summaryrefslogtreecommitdiff
path: root/tools.h
blob: 3256c352a7ed8cd6ae1bd264682a1ca1e244ff53 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
/*
 * tools.h: Various tools
 *
 * See the main source file 'vdr.c' for copyright information and
 * how to reach the author.
 *
 * $Id: tools.h 1.99 2007/06/15 12:18:37 kls Exp $
 */

#ifndef __TOOLS_H
#define __TOOLS_H

#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <iconv.h>
#include <poll.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <sys/stat.h>
#include <sys/types.h>

typedef unsigned char uchar;

extern int SysLogLevel;

#define esyslog(a...) void( (SysLogLevel > 0) ? syslog_with_tid(LOG_ERR,   a) : void() )
#define isyslog(a...) void( (SysLogLevel > 1) ? syslog_with_tid(LOG_INFO,  a) : void() )
#define dsyslog(a...) void( (SysLogLevel > 2) ? syslog_with_tid(LOG_DEBUG, a) : void() )

#define LOG_ERROR         esyslog("ERROR (%s,%d): %m", __FILE__, __LINE__)
#define LOG_ERROR_STR(s)  esyslog("ERROR: %s: %m", s)

#define SECSINDAY  86400

#define KILOBYTE(n) ((n) * 1024)
#define MEGABYTE(n) ((n) * 1024 * 1024)

#define MALLOC(type, size)  (type *)malloc(sizeof(type) * (size))

#define DELETENULL(p) (delete (p), p = NULL)

#define CHECK(s) { if ((s) < 0) LOG_ERROR; } // used for 'ioctl()' calls
#define FATALERRNO (errno && errno != EAGAIN && errno != EINTR)

#ifndef __STL_CONFIG_H // in case some plugin needs to use the STL
template<class T> inline T min(T a, T b) { return a <= b ? a : b; }
template<class T> inline T max(T a, T b) { return a >= b ? a : b; }
template<class T> inline int sgn(T a) { return a < 0 ? -1 : a > 0 ? 1 : 0; }
template<class T> inline void swap(T &a, T &b) { T t = a; a = b; b = t; }
#endif

void syslog_with_tid(int priority, const char *format, ...) __attribute__ ((format (printf, 2, 3)));

#define BCDCHARTOINT(x) (10 * ((x & 0xF0) >> 4) + (x & 0xF))
int BCD2INT(int x);

// Unfortunately there are no platform independent macros for unaligned
// access. so we do it this way:

template<class T> inline T get_unaligned(T *p)
{
  struct s { T v; } __attribute__((packed));
  return ((s *)p)->v;
}

template<class T> inline void put_unaligned(unsigned int v, T* p)
{
  struct s { T v; } __attribute__((packed));
  ((s *)p)->v = v;
}

// When handling strings that might contain UTF-8 characters, it may be necessary
// to process a "symbol" that consists of several actual character bytes. The
// following functions allow transparently accessing a "char *" string without
// having to worry about what character set is actually used.

int Utf8CharLen(const char *s);
    ///< Returns the number of character bytes at the beginning of the given
    ///< string that form a UTF-8 symbol.
uint Utf8CharGet(const char *s, int Length = 0);
    ///< Returns the UTF-8 symbol at the beginning of the given string.
    ///< Length can be given from a previous call to Utf8CharLen() to avoid calculating
    ///< it again. If no Length is given, Utf8CharLen() will be called.
int Utf8CharSet(uint c, char *s = NULL);
    ///< Converts the given UTF-8 symbol to a sequence of character bytes and copies
    ///< them to the given string. Returns the number of bytes written. If no string
    ///< is given, only the number of bytes is returned and nothing is copied.
int Utf8SymChars(const char *s, int Symbols);
    ///< Returns the number of character bytes at the beginning of the given
    ///< string that form at most the given number of UTF-8 symbols.
int Utf8NumSyms(const char *s);
    ///< Returns the number of UTF-8 symbols formed by the given string of
    ///< character bytes.
int Utf8ToArray(const char *s, uint *a, int Size);
    ///< Converts the given character bytes (including the terminating 0) into an
    ///< array of UTF-8 symbols of the given Size. Returns the number of symbols
    ///< in the array (without the terminating 0).
int Utf8FromArray(const uint *a, char *s, int Size, int Max = -1);
    ///< Converts the given array of UTF-8 symbols (including the terminating 0)
    ///< into a sequence of character bytes of at most Size length. Returns the
    ///< number of character bytes written (without the terminating 0).
    ///< If Max is given, only that many symbols will be converted.
    ///< The resulting string is always zero-terminated if Size is big enough.

