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cmFile.h/c Added cmFileByteCountFn(), cmFileCompare().

master
kevin 11 лет назад
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79eb363343
2 измененных файлов: 63 добавлений и 0 удалений
  1. 59
    0
      cmFile.c
  2. 4
    0
      cmFile.h

+ 59
- 0
cmFile.c Просмотреть файл

@@ -193,6 +193,65 @@ unsigned   cmFileByteCount(  cmFileH_t h )
193 193
   return sr.st_size;
194 194
 }
195 195
 
196
+cmFileRC_t   cmFileByteCountFn( const cmChar_t* fn, cmRpt_t* rpt, unsigned* fileByteCntPtr )
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+{
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+  assert( fileByteCntPtr != NULL );
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+  cmFileRC_t rc;
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+  cmFileH_t h = cmFileNullHandle;
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+  if((rc = cmFileOpen(&h,fn,kReadFileFl,rpt)) != kOkFileRC )
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+    return rc;
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+
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+  if( fileByteCntPtr != NULL)
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+    *fileByteCntPtr = cmFileByteCount(h);
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+
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+  cmFileClose(&h);
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+
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+  return rc;    
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+}
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+
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+cmFileRC_t cmFileCompare( const cmChar_t* fn0, const cmChar_t* fn1, cmRpt_t* rpt, bool* isEqualPtr )
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+{
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+  cmFileRC_t rc         = kOkFileRC;
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+  unsigned   bufByteCnt = 2048;
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+  cmFileH_t  h0         = cmFileNullHandle;
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+  cmFileH_t  h1         = cmFileNullHandle;
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+
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+  char       b0[ bufByteCnt ];
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+  char       b1[ bufByteCnt ];
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+
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+  assert(isEqualPtr != NULL );
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+  *isEqualPtr = true;
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+
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+  if((rc = cmFileOpen(&h0,fn0,kReadFileFl,rpt)) != kOkFileRC )
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+    goto errLabel;
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+
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+  if((rc = cmFileOpen(&h1,fn1,kReadFileFl,rpt)) != kOkFileRC )
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+    goto errLabel;
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+
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+  cmFile_t*   p0 = _cmFileHandleToPtr(h0);
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+  cmFile_t*   p1 = _cmFileHandleToPtr(h1);
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+
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+  while(1)
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+  {
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+    size_t n0 = fread(b0,1,bufByteCnt,p0->fp);
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+    size_t n1 = fread(b1,1,bufByteCnt,p1->fp);
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+    if( n0 != n1 || memcmp(b0,b1,n0)!=0 )
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+    {
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+      *isEqualPtr = false;
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+      break;
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+    }
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+
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+    if( n0 != bufByteCnt || n1 != bufByteCnt )
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+      break;
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+  }
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+
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+ errLabel:
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+  cmFileClose(&h0);
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+  cmFileClose(&h1);
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+  return rc;
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+}
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+
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+
196 255
 const cmChar_t* cmFileName( cmFileH_t h )
197 256
 {
198 257
   cmFile_t* p = _cmFileHandleToPtr(h);

+ 4
- 0
cmFile.h Просмотреть файл

@@ -89,6 +89,10 @@ extern "C" {
89 89
 
90 90
   // Return the length of the file in bytes
91 91
   unsigned   cmFileByteCount(  cmFileH_t h );
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+  cmFileRC_t cmFileByteCountFn( const cmChar_t* fn, cmRpt_t* rpt, unsigned* fileByteCntPtr );
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+
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+  // Set *isEqualPtr=true if the two files are identical.
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+  cmFileRC_t cmFileCompare( const cmChar_t* fn0, const cmChar_t* fn1, cmRpt_t* rpt, bool* isEqualFlPtr );
92 96
 
93 97
   // Return the file name associated with a file handle.
94 98
   const cmChar_t* cmFileName( cmFileH_t h );

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