зеркало из https://github.com/github/putty.git
90 строки
3.0 KiB
C
90 строки
3.0 KiB
C
/*
|
|
* internal.h - internal header stuff for the charset library.
|
|
*/
|
|
|
|
#ifndef charset_internal_h
|
|
#define charset_internal_h
|
|
|
|
/* This invariably comes in handy */
|
|
#define lenof(x) ( sizeof((x)) / sizeof(*(x)) )
|
|
|
|
/* This is an invalid Unicode value used to indicate an error. */
|
|
#define ERROR 0xFFFFL /* Unicode value representing error */
|
|
|
|
typedef struct charset_spec charset_spec;
|
|
typedef struct sbcs_data sbcs_data;
|
|
|
|
struct charset_spec {
|
|
int charset; /* numeric identifier */
|
|
|
|
/*
|
|
* A function to read the character set and output Unicode
|
|
* characters. The `emit' function expects to get Unicode chars
|
|
* passed to it; it should be sent ERROR for any encoding error
|
|
* on the input.
|
|
*/
|
|
void (*read)(charset_spec const *charset, long int input_chr,
|
|
charset_state *state,
|
|
void (*emit)(void *ctx, long int output), void *emitctx);
|
|
/*
|
|
* A function to read Unicode characters and output in this
|
|
* character set. The `emit' function expects to get byte
|
|
* values passed to it; it should be sent ERROR for any
|
|
* non-representable characters on the input.
|
|
*/
|
|
void (*write)(charset_spec const *charset, long int input_chr,
|
|
charset_state *state,
|
|
void (*emit)(void *ctx, long int output), void *emitctx);
|
|
void const *data;
|
|
};
|
|
|
|
/*
|
|
* This is the format of `data' used by the SBCS read and write
|
|
* functions; so it's the format used in all SBCS definitions.
|
|
*/
|
|
struct sbcs_data {
|
|
/*
|
|
* This is a simple mapping table converting each SBCS position
|
|
* to a Unicode code point. Some positions may contain ERROR,
|
|
* indicating that that byte value is not defined in the SBCS
|
|
* in question and its occurrence in input is an error.
|
|
*/
|
|
unsigned long sbcs2ucs[256];
|
|
|
|
/*
|
|
* This lookup table is used to convert Unicode back to the
|
|
* SBCS. It consists of the valid byte values in the SBCS,
|
|
* sorted in order of their Unicode translation. So given a
|
|
* Unicode value U, you can do a binary search on this table
|
|
* using the above table as a lookup: when testing the Xth
|
|
* position in this table, you branch according to whether
|
|
* sbcs2ucs[ucs2sbcs[X]] is less than, greater than, or equal
|
|
* to U.
|
|
*
|
|
* Note that since there may be fewer than 256 valid byte
|
|
* values in a particular SBCS, we must supply the length of
|
|
* this table as well as the contents.
|
|
*/
|
|
unsigned char ucs2sbcs[256];
|
|
int nvalid;
|
|
};
|
|
|
|
/*
|
|
* Prototypes for internal library functions.
|
|
*/
|
|
charset_spec const *charset_find_spec(int charset);
|
|
void read_sbcs(charset_spec const *charset, long int input_chr,
|
|
charset_state *state,
|
|
void (*emit)(void *ctx, long int output), void *emitctx);
|
|
void write_sbcs(charset_spec const *charset, long int input_chr,
|
|
charset_state *state,
|
|
void (*emit)(void *ctx, long int output), void *emitctx);
|
|
|
|
/*
|
|
* Placate compiler warning about unused parameters, of which we
|
|
* expect to have some in this library.
|
|
*/
|
|
#define UNUSEDARG(x) ( (x) = (x) )
|
|
|
|
#endif /* charset_internal_h */
|