/src/icu/icu4c/source/common/udataswp.cpp

Source (jump to first uncovered line)
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*
*   Copyright (C) 2003-2014, International Business Machines
*   Corporation and others.  All Rights Reserved.
*
*******************************************************************************
*   file name:  udataswp.c
*   encoding:   UTF-8
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 2003jun05
*   created by: Markus W. Scherer
*
*   Definitions for ICU data transformations for different platforms,
*   changing between big- and little-endian data and/or between
*   charset families (ASCII<->EBCDIC).
*/

#include <stdarg.h>
#include "unicode/utypes.h"
#include "unicode/udata.h" /* UDataInfo */
#include "ucmndata.h" /* DataHeader */
#include "cmemory.h"
#include "udataswp.h"

/* swapping primitives ------------------------------------------------------ */

static int32_t U_CALLCONV
uprv_swapArray16(const UDataSwapper *ds,
                 const void *inData, int32_t length, void *outData,
                 UErrorCode *pErrorCode) {
    const uint16_t *p;
    uint16_t *q;
    int32_t count;
    uint16_t x;

    if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) {
        return 0;
    }
    if(ds==nullptr || inData==nullptr || length<0 || (length&1)!=0 || outData==nullptr) {
        *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
        return 0;
    }

    /* setup and swapping */
    p = static_cast<const uint16_t*>(inData);
    q = static_cast<uint16_t*>(outData);
    count=length/2;
    while(count>0) {
        x=*p++;
        *q++ = static_cast<uint16_t>((x << 8) | (x >> 8));
        --count;
    }

    return length;
}

static int32_t U_CALLCONV
uprv_copyArray16(const UDataSwapper *ds,
                 const void *inData, int32_t length, void *outData,
                 UErrorCode *pErrorCode) {
    if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) {
        return 0;
    }
    if(ds==nullptr || inData==nullptr || length<0 || (length&1)!=0 || outData==nullptr) {
        *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
        return 0;
    }

    if(length>0 && inData!=outData) {
        uprv_memcpy(outData, inData, length);
    }
    return length;
}

static int32_t U_CALLCONV
uprv_swapArray32(const UDataSwapper *ds,
                 const void *inData, int32_t length, void *outData,
                 UErrorCode *pErrorCode) {
    const uint32_t *p;
    uint32_t *q;
    int32_t count;
    uint32_t x;

    if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) {
        return 0;
    }
    if(ds==nullptr || inData==nullptr || length<0 || (length&3)!=0 || outData==nullptr) {
        *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
        return 0;
    }

    /* setup and swapping */
    p = static_cast<const uint32_t*>(inData);
    q = static_cast<uint32_t*>(outData);
    count=length/4;
    while(count>0) {
        x=*p++;
        *q++ = (x << 24) | ((x << 8) & 0xff0000) | ((x >> 8) & 0xff00) | (x >> 24);
        --count;
    }

    return length;
}

static int32_t U_CALLCONV
uprv_copyArray32(const UDataSwapper *ds,
                 const void *inData, int32_t length, void *outData,
                 UErrorCode *pErrorCode) {
    if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) {
        return 0;
    }
    if(ds==nullptr || inData==nullptr || length<0 || (length&3)!=0 || outData==nullptr) {
        *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
        return 0;
    }

    if(length>0 && inData!=outData) {
        uprv_memcpy(outData, inData, length);
    }
    return length;
}

static int32_t U_CALLCONV
uprv_swapArray64(const UDataSwapper *ds,
                 const void *inData, int32_t length, void *outData,
                 UErrorCode *pErrorCode) {
    const uint64_t *p;
    uint64_t *q;
    int32_t count;

    if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) {
        return 0;
    }
    if(ds==nullptr || inData==nullptr || length<0 || (length&7)!=0 || outData==nullptr) {
        *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
        return 0;
    }

