files.");
\r
1320 // load the chunk into a buffer, either the miscbuffer if it fits, or allocate
\r
1321 // a larger buffer
\r
1323 pos = audiostarts[chunk];
\r
1324 compressed = audiostarts[chunk+1]-pos;
\r
1326 lseek(audiohandle,pos,SEEK_SET);
\r
1328 #ifndef AUDIOHEADERLINKED
\r
1330 MM_GetPtr (&(memptr)audiosegs[chunk],compressed);
\r
1334 CA_FarRead(audiohandle,audiosegs[chunk],compressed);
\r
1338 if (compressed<=BUFFERSIZE)
\r
1340 CA_FarRead(audiohandle,bufferseg,compressed);
\r
1341 source = bufferseg;
\r
1345 MM_GetPtr(&bigbufferseg,compressed);
\r
1348 MM_SetLock (&bigbufferseg,true);
\r
1349 CA_FarRead(audiohandle,bigbufferseg,compressed);
\r
1350 source = bigbufferseg;
\r
1353 expanded = *(long far *)source;
\r
1354 source += 4; // skip over length
\r
1355 MM_GetPtr (&(memptr)audiosegs[chunk],expanded);
\r
1358 CAL_HuffExpand (source,audiosegs[chunk],expanded,audiohuffman);
\r
1361 if (compressed>BUFFERSIZE)
\r
1362 MM_FreePtr(&bigbufferseg);
\r
1366 //===========================================================================
\r
1369 ======================
\r
1371 = CA_LoadAllSounds
\r
1373 = Purges all sounds, then loads all new ones (mode switch)
\r
1375 ======================
\r
1378 void CA_LoadAllSounds (void)
\r
1382 switch (oldsoundmode)
\r
1387 start = STARTPCSOUNDS;
\r
1390 start = STARTADLIBSOUNDS;
\r
1394 for (i=0;i<NUMSOUNDS;i++,start++)
\r
1395 if (audiosegs[start])
\r
1396 MM_SetPurge (&(memptr)audiosegs[start],3); // make purgable
\r
1400 switch (SoundMode)
\r
1405 start = STARTPCSOUNDS;
\r
1408 start = STARTADLIBSOUNDS;
\r
1412 for (i=0;i<NUMSOUNDS;i++,start++)
\r
1413 CA_CacheAudioChunk (start);
\r
1415 oldsoundmode = SoundMode;
\r
1418 //===========================================================================
\r
1420 //++++#if GRMODE == EGAGR
\r
1423 ======================
\r
1427 = Make a shifted (one byte wider) copy of a sprite into another area
\r
1429 ======================
\r
1432 unsigned static sheight,swidth;
\r
1433 boolean static dothemask;
\r
1435 void CAL_ShiftSprite (unsigned segment,unsigned source,unsigned dest,
\r
1436 unsigned width, unsigned height, unsigned pixshift, boolean domask)
\r
1439 sheight = height; // because we are going to reassign bp
\r
1441 dothemask = domask;
\r
1443 asm mov ax,[segment]
\r
1444 asm mov ds,ax // source and dest are in same segment, and all local
\r
1446 asm mov bx,[source]
\r
1449 asm mov bp,[pixshift]
\r
1451 asm mov bp,WORD PTR [shifttabletable+bp] // bp holds pointer to shift table
\r
1453 asm cmp [ss:dothemask],0
\r
1457 // table shift the mask
\r
1459 asm mov dx,[ss:sheight]
\r
1463 asm mov BYTE PTR [di],255 // 0xff first byte
\r
1464 asm mov cx,ss:[swidth]
\r
1468 asm mov al,[bx] // source
\r
1470 asm inc bx // next source byte
\r
1474 asm mov ax,[bp+si] // table shift into two bytes
\r
1476 asm and [di],al // and with first byte
\r
1478 asm mov [di],ah // replace next byte
\r
1480 asm loop domaskbyte
\r
1482 asm inc di // the last shifted byte has 1s in it
\r
1489 // table shift the data
\r
1491 asm mov dx,ss:[sheight]
\r
1493 asm shl dx,1 // four planes of data
\r
1497 asm mov BYTE PTR [di],0 // 0 first byte
\r
