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/*
**********************************************************************************************
* File: http_decoder_string.h
* Description:
* Authors: LuWenPeng <[email protected]>
* Date: 2022-10-31
* Copyright: (c) Since 2022 Geedge Networks, Ltd. All rights reserved.
***********************************************************************************************
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "stellar/utils.h"
#include "http_decoder_utils.h"
#include "http_decoder_string.h"
static const char *string_state_to_desc(enum string_state state)
{
switch (state) {
case STRING_STATE_INIT:
return "init";
break;
case STRING_STATE_REFER:
return "refer";
break;
case STRING_STATE_CACHE:
return "cache";
break;
case STRING_STATE_COMMIT:
return "commit";
break;
default:
return "unknown";
break;
}
}
void http_decoder_string_refer(struct http_decoder_string *rstr,
const char *at, size_t length)
{
if (NULL == rstr) {
return;
}
switch (rstr->state) {
case STRING_STATE_INIT:
case STRING_STATE_CACHE:
rstr->refer.str = (char *)at;
rstr->refer.str_len = length;
break;
default:
abort();
break;
}
rstr->state = STRING_STATE_REFER;
}
static void string_refer2cache(struct http_decoder_string *rstr)
{
if (0 == rstr->refer.str_len) {
return;
}
if (rstr->cache.str_len >= rstr->max_cache_size) {
return;
}
size_t length = rstr->cache.str_len + rstr->refer.str_len;
if (length > rstr->max_cache_size) {
length = rstr->max_cache_size;
}
if (NULL == rstr->cache.str) {
rstr->cache.str = CALLOC(char, length + 1);
memcpy(rstr->cache.str, rstr->refer.str, length);
} else {
rstr->cache.str = REALLOC(char, rstr->cache.str, length + 1);
memcpy(rstr->cache.str + rstr->cache.str_len, rstr->refer.str,
(length - rstr->cache.str_len));
}
rstr->cache.str_len = length;
rstr->refer.str = NULL;
rstr->refer.str_len = 0;
}
static void string_commit2cache(struct http_decoder_string *rstr)
{
if (rstr->cache.str_len == rstr->commit.str_len &&
rstr->cache.str == rstr->commit.str) {
rstr->commit.str = NULL;
rstr->commit.str_len = 0;
return;
}
//Only http header key need to backward to cache
size_t length = 0;
if (rstr->commit.str_len > rstr->max_cache_size) {
length = rstr->max_cache_size;
} else {
length = rstr->commit.str_len;
}
if (length > 0) {
if (NULL == rstr->cache.str) {
rstr->cache.str = CALLOC(char, length + 1);
} else {
abort();
}
memcpy(rstr->cache.str, rstr->commit.str, length);
rstr->cache.str_len = length;
rstr->commit.str = NULL;
rstr->commit.str_len = 0;
}
}
void http_decoder_string_cache(struct http_decoder_string *rstr)
{
if (NULL == rstr) {
return;
}
switch (rstr->state) {
case STRING_STATE_REFER:
string_refer2cache(rstr);
break;
case STRING_STATE_CACHE:
break;
case STRING_STATE_COMMIT:
//commit backward to cache
string_commit2cache(rstr);
break;
default:
abort();
break;
}
rstr->state = STRING_STATE_CACHE;
}
void http_decoder_string_commit(struct http_decoder_string *rstr)
{
if (NULL == rstr) {
return;
}
switch (rstr->state) {
case STRING_STATE_REFER:
if (rstr->cache.str_len) {
http_decoder_string_cache(rstr);
rstr->commit.str = rstr->cache.str;
rstr->commit.str_len = rstr->cache.str_len;
// not overwrite rstr->cache.str
} else {
rstr->commit.str = rstr->refer.str;
rstr->commit.str_len = rstr->refer.str_len;
rstr->refer.str = NULL;
rstr->refer.str_len = 0;
}
break;
case STRING_STATE_CACHE:
rstr->commit.str = rstr->cache.str;
rstr->commit.str_len = rstr->cache.str_len;
// not overwrite rstr->cache.str
break;
default:
//abort();
break;
}
rstr->state = STRING_STATE_COMMIT;
}
void http_decoder_string_reset(struct http_decoder_string *rstr)
{
assert(rstr);
switch (rstr->state) {
case STRING_STATE_INIT:
case STRING_STATE_REFER:
case STRING_STATE_CACHE:
case STRING_STATE_COMMIT:
FREE(rstr->cache.str);
memset(rstr, 0, sizeof(struct http_decoder_string));
break;
default:
abort();
break;
}
rstr->state = STRING_STATE_INIT;
}
void http_decoder_string_init(struct http_decoder_string *rstr,
size_t max_cache_size)
{
rstr->max_cache_size = max_cache_size;
}
void http_decoder_string_reinit(struct http_decoder_string *rstr)
{
if (rstr->state == STRING_STATE_CACHE) {
return;
}
if (rstr->state == STRING_STATE_COMMIT &&
rstr->cache.str == rstr->commit.str &&
rstr->cache.str_len == rstr->commit.str_len) {
return;
}
if (rstr->cache.str != NULL) {
FREE(rstr->cache.str);
rstr->cache.str_len = 0;
}
rstr->refer.str = NULL;
rstr->refer.str_len = 0;
rstr->commit.str = NULL;
rstr->commit.str_len = 0;
rstr->state = STRING_STATE_INIT;
}
enum string_state http_decoder_string_state(struct http_decoder_string *rstr)
{
return rstr->state;
}
int http_decoder_string_get(struct http_decoder_string *rstr, struct hstring *out)
{
if (NULL == rstr || NULL == out) {
return -1;
}
if (http_decoder_string_state(rstr) == STRING_STATE_COMMIT) {
out->str = rstr->commit.str;
out->str_len = rstr->commit.str_len;
} else {
out->str = NULL;
out->str_len = 0;
}
return 0;
}
void http_decoder_string_dump(struct http_decoder_string *rstr, const char *desc)
{
if (NULL == rstr) {
return;
}
char *refer_str = safe_dup(rstr->refer.str, rstr->refer.str_len);
char *cache_str = safe_dup(rstr->cache.str, rstr->cache.str_len);
char *commit_str = safe_dup(rstr->commit.str, rstr->commit.str_len);
printf("%s: state: %s, refer: {len: %02zu, str: %s}, cache: {len: %02zu, str: %s}, commit: {len: %02zu, str: %s}\n",
desc, string_state_to_desc(rstr->state),
rstr->refer.str_len, refer_str,
rstr->cache.str_len, cache_str,
rstr->commit.str_len, commit_str);
FREE(refer_str);
FREE(cache_str);
FREE(commit_str);
}
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