projects / apple / icu.git / blame
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|---|---|---|
| f3c0d7a5 A |
1 | // © 2016 and later: Unicode, Inc. and others. |
| 2 | // License & terms of use: http://www.unicode.org/copyright.html | |
| 4388f060 | 3 | // Copyright (C) 2009-2011, International Business Machines |
| 729e4ab9 A |
4 | // Corporation and others. All Rights Reserved. |
| 5 | // | |
| 6 | // Copyright 2007 Google Inc. All Rights Reserved. | |
| 7 | // Author: sanjay@google.com (Sanjay Ghemawat) | |
| 8 | ||
| 9 | #include "unicode/utypes.h" | |
| 10 | #include "unicode/bytestream.h" | |
| 11 | #include "cmemory.h" | |
| 12 | ||
| 13 | U_NAMESPACE_BEGIN | |
| 14 | ||
| 4388f060 A |
15 | ByteSink::~ByteSink() {} |
| 16 | ||
| 729e4ab9 A |
17 | char* ByteSink::GetAppendBuffer(int32_t min_capacity, |
| 18 | int32_t /*desired_capacity_hint*/, | |
| 19 | char* scratch, int32_t scratch_capacity, | |
| 20 | int32_t* result_capacity) { | |
| 21 | if (min_capacity < 1 || scratch_capacity < min_capacity) { | |
| 22 | *result_capacity = 0; | |
| 23 | return NULL; | |
| 24 | } | |
| 25 | *result_capacity = scratch_capacity; | |
| 26 | return scratch; | |
| 27 | } | |
| 28 | ||
| 29 | void ByteSink::Flush() {} | |
| 30 | ||
| 31 | CheckedArrayByteSink::CheckedArrayByteSink(char* outbuf, int32_t capacity) | |
| 32 | : outbuf_(outbuf), capacity_(capacity < 0 ? 0 : capacity), | |
| 33 | size_(0), appended_(0), overflowed_(FALSE) { | |
| 34 | } | |
| 35 | ||
| 4388f060 A |
36 | CheckedArrayByteSink::~CheckedArrayByteSink() {} |
| 37 | ||
| 729e4ab9 A |
38 | CheckedArrayByteSink& CheckedArrayByteSink::Reset() { |
| 39 | size_ = appended_ = 0; | |
| 40 | overflowed_ = FALSE; | |
| 41 | return *this; | |
| 42 | } | |
| 43 | ||
| 44 | void CheckedArrayByteSink::Append(const char* bytes, int32_t n) { | |
| 45 | if (n <= 0) { | |
| 46 | return; | |
| 47 | } | |
| 0f5d89e8 A |
48 | if (n > (INT32_MAX - appended_)) { |
| 49 | // TODO: Report as integer overflow, not merely buffer overflow. | |
| 50 | appended_ = INT32_MAX; | |
| 51 | overflowed_ = TRUE; | |
| 52 | return; | |
| 53 | } | |
| 729e4ab9 A |
54 | appended_ += n; |
| 55 | int32_t available = capacity_ - size_; | |
| 56 | if (n > available) { | |
| 57 | n = available; | |
| 58 | overflowed_ = TRUE; | |
| 59 | } | |
| 60 | if (n > 0 && bytes != (outbuf_ + size_)) { | |
| 61 | uprv_memcpy(outbuf_ + size_, bytes, n); | |
| 62 | } | |
| 63 | size_ += n; | |
| 64 | } | |
| 65 | ||
| 66 | char* CheckedArrayByteSink::GetAppendBuffer(int32_t min_capacity, | |
| 67 | int32_t /*desired_capacity_hint*/, | |
| 68 | char* scratch, | |
| 69 | int32_t scratch_capacity, | |
| 70 | int32_t* result_capacity) { | |
| 71 | if (min_capacity < 1 || scratch_capacity < min_capacity) { | |
| 72 | *result_capacity = 0; | |
| 73 | return NULL; | |
| 74 | } | |
| 75 | int32_t available = capacity_ - size_; | |
| 76 | if (available >= min_capacity) { | |
| 77 | *result_capacity = available; | |
| 78 | return outbuf_ + size_; | |
| 79 | } else { | |
| 80 | *result_capacity = scratch_capacity; | |
| 81 | return scratch; | |
| 82 | } | |
| 83 | } | |
| 84 | ||
| 85 | U_NAMESPACE_END |