    /* setup and swapping */
    p = static_cast<const uint64_t*>(inData);
    q = static_cast<uint64_t*>(outData);
    count=length/8;
    while(count>0) {
        uint64_t x=*p++;
        x=(x<<56)|((x&0xff00)<<40)|((x&0xff0000)<<24)|((x&0xff000000)<<8)|
            ((x>>8)&0xff000000)|((x>>24)&0xff0000)|((x>>40)&0xff00)|(x>>56);
        *q++=x;
        --count;
    }

    return length;
}

static int32_t U_CALLCONV
uprv_copyArray64(const UDataSwapper *ds,
                 const void *inData, int32_t length, void *outData,
                 UErrorCode *pErrorCode) {
    if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) {
        return 0;
    }
    if(ds==nullptr || inData==nullptr || length<0 || (length&7)!=0 || outData==nullptr) {
        *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
        return 0;
    }

    if(length>0 && inData!=outData) {
        uprv_memcpy(outData, inData, length);
    }
    return length;
}

static uint16_t U_CALLCONV
uprv_readSwapUInt16(uint16_t x) {
    return static_cast<uint16_t>((x << 8) | (x >> 8));
}

static uint16_t U_CALLCONV
uprv_readDirectUInt16(uint16_t x) {
    return x;
}

static uint32_t U_CALLCONV
uprv_readSwapUInt32(uint32_t x) {
    return (x << 24) | ((x << 8) & 0xff0000) | ((x >> 8) & 0xff00) | (x >> 24);
}

static uint32_t U_CALLCONV
uprv_readDirectUInt32(uint32_t x) {
    return x;
}

static void U_CALLCONV
uprv_writeSwapUInt16(uint16_t *p, uint16_t x) {
    *p = static_cast<uint16_t>((x << 8) | (x >> 8));
}

static void U_CALLCONV
uprv_writeDirectUInt16(uint16_t *p, uint16_t x) {
    *p=x;
}

static void U_CALLCONV
uprv_writeSwapUInt32(uint32_t *p, uint32_t x) {
    *p = (x << 24) | ((x << 8) & 0xff0000) | ((x >> 8) & 0xff00) | (x >> 24);
}

static void U_CALLCONV
uprv_writeDirectUInt32(uint32_t *p, uint32_t x) {
    *p=x;
}

U_CAPI int16_t U_EXPORT2
udata_readInt16(const UDataSwapper *ds, int16_t x) {
    return (int16_t)ds->readUInt16((uint16_t)x);
}

U_CAPI int32_t U_EXPORT2
udata_readInt32(const UDataSwapper *ds, int32_t x) {
    return (int32_t)ds->readUInt32((uint32_t)x);
}

/**
 * Swap a block of invariant, NUL-terminated strings, but not padding
 * bytes after the last string.
 * @internal
 */
U_CAPI int32_t U_EXPORT2
udata_swapInvStringBlock(const UDataSwapper *ds,
                         const void *inData, int32_t length, void *outData,
                         UErrorCode *pErrorCode) {
    const char *inChars;
    int32_t stringsLength;

    if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) {
        return 0;
    }
    if(ds==nullptr || inData==nullptr || length<0 || (length>0 && outData==nullptr)) {
        *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
        return 0;
    }

    /* reduce the strings length to not include bytes after the last NUL */
    inChars=(const char *)inData;
    stringsLength=length;
    while(stringsLength>0 && inChars[stringsLength-1]!=0) {
        --stringsLength;
    }

    /* swap up to the last NUL */
    ds->swapInvChars(ds, inData, stringsLength, outData, pErrorCode);

    /* copy the bytes after the last NUL */
    if(inData!=outData && length>stringsLength) {
        uprv_memcpy((char *)outData+stringsLength, inChars+stringsLength, length-stringsLength);
    }

    /* return the length including padding bytes */
    if(U_SUCCESS(*pErrorCode)) {
        return length;
    } else {
        return 0;
    }
}

U_CAPI void U_EXPORT2
udata_printError(const UDataSwapper *ds,
                 const char *fmt,
                 ...) {
    va_list args;

    if(ds->printError!=nullptr) {
        va_start(args, fmt);
        ds->printError(ds->printErrorContext, fmt, args);
        va_end(args);
    }
}