1498 asm mov cx,ss:[swidth]
\r
1502 asm mov al,[bx] // source
\r
1503 asm inc bx // next source byte
\r
1507 asm mov ax,[bp+si] // table shift into two bytes
\r
1508 asm or [di],al // or with first byte
\r
1510 asm mov [di],ah // replace next byte
\r
1512 asm loop dodatabyte
\r
1514 asm inc di // the last shifted byte has 0s in it
\r
1522 asm mov ax,ss // restore data segment
\r
1529 //===========================================================================
\r
1532 ======================
\r
1536 = Generate shifts and set up sprite structure for a given sprite
\r
1538 ======================
\r
1541 void CAL_CacheSprite (int chunk, byte far *compressed)
\r
1544 unsigned shiftstarts[5];
\r
1545 unsigned smallplane,bigplane,expanded;
\r
1546 spritetabletype far *spr;
\r
1547 spritetype _seg *dest;
\r
1549 #if GRMODE == CGAGR
\r
1551 // CGA has no pel panning, so shifts are never needed
\r
1553 spr = &spritetable[chunk-STARTSPRITES];
\r
1554 smallplane = spr->width*spr->height;
\r
1555 MM_GetPtr (&grsegs[chunk],smallplane*2+MAXSHIFTS*6);
\r
1558 dest = (spritetype _seg *)grsegs[chunk];
\r
1559 dest->sourceoffset[0] = MAXSHIFTS*6; // start data after 3 unsigned tables
\r
1560 dest->planesize[0] = smallplane;
\r
1561 dest->width[0] = spr->width;
\r
1564 // expand the unshifted shape
\r
1566 CAL_HuffExpand (compressed, &dest->data[0],smallplane*2,grhuffman);
\r
1571 #if GRMODE == EGAGR
\r
1574 // calculate sizes
\r
1576 spr = &spritetable[chunk-STARTSPRITES];
\r
1577 smallplane = spr->width*spr->height;
\r
1578 bigplane = (spr->width+1)*spr->height;
\r
1580 shiftstarts[0] = MAXSHIFTS*6; // start data after 3 unsigned tables
\r
1581 shiftstarts[1] = shiftstarts[0] + smallplane*5; // 5 planes in a sprite
\r
1582 shiftstarts[2] = shiftstarts[1] + bigplane*5;
\r
1583 shiftstarts[3] = shiftstarts[2] + bigplane*5;
\r
1584 shiftstarts[4] = shiftstarts[3] + bigplane*5; // nothing ever put here
\r
1586 expanded = shiftstarts[spr->shifts];
\r
1587 MM_GetPtr (&grsegs[chunk],expanded);
\r
1590 dest = (spritetype _seg *)grsegs[chunk];
\r
1593 // expand the unshifted shape
\r
1595 CAL_HuffExpand (compressed, &dest->data[0],smallplane*5,grhuffman);
\r
1598 // make the shifts!
\r
1600 switch (spr->shifts)
\r
1605 dest->sourceoffset[i] = shiftstarts[0];
\r
1606 dest->planesize[i] = smallplane;
\r
1607 dest->width[i] = spr->width;
\r
1614 dest->sourceoffset[i] = shiftstarts[0];
\r
1615 dest->planesize[i] = smallplane;
\r
1616 dest->width[i] = spr->width;
\r
1620 dest->sourceoffset[i] = shiftstarts[1];
\r
1621 dest->planesize[i] = bigplane;
\r
1622 dest->width[i] = spr->width+1;
\r
1624 CAL_ShiftSprite ((unsigned)grsegs[chunk],dest->sourceoffset[0],
\r
1625 dest->sourceoffset[2],spr->width,spr->height,4,true);
\r
1629 dest->sourceoffset[0] = shiftstarts[0];
\r
1630 dest->planesize[0] = smallplane;
\r
1631 dest->width[0] = spr->width;
\r
1633 dest->sourceoffset[1] = shiftstarts[1];
\r
1634 dest->planesize[1] = bigplane;
\r
1635 dest->width[1] = spr->width+1;
\r
1636 CAL_ShiftSprite ((unsigned)grsegs[chunk],dest->sourceoffset[0],
\r
1637 dest->sourceoffset[1],spr->width,spr->height,2,true);
\r
1639 dest->sourceoffset[2] = shiftstarts[2];
\r