// When allocating buffer space, make sure we reserve enough space to hold
// a string in UTF-8 representation:

#define Utf8BufSize(s) ((s) * 4)

// The following macros automatically use the correct versions of the character
// class functions:

#define Utf8to(conv, c) (cCharSetConv::SystemCharacterTable() ? to##conv(c) : tow##conv(c))
#define Utf8is(ccls, c) (cCharSetConv::SystemCharacterTable() ? is##ccls(c) : isw##ccls(c))

class cCharSetConv {
private:
  iconv_t cd;
  char *result;
  size_t length;
  static char *systemCharacterTable;
public:
  cCharSetConv(const char *FromCode = NULL, const char *ToCode = NULL);
     ///< Sets up a character set converter to convert from FromCode to ToCode.
     ///< If FromCode is NULL, the previously set systemCharacterTable is used.
     ///< If ToCode is NULL, "UTF-8" is used.
  ~cCharSetConv();
  const char *Convert(const char *From, char *To = NULL, size_t ToLength = 0);
     ///< Converts the given Text from FromCode to ToCode (as set in the cosntructor).
     ///< If To is given, it is used to copy at most ToLength bytes of the result
     ///< (including the terminating 0) into that buffer. If To is not given,
     ///< the result is copied into a dynamically allocated buffer and is valid as
     ///< long as this object lives, or until the next call to Convert(). The
     ///< return value always points to the result if the conversion was successful
     ///< (even if a fixed size To buffer was given and the result didn't fit into
     ///< it). If the string could not be converted, the result points to the
     ///< original From string.
  static const char *SystemCharacterTable(void) { return systemCharacterTable; }
  static void SetSystemCharacterTable(const char *CharacterTable);
  };

class cString {
private:
  char *s;
public:
  cString(const char *S = NULL, bool TakePointer = false);
  cString(const cString &String);
  virtual ~cString();
  operator const char * () const { return s; } // for use in (const char *) context
  const char * operator*() const { return s; } // for use in (const void *) context (printf() etc.)
  cString &operator=(const cString &String);
  static cString sprintf(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
  };

ssize_t safe_read(int filedes, void *buffer, size_t size);
ssize_t safe_write(int filedes, const void *buffer, size_t size);
void writechar(int filedes, char c);
int WriteAllOrNothing(int fd, const uchar *Data, int Length, int TimeoutMs = 0, int RetryMs = 0);
    ///< Writes either all Data to the given file descriptor, or nothing at all.
    ///< If TimeoutMs is greater than 0, it will only retry for that long, otherwise
    ///< it will retry forever. RetryMs defines the time between two retries.
char *strcpyrealloc(char *dest, const char *src);
char *strn0cpy(char *dest, const char *src, size_t n);
char *strreplace(char *s, char c1, char c2);
char *strreplace(char *s, const char *s1, const char *s2); ///< re-allocates 's' and deletes the original string if necessary!
char *skipspace(const char *s);
char *stripspace(char *s);
char *compactspace(char *s);
cString strescape(const char *s, const char *chars);
bool startswith(const char *s, const char *p);
bool endswith(const char *s, const char *p);
bool isempty(const char *s);
int numdigits(int n);
bool isnumber(const char *s);
cString itoa(int n);
cString AddDirectory(const char *DirName, const char *FileName);
int FreeDiskSpaceMB(const char *Directory, int *UsedMB = NULL);
bool DirectoryOk(const char *DirName, bool LogErrors = false);
bool MakeDirs(const char *FileName, bool IsDirectory = false);
bool RemoveFileOrDir(const char *FileName, bool FollowSymlinks = false);
bool RemoveEmptyDirectories(const char *DirName, bool RemoveThis = false);
int DirSizeMB(const char *DirName); ///< returns the total size of the files in the given directory, or -1 in case of an error
char *ReadLink(const char *FileName); ///< returns a new string allocated on the heap, which the caller must delete (or NULL in case of an error)
bool SpinUpDisk(const char *FileName);
void TouchFile(const char *FileName);
time_t LastModifiedTime(const char *FileName);
cString WeekDayName(int WeekDay);
cString WeekDayName(time_t t);
cString DayDateTime(time_t t = 0);
cString TimeToString(time_t t);
cString DateString(time_t t);
cString TimeString(time_t t);
uchar *RgbToJpeg(uchar *Mem, int Width, int Height, int &Size, int Quality = 100);
    ///< Converts the given Memory to a JPEG image and returns a pointer
    ///< to the resulting image. Mem must point to a data block of exactly
    ///< (Width * Height) triplets of RGB image data bytes. Upon return, Size
    ///< will hold the number of bytes of the resulting JPEG data.
    ///< Quality can be in the range 0..100 and controls the quality of the
    ///< resulting image, where 100 is "best". The caller takes ownership of
    ///< the result and has to delete it once it is no longer needed.
    ///< The result may be NULL in case of an error.

