/* ******************************************************************************* * * 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__ */