/* swap a data header ------------------------------------------------------- */

U_CAPI int32_t U_EXPORT2
udata_swapDataHeader(const UDataSwapper *ds,
                     const void *inData, int32_t length, void *outData,
                     UErrorCode *pErrorCode) {
    const DataHeader *pHeader;
    uint16_t headerSize, infoSize;

    /* argument checking */
    if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) {
        return 0;
    }
    if(ds==nullptr || inData==nullptr || length<-1 || (length>0 && outData==nullptr)) {
        *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
        return 0;
    }

    /* check minimum length and magic bytes */
    pHeader=(const DataHeader *)inData;
    if( (length>=0 && length<(int32_t)sizeof(DataHeader)) ||
        pHeader->dataHeader.magic1!=0xda ||
        pHeader->dataHeader.magic2!=0x27 ||
        pHeader->info.sizeofUChar!=2
    ) {
        udata_printError(ds, "udata_swapDataHeader(): initial bytes do not look like ICU data\n");
        *pErrorCode=U_UNSUPPORTED_ERROR;
        return 0;
    }

    headerSize=ds->readUInt16(pHeader->dataHeader.headerSize);
    infoSize=ds->readUInt16(pHeader->info.size);

    if( headerSize<sizeof(DataHeader) ||
        infoSize<sizeof(UDataInfo) ||
        headerSize<(sizeof(pHeader->dataHeader)+infoSize) ||
        (length>=0 && length<headerSize)
    ) {
        udata_printError(ds, "udata_swapDataHeader(): header size mismatch - headerSize %d infoSize %d length %d\n",
                         headerSize, infoSize, length);
        *pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
        return 0;
    }

    if(length>0) {
        DataHeader *outHeader;
        const char *s;
        int32_t maxLength;

        /* Most of the fields are just bytes and need no swapping. */
        if(inData!=outData) {
            uprv_memcpy(outData, inData, headerSize);
        }
        outHeader=(DataHeader *)outData;

        outHeader->info.isBigEndian = ds->outIsBigEndian;
        outHeader->info.charsetFamily = ds->outCharset;

        /* swap headerSize */
        ds->swapArray16(ds, &pHeader->dataHeader.headerSize, 2, &outHeader->dataHeader.headerSize, pErrorCode);

        /* swap UDataInfo size and reservedWord */
        ds->swapArray16(ds, &pHeader->info.size, 4, &outHeader->info.size, pErrorCode);

        /* swap copyright statement after the UDataInfo */
        infoSize+=sizeof(pHeader->dataHeader);
        s=(const char *)inData+infoSize;
        maxLength=headerSize-infoSize;
        /* get the length of the string */
        for(length=0; length<maxLength && s[length]!=0; ++length) {}
        /* swap the string contents */
        ds->swapInvChars(ds, s, length, (char *)outData+infoSize, pErrorCode);
    }

    return headerSize;
}

/* API functions ------------------------------------------------------------ */

U_CAPI UDataSwapper * U_EXPORT2
udata_openSwapper(UBool inIsBigEndian, uint8_t inCharset,
                  UBool outIsBigEndian, uint8_t outCharset,
                  UErrorCode *pErrorCode) {
    UDataSwapper *swapper;

    if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) {
        return nullptr;
    }
    if(inCharset>U_EBCDIC_FAMILY || outCharset>U_EBCDIC_FAMILY) {
        *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
        return nullptr;
    }

    /* allocate the swapper */
    swapper=(UDataSwapper *)uprv_malloc(sizeof(UDataSwapper));
    if(swapper==nullptr) {
        *pErrorCode=U_MEMORY_ALLOCATION_ERROR;
        return nullptr;
    }
    uprv_memset(swapper, 0, sizeof(UDataSwapper));

