font name UTF8 encoding bug

[Han Chipset]

On Windows, the font name (call function FPDFText_GetFontInfo) in buffer is ANSI (Windows 1252?) encoding, NOT UTF8. For English, UTF8 is the same as ANSI, so there is no problem, but for other languages(such as Chinese), there will be a problem. For example,  for Chinese SimSun this is fine, but Chinese 宋体 will cause a garbled code.

The tested pdf file attached in this post.

// Experimental API.

// Function: FPDFText_GetFontInfo

//          Get the font name and flags of a particular character.

// Parameters:

//          text_page - Handle to a text page information structure.

//                      Returned by FPDFText_LoadPage function.

//          index     - Zero-based index of the character.

//          buffer    - A buffer receiving the font name.

//          buflen    - The length of |buffer| in bytes.

//          flags     - Optional pointer to an int receiving the font flags.

//                      These flags should be interpreted per PDF spec 1.7

//                      Section 5.7.1 Font Descriptor Flags.

// Return value:

//          On success, return the length of the font name, including the

//          trailing NUL character, in bytes. If this length is less than or

//          equal to |length|, |buffer| is set to the font name, |flags| is

//          set to the font flags. |buffer| is in UTF-8 encoding. Return 0 on

//          failure.

FPDF_EXPORT unsigned long FPDF_CALLCONV FPDFText_GetFontInfo(FPDF_TEXTPAGE text_page,   int index,  void* buffer,   unsigned long buflen,    int* flags);

[Lei Zhang]

Thanks for bringing up this issue. Can you file a bug for it at
https://crbug.com/pdfium/new ?

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