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Crow/include/query_string.h
Bryce Anderson 243995f36f Fix memory error and invalid param when no params are present 
Also added a unit test that fails with the previous behavior.
Note that `-fsanitize=address` exposes the invalid memory access in
qs_parse.
2015-04-30 20:56:28 -04:00

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#pragma once
#include <stdio.h>
#include <string.h>
#include <string>
#include <vector>
#include <iostream>
// ----------------------------------------------------------------------------
// qs_parse (modified)
// https://github.com/bartgrantham/qs_parse
// ----------------------------------------------------------------------------
/* Similar to strncmp, but handles URL-encoding for either string */
int qs_strncmp(const char * s, const char * qs, size_t n);
/* Finds the beginning of each key/value pair and stores a pointer in qs_kv.
* Also decodes the value portion of the k/v pair *in-place*. In a future
* enhancement it will also have a compile-time option of sorting qs_kv
* alphabetically by key. */
int qs_parse(char * qs, char * qs_kv[], int qs_kv_size);
/* Used by qs_parse to decode the value portion of a k/v pair */
int qs_decode(char * qs);
/* Looks up the value according to the key on a pre-processed query string
* A future enhancement will be a compile-time option to look up the key
* in a pre-sorted qs_kv array via a binary search. */
//char * qs_k2v(const char * key, char * qs_kv[], int qs_kv_size);
char * qs_k2v(const char * key, char * const * qs_kv, int qs_kv_size, int nth);
/* Non-destructive lookup of value, based on key. User provides the
* destinaton string and length. */
char * qs_scanvalue(const char * key, const char * qs, char * val, size_t val_len);
// TODO: implement sorting of the qs_kv array; for now ensure it's not compiled
#undef _qsSORTING
// isxdigit _is_ available in <ctype.h>, but let's avoid another header instead
#define CROW_QS_ISHEX(x) ((((x)>='0'&&(x)<='9') || ((x)>='A'&&(x)<='F') || ((x)>='a'&&(x)<='f')) ? 1 : 0)
#define CROW_QS_HEX2DEC(x) (((x)>='0'&&(x)<='9') ? (x)-48 : ((x)>='A'&&(x)<='F') ? (x)-55 : ((x)>='a'&&(x)<='f') ? (x)-87 : 0)
#define CROW_QS_ISQSCHR(x) ((((x)=='=')||((x)=='#')||((x)=='&')||((x)=='\0')) ? 0 : 1)
inline int qs_strncmp(const char * s, const char * qs, size_t n)
{
int i=0;
unsigned char u1, u2, unyb, lnyb;
while(n-- > 0)
{
u1 = (unsigned char) *s++;
u2 = (unsigned char) *qs++;
if ( ! CROW_QS_ISQSCHR(u1) ) { u1 = '\0'; }
if ( ! CROW_QS_ISQSCHR(u2) ) { u2 = '\0'; }
if ( u1 == '+' ) { u1 = ' '; }
if ( u1 == '%' ) // easier/safer than scanf
{
unyb = (unsigned char) *s++;
lnyb = (unsigned char) *s++;
if ( CROW_QS_ISHEX(unyb) && CROW_QS_ISHEX(lnyb) )
u1 = (CROW_QS_HEX2DEC(unyb) * 16) + CROW_QS_HEX2DEC(lnyb);
else
u1 = '\0';
}
if ( u2 == '+' ) { u2 = ' '; }
if ( u2 == '%' ) // easier/safer than scanf
{
unyb = (unsigned char) *qs++;
lnyb = (unsigned char) *qs++;
if ( CROW_QS_ISHEX(unyb) && CROW_QS_ISHEX(lnyb) )
u2 = (CROW_QS_HEX2DEC(unyb) * 16) + CROW_QS_HEX2DEC(lnyb);
else
u2 = '\0';
}
if ( u1 != u2 )
return u1 - u2;
if ( u1 == '\0' )
return 0;
i++;
}
if ( CROW_QS_ISQSCHR(*qs) )
return -1;
else
return 0;
}
inline int qs_parse(char * qs, char * qs_kv[], int qs_kv_size)
{
int i, j;
char * substr_ptr;
for(i=0; i<qs_kv_size; i++) qs_kv[i] = NULL;
// find the beginning of the k/v substrings or the fragment
substr_ptr = qs + strcspn(qs, "?#");
if (substr_ptr[0] != '\0')
substr_ptr++;
else
return 0; // no query or fragment
i=0;
while(i<qs_kv_size)
{
qs_kv[i] = substr_ptr;
j = strcspn(substr_ptr, "&");
if ( substr_ptr[j] == '\0' ) { break; }
substr_ptr += j + 1;
i++;
}
i++; // x &'s -> means x iterations of this loop -> means *x+1* k/v pairs
// we only decode the values in place, the keys could have '='s in them
// which will hose our ability to distinguish keys from values later
