dictionary.c

使用visual studio 2005 开发的开源文件、磁盘加密软件。这是6.1a版。加密自己资料的好工具。也是学习的优秀范本。结成了众多加密算法。

/*
 Copyright (c) 2005 TrueCrypt Foundation. All rights reserved.

 Governed by the TrueCrypt License 2.6 the full text of which is contained
 in the file License.txt included in TrueCrypt binary and source code
 distribution packages.
*/

#include "../Common/Dictionary.h"
#include <windows.h>

static DictionaryEntry StringDictionary[4096];
static int LastDictionaryEntry = -1;
static int MaxDictionaryEntry = sizeof (StringDictionary) / sizeof (DictionaryEntry) - 1;

static void *DataPool = NULL;
static size_t DataPoolSize = 0;

int AddDictionaryEntry (char *key, int intKey, void *value)
{
	int i;
	if (LastDictionaryEntry >= MaxDictionaryEntry) return -1;

	// Replace identical key if it exists
	for (i = 0; i <= LastDictionaryEntry; i++)
	{
		if ((StringDictionary[i].Key != NULL
			&& key != NULL
			&& strcmp (StringDictionary[i].Key, key) == 0)
			|| (key == NULL && StringDictionary[i].IntKey == intKey))
		{
			StringDictionary[i].Key = key;
			StringDictionary[i].IntKey = intKey;
			StringDictionary[i].Value = value;

			return i;
		}
	}

	LastDictionaryEntry++;

	StringDictionary[LastDictionaryEntry].Key = key;
	StringDictionary[LastDictionaryEntry].IntKey = intKey;
	StringDictionary[LastDictionaryEntry].Value = value;

	return LastDictionaryEntry;
}


void *GetDictionaryValue (const char *key)
{
	int i;
	for (i = 0; i <= LastDictionaryEntry; i++)
	{
		if (StringDictionary[i].Key != NULL
			&& strcmp (StringDictionary[i].Key, key) == 0)
			return StringDictionary[i].Value;
	}

	return NULL;
}


void *GetDictionaryValueByInt (int intKey)
{
	int i;
	for (i = 0; i <= LastDictionaryEntry; i++)
	{
		if (StringDictionary[i].IntKey == intKey)
			return StringDictionary[i].Value;
	}

	return NULL;
}


void *AddPoolData (void *data, size_t dataSize)
{

	if (DataPoolSize + dataSize > DATA_POOL_CAPACITY) return NULL;

	if (DataPool == NULL)
	{
		DataPool = malloc (DATA_POOL_CAPACITY);
		if (DataPool == NULL) return NULL;
	}

	memcpy ((BYTE *)DataPool + DataPoolSize, data, dataSize);

	//if (wcschr((WCHAR *)((BYTE *)DataPool + DataPoolSize), '%') == 0)
	//	_wcsupr ((WCHAR *)((BYTE *)DataPool + DataPoolSize));
	//else
	//	((WCHAR *)((BYTE *)DataPool + DataPoolSize))[0] = L'*';

	// Ensure 32-bit alignment for next entries
	dataSize = (dataSize + 3) & (~(size_t)3);

	DataPoolSize += dataSize;
	return (BYTE *)DataPool + DataPoolSize - dataSize;
}


void ClearDictionaryPool ()
{
	DataPoolSize = 0;
	LastDictionaryEntry = -1;
}