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

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This commit is contained in:
kevin 2013-02-15 15:59:10 -08:00
parent 9b9e626287
commit 79eb363343
2 changed files with 63 additions and 0 deletions
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59
cmFile.c
View File

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

4
cmFile.h
View File

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