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transcode_data.h

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00001 /**********************************************************************
00002 
00003   transcode_data.h -
00004 
00005   $Author: duerst $
00006   created at: Mon 10 Dec 2007 14:01:47 JST 2007
00007 
00008   Copyright (C) 2007 Martin Duerst
00009 
00010 **********************************************************************/
00011 
00012 #include "ruby/ruby.h"
00013 
00014 #ifndef RUBY_TRANSCODE_DATA_H
00015 #define RUBY_TRANSCODE_DATA_H 1
00016 
00017 #define WORDINDEX_SHIFT_BITS 2
00018 #define WORDINDEX2INFO(widx)      ((widx) << WORDINDEX_SHIFT_BITS)
00019 #define INFO2WORDINDEX(info)      ((info) >> WORDINDEX_SHIFT_BITS)
00020 #define BYTE_LOOKUP_BASE(bl) ((bl)[0])
00021 #define BYTE_LOOKUP_INFO(bl) ((bl)[1])
00022 
00023 #define PType (unsigned int)
00024 
00025 #define NOMAP   (PType 0x01)    /* direct map */
00026 #define ONEbt   (0x02)          /* one byte payload */
00027 #define TWObt   (0x03)          /* two bytes payload */
00028 #define THREEbt (0x05)          /* three bytes payload */
00029 #define FOURbt  (0x06)          /* four bytes payload, UTF-8 only, macros start at getBT0 */
00030 #define INVALID (PType 0x07)    /* invalid byte sequence */
00031 #define UNDEF   (PType 0x09)    /* legal but undefined */
00032 #define ZERObt  (PType 0x0A)    /* zero bytes of payload, i.e. remove */
00033 #define FUNii   (PType 0x0B)    /* function from info to info */
00034 #define FUNsi   (PType 0x0D)    /* function from start to info */
00035 #define FUNio   (PType 0x0E)    /* function from info to output */
00036 #define FUNso   (PType 0x0F)    /* function from start to output */
00037 #define STR1    (PType 0x11)    /* string 4 <= len <= 259 bytes: 1byte length + content */
00038 #define GB4bt   (PType 0x12)    /* GB18030 four bytes payload */
00039 #define FUNsio  (PType 0x13)    /* function from start and info to output */
00040 
00041 #define STR1_LENGTH(byte_addr) (unsigned int)(*(byte_addr) + 4)
00042 #define STR1_BYTEINDEX(w) ((w) >> 6)
00043 #define makeSTR1(bi) (((bi) << 6) | STR1)
00044 #define makeSTR1LEN(len) ((len)-4)
00045 
00046 #define o1(b1)          (PType((((unsigned char)(b1))<<8)|ONEbt))
00047 #define o2(b1,b2)       (PType((((unsigned char)(b1))<<8)|(((unsigned char)(b2))<<16)|TWObt))
00048 #define o3(b1,b2,b3)    (PType(((((unsigned char)(b1))<<8)|(((unsigned char)(b2))<<16)|(((unsigned int)(unsigned char)(b3))<<24)|THREEbt)&0xffffffffU))
00049 #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))
00050 #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))
00051 #define funsio(diff)    (PType((((unsigned int)(diff))<<8)|FUNsio))
00052 
00053 #define getBT1(a)       ((unsigned char)((a)>> 8))
00054 #define getBT2(a)       ((unsigned char)((a)>>16))
00055 #define getBT3(a)       ((unsigned char)((a)>>24))
00056 #define getBT0(a)       (((unsigned char)((a)>> 5)&0x07)|0xF0)   /* for UTF-8 only!!! */
00057 
00058 #define getGB4bt0(a)    ((unsigned char)((a)>> 8))
00059 #define getGB4bt1(a)    ((unsigned char)((a)>>24)&0x0F|0x30)
00060 #define getGB4bt2(a)    ((unsigned char)((a)>>16))
00061 #define getGB4bt3(a)    ((unsigned char)((a)>>28)&0x0F|0x30)
00062 
00063 #define o2FUNii(b1,b2)  (PType((((unsigned char)(b1))<<8)|(((unsigned char)(b2))<<16)|FUNii))
00064 
00065 /* do we need these??? maybe not, can be done with simple tables */
00066 #define ONETRAIL       /* legal but undefined if one more trailing UTF-8 */
00067 #define TWOTRAIL       /* legal but undefined if two more trailing UTF-8 */
00068 #define THREETRAIL     /* legal but undefined if three more trailing UTF-8 */
00069 
00070 typedef enum {
00071   asciicompat_converter,        /* ASCII-compatible -> ASCII-compatible */
00072   asciicompat_decoder,          /* ASCII-incompatible -> ASCII-compatible */
00073   asciicompat_encoder           /* ASCII-compatible -> ASCII-incompatible */
00074   /* ASCII-incompatible -> ASCII-incompatible is intentionally omitted. */
00075 } rb_transcoder_asciicompat_type_t;
00076 
00077 typedef struct rb_transcoder rb_transcoder;
00078 
00079 /* static structure, one per supported encoding pair */
00080 struct rb_transcoder {
00081     const char *src_encoding;
00082     const char *dst_encoding;
00083     unsigned int conv_tree_start;
00084     const unsigned char *byte_array;
00085     unsigned int byte_array_length;
00086     const unsigned int *word_array;
00087     unsigned int word_array_length;
00088     int word_size;
00089     int input_unit_length;
00090     int max_input;
00091     int max_output;
00092     rb_transcoder_asciicompat_type_t asciicompat_type;
00093     size_t state_size;
00094     int (*state_init_func)(void*); /* ret==0:success ret!=0:failure(errno) */
00095     int (*state_fini_func)(void*); /* ret==0:success ret!=0:failure(errno) */
00096     VALUE (*func_ii)(void*, VALUE); /* info  -> info   */
00097     VALUE (*func_si)(void*, const unsigned char*, size_t); /* start -> info   */
00098     ssize_t (*func_io)(void*, VALUE, const unsigned char*, size_t); /* info  -> output */
00099     ssize_t (*func_so)(void*, const unsigned char*, size_t, unsigned char*, size_t); /* start -> output */
00100     ssize_t (*finish_func)(void*, unsigned char*, size_t); /* -> output */
00101     ssize_t (*resetsize_func)(void*); /* -> len */
00102     ssize_t (*resetstate_func)(void*, unsigned char*, size_t); /* -> output */
00103     ssize_t (*func_sio)(void*, const unsigned char*, size_t, VALUE, unsigned char*, size_t); /* start -> output */
00104 };
00105 
00106 void rb_declare_transcoder(const char *enc1, const char *enc2, const char *lib);
00107 void rb_register_transcoder(const rb_transcoder *);
00108 
00109 #endif /* RUBY_TRANSCODE_DATA_H */
00110 

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