net_mem.h

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#ifndef _NET_MEM_H
#define _NET_MEM_H
 
//Dependencies
#include "net_config.h"
#include "os_port.h"
#include "error.h"
 
//Use fixed-size blocks allocation?
#ifndef NET_MEM_POOL_SUPPORT
   #define NET_MEM_POOL_SUPPORT DISABLED
#elif (NET_MEM_POOL_SUPPORT != ENABLED && NET_MEM_POOL_SUPPORT != DISABLED)
   #error NET_MEM_POOL_SUPPORT parameter is not valid
#endif
 
//Number of buffers available
#ifndef NET_MEM_POOL_BUFFER_COUNT
   #define NET_MEM_POOL_BUFFER_COUNT 32
#elif (NET_MEM_POOL_BUFFER_COUNT < 1)
   #error NET_MEM_POOL_BUFFER_COUNT parameter is not valid
#endif
 
//Size of the buffers
#ifndef NET_MEM_POOL_BUFFER_SIZE
   #define NET_MEM_POOL_BUFFER_SIZE 1536
#elif (NET_MEM_POOL_BUFFER_SIZE < 128)
   #error NET_MEM_POOL_BUFFER_SIZE parameter is not valid
#endif
 
//Size of the header part of the buffer
#define CHUNKED_BUFFER_HEADER_SIZE (sizeof(NetBuffer) + MAX_CHUNK_COUNT * sizeof(ChunkDesc))
 
//Helper macro for defining a buffer
#define N(size) (((size) + NET_MEM_POOL_BUFFER_SIZE - 1) / NET_MEM_POOL_BUFFER_SIZE)
 
//C++ guard
#ifdef __cplusplus
extern "C" {
#endif
 
 
typedef struct
{
   void *address;
   uint16_t length;
   uint16_t size;
} ChunkDesc;
 
 
typedef struct
{
   uint_t chunkCount;
   uint_t maxChunkCount;
   ChunkDesc chunk[];
} NetBuffer;
 
 
typedef struct
{
   uint_t chunkCount;
   uint_t maxChunkCount;
   ChunkDesc chunk[1];
} NetBuffer1;
 
 
//Memory management functions
error_t memPoolInit(void);
void *memPoolAlloc(size_t size);
void memPoolFree(void *p);
void memPoolGetStats(uint_t *currentUsage, uint_t *maxUsage, uint_t *size);
 
NetBuffer *netBufferAlloc(size_t length);
void netBufferFree(NetBuffer *buffer);
 
size_t netBufferGetLength(const NetBuffer *buffer);
error_t netBufferSetLength(NetBuffer *buffer, size_t length);
 
void *netBufferAt(const NetBuffer *buffer, size_t offset);
 
error_t netBufferConcat(NetBuffer *dest,
   const NetBuffer *src, size_t srcOffset, size_t length);
 
error_t netBufferCopy(NetBuffer *dest, size_t destOffset,
   const NetBuffer *src, size_t srcOffset, size_t length);
 
error_t netBufferAppend(NetBuffer *dest, const void *src, size_t length);
 
size_t netBufferWrite(NetBuffer *dest,
   size_t destOffset, const void *src, size_t length);
 
size_t netBufferRead(void *dest, const NetBuffer *src,
   size_t srcOffset, size_t length);
 
//C++ guard
#ifdef __cplusplus
}
#endif
 
#endif