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/* $Id: convert.c 1374 2003-11-27 14:11:40Z victor $ */
#include "bbs.h"
/*
* 只有當 CONVERT 這個 option 開起來時才會用到這些東西。
*
* Main idea
* =========
* 為了達到跟原本 read/write 的 transparency，這邊分別對每種 encoding 定義
* 了他們的 converting function。外界使用時透過 read_wrapper 跟 write_wrapper
* (function pointer)，所以只須把 wrapper 指到 convert.c 中定義的 converting
* function 即可達到目的。
*
* 目前在轉換 encoding 方面，使用了 libhz 這個 library。
*
* Subroutines
* ===========
*
* void set_converting_type(int which);
* 事實上，這邊不希望外界直接 override wrapper 的值。使用這個界面可以設定
* 轉換的 encoding。
*
* which 可以是:
* CONV_NORMAL 不作轉換
* CONV_GB Big5 <-> GB
* CONV_UTF8 Big5 <-> UTF-8
*/
#ifdef CONVERT
extern read_write_type write_type;
extern read_write_type read_type;
unsigned char *gb2big(unsigned char *, int* , int);
unsigned char *big2gb(unsigned char *, int* , int);
unsigned char *utf8_uni(unsigned char *, int *, int);
unsigned char *uni_utf8(unsigned char *, int *, int);
unsigned char *uni2big(unsigned char *, int* , int);
unsigned char *big2uni(unsigned char *, int* , int);
static int gb_read(int fd, void *buf, size_t count)
{
count = read(fd, buf, count);
if (count > 0)
gb2big((char *)buf, &count, 0);
return count;
}
static int gb_write(int fd, void *buf, size_t count)
{
big2gb((char *)buf, &count, 0);
return write(fd, buf, count);
}
static int utf8_read(int fd, void *buf, size_t count)
{
count = read(fd, buf, count);
if (count > 0) {
utf8_uni(buf, &count, 0);
uni2big(buf, &count, 0);
((char *)buf)[count] = 0;
}
return count;
}
static int utf8_write(int fd, void *buf, size_t count)
{
big2uni(buf, &count, 0);
uni_utf8(buf, &count, 0);
((char *)buf)[count] = 0;
return write(fd, buf, count);
}
void set_converting_type(int which)
{
if (which == CONV_NORMAL) {
read_type = read;
write_type = (read_write_type)write;
}
else if (which == CONV_GB) {
read_type = gb_read;
write_type = gb_write;
}
else if (which == CONV_UTF8) {
read_type = utf8_read;
write_type = utf8_write;
}
}
#endif
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