1 // Copyright (C) 2009, International Business Machines 2 // Corporation and others. All Rights Reserved. 3 // 4 // Copyright 2007 Google Inc. All Rights Reserved. 5 // Author: sanjay (at) google.com (Sanjay Ghemawat) 6 7 #include "unicode/utypes.h" 8 #include "unicode/bytestream.h" 9 #include "cmemory.h" 10 11 U_NAMESPACE_BEGIN 12 13 char* ByteSink::GetAppendBuffer(int32_t min_capacity, 14 int32_t /*desired_capacity_hint*/, 15 char* scratch, int32_t scratch_capacity, 16 int32_t* result_capacity) { 17 if (min_capacity < 1 || scratch_capacity < min_capacity) { 18 *result_capacity = 0; 19 return NULL; 20 } 21 *result_capacity = scratch_capacity; 22 return scratch; 23 } 24 25 void ByteSink::Flush() {} 26 27 CheckedArrayByteSink::CheckedArrayByteSink(char* outbuf, int32_t capacity) 28 : outbuf_(outbuf), capacity_(capacity < 0 ? 0 : capacity), size_(0), overflowed_(false) { 29 } 30 31 void CheckedArrayByteSink::Append(const char* bytes, int32_t n) { 32 if (n <= 0) { 33 return; 34 } 35 int32_t available = capacity_ - size_; 36 if (n > available) { 37 n = available; 38 overflowed_ = true; 39 } 40 if (n > 0 && bytes != (outbuf_ + size_)) { 41 uprv_memcpy(outbuf_ + size_, bytes, n); 42 } 43 size_ += n; 44 } 45 46 char* CheckedArrayByteSink::GetAppendBuffer(int32_t min_capacity, 47 int32_t /*desired_capacity_hint*/, 48 char* scratch, 49 int32_t scratch_capacity, 50 int32_t* result_capacity) { 51 if (min_capacity < 1 || scratch_capacity < min_capacity) { 52 *result_capacity = 0; 53 return NULL; 54 } 55 int32_t available = capacity_ - size_; 56 if (available >= min_capacity) { 57 *result_capacity = available; 58 return outbuf_ + size_; 59 } else { 60 *result_capacity = scratch_capacity; 61 return scratch; 62 } 63 } 64 65 U_NAMESPACE_END 66
