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apr_xlate.h
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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 */