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/**
* @file genpages.c
* @brief generate required font page files
* @author Yunhui Fu (yhfudev@gmail.com)
* @version 1.0
* @date 2015-02-19
* @copyright Yunhui Fu (2015)
*/
#include <stdio.h>
#include <stdint.h> /* uint8_t */
#include <stdlib.h> /* size_t */
#include <string.h>
#include <assert.h>
#include "getline.h"
wchar_t get_val_utf82uni(uint8_t *pstart) {
size_t cntleft;
wchar_t retval = 0;
if (0 == (0x80 & *pstart)) return *pstart;
if (((*pstart & 0xE0) ^ 0xC0) == 0) {
cntleft = 1;
retval = *pstart & ~0xE0;
}
else if (((*pstart & 0xF0) ^ 0xE0) == 0) {
cntleft = 2;
retval = *pstart & ~0xF0;
}
else if (((*pstart & 0xF8) ^ 0xF0) == 0) {
cntleft = 3;
retval = *pstart & ~0xF8;
}
else if (((*pstart & 0xFC) ^ 0xF8) == 0) {
cntleft = 4;
retval = *pstart & ~0xFC;
}
else if (((*pstart & 0xFE) ^ 0xFC) == 0) {
cntleft = 5;
retval = *pstart & ~0xFE;
}
else {
/* encoding error */
cntleft = 0;
retval = 0;
}
pstart++;
for (; cntleft > 0; cntleft --) {
retval <<= 6;
retval |= *pstart & 0x3F;
pstart++;
}
return retval;
}
/**
* @brief 转换 UTF-8 编码的一个字符为本地的 Unicode 字符(wchar_t)
*
* @param pstart : 存储 UTF-8 字符的指针
* @param pval : 需要返回的 Unicode 字符存放地址指针
*
* @return 成功返回下个 UTF-8 字符的位置
*
* 转换 UTF-8 编码的一个字符为本地的 Unicode 字符(wchar_t)
*/
uint8_t* get_utf8_value(uint8_t *pstart, wchar_t *pval) {
uint32_t val = 0;
uint8_t *p = pstart;
/*size_t maxlen = strlen(pstart);*/
assert(NULL != pstart);
#define NEXT_6_BITS() do{ val <<= 6; p++; val |= (*p & 0x3F); }while(0)
if (0 == (0x80 & *p)) {
val = (size_t)*p;
p++;
}
else if (0xC0 == (0xE0 & *p)) {
val = *p & 0x1F;
NEXT_6_BITS();
p++;
assert((wchar_t)val == get_val_utf82uni(pstart));
}
else if (0xE0 == (0xF0 & *p)) {
val = *p & 0x0F;
NEXT_6_BITS();
NEXT_6_BITS();
p++;
assert((wchar_t)val == get_val_utf82uni(pstart));
}
else if (0xF0 == (0xF8 & *p)) {
val = *p & 0x07;
NEXT_6_BITS();
NEXT_6_BITS();
NEXT_6_BITS();
p++;
assert((wchar_t)val == get_val_utf82uni(pstart));
}
else if (0xF8 == (0xFC & *p)) {
val = *p & 0x03;
NEXT_6_BITS();
NEXT_6_BITS();
NEXT_6_BITS();
NEXT_6_BITS();
p++;
assert((wchar_t)val == get_val_utf82uni(pstart));
}
else if (0xFC == (0xFE & *p)) {
val = *p & 0x01;
NEXT_6_BITS();
NEXT_6_BITS();
NEXT_6_BITS();
NEXT_6_BITS();
NEXT_6_BITS();
p++;
assert((wchar_t)val == get_val_utf82uni(pstart));
}
else if (0x80 == (0xC0 & *p)) {
/* error? */
for (; 0x80 == (0xC0 & *p); p++);
}
else {
/* error */
for (; ((0xFE & *p) > 0xFC); p++);
}
/*
if (val == 0) {
p = NULL;
*/
/*
}
else if (pstart + maxlen < p) {
p = pstart;
if (pval) *pval = 0;
}
*/
if (pval) *pval = val;
return p;
}
void usage(char* progname) {
fprintf(stderr, "usage: %s\n", progname);
fprintf(stderr, " read data from stdin\n");
}
void utf8_parse(const char* msg, unsigned int len) {
uint8_t *pend = NULL;
uint8_t *p;
uint8_t *pre;
wchar_t val;
int page;
pend = (uint8_t *)msg + len;
for (pre = (uint8_t *)msg; pre < pend;) {
val = 0;
p = get_utf8_value(pre, &val);
if (NULL == p) break;
page = val / 128;
if (val >= 256) {
fprintf(stdout, "%d %d ", page, (val % 128));
for (; pre < p; pre++) fprintf(stdout, "%c", *pre);
fprintf(stdout, "\n");
}
pre = p;
}
}
int load_file(FILE *fp) {
char * buffer = NULL;
size_t szbuf = 0;
szbuf = 10000;
buffer = (char*)malloc(szbuf);
if (NULL == buffer) return -1;
//pos = ftell (fp);
while (getline( &buffer, &szbuf, fp ) > 0)
utf8_parse((const char*)buffer, (unsigned int)strlen ((char *)buffer));
free(buffer);
return 0;
}
int main(int argc, char * argv[]) {
if (argc > 1) {
usage(argv[0]);
exit(1);
}
load_file(stdin);
}
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