Function ILAPIENTRY iReadFile

DevIL/src-IL/src/il_files.cpp:462–513

ILuint ILAPIENTRY iReadFile(void *Buffer, ILuint Size, ILuint Number)
{
	ILuint	TotalBytes = 0, BytesCopied;
	ILuint	BuffSize = Size * Number;
	ILuint	NumRead;

	if (!UseCache) {
		NumRead = ReadProc(Buffer, Size, Number, FileRead);
		if (NumRead != Number)
			ilSetError(IL_FILE_READ_ERROR);
		return NumRead;
	}

	/*if (Cache == NULL || CacheSize == 0) {  // Shouldn't happen, but we check anyway.
		return ReadProc(Buffer, Size, Number, FileRead);
	}*/

	if (BuffSize < CacheSize - CachePos) {
		memcpy(Buffer, Cache + CachePos, BuffSize);
		CachePos += BuffSize;
		CacheBytesRead += BuffSize;
		if (Size != 0)
			BuffSize /= Size;
		return BuffSize;
	}
	else {
		while (TotalBytes < BuffSize) {
			// If loop through more than once, after first, CachePos is 0.
			if (TotalBytes + CacheSize - CachePos > BuffSize)
				BytesCopied = BuffSize - TotalBytes;
			else
				BytesCopied = CacheSize - CachePos;

			memcpy((ILubyte*)Buffer + TotalBytes, Cache + CachePos, BytesCopied);
			TotalBytes += BytesCopied;
			CachePos += BytesCopied;
			if (TotalBytes < BuffSize) {
				iPreCache(CacheSize);
			}
		}
	}

	// DW: Changed on 12-27-2008.  Was causing the position to go too far if the
	//     cache was smaller than the buffer.
	//CacheBytesRead += TotalBytes;
	CacheBytesRead = CachePos;
	if (Size != 0)
		TotalBytes /= Size;
	if (TotalBytes != Number)
		ilSetError(IL_FILE_READ_ERROR);
	return TotalBytes;
}


ILuint ILAPIENTRY iReadLump(void *Buffer, const ILuint Size, const ILuint Number)