    /* set values and functions pointers according to in/out parameters */
    swapper->inIsBigEndian=inIsBigEndian;
    swapper->inCharset=inCharset;
    swapper->outIsBigEndian=outIsBigEndian;
    swapper->outCharset=outCharset;

    swapper->readUInt16= inIsBigEndian==U_IS_BIG_ENDIAN ? uprv_readDirectUInt16 : uprv_readSwapUInt16;
    swapper->readUInt32= inIsBigEndian==U_IS_BIG_ENDIAN ? uprv_readDirectUInt32 : uprv_readSwapUInt32;

    swapper->writeUInt16= outIsBigEndian==U_IS_BIG_ENDIAN ? uprv_writeDirectUInt16 : uprv_writeSwapUInt16;
    swapper->writeUInt32= outIsBigEndian==U_IS_BIG_ENDIAN ? uprv_writeDirectUInt32 : uprv_writeSwapUInt32;

    swapper->compareInvChars= outCharset==U_ASCII_FAMILY ? uprv_compareInvAscii : uprv_compareInvEbcdic;

    if(inIsBigEndian==outIsBigEndian) {
        swapper->swapArray16=uprv_copyArray16;
        swapper->swapArray32=uprv_copyArray32;
        swapper->swapArray64=uprv_copyArray64;
    } else {
        swapper->swapArray16=uprv_swapArray16;
        swapper->swapArray32=uprv_swapArray32;
        swapper->swapArray64=uprv_swapArray64;
    }

    if(inCharset==U_ASCII_FAMILY) {
        swapper->swapInvChars= outCharset==U_ASCII_FAMILY ? uprv_copyAscii : uprv_ebcdicFromAscii;
    } else /* U_EBCDIC_FAMILY */ {
        swapper->swapInvChars= outCharset==U_EBCDIC_FAMILY ? uprv_copyEbcdic : uprv_asciiFromEbcdic;
    }

    return swapper;
}

U_CAPI UDataSwapper * U_EXPORT2
udata_openSwapperForInputData(const void *data, int32_t length,
                              UBool outIsBigEndian, uint8_t outCharset,
                              UErrorCode *pErrorCode) {
    const DataHeader *pHeader;
    uint16_t headerSize, infoSize;
    UBool inIsBigEndian;
    int8_t inCharset;

    if(pErrorCode==nullptr || U_FAILURE(*pErrorCode)) {
        return nullptr;
    }
    if( data==nullptr ||
        (length>=0 && length<(int32_t)sizeof(DataHeader)) ||
        outCharset>U_EBCDIC_FAMILY
    ) {
        *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
        return nullptr;
    }

    pHeader=(const DataHeader *)data;
    if( (length>=0 && length<(int32_t)sizeof(DataHeader)) ||
        pHeader->dataHeader.magic1!=0xda ||
        pHeader->dataHeader.magic2!=0x27 ||
        pHeader->info.sizeofUChar!=2
    ) {
        *pErrorCode=U_UNSUPPORTED_ERROR;
        return nullptr;
    }

    inIsBigEndian=(UBool)pHeader->info.isBigEndian;
    inCharset=pHeader->info.charsetFamily;

    if(inIsBigEndian==U_IS_BIG_ENDIAN) {
        headerSize=pHeader->dataHeader.headerSize;
        infoSize=pHeader->info.size;
    } else {
        headerSize=uprv_readSwapUInt16(pHeader->dataHeader.headerSize);
        infoSize=uprv_readSwapUInt16(pHeader->info.size);
    }

    if( headerSize<sizeof(DataHeader) ||
        infoSize<sizeof(UDataInfo) ||
        headerSize<(sizeof(pHeader->dataHeader)+infoSize) ||
        (length>=0 && length<headerSize)
    ) {
        *pErrorCode=U_UNSUPPORTED_ERROR;
        return nullptr;
    }

    return udata_openSwapper(inIsBigEndian, inCharset, outIsBigEndian, outCharset, pErrorCode);
}

U_CAPI void U_EXPORT2
udata_closeSwapper(UDataSwapper *ds) {
    uprv_free(ds);
}