1640 dest->planesize[2] = bigplane;
\r
1641 dest->width[2] = spr->width+1;
\r
1642 CAL_ShiftSprite ((unsigned)grsegs[chunk],dest->sourceoffset[0],
\r
1643 dest->sourceoffset[2],spr->width,spr->height,4,true);
\r
1645 dest->sourceoffset[3] = shiftstarts[3];
\r
1646 dest->planesize[3] = bigplane;
\r
1647 dest->width[3] = spr->width+1;
\r
1648 CAL_ShiftSprite ((unsigned)grsegs[chunk],dest->sourceoffset[0],
\r
1649 dest->sourceoffset[3],spr->width,spr->height,6,true);
\r
1654 Quit (gvar, "CAL_CacheSprite: Bad shifts number!");
\r
1660 //===========================================================================
\r
1664 ======================
\r
1666 = CAL_ExpandGrChunk
\r
1668 = Does whatever is needed with a pointer to a compressed chunk
\r
1670 ======================
\r
1673 void CAL_ExpandGrChunk (int chunk, byte far *source)
\r
1678 if (chunk >= STARTTILE8 && chunk < STARTEXTERNS)
\r
1681 // expanded sizes of tile8/16/32 are implicit
\r
1684 #if GRMODE == EGAGR
\r
1686 #define MASKBLOCK 40
\r
1689 #if GRMODE == CGAGR
\r
1691 #define MASKBLOCK 32
\r
1694 if (chunk<STARTTILE8M) // tile 8s are all in one chunk!
\r
1695 expanded = BLOCK*NUMTILE8;
\r
1696 else if (chunk<STARTTILE16)
\r
1697 expanded = MASKBLOCK*NUMTILE8M;
\r
1698 else if (chunk<STARTTILE16M) // all other tiles are one/chunk
\r
1699 expanded = BLOCK*4;
\r
1700 else if (chunk<STARTTILE32)
\r
1701 expanded = MASKBLOCK*4;
\r
1702 else if (chunk<STARTTILE32M)
\r
1703 expanded = BLOCK*16;
\r
1705 expanded = MASKBLOCK*16;
\r
1710 // everything else has an explicit size longword
\r
1712 expanded = *(long far *)source;
\r
1713 source += 4; // skip over length
\r
1717 // allocate final space, decompress it, and free bigbuffer
\r
1718 // Sprites need to have shifts made and various other junk
\r
1720 if (chunk>=STARTSPRITES && chunk< STARTTILE8)
\r
1721 CAL_CacheSprite(chunk,source);
\r
1724 MM_GetPtr (&grsegs[chunk],expanded);
\r
1727 CAL_HuffExpand (source,grsegs[chunk],expanded,grhuffman);
\r
1733 ======================
\r
1737 = Gets a chunk off disk, optimizing reads to general buffer
\r
1739 ======================
\r
1742 void CAL_ReadGrChunk (int chunk)
\r
1744 long pos,compressed;
\r
1745 memptr bigbufferseg;
\r
1750 // load the chunk into a buffer, either the miscbuffer if it fits, or allocate
\r
1751 // a larger buffer
\r
1753 pos = GRFILEPOS(chunk);
\r
1754 if (pos<0) // $FFFFFFFF start is a sparse tile
\r
1758 while (GRFILEPOS(next) == -1) // skip past any sparse tiles
\r
1761 compressed = GRFILEPOS(next)-pos;
\r
1763 lseek(grhandle,pos,SEEK_SET);
\r
1765 if (compressed<=BUFFERSIZE)
\r
1767 CA_FarRead(grhandle,bufferseg,compressed);
\r
1768 source = bufferseg;
\r
1772 MM_GetPtr(&bigbufferseg,compressed);
\r
1775 MM_SetLock (&bigbufferseg,true);
\r
1776 CA_FarRead(grhandle,bigbufferseg,compressed);
\r
1777 source = bigbufferseg;
\r
1780 CAL_ExpandGrChunk (chunk,source);
\r
1782 if (compressed>BUFFERSIZE)
\r
1783 MM_FreePtr(&bigbufferseg);
\r
1787 ======================
\r
1791 = Makes sure a given chunk is in memory, loadiing it if needed
\r
1793 ======================
\r
1796 void CA_CacheGrChunk (int chunk)
\r
1798 long pos,compressed;
\r
1799 memptr bigbufferseg;
\r
