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ring_buf_opt.c
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ring_buf_opt.c
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// #include <stdlib.h>
#include "util_def.h"
#include "ring_buf_opt.h"
//=============================================================================
// Constant Definition
//=============================================================================
//=============================================================================
// Macro Definition
//=============================================================================
//=============================================================================
// Structure Definition
//=============================================================================
//=============================================================================
// Global Data Definition
//=============================================================================
//=============================================================================
// Private Function Definition
//=============================================================================
//=============================================================================
// Public Function Definition
//=============================================================================
int
rb_opt_init(
rb_operator_t *pRbOpt,
unsigned char *pStart_ptr,
unsigned int buf_size)
{
if( !pRbOpt ) return -1;
pRbOpt->pBuf_start_ptr = pStart_ptr + (buf_size & 0x3);
pRbOpt->pRead_ptr[RB_READ_TYPE_FETCH] = pRbOpt->pBuf_start_ptr;
pRbOpt->pRead_ptr[RB_READ_TYPE_REMOVE] = pRbOpt->pBuf_start_ptr;
pRbOpt->pWrite_ptr = pRbOpt->pBuf_start_ptr;
pRbOpt->pBuf_end_ptr = pStart_ptr + buf_size;
pRbOpt->pValid_end_ptr[RB_READ_TYPE_FETCH] = pRbOpt->pBuf_end_ptr;
pRbOpt->pValid_end_ptr[RB_READ_TYPE_REMOVE] = pRbOpt->pBuf_end_ptr;
return 0;
}
int
rb_opt_update_w(
rb_operator_t *pRbOpt,
rb_w_data_info_t *pData_info)
{
int i;
unsigned char *w_ptr = pRbOpt->pWrite_ptr;
unsigned char *r_ptr = pRbOpt->pRead_ptr[RB_READ_TYPE_REMOVE];
unsigned int item_size = 0;
for(i = 0; i < pData_info->amount; i++)
{
item_size += pData_info->pData_size[i];
}
// 32 bits alignment
item_size = (item_size + 0x3) & ~0x3;
if( w_ptr > r_ptr )
{
if( (w_ptr + item_size) > pRbOpt->pBuf_end_ptr )
{
if( (pRbOpt->pBuf_start_ptr + item_size) >= r_ptr )
{
dbg_msg("\tNo space to write, drop current item !!\n");
return -1;
}
pRbOpt->pValid_end_ptr[RB_READ_TYPE_FETCH] = (unsigned char*)(((unsigned int)w_ptr + 0x3) & ~0x3);
pRbOpt->pValid_end_ptr[RB_READ_TYPE_REMOVE] = (unsigned char*)(((unsigned int)w_ptr + 0x3) & ~0x3);
w_ptr = pRbOpt->pBuf_start_ptr;
}
}
else
{
if( w_ptr != r_ptr &&
(w_ptr + item_size) >= r_ptr )
{
dbg_msg("\tW_pointer catch R_pointer, drop current item !!\n");
return -1;
}
}
for(i = 0; i < pData_info->amount; i++)
{
memcpy((void*)w_ptr, (void*)pData_info->ppData[i], pData_info->pData_size[i]);
w_ptr += pData_info->pData_size[i];
}
// 32 bits alignment
w_ptr = (unsigned char*)(((unsigned int)w_ptr + 0x3) & ~0x3);
pRbOpt->pWrite_ptr = w_ptr;
