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/*
* Copyright (C) 2020 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2020 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-runtime-lib
* Created on: 8 мар. 2019 г.
*
* lsp-runtime-lib is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* lsp-runtime-lib is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with lsp-runtime-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef LSP_PLUG_IN_IO_CHARSETENCODER_H_
#define LSP_PLUG_IN_IO_CHARSETENCODER_H_
#include <lsp-plug.in/runtime/version.h>
#include <lsp-plug.in/common/status.h>
#include <lsp-plug.in/io/charset.h>
#include <lsp-plug.in/io/File.h>
#include <lsp-plug.in/io/IInSequence.h>
#include <lsp-plug.in/io/IOutStream.h>
namespace lsp
{
namespace io
{
/**
* Character set encoder, from UTF-32 to any character set
* Important! fetch() operations do not always return blocks
* aligned to the character range.
*/
class CharsetEncoder
{
protected:
uint8_t *bBuffer; // Temporary buffer for storing input byte sequence
uint8_t *bBufHead; // Buffer head
uint8_t *bBufTail; // Buffer tail
lsp_wchar_t *cBuffer; // Temporary buffer for storing UTF-16 code points
lsp_wchar_t *cBufHead; // Character buffer head
lsp_wchar_t *cBufTail; // Character buffer tail
#if defined(PLATFORM_WINDOWS)
lsp_utf16_t *xBuffer; // Additional translation buffer
UINT nCodePage; // Code page
#else
iconv_t hIconv; // iconv handle
#endif /* PLATFORM_WINDOWS */
private:
CharsetEncoder &operator = (const CharsetEncoder &); // Prevent from copying
inline size_t prepare_buffer();
ssize_t encode_buffer();
public:
explicit CharsetEncoder();
~CharsetEncoder();
public:
/**
* Initialize character-set decoder
* @param charset character set name, NULL for default native character set
* @return status of operation
*/
status_t init(const char *charset = NULL);
/**
* Close decoder and free all resources
*/
void close();
/**
* Fill internal buffer with character data
* @param buf source buffer
* @param count buffer size
* @return number of characters processed or negative error code
*/
ssize_t fill(const lsp_wchar_t *buf, size_t count);
/**
* Fill internal buffer with ASCII character data
* @param buf source buffer
* @param count buffer size
* @return number of characters processed or negative error code
*/
ssize_t fill(const char *buf, size_t count);
/**
* Fill internal buffer with character data from sequence
* @param in input sequence to perform character reading
* @param count maximum number of characters to process, 0 means maximum possible value
* @return number of characters processed or negative error code
*/
ssize_t fill(IInSequence *in, size_t count = 0);
/**
* Fill internal buffer with one single character
* @param ch character to add to buffer
* @return positive number on success 0 if no place in buffer or negative status of operation
*/
ssize_t fill(lsp_wchar_t ch);
/**
* Fill internal buffer with character data from string
* @param in input string to perform character reading
* @param first the index of first character to take from string
* @param last the index of first character that won't be taken
* @return number of characters processed or negative error code
*/
ssize_t fill(const LSPString *in, size_t first, size_t last);
inline ssize_t fill(const LSPString *in, size_t first) { return (in == NULL) ? -STATUS_BAD_ARGUMENTS : fill(in, first, in->length()); };
inline ssize_t fill(const LSPString *in) { return (in == NULL) ? -STATUS_BAD_ARGUMENTS : fill(in, 0, in->length()); };
/**
* Fetch output byte data into buffer
* @param buf buffer to perform fetch
* @param count maximum number of bytes to fetch
* @return number of bytes fetched or negative error code
*/
ssize_t fetch(void *buf, size_t count);
/**
* Fetch output byte data into buffer
* @param buf buffer to perform fetch
* @param count maximum number of bytes to fetch, 0 means maximum possible value
* @return number of bytes fetched or negative error code
*/
ssize_t fetch(File *out, size_t count = 0);
/**
* Fetch output byte data into output stream
* @param buf buffer to perform fetch
* @param count maximum number of bytes to fetch, 0 means maximum possible value
* @return number of bytes fetched or negative error code
*/
ssize_t fetch(IOutStream *out, size_t count = 0);
};
} /* namespace io */
} /* namespace lsp */
#endif /* LSP_PLUG_IN_IO_CHARSETENCODER_H_ */
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