1803 gvar->video.grneeded[chunk] |= ca_levelbit; // make sure it doesn't get removed
\r
1804 if (grsegs[chunk])
\r
1806 MM_SetPurge (&grsegs[chunk],0);
\r
1807 return; // allready in memory
\r
1810 // MDM begin - (GAMERS EDGE)
\r
1812 if (!FindFile("EGAGRAPH."EXT,NULL,2))
\r
1813 Quit (gvar, "CA_CacheGrChunk(): Can't find graphics files.");
\r
1818 // load the chunk into a buffer, either the miscbuffer if it fits, or allocate
\r
1819 // a larger buffer
\r
1821 pos = GRFILEPOS(chunk);
\r
1822 if (pos<0) // $FFFFFFFF start is a sparse tile
\r
1826 while (GRFILEPOS(next) == -1) // skip past any sparse tiles
\r
1829 compressed = GRFILEPOS(next)-pos;
\r
1831 lseek(grhandle,pos,SEEK_SET);
\r
1833 if (compressed<=BUFFERSIZE)
\r
1835 CA_FarRead(grhandle,bufferseg,compressed);
\r
1836 source = bufferseg;
\r
1840 MM_GetPtr(&bigbufferseg,compressed);
\r
1841 MM_SetLock (&bigbufferseg,true);
\r
1842 CA_FarRead(grhandle,bigbufferseg,compressed);
\r
1843 source = bigbufferseg;
\r
1846 CAL_ExpandGrChunk (chunk,source);
\r
1848 if (compressed>BUFFERSIZE)
\r
1849 MM_FreePtr(&bigbufferseg);
\r
1854 //==========================================================================
\r
1857 ======================
\r
1861 ======================
\r
1864 void CA_CacheMap (global_game_variables_t *gvar)
\r
1866 long pos,compressed;
\r
1868 memptr *dest,bigbufferseg;
\r
1870 unsigned far *source;
\r
1871 #ifdef MAPHEADERLINKED
\r
1872 memptr buffer2seg;
\r
1878 // free up memory from last map
\r
1880 if (gvar->ca.camap.mapon>-1 && gvar->ca.camap.mapheaderseg[gvar->ca.camap.mapon])
\r
1881 MM_SetPurge (((memptr)gvar->ca.camap.mapheaderseg[(gvar->ca.camap.mapon)]), 3, gvar);
\r
1882 for (plane=0;plane<MAPPLANES;plane++)
\r
1883 if (gvar->ca.camap.mapsegs[plane])
\r
1884 MM_FreePtr ((memptr)gvar->ca.camap.mapsegs[plane], gvar);
\r
1886 gvar->ca.camap.mapon = gvar->ca.camap.mapnum;
\r
1890 // load map header
\r
1891 // The header will be cached if it is still around
\r
1893 // if (!gvar->ca.camap.mapheaderseg[gvar->ca.camap.mapnum])
\r
1895 // //pos = ((mapfiletype _seg *)tinf)->headeroffsets[mapnum];
\r
1896 // //pos = ((_seg *)gvar->ca.camap.tinf)->headeroffsets[gvar->ca.camap.mapnum];
\r
1897 // pos = ((memptr)gvar->ca.camap.tinf)->headeroffsets[gvar->ca.camap.mapnum];
\r
1898 // if (pos<0) // $FFFFFFFF start is a sparse map
\r
1899 // printf("CA_CacheMap: Tried to load a non existent map!");
\r
1901 // MM_GetPtr(&(memptr)gvar->ca.camapheaderseg[mapnum],sizeof(maptype));
\r
1902 // lseek(maphandle,pos,SEEK_SET);
\r
1903 // CA_FarRead (maphandle,(memptr)mapheaderseg[mapnum],sizeof(maptype));
\r
1906 // MM_SetPurge (&(memptr)mapheaderseg[mapnum], 0, &(gvar->mm));
\r
1909 // load the planes in
\r
1910 // If a plane's pointer still exists it will be overwritten (levels are
\r
1911 // allways reloaded, never cached)
\r
1914 size = mapheaderseg[mapnum]->width * mapheaderseg[mapnum]->height * 2;
\r
1916 for (plane = 0; plane<MAPPLANES; plane++)
\r
1918 //pos = mapheaderseg[mapnum]->planestart[plane];
\r
1919 //compressed = mapheaderseg[mapnum]->planelength[plane];
\r
1922 continue; // the plane is not used in this game
\r
1924 dest = &(memptr)mapsegs[plane];
