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+/************************************************************************************
+
+PublicHeader: OVR.h
+Filename : OVR_String.h
+Content : String UTF8 string implementation with copy-on-write semantics
+ (thread-safe for assignment but not modification).
+Created : September 19, 2012
+Notes :
+
+Copyright : Copyright 2014 Oculus VR, Inc. All Rights reserved.
+
+Licensed under the Oculus VR Rift SDK License Version 3.1 (the "License");
+you may not use the Oculus VR Rift SDK except in compliance with the License,
+which is provided at the time of installation or download, or which
+otherwise accompanies this software in either electronic or hard copy form.
+
+You may obtain a copy of the License at
+
+http://www.oculusvr.com/licenses/LICENSE-3.1
+
+Unless required by applicable law or agreed to in writing, the Oculus VR SDK
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+************************************************************************************/
+
+#ifndef OVR_String_h
+#define OVR_String_h
+
+#include "OVR_Types.h"
+#include "OVR_Allocator.h"
+#include "OVR_UTF8Util.h"
+#include "OVR_Atomic.h"
+#include "OVR_Std.h"
+#include "OVR_Alg.h"
+
+namespace OVR {
+
+// ***** Classes
+
+class String;
+class StringBuffer;
+
+
+//-----------------------------------------------------------------------------------
+// ***** String Class
+
+// String is UTF8 based string class with copy-on-write implementation
+// for assignment.
+
+class String
+{
+protected:
+
+ enum FlagConstants
+ {
+ //Flag_GetLength = 0x7FFFFFFF,
+ // This flag is set if GetLength() == GetSize() for a string.
+ // Avoid extra scanning is Substring and indexing logic.
+ Flag_LengthIsSizeShift = (sizeof(UPInt)*8 - 1)
+ };
+
+
+ // Internal structure to hold string data
+ struct DataDesc
+ {
+ // Number of bytes. Will be the same as the number of chars if the characters
+ // are ascii, may not be equal to number of chars in case string data is UTF8.
+ UPInt Size;
+ volatile SInt32 RefCount;
+ char Data[1];
+
+ void AddRef()
+ {
+ AtomicOps<SInt32>::ExchangeAdd_NoSync(&RefCount, 1);
+ }
+ // Decrement ref count. This needs to be thread-safe, since
+ // a different thread could have also decremented the ref count.
+ // For example, if u start off with a ref count = 2. Now if u
+ // decrement the ref count and check against 0 in different
+ // statements, a different thread can also decrement the ref count
+ // in between our decrement and checking against 0 and will find
+ // the ref count = 0 and delete the object. This will lead to a crash
+ // when context switches to our thread and we'll be trying to delete
+ // an already deleted object. Hence decrementing the ref count and
+ // checking against 0 needs to made an atomic operation.
+ void Release()
+ {
+ if ((AtomicOps<SInt32>::ExchangeAdd_NoSync(&RefCount, -1) - 1) == 0)
+ OVR_FREE(this);
+ }
+
+ static UPInt GetLengthFlagBit() { return UPInt(1) << Flag_LengthIsSizeShift; }
+ UPInt GetSize() const { return Size & ~GetLengthFlagBit() ; }
+ UPInt GetLengthFlag() const { return Size & GetLengthFlagBit(); }
+ bool LengthIsSize() const { return GetLengthFlag() != 0; }
+ };
+
+ // Heap type of the string is encoded in the lower bits.
+ enum HeapType
+ {
+ HT_Global = 0, // Heap is global.
+ HT_Local = 1, // SF::String_loc: Heap is determined based on string's address.
+ HT_Dynamic = 2, // SF::String_temp: Heap is stored as a part of the class.
+ HT_Mask = 3
+ };
+
+ union {
+ DataDesc* pData;
+ UPInt HeapTypeBits;
+ };
+ typedef union {
+ DataDesc* pData;
+ UPInt HeapTypeBits;
+ } DataDescUnion;
+
+ inline HeapType GetHeapType() const { return (HeapType) (HeapTypeBits & HT_Mask); }
+
+ inline DataDesc* GetData() const
+ {
+ DataDescUnion u;
+ u.pData = pData;
+ u.HeapTypeBits = (u.HeapTypeBits & ~(UPInt)HT_Mask);
+ return u.pData;
+ }
+
+ inline void SetData(DataDesc* pdesc)
+ {
+ HeapType ht = GetHeapType();
+ pData = pdesc;
+ OVR_ASSERT((HeapTypeBits & HT_Mask) == 0);
+ HeapTypeBits |= ht;
+ }
+
+
+ DataDesc* AllocData(UPInt size, UPInt lengthIsSize);
+ DataDesc* AllocDataCopy1(UPInt size, UPInt lengthIsSize,
+ const char* pdata, UPInt copySize);
+ DataDesc* AllocDataCopy2(UPInt size, UPInt lengthIsSize,
+ const char* pdata1, UPInt copySize1,
+ const char* pdata2, UPInt copySize2);
+
+ // Special constructor to avoid data initalization when used in derived class.
