gecko-dev/dom/base/MimeType.cpp

332 строки
9.0 KiB
C++

#include "MimeType.h"
#include "nsUnicharUtils.h"
namespace {
template<typename char_type>
static inline bool IsHTTPTokenPoint(const char_type c) {
return c == '!' || c == '#' || c == '$' || c == '%' || c == '&' ||
c == '\'' || c == '*' || c == '+' || c == '-' || c == '.' ||
c == '^' || c == '_' || c == '`' || c == '|' || c == '~' ||
mozilla::IsAsciiAlphanumeric(c);
}
template<typename char_type>
static inline bool IsHTTPQuotedStringTokenPoint(const char_type c) {
return c == 0x9 || (c >= ' ' && c <= '~') || mozilla::IsNonAsciiLatin1(c);
}
}
template<typename char_type>
/* static */ mozilla::UniquePtr<TMimeType<char_type>>
TMimeType<char_type>::Parse(const nsTSubstring<char_type>& aMimeType)
{
// See https://mimesniff.spec.whatwg.org/#parsing-a-mime-type
// Steps 1-2
const char_type* pos = aMimeType.BeginReading();
const char_type* end = aMimeType.EndReading();
while (pos < end && mozilla::IsAsciiWhitespace(*pos)) {
++pos;
}
if (pos == end) {
return nullptr;
}
while (end > pos && mozilla::IsAsciiWhitespace(*(end - 1))) {
--end;
}
// Steps 3-4
const char_type* typeStart = pos;
while (pos < end && *pos != '/') {
if (!IsHTTPTokenPoint(*pos)) {
return nullptr;
}
++pos;
}
const char_type* typeEnd = pos;
if (typeStart == typeEnd) {
return nullptr;
}
// Step 5
if (pos == end) {
return nullptr;
}
// Step 6
++pos;
// Step 7-9
const char_type* subtypeStart = pos;
const char_type* subtypeEnd = nullptr;
while (pos < end && *pos != ';') {
if (!IsHTTPTokenPoint(*pos)) {
// If we hit a whitespace, check that the rest of
// the subtype is whitespace, otherwise fail.
if (mozilla::IsAsciiWhitespace(*pos)) {
subtypeEnd = pos;
++pos;
while (pos < end && *pos != ';') {
if (!mozilla::IsAsciiWhitespace(*pos)) {
return nullptr;
}
++pos;
}
break;
}
return nullptr;
}
++pos;
}
if (subtypeEnd == nullptr) {
subtypeEnd = pos;
}
if (subtypeStart == subtypeEnd) {
return nullptr;
}
// Step 10
nsTString<char_type> type;
nsTString<char_type> subtype;
for (const char_type* c = typeStart; c < typeEnd; ++c) {
type.Append(ToLowerCaseASCII(*c));
}
for (const char_type* c = subtypeStart; c < subtypeEnd; ++c) {
subtype.Append(ToLowerCaseASCII(*c));
}
mozilla::UniquePtr<TMimeType<char_type>> mimeType(mozilla::MakeUnique<TMimeType<char_type>>(type, subtype));
// Step 11
while (pos < end) {
// Step 11.1
++pos;
// Step 11.2
while (pos < end && mozilla::IsAsciiWhitespace(*pos)) {
++pos;
}
// Steps 11.3 and 11.4
nsTString<char_type> paramName;
bool paramNameHadInvalidChars = false;
while (pos < end && *pos != ';' && *pos != '=') {
if (!IsHTTPTokenPoint(*pos)) {
paramNameHadInvalidChars = true;
}
paramName.Append(ToLowerCaseASCII(*pos));
++pos;
}
// Step 11.5
if (pos < end) {
if (*pos == ';') {
continue;
}
++pos;
}
// Step 11.6
if (pos == end) {
break;
}
// Step 11.7
ParameterValue paramValue;
bool paramValueHadInvalidChars = false;
// Step 11.8
if (*pos == '"') {
// Step 11.8.1
++pos;
// Step 11.8.2
while (true) {
// Step 11.8.2.1
while (pos < end && *pos != '"' && *pos != '\\') {
if (!IsHTTPQuotedStringTokenPoint(*pos)) {
paramValueHadInvalidChars = true;
}
if (!IsHTTPTokenPoint(*pos)) {
paramValue.mRequiresQuoting = true;
}
paramValue.Append(*pos);
++pos;
}
// Step 11.8.2.2
if (pos < end && *pos == '\\') {
// Step 11.8.2.2.1
++pos;
// Step 11.8.2.2.2
if (pos < end) {
if (!IsHTTPQuotedStringTokenPoint(*pos)) {
paramValueHadInvalidChars = true;
}
if (!IsHTTPTokenPoint(*pos)) {
paramValue.mRequiresQuoting = true;
}
paramValue.Append(*pos);
++pos;
continue;
}
// Step 11.8.2.2.3
paramValue.Append('\\');
paramValue.mRequiresQuoting = true;
}
// Step 11.8.2.3
break;
}
// Step 11.8.3
while (pos < end && *pos != ';') {
++pos;
}
// Step 11.9
} else {
// Step 11.9.1
const char_type* paramValueStart = pos;
