86 lines
2.4 KiB
C++
86 lines
2.4 KiB
C++
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// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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// Copyright (C) 2009-2011, International Business Machines
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// Corporation and others. All Rights Reserved.
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//
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// Copyright 2007 Google Inc. All Rights Reserved.
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// Author: sanjay@google.com (Sanjay Ghemawat)
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#include "unicode/utypes.h"
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#include "unicode/bytestream.h"
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#include "cmemory.h"
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U_NAMESPACE_BEGIN
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ByteSink::~ByteSink() {}
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char* ByteSink::GetAppendBuffer(int32_t min_capacity,
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int32_t /*desired_capacity_hint*/,
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char* scratch, int32_t scratch_capacity,
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int32_t* result_capacity) {
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if (min_capacity < 1 || scratch_capacity < min_capacity) {
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*result_capacity = 0;
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return NULL;
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}
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*result_capacity = scratch_capacity;
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return scratch;
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}
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void ByteSink::Flush() {}
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CheckedArrayByteSink::CheckedArrayByteSink(char* outbuf, int32_t capacity)
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: outbuf_(outbuf), capacity_(capacity < 0 ? 0 : capacity),
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size_(0), appended_(0), overflowed_(FALSE) {
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}
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CheckedArrayByteSink::~CheckedArrayByteSink() {}
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CheckedArrayByteSink& CheckedArrayByteSink::Reset() {
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size_ = appended_ = 0;
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overflowed_ = FALSE;
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return *this;
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}
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void CheckedArrayByteSink::Append(const char* bytes, int32_t n) {
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if (n <= 0) {
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return;
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}
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if (n > (INT32_MAX - appended_)) {
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// TODO: Report as integer overflow, not merely buffer overflow.
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appended_ = INT32_MAX;
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overflowed_ = TRUE;
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return;
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}
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appended_ += n;
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int32_t available = capacity_ - size_;
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if (n > available) {
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n = available;
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overflowed_ = TRUE;
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}
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if (n > 0 && bytes != (outbuf_ + size_)) {
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uprv_memcpy(outbuf_ + size_, bytes, n);
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}
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size_ += n;
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}
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char* CheckedArrayByteSink::GetAppendBuffer(int32_t min_capacity,
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int32_t /*desired_capacity_hint*/,
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char* scratch,
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int32_t scratch_capacity,
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int32_t* result_capacity) {
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if (min_capacity < 1 || scratch_capacity < min_capacity) {
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*result_capacity = 0;
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return NULL;
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}
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int32_t available = capacity_ - size_;
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if (available >= min_capacity) {
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*result_capacity = available;
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return outbuf_ + size_;
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} else {
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*result_capacity = scratch_capacity;
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return scratch;
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}
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}
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U_NAMESPACE_END
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