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XrdCrc32c.cc File Reference
#include <iostream>
#include <fcntl.h>
#include <cstdio>
#include <unistd.h>
#include <sys/stat.h>
#include <cstring>
#include <sys/types.h>
#include <sys/uio.h>
#include "XrdOuc/XrdOucCRC.hh"
#include "XrdSys/XrdSysE2T.hh"
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Macros

#define O_DIRECT   0
 

Functions

void Fatal (const char *op, const char *target)
 
int main (int argc, char *argv[])
 
void Usage (int rc)
 

Macro Definition Documentation

◆ O_DIRECT

#define O_DIRECT   0

Definition at line 51 of file XrdCrc32c.cc.

Function Documentation

◆ Fatal()

void Fatal ( const char *  op,
const char *  target 
)

Definition at line 58 of file XrdCrc32c.cc.

59 {
60 
61 // Generate the message
62 //
63  std::cerr <<"xrdcrc32c: Unable to "<<op<<' '<<target<<"; "<<XrdSysE2T(errno)<<std::endl;
64  exit(3);
65 }
const char * XrdSysE2T(int errcode)
Definition: XrdSysE2T.cc:104

References XrdSysE2T().

Referenced by XrdSecProtocolztn::XrdSecProtocolztn(), XrdOfsTPCAuth::Add(), XrdSecProtocolkrb5::Authenticate(), XrdSecProtocolztn::Authenticate(), XrdOfsTPC::Authorize(), XrdOfsTPC::Death(), XrdOfsTPCAuth::Get(), XrdSecProtocolkrb5::getCredentials(), XrdSecProtocolztn::getCredentials(), XrdSecProtocolkrb5::Init(), main(), XrdOfsTPC::Screen(), XrdTlsContext::SetContextCiphers(), XrdSecProtocolztnInit(), and XrdSecProtocolztnObject().

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◆ main()

int main ( int  argc,
char *  argv[] 
)

Definition at line 91 of file XrdCrc32c.cc.

92 {
93 // extern char *optarg;
94  extern int optind, opterr, optopt;
95  static const int buffSZ = 1024*1024;
96  const char *fPath, *fmt = "%08x";
97  int bytes, fd, opts = O_RDONLY;
98  uint32_t csVal = 0;
99  bool addPath = true, addNL = true;
100  char csBuff[16], c;
101 
102 // Process the options
103 //
104  opterr = 0;
105  if (argc > 1 && '-' == *argv[1])
106  while ((c = getopt(argc,argv,"dhnsx")) && ((unsigned char)c != 0xff))
107  { switch(c)
108  {
109  case 'd': opts |= O_DIRECT;
110  break;
111  case 'h': Usage(0);
112  break;
113  case 'n': addNL = false;
114  break;
115  case 's': addPath = false;
116  break;
117  case 'x': fmt = "%x";
118  break;
119  default: std::cerr <<pgm <<'-' <<char(optopt) <<" option is invalid" <<std::endl;
120  Usage(1);
121  break;
122  }
123  }
124 
125 // Get the source argument
126 //
127  if (optind < argc && strcmp(argv[optind], "-"))
128  {fPath = argv[optind];
129  if ((fd = open(fPath, opts)) < 0) Fatal("open", fPath);
130  } else {
131  fPath = "stdin";
132  fd = STDIN_FILENO;
133  }
134 
135 // Allocate a 1 megabyte page aligned buffer
136 //
137  void *buffP;
138  int rc = posix_memalign(&buffP, sysconf(_SC_PAGESIZE), buffSZ);
139  if (rc) {errno = rc; Fatal("allocate buffer to read", fPath);}
140 
141 // Compute the checksum
142 //
143  while((bytes = read(fd, buffP, buffSZ)) > 0)
144  {csVal = XrdOucCRC::Calc32C(buffP, bytes, csVal);}
145 
146 // Check if we ended with an error
147 //
148  if (bytes < 0) Fatal("read", fPath);
149 
150 // Produce the result
151 //
152  sprintf(csBuff, fmt, csVal);
153  std::cout <<(char *)csBuff;
154  if (addPath) std::cout << ' ' <<fPath;
155  if (addNL) std::cout << std::endl;
156 
157 // All done
158 //
159  free(buffP);
160  return 0;
161 }
void Fatal(const char *op, const char *target)
Definition: XrdCrc32c.cc:58
void Usage(int rc)
Definition: XrdCrc32c.cc:71
#define O_DIRECT
Definition: XrdCrc32c.cc:51
int optopt
int optind
int open(const char *path, int oflag,...)
ssize_t read(int fildes, void *buf, size_t nbyte)
struct myOpts opts
static uint32_t Calc32C(const void *data, size_t count, uint32_t prevcs=0)
Definition: XrdOucCRC.cc:190

References XrdOucCRC::Calc32C(), Fatal(), O_DIRECT, open(), optind, optopt, opts, read(), and Usage().

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◆ Usage()

void Usage ( int  rc)

Definition at line 71 of file XrdCrc32c.cc.

72 {
73  std::cerr <<"\nUsage: xrdcrc32c [opts] [<path> | -]\n"
74  "\n<path> the path to the file whose checksum if to be computed."
75  "\n- compute checksum from data presented at standard in;"
76  "\n example: xrdcp <url> - | xrdcrc32c -\n"
77  "\nopts: -d -h -n -s -x\n"
78  "\n-d read data directly into the buffer, do not use the file cache."
79  "\n-h display usage information (arguments ignored)."
80  "\n-n do not end output with a newline character."
81  "\n-s do not include file path in output result."
82  "\n-x do not print leading zeroes in the checksum, if any."
83  <<std::endl;
84  exit(rc);
85 }

Referenced by main().

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