c-ipfs/journal/journal_entry.c

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C
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2017-08-24 15:08:27 +00:00
/**
* A journal entry protobuf
*/
#include "libp2p/utils/logger.h"
#include "ipfs/journal/journal_entry.h"
#include "protobuf.h"
struct JournalEntry* ipfs_journal_entry_new() {
struct JournalEntry* journal_entry = (struct JournalEntry*) malloc(sizeof(struct JournalEntry));
if (journal_entry != NULL) {
journal_entry->hash = NULL;
journal_entry->hash_size = 0;
journal_entry->pin = 0;
journal_entry->timestamp = 0;
}
return journal_entry;
}
int ipfs_journal_entry_free(struct JournalEntry* entry) {
if (entry != NULL) {
if (entry->hash != NULL) {
free(entry->hash);
entry->hash = NULL;
entry->hash_size = 0;
}
free(entry);
}
return 1;
}
/**
* Determine the maximum size of a protobuf'd JournalEntry
*/
int ipfs_journal_entry_encode_size(struct JournalEntry* entry) {
// hash
int retVal = entry->hash_size;
// hash size
retVal += 11;
// pin
retVal += 1;
// timestamp
retVal += 11;
return retVal;
}
/***
* Protobuf the journal entry
* @param entry the JournalEntry to protobuf
* @param buffer where to place the results
* @param max_buffer_size the amount of memory allocated for the buffer
* @param bytes_used the amount of the buffer used
* @returns true(1) on success, false(0) otherwise
*/
int ipfs_journal_entry_encode(struct JournalEntry* entry, uint8_t *buffer, size_t max_buffer_size, size_t *bytes_written) {
/*
message JournalEntry {
int32 timestamp = 1;
string hash = 2;
bool pin = 3;
}
*/
// sanity checks
if (buffer == NULL)
return 0;
if (max_buffer_size <= 0)
return 0;
*bytes_written = 0;
size_t bytes_used;
// timestamp
if (!protobuf_encode_varint(1, WIRETYPE_VARINT, entry->timestamp, &buffer[*bytes_written], max_buffer_size - *bytes_written, &bytes_used))
return 0;
*bytes_written += bytes_used;
// hash
if (!protobuf_encode_length_delimited(2, WIRETYPE_LENGTH_DELIMITED, (char*)entry->hash, entry->hash_size, &buffer[*bytes_written], max_buffer_size - *bytes_written, &bytes_used))
return 0;
*bytes_written += bytes_used;
// pin
if (!protobuf_encode_varint(3, WIRETYPE_VARINT, entry->pin, &buffer[*bytes_written], max_buffer_size - *bytes_written, &bytes_used))
return 0;
*bytes_written += bytes_used;
return 1;
}
/***
* Turn a protobuf'd JournalEntry and turn it into a real JournalEntry
* @param incoming the incoming bytes
* @param incoming_size the size of the incoming buffer
* @param results where to put the new JournalEntry
* @returns true(1) on success, false(0) otherwise
*/
int ipfs_journal_entry_decode(uint8_t *incoming, size_t incoming_size, struct JournalEntry **out) {
size_t pos = 0;
int retVal = 0, got_something = 0;;
if ( (*out = ipfs_journal_entry_new()) == NULL)
goto exit;
while(pos < incoming_size) {
size_t bytes_read = 0;
int field_no;
enum WireType field_type;
if (protobuf_decode_field_and_type(&incoming[pos], incoming_size, &field_no, &field_type, &bytes_read) == 0) {
goto exit;
}
if (field_no < 1 || field_no > 5) {
libp2p_logger_error("journal_entry", "Invalid character in journal_entry protobuf at position %lu. Value: %02x\n", pos, incoming[pos]);
}
pos += bytes_read;
switch(field_no) {
case (1): // timestamp
if (protobuf_decode_varint(&incoming[pos], incoming_size - pos, &(*out)->timestamp, &bytes_read) == 0)
goto exit;
pos += bytes_read;
got_something = 1;
break;
case (2): // hash
if (protobuf_decode_length_delimited(&incoming[pos], incoming_size - pos, (char**)&(*out)->hash, &(*out)->hash_size, &bytes_read) == 0)
goto exit;
pos += bytes_read;
got_something = 1;
break;
case (3): { // pin
unsigned long long temp;
if (protobuf_decode_varint(&incoming[pos], incoming_size - pos, &temp, &bytes_read) == 0)
goto exit;
(*out)->pin = (temp == 1);
pos += bytes_read;
got_something = 1;
break;
}
}
}
retVal = got_something;
exit:
if (retVal == 0) {
ipfs_journal_entry_free(*out);
}
return retVal;
}