Coverage Report

Created: 2025-06-24 06:54

Line	Count	Source (jump to first uncovered line)
1		// © 2016 and later: Unicode, Inc. and others.
2		// License & terms of use: http://www.unicode.org/copyright.html
3		/*
4		*******************************************************************************
5		*
6		* Copyright (C) 2003-2014, International Business Machines
7		* Corporation and others. All Rights Reserved.
8		*
9		*******************************************************************************
10		* file name: udataswp.c
11		* encoding: UTF-8
12		* tab size: 8 (not used)
13		* indentation:4
14		*
15		* created on: 2003jun05
16		* created by: Markus W. Scherer
17		*
18		* Definitions for ICU data transformations for different platforms,
19		* changing between big- and little-endian data and/or between
20		* charset families (ASCII<->EBCDIC).
21		*/
22
23		#include <stdarg.h>
24		#include "unicode/utypes.h"
25		#include "unicode/udata.h" /* UDataInfo */
26		#include "ucmndata.h" /* DataHeader */
27		#include "cmemory.h"
28		#include "udataswp.h"
29
30		/* swapping primitives ------------------------------------------------------ */
31
32		static int32_t U_CALLCONV
33		uprv_swapArray16(const UDataSwapper *ds,
34		const void inData, int32_t length, void outData,
35	0	UErrorCode *pErrorCode) {
36	0	const uint16_t *p;
37	0	uint16_t *q;
38	0	int32_t count;
39	0	uint16_t x;
40
41	0	if(pErrorCode==nullptr \|\| U_FAILURE(*pErrorCode)) {
42	0	return 0;
43	0	}
44	0	if(ds==nullptr \|\| inData==nullptr \|\| length<0 \|\| (length&1)!=0 \|\| outData==nullptr) {
45	0	*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
46	0	return 0;
47	0	}
48
49		/* setup and swapping */
50	0	p = static_cast<const uint16_t*>(inData);
51	0	q = static_cast<uint16_t*>(outData);
52	0	count=length/2;
53	0	while(count>0) {
54	0	x=*p++;
55	0	*q++ = static_cast<uint16_t>((x << 8) \| (x >> 8));
56	0	--count;
57	0	}
58
59	0	return length;
60	0	}
61
62		static int32_t U_CALLCONV
63		uprv_copyArray16(const UDataSwapper *ds,
64		const void inData, int32_t length, void outData,
65	0	UErrorCode *pErrorCode) {
66	0	if(pErrorCode==nullptr \|\| U_FAILURE(*pErrorCode)) {
67	0	return 0;
68	0	}
69	0	if(ds==nullptr \|\| inData==nullptr \|\| length<0 \|\| (length&1)!=0 \|\| outData==nullptr) {
70	0	*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
71	0	return 0;
72	0	}
73
74	0	if(length>0 && inData!=outData) {
75	0	uprv_memcpy(outData, inData, length);
76	0	}
77	0	return length;
78	0	}
79
80		static int32_t U_CALLCONV
81		uprv_swapArray32(const UDataSwapper *ds,
82		const void inData, int32_t length, void outData,
83	0	UErrorCode *pErrorCode) {
84	0	const uint32_t *p;
85	0	uint32_t *q;
86	0	int32_t count;
87	0	uint32_t x;
88
89	0	if(pErrorCode==nullptr \|\| U_FAILURE(*pErrorCode)) {
90	0	return 0;
91	0	}
92	0	if(ds==nullptr \|\| inData==nullptr \|\| length<0 \|\| (length&3)!=0 \|\| outData==nullptr) {
93	0	*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
94	0	return 0;
95	0	}
96
97		/* setup and swapping */
98	0	p = static_cast<const uint32_t*>(inData);
99	0	q = static_cast<uint32_t*>(outData);
100	0	count=length/4;
101	0	while(count>0) {
102	0	x=*p++;