class cBase64Encoder {
private:
  const uchar *data;
  int length;
  int maxResult;
  int i;
  char *result;
  static const char *b64;
public:
  cBase64Encoder(const uchar *Data, int Length, int MaxResult = 64);
      ///< Sets up a new base 64 encoder for the given Data, with the given Length.
      ///< Data will not be copied and must be valid as long as NextLine() will be
      ///< called. MaxResult defines the maximum number of characters in any
      ///< result line. The resulting lines may be shorter than MaxResult in case
      ///< its value is not a multiple of 4.
  ~cBase64Encoder();
  const char *NextLine(void);
      ///< Returns the next line of encoded data (terminated by '\0'), or NULL if
      ///< there is no more encoded data. The caller must call NextLine() and process
      ///< each returned line until NULL is returned, in order to get the entire
      ///< data encoded. The returned data is only valid until the next time NextLine()
      ///< is called, or until the object is destroyed.
  };

class cTimeMs {
private:
  uint64_t begin;
public:
  cTimeMs(int Ms = 0);
      ///< Creates a timer with ms resolution and an initial timeout of Ms.
  static uint64_t Now(void);
  void Set(int Ms = 0);
  bool TimedOut(void);
  uint64_t Elapsed(void);
  };

class cReadLine {
private:
  size_t size;
  char *buffer;
public:
  cReadLine(void);
  ~cReadLine();
  char *Read(FILE *f);
  };

class cPoller {
private:
  enum { MaxPollFiles = 16 };
  pollfd pfd[MaxPollFiles];
  int numFileHandles;
public:
  cPoller(int FileHandle = -1, bool Out = false);
  bool Add(int FileHandle, bool Out);
  bool Poll(int TimeoutMs = 0);
  };

class cReadDir {
private:
  DIR *directory;
  struct dirent *result;
  union { // according to "The GNU C Library Reference Manual"
    struct dirent d;
    char b[offsetof(struct dirent, d_name) + NAME_MAX + 1];
    } u;
public:
  cReadDir(const char *Directory);
  ~cReadDir();
  bool Ok(void) { return directory != NULL; }
  struct dirent *Next(void);
  };

class cFile {
private:
  static bool files[];
  static int maxFiles;
  int f;
public:
  cFile(void);
  ~cFile();
  operator int () { return f; }
  bool Open(const char *FileName, int Flags, mode_t Mode = DEFFILEMODE);
  bool Open(int FileDes);
  void Close(void);
  bool IsOpen(void) { return f >= 0; }
  bool Ready(bool Wait = true);
  static bool AnyFileReady(int FileDes = -1, int TimeoutMs = 1000);
  static bool FileReady(int FileDes, int TimeoutMs = 1000);
  static bool FileReadyForWriting(int FileDes, int TimeoutMs = 1000);
  };

class cSafeFile {
private:
  FILE *f;
  char *fileName;
  char *tempName;
public:
  cSafeFile(const char *FileName);
  ~cSafeFile();
  operator FILE* () { return f; }
  bool Open(void);
  bool Close(void);
  };

/// cUnbufferedFile is used for large files that are mainly written or read
/// in a streaming manner, and thus should not be cached.

