unicode moved

1 files changed, 180 insertions, 0 deletions

diff --git a/code/fe310/eos/unicode.c b/code/fe310/eos/unicode.c
new file mode 100644
index 0000000..2915791
--- /dev/null
+++ b/code/fe310/eos/unicode.c
@@ -0,0 +1,180 @@
+#include "unicode.h"
+
+int utf8_enc(utf32_t ch, utf8_t *str) {
+    if (ch <= 0x7f) {
+        str[0] = ch;
+        return 1;
+    } else if (ch <= 0x7ff) {
+        str[0] = 0xc0 | (ch >> 6);
+        str[1] = 0x80 | (ch & 0x3f);
+        return 2;
+    } else if (ch <= 0xffff) {
+        if ((ch >= 0xd800) && (ch <= 0xdfff)) return UTF_ERR;
+        str[0] = 0xe0 | (ch >> 12);
+        str[1] = 0x80 | ((ch >> 6) & 0x3f);
+        str[2] = 0x80 | (ch & 0x3f);
+        return 3;
+    } else if (ch <= 0x10ffff) {
+        str[0] = 0xf0 | (ch >> 18);
+        str[1] = 0x80 | ((ch >> 12) & 0x3f);
+        str[2] = 0x80 | ((ch >> 6) & 0x3f);
+        str[3] = 0x80 | (ch & 0x3f);
+        return 4;
+    } else {
+        return UTF_ERR;
+    }
+}
+
+int utf8_dec(utf8_t *str, utf32_t *ch) {
+    if ((str[0] & 0x80) == 0x00) {
+        *ch = str[0];
+        return 1;
+    } else if ((str[0] & 0xe0) == 0xc0) {
+        if ((str[1] & 0xc0) != 0x80) return UTF_ERR;
+        *ch  = (utf32_t)(str[0] & 0x1f) << 6;
+        *ch |= (utf32_t)(str[1] & 0x3f);
+        if (*ch < 0x80) return UTF_ERR;
+        return 2;
+    } else if ((str[0] & 0xf0) == 0xe0) {
+        if (((str[1] & 0xc0) != 0x80) || ((str[2] & 0xc0) != 0x80)) return UTF_ERR;
+        *ch  = (utf32_t)(str[0] & 0x0f) << 12;
+        *ch |= (utf32_t)(str[1] & 0x3f) << 6;
+        *ch |= (utf32_t)(str[2] & 0x3f);
+        if ((*ch >= 0xd800) && (*ch <= 0xdfff)) return UTF_ERR;
+        if (*ch < 0x800) return UTF_ERR;
+        return 3;
+    } else if ((str[0] & 0xf8) == 0xf0) {
+        if (((str[1] & 0xc0) != 0x80) || ((str[2] & 0xc0) != 0x80) || ((str[3] & 0xc0) != 0x80)) return UTF_ERR;
+        *ch  = (utf32_t)(str[0] & 0x07) << 18;
+        *ch |= (utf32_t)(str[1] & 0x0f) << 12;
+        *ch |= (utf32_t)(str[2] & 0x3f) << 6;
+        *ch |= (utf32_t)(str[3] & 0x3f);
+        if (*ch < 0x010000) return UTF_ERR;
+        if (*ch > 0x10ffff) return UTF_ERR;
+        return 4;
+    } else {
+        return UTF_ERR;
+    }
+}
+
+int utf8_seek(utf8_t *str, int off, utf32_t *ch) {
+    int i;
+    int len = 0;
+
+    if (off < 0) {
+        off = -off;
+        for (i=0; i<off; i++) {
+            len--;
+            while ((str[len] & 0xc0) == 0x80) len--;
+        }
+    } else {
+        for (i=0; i<off; i++) {
+            if ((str[len] & 0x80) == 0x00) {
+                len += 1;
+            } else if ((str[0] & 0xe0) == 0xc0) {
+                len += 2;
+            } else if ((str[0] & 0xf0) == 0xe0) {
+                len += 3;
+            } else if ((str[0] & 0xf8) == 0xf0) {
+                len += 4;
+            }
+        }
+    }
+    utf8_dec(str + len, ch);
+    return len;
+}
+
+int utf8_verify(utf8_t *str, int str_size, int *str_len) {
+    utf32_t ch;
+    uint8_t ch_l;
+    int len = 0;
+
+    while (len < str_size) {
+        if (str_size - len < 4) {
+            if (((str[len] & 0xf8) == 0xf0) ||
+               (((str[len] & 0xf0) == 0xe0) && (str_size - len < 3)) ||
+               (((str[len] & 0xe0) == 0xc0) && (str_size - len < 2))) {
+                   break;
+               }
+        }
+        ch_l = utf8_dec(str + len, &ch);
+        if (ch_l > 0) {
+            if (ch == 0) {
+                *str_len = len;
+                return UTF_OK;
+            }
+            len += ch_l;
+        } else {
+            break;
+        }
+    }
+    *str_len = len;
+    return UTF_ERR;
+}
+
+int utf16_enc(utf32_t ch, uint8_t *str) {
+    if (ch <= 0xffff) {
+        if ((ch >= 0xd800) && (ch <= 0xdfff)) return UTF_ERR;
+        str[0] = ch >> 8;
+        str[1] = ch & 0xff;
+        return 2;
+    } else if (ch <= 0x10ffff) {
+        uint16_t hi;
+        uint16_t lo;
+
+        ch -= 0x10000;
+        hi = (ch >> 10) + 0xd800;
+        lo = (ch & 0x3ff) + 0xdc00;
+        str[0] = hi >> 8;
+        str[1] = hi & 0xff;
+        str[2] = lo >> 8;
+        str[3] = lo & 0xff;
+        return 4;
+    } else {
+        return UTF_ERR;
+    }
+}
+
+int utf16_dec(uint8_t *str, utf32_t *ch) {
+    *ch = (str[0] << 8) | str[1];
+    if ((*ch >= 0xd800) && (*ch <= 0xdfff)) {
+        uint16_t hi = *ch;
+        uint16_t lo;
+
+        if (hi > 0xdbff) return UTF_ERR;
+        lo = (str[2] << 8) | str[3];
+        if ((lo < 0xdc00) || (lo > 0xdfff)) return UTF_ERR;
+        *ch = (((hi - 0xd800) << 10) | (lo - 0xdc00)) + 0x10000;
+        return 4;
+    } else {
+        return 2;
+    }
+}
+
+int utf16_seek(uint8_t *str, int off, utf32_t *ch) {
+    int i;
+    int len = 0;
+    uint16_t cu;
+
+    if (off < 0) {
+        off = -off;
+        for (i=0; i<off; i++) {
+            len -= 2;
+            cu = (str[len] << 8) | str[len + 1];
+            if ((cu >= 0xdc00) && (cu <= 0xdfff)) {
+                len -= 2;
+            }
+        }
+    } else {
+        for (i=0; i<off; i++) {
+            cu = (str[len] << 8) | str[len + 1];
+            if ((cu >= 0xd800) && (cu <= 0xdbff)) {
+                len += 4;
+            } else {
+                len += 2;
+            }
+        }
+    }
+    utf16_dec(str + len, ch);
+    return len;
+}