33     virtual size_t idealAllocSize(size_t len) {  in idealAllocSize()  argument
34         return m_bufsize < len ? len : m_bufsize;  in idealAllocSize()
39     virtual const unsigned char *readFully( void *buf, size_t len) = 0;
40     virtual const unsigned char *commitBufferAndReadFully(size_t size, void *buf, size_t len) = 0;
42     virtual int writeFully(const void* buf, size_t len) = 0;
49     virtual unsigned char *alloc(size_t len) {  in alloc()  argument
51         if (m_iostreamBuf && len > m_free) {  in alloc()
58         if (!m_iostreamBuf || len > m_bufsize) {  in alloc()
59             int allocLen = this->idealAllocSize(len);  in alloc()
71         m_free -= len;  in alloc()
86     const unsigned char *readback(void *buf, size_t len) {  in readback()  argument
91             return commitBufferAndReadFully(size, buf, len);  in readback()
93         return readFully(buf, len);  in readback()