doubt in c programming

[deepa.selvaraj]

hi
i have .c .h file.but i dont know how to call each funtion in main.c .i dont know for each funtion parameter what should i give.i have attached .c .h file with this.

/* 7zBuffer.c */
 
#include "7zBuffer.h"
#include "7zAlloc.h"
 
void SzByteBufferInit(CSzByteBuffer *buffer)
{
  buffer->Capacity = 0;
  buffer->Items = 0;
}
 
int SzByteBufferCreate(CSzByteBuffer *buffer, size_t newCapacity, void * (*allocFunc)(size_t size))
{
  buffer->Capacity = newCapacity;
  if (newCapacity == 0)
  {
    buffer->Items = 0;
    return 1;
  }
  buffer->Items = (Byte *)allocFunc(newCapacity);
  return (buffer->Items != 0);
}
 
void SzByteBufferFree(CSzByteBuffer *buffer, void (*freeFunc)(void *))
{
  freeFunc(buffer->Items);
  buffer->Items = 0;
  buffer->Capacity = 0;
}

/* 7zBuffer.c */

#include "7zBuffer.h"
#include "7zAlloc.h"

void SzByteBufferInit(CSzByteBuffer *buffer)
{
  buffer->Capacity = 0;
  buffer->Items = 0;
}

int SzByteBufferCreate(CSzByteBuffer *buffer, size_t newCapacity, void * (*allocFunc)(size_t size))
{
  buffer->Capacity = newCapacity;
  if (newCapacity == 0)
  {
    buffer->Items = 0;
    return 1;
  }
  buffer->Items = (Byte *)allocFunc(newCapacity);
  return (buffer->Items != 0);
}

void SzByteBufferFree(CSzByteBuffer *buffer, void (*freeFunc)(void *))
{
  freeFunc(buffer->Items);
  buffer->Items = 0;
  buffer->Capacity = 0;
}

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[wysota]

What do you want to do? From what I see this is part of some API (7z compressor, probably). The three functions you pasted create, initialize and free the buffer.
From what I see you may use it as follows:

CSzByteBuffer buffer;
SzByteBufferInit(&buffer);
SzByteBufferCreate(&buffer, 10, malloc);
/* ... */
SzByteBufferFree(&buffer, free);

CSzByteBuffer buffer;
SzByteBufferInit(&buffer);
SzByteBufferCreate(&buffer, 10, malloc);
/* ... */
SzByteBufferFree(&buffer, free);

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