class cUnbufferedFile {
private:
  int fd;
  off_t curpos;
  off_t cachedstart;
  off_t cachedend;
  off_t begin;
  off_t lastpos;
  off_t ahead;
  size_t readahead;
  size_t written;
  size_t totwritten;
  int FadviseDrop(off_t Offset, off_t Len);
public:
  cUnbufferedFile(void);
  ~cUnbufferedFile();
  int Open(const char *FileName, int Flags, mode_t Mode = DEFFILEMODE);
  int Close(void);
  void SetReadAhead(size_t ra);
  off_t Seek(off_t Offset, int Whence);
  ssize_t Read(void *Data, size_t Size);
  ssize_t Write(const void *Data, size_t Size);
  static cUnbufferedFile *Create(const char *FileName, int Flags, mode_t Mode = DEFFILEMODE);
  };

class cLockFile {
private:
  char *fileName;
  int f;
public:
  cLockFile(const char *Directory);
  ~cLockFile();
  bool Lock(int WaitSeconds = 0);
  void Unlock(void);
  };

class cListObject {
private:
  cListObject *prev, *next;
public:
  cListObject(void);
  virtual ~cListObject();
  virtual int Compare(const cListObject &ListObject) const { return 0; }
      ///< Must return 0 if this object is equal to ListObject, a positive value
      ///< if it is "greater", and a negative value if it is "smaller".
  void Append(cListObject *Object);
  void Insert(cListObject *Object);
  void Unlink(void);
  int Index(void) const;
  cListObject *Prev(void) const { return prev; }
  cListObject *Next(void) const { return next; }
  };

class cListBase {
protected:
  cListObject *objects, *lastObject;
  cListBase(void);
  int count;
public:
  virtual ~cListBase();
  void Add(cListObject *Object, cListObject *After = NULL);
  void Ins(cListObject *Object, cListObject *Before = NULL);
  void Del(cListObject *Object, bool DeleteObject = true);
  virtual void Move(int From, int To);
  void Move(cListObject *From, cListObject *To);
  virtual void Clear(void);
  cListObject *Get(int Index) const;
  int Count(void) const { return count; }
  void Sort(void);
  };

template<class T> class cList : public cListBase {
public:
  T *Get(int Index) const { return (T *)cListBase::Get(Index); }
  T *First(void) const { return (T *)objects; }
  T *Last(void) const { return (T *)lastObject; }
  T *Prev(const T *object) const { return (T *)object->cListObject::Prev(); } // need to call cListObject's members to
  T *Next(const T *object) const { return (T *)object->cListObject::Next(); } // avoid ambiguities in case of a "list of lists"
  };

template<class T> class cVector {
private:
  mutable int allocated;
  mutable int size;
  mutable T *data;
  void Realloc(int NewAllocated) const { data = (T *)realloc(data, (allocated = NewAllocated) * sizeof(T)); }
public:
  cVector(int Allocated = 10)
  {
    allocated = 0;
    size = 0;
    data = NULL;
    Realloc(Allocated);
  }
  virtual ~cVector() { free(data); }
  T& At(int Index) const
  {
    if (Index >= size)
       Realloc(size = Index + 1);
    return data[Index];
  }
  const T& operator[](int Index) const
  {
    return At(Index);
  }
  T& operator[](int Index)
  {
    return At(Index);
  }
  int Size(void) const { return size; }
  virtual void Append(T Data)
  {
    if (size >= allocated)
       Realloc(allocated * 4 / 2); // increase size by 50%
    data[size++] = Data;
  }
  void Sort(__compar_fn_t Compare)
  {
    qsort(data, size, sizeof(T), Compare);
  }
  };

inline int CompareStrings(const void *a, const void *b)
{
  return strcmp(*(const char **)a, *(const char **)b);
}

class cFileNameList : public cVector<char *> {
public:
  cFileNameList(const char *Directory = NULL);
  virtual ~cFileNameList();
  bool Load(const char *Directory);
  int Find(const char *FileName);
  };

class cHashObject : public cListObject {
  friend class cHashBase;
private:
  unsigned int id;
  cListObject *object;
public:
  cHashObject(cListObject *Object, unsigned int Id) { object = Object; id = Id; }
  cListObject *Object(void) { return object; }
  };

class cHashBase {
private:
  cList<cHashObject> **hashTable;
  int size;
  unsigned int hashfn(unsigned int Id) const { return Id % size; }
protected:
  cHashBase(int Size);
public:
  virtual ~cHashBase();
  void Add(cListObject *Object, unsigned int Id);
  void Del(cListObject *Object, unsigned int Id);
  void Clear(void);
  cListObject *Get(unsigned int Id) const;
  cList<cHashObject> *GetList(unsigned int Id) const;
  };

#define HASHSIZE 512

template<class T> class cHash : public cHashBase {
public:
  cHash(int Size = HASHSIZE) : cHashBase(Size) {}
  T *Get(unsigned int Id) const { return (T *)cHashBase::Get(Id); }
};

#endif //__TOOLS_H