From e8701195e66f2d27ffe17fb514eae8173795aaf7 Mon Sep 17 00:00:00 2001
From: Georgiy Bondarenko <69736697+nehilo@users.noreply.github.com>
Date: Thu, 4 Mar 2021 22:54:23 +0500
Subject: Initial commit

---
 buildroot/share/fonts/genpages.c | 193 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 193 insertions(+)
 create mode 100644 buildroot/share/fonts/genpages.c

(limited to 'buildroot/share/fonts/genpages.c')

diff --git a/buildroot/share/fonts/genpages.c b/buildroot/share/fonts/genpages.c
new file mode 100644
index 0000000..c855cea
--- /dev/null
+++ b/buildroot/share/fonts/genpages.c
@@ -0,0 +1,193 @@
+/**
+ * @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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