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Fixed UTF-8 decoding errors leading into infnite loops (#158)

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This commit is contained in:
ocornut 2015-03-08 17:55:56 +00:00
parent 0eeb6228b9
commit 6cd3ed58ce
1 changed files with 21 additions and 17 deletions
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38
imgui.cpp
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@ -7731,6 +7731,7 @@ const ImFont::Glyph* ImFont::FindGlyph(unsigned short c) const
// Convert UTF-8 to 32-bits character, process single character input. // Convert UTF-8 to 32-bits character, process single character input.
// Based on stb_from_utf8() from github.com/nothings/stb/ // Based on stb_from_utf8() from github.com/nothings/stb/
// We handle UTF-8 decoding error by skipping forward.
static int ImTextCharFromUtf8(unsigned int* out_char, const char* in_text, const char* in_text_end) static int ImTextCharFromUtf8(unsigned int* out_char, const char* in_text, const char* in_text_end)
{ {
unsigned int c = (unsigned int)-1; unsigned int c = (unsigned int)-1;
@ -7743,47 +7744,50 @@ static int ImTextCharFromUtf8(unsigned int* out_char, const char* in_text, const
} }
if ((*str & 0xe0) == 0xc0) if ((*str & 0xe0) == 0xc0)
{ {
if (in_text_end && in_text_end - (const char*)str < 2) return -1; *out_char = 0;
if (*str < 0xc2) return -1; if (in_text_end && in_text_end - (const char*)str < 2) return (in_text_end - (const char*)str); // Decode error
if (*str < 0xc2) return 2;
c = (unsigned int)((*str++ & 0x1f) << 6); c = (unsigned int)((*str++ & 0x1f) << 6);
if ((*str & 0xc0) != 0x80) return -1; if ((*str & 0xc0) != 0x80) return 2;
c += (*str++ & 0x3f); c += (*str++ & 0x3f);
*out_char = c; *out_char = c;
return 2; return 2;
} }
if ((*str & 0xf0) == 0xe0) if ((*str & 0xf0) == 0xe0)
{ {
if (in_text_end && in_text_end - (const char*)str < 3) return -1; *out_char = 0;
if (*str == 0xe0 && (str[1] < 0xa0 || str[1] > 0xbf)) return -1; if (in_text_end && in_text_end - (const char*)str < 3) return (in_text_end - (const char*)str); // Decode error
if (*str == 0xed && str[1] > 0x9f) return -1; // str[1] < 0x80 is checked below if (*str == 0xe0 && (str[1] < 0xa0 || str[1] > 0xbf)) return 3;
if (*str == 0xed && str[1] > 0x9f) return 3; // str[1] < 0x80 is checked below
c = (unsigned int)((*str++ & 0x0f) << 12); c = (unsigned int)((*str++ & 0x0f) << 12);
if ((*str & 0xc0) != 0x80) return -1; if ((*str & 0xc0) != 0x80) return 3;
c += (unsigned int)((*str++ & 0x3f) << 6); c += (unsigned int)((*str++ & 0x3f) << 6);
if ((*str & 0xc0) != 0x80) return -1; if ((*str & 0xc0) != 0x80) return 3;
c += (*str++ & 0x3f); c += (*str++ & 0x3f);
*out_char = c; *out_char = c;
return 3; return 3;
} }
if ((*str & 0xf8) == 0xf0) if ((*str & 0xf8) == 0xf0)
{ {
if (in_text_end && in_text_end - (const char*)str < 4) return -1; *out_char = 0;
if (*str > 0xf4) return -1; if (in_text_end && in_text_end - (const char*)str < 4) return (in_text_end - (const char*)str); // Decode error
if (*str == 0xf0 && (str[1] < 0x90 || str[1] > 0xbf)) return -1; if (*str > 0xf4) return 4;
if (*str == 0xf4 && str[1] > 0x8f) return -1; // str[1] < 0x80 is checked below if (*str == 0xf0 && (str[1] < 0x90 || str[1] > 0xbf)) return 4;
if (*str == 0xf4 && str[1] > 0x8f) return 4; // str[1] < 0x80 is checked below
c = (unsigned int)((*str++ & 0x07) << 18); c = (unsigned int)((*str++ & 0x07) << 18);
if ((*str & 0xc0) != 0x80) return -1; if ((*str & 0xc0) != 0x80) return 4;
c += (unsigned int)((*str++ & 0x3f) << 12); c += (unsigned int)((*str++ & 0x3f) << 12);
if ((*str & 0xc0) != 0x80) return -1; if ((*str & 0xc0) != 0x80) return 4;
c += (unsigned int)((*str++ & 0x3f) << 6); c += (unsigned int)((*str++ & 0x3f) << 6);
if ((*str & 0xc0) != 0x80) return -1; if ((*str & 0xc0) != 0x80) return 4;
c += (*str++ & 0x3f); c += (*str++ & 0x3f);
// utf-8 encodings of values used in surrogate pairs are invalid // utf-8 encodings of values used in surrogate pairs are invalid
if ((c & 0xFFFFF800) == 0xD800) return -1; if ((c & 0xFFFFF800) == 0xD800) return 4;
*out_char = c; *out_char = c;
return 4; return 4;
} }
*out_char = 0; *out_char = 0;
return 0; return 1;
} }
static ptrdiff_t ImTextStrFromUtf8(ImWchar* buf, size_t buf_size, const char* in_text, const char* in_text_end) static ptrdiff_t ImTextStrFromUtf8(ImWchar* buf, size_t buf_size, const char* in_text, const char* in_text_end)