Index: icu46/source/tools/makeconv/genmbcs.h |
=================================================================== |
--- icu46/source/tools/makeconv/genmbcs.h (revision 0) |
+++ icu46/source/tools/makeconv/genmbcs.h (revision 0) |
@@ -0,0 +1,124 @@ |
+/* |
+******************************************************************************* |
+* |
+* Copyright (C) 2000-2008, International Business Machines |
+* Corporation and others. All Rights Reserved. |
+* |
+******************************************************************************* |
+* file name: genmbcs.h |
+* encoding: US-ASCII |
+* tab size: 8 (not used) |
+* indentation:4 |
+* |
+* created on: 2000jul10 |
+* created by: Markus W. Scherer |
+*/ |
+ |
+#ifndef __GENMBCS_H__ |
+#define __GENMBCS_H__ |
+ |
+#include "makeconv.h" |
+ |
+enum { |
+ /* |
+ * TODO: Consider using ucnvmbcs.h constants. |
+ * However, not all values need to be exactly the same, for example |
+ * the xxx_UTF8_MAX values may be different. (Especially SBCS_UTF8_MAX |
+ * may be higher in makeconv than in the runtime code because that |
+ * affects only a small number of .cnv files [if any] but all |
+ * runtime UConverterSharedData objects. |
+ */ |
+ MBCS_STAGE_2_SHIFT=4, |
+ MBCS_STAGE_2_BLOCK_SIZE=0x40, /* =64=1<<6 for 6 bits in stage 2 */ |
+ MBCS_STAGE_2_BLOCK_SIZE_SHIFT=6, /* log2(MBCS_STAGE_2_BLOCK_SIZE) */ |
+ MBCS_STAGE_2_BLOCK_MASK=0x3f, /* for after shifting by MBCS_STAGE_2_SHIFT */ |
+ MBCS_STAGE_1_SHIFT=10, |
+ MBCS_STAGE_1_BMP_SIZE=0x40, /* 0x10000>>MBCS_STAGE_1_SHIFT, or 16 for one entry per 1k code points on the BMP */ |
+ MBCS_STAGE_1_SIZE=0x440, /* 0x110000>>MBCS_STAGE_1_SHIFT, or 17*64 for one entry per 1k code points */ |
+ MBCS_STAGE_2_SIZE=0xfbc0, /* 0x10000-MBCS_STAGE_1_SIZE: stages 1 & 2 share a 16-bit-indexed array */ |
+ MBCS_MAX_STAGE_2_TOP=MBCS_STAGE_2_SIZE, |
+ MBCS_STAGE_2_MAX_BLOCKS=MBCS_STAGE_2_SIZE>>MBCS_STAGE_2_BLOCK_SIZE_SHIFT, |
+ |
+ MBCS_STAGE_2_ALL_UNASSIGNED_INDEX=0, /* stage 1 entry for the all-unassigned stage 2 block */ |
+ MBCS_STAGE_2_FIRST_ASSIGNED=MBCS_STAGE_2_BLOCK_SIZE, /* start of the first stage 2 block after the all-unassigned one */ |
+ |
+ MBCS_STAGE_3_BLOCK_SIZE=16, /* =16=1<<4 for 4 bits in stage 3 */ |
+ MBCS_STAGE_3_BLOCK_MASK=0xf, |
+ MBCS_STAGE_3_FIRST_ASSIGNED=MBCS_STAGE_3_BLOCK_SIZE, /* start of the first stage 3 block after the all-unassigned one */ |
+ |
+ MBCS_STAGE_3_GRANULARITY=16, /* =1<<4: MBCS stage 2 indexes are shifted left 4 */ |
+ MBCS_STAGE_3_SBCS_SIZE=0x10000, /* max 64k mappings for SBCS */ |
+ MBCS_STAGE_3_MBCS_SIZE=0x10000*MBCS_STAGE_3_GRANULARITY, /* max mappings for MBCS */ |
+ |
+ /* |
+ * SBCS_UTF8_MAX: Maximum code point with UTF-8-friendly SBCS data structures. |
+ * Possible values are 0x01ff..0xffff, in steps of 0x100. |
+ * |
+ * Unlike for MBCS, this constant only affects the stage 3 block allocation size; |