\r
1925 MM_GetPtr(dest,size);
\r
1927 lseek(maphandle,pos,SEEK_SET);
\r
1928 if (compressed<=BUFFERSIZE)
\r
1929 source = bufferseg;
\r
1932 MM_GetPtr(&bigbufferseg,compressed);
\r
1933 MM_SetLock (&bigbufferseg,true);
\r
1934 source = bigbufferseg;
\r
1937 CA_FarRead(maphandle,(byte far *)source,compressed);
\r
1938 #ifdef MAPHEADERLINKED
\r
1940 // unhuffman, then unRLEW
\r
1941 // The huffman'd chunk has a two byte expanded length first
\r
1942 // The resulting RLEW chunk also does, even though it's not really
\r
1945 expanded = *source;
\r
1947 MM_GetPtr (&buffer2seg,expanded);
\r
1948 CAL_CarmackExpand (source, (unsigned far *)buffer2seg,expanded);
\r
1949 CA_RLEWexpand (((unsigned far *)buffer2seg)+1,*dest,size,
\r
1950 ((mapfiletype _seg *)tinf)->RLEWtag);
\r
1951 MM_FreePtr (&buffer2seg);
\r
1955 // unRLEW, skipping expanded length
\r
1957 CA_RLEWexpand (source+1, *dest,size,
\r
1958 ((mapfiletype _seg *)tinf)->RLEWtag);
\r
1961 if (compressed>BUFFERSIZE)
\r
1962 MM_FreePtr(&bigbufferseg);
\r
1966 //===========================================================================
\r
1969 ======================
\r
1973 = Goes up a bit level in the needed lists and clears it out.
\r
1974 = Everything is made purgable
\r
1976 ======================
\r
1979 void CA_UpLevel (global_game_variables_t *gvar)
\r
1981 if (gvar->ca.ca_levelnum==7)
\r
1982 printf("CA_UpLevel: Up past level 7!");
\r
1984 gvar->ca.ca_levelbit<<=1;
\r
1985 gvar->ca.ca_levelnum++;
\r
1988 //===========================================================================
\r
1991 ======================
\r
1995 = Goes down a bit level in the needed lists and recaches
\r
1996 = everything from the lower level
\r
1998 ======================
\r
2001 void CA_DownLevel (global_game_variables_t *gvar)
\r
2003 if (!gvar->ca.ca_levelnum)
\r
2004 printf("CA_DownLevel: Down past level 0!");
\r
2005 gvar->ca.ca_levelbit>>=1;
\r
2006 gvar->ca.ca_levelnum--;
\r
2007 ////++++++++++++++++++++++++++++++++++++++++++CA_CacheMarks(NULL);
\r
2010 //===========================================================================
\r
2013 ======================
\r
2017 = Clears out all the marks at the current level
\r
2019 ======================
\r
2022 void CA_ClearMarks (global_game_variables_t *gvar)
\r
2026 for (i=0;i<NUMCHUNKS;i++)
\r
2027 gvar->video.grneeded[i]&=~gvar->ca.ca_levelbit;
\r
2030 //===========================================================================
\r
2033 ======================
\r
2035 = CA_ClearAllMarks
\r
2037 = Clears out all the marks on all the levels
\r
2039 ======================
\r
2042 void CA_ClearAllMarks (global_game_variables_t *gvar)
\r
2044 _fmemset (gvar->video.grneeded,0,sizeof(gvar->video.grneeded));
\r
2045 gvar->ca.ca_levelbit = 1;
\r
2046 gvar->ca.ca_levelnum = 0;
\r
2049 //===========================================================================
\r
2052 ======================
\r
2056 ======================
\r
2059 void CA_SetGrPurge (global_game_variables_t *gvar)
\r
2066 CA_ClearMarks (gvar);
\r
2068 for (i=0;i<NUMCHUNKS;i++)
\r
2069 if (gvar->ca.grsegs[i])
\r
2070 MM_SetPurge (gvar->ca.grsegs[i],3, gvar);
\r
2075 ======================
