2 Copyright (c) 2005-2015, John Hurst
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6 modification, are permitted provided that the following conditions
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9 notice, this list of conditions and the following disclaimer.
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14 derived from this software without specific prior written permission.
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29 \brief Utility functions
43 // The version number declaration and explanation are in ../configure.ac
44 const char* Version();
46 // a class that represents the string form of a value
47 template <class T, int SIZE = 16>
48 class IntPrinter : public std::string
50 KM_NO_COPY_CONSTRUCT(IntPrinter);
58 IntPrinter(const char* format, T value) {
61 snprintf(m_strbuf, SIZE, m_format, value);
64 inline operator const char*() { return m_strbuf; }
65 inline const char* c_str() { return m_strbuf; }
66 inline const char* set_value(T value) {
67 snprintf(m_strbuf, SIZE, m_format, value);
72 struct i8Printer : public IntPrinter<i8_t> {
73 i8Printer(i8_t value) : IntPrinter<i8_t>("%hd", value) {}
76 struct ui8Printer : public IntPrinter<ui8_t> {
77 ui8Printer(ui8_t value) : IntPrinter<ui8_t>("%hu", value) {}
80 struct i16Printer : public IntPrinter<i16_t> {
81 i16Printer(i16_t value) : IntPrinter<i16_t>("%hd", value) {}
84 struct ui16Printer : public IntPrinter<ui16_t> {
85 ui16Printer(ui16_t value) : IntPrinter<ui16_t>("%hu", value) {}
88 struct i32Printer : public IntPrinter<i32_t> {
89 i32Printer(i32_t value) : IntPrinter<i32_t>("%d", value) {}
92 struct ui32Printer : public IntPrinter<ui32_t> {
93 ui32Printer(ui32_t value) : IntPrinter<ui32_t>("%u", value) {}
97 struct i64Printer : public IntPrinter<i64_t, 32> {
98 i64Printer(i64_t value) : IntPrinter<i64_t, 32>("%I64d", value) {}
101 struct ui64Printer : public IntPrinter<ui64_t, 32> {
102 ui64Printer(ui64_t value) : IntPrinter<ui64_t, 32>("%I64u", value) {}
105 struct i64Printer : public IntPrinter<i64_t, 32> {
106 i64Printer(i64_t value) : IntPrinter<i64_t, 32>("%qd", value) {}
109 struct ui64Printer : public IntPrinter<ui64_t, 32> {
110 ui64Printer(ui64_t value) : IntPrinter<ui64_t, 32>("%qu", value) {}
114 // Convert NULL-terminated UTF-8 hexadecimal string to binary, returns 0 if
115 // the binary buffer was large enough to hold the result. The output parameter
116 // 'char_count' will contain the length of the converted string. If the output
117 // buffer is too small or any of the pointer arguments are NULL, the subroutine
118 // will return -1 and set 'char_count' to the required buffer size. No data will
119 // be written to 'buf' if the subroutine fails.
120 i32_t hex2bin(const char* str, byte_t* buf, ui32_t buf_len, ui32_t* char_count);
122 // Convert a binary string to NULL-terminated UTF-8 hexadecimal, returns the buffer
123 // if the output buffer was large enough to hold the result. If the output buffer
124 // is too small or any of the pointer arguments are NULL, the subroutine will
127 const char* bin2hex(const byte_t* bin_buf, ui32_t bin_len, char* str_buf, ui32_t str_len);
129 const char* bin2UUIDhex(const byte_t* bin_buf, ui32_t bin_len, char* str_buf, ui32_t str_len);
131 // same as above for base64 text
132 i32_t base64decode(const char* str, byte_t* buf, ui32_t buf_len, ui32_t* char_count);
133 const char* base64encode(const byte_t* bin_buf, ui32_t bin_len, char* str_buf, ui32_t str_len);
135 // returns the length of a Base64 encoding of a buffer of the given length
136 inline ui32_t base64_encode_length(ui32_t length) {
137 while ( ( length % 3 ) != 0 )
140 return ( length / 3 ) * 4;
143 // print buffer contents to a stream as hexadecimal values in numbered
144 // rows of 16-bytes each.
