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AP_HAL: added set_size() to RingBuffer API

This commit is contained in:
Andrew Tridgell 2016-05-23 23:30:56 +10:00
parent eb4707f65c
commit 595d5c0002
2 changed files with 15 additions and 0 deletions
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12
libraries/AP_HAL/utility/RingBuffer.cpp
View File

@ -18,6 +18,18 @@ ByteBuffer::~ByteBuffer(void)
delete [] buf; delete [] buf;
} }
/*
caller is responsible for locking in set_size()
*/
void ByteBuffer::set_size(uint32_t _size)
{
uint8_t *oldbuf = buf;
head = tail = 0;
size = _size;
buf = new uint8_t[size];
delete [] oldbuf;
}
uint32_t ByteBuffer::available(void) const uint32_t ByteBuffer::available(void) const
{ {
uint32_t _tail; uint32_t _tail;

3
libraries/AP_HAL/utility/RingBuffer.h
View File

@ -55,6 +55,9 @@ public:
// return size of ringbuffer // return size of ringbuffer
uint32_t get_size(void) const { return size; } uint32_t get_size(void) const { return size; }
// set size of ringbuffer, caller responsible for locking
void set_size(uint32_t size);
// advance the read pointer (discarding bytes) // advance the read pointer (discarding bytes)
bool advance(uint32_t n); bool advance(uint32_t n);