+ struct NoConstructor { };
+ String(const NoConstructor&) { }
+
+public:
+
+ // For initializing string with dynamic buffer
+ struct InitStruct
+ {
+ virtual ~InitStruct() { }
+ virtual void InitString(char* pbuffer, UPInt size) const = 0;
+ };
+
+
+ // Constructors / Destructors.
+ String();
+ String(const char* data);
+ String(const char* data1, const char* pdata2, const char* pdata3 = 0);
+ String(const char* data, UPInt buflen);
+ String(const String& src);
+ String(const StringBuffer& src);
+ String(const InitStruct& src, UPInt size);
+ explicit String(const wchar_t* data);
+
+ // Destructor (Captain Obvious guarantees!)
+ ~String()
+ {
+ GetData()->Release();
+ }
+
+ // Declaration of NullString
+ static DataDesc NullData;
+
+
+ // *** General Functions
+
+ void Clear();
+
+ // For casting to a pointer to char.
+ operator const char*() const { return GetData()->Data; }
+ // Pointer to raw buffer.
+ const char* ToCStr() const { return GetData()->Data; }
+
+ // Returns number of bytes
+ UPInt GetSize() const { return GetData()->GetSize() ; }
+ // Tells whether or not the string is empty
+ bool IsEmpty() const { return GetSize() == 0; }
+
+ // Returns number of characters
+ UPInt GetLength() const;
+
+ // Returns character at the specified index
+ UInt32 GetCharAt(UPInt index) const;
+ UInt32 GetFirstCharAt(UPInt index, const char** offset) const;
+ UInt32 GetNextChar(const char** offset) const;
+
+ // Appends a character
+ void AppendChar(UInt32 ch);
+
+ // Append a string
+ void AppendString(const wchar_t* pstr, SPInt len = -1);
+ void AppendString(const char* putf8str, SPInt utf8StrSz = -1);
+
+ // Assigned a string with dynamic data (copied through initializer).
+ void AssignString(const InitStruct& src, UPInt size);
+ // Assigns string with known size.
+ void AssignString(const char* putf8str, UPInt size);
+
+ // Resize the string to the new size
+// void Resize(UPInt _size);
+
+ // Removes the character at posAt
+ void Remove(UPInt posAt, SPInt len = 1);
+
+ // Returns a String that's a substring of this.
+ // -start is the index of the first UTF8 character you want to include.
+ // -end is the index one past the last UTF8 character you want to include.
+ String Substring(UPInt start, UPInt end) const;
+
+ // Case-conversion
+ String ToUpper() const;
+ String ToLower() const;
+
+ // Inserts substr at posAt
+ String& Insert (const char* substr, UPInt posAt, SPInt len = -1);
+
+ // Inserts character at posAt
+ UPInt InsertCharAt(UInt32 c, UPInt posAt);
+
+ // Inserts substr at posAt, which is an index of a character (not byte).
+ // Of size is specified, it is in bytes.
+// String& Insert(const UInt32* substr, UPInt posAt, SPInt size = -1);
+
+ // Get Byte index of the character at position = index
+ UPInt GetByteIndex(UPInt index) const { return (UPInt)UTF8Util::GetByteIndex(index, GetData()->Data); }
+
+ // Utility: case-insensitive string compare. stricmp() & strnicmp() are not
+ // ANSI or POSIX, do not seem to appear in Linux.
+ static int OVR_STDCALL CompareNoCase(const char* a, const char* b);
+ static int OVR_STDCALL CompareNoCase(const char* a, const char* b, SPInt len);
+
+ // Hash function, case-insensitive
+ static UPInt OVR_STDCALL BernsteinHashFunctionCIS(const void* pdataIn, UPInt size, UPInt seed = 5381);
+
+ // Hash function, case-sensitive
+ static UPInt OVR_STDCALL BernsteinHashFunction(const void* pdataIn, UPInt size, UPInt seed = 5381);
+
+
+ // ***** File path parsing helper functions.
