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#include "encode.h"
#include <util/generic/singleton.h>
namespace NUri {
namespace NEncode {
// http://tools.ietf.org/html/rfc3986#section-2.2
#define GENDELIMS0 ":/?#[]@"
#define SUBDELIMS0 "!$&'()*+,;="
// http://tools.ietf.org/html/rfc3986#section-2.3
#define UNRESERVED "-._~"
// now find subsets which can sometimes be decoded
// remove '#' which can't ever be decoded
// don't mark anything allowed for pass (pass is completely encoded)
// safe in path, qry, frag, hashbang
#define GENDELIMS1 ":@"
// allowed in qry, frag, hashbang
#define GENDELIMS2 "/?"
// qry-unsafe chars
#define SUBDELIMS1 "&+=;"
// rest allowed in qry, frag, hashbang
#define SUBDELIMS2 "!$'()*,"
const TEncoder::TGrammar& TEncoder::Grammar() {
return *Singleton<TEncoder::TGrammar>();
}
// initialize the grammar map
TEncoder::TGrammar::TGrammar() {
// first set up unreserved characters safe in any field
const ui64 featUnres = TFeature::FeatureDecodeUnreserved;
AddRng('0', '9', ECFDigit, featUnres);
AddRng('A', 'Z', ECFUpper, featUnres | TFeature::FeatureToLower);
AddRng('a', 'z', ECFLower, featUnres);
Add(UNRESERVED, ECFUnres, featUnres);
// XXX: standard "safe" set used previously "-_.!~*();/:@$,", with comment:
// alnum + reserved + mark + ( '[', ']') - ('=' '+' '&' '\'' '"' '\\' '?')
Add("!*();/:@$,", ECFStdrd, TFeature::FeatureDecodeStandardExtra);
// now field-specific subsets of reserved characters (gen-delims + sub-delims)
const ui64 featSafe = TFeature::FeatureDecodeFieldAllowed;
Add(GENDELIMS1, 0, featSafe, TField::FlagPath | TField::FlagQuery | TField::FlagFrag | TField::FlagHashBang);
Add(GENDELIMS2, 0, featSafe, TField::FlagQuery | TField::FlagFrag | TField::FlagHashBang);
Add(SUBDELIMS1, 0, featSafe, TField::FlagUser);
Add(SUBDELIMS2, 0, featSafe, TField::FlagUser | TField::FlagQuery | TField::FlagFrag | TField::FlagHashBang);
// control chars
AddRng(0x00, 0x20, TFeature::FeatureEncodeCntrl);
Add(0x7f, TFeature::FeatureEncodeCntrl);
// '%' starts a percent-encoded sequence
Add('%', TFeature::FeatureDecodeANY | TFeature::FeatureEncodePercent);
// extended ASCII
AddRng(128, 255, TFeature::FeatureEncodeExtendedASCII | TFeature::FeatureDecodeExtendedASCII);
// extended delims
Add("\"<>[\\]^`{|}", TFeature::FeatureEncodeExtendedDelim | TFeature::FeatureDecodeExtendedDelim);
// add characters with other features
Add(' ', TFeature::FeatureEncodeSpace | TFeature::FeatureEncodeSpaceAsPlus);
Add("'\"\\", TFeature::FeatureEncodeForSQL);
GetMutable(':').EncodeFld |= TField::FlagUser | TField::FlagHashBang;
GetMutable('?').EncodeFld |= TField::FlagPath | TField::FlagHashBang;
GetMutable('#').EncodeFld |= TField::FlagPath | TField::FlagQuery | TField::FlagHashBang;
GetMutable('&').EncodeFld |= TField::FlagQuery | TField::FlagHashBang;
GetMutable('+').EncodeFld |= TField::FlagQuery | TField::FlagHashBang;
}
// should we decode an encoded character
bool TCharFlags::IsDecode(ui32 fldmask, ui64 flags) const {
