LGram16
dd97ddec92
Move git root from Client/ to src/ to track all source code: - Client: Game client source (moved to Client/Client/) - Server: Game server source - GameTools: Development tools - CryptoSource: Encryption utilities - database: Database scripts - Script: Game scripts - rylCoder_16.02.2008_src: Legacy coder tools - GMFont, Game: Additional resources 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
153 lines
3.2 KiB
C
153 lines
3.2 KiB
C
//-----------------------------------------------------------------------------
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//
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// ImageLib Sources
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// Copyright (C) 2000-2002 by Denton Woods
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// Last modified: 05/25/2001 <--Y2K Compliant! =]
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//
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// Filename: src-IL/src/il_bits.c
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//
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// Description: Implements a file class that reads/writes bits directly.
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//
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//-----------------------------------------------------------------------------
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#include "il_internal.h"
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#include "il_bits.h"
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// Opens a BITFILE just like fopen opens a FILE.
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/*BITFILE *bopen(const char *FileName, const char *Mode)
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{
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BITFILE *ToReturn = NULL;
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if (FileName != NULL) {
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ToReturn = (BITFILE*)ialloc(sizeof(BITFILE));
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if (ToReturn != NULL) {
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iopenr((char*)FileName);
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ToReturn->File = iGetFile();
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ToReturn->BitPos = 0;
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ToReturn->ByteBitOff = 8;
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ToReturn->Buff = 0;
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}
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}
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return ToReturn;
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}*/
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// Converts a FILE to a BITFILE.
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BITFILE *bfile(ILHANDLE File)
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{
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BITFILE *ToReturn = NULL;
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if (File != NULL) {
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ToReturn = (BITFILE*)ialloc(sizeof(BITFILE));
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if (ToReturn != NULL) {
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ToReturn->File = File;
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ToReturn->BitPos = itell() << 3;
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ToReturn->ByteBitOff = 8;
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ToReturn->Buff = 0;
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}
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}
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return ToReturn;
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}
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// Closes an open BITFILE and frees memory for it.
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ILint bclose(BITFILE *BitFile)
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{
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if (BitFile == NULL || BitFile->File == NULL)
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return IL_EOF;
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icloser(BitFile->File);
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ifree(BitFile);
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return 0;
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}
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// Returns the current bit position of a BITFILE.
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ILint btell(BITFILE *BitFile)
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{
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return BitFile->BitPos;
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}
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// Seeks in a BITFILE just like fseek for FILE.
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ILint bseek(BITFILE *BitFile, ILuint Offset, ILuint Mode)
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{
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ILint KeepPos, Len;
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if (BitFile == NULL || BitFile->File == NULL)
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return 1;
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switch (Mode)
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{
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case IL_SEEK_SET:
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if (iseek(Offset >> 3, Mode)) {
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BitFile->BitPos = Offset;
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BitFile->ByteBitOff = BitFile->BitPos % 8;
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}
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break;
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case IL_SEEK_CUR:
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if (iseek(Offset >> 3, Mode)) {
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BitFile->BitPos += Offset;
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BitFile->ByteBitOff = BitFile->BitPos % 8;
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}
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break;
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case IL_SEEK_END:
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KeepPos = itell();
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iseek(0, IL_SEEK_END);
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Len = itell();
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iseek(0, IL_SEEK_SET);
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if (iseek(Offset >> 3, Mode)) {
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BitFile->BitPos = (Len << 3) + Offset;
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BitFile->ByteBitOff = BitFile->BitPos % 8;
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}
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break;
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default:
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return 1;
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}
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return 0;
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}
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// hehe, "bread". It reads data into Buffer from the BITFILE, just like fread for FILE.
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ILint bread(ILvoid *Buffer, ILuint Size, ILuint Number, BITFILE *BitFile)
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{
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//Note that this function is somewhat useless: In binary image
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//formats, there are some pad bits after each scanline. This
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//function does not take that into account, so...
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ILuint BuffPos = 0, Count = Size * Number;
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while (BuffPos < Count) {
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if (BitFile->ByteBitOff < 0 || BitFile->ByteBitOff > 7) {
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BitFile->ByteBitOff = 7;
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if (iread(&BitFile->Buff, 1, 1) != 1) // Reached eof or error...
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return BuffPos;
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}
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*((ILubyte*)(Buffer) + BuffPos) = (ILubyte)!!(BitFile->Buff & (1 << BitFile->ByteBitOff));
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BuffPos++;
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BitFile->ByteBitOff--;
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}
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return BuffPos;
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}
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// Not implemented yet.
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/*ILint bwrite(ILvoid *Buffer, ILuint Size, ILuint Number, BITFILE *BitFile)
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{
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return 0;
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}*/
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