return 0;
}
int
rb_opt_update_r(
rb_operator_t *pRbOpt,
rb_read_type_t read_idx,
unsigned char **ppData,
unsigned int *pData_size,
get_item_size cb_get_item_size)
{
unsigned char *w_ptr;
unsigned char *r_ptr;
unsigned int item_size = 0;
unsigned int item_size_align = 0;
unsigned int bDummy_item = 0;
if( cb_get_item_size == NULL )
return -1;
switch( read_idx )
{
case RB_READ_TYPE_FETCH:
w_ptr = pRbOpt->pWrite_ptr;
r_ptr = pRbOpt->pRead_ptr[RB_READ_TYPE_FETCH];
break;
case RB_READ_TYPE_REMOVE:
w_ptr = pRbOpt->pRead_ptr[RB_READ_TYPE_FETCH];
r_ptr = pRbOpt->pRead_ptr[RB_READ_TYPE_REMOVE];
break;
default:
return -1;
}
cb_get_item_size(w_ptr, r_ptr, &item_size, &bDummy_item);
if( item_size == 0 )
{
*ppData = NULL;
*pData_size = 0;
return -2;
}
// 32 bits alignment
item_size_align = (item_size + 0x3) & ~0x3;
if( w_ptr < r_ptr ||
(r_ptr + item_size_align) < w_ptr )
{
*ppData = r_ptr;
*pData_size = item_size;
r_ptr += item_size_align;
if( r_ptr == pRbOpt->pValid_end_ptr[read_idx] )
{
pRbOpt->pValid_end_ptr[read_idx] = pRbOpt->pBuf_end_ptr;
r_ptr = pRbOpt->pBuf_start_ptr;
}
if( bDummy_item )
{
*pData_size = RB_INVALID_SIZE;
}
}
else
{
*ppData = NULL;
*pData_size = 0;
}
pRbOpt->pRead_ptr[read_idx] = r_ptr;
return 0;
}
int
rb_opt_peek_r(
rb_operator_t *pRbOpt,
rb_read_type_t read_idx,
unsigned char **ppData,
unsigned int *pData_size,
get_item_size cb_get_item_size)
{
unsigned char *w_ptr;
unsigned char *r_ptr;
unsigned int item_size = 0;
unsigned int item_size_align = 0;
unsigned int bDummy_item = 0;
if( cb_get_item_size == NULL )
return -1;
switch( read_idx )
{
case RB_READ_TYPE_FETCH:
w_ptr = pRbOpt->pWrite_ptr;
r_ptr = pRbOpt->pRead_ptr[RB_READ_TYPE_FETCH];
break;
case RB_READ_TYPE_REMOVE:
w_ptr = pRbOpt->pRead_ptr[RB_READ_TYPE_FETCH];
r_ptr = pRbOpt->pRead_ptr[RB_READ_TYPE_REMOVE];
break;
default:
return -1;
}
cb_get_item_size(w_ptr, r_ptr, &item_size, &bDummy_item);
if( item_size == 0 )
{
*ppData = NULL;
*pData_size = 0;
return -2;
}
// 32 bits alignment
item_size_align = (item_size + 0x3) & ~0x3;
if( w_ptr < r_ptr ||
(r_ptr + item_size_align) < w_ptr )
{
*ppData = r_ptr;
*pData_size = item_size;
}
else
{
*ppData = NULL;
*pData_size = 0;
}
return 0;
}
int
rb_opt_confirm_space(
rb_operator_t *pRbOpt,
unsigned int target_size)
{
unsigned char *w_ptr = pRbOpt->pWrite_ptr;
unsigned char *r_ptr = pRbOpt->pRead_ptr[RB_READ_TYPE_REMOVE];
unsigned int remain_size = 0;
if( w_ptr > r_ptr )
{
remain_size = pRbOpt->pBuf_end_ptr - w_ptr;
remain_size += (r_ptr - pRbOpt->pBuf_start_ptr);
}
else if( w_ptr == r_ptr )
remain_size = pRbOpt->pBuf_end_ptr - pRbOpt->pBuf_start_ptr;
else
remain_size = r_ptr - w_ptr;
return (remain_size < target_size) ? 0 : 1;
}
int
rb_opt_remain_size(
rb_operator_t *pRbOpt)
{
unsigned char *w_ptr = pRbOpt->pWrite_ptr;
unsigned char *r_ptr = pRbOpt->pRead_ptr[RB_READ_TYPE_REMOVE];
int remain_size = 0;
if( w_ptr > r_ptr )
{
remain_size = pRbOpt->pBuf_end_ptr - w_ptr;
remain_size += (r_ptr - pRbOpt->pBuf_start_ptr);
}
else if( w_ptr == r_ptr )
remain_size = pRbOpt->pBuf_end_ptr - pRbOpt->pBuf_start_ptr;
else
remain_size = r_ptr - w_ptr;
return remain_size;
}