linux应用程序_1_文本浏览器_2_encoding_1_encoding_manager

linux应用程序_1_文本浏览器_2_encoding_1_encoding_manager

所有支持的编码格式都由encoding_manager统一管理

一、抽象一个编码结构体

二、向下提供接口

1、添加能够支持的字库信息

2、注册编码结构体

三、向上提供接口

所有编码初始化

根据文本编码格式，选择一个编码结构体

抽象结构体的依据：

1、不同编码文件的首部标识符长度、标识符内容是不一样

ascii     ：没有

utf-8     ：0xEF, 0xBB, 0xBF

utf-16le ：0xFF, 0xFE,

utf-16be：0xFE, 0xFF,

2、结构体应知道自己是否支持当前打开的文本

3、结构体要有一个链表，列出自己可以使用的字库

4、结构体要有获取字符的能力

5、结构体应该有自己的名字、用以区分同类的其他结构体

6、结构体应该有一个链表，与同类的其他结构体建立联系

因此抽象出结构体：

typedef struct EncodingOpr{
	char *pcName;
	
	int   iHeadLen;
	
	PT_FontOpr ptFontOprSupportHead;
	
	int (*IsSuppot)(char *pcBufHead);
	int (*GetCode)(unsigned char *pucBufStart, unsigned char *pucBufEnd, unsigned int *pudwCode);
	
	struct EncodingOpr *ptNext;	
}T_EncodingOpr, *PT_EncodingOpr;

注册：

依据打开文件的头部标识符判断是否支持该编码，若支持，将其添加到链尾

int RegisterEncoding(PT_EncodingOpr ptEncodingOpr)
{
	PT_EncodingOpr ptEncodingOprTmp;
	
	if(!g_ptEncodingOpr)
	{
		g_ptEncodingOpr = ptEncodingOpr;
		g_ptEncodingOpr->ptNext = NULL;
	}
	else
	{
		ptEncodingOprTmp = g_ptEncodingOpr;
		while(ptEncodingOprTmp->ptNext)
		{
			ptEncodingOprTmp = ptEncodingOprTmp->ptNext;
		}
		ptEncodingOprTmp->ptNext = ptEncodingOpr;
		ptEncodingOpr->ptNext = NULL;
	}
	return 0;
}

添加支持字库：

初始化时，将文件编码所支持的字库结构体加入编码结构体的字库链表中

int AddFontOprForEncoding(PT_EncodingOpr ptEncodingOpr, PT_FontOpr ptFontOpr)
{

	PT_FontOpr ptFontOprNew;
									
	if(!ptEncodingOpr || !ptFontOpr)
	{
		DBG_PRINT("Error at %s,%d, EncodingOpr(%s),FontOpr(%s)\r\n", __FILE__, __LINE__, ptEncodingOpr->pcName, ptFontOpr->pcName);
		return -1;
	}
	else	
	{
		ptFontOprNew = malloc(sizeof(T_FontOpr));
		if (!ptFontOprNew)
		{
			return -1;
		}
		else
		{
			memcpy(ptFontOprNew, ptFontOpr, sizeof(T_FontOpr));
			ptFontOprNew->ptNext = ptEncodingOpr->ptFontOprSupportHead;
			ptEncodingOpr->ptFontOprSupportHead = ptFontOprNew;
			return 0;
		}		
	}
}

删除无法使用的字库：

根据实际情况（可能没有字库文件），将编码结构体中的一些字库链表节点删除

int DelFontOprFrmEncoding(PT_EncodingOpr ptEncodingOpr, PT_FontOpr ptFontOpr)
{
	PT_FontOpr ptTmp;
	PT_FontOpr ptPre;
		
	if (!ptEncodingOpr || !ptFontOpr)
	{
		return -1;
	}
	
	ptTmp = ptEncodingOpr->ptFontOprSupportHead;
	if (strcmp(ptTmp->pcName, ptFontOpr->pcName) == 0)
	{
		ptEncodingOpr->ptFontOprSupportHead = ptTmp->ptNext;
		free(ptTmp);
		return 0;
	}