+ // Implemented in OVR_String_FilePath.cpp.
+
+ // Absolute paths can star with:
+ // - protocols: 'file://', 'http://'
+ // - windows drive: 'c:\'
+ // - UNC share name: '\\share'
+ // - unix root '/'
+ static bool HasAbsolutePath(const char* path);
+ static bool HasExtension(const char* path);
+ static bool HasProtocol(const char* path);
+
+ bool HasAbsolutePath() const { return HasAbsolutePath(ToCStr()); }
+ bool HasExtension() const { return HasExtension(ToCStr()); }
+ bool HasProtocol() const { return HasProtocol(ToCStr()); }
+
+ String GetProtocol() const; // Returns protocol, if any, with trailing '://'.
+ String GetPath() const; // Returns path with trailing '/'.
+ String GetFilename() const; // Returns filename, including extension.
+ String GetExtension() const; // Returns extension with a dot.
+
+ void StripProtocol(); // Strips front protocol, if any, from the string.
+ void StripExtension(); // Strips off trailing extension.
+
+
+ // Operators
+ // Assignment
+ void operator = (const char* str);
+ void operator = (const wchar_t* str);
+ void operator = (const String& src);
+ void operator = (const StringBuffer& src);
+
+ // Addition
+ void operator += (const String& src);
+ void operator += (const char* psrc) { AppendString(psrc); }
+ void operator += (const wchar_t* psrc) { AppendString(psrc); }
+ void operator += (char ch) { AppendChar(ch); }
+ String operator + (const char* str) const;
+ String operator + (const String& src) const;
+
+ // Comparison
+ bool operator == (const String& str) const
+ {
+ return (OVR_strcmp(GetData()->Data, str.GetData()->Data)== 0);
+ }
+
+ bool operator != (const String& str) const
+ {
+ return !operator == (str);
+ }
+
+ bool operator == (const char* str) const
+ {
+ return OVR_strcmp(GetData()->Data, str) == 0;
+ }
+
+ bool operator != (const char* str) const
+ {
+ return !operator == (str);
+ }
+
+ bool operator < (const char* pstr) const
+ {
+ return OVR_strcmp(GetData()->Data, pstr) < 0;
+ }
+
+ bool operator < (const String& str) const
+ {
+ return *this < str.GetData()->Data;
+ }
+
+ bool operator > (const char* pstr) const
+ {
+ return OVR_strcmp(GetData()->Data, pstr) > 0;
+ }
+
+ bool operator > (const String& str) const
+ {
+ return *this > str.GetData()->Data;
+ }
+
+ int CompareNoCase(const char* pstr) const
+ {
+ return CompareNoCase(GetData()->Data, pstr);
+ }
+ int CompareNoCase(const String& str) const
+ {
+ return CompareNoCase(GetData()->Data, str.ToCStr());
+ }
+
+ // Accesses raw bytes
+ const char& operator [] (int index) const
+ {
+ OVR_ASSERT(index >= 0 && (UPInt)index < GetSize());
+ return GetData()->Data[index];
+ }
+ const char& operator [] (UPInt index) const
+ {
+ OVR_ASSERT(index < GetSize());
+ return GetData()->Data[index];
+ }
+
+
+ // Case insensitive keys are used to look up insensitive string in hash tables
+ // for SWF files with version before SWF 7.
+ struct NoCaseKey
+ {
+ const String* pStr;
+ NoCaseKey(const String &str) : pStr(&str){};
+ };
+
+ bool operator == (const NoCaseKey& strKey) const
+ {
+ return (CompareNoCase(ToCStr(), strKey.pStr->ToCStr()) == 0);
+ }
+ bool operator != (const NoCaseKey& strKey) const
+ {
+ return !(CompareNoCase(ToCStr(), strKey.pStr->ToCStr()) == 0);
+ }
+
+ // Hash functor used for strings.
+ struct HashFunctor
+ {
+ UPInt operator()(const String& data) const
+ {
+ UPInt size = data.GetSize();
+ return String::BernsteinHashFunction((const char*)data, size);
+ }
+ };
+ // Case-insensitive hash functor used for strings. Supports additional
+ // lookup based on NoCaseKey.