\r
2079 = Make everything possible purgable
\r
2081 ======================
\r
2084 void CA_SetAllPurge (global_game_variables_t *gvar)
\r
2088 CA_ClearMarks (gvar);
\r
2091 // free cursor sprite and background save
\r
2093 //____VW_FreeCursor ();
\r
2096 // free map headers and map planes
\r
2098 // for (i=0;i<NUMMAPS;i++)
\r
2099 // if (gvar->ca.camap.mapheaderseg[i])
\r
2100 // MM_SetPurge (gvar->ca.camap.mapheaderseg[i],3, gvar);
\r
2103 if (gvar->ca.mapsegs[i])
\r
2104 MM_FreePtr ((memptr *)&gvar->ca.mapsegs[i], gvar);
\r
2109 for (i=0;i<NUMSNDCHUNKS;i++)
\r
2110 if (gvar->ca.audiosegs[i])
\r
2111 MM_SetPurge ((memptr *)&gvar->ca.audiosegs[i],3, gvar);
\r
2116 CA_SetGrPurge (gvar);
\r
2120 //===========================================================================
\r
2124 ======================
\r
2128 ======================
\r
2131 #define NUMBARS (17l*8)
\r
2134 unsigned thx,thy,lastx;
\r
2135 long barx,barstep;
\r
2137 void CAL_DialogDraw (char *title,unsigned numcache)
\r
2139 unsigned homex,homey,x;
\r
2141 barstep = (NUMBARS<<16)/numcache;
\r
2144 // draw dialog window (masked tiles 12 - 20 are window borders)
\r
2146 US_CenterWindow (20,8);
\r
2150 US_CPrint ("Loading");
\r
2151 fontcolor = F_SECONDCOLOR;
\r
2152 US_CPrint (title);
\r
2153 fontcolor = F_BLACK;
\r
2156 // draw thermometer bar
\r
2160 VWB_DrawTile8(thx,thy,0); // CAT3D numbers
\r
2161 VWB_DrawTile8(thx,thy+8,3);
\r
2162 VWB_DrawTile8(thx,thy+16,6);
\r
2163 VWB_DrawTile8(thx+17*8,thy,2);
\r
2164 VWB_DrawTile8(thx+17*8,thy+8,5);
\r
2165 VWB_DrawTile8(thx+17*8,thy+16,8);
\r
2166 for (x=thx+8;x<thx+17*8;x+=8)
\r
2168 VWB_DrawTile8(x,thy,1);
\r
2169 VWB_DrawTile8(x,thy+8,4);
\r
2170 VWB_DrawTile8(x,thy+16,7);
\r
2173 thx += 4; // first line location
\r
2175 barx = (long)thx<<16;
\r
2178 VW_UpdateScreen();
\r
2183 ======================
\r
2185 = CAL_DialogUpdate
\r
2187 ======================
\r
2190 void CAL_DialogUpdate (void)
\r
2196 if (xh - lastx > BARSTEP)
\r
2198 for (x=lastx;x<=xh;x++)
\r
2199 #if GRMODE == EGAGR
\r
2200 VWB_Vlin (thy,thy+13,x,14);
\r
2202 #if GRMODE == CGAGR
\r
2203 VWB_Vlin (thy,thy+13,x,SECONDCOLOR);
\r
2206 VW_UpdateScreen();
\r
2211 ======================
\r
2213 = CAL_DialogFinish
\r
2215 ======================
\r
2218 void CAL_DialogFinish (void)
\r
2222 xh = thx + NUMBARS;
\r
2223 for (x=lastx;x<=xh;x++)
\r
2224 #if GRMODE == EGAGR
\r
2225 VWB_Vlin (thy,thy+13,x,14);
\r
2227 #if GRMODE == CGAGR
\r
2228 VWB_Vlin (thy,thy+13,x,SECONDCOLOR);
\r
2230 VW_UpdateScreen();
\r
2234 //===========================================================================
\r
2237 ======================
\r
2241 ======================
\r
2243 #define MAXEMPTYREAD 1024
\r
2245 void CAL_CacheMarks (char *title, global_game_variables_t *gvar)
\r
2248 int i,next,numcache;
\r
2249 long pos,endpos,nextpos,nextendpos,compressed;
\r
2250 long bufferstart,bufferend; // file position of general buffer
\r
2252 memptr bigbufferseg;
\r
2254 dialog = (title!=NULL);
\r
2258 // go through and make everything not needed purgable
\r
2260 for (i=0;i<NUMCHUNKS;i++)
\r
2261 if (gvar->ca.grneeded[i]&(gvar->ca.ca_levelbit))//if (grneeded[i]&ca_levelbit)