	ptPre = ptEncodingOpr->ptFontOprSupportHead;
	ptTmp = ptPre->ptNext;
	while (ptTmp)
	{
		if (strcmp(ptTmp->pcName, ptFontOpr->pcName) == 0)
		{
			ptPre->ptNext = ptTmp->ptNext;
			DBG_PRINT("Del the font %s \r\n",ptTmp->pcName);
			free(ptTmp);
			return 0;
		}
		else
		{
			ptPre = ptTmp;
			ptTmp = ptTmp->ptNext;
		}
	}

	return -1;	
}

选中编码：

解析文件头部的标识符，选中编码

PT_EncodingOpr SelectEncodingOpr(unsigned char *pucBufHead)
{
	PT_EncodingOpr ptEncodingOprTmp = g_ptEncodingOpr;
	
	while(ptEncodingOprTmp)
	{
		if(ptEncodingOprTmp->IsSuppot((char *)pucBufHead))
		{
			DBG_PRINT("select encoding : %s\r\n",ptEncodingOprTmp->pcName);
			return ptEncodingOprTmp;
		}
		ptEncodingOprTmp = ptEncodingOprTmp->ptNext;
	}
	
	return NULL;
}

初始化：

调用各编码的初始化函数

int EncodingsInit(void)
{
	int iError;
	
	iError = AsciiEncodingInit();
	if(iError)
	{
		DBG_PRINT("Error at %s,%d\r\n", __FILE__, __LINE__);
		return -1;
	}
	
	iError = Utf8EncodingInit();
	if(iError)
	{
		DBG_PRINT("Error at %s,%d\r\n", __FILE__, __LINE__);
		return -1;
	}
	
	iError = Utf16leEncodingInit();
	if(iError)
	{
		DBG_PRINT("Error at %s,%d\r\n", __FILE__, __LINE__);
		return -1;
	}
	
	iError = Utf16beEncodingInit();
	if(iError)
	{
		DBG_PRINT("Error at %s,%d\r\n", __FILE__, __LINE__);
		return -1;
	}

	return 0;
}

完整代码：

encoding_manager.h

#ifndef __ENCODING_MANAGER_H
#define __ENCODING_MANAGER_H

#include <fonts_manager.h>


typedef struct EncodingOpr{
	char *pcName;
	
	int   iHeadLen;
	
	PT_FontOpr ptFontOprSupportHead;
	
	int (*IsSuppot)(char *pcBufHead);
	int (*GetCode)(unsigned char *pucBufStart, unsigned char *pucBufEnd, unsigned int *pudwCode);
	
	struct EncodingOpr *ptNext;	
}T_EncodingOpr, *PT_EncodingOpr;



int AsciiEncodingInit(void);
int Utf8EncodingInit(void);
int Utf16leEncodingInit(void);
int Utf16beEncodingInit(void);


int AddFontOprForEncoding(PT_EncodingOpr ptEncodingOpr, PT_FontOpr ptFontOpr);
int DelFontOprFrmEncoding(PT_EncodingOpr ptEncodingOpr, PT_FontOpr ptFontOpr);
int RegisterEncoding(PT_EncodingOpr ptEncodingOpr);
PT_EncodingOpr SelectEncodingOpr(unsigned char *pucBufHead);
int EncodingsInit(void);
void ShowSupportEncoding(void);
void ShowEncodingSupportFont(PT_EncodingOpr ptEncodingOpr);


#endif

encoding_manager.c

#include <config.h>
#include <encoding_manager.h>
#include <fonts_manager.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

PT_EncodingOpr g_ptEncodingOpr;

int AddFontOprForEncoding(PT_EncodingOpr ptEncodingOpr, PT_FontOpr ptFontOpr)
{

	PT_FontOpr ptFontOprNew;
									
	if(!ptEncodingOpr || !ptFontOpr)
	{
		DBG_PRINT("Error at %s,%d, EncodingOpr(%s),FontOpr(%s)\r\n", __FILE__, __LINE__, ptEncodingOpr->pcName, ptFontOpr->pcName);
		return -1;
	}
	else	
	{
		ptFontOprNew = malloc(sizeof(T_FontOpr));
		if (!ptFontOprNew)
		{
			return -1;
		}
		else
		{
			memcpy(ptFontOprNew, ptFontOpr, sizeof(T_FontOpr));
			ptFontOprNew->ptNext = ptEncodingOpr->ptFontOprSupportHead;
			ptEncodingOpr->ptFontOprSupportHead = ptFontOprNew;
			return 0;
		}		
	}
}