+ struct NoCaseHashFunctor
+ {
+ UPInt operator()(const String& data) const
+ {
+ UPInt size = data.GetSize();
+ return String::BernsteinHashFunctionCIS((const char*)data, size);
+ }
+ UPInt operator()(const NoCaseKey& data) const
+ {
+ UPInt size = data.pStr->GetSize();
+ return String::BernsteinHashFunctionCIS((const char*)data.pStr->ToCStr(), size);
+ }
+ };
+
+};
+
+
+//-----------------------------------------------------------------------------------
+// ***** String Buffer used for Building Strings
+
+class StringBuffer
+{
+ char* pData;
+ UPInt Size;
+ UPInt BufferSize;
+ UPInt GrowSize;
+ mutable bool LengthIsSize;
+
+public:
+
+ // Constructors / Destructor.
+ StringBuffer();
+ explicit StringBuffer(UPInt growSize);
+ StringBuffer(const char* data);
+ StringBuffer(const char* data, UPInt buflen);
+ StringBuffer(const String& src);
+ StringBuffer(const StringBuffer& src);
+ explicit StringBuffer(const wchar_t* data);
+ ~StringBuffer();
+
+
+ // Modify grow size used for growing/shrinking the buffer.
+ UPInt GetGrowSize() const { return GrowSize; }
+ void SetGrowSize(UPInt growSize);
+
+
+ // *** General Functions
+ // Does not release memory, just sets Size to 0
+ void Clear();
+
+ // For casting to a pointer to char.
+ operator const char*() const { return (pData) ? pData : ""; }
+ // Pointer to raw buffer.
+ const char* ToCStr() const { return (pData) ? pData : ""; }
+
+ // Returns number of bytes.
+ UPInt GetSize() const { return Size ; }
+ // Tells whether or not the string is empty.
+ bool IsEmpty() const { return GetSize() == 0; }
+
+ // Returns number of characters
+ UPInt GetLength() const;
+
+ // Returns character at the specified index
+ UInt32 GetCharAt(UPInt index) const;
+ UInt32 GetFirstCharAt(UPInt index, const char** offset) const;
+ UInt32 GetNextChar(const char** offset) const;
+
+
+ // Resize the string to the new size
+ void Resize(UPInt _size);
+ void Reserve(UPInt _size);
+
+ // Appends a character
+ void AppendChar(UInt32 ch);
+
+ // Append a string
+ void AppendString(const wchar_t* pstr, SPInt len = -1);
+ void AppendString(const char* putf8str, SPInt utf8StrSz = -1);
+ void AppendFormat(const char* format, ...);
+
+ // Assigned a string with dynamic data (copied through initializer).
+ //void AssignString(const InitStruct& src, UPInt size);
+
+ // Inserts substr at posAt
+ void Insert (const char* substr, UPInt posAt, SPInt len = -1);
+ // Inserts character at posAt
+ UPInt InsertCharAt(UInt32 c, UPInt posAt);
+
+ // Assignment
+ void operator = (const char* str);
+ void operator = (const wchar_t* str);
+ void operator = (const String& src);
+ void operator = (const StringBuffer& src);
+
+ // Addition
+ void operator += (const String& src) { AppendString(src.ToCStr(),src.GetSize()); }
+ void operator += (const char* psrc) { AppendString(psrc); }
+ void operator += (const wchar_t* psrc) { AppendString(psrc); }
+ void operator += (char ch) { AppendChar(ch); }
+ //String operator + (const char* str) const ;
+ //String operator + (const String& src) const ;
+
+ // Accesses raw bytes
+ char& operator [] (int index)
+ {
+ OVR_ASSERT(((UPInt)index) < GetSize());
+ return pData[index];
+ }
+ char& operator [] (UPInt index)
+ {
+ OVR_ASSERT(index < GetSize());
+ return pData[index];
+ }
+
+ const char& operator [] (int index) const
+ {
+ OVR_ASSERT(((UPInt)index) < GetSize());
+ return pData[index];
+ }
+ const char& operator [] (UPInt index) const
+ {
+ OVR_ASSERT(index < GetSize());
+ return pData[index];
+ }
+};
+
+
+//
+// Wrapper for string data. The data must have a guaranteed
+// lifespan throughout the usage of the wrapper. Not intended for
+// cached usage. Not thread safe.