146 void hexdump(const byte_t* buf, ui32_t dump_len, FILE* stream = 0);
148 // Return the length in bytes of a BER encoded value
149 inline ui32_t BER_length(const byte_t* buf)
151 if ( buf == 0 || (*buf & 0xf0) != 0x80 )
154 return (*buf & 0x0f) + 1;
157 // Return the BER length required to encode value. A return value of zero
158 // indicates a value too large for this library.
159 ui32_t get_BER_length_for_value(ui64_t valuse);
162 bool read_BER(const byte_t* buf, ui64_t* val);
164 // decode a ber value and compare it to a test value
165 bool read_test_BER(byte_t **buf, ui64_t test_value);
167 // create BER encoding of integer value
168 bool write_BER(byte_t* buf, ui64_t val, ui32_t ber_len = 0);
170 //----------------------------------------------------------------
173 // an abstract base class that objects implement to serialize state
174 // to and from a binary stream.
178 virtual ~IArchive(){}
179 virtual bool HasValue() const = 0;
180 virtual ui32_t ArchiveLength() const = 0;
181 virtual bool Archive(MemIOWriter* Writer) const = 0;
182 virtual bool Unarchive(MemIOReader* Reader) = 0;
187 class ArchivableList : public std::list<T>, public IArchive
191 virtual ~ArchivableList() {}
193 bool HasValue() const { return ! this->empty(); }
195 ui32_t ArchiveLength() const
197 ui32_t arch_size = sizeof(ui32_t);
199 typename ArchivableList<T>::const_iterator i = this->begin();
200 for ( ; i != this->end(); i++ )
201 arch_size += i->ArchiveLength();
206 bool Unarchive(Kumu::MemIOReader* Reader)
208 if ( Reader == 0 ) return false;
209 ui32_t read_size = 0;
210 if ( ! Reader->ReadUi32BE(&read_size) ) return false;
211 for ( ui32_t i = 0; i < read_size; i++ )
214 if ( ! TmpTP.Unarchive(Reader) ) return false;
215 this->push_back(TmpTP);
221 bool Archive(Kumu::MemIOWriter* Writer) const
223 if ( Writer == 0 ) return false;
224 if ( ! Writer->WriteUi32BE(static_cast<ui32_t>(this->size())) ) return false;
225 typename ArchivableList<T>::const_iterator i = this->begin();
226 for ( ; i != this->end(); i++ )
227 if ( ! i->Archive(Writer) ) return false;
233 // archivable version of std::string
236 class ArchivableString : public std::string, public Kumu::IArchive
240 ArchivableString() {}
241 ArchivableString(const char* sz) : std::string(sz) {}
242 ArchivableString(const std::string& s) : std::string(s) {}
243 virtual ~ArchivableString() {}
245 bool HasValue() const { return ! this->empty(); }
246 ui32_t ArchiveLength() const { return sizeof(ui32_t) + static_cast<ui32_t>(this->size()); }
248 bool Archive(MemIOWriter* Writer) const {
249 if ( Writer == 0 ) return false;
250 return Writer->WriteString(*this);
253 bool Unarchive(MemIOReader* Reader) {
254 if ( Reader == 0 ) return false;
255 return Reader->ReadString(*this);
260 class ArchivableUi16 : public Kumu::IArchive
265 ArchivableUi16() : value(0) {}
266 ArchivableUi16(const ui16_t& val) : value(val) {}
267 virtual ~ArchivableUi16() {}
269 bool HasValue() const { return true; }
270 ui32_t ArchiveLength() const { return sizeof(ui16_t); }
272 bool Archive(MemIOWriter* Writer) const {
273 if ( Writer == 0 ) return false;
274 return Writer->WriteUi16BE(value);
277 bool Unarchive(MemIOReader* Reader) {
278 if ( Reader == 0 ) return false;
279 return Reader->ReadUi16BE(&value);
282 const char* EncodeString(char* str_buf, ui32_t buf_len) const {
283 snprintf(str_buf, buf_len, "%hu", value);
289 typedef Kumu::ArchivableList<ArchivableString> StringList;
292 // the base of all identifier classes, Identifier is not usually used directly
293 // see UUID and SymmetricKey below for more detail.
