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+/*
+ * $LynxId: UCDefs.h,v 1.18 2021/06/29 00:21:51 tom Exp $
+ *
+ * Definitions for Unicode character-translations
+ */
+
+#ifndef UCDEFS_H
+#define UCDEFS_H
+
+#ifndef HTUTILS_H
+#include <HTUtils.h>
+#endif
+
+typedef struct _LYUCcharset {
+ int UChndl; /* -1 for "old" charsets, >= 0 for chartrans tables */
+
+ const char *MIMEname;
+ int enc;
+ int codepage; /* if positive, an IBM OS/2 specific number;
+ if negative, flag for no table translation */
+
+ /* parameters below are not used by chartrans mechanism, */
+ /* they describe some relationships against built-in Latin1 charset... */
+ int repertoire; /* unused */
+ int codepoints; /* subset/superset of Latin1 ? */
+ int cpranges; /* unused, obsolete by LYlowest_eightbit;
+ "which ranges have valid displayable chars
+ (including nbsp and shy)" */
+ int like8859; /* currently used for nbsp and shy only
+ (but UCT_R_8859SPECL assumed for any UCT_R_8BIT...);
+ "for which ranges is it like 8859-1" */
+} LYUCcharset;
+
+typedef enum {
+ UCT_ENC_7BIT,
+ UCT_ENC_8BIT,
+ UCT_ENC_8859, /* no displayable chars in 0x80-0x9F */
+ UCT_ENC_8BIT_C0, /* 8-bit + some chars in C0 control area */
+ UCT_ENC_MAYBE2022,
+ UCT_ENC_CJK,
+ UCT_ENC_16BIT,
+ UCT_ENC_UTF8
+} eUCT_ENC;
+
+#define UCT_REP_SUBSETOF_LAT1 0x01
+#define UCT_REP_SUPERSETOF_LAT1 0x02
+#define UCT_REP_IS_LAT1 UCT_REP_SUBSETOF_LAT1 | UCT_REP_SUPERSETOF_LAT1
+/*
+ * Assume everything we deal with is included in the UCS2 repertoire,
+ * so a flag for _REP_SUBSETOF_UCS2 would be redundant.
+ */
+
+/*
+ * More general description how the code points relate to 8859-1 and UCS:
+ */
+#define UCT_CP_SUBSETOF_LAT1 0x01 /* implies UCT_CP_SUBSETOF_UCS2 */
+#define UCT_CP_SUPERSETOF_LAT1 0x02
+#define UCT_CP_SUBSETOF_UCS2 0x04
+
+#define UCT_CP_IS_LAT1 UCT_CP_SUBSETOF_LAT1 | UCT_CP_SUPERSETOF_LAT1
+
+/*
+ * More specific bitflags for practically important code point ranges:
+ */
+#define UCT_R_LOWCTRL 0x08 /* 0x00-0x1F, for completeness */
+#define UCT_R_7BITINV 0x10 /* invariant???, displayable 7bit chars */
+#define UCT_R_7BITNAT 0x20 /* displayable 7bit, national??? */
+#define UCT_R_HIGHCTRL 0x40 /* chars in 0x80-0x9F range */
+#define UCT_R_8859SPECL 0x80 /* special chars in 8859-x sets: nbsp and shy */
+#define UCT_R_HIGH8BIT 0x100 /* rest of 0xA0-0xFF range */
+
+#define UCT_R_ASCII UCT_R_7BITINV | UCT_R_7BITNAT /* displayable US-ASCII */
+#define UCT_R_LAT1 UCT_R_ASCII | UCT_R_8859SPECL | UCT_R_HIGH8BIT
+#define UCT_R_8BIT UCT_R_LAT1 | UCT_R_HIGHCTRL /* full 8bit range */
+
+/*
+ * For the following some comments are in HTAnchor.c.
+ */
+typedef enum {
+ UCT_STAGE_MIME,
+ UCT_STAGE_PARSER, /* What the parser (SGML.c) gets to see */
+ UCT_STAGE_STRUCTURED, /* What the structured stream (HTML) gets fed */
+ UCT_STAGE_HTEXT, /* What gets fed to the HText_* functions */
+ UCT_STAGEMAX
+} eUCT_STAGE;
+
+typedef enum {
+ UCT_SETBY_NONE,
+ UCT_SETBY_DEFAULT,
+ UCT_SETBY_LINK, /* set by A or LINK CHARSET= hint */
+ UCT_SETBY_STRUCTURED, /* structured stream stage (HTML.c) */
+ UCT_SETBY_PARSER, /* set by SGML parser or similar */
+ UCT_SETBY_MIME /* set explicitly by MIME charset parameter */
+} eUCT_SETBY;
+
+typedef struct _UCStageInfo {
+ int lock; /* by what it has been set */
+ int LYhndl;
+ LYUCcharset C;
+} UCStageInfo;
+
+typedef struct _UCAnchorInfo {
+ struct _UCStageInfo s[UCT_STAGEMAX];
+} UCAnchorInfo;
+
+#endif /* UCDEFS_H */