cache.h

#include "csapp.h"

/*
    Guangyao Xie <guangyax>
    cache.h header file for proxylab


*/
#ifndef MAX_CACHE_SIZE
#define MAX_CACHE_SIZE 1049000
#define MAX_OBJECT_SIZE 102400
#endif

#ifndef NO_ENOUGH_SPACE
#define FOUND 1
#define NO_ENOUGH_SPACE 2
#define NO_FOUND 3
#define EMPTY_CACHE 4
#define RIO_ERROR 5
#endif

#ifndef debugprintf
#define debugprintf printf
#define GOTCHA printf("GOTCHA\n")
#endif
//void debugprintf();

typedef struct cache_node {
    char *hostname;
    char *uri;
    char *header;
    size_t block_size;
    char *content;
    struct cache_node *prev;
    struct cache_node *next;
} cache_node;

typedef struct cache_entry {
    struct cache_node *next;
    size_t available_size;
} cache_entry;

void init_cache();
int check_available(size_t size_needed);
int search_cache(char *search_hostname, char *search_uri,
         struct cache_node **cache_ptr);
struct cache_node* create_node(char *hostname, char *uri,
                size_t object_size, char *object_buf, char *header);
void insert_node(struct cache_node *new_node) ;
int detach_node(struct cache_node *detach_node);
void delete_node(struct cache_node *delete_node);
void evict_LRU(size_t size_needed);
void free_node_var(struct cache_node *delete_node);
void check_cachelist();