mirror of
https://github.com/oxen-io/lokinet.git
synced 2024-11-09 13:10:25 +00:00
91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
#ifndef LLARP_BUFFER_H_
|
|
#define LLARP_BUFFER_H_
|
|
#include <llarp/common.h>
|
|
#include <llarp/mem.h>
|
|
#include <stdbool.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
/**
|
|
* buffer.h
|
|
*
|
|
* generic memory buffer
|
|
*/
|
|
|
|
typedef uint8_t byte_t;
|
|
|
|
/**
|
|
llarp_buffer_t represents a region of memory that is ONLY
|
|
valid in the current scope.
|
|
|
|
make sure to follow the rules:
|
|
|
|
ALWAYS copy the contents of the buffer if that data is to be used outside the
|
|
current scope.
|
|
|
|
ALWAYS pass a llarp_buffer_t * if you plan on modifying the data associated
|
|
with the buffer
|
|
|
|
ALWAYS pass a llarp_buffer_t * if you plan on advancing the stream position
|
|
|
|
ALWAYS pass a llarp_buffer_t if you are doing a read only operation that does
|
|
not modify the buffer
|
|
|
|
ALWAYS pass a llarp_buffer_t if you don't want to advance the stream position
|
|
|
|
ALWAYS bail out of the current operation if you run out of space in a buffer
|
|
|
|
ALWAYS assume the pointers in the buffer are stack allocated memory
|
|
(yes even if you know they are not)
|
|
|
|
NEVER malloc() the pointers in the buffer when using it
|
|
|
|
NEVER realloc() the pointers in the buffer when using it
|
|
|
|
NEVER free() the pointers in the buffer when using it
|
|
|
|
NEVER use llarp_buffer_t ** (double pointers)
|
|
|
|
NEVER use llarp_buffer_t ** (double pointers)
|
|
|
|
ABSOLUTELY NEVER USE DOUBLE POINTERS.
|
|
|
|
*/
|
|
typedef struct llarp_buffer_t
|
|
{
|
|
/// starting memory address
|
|
byte_t *base;
|
|
/// memory address of stream position
|
|
byte_t *cur;
|
|
/// max size of buffer
|
|
size_t sz;
|
|
|
|
const byte_t operator[](size_t x)
|
|
{
|
|
return *(this->base + x);
|
|
}
|
|
} llarp_buffer_t;
|
|
|
|
/// how much room is left in buffer
|
|
size_t
|
|
llarp_buffer_size_left(llarp_buffer_t buff);
|
|
|
|
/// write a chunk of data size "sz"
|
|
bool
|
|
llarp_buffer_write(llarp_buffer_t *buff, const void *data, size_t sz);
|
|
|
|
/// write multiple strings
|
|
bool
|
|
llarp_buffer_writef(llarp_buffer_t *buff, const char *fmt, ...);
|
|
|
|
/// read buffer upto character delimiter
|
|
size_t
|
|
llarp_buffer_read_until(llarp_buffer_t *buff, char delim, byte_t *result,
|
|
size_t resultlen);
|
|
/// compare buffers, true if equal else false
|
|
bool
|
|
llarp_buffer_eq(llarp_buffer_t buff, const char *data);
|
|
|
|
#endif
|