\r
2263 if (gvar->ca.grsegs[i]) // its allready in memory, make
\r
2264 MM_SetPurge(gvar->ca.grsegs[i],0,gvar); // sure it stays there!
\r
2270 if (gvar->ca.grsegs[i]) // not needed, so make it purgeable
\r
2271 MM_SetPurge(gvar->ca.grsegs[i],3,gvar);
\r
2274 if (!numcache) // nothing to cache!
\r
2277 // MDM begin - (GAMERS EDGE)
\r
2279 // if (!FindFile("EGAGRAPH."EXT,NULL,2))
\r
2280 // Quit (gvar, "CA_CacheMarks(): Can't find graphics files.");
\r
2287 write(profilehandle,title,strlen(title));
\r
2288 write(profilehandle,"\n",1);
\r
2291 drawcachebox(title,numcache);
\r
2295 // go through and load in anything still needed
\r
2297 bufferstart = bufferend = 0; // nothing good in buffer now
\r
2299 for (i=0;i<NUMCHUNKS;i++)
\r
2300 if ( (gvar->ca.grneeded[i]&(gvar->ca.ca_levelbit)) && !gvar->ca.grsegs[i])
\r
2303 // update thermometer
\r
2305 if (dialog && updatecachebox)
\r
2306 updatecachebox ();
\r
2308 pos = GRFILEPOS(i);
\r
2313 while (GRFILEPOS(next) == -1) // skip past any sparse tiles
\r
2316 compressed = GRFILEPOS(next)-pos;
\r
2317 endpos = pos+compressed;
\r
2319 if (compressed<=BUFFERSIZE)
\r
2321 if (bufferstart<=pos
\r
2322 && bufferend>= endpos)
\r
2324 // data is allready in buffer
\r
2325 source = (byte _seg *)bufferseg+(pos-bufferstart);
\r
2329 // load buffer with a new block from disk
\r
2330 // try to get as many of the needed blocks in as possible
\r
2331 while ( next < NUMCHUNKS )
\r
2333 while (next < NUMCHUNKS &&
\r
2334 !(gvar->video.grneeded[next]&ca_levelbit && !grsegs[next]))
\r
2336 if (next == NUMCHUNKS)
\r
2339 nextpos = GRFILEPOS(next);
\r
2340 while (GRFILEPOS(++next) == -1) // skip past any sparse tiles
\r
2342 nextendpos = GRFILEPOS(next);
\r
2343 if (nextpos - endpos <= MAXEMPTYREAD
\r
2344 && nextendpos-pos <= BUFFERSIZE)
\r
2345 endpos = nextendpos;
\r
2347 next = NUMCHUNKS; // read pos to posend
\r
2350 lseek(grhandle,pos,SEEK_SET);
\r
2351 CA_FarRead(grhandle,(gvar->mm.bufferseg),endpos-pos,gvar);
\r
2352 bufferstart = pos;
\r
2353 bufferend = endpos;
\r
2354 source = bufferseg;
\r
2359 // big chunk, allocate temporary buffer
\r
2360 MM_GetPtr(&bigbufferseg,compressed,gvar);
\r
2363 MM_SetLock (&bigbufferseg,true);
\r
2364 lseek(grhandle,pos,SEEK_SET);
\r
2365 CA_FarRead(grhandle,bigbufferseg,compressed,gvar);
\r
2366 source = bigbufferseg;
\r
2369 CAL_ExpandGrChunk (i,source);
\r
2373 if (compressed>BUFFERSIZE)
\r
2374 MM_FreePtr(&bigbufferseg);
\r
2379 // finish up any thermometer remnants
\r
2381 if (dialog && finishcachebox)
\r