const ui64 myflags = flags & FeatFlags;
if (myflags & TFeature::FeaturesEncode)
return false;
if (myflags & TFeature::FeaturesDecode)
return true;
return (fldmask & DecodeFld) && (flags & TFeature::FeatureDecodeFieldAllowed);
}
const int dD = 'a' - 'A';
int TEncodeMapper::EncodeSym(unsigned char& ch) const {
const TCharFlags& chflags = TEncoder::GetFlags(ch);
const ui64 flags = Flags & chflags.FeatFlags;
if (flags & TFeature::FeatureToLower)
ch += dD;
if (Q_DecodeAny)
return -1;
if (flags & TFeature::FeaturesEncode)
return 1;
if (' ' == ch) {
if (Q_EncodeSpcAsPlus)
ch = '+';
return 0;
}
return 0;
}
int TEncodeMapper::EncodeHex(unsigned char& ch) const {
const TCharFlags& chflags = TEncoder::GetFlags(ch);
const ui64 flags = Flags & chflags.FeatFlags;
if (flags & TFeature::FeatureToLower)
ch += dD;
if (Q_DecodeAny)
return -1;
if (chflags.IsDecode(FldMask, Flags))
return 0;
if (' ' == ch) {
if (!Q_EncodeSpcAsPlus)
return 1;
ch = '+';
return 0;
}
return 1;
}
bool TEncodeToMapper::Encode(unsigned char ch) const {
if (Q_DecodeAny)
return false;
const TCharFlags& chflags = TEncoder::GetFlags(ch);
if (FldMask & chflags.EncodeFld)
return true;
const ui64 flags = Flags & chflags.FeatFlags;
return (flags & TFeature::FeaturesEncode);
}
TEncoder::TEncoder(IOutputStream& out, const TEncodeMapper& fldsrc, const TEncodeToMapper& flddst)
: Out(out)
, FldSrc(fldsrc)
, FldDst(flddst)
, OutFlags(0)
, HexValue(0)
{
}
IOutputStream& TEncoder::Hex(IOutputStream& out, unsigned char val) {
static const char sHexCodes[] = "0123456789ABCDEF";
return out << sHexCodes[(val >> 4) & 0xF] << sHexCodes[val & 0xF];
}
IOutputStream& TEncoder::EncodeAll(IOutputStream& out, const TStringBuf& val) {
for (size_t i = 0; i != val.length(); ++i)
Encode(out, val[i]);
return out;
}
IOutputStream& TEncoder::EncodeNotAlnum(IOutputStream& out, const TStringBuf& val) {
for (size_t i = 0; i != val.length(); ++i) {
const char c = val[i];
if (IsAlnum(c))
out << c;
else
Encode(out, c);
}
return out;
}
IOutputStream& TEncoder::EncodeField(
IOutputStream& out, const TStringBuf& val, TField::EField fld) {
const ui32 fldmask = ui32(1) << fld;
for (size_t i = 0; i != val.length(); ++i) {
const char ch = val[i];
if (GetFlags(ch).IsAllowed(fldmask))
out << ch;
else
Encode(out, ch);
}
return out;
}
IOutputStream& TEncoder::EncodeField(
IOutputStream& out, const TStringBuf& val, TField::EField fld, ui64 flags) {
const ui32 fldmask = ui32(1) << fld;
for (size_t i = 0; i != val.length(); ++i) {
const char ch = val[i];
if (GetFlags(ch).IsDecode(fldmask, flags))
out << ch;
else
Encode(out, ch);
}
return out;
}
void TEncoder::Do(unsigned char ch, int res) {
OutFlags |= GetFlags(ch).FeatFlags;
bool escapepct = false;
if (0 < res) // definitely encode
escapepct = FldDst.Enabled() && !FldDst.Is(TField::FieldHashBang);
else if (0 != res || !FldDst.Enabled() || !FldDst.Encode(ch)) {
Out << ch;
return;
}
Out << '%';
if (escapepct) {
Out.Write("25", 2); // '%'
}
Hex(Out, ch);
}
}
}
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