295 template <ui32_t SIZE>
296 class Identifier : public IArchive
300 byte_t m_Value[SIZE];
303 Identifier() : m_HasValue(false) { memset(m_Value, 0, SIZE); }
304 Identifier(const byte_t* value) : m_HasValue(true) { memcpy(m_Value, value, SIZE); }
305 Identifier(const Identifier& rhs) : IArchive() {
306 m_HasValue = rhs.m_HasValue;
307 memcpy(m_Value, rhs.m_Value, SIZE);
310 virtual ~Identifier() {}
312 const Identifier& operator=(const Identifier& rhs) {
313 m_HasValue = rhs.m_HasValue;
314 memcpy(m_Value, rhs.m_Value, SIZE);
318 inline void Set(const byte_t* value) { m_HasValue = true; memcpy(m_Value, value, SIZE); }
319 inline void Reset() { m_HasValue = false; memset(m_Value, 0, SIZE); }
320 inline const byte_t* Value() const { return m_Value; }
321 inline ui32_t Size() const { return SIZE; }
323 inline bool operator<(const Identifier& rhs) const {
324 ui32_t test_size = xmin(rhs.Size(), SIZE);
326 for ( ui32_t i = 0; i < test_size; i++ )
328 if ( m_Value[i] != rhs.m_Value[i] )
329 return m_Value[i] < rhs.m_Value[i];
335 inline bool operator==(const Identifier& rhs) const {
336 if ( rhs.Size() != SIZE ) return false;
337 return ( memcmp(m_Value, rhs.m_Value, SIZE) == 0 );
340 inline bool operator!=(const Identifier& rhs) const {
341 if ( rhs.Size() != SIZE ) return true;
342 return ( memcmp(m_Value, rhs.m_Value, SIZE) != 0 );
345 inline bool DecodeHex(const char* str) {
347 m_HasValue = ( hex2bin(str, m_Value, SIZE, &char_count) == 0 );
348 if ( m_HasValue && char_count != SIZE )
353 inline const char* EncodeHex(char* buf, ui32_t buf_len) const {
354 return bin2hex(m_Value, SIZE, buf, buf_len);
357 inline const char* EncodeString(char* str_buf, ui32_t buf_len) const {
358 return EncodeHex(str_buf, buf_len);
361 inline bool DecodeBase64(const char* str) {
363 m_HasValue = ( base64decode(str, m_Value, SIZE, &char_count) == 0 );
364 if ( m_HasValue && char_count != SIZE )
369 inline const char* EncodeBase64(char* buf, ui32_t buf_len) const {
370 return base64encode(m_Value, SIZE, buf, buf_len);
373 inline bool HasValue() const { return m_HasValue; }
375 inline ui32_t ArchiveLength() const { return SIZE; }
377 inline bool Unarchive(Kumu::MemIOReader* Reader) {
378 m_HasValue = Reader->ReadRaw(m_Value, SIZE);
382 inline bool Archive(Kumu::MemIOWriter* Writer) const {
383 return Writer->WriteRaw(m_Value, SIZE);
390 const ui32_t UUID_Length = 16;
391 class UUID : public Identifier<UUID_Length>
395 UUID(const byte_t* value) : Identifier<UUID_Length>(value) {}
