296 lines
10 KiB
C
296 lines
10 KiB
C
/**
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* An implementation of an IPFS node
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* Copying the go-ipfs-node project
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*/
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#ifndef IPFS_NODE_H
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#define IPFS_NODE_H
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#include "ipfs/cid/cid.h"
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/*====================================================================================
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*
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* Structures
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*
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*===================================================================================*/
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struct NodeLink
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{
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size_t hash_size;
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unsigned char* hash;
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char* name;
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size_t t_size;
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struct NodeLink* next;
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};
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struct Node
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{
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// saved in protobuf
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size_t data_size;
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unsigned char* data;
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struct NodeLink* head_link;
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// not saved in protobuf
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unsigned char* encoded;
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// a base32 representation of the multihash
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unsigned char* hash;
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size_t hash_size;
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};
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/*====================================================================================
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*
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* Functions
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*
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*===================================================================================*/
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/*====================================================================================
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* Link Functions
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*===================================================================================*/
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/* Create_Link
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* @Param name: The name of the link (char *)
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* @Param ahash: An Qmhash
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* @param hash_size the size of the hash
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* @param node_link a pointer to the new struct NodeLink
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* @returns true(1) on success
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*/
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int ipfs_node_link_create(char * name, unsigned char * ahash, size_t hash_size, struct NodeLink** node_link);
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/****
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* Allocate memory for a new NodeLink
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* @param node_link a pointer to the newly allocated memory
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* @returns true(1) on success
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*/
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int ipfs_node_link_new(struct NodeLink** node_link);
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/* ipfs_node_link_free
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* @param L: Free the link you have allocated.
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*/
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int ipfs_node_link_free(struct NodeLink * node_link);
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/***
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* Node protobuf functions
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*/
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/***
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* Get the approximate size needed to protobuf encode this link
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* @param link the link to examine
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* @returns the maximum size that should be needed
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*/
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size_t ipfs_node_link_protobuf_encode_size(const struct NodeLink* link);
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/***
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* Encode a NodeLink into protobuf format
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* @param link the link
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* @param buffer where to put the encoded results
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* @param max_buffer_length the max size that should be put in buffer
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* @pram bytes_written the amount of the buffer used
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* @returns true(1) on success
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*/
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int ipfs_node_link_protobuf_encode(const struct NodeLink* link, unsigned char* buffer, size_t max_buffer_length, size_t* bytes_written);
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/****
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* Decode from a byte array into a NodeLink
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* @param buffer the byte array
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* @param buffer_length the length of the byte array
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* @param link the pointer to the new NodeLink (NOTE: Will be allocated in this function)
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* @param bytes_read the amount of bytes read by this function
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* @returns true(1) on success
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*/
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int ipfs_node_link_protobuf_decode(unsigned char* buffer, size_t buffer_length, struct NodeLink** link);
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/***
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* return an approximate size of the encoded node
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* @param node the node to examine
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* @returns the max size of an encoded stream of bytes, if it were encoded
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*/
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size_t ipfs_node_protobuf_encode_size(const struct Node* node);
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/***
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* Encode a node into a protobuf byte stream
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* @param node the node to encode
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* @param buffer where to put it
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* @param max_buffer_length the length of buffer
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* @param bytes_written how much of buffer was used
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* @returns true(1) on success
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*/
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int ipfs_node_protobuf_encode(const struct Node* node, unsigned char* buffer, size_t max_buffer_length, size_t* bytes_written);
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/***
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* Decode a stream of bytes into a Node structure
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* @param buffer where to get the bytes from
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* @param buffer_length the length of buffer
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* @param node pointer to the Node to be created
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* @returns true(1) on success
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*/
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int ipfs_node_protobuf_decode(unsigned char* buffer, size_t buffer_length, struct Node** node);
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/*====================================================================================
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* Node Functions
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*===================================================================================*/
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/****
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* Creates an empty node, allocates the required memory
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* @param node the pointer to the memory allocated
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* @returns true(1) on success, otherwise false(0)
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*/
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int ipfs_node_new(struct Node** node);
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/***
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* Allocates memory for a node, and sets the data section to indicate
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* that this node is a directory
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* @param node the node to initialize
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* @returns true(1) on success, otherwise false(0)
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*/
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int ipfs_node_create_directory(struct Node** node);
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/***
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* Determine if this node is actually a directory
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* @param node the node to examine
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* @returns true(1) if this node is a directory. Otherwise, false(0)
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*/
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int ipfs_node_is_directory(struct Node* node);
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/**
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* sets the Cid into the struct element titled cached
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* @param node the node to work with
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* @param cid the cid
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* @returns true(1) on success
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*/
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int ipfs_node_set_hash(struct Node* node, const unsigned char* hash, size_t hash_size);
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/*ipfs_node_set_data
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* Sets the data of a node
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* @param Node: The node which you want to set data in.
