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      1 /*****************************************************************************/
      2 // Copyright 2006-2007 Adobe Systems Incorporated
      3 // All Rights Reserved.
      4 //
      5 // NOTICE:  Adobe permits you to use, modify, and distribute this file in
      6 // accordance with the terms of the Adobe license agreement accompanying it.
      7 /*****************************************************************************/
      8 
      9 /* $Id: //mondo/dng_sdk_1_4/dng_sdk/source/dng_file_stream.cpp#2 $ */
     10 /* $DateTime: 2012/06/01 07:28:57 $ */
     11 /* $Change: 832715 $ */
     12 /* $Author: tknoll $ */
     13 
     14 /*****************************************************************************/
     15 
     16 #include "dng_file_stream.h"
     17 
     18 #include "dng_exceptions.h"
     19 
     20 /*****************************************************************************/
     21 
     22 dng_file_stream::dng_file_stream (const char *filename,
     23 								  bool output,
     24 								  uint32 bufferSize)
     25 
     26 	:	dng_stream ((dng_abort_sniffer *) NULL,
     27 					bufferSize,
     28 					0)
     29 
     30 	,	fFile (NULL)
     31 
     32 	{
     33 
     34 	fFile = fopen (filename, output ? "wb" : "rb");
     35 
     36 	if (!fFile)
     37 		{
     38 
     39 		#if qDNGValidate
     40 
     41 		ReportError ("Unable to open file",
     42 					 filename);
     43 
     44 		ThrowSilentError ();
     45 
     46 		#else
     47 
     48 		ThrowOpenFile ();
     49 
     50 		#endif
     51 
     52 		}
     53 
     54 	}
     55 
     56 /*****************************************************************************/
     57 
     58 dng_file_stream::~dng_file_stream ()
     59 	{
     60 
     61 	if (fFile)
     62 		{
     63 		fclose (fFile);
     64 		fFile = NULL;
     65 		}
     66 
     67 	}
     68 
     69 /*****************************************************************************/
     70 
     71 uint64 dng_file_stream::DoGetLength ()
     72 	{
     73 
     74 	if (fseek (fFile, 0, SEEK_END) != 0)
     75 		{
     76 
     77 		ThrowReadFile ();
     78 
     79 		}
     80 
     81 	return (uint64) ftell (fFile);
     82 
     83 	}
     84 
     85 /*****************************************************************************/
     86 
     87 void dng_file_stream::DoRead (void *data,
     88 							  uint32 count,
     89 							  uint64 offset)
     90 	{
     91 
     92 	if (fseek (fFile, (long) offset, SEEK_SET) != 0)
     93 		{
     94 
     95 		ThrowReadFile ();
     96 
     97 		}
     98 
     99 	uint32 bytesRead = (uint32) fread (data, 1, count, fFile);
    100 
    101 	if (bytesRead != count)
    102 		{
    103 
    104 		ThrowReadFile ();
    105 
    106 		}
    107 
    108 	}
    109 
    110 /*****************************************************************************/
    111 
    112 void dng_file_stream::DoWrite (const void *data,
    113 							   uint32 count,
    114 							   uint64 offset)
    115 	{
    116 
    117 	if (fseek (fFile, (uint32) offset, SEEK_SET) != 0)
    118 		{
    119 
    120 		ThrowWriteFile ();
    121 
    122 		}
    123 
    124 	uint32 bytesWritten = (uint32) fwrite (data, 1, count, fFile);
    125 
    126 	if (bytesWritten != count)
    127 		{
    128 
    129 		ThrowWriteFile ();
    130 
    131 		}
    132 
    133 	}
    134 
    135 /*****************************************************************************/
    136