int DelFontOprFrmEncoding(PT_EncodingOpr ptEncodingOpr, PT_FontOpr ptFontOpr)
{
	PT_FontOpr ptTmp;
	PT_FontOpr ptPre;
		
	if (!ptEncodingOpr || !ptFontOpr)
	{
		return -1;
	}
	
	ptTmp = ptEncodingOpr->ptFontOprSupportHead;
	if (strcmp(ptTmp->pcName, ptFontOpr->pcName) == 0)
	{
		ptEncodingOpr->ptFontOprSupportHead = ptTmp->ptNext;
		free(ptTmp);
		return 0;
	}

	ptPre = ptEncodingOpr->ptFontOprSupportHead;
	ptTmp = ptPre->ptNext;
	while (ptTmp)
	{
		if (strcmp(ptTmp->pcName, ptFontOpr->pcName) == 0)
		{
			ptPre->ptNext = ptTmp->ptNext;
			DBG_PRINT("Del the font %s \r\n",ptTmp->pcName);
			free(ptTmp);
			return 0;
		}
		else
		{
			ptPre = ptTmp;
			ptTmp = ptTmp->ptNext;
		}
	}

	return -1;	
}

int RegisterEncoding(PT_EncodingOpr ptEncodingOpr)
{
	PT_EncodingOpr ptEncodingOprTmp;
	
	if(!g_ptEncodingOpr)
	{
		g_ptEncodingOpr = ptEncodingOpr;
		g_ptEncodingOpr->ptNext = NULL;
	}
	else
	{
		ptEncodingOprTmp = g_ptEncodingOpr;
		while(ptEncodingOprTmp->ptNext)
		{
			ptEncodingOprTmp = ptEncodingOprTmp->ptNext;
		}
		ptEncodingOprTmp->ptNext = ptEncodingOpr;
		ptEncodingOpr->ptNext = NULL;
	}
	return 0;
}

PT_EncodingOpr SelectEncodingOpr(unsigned char *pucBufHead)
{
	PT_EncodingOpr ptEncodingOprTmp = g_ptEncodingOpr;
	
	while(ptEncodingOprTmp)
	{
		if(ptEncodingOprTmp->IsSuppot((char *)pucBufHead))
		{
			DBG_PRINT("select encoding : %s\r\n",ptEncodingOprTmp->pcName);
			return ptEncodingOprTmp;
		}
		ptEncodingOprTmp = ptEncodingOprTmp->ptNext;
	}
	
	return NULL;
}

int EncodingsInit(void)
{
	int iError;
	
	iError = AsciiEncodingInit();
	if(iError)
	{
		DBG_PRINT("Error at %s,%d\r\n", __FILE__, __LINE__);
		return -1;
	}
	
	iError = Utf8EncodingInit();
	if(iError)
	{
		DBG_PRINT("Error at %s,%d\r\n", __FILE__, __LINE__);
		return -1;
	}
	
	iError = Utf16leEncodingInit();
	if(iError)
	{
		DBG_PRINT("Error at %s,%d\r\n", __FILE__, __LINE__);
		return -1;
	}
	
	iError = Utf16beEncodingInit();
	if(iError)
	{
		DBG_PRINT("Error at %s,%d\r\n", __FILE__, __LINE__);
		return -1;
	}

	return 0;
}

void ShowSupportEncoding(void)
{
	int iCnt = 0;
	PT_EncodingOpr ptEncodingOprTmp = g_ptEncodingOpr;

	printf("\r\n");
	printf("supported encoding:\r\n");

	while(ptEncodingOprTmp)
	{
		printf("%02d : %s\r\n",++iCnt,ptEncodingOprTmp->pcName);
		ptEncodingOprTmp = ptEncodingOprTmp->ptNext;
	}
}