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* @param Data, the data you want to assign to the node
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* Sets pointers of encoded & cached to NULL /following go method
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* returns 1 on success 0 on failure
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*/
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int ipfs_node_set_data(struct Node * N, unsigned char * Data, size_t data_size);
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/*ipfs_node_set_encoded
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* @param NODE: the node you wish to alter (struct Node *)
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* @param Data: The data you wish to set in encoded.(unsigned char *)
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* returns 1 on success 0 on failure
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*/
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int ipfs_node_set_encoded(struct Node * N, unsigned char * Data);
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/*ipfs_node_get_data
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* Gets data from a node
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* @param Node: = The node you want to get data from. (unsigned char *)
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* Returns data of node.
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*/
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unsigned char * ipfs_node_get_data(struct Node * N);
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/*ipfs_node_free
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* Once you are finished using a node, always delete it using this.
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* It will take care of the links inside it.
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* @param N: the node you want to free. (struct Node *)
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*/
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int ipfs_node_free(struct Node * N);
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/*ipfs_node_get_link_by_name
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* Returns a copy of the link with given name
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* @param Name: (char * name) searches for link with this name
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* Returns the link struct if it's found otherwise returns NULL
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*/
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struct NodeLink * ipfs_node_get_link_by_name(struct Node * N, char * Name);
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/*ipfs_node_remove_link_by_name
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* Removes a link from node if found by name.
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* @param name: Name of link (char * name)
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* returns 1 on success, 0 on failure.
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*/
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int ipfs_node_remove_link_by_name(char * Name, struct Node * mynode);
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/* ipfs_node_add_link
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* Adds a link to your node
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* @param mynode: &yournode
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* @param mylink: the CID you want to create a node from
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* @param linksz: sizeof(your cid here)
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* Returns your node with the newly added link
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*/
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int ipfs_node_add_link(struct Node * mynode, struct NodeLink * mylink);
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/*ipfs_node_new_from_link
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* Create a node from a link
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* @param mylink: the link you want to create it from. (struct Cid *)
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* @param node the pointer to the new node
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* @returns true(1) on success
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*/
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int ipfs_node_new_from_link(struct NodeLink * mylink, struct Node** node);
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/*ipfs_node_new_from_data
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* @param data: bytes buffer you want to create the node from
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* @param data_size the size of the data
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* @param node the pointer to the new node
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* @returns true(1) on success
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*/
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int ipfs_node_new_from_data(unsigned char * data, size_t data_size, struct Node** node);
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/***
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* create a Node struct from encoded data
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* @param data: encoded bytes buffer you want to create the node from. Note: this copies the pointer, not a memcpy
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* @param node a pointer to the node that will be created
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* @returns true(1) on success
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*/
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int ipfs_node_new_from_encoded(unsigned char * data, struct Node** node);
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/*Node_Resolve_Max_Size
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* !!!This shouldn't concern you!
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*Gets the ammount of words that will be returned by Node_Resolve
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*@Param1: The string that will be processed (eg: char * sentence = "foo/bar/bin")
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*Returns either -1 if something went wrong or the ammount of words that would be processed.
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*/
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int Node_Resolve_Max_Size(char * input1);
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/*Node_Resolve Basically stores everything in a pointer array eg: char * bla[Max_Words_]
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* !!!This shouldn't concern you!!!
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*@param1: Pointer array(char * foo[x], X=Whatever ammount there is. should be used with the helper function Node_Resolve_Max_Size)
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*@param2: Sentence to gather words/paths from (Eg: char * meh = "foo/bar/bin")
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*@Returns 1 or 0, 0 if something went wrong, 1 if everything went smoothly.
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*/
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int Node_Resolve(char ** result, char * input1);
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/**************************************************************************************************************************************
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*|||||||||||||||||||||||||||||||||||||||| !!!! IMPORTANT !!! ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||*
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**************************************************************************************************************************************
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* Not sure where this is used, I'm making something to easen it up for all of you.
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* This in itself will get all the links for you in a link[] array inside Link_Proc
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* the memory allocation for storage will be noted in the ammount of links.
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* After being done with this, you have to free the array for which you will have a function specially made for you.
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*
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* What this does:
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* It searches for links using a path like /foo/bar/bin/, if links with those names are found in the node you specify, it stores them
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* in a custom struct, Link_Proc; which is what Node_Resolve_Link returns.
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* Notes:
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* Use it, free it, it's all already laid out for you.
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* There will also be a tutorial demonstrating it in the same folder here so everyone can understand this.
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*/
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struct Link_Proc
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{
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char * remaining_links; // Not your concern.
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int ammount; //This will store the ammount of links, so you know what to process.
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struct NodeLink * links[]; // Link array
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};
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/*Node_Resolve_Links
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* Processes a path returning all links.
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* @param N: The node you want to get links from
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* @param path: The "foo/bar/bin" path
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*/
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struct Link_Proc * Node_Resolve_Links(struct Node * N, char * path);
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/*Free_link_Proc
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* frees the Link_Proc struct you created.
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* @param1: Link_Proc struct (struct Link_Proc *)
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*/
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void Free_Link_Proc(struct Link_Proc * LPRC);
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/*Node_Tree() Basically a unix-like ls
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*@Param1: Result char * foo[strlen(sentence)]
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*@Param2: char sentence[] = foo/bar/bin/whatever
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*Return: 0 if failure, 1 if success
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*/
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int Node_Tree(char * result, char * input1); //I don't know where you use this but here it is.
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#endif
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