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#import "CSFileHandle.h"
#include <sys/stat.h>
NSString *CSCannotOpenFileException=@"CSCannotOpenFileException";
NSString *CSFileErrorException=@"CSFileErrorException";
@implementation CSFileHandle
+(CSFileHandle *)fileHandleForReadingAtPath:(NSString *)path
{ return [self fileHandleForPath:path modes:@"rb"]; }
+(CSFileHandle *)fileHandleForWritingAtPath:(NSString *)path
{ return [self fileHandleForPath:path modes:@"wb"]; }
+(CSFileHandle *)fileHandleForPath:(NSString *)path modes:(NSString *)modes
{
if(!path) return nil;
#if defined(__COCOTRON__) // Cocotron
FILE *fileh=_wfopen([path fileSystemRepresentationW],
(const wchar_t *)[modes cStringUsingEncoding:NSUnicodeStringEncoding]);
#elif defined(__MINGW32__) // GNUstep under mingw32 - sort of untested
FILE *fileh=_wfopen((const wchar_t *)[path fileSystemRepresentation],
(const wchar_t *)[modes cStringUsingEncoding:NSUnicodeStringEncoding]);
#else // Cocoa or GNUstep under Linux
FILE *fileh=fopen([path fileSystemRepresentation],[modes UTF8String]);
#endif
if(!fileh) [NSException raise:CSCannotOpenFileException
format:@"Error attempting to open file \"%@\" in mode \"%@\".",path,modes];
CSFileHandle *handle=[[[CSFileHandle alloc] initWithFilePointer:fileh closeOnDealloc:YES name:path] autorelease];
if(handle) return handle;
fclose(fileh);
return nil;
}
-(id)initWithFilePointer:(FILE *)file closeOnDealloc:(BOOL)closeondealloc name:(NSString *)descname
{
if((self=[super initWithName:descname]))
{
fh=file;
close=closeondealloc;
multilock=nil;
parent=nil;
}
return self;
}
-(id)initAsCopyOf:(CSFileHandle *)other
{
if((self=[super initAsCopyOf:other]))
{
fh=other->fh;
close=NO;
parent=[other retain];
if(!other->multilock) [other _setMultiMode];
multilock=[other->multilock retain];
[multilock lock];
pos=other->pos;
[multilock unlock];
}
return self;
}
-(void)dealloc
{
if(fh&&close) fclose(fh);
[parent release];
[multilock release];
[super dealloc];
}
-(void)close
{
if(fh&&close) fclose(fh);
fh=NULL;
}
-(FILE *)filePointer { return fh; }
-(off_t)fileSize
{
#if defined(__MINGW32__)
struct _stati64 s;
if(_fstati64(fileno(fh),&s)) [self _raiseError];
#else
struct stat s;
if(fstat(fileno(fh),&s)) [self _raiseError];
#endif
return s.st_size;
}
-(off_t)offsetInFile
{
if(multilock) return pos;
else return ftello(fh);
}
-(BOOL)atEndOfFile
{
return [self offsetInFile]==[self fileSize];
/* if(multi) return pos==[self fileSize];
else return feof(fh);*/ // feof() only returns true after trying to read past the end
}
-(void)seekToFileOffset:(off_t)offs
{
if(multilock) { [multilock lock]; }
//if(offs>[self fileSize]) [self _raiseEOF];
if(fseeko(fh,offs,SEEK_SET)) [self _raiseError];
if(multilock) { pos=ftello(fh); [multilock unlock]; }
}
-(void)seekToEndOfFile
{
if(multilock) { [multilock lock]; }
if(fseeko(fh,0,SEEK_END)) [self _raiseError];
if(multilock) { pos=ftello(fh); [multilock unlock]; }
}
-(void)pushBackByte:(int)byte
{
if(multilock) [self _raiseNotSupported:_cmd];
if(ungetc(byte,fh)==EOF) [self _raiseError];
}
-(int)readAtMost:(int)num toBuffer:(void *)buffer
{
if(num==0) return 0;
if(multilock) { [multilock lock]; fseeko(fh,pos,SEEK_SET); }
int n=fread(buffer,1,num,fh);
if(n<=0&&!feof(fh)) [self _raiseError];
if(multilock) { pos=ftello(fh); [multilock unlock]; }
return n;
}
-(void)writeBytes:(int)num fromBuffer:(const void *)buffer
{
if(multilock) { [multilock lock]; fseeko(fh,pos,SEEK_SET); }
if(fwrite(buffer,1,num,fh)!=num) [self _raiseError];
if(multilock) { pos=ftello(fh); [multilock unlock]; }
}
-(void)_raiseError
{
if(feof(fh)) [self _raiseEOF];
else [[[[NSException alloc] initWithName:CSFileErrorException
reason:[NSString stringWithFormat:@"Error while attempting to read file \"%@\": %s.",name,strerror(errno)]
userInfo:[NSDictionary dictionaryWithObject:[NSNumber numberWithInt:errno] forKey:@"ErrNo"]] autorelease] raise];
}
-(void)_setMultiMode
{
if(!multilock)
{
multilock=[NSLock new];
pos=ftello(fh);
}
}
@end
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