/* * ngtcp2 * * Copyright (c) 2022 ngtcp2 contributors * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #ifndef NGTCP2_BALLOC_H #define NGTCP2_BALLOC_H #ifdef HAVE_CONFIG_H # include #endif /* HAVE_CONFIG_H */ #include #include "ngtcp2_buf.h" typedef struct ngtcp2_memblock_hd ngtcp2_memblock_hd; /* * ngtcp2_memblock_hd is the header of memory block. */ struct ngtcp2_memblock_hd { ngtcp2_memblock_hd *next; }; /* * ngtcp2_balloc is a custom memory allocator. It allocates |blklen| * bytes of memory at once on demand, and returns its slice when the * allocation is requested. */ typedef struct ngtcp2_balloc { /* mem is the underlying memory allocator. */ const ngtcp2_mem *mem; /* blklen is the size of memory block. */ size_t blklen; /* head points to the list of memory block allocated so far. */ ngtcp2_memblock_hd *head; /* buf wraps the current memory block for allocation requests. */ ngtcp2_buf buf; } ngtcp2_balloc; /* * ngtcp2_balloc_init initializes |balloc| with |blklen| which is the * size of memory block. */ void ngtcp2_balloc_init(ngtcp2_balloc *balloc, size_t blklen, const ngtcp2_mem *mem); /* * ngtcp2_balloc_free releases all allocated memory blocks. */ void ngtcp2_balloc_free(ngtcp2_balloc *balloc); /* * ngtcp2_balloc_get allocates |n| bytes of memory and assigns its * pointer to |*pbuf|. * * It returns 0 if it succeeds, or one of the following negative error * codes: * * NGTCP2_ERR_NOMEM * Out of memory. */ int ngtcp2_balloc_get(ngtcp2_balloc *balloc, void **pbuf, size_t n); /* * ngtcp2_balloc_clear releases all allocated memory blocks and * initializes its state. */ void ngtcp2_balloc_clear(ngtcp2_balloc *balloc); #endif /* NGTCP2_BALLOC_H */