+//
+class StringDataPtr
+{
+public:
+ StringDataPtr() : pStr(NULL), Size(0) {}
+ StringDataPtr(const StringDataPtr& p)
+ : pStr(p.pStr), Size(p.Size) {}
+ StringDataPtr(const char* pstr, UPInt sz)
+ : pStr(pstr), Size(sz) {}
+ StringDataPtr(const char* pstr)
+ : pStr(pstr), Size((pstr != NULL) ? OVR_strlen(pstr) : 0) {}
+ explicit StringDataPtr(const String& str)
+ : pStr(str.ToCStr()), Size(str.GetSize()) {}
+ template <typename T, int N>
+ StringDataPtr(const T (&v)[N])
+ : pStr(v), Size(N) {}
+
+public:
+ const char* ToCStr() const { return pStr; }
+ UPInt GetSize() const { return Size; }
+ bool IsEmpty() const { return GetSize() == 0; }
+
+ // value is a prefix of this string
+ // Character's values are not compared.
+ bool IsPrefix(const StringDataPtr& value) const
+ {
+ return ToCStr() == value.ToCStr() && GetSize() >= value.GetSize();
+ }
+ // value is a suffix of this string
+ // Character's values are not compared.
+ bool IsSuffix(const StringDataPtr& value) const
+ {
+ return ToCStr() <= value.ToCStr() && (End()) == (value.End());
+ }
+
+ // Find first character.
+ // init_ind - initial index.
+ SPInt FindChar(char c, UPInt init_ind = 0) const
+ {
+ for (UPInt i = init_ind; i < GetSize(); ++i)
+ if (pStr[i] == c)
+ return static_cast<SPInt>(i);
+
+ return -1;
+ }
+
+ // Find last character.
+ // init_ind - initial index.
+ SPInt FindLastChar(char c, UPInt init_ind = ~0) const
+ {
+ if (init_ind == (UPInt)~0 || init_ind > GetSize())
+ init_ind = GetSize();
+ else
+ ++init_ind;
+
+ for (UPInt i = init_ind; i > 0; --i)
+ if (pStr[i - 1] == c)
+ return static_cast<SPInt>(i - 1);
+
+ return -1;
+ }
+
+ // Create new object and trim size bytes from the left.
+ StringDataPtr GetTrimLeft(UPInt size) const
+ {
+ // Limit trim size to the size of the string.
+ size = Alg::PMin(GetSize(), size);
+
+ return StringDataPtr(ToCStr() + size, GetSize() - size);
+ }
+ // Create new object and trim size bytes from the right.
+ StringDataPtr GetTrimRight(UPInt size) const
+ {
+ // Limit trim to the size of the string.
+ size = Alg::PMin(GetSize(), size);
+
+ return StringDataPtr(ToCStr(), GetSize() - size);
+ }
+
+ // Create new object, which contains next token.
+ // Useful for parsing.
+ StringDataPtr GetNextToken(char separator = ':') const
+ {
+ UPInt cur_pos = 0;
+ const char* cur_str = ToCStr();
+
+ for (; cur_pos < GetSize() && cur_str[cur_pos]; ++cur_pos)
+ {
+ if (cur_str[cur_pos] == separator)
+ {
+ break;
+ }
+ }
+
+ return StringDataPtr(ToCStr(), cur_pos);
+ }
+
+ // Trim size bytes from the left.
+ StringDataPtr& TrimLeft(UPInt size)
+ {
+ // Limit trim size to the size of the string.
+ size = Alg::PMin(GetSize(), size);
+ pStr += size;
+ Size -= size;
+
+ return *this;
+ }
+ // Trim size bytes from the right.
+ StringDataPtr& TrimRight(UPInt size)
+ {
+ // Limit trim to the size of the string.
+ size = Alg::PMin(GetSize(), size);
+ Size -= size;
+
+ return *this;
+ }
+
+ const char* Begin() const { return ToCStr(); }
+ const char* End() const { return ToCStr() + GetSize(); }
+
+ // Hash functor used string data pointers
+ struct HashFunctor
+ {
+ UPInt operator()(const StringDataPtr& data) const
+ {
+ return String::BernsteinHashFunction(data.ToCStr(), data.GetSize());
+ }
+ };
+
+ bool operator== (const StringDataPtr& data) const
+ {
+ return (OVR_strncmp(pStr, data.pStr, data.Size) == 0);
+ }
+
+protected:
+ const char* pStr;
+ UPInt Size;
+};
+
+} // OVR
+
+#endif
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