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- // Copyright 2013 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- // ICU-based character set converter.
- #include <stdint.h>
- #include <stdlib.h>
- #include <string.h>
- #include "base/check.h"
- #include "base/memory/raw_ptr.h"
- #include "third_party/icu/source/common/unicode/ucnv.h"
- #include "third_party/icu/source/common/unicode/ucnv_cb.h"
- #include "third_party/icu/source/common/unicode/utypes.h"
- #include "url/url_canon_icu.h"
- #include "url/url_canon_internal.h" // for _itoa_s
- namespace url {
- namespace {
- // Called when converting a character that can not be represented, this will
- // append an escaped version of the numerical character reference for that code
- // point. It is of the form "Ӓ" and we will escape the non-digits to
- // "%26%231234%3B". Why? This is what Netscape did back in the olden days.
- void appendURLEscapedChar(const void* context,
- UConverterFromUnicodeArgs* from_args,
- const UChar* code_units,
- int32_t length,
- UChar32 code_point,
- UConverterCallbackReason reason,
- UErrorCode* err) {
- if (reason == UCNV_UNASSIGNED) {
- *err = U_ZERO_ERROR;
- const static int prefix_len = 6;
- const static char prefix[prefix_len + 1] = "%26%23"; // "&#" percent-escaped
- ucnv_cbFromUWriteBytes(from_args, prefix, prefix_len, 0, err);
- DCHECK(code_point < 0x110000);
- char number[8]; // Max Unicode code point is 7 digits.
- _itoa_s(code_point, number, 10);
- int number_len = static_cast<int>(strlen(number));
- ucnv_cbFromUWriteBytes(from_args, number, number_len, 0, err);
- const static int postfix_len = 3;
- const static char postfix[postfix_len + 1] = "%3B"; // ";" percent-escaped
- ucnv_cbFromUWriteBytes(from_args, postfix, postfix_len, 0, err);
- }
- }
- // A class for scoping the installation of the invalid character callback.
- class AppendHandlerInstaller {
- public:
- // The owner of this object must ensure that the converter is alive for the
- // duration of this object's lifetime.
- AppendHandlerInstaller(UConverter* converter) : converter_(converter) {
- UErrorCode err = U_ZERO_ERROR;
- ucnv_setFromUCallBack(converter_, appendURLEscapedChar, 0,
- &old_callback_, &old_context_, &err);
- }
- ~AppendHandlerInstaller() {
- UErrorCode err = U_ZERO_ERROR;
- ucnv_setFromUCallBack(converter_, old_callback_, old_context_, 0, 0, &err);
- }
- private:
- raw_ptr<UConverter> converter_;
- UConverterFromUCallback old_callback_;
- const void* old_context_;
- };
- } // namespace
- ICUCharsetConverter::ICUCharsetConverter(UConverter* converter)
- : converter_(converter) {
- }
- ICUCharsetConverter::~ICUCharsetConverter() = default;
- void ICUCharsetConverter::ConvertFromUTF16(const char16_t* input,
- int input_len,
- CanonOutput* output) {
- // Install our error handler. It will be called for character that can not
- // be represented in the destination character set.
- AppendHandlerInstaller handler(converter_);
- int begin_offset = output->length();
- int dest_capacity = output->capacity() - begin_offset;
- output->set_length(output->length());
- do {
- UErrorCode err = U_ZERO_ERROR;
- char* dest = &output->data()[begin_offset];
- int required_capacity = ucnv_fromUChars(converter_, dest, dest_capacity,
- input, input_len, &err);
- if (err != U_BUFFER_OVERFLOW_ERROR) {
- output->set_length(begin_offset + required_capacity);
- return;
- }
- // Output didn't fit, expand
- dest_capacity = required_capacity;
- output->Resize(begin_offset + dest_capacity);
- } while (true);
- }
- } // namespace url
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