for(j=0; j<i; j++)
{
substr_ptr = qs_kv[j] + strcspn(qs_kv[j], "=&#");
if ( substr_ptr[0] == '&' || substr_ptr[0] == '\0') // blank value: skip decoding
substr_ptr[0] = '\0';
else
qs_decode(++substr_ptr);
}
#ifdef _qsSORTING
// TODO: qsort qs_kv, using qs_strncmp() for the comparison
#endif
return i;
}
inline int qs_decode(char * qs)
{
int i=0, j=0;
while( CROW_QS_ISQSCHR(qs[j]) )
{
if ( qs[j] == '+' ) { qs[i] = ' '; }
else if ( qs[j] == '%' ) // easier/safer than scanf
{
if ( ! CROW_QS_ISHEX(qs[j+1]) || ! CROW_QS_ISHEX(qs[j+2]) )
{
qs[i] = '\0';
return i;
}
qs[i] = (CROW_QS_HEX2DEC(qs[j+1]) * 16) + CROW_QS_HEX2DEC(qs[j+2]);
j+=2;
}
else
{
qs[i] = qs[j];
}
i++; j++;
}
qs[i] = '\0';
return i;
}
inline char * qs_k2v(const char * key, char * const * qs_kv, int qs_kv_size, int nth = 0)
{
int i;
size_t key_len, skip;
key_len = strlen(key);
#ifdef _qsSORTING
// TODO: binary search for key in the sorted qs_kv
#else // _qsSORTING
for(i=0; i<qs_kv_size; i++)
{
// we rely on the unambiguous '=' to find the value in our k/v pair
if ( qs_strncmp(key, qs_kv[i], key_len) == 0 )
{
skip = strcspn(qs_kv[i], "=");
if ( qs_kv[i][skip] == '=' )
skip++;
// return (zero-char value) ? ptr to trailing '\0' : ptr to value
if(nth == 0)
return qs_kv[i] + skip;
else
--nth;
}
}
#endif // _qsSORTING
return NULL;
}
inline char * qs_scanvalue(const char * key, const char * qs, char * val, size_t val_len)
{
size_t i, key_len;
const char * tmp;
// find the beginning of the k/v substrings
if ( (tmp = strchr(qs, '?')) != NULL )
qs = tmp + 1;
key_len = strlen(key);
while(qs[0] != '#' && qs[0] != '\0')
{
if ( qs_strncmp(key, qs, key_len) == 0 )
break;
qs += strcspn(qs, "&") + 1;
}
if ( qs[0] == '\0' ) return NULL;
qs += strcspn(qs, "=&#");
if ( qs[0] == '=' )
{
qs++;
i = strcspn(qs, "&=#");
strncpy(val, qs, (val_len-1)<(i+1) ? (val_len-1) : (i+1));
qs_decode(val);
}
else
{
if ( val_len > 0 )
val[0] = '\0';
}
return val;
}
// ----------------------------------------------------------------------------
namespace crow
{
class query_string
{
public:
static const int MAX_KEY_VALUE_PAIRS_COUNT = 256;
query_string()
{
}
query_string(const query_string& qs)
: url_(qs.url_)
{
for(auto p:qs.key_value_pairs_)
{
key_value_pairs_.push_back((char*)(p-qs.url_.c_str()+url_.c_str()));
}
}
query_string& operator = (const query_string& qs)
{
url_ = qs.url_;
key_value_pairs_.clear();
for(auto p:qs.key_value_pairs_)
{
key_value_pairs_.push_back((char*)(p-qs.url_.c_str()+url_.c_str()));
}
return *this;
}
query_string& operator = (query_string&& qs)
{
key_value_pairs_ = std::move(qs.key_value_pairs_);
char* old_data = (char*)qs.url_.c_str();
url_ = std::move(qs.url_);
for(auto& p:key_value_pairs_)
{
p += (char*)url_.c_str() - old_data;
}
return *this;
}
query_string(std::string url)
: url_(std::move(url))
{
if (url_.empty())
return;
key_value_pairs_.resize(MAX_KEY_VALUE_PAIRS_COUNT);
int count = qs_parse(&url_[0], &key_value_pairs_[0], MAX_KEY_VALUE_PAIRS_COUNT);
key_value_pairs_.resize(count);
}
void clear()
{
key_value_pairs_.clear();
url_.clear();
}
friend std::ostream& operator<<(std::ostream& os, const query_string& qs)
{
os << "[ ";
for(size_t i = 0; i < qs.key_value_pairs_.size(); ++i) {
if (i)
os << ", ";
os << qs.key_value_pairs_[i];
}
os << " ]";
return os;
}
char* get (const std::string& name) const
{
char* ret = qs_k2v(name.c_str(), key_value_pairs_.data(), key_value_pairs_.size());
return ret;
}
std::vector<char*> get_list (const std::string& name) const
{
std::vector<char*> ret;
std::string plus = name + "[]";
char* element = nullptr;
int count = 0;
while(1)
{
element = qs_k2v(plus.c_str(), key_value_pairs_.data(), key_value_pairs_.size(), count++);
if (!element)
break;
ret.push_back(element);
}
return ret;
}
private:
std::string url_;
std::vector<char*> key_value_pairs_;
};
} // end namespace
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