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improve jpeg check

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This commit is contained in:
Jinhao 2019-03-09 22:55:37 +08:00
parent 2470848fba
commit f8604c06c8
1 changed files with 11 additions and 6 deletions
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17
source/paint/image.cpp
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@ -1,7 +1,7 @@
/*
* Paint Image Implementation
* Nana C++ Library(http://www.nanapro.org)
* Copyright(C) 2003-2017 Jinhao(cnjinhao@hotmail.com)
* Copyright(C) 2003-2019 Jinhao(cnjinhao@hotmail.com)
*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
@ -225,11 +225,16 @@ namespace paint
else
{
#if defined(NANA_ENABLE_JPEG)
//JFIF
if (bytes > 11 && (0xe0ffd8ff == *reinterpret_cast<const unsigned*>(data)) && 0x4649464A == *reinterpret_cast<const unsigned*>(reinterpret_cast<const char*>(data)+6))
ptr = std::make_shared<detail::image_jpeg>();
else if (bytes > 9 && (0x66697845 == *reinterpret_cast<const unsigned*>(reinterpret_cast<const char*>(data)+6))) //Exif
ptr = std::make_shared<detail::image_jpeg>();
if ((bytes > 11) && (0xd8ff == *reinterpret_cast<const unsigned short*>(data)))
{
switch(*reinterpret_cast<const unsigned*>(reinterpret_cast<const char*>(data)+6))
{
case 0x4649464A: //JFIF
case 0x66697845: //Exif
ptr = std::make_shared<detail::image_jpeg>();
}
}
else
#endif
if ((!ptr) && (bytes > 40))
{