+ * there is no additional stage 1/2 table stored in the .cnv file. |
+ * The max value should be at least 0x7ff to cover 2-byte UTF-8. |
+ * 0xfff also covers a number other small scripts which have legacy charsets |
+ * (like Thai). |
+ * Higher values up to 0x1fff are harmless and potentially useful because |
+ * that covers small-script blocks which usually have either dense mappings |
+ * or no mappings at all. |
+ * Starting at U+2000, there are mostly symbols and format characters |
+ * with a low density of SBCS mappings, which would result in more wasted |
+ * stage 3 entries with the larger block size. |
+ */ |
+ SBCS_UTF8_MAX=0x1fff, |
+ |
+ /* |
+ * MBCS_UTF8_MAX: Maximum code point with UTF-8-friendly MBCS data structures. |
+ * Possible values are 0x01ff..0xffff, in steps of 0x100. |
+ * |
+ * Note that with 0xffff, MBCSAddFromUnicode() may overflow the additional UTF-8 stage table |
+ * with extreme input data. The function checks for this overflow. |
+ * |
+ * 0xd7ff is chosen for the majority of common characters including Unihan and Hangul. |
+ * At U+d800 there are mostly surrogates, private use codes, compatibility characters, etc. |
+ * Larger values cause slightly larger MBCS .cnv files. |
+ */ |
+ MBCS_UTF8_MAX=0xd7ff, |
+ MBCS_UTF8_LIMIT=MBCS_UTF8_MAX+1, /* =0xd800 */ |
+ |
+ MBCS_UTF8_STAGE_SHIFT=6, |
+ MBCS_UTF8_STAGE_3_BLOCK_SIZE=0x40, /* =64=1<<6 for 6 bits from last trail byte */ |
+ MBCS_UTF8_STAGE_3_BLOCK_MASK=0x3f, |
+ |
+ /* size of the single-stage table for up to U+d7ff (used instead of stage1/2) */ |
+ MBCS_UTF8_STAGE_SIZE=MBCS_UTF8_LIMIT>>MBCS_UTF8_STAGE_SHIFT, /* =0x360 */ |
+ |
+ MBCS_FROM_U_EXT_FLAG=0x10, /* UCMapping.f bit for base table mappings that fit into the base toU table */ |
+ MBCS_FROM_U_EXT_MASK=0x0f, /* but need to go into the extension fromU table */ |
+ |
+ /* =4 number of regular stage 3 blocks for final UTF-8 trail byte */ |
+ MBCS_UTF8_STAGE_3_BLOCKS=MBCS_UTF8_STAGE_3_BLOCK_SIZE/MBCS_STAGE_3_BLOCK_SIZE, |
+ |
+ MBCS_MAX_FALLBACK_COUNT=8192 |
+}; |
+ |
+U_CFUNC NewConverter * |
+MBCSOpen(UCMFile *ucm); |
+ |
+struct MBCSData; |
+typedef struct MBCSData MBCSData; |
+ |
+/* |
+ * Get a dummy MBCSData for use with MBCSOkForBaseFromUnicode() |
+ * for creating an extension-only file. |
+ * Assume maxCharLength>1. |
+ */ |
+U_CFUNC const MBCSData * |
+MBCSGetDummy(void); |
+ |
+/* Test if a 1:1 mapping fits into the MBCS base table's fromUnicode structure. */ |
+U_CFUNC UBool |
+MBCSOkForBaseFromUnicode(const MBCSData *mbcsData, |
+ const uint8_t *bytes, int32_t length, |
+ UChar32 c, int8_t flag); |
+ |
+U_CFUNC NewConverter * |
+CnvExtOpen(UCMFile *ucm); |
+ |
+#endif /* __GENMBCS_H__ */ |
Property changes on: icu46/source/tools/makeconv/genmbcs.h |
___________________________________________________________________ |
Added: svn:eol-style |
+ LF |