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+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef APR_XLATE_H
+#define APR_XLATE_H
+
+#include "apu.h"
+#include "apr_pools.h"
+#include "apr_errno.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/**
+ * @file apr_xlate.h
+ * @brief APR I18N translation library
+ */
+
+/**
+ * @defgroup APR_XLATE I18N translation library
+ * @ingroup APR
+ * @{
+ */
+/** Opaque translation buffer */
+typedef struct apr_xlate_t apr_xlate_t;
+
+/**
+ * Set up for converting text from one charset to another.
+ * @param convset The handle to be filled in by this function
+ * @param topage The name of the target charset
+ * @param frompage The name of the source charset
+ * @param pool The pool to use
+ * @remark
+ * Specify APR_DEFAULT_CHARSET for one of the charset
+ * names to indicate the charset of the source code at
+ * compile time. This is useful if there are literal
+ * strings in the source code which must be translated
+ * according to the charset of the source code.
+ * APR_DEFAULT_CHARSET is not useful if the source code
+ * of the caller was not encoded in the same charset as
+ * APR at compile time.
+ *
+ * @remark
+ * Specify APR_LOCALE_CHARSET for one of the charset
+ * names to indicate the charset of the current locale.
+ *
+ * @remark
+ * Return APR_EINVAL if unable to procure a convset, or APR_ENOTIMPL
+ * if charset transcoding is not available in this instance of
+ * apr-util at all (i.e., APR_HAS_XLATE is undefined).
+ */
+APU_DECLARE(apr_status_t) apr_xlate_open(apr_xlate_t **convset,
+ const char *topage,
+ const char *frompage,
+ apr_pool_t *pool);
+
+/**
+ * This is to indicate the charset of the sourcecode at compile time
+ * names to indicate the charset of the source code at
+ * compile time. This is useful if there are literal
+ * strings in the source code which must be translated
+ * according to the charset of the source code.
+ */
+#define APR_DEFAULT_CHARSET (const char *)0
+/**
+ * To indicate charset names of the current locale
+ */
+#define APR_LOCALE_CHARSET (const char *)1
+
+/**
+ * Find out whether or not the specified conversion is single-byte-only.
+ * @param convset The handle allocated by apr_xlate_open, specifying the
+ * parameters of conversion
+ * @param onoff Output: whether or not the conversion is single-byte-only
+ * @remark
+ * Return APR_ENOTIMPL if charset transcoding is not available
+ * in this instance of apr-util (i.e., APR_HAS_XLATE is undefined).
+ */
+APU_DECLARE(apr_status_t) apr_xlate_sb_get(apr_xlate_t *convset, int *onoff);
+
+/**
+ * Convert a buffer of text from one codepage to another.
+ * @param convset The handle allocated by apr_xlate_open, specifying
+ * the parameters of conversion
+ * @param inbuf The address of the source buffer
+ * @param inbytes_left Input: the amount of input data to be translated
+ * Output: the amount of input data not yet translated
+ * @param outbuf The address of the destination buffer
+ * @param outbytes_left Input: the size of the output buffer
+ * Output: the amount of the output buffer not yet used
+ * @remark
+ * Returns APR_ENOTIMPL if charset transcoding is not available
+ * in this instance of apr-util (i.e., APR_HAS_XLATE is undefined).
+ * Returns APR_INCOMPLETE if the input buffer ends in an incomplete
+ * multi-byte character.
+ *
+ * To correctly terminate the output buffer for some multi-byte
+ * character set encodings, a final call must be made to this function
+ * after the complete input string has been converted, passing
+ * the inbuf and inbytes_left parameters as NULL. (Note that this
+ * mode only works from version 1.1.0 onwards)
+ */
+APU_DECLARE(apr_status_t) apr_xlate_conv_buffer(apr_xlate_t *convset,
+ const char *inbuf,
+ apr_size_t *inbytes_left,
+ char *outbuf,
+ apr_size_t *outbytes_left);
+
+/* @see apr_file_io.h the comment in apr_file_io.h about this hack */
+#ifdef APR_NOT_DONE_YET
+/**
+ * The purpose of apr_xlate_conv_char is to translate one character
+ * at a time. This needs to be written carefully so that it works
+ * with double-byte character sets.
+ * @param convset The handle allocated by apr_xlate_open, specifying the
+ * parameters of conversion
+ * @param inchar The character to convert
+ * @param outchar The converted character
+ */
+APU_DECLARE(apr_status_t) apr_xlate_conv_char(apr_xlate_t *convset,
+ char inchar, char outchar);
+#endif
+
+/**
+ * Convert a single-byte character from one charset to another.
+ * @param convset The handle allocated by apr_xlate_open, specifying the
+ * parameters of conversion
+ * @param inchar The single-byte character to convert.
+ * @warning This only works when converting between single-byte character sets.
+ * -1 will be returned if the conversion can't be performed.
+ */
+APU_DECLARE(apr_int32_t) apr_xlate_conv_byte(apr_xlate_t *convset,
+ unsigned char inchar);
+
+/**
+ * Close a codepage translation handle.
+ * @param convset The codepage translation handle to close
+ * @remark
+ * Return APR_ENOTIMPL if charset transcoding is not available
+ * in this instance of apr-util (i.e., APR_HAS_XLATE is undefined).
+ */
+APU_DECLARE(apr_status_t) apr_xlate_close(apr_xlate_t *convset);
+
+/** @} */
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ! APR_XLATE_H */