memory.html

JAVA CARD 开发包规格说明,版本为2.2.2

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<A NAME="MEMORY_TYPE_MIFARE"><!-- --></A><H3>
MEMORY_TYPE_MIFARE</H3>
<PRE>
public static final byte <B>MEMORY_TYPE_MIFARE</B></PRE>
<DL>
<DD>MIFARE<sup>TM</sup> memory type constant. When a <CODE>MemoryAccess</CODE> instance of
 this type is requested, the <CODE>memorySize</CODE> and <CODE>memorySizeOffset</CODE>
 parameters are ignored.<p>
 To use the <CODE>MemoryAccess</CODE> instance the following parameters are applicable :
 <ul> 
 <li><em>auth_key is an 8 byte password, other_len <=16</em>
 <li><em>other_sector = 0, 0<= other_block <= 63</em>
 <li><em>other_block = (%4==3) returns 0 on readData</em>
 <li><em>other_block = 0 returns false on writeData</em>
 </ul>
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<DT><B>See Also:</B><DD><A HREF="../../constant-values.html#javacardx.external.Memory.MEMORY_TYPE_MIFARE">Constant Field Values</A></DL>
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<A NAME="MEMORY_TYPE_EXTENDED_STORE"><!-- --></A><H3>
MEMORY_TYPE_EXTENDED_STORE</H3>
<PRE>
public static final byte <B>MEMORY_TYPE_EXTENDED_STORE</B></PRE>
<DL>
<DD>Extended Memory Store type constant. When a <CODE>MemoryAccess</CODE> instance of
 this type is requested, the <CODE>memorySize</CODE> parameter contains the 32 bit
 number representing the size in bytes of the memory access required and must be
 a positive number less than or equal to <CODE>2,147,483,647 (2^31 - 1)</CODE>.<p>
 <p>To use the <CODE>MemoryAccess</CODE> instance the following parameters are applicable.
 <ul>
 <li><em>auth_key parameter is not required; it is ignored</em>
 <li><em>other_len <= 32767</em>
 <li><em>(other_sector, other_block) concatenated is a 32 bit address</em>
 </ul>
 <p>Note.
 <ul><li><em> To ensure optimal performance on all mass storage memory types
 when accessing different areas of memory, use monotonically increasing
 addresses.</em>
 <li><em>Each time the </em><code>getMemoryAccessInstance</code><em> method is called
 with this memory type parameter, a new memory access object to access a distinct memory chunk
 is returned. A previously obtained memory access object cannot be used to access the
 memory chunk obtained via this new memory access object. The new memory access object
 cannot be used to access the memory chuck accessible via any previously allocated
 memory access object.</em>
 </ul>
<P>
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<DT><B>See Also:</B><DD><A HREF="../../constant-values.html#javacardx.external.Memory.MEMORY_TYPE_EXTENDED_STORE">Constant Field Values</A></DL>
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<A NAME="getMemoryAccessInstance(byte, short[], short)"><!-- --></A><H3>
getMemoryAccessInstance</H3>
<PRE>
public static final <A HREF="../../javacardx/external/MemoryAccess.html" title="interface in javacardx.external">MemoryAccess</A> <B>getMemoryAccessInstance</B>(byte&nbsp;memoryType,
                                                         short[]&nbsp;memorySize,
                                                         short&nbsp;memorySizeOffset)
                                                  throws <A HREF="../../javacardx/external/ExternalException.html" title="class in javacardx.external">ExternalException</A></PRE>
<DL>
<DD>Creates a <code>MemoryAccess</code> object instance for the selected memory subsystem.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>memoryType</CODE> - the desired external memory subsystem. Valid codes listed in
 <CODE>MEMORY_TYPE_*</CODE> constants above, for example 
 <A HREF="../../javacardx/external/Memory.html#MEMORY_TYPE_MIFARE"><CODE>MEMORY_TYPE_MIFARE</CODE></A>.<DD><CODE>memorySize</CODE> - the array containing the desired size in bytes, if applicable,
 in the external memory subsystem. Check
 the descriptions of the MEMORY_TYPE_* constants above for more details.
 The 32 bit number representing the memory size in bytes is formed by concatenating the two
 short values at offset <CODE>memorySizeOffset</CODE> (most significant 16 bits) and
 <CODE>memorySizeOffset+1</CODE> (least significant 16 bits) in this array<DD><CODE>memorySizeOffset</CODE> - the offset within the <CODE>memorySize</CODE> array where the 32 bit
 memory size number in bytes is specified
<DT><B>Returns:</B><DD>the <code>MemoryAccess</code> object instance of the requested memory subsystem
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../javacardx/external/ExternalException.html" title="class in javacardx.external">ExternalException</A></CODE> - with the following reason codes:<ul>
 <li><code>ExternalException.NO_SUCH_SUBSYSTEM</code> if the requested memory subsystem
 is not available.
 <li><code>ExternalException.INVALID_PARAM</code> if the <CODE>memorySize</CODE> parameter is
  invalid.</ul></DL>
</DD>
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