396 UUID(const UUID& rhs) : Identifier<UUID_Length>(rhs) {}
399 inline const char* EncodeString(char* buf, ui32_t buf_len) const {
400 return bin2UUIDhex(m_Value, Size(), buf, buf_len);
403 inline const char* EncodeHex(char* buf, ui32_t buf_len) const {
404 return bin2UUIDhex(m_Value, Size(), buf, buf_len);
408 void GenRandomUUID(byte_t* buf); // buf must be UUID_Length or longer
409 void GenRandomValue(UUID&);
411 typedef ArchivableList<UUID> UUIDList;
413 // a self-wiping key container
415 const ui32_t SymmetricKey_Length = 16;
416 const byte_t NilKey[SymmetricKey_Length] = {
417 0xfa, 0xce, 0xfa, 0xce, 0xfa, 0xce, 0xfa, 0xce,
418 0xfa, 0xce, 0xfa, 0xce, 0xfa, 0xce, 0xfa, 0xce
421 class SymmetricKey : public Identifier<SymmetricKey_Length>
425 SymmetricKey(const byte_t* value) : Identifier<SymmetricKey_Length>(value) {}
426 SymmetricKey(const UUID& rhs) : Identifier<SymmetricKey_Length>(rhs) {}
427 virtual ~SymmetricKey() { memcpy(m_Value, NilKey, 16); m_HasValue = false; }
430 void GenRandomValue(SymmetricKey&);
433 // 2004-05-01T13:20:00+00:00
434 const ui32_t DateTimeLen = 25; // the number of chars in the xs:dateTime format (sans milliseconds)
436 // UTC time+date representation
437 class Timestamp : public IArchive
439 TAI::tai m_Timestamp; // always UTC
440 i32_t m_TZOffsetMinutes;
444 Timestamp(const Timestamp& rhs);
445 Timestamp(const char* datestr);
446 Timestamp(const ui16_t& Year, const ui8_t& Month, const ui8_t& Day);
447 Timestamp(const ui16_t& Year, const ui8_t& Month, const ui8_t& Day,
448 const ui8_t& Hour, const ui8_t& Minute, const ui8_t& Second);
449 virtual ~Timestamp();
451 const Timestamp& operator=(const Timestamp& rhs);
452 bool operator<(const Timestamp& rhs) const;
453 bool operator>(const Timestamp& rhs) const;
454 bool operator==(const Timestamp& rhs) const;
455 bool operator!=(const Timestamp& rhs) const;
458 void GetComponents(ui16_t& Year, ui8_t& Month, ui8_t& Day,
459 ui8_t& Hour, ui8_t& Minute, ui8_t& Second) const;
460 void SetComponents(const ui16_t& Year, const ui8_t& Month, const ui8_t& Day,
461 const ui8_t& Hour, const ui8_t& Minute, const ui8_t& Second);
463 // Write the timestamp value to the given buffer in the form 2004-05-01T13:20:00+00:00
464 // returns 0 if the buffer is smaller than DateTimeLen
465 const char* EncodeString(char* str_buf, ui32_t buf_len) const;
467 // decode and set value from string formatted by EncodeString
468 bool DecodeString(const char* datestr);
470 // Add the given number of days, hours, minutes, or seconds to the timestamp value.
