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