fix incompatible function type
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@ -42,7 +42,7 @@ void user_error_fn( png_structp png_ptr, png_const_charp error_msg ){
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longjmp( png_jmpbuf(png_ptr), 0 );
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}
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void user_read_data( png_structp png_ptr, png_bytep data, png_uint_32 length ){
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void user_read_data( png_structp png_ptr, png_bytep data, size_t length ){
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png_bytep *p_p_fbuffer = (png_bytep*)png_get_io_ptr( png_ptr );
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memcpy( data, *p_p_fbuffer, length );
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*p_p_fbuffer += length;
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