while (pos < end && *pos != ';') {
++pos;
}
// Step 11.9.2
const char_type* paramValueLastChar = pos - 1;
while (paramValueLastChar >= paramValueStart &&
mozilla::IsAsciiWhitespace(*paramValueLastChar)) {
--paramValueLastChar;
}
// Step 11.9.3
if (paramValueStart > paramValueLastChar) {
continue;
}
for (const char_type* c = paramValueStart; c <= paramValueLastChar; ++c) {
if (!IsHTTPQuotedStringTokenPoint(*c)) {
paramValueHadInvalidChars = true;
}
if (!IsHTTPTokenPoint(*c)) {
paramValue.mRequiresQuoting = true;
}
paramValue.Append(*c);
}
}
// Step 11.10
if (!paramName.IsEmpty() && !paramNameHadInvalidChars &&
!paramValueHadInvalidChars &&
!mimeType->mParameters.Get(paramName, &paramValue)) {
mimeType->mParameters.Put(paramName, paramValue);
mimeType->mParameterNames.AppendElement(paramName);
}
}
// Step 12
return mimeType;
}
template<typename char_type>
void
TMimeType<char_type>::Serialize(nsTSubstring<char_type>& aOutput) const
{
aOutput.Assign(mType);
aOutput.AppendLiteral("/");
aOutput.Append(mSubtype);
for (uint32_t i = 0; i < mParameterNames.Length(); i++) {
auto name = mParameterNames[i];
aOutput.AppendLiteral(";");
aOutput.Append(name);
aOutput.AppendLiteral("=");
GetParameterValue(name, aOutput, true);
}
}
template<typename char_type>
void
TMimeType<char_type>::GetFullType(nsTSubstring<char_type>& aOutput) const
{
aOutput.Assign(mType);
aOutput.AppendLiteral("/");
aOutput.Append(mSubtype);
}
template<typename char_type>
bool
TMimeType<char_type>::HasParameter(const nsTSubstring<char_type>& aName) const
{
return mParameters.Get(aName, nullptr);
}
template<typename char_type>
bool
TMimeType<char_type>::GetParameterValue(const nsTSubstring<char_type>& aName,
nsTSubstring<char_type>& aOutput,
bool aAppend) const
{
if (!aAppend) {
aOutput.Truncate();
}
ParameterValue value;
if (!mParameters.Get(aName, &value)) {
return false;
}
if (value.mRequiresQuoting || value.IsEmpty()) {
aOutput.AppendLiteral("\"");
const char_type* vcur = value.BeginReading();
const char_type* vend = value.EndReading();
while (vcur < vend) {
if (*vcur == '"' || *vcur == '\\') {
aOutput.AppendLiteral("\\");
}
aOutput.Append(*vcur);
vcur++;
}
aOutput.AppendLiteral("\"");
} else {
aOutput.Append(value);
}
return true;
}
template<typename char_type>
void
TMimeType<char_type>::SetParameterValue(const nsTSubstring<char_type>& aName,
const nsTSubstring<char_type>& aValue)
{
if (!mParameters.Get(aName, nullptr)) {
mParameterNames.AppendElement(aName);
}
ParameterValue value;
value.Append(aValue);
mParameters.Put(aName, value);
}
template mozilla::UniquePtr<TMimeType<char16_t>> TMimeType<char16_t>::Parse(const nsTSubstring<char16_t>& aMimeType);
template mozilla::UniquePtr<TMimeType<char>> TMimeType<char>::Parse(const nsTSubstring<char>& aMimeType);
template void TMimeType<char16_t>::Serialize(nsTSubstring<char16_t>& aOutput) const;
template void TMimeType<char>::Serialize(nsTSubstring<char>& aOutput) const;
template void TMimeType<char16_t>::GetFullType(nsTSubstring<char16_t>& aOutput) const;
template void TMimeType<char>::GetFullType(nsTSubstring<char>& aOutput) const;
template bool TMimeType<char16_t>::HasParameter(const nsTSubstring<char16_t>& aName) const;
template bool TMimeType<char>::HasParameter(const nsTSubstring<char>& aName) const;
template bool TMimeType<char16_t>::GetParameterValue(const nsTSubstring<char16_t>& aName,
nsTSubstring<char16_t>& aOutput,
bool aAppend) const;
template bool TMimeType<char>::GetParameterValue(const nsTSubstring<char>& aName,
nsTSubstring<char>& aOutput,
bool aAppend) const;
template void TMimeType<char16_t>::SetParameterValue(const nsTSubstring<char16_t>& aName,
const nsTSubstring<char16_t>& aValue);
template void TMimeType<char>::SetParameterValue(const nsTSubstring<char>& aName,
const nsTSubstring<char>& aValue);