buffer.h

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#pragma once
 
#include <stdint.h>   // uint*_t
#include <stddef.h>   // size_t
#include <stdbool.h>  // bool
 
typedef enum {
    BE,  
    LE   
} endianness_t;
 
typedef struct {
    const uint8_t *ptr;     
    size_t         size;    
    size_t         offset;  
} buffer_t;
 
bool buffer_can_read(const buffer_t *buffer, size_t n);
 
bool buffer_seek_set(buffer_t *buffer, size_t offset);
 
bool buffer_seek_cur(buffer_t *buffer, size_t offset);
 
bool buffer_seek_end(buffer_t *buffer, size_t offset);
 
bool buffer_read_u8(buffer_t *buffer, uint8_t *value);
 
bool buffer_read_u16(buffer_t *buffer, uint16_t *value, endianness_t endianness);
 
bool buffer_read_u32(buffer_t *buffer, uint32_t *value, endianness_t endianness);
 
bool buffer_read_u64(buffer_t *buffer, uint64_t *value, endianness_t endianness);
 
bool buffer_read_varint(buffer_t *buffer, uint64_t *value);
 
bool buffer_read_bip32_path(buffer_t *buffer, uint32_t *out, size_t out_len);
 
bool buffer_copy(const buffer_t *buffer, uint8_t *out, size_t out_len);
 
bool buffer_move(buffer_t *buffer, uint8_t *out, size_t out_len);