ICU 4.4.2 4.4.2
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00001 // Copyright (C) 2009-2010, International Business Machines 00002 // Corporation and others. All Rights Reserved. 00003 // 00004 // Copyright 2007 Google Inc. All Rights Reserved. 00005 // Author: sanjay@google.com (Sanjay Ghemawat) 00006 // 00007 // Abstract interface that consumes a sequence of bytes (ByteSink). 00008 // 00009 // Used so that we can write a single piece of code that can operate 00010 // on a variety of output string types. 00011 // 00012 // Various implementations of this interface are provided: 00013 // ByteSink: 00014 // CheckedArrayByteSink Write to a flat array, with bounds checking 00015 // StringByteSink Write to an STL string 00016 00017 // This code is a contribution of Google code, and the style used here is 00018 // a compromise between the original Google code and the ICU coding guidelines. 00019 // For example, data types are ICU-ified (size_t,int->int32_t), 00020 // and API comments doxygen-ified, but function names and behavior are 00021 // as in the original, if possible. 00022 // Assertion-style error handling, not available in ICU, was changed to 00023 // parameter "pinning" similar to UnicodeString. 00024 // 00025 // In addition, this is only a partial port of the original Google code, 00026 // limited to what was needed so far. The (nearly) complete original code 00027 // is in the ICU svn repository at icuhtml/trunk/design/strings/contrib 00028 // (see ICU ticket 6765, r25517). 00029 00030 #ifndef __BYTESTREAM_H__ 00031 #define __BYTESTREAM_H__ 00032 00038 #include "unicode/utypes.h" 00039 #include "unicode/uobject.h" 00040 #include "unicode/std_string.h" 00041 00042 U_NAMESPACE_BEGIN 00043 00048 class U_COMMON_API ByteSink : public UMemory { 00049 public: 00054 ByteSink() { } 00059 virtual ~ByteSink() { } 00060 00067 virtual void Append(const char* bytes, int32_t n) = 0; 00068 00111 virtual char* GetAppendBuffer(int32_t min_capacity, 00112 int32_t desired_capacity_hint, 00113 char* scratch, int32_t scratch_capacity, 00114 int32_t* result_capacity); 00115 00123 virtual void Flush(); 00124 00125 private: 00126 ByteSink(const ByteSink &); // copy constructor not implemented 00127 ByteSink &operator=(const ByteSink &); // assignment operator not implemented 00128 }; 00129 00130 // ------------------------------------------------------------- 00131 // Some standard implementations 00132 00142 class U_COMMON_API CheckedArrayByteSink : public ByteSink { 00143 public: 00150 CheckedArrayByteSink(char* outbuf, int32_t capacity); 00157 virtual void Append(const char* bytes, int32_t n); 00172 virtual char* GetAppendBuffer(int32_t min_capacity, 00173 int32_t desired_capacity_hint, 00174 char* scratch, int32_t scratch_capacity, 00175 int32_t* result_capacity); 00181 int32_t NumberOfBytesWritten() const { return size_; } 00188 UBool Overflowed() const { return overflowed_; } 00189 private: 00190 char* outbuf_; 00191 const int32_t capacity_; 00192 int32_t size_; 00193 bool overflowed_; 00194 CheckedArrayByteSink(); 00195 CheckedArrayByteSink(const CheckedArrayByteSink &); 00196 CheckedArrayByteSink &operator=(const CheckedArrayByteSink &); 00197 }; 00198 00199 #if U_HAVE_STD_STRING 00200 00206 template<typename StringClass> 00207 class StringByteSink : public ByteSink { 00208 public: 00214 StringByteSink(StringClass* dest) : dest_(dest) { } 00221 virtual void Append(const char* data, int32_t n) { dest_->append(data, n); } 00222 private: 00223 StringClass* dest_; 00224 StringByteSink(); 00225 StringByteSink(const StringByteSink &); 00226 StringByteSink &operator=(const StringByteSink &); 00227 }; 00228 00229 #endif 00230 00231 U_NAMESPACE_END 00232 00233 #endif // __BYTESTREAM_H__