michael@0: /*
michael@0: ******************************************************************************
michael@0: *
michael@0: *   Copyright (C) 1999-2004, International Business Machines
michael@0: *   Corporation and others.  All Rights Reserved.
michael@0: *
michael@0: ******************************************************************************
michael@0: *
michael@0: *   uconv_cnv.c:
michael@0: *   Implements all the low level conversion functions
michael@0: *   T_UnicodeConverter_{to,from}Unicode_$ConversionType
michael@0: *
michael@0: *   Change history:
michael@0: *
michael@0: *   06/29/2000  helena      Major rewrite of the callback APIs.
michael@0: */
michael@0: 
michael@0: #include "unicode/utypes.h"
michael@0: 
michael@0: #if !UCONFIG_NO_CONVERSION
michael@0: 
michael@0: #include "unicode/ucnv_err.h"
michael@0: #include "unicode/ucnv.h"
michael@0: #include "unicode/uset.h"
michael@0: #include "ucnv_cnv.h"
michael@0: #include "ucnv_bld.h"
michael@0: #include "cmemory.h"
michael@0: 
michael@0: U_CFUNC void
michael@0: ucnv_getCompleteUnicodeSet(const UConverter *cnv,
michael@0:                    const USetAdder *sa,
michael@0:                    UConverterUnicodeSet which,
michael@0:                    UErrorCode *pErrorCode) {
michael@0:     sa->addRange(sa->set, 0, 0x10ffff);
michael@0: }
michael@0: 
michael@0: U_CFUNC void
michael@0: ucnv_getNonSurrogateUnicodeSet(const UConverter *cnv,
michael@0:                                const USetAdder *sa,
michael@0:                                UConverterUnicodeSet which,
michael@0:                                UErrorCode *pErrorCode) {
michael@0:     sa->addRange(sa->set, 0, 0xd7ff);
michael@0:     sa->addRange(sa->set, 0xe000, 0x10ffff);
michael@0: }
michael@0: 
michael@0: U_CFUNC void
michael@0: ucnv_fromUWriteBytes(UConverter *cnv,
michael@0:                      const char *bytes, int32_t length,
michael@0:                      char **target, const char *targetLimit,
michael@0:                      int32_t **offsets,
michael@0:                      int32_t sourceIndex,
michael@0:                      UErrorCode *pErrorCode) {
michael@0:     char *t=*target;
michael@0:     int32_t *o;
michael@0: 
michael@0:     /* write bytes */
michael@0:     if(offsets==NULL || (o=*offsets)==NULL) {
michael@0:         while(length>0 && t<targetLimit) {
michael@0:             *t++=*bytes++;
michael@0:             --length;
michael@0:         }
michael@0:     } else {
michael@0:         /* output with offsets */
michael@0:         while(length>0 && t<targetLimit) {
michael@0:             *t++=*bytes++;
michael@0:             *o++=sourceIndex;
michael@0:             --length;
michael@0:         }
michael@0:         *offsets=o;
michael@0:     }
michael@0:     *target=t;
michael@0: 
michael@0:     /* write overflow */
michael@0:     if(length>0) {
michael@0:         if(cnv!=NULL) {
michael@0:             t=(char *)cnv->charErrorBuffer;
michael@0:             cnv->charErrorBufferLength=(int8_t)length;
michael@0:             do {
michael@0:                 *t++=(uint8_t)*bytes++;
michael@0:             } while(--length>0);
michael@0:         }
michael@0:         *pErrorCode=U_BUFFER_OVERFLOW_ERROR;
michael@0:     }
michael@0: }
michael@0: 
michael@0: U_CFUNC void
michael@0: ucnv_toUWriteUChars(UConverter *cnv,
michael@0:                     const UChar *uchars, int32_t length,
michael@0:                     UChar **target, const UChar *targetLimit,
michael@0:                     int32_t **offsets,
michael@0:                     int32_t sourceIndex,
michael@0:                     UErrorCode *pErrorCode) {
michael@0:     UChar *t=*target;
michael@0:     int32_t *o;
michael@0: 
michael@0:     /* write UChars */
michael@0:     if(offsets==NULL || (o=*offsets)==NULL) {
michael@0:         while(length>0 && t<targetLimit) {
michael@0:             *t++=*uchars++;
michael@0:             --length;
michael@0:         }
michael@0:     } else {
michael@0:         /* output with offsets */
michael@0:         while(length>0 && t<targetLimit) {
michael@0:             *t++=*uchars++;
michael@0:             *o++=sourceIndex;
michael@0:             --length;
michael@0:         }
michael@0:         *offsets=o;
michael@0:     }
michael@0:     *target=t;
michael@0: 
michael@0:     /* write overflow */
michael@0:     if(length>0) {
michael@0:         if(cnv!=NULL) {
michael@0:             t=cnv->UCharErrorBuffer;
michael@0:             cnv->UCharErrorBufferLength=(int8_t)length;
michael@0:             do {
michael@0:                 *t++=*uchars++;
michael@0:             } while(--length>0);
michael@0:         }
michael@0:         *pErrorCode=U_BUFFER_OVERFLOW_ERROR;
michael@0:     }
michael@0: }
michael@0: 
michael@0: U_CFUNC void
michael@0: ucnv_toUWriteCodePoint(UConverter *cnv,
michael@0:                        UChar32 c,
michael@0:                        UChar **target, const UChar *targetLimit,
michael@0:                        int32_t **offsets,
michael@0:                        int32_t sourceIndex,
michael@0:                        UErrorCode *pErrorCode) {
michael@0:     UChar *t;
michael@0:     int32_t *o;
michael@0: 
michael@0:     t=*target;
michael@0: 
michael@0:     if(t<targetLimit) {
michael@0:         if(c<=0xffff) {
michael@0:             *t++=(UChar)c;
michael@0:             c=U_SENTINEL;
michael@0:         } else /* c is a supplementary code point */ {
michael@0:             *t++=U16_LEAD(c);
michael@0:             c=U16_TRAIL(c);
michael@0:             if(t<targetLimit) {
michael@0:                 *t++=(UChar)c;
michael@0:                 c=U_SENTINEL;
michael@0:             }
michael@0:         }
michael@0: 
michael@0:         /* write offsets */
michael@0:         if(offsets!=NULL && (o=*offsets)!=NULL) {
michael@0:             *o++=sourceIndex;
michael@0:             if((*target+1)<t) {
michael@0:                 *o++=sourceIndex;
michael@0:             }
michael@0:             *offsets=o;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     *target=t;
michael@0: 
michael@0:     /* write overflow from c */
michael@0:     if(c>=0) {
michael@0:         if(cnv!=NULL) {
michael@0:             int8_t i=0;
michael@0:             U16_APPEND_UNSAFE(cnv->UCharErrorBuffer, i, c);
michael@0:             cnv->UCharErrorBufferLength=i;
michael@0:         }
michael@0:         *pErrorCode=U_BUFFER_OVERFLOW_ERROR;
michael@0:     }
michael@0: }
michael@0: 
michael@0: #endif