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111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
#ifndef LLARP_BUFFER_H_
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#define LLARP_BUFFER_H_
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#include <common.hpp>
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#include <mem.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/**
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* buffer.h
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*
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* generic memory buffer
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*/
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typedef uint8_t byte_t;
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/**
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llarp_buffer_t represents a region of memory that is ONLY
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valid in the current scope.
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make sure to follow the rules:
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ALWAYS copy the contents of the buffer if that data is to be used outside the
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current scope.
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ALWAYS pass a llarp_buffer_t * if you plan on modifying the data associated
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with the buffer
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ALWAYS pass a llarp_buffer_t * if you plan on advancing the stream position
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ALWAYS pass a llarp_buffer_t if you are doing a read only operation that does
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not modify the buffer
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ALWAYS pass a llarp_buffer_t if you don't want to advance the stream position
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ALWAYS bail out of the current operation if you run out of space in a buffer
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ALWAYS assume the pointers in the buffer are stack allocated memory
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(yes even if you know they are not)
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NEVER malloc() the pointers in the buffer when using it
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NEVER realloc() the pointers in the buffer when using it
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NEVER free() the pointers in the buffer when using it
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NEVER use llarp_buffer_t ** (double pointers)
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NEVER use llarp_buffer_t ** (double pointers)
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ABSOLUTELY NEVER USE DOUBLE POINTERS.
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*/
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typedef struct llarp_buffer_t
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{
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/// starting memory address
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byte_t *base;
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/// memory address of stream position
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byte_t *cur;
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/// max size of buffer
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size_t sz;
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#ifdef __cplusplus
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byte_t operator[](size_t x)
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{
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return *(this->base + x);
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}
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#endif
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} llarp_buffer_t;
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/// how much room is left in buffer
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size_t
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llarp_buffer_size_left(llarp_buffer_t buff);
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/// write a chunk of data size "sz"
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bool
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llarp_buffer_write(llarp_buffer_t *buff, const void *data, size_t sz);
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/// write multiple strings
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bool
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llarp_buffer_writef(llarp_buffer_t *buff, const char *fmt, ...);
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/// read buffer upto character delimiter
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size_t
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llarp_buffer_read_until(llarp_buffer_t *buff, char delim, byte_t *result,
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size_t resultlen);
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/// compare buffers, true if equal else false
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bool
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llarp_buffer_eq(llarp_buffer_t buff, const char *data);
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/// put big endian unsigned 16 bit integer
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bool
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llarp_buffer_put_uint16(llarp_buffer_t *buf, uint16_t i);
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/// put big endian unsigned 32 bit integer
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bool
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llarp_buffer_put_uint32(llarp_buffer_t *buf, uint32_t i);
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/// read big endian unsigned 16 bit integer
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bool
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llarp_buffer_read_uint16(llarp_buffer_t *buf, uint16_t *i);
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/// read big endian unsigned 32 bit integer
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bool
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llarp_buffer_read_uint32(llarp_buffer_t *buf, uint32_t *i);
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#endif
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