471 // Values less than zero will cause the timestamp to decrease
472 inline void AddDays(const i32_t& d) { m_Timestamp.add_days(d); }
473 inline void AddHours(const i32_t& h) { m_Timestamp.add_hours(h); }
474 inline void AddMinutes(const i32_t& m) { m_Timestamp.add_minutes(m); }
475 inline void AddSeconds(const i32_t& s) { m_Timestamp.add_seconds(s); }
477 // returns false if the requested adjustment is out of range
478 bool SetTZOffsetMinutes(const i32_t& minutes);
479 inline i32_t GetTZOffsetMinutes() const { return m_TZOffsetMinutes; }
481 // Return the number of seconds since the Unix epoch UTC (1970-01-01T00:00:00+00:00)
482 ui64_t GetCTime() const;
484 // Set internal time to the number of seconds since the Unix epoch UTC
485 void SetCTime(const ui64_t& ctime);
487 // Read and write the timestamp (always UTC) value as a byte string having
488 // the following format:
489 // | 16 bits int, big-endian | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits |
490 // | Year A.D | Month(1-12) | Day(1-31) | Hour(0-23) | Minute(0-59) | Second(0-59) |
492 virtual bool HasValue() const;
493 virtual ui32_t ArchiveLength() const { return 8L; }
494 virtual bool Archive(MemIOWriter* Writer) const;
495 virtual bool Unarchive(MemIOReader* Reader);
499 class ByteString : public IArchive
501 KM_NO_COPY_CONSTRUCT(ByteString);
504 byte_t* m_Data; // pointer to memory area containing frame data
505 ui32_t m_Capacity; // size of memory area pointed to by m_Data
506 ui32_t m_Length; // length of byte string in memory area pointed to by m_Data
510 ByteString(ui32_t cap);
511 virtual ~ByteString();
513 // Sets or resets the size of the internally allocated buffer.
514 Result_t Capacity(ui32_t cap);
516 Result_t Append(const ByteString&);
517 Result_t Append(const byte_t* buf, ui32_t buf_len);
519 // returns the size of the buffer
520 inline ui32_t Capacity() const { return m_Capacity; }
522 // returns a const pointer to the essence data
523 inline const byte_t* RoData() const { assert(m_Data); return m_Data; }
525 // returns a non-const pointer to the essence data
526 inline byte_t* Data() { assert(m_Data); return m_Data; }
528 // set the length of the buffer's contents
529 inline ui32_t Length(ui32_t l) { return m_Length = l; }
531 // returns the length of the buffer's contents
532 inline ui32_t Length() const { return m_Length; }
534 // copy the given data into the ByteString, set Length value.
535 // Returns error if the ByteString is too small.
536 Result_t Set(const byte_t* buf, ui32_t buf_len);
537 Result_t Set(const ByteString& Buf);
539 inline virtual bool HasValue() const { return m_Length > 0; }
541 inline virtual ui32_t ArchiveLength() const { return sizeof(ui32_t) + m_Length; }
543 inline virtual bool Archive(MemIOWriter* Writer) const {
545 if ( ! Writer->WriteUi32BE(m_Length) ) return false;
546 if ( ! Writer->WriteRaw(m_Data, m_Length) ) return false;
550 inline virtual bool Unarchive(MemIOReader* Reader) {
553 if ( ! Reader->ReadUi32BE(&tmp_len) ) return false;
554 if ( KM_FAILURE(Capacity(tmp_len)) ) return false;
555 if ( ! Reader->ReadRaw(m_Data, tmp_len) ) return false;
561 inline void hexdump(const ByteString& buf, FILE* stream = 0) {
562 hexdump(buf.RoData(), buf.Length(), stream);
565 // Locates the first occurrence of the null-terminated string s2 in the string s1, where not more
566 // than n characters are searched. Characters that appear after a `\0' character are not searched.
567 // Reproduced here from BSD for portability.
568 const char *km_strnstr(const char *s1, const char *s2, size_t n);
570 // Split the input string into tokens using the given separator. If the separator is not found the
571 // entire string will be returned as a single-item list. Empty items will be recorded for
572 // adjacent instances of the separator. E.g., "/foo//bar/" will return ["", "foo", "", "bar", ""].
573 std::list<std::string> km_token_split(const std::string& str, const std::string& separator);
575 // Join the tokens in the given list using delimiter. If prefix is defined then each token
576 // will be concatenated with the prefix before being added to the composite string.
579 km_join(const T& list, const std::string& delimiter, const std::string& prefix = "")
583 for ( typename T::const_iterator i = list.begin(); i != list.end(); ++i )
585 if ( i != list.begin() )
590 result += prefix + *i;
599 #endif // _KM_UTIL_H_