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/**********************************************************************

transcode_data.h -

$Author$
created at: Mon 10 Dec 2007 14:01:47 JST 2007

Copyright (C) 2007 Martin Duerst

**********************************************************************/

#include "ruby/ruby.h"

#ifndef RUBY_TRANSCODE_DATA_H
#define RUBY_TRANSCODE_DATA_H 1

#if defined __GNUC__ && __GNUC__ >= 4
#pragma GCC visibility push(default)
#endif

#define WORDINDEX_SHIFT_BITS 2
#define WORDINDEX2INFO(widx) ((widx) << WORDINDEX_SHIFT_BITS)
#define INFO2WORDINDEX(info) ((info) >> WORDINDEX_SHIFT_BITS)
#define BYTE_LOOKUP_BASE(bl) ((bl)[0])
#define BYTE_LOOKUP_INFO(bl) ((bl)[1])

#define PType (unsigned int)

#define NOMAP (PType 0x01) /* direct map */
#define ONEbt (0x02) /* one byte payload */
#define TWObt (0x03) /* two bytes payload */
#define THREEbt (0x05) /* three bytes payload */
#define FOURbt (0x06) /* four bytes payload, UTF-8 only, macros start at getBT0 */
#define INVALID (PType 0x07) /* invalid byte sequence */
#define UNDEF (PType 0x09) /* legal but undefined */
#define ZERObt (PType 0x0A) /* zero bytes of payload, i.e. remove */
#define FUNii (PType 0x0B) /* function from info to info */
#define FUNsi (PType 0x0D) /* function from start to info */
#define FUNio (PType 0x0E) /* function from info to output */
#define FUNso (PType 0x0F) /* function from start to output */
#define STR1 (PType 0x11) /* string 4 <= len <= 259 bytes: 1byte length + content */
#define GB4bt (PType 0x12) /* GB18030 four bytes payload */
#define FUNsio (PType 0x13) /* function from start and info to output */

#define STR1_LENGTH(byte_addr) (unsigned int)(*(byte_addr) + 4)
#define STR1_BYTEINDEX(w) ((w) >> 6)
#define makeSTR1(bi) (((bi) << 6) | STR1)
#define makeSTR1LEN(len) ((len)-4)

#define o1(b1) (PType((((unsigned char)(b1))<<8)|ONEbt))
#define o2(b1,b2) (PType((((unsigned char)(b1))<<8)|(((unsigned char)(b2))<<16)|TWObt))
#define o3(b1,b2,b3) (PType(((((unsigned char)(b1))<<8)|(((unsigned char)(b2))<<16)|(((unsigned int)(unsigned char)(b3))<<24)|THREEbt)&0xffffffffU))
#define o4(b0,b1,b2,b3) (PType(((((unsigned char)(b1))<<8)|(((unsigned char)(b2))<<16)|(((unsigned char)(b3))<<24)|((((unsigned char)(b0))&0x07)<<5)|FOURbt)&0xffffffffU))
#define g4(b0,b1,b2,b3) (PType(((((unsigned char)(b0))<<8)|(((unsigned char)(b2))<<16)|((((unsigned char)(b1))&0x0f)<<24)|((((unsigned int)(unsigned char)(b3))&0x0f)<<28)|GB4bt)&0xffffffffU))
#define funsio(diff) (PType((((unsigned int)(diff))<<8)|FUNsio))

#define getBT1(a) ((unsigned char)((a)>> 8))
#define getBT2(a) ((unsigned char)((a)>>16))
#define getBT3(a) ((unsigned char)((a)>>24))
#define getBT0(a) (((unsigned char)((a)>> 5)&0x07)|0xF0) /* for UTF-8 only!!! */

#define getGB4bt0(a) ((unsigned char)((a)>> 8))
#define getGB4bt1(a) (((unsigned char)((a)>>24)&0x0F)|0x30)
#define getGB4bt2(a) ((unsigned char)((a)>>16))
#define getGB4bt3(a) (((unsigned char)((a)>>28)&0x0F)|0x30)

#define o2FUNii(b1,b2) (PType((((unsigned char)(b1))<<8)|(((unsigned char)(b2))<<16)|FUNii))

/* do we need these??? maybe not, can be done with simple tables */
#define ONETRAIL /* legal but undefined if one more trailing UTF-8 */
#define TWOTRAIL /* legal but undefined if two more trailing UTF-8 */
#define THREETRAIL /* legal but undefined if three more trailing UTF-8 */

typedef enum {
  asciicompat_converter, /* ASCII-compatible -> ASCII-compatible */
  asciicompat_decoder, /* ASCII-incompatible -> ASCII-compatible */
  asciicompat_encoder /* ASCII-compatible -> ASCII-incompatible */
  /* ASCII-incompatible -> ASCII-incompatible is intentionally omitted. */
} rb_transcoder_asciicompat_type_t;

typedef struct rb_transcoder rb_transcoder;

/* static structure, one per supported encoding pair */
struct rb_transcoder {
    const char *src_encoding;
    const char *dst_encoding;
    unsigned int conv_tree_start;
    const unsigned char *byte_array;
    unsigned int byte_array_length;
    const unsigned int *word_array;
    unsigned int word_array_length;
    int word_size;
    int input_unit_length;
    int max_input;
    int max_output;
    rb_transcoder_asciicompat_type_t asciicompat_type;
    size_t state_size;
    int (*state_init_func)(void*); /* ret==0:success ret!=0:failure(errno) */
    int (*state_fini_func)(void*); /* ret==0:success ret!=0:failure(errno) */
    VALUE (*func_ii)(void*, VALUE); /* info -> info */
    VALUE (*func_si)(void*, const unsigned char*, size_t); /* start -> info */
    ssize_t (*func_io)(void*, VALUE, const unsigned char*, size_t); /* info -> output */
    ssize_t (*func_so)(void*, const unsigned char*, size_t, unsigned char*, size_t); /* start -> output */
    ssize_t (*finish_func)(void*, unsigned char*, size_t); /* -> output */
    ssize_t (*resetsize_func)(void*); /* -> len */
    ssize_t (*resetstate_func)(void*, unsigned char*, size_t); /* -> output */
    ssize_t (*func_sio)(void*, const unsigned char*, size_t, VALUE, unsigned char*, size_t); /* start -> output */
};

void rb_declare_transcoder(const char *enc1, const char *enc2, const char *lib);
void rb_register_transcoder(const rb_transcoder *);

/*
* To get rid of collision of initializer symbols in statically-linked encodings
* and transcoders
*/
#if defined(EXTSTATIC) && EXTSTATIC
# define TRANS_INIT(name) void Init_trans_ ## name(void)
#else
# define TRANS_INIT(name) void Init_ ## name(void)
#endif

#if defined __GNUC__ && __GNUC__ >= 4
#pragma GCC visibility pop
#endif

#endif /* RUBY_TRANSCODE_DATA_H */
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