|| || || || || || || ||

---

ReadImage.h

Go to the documentation of this file.

#ifndef Impala_Core_Array_ReadImage_h
#define Impala_Core_Array_ReadImage_h

#include "Core/Array/Arrays.h"
#include "Core/Array/ReadPng.h"
#include "Core/Array/ReadJpg.h"

namespace Impala
{
namespace Core
{
namespace Array
{


template <class ArrayT>
inline void
ReadImageFromMemory(ArrayT*& dst, char *buf, int bufsize)
{
    ILOG_VAR(Impala.Core.Array.ReadImageFromMemory);
    if (bufsize < 14)
    {
        ILOG_ERROR("Buffer size too small to identify file: " << bufsize
                   << " bytes");
        return;
    }

    // PNG image (first 8 bytes are always the same)
    if (((buf[0] == -119) || (buf[0] == 137)) &&        // 0x89 (signed stuff is... annoying)
        (buf[1] == 0x50) &&
        (buf[2] == 0x4e) &&
        (buf[3] == 0x47) &&
        (buf[4] == 0x0d) &&
        (buf[5] == 0x0a) &&
        (buf[6] == 0x1a) &&
        (buf[7] == 0x0a))
    {
        ReadPngFromMemory(dst, buf, bufsize);
        return;
    }

    // ordinary JFIF JPEG
    if ((buf[0] == -1) &&      // 0xff
        (buf[1] == -40) &&     // 0xd8
        (buf[2] == -1) &&      // 0xff application marker
        //(buf[3] == 0xe0) &&  // application marker
        //                     // (this part can be e0..ef or anything?)
        (buf[6] == 0x4a) &&    // J
        (buf[7] == 0x46) &&    // F
        (buf[8] == 0x49) &&    // I
        (buf[9] == 0x46) &&    // F
        (buf[10] == 0x00))
    {
        ReadJpgFromMemory(dst, buf, bufsize);
        return;
    }

    // Exif JPEG ...not tested...
    //is the "Exif" part required to be in this exact location?
    if ((buf[0] == -1) &&       // 0xff
        (buf[1] == -40) &&      // 0xd8
        (buf[2] == -1) &&       // 0xff application marker
        (buf[3] == -31) &&      // 0xe1 application marker
                                // (this part has to be e1 for exif)
        (buf[8] == 0x45) &&     // E
        (buf[9] == 0x78) &&     // x
        (buf[10] == 0x69) &&    // i
        (buf[11] == 0x66) &&    // f
        (buf[12] == 0x00) &&    // \0
        (buf[13] == 0x00))      // \0
    {
        ReadJpgFromMemory(dst, buf, bufsize);
        return;
    }
    // Exif JPEG 2nd form: Exif 2 bytes back
    //is the "Exif" part required to be in this exact location?
    if ((buf[0] == -1) &&       // 0xff
        (buf[1] == -40) &&      // 0xd8
        (buf[2] == -1) &&       // 0xff application marker
        (buf[3] == -31) &&      // 0xe1 application marker
                                // (this part has to be e1 for exif)
        (buf[6] == 0x45) &&     // E
        (buf[7] == 0x78) &&     // x
        (buf[8] == 0x69) &&     // i
        (buf[9] == 0x66) &&     // f
        (buf[10] == 0x00) &&    // \0
        (buf[11] == 0x00))      // \0
    {
        ReadJpgFromMemory(dst, buf, bufsize);
        return;
    }


    ILOG_ERROR("Unknown image file format! " << int(buf[0]) << " " <<
               int(buf[1]) << " " << int(buf[2]) << " " << int(buf[3]) << " "
               << int(buf[4]) << " " << int(buf[5]) << " " << int(buf[6]) <<
               " " << int(buf[7]) << " " << int(buf[8]) << " " << int(buf[9])
               << " " << int(buf[10]) << " " << int(buf[11]));
}

} // namespace Array
} // namespace Core
} // namespace Impala

#endif

---