103	0	*q++ = (x << 24) \| ((x << 8) & 0xff0000) \| ((x >> 8) & 0xff00) \| (x >> 24);
104	0	--count;
105	0	}
106
107	0	return length;
108	0	}
109
110		static int32_t U_CALLCONV
111		uprv_copyArray32(const UDataSwapper *ds,
112		const void inData, int32_t length, void outData,
113	0	UErrorCode *pErrorCode) {
114	0	if(pErrorCode==nullptr \|\| U_FAILURE(*pErrorCode)) {
115	0	return 0;
116	0	}
117	0	if(ds==nullptr \|\| inData==nullptr \|\| length<0 \|\| (length&3)!=0 \|\| outData==nullptr) {
118	0	*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
119	0	return 0;
120	0	}
121
122	0	if(length>0 && inData!=outData) {
123	0	uprv_memcpy(outData, inData, length);
124	0	}
125	0	return length;
126	0	}
127
128		static int32_t U_CALLCONV
129		uprv_swapArray64(const UDataSwapper *ds,
130		const void inData, int32_t length, void outData,
131	0	UErrorCode *pErrorCode) {
132	0	const uint64_t *p;
133	0	uint64_t *q;
134	0	int32_t count;
135
136	0	if(pErrorCode==nullptr \|\| U_FAILURE(*pErrorCode)) {
137	0	return 0;
138	0	}
139	0	if(ds==nullptr \|\| inData==nullptr \|\| length<0 \|\| (length&7)!=0 \|\| outData==nullptr) {
140	0	*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
141	0	return 0;
142	0	}
143
144		/* setup and swapping */
145	0	p = static_cast<const uint64_t*>(inData);
146	0	q = static_cast<uint64_t*>(outData);
147	0	count=length/8;
148	0	while(count>0) {
149	0	uint64_t x=*p++;
150	0	x=(x<<56)\|((x&0xff00)<<40)\|((x&0xff0000)<<24)\|((x&0xff000000)<<8)\|
151	0	((x>>8)&0xff000000)\|((x>>24)&0xff0000)\|((x>>40)&0xff00)\|(x>>56);
152	0	*q++=x;
153	0	--count;
154	0	}
155
156	0	return length;
157	0	}
158
159		static int32_t U_CALLCONV
160		uprv_copyArray64(const UDataSwapper *ds,
161		const void inData, int32_t length, void outData,
162	0	UErrorCode *pErrorCode) {
163	0	if(pErrorCode==nullptr \|\| U_FAILURE(*pErrorCode)) {
164	0	return 0;
165	0	}
166	0	if(ds==nullptr \|\| inData==nullptr \|\| length<0 \|\| (length&7)!=0 \|\| outData==nullptr) {
167	0	*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
168	0	return 0;
169	0	}
170
171	0	if(length>0 && inData!=outData) {
172	0	uprv_memcpy(outData, inData, length);
173	0	}
174	0	return length;
175	0	}
176
177		static uint16_t U_CALLCONV
178	0	uprv_readSwapUInt16(uint16_t x) {
179	0	return static_cast<uint16_t>((x << 8) \| (x >> 8));
180	0	}
181
182		static uint16_t U_CALLCONV
183	0	uprv_readDirectUInt16(uint16_t x) {
184	0	return x;
185	0	}
186
187		static uint32_t U_CALLCONV
188	0	uprv_readSwapUInt32(uint32_t x) {
189	0	return (x << 24) \| ((x << 8) & 0xff0000) \| ((x >> 8) & 0xff00) \| (x >> 24);
190	0	}
191
192		static uint32_t U_CALLCONV
193	0	uprv_readDirectUInt32(uint32_t x) {
194	0	return x;
195	0	}
196
197		static void U_CALLCONV
198	0	uprv_writeSwapUInt16(uint16_t *p, uint16_t x) {
199	0	*p = static_cast<uint16_t>((x << 8) \| (x >> 8));
200	0	}
201
202		static void U_CALLCONV
203	0	uprv_writeDirectUInt16(uint16_t *p, uint16_t x) {
204	0	*p=x;
205	0	}
206
207		static void U_CALLCONV
208	0	uprv_writeSwapUInt32(uint32_t *p, uint32_t x) {
209	0	*p = (x << 24) \| ((x << 8) & 0xff0000) \| ((x >> 8) & 0xff00) \| (x >> 24);
210	0	}
211
212		static void U_CALLCONV
213	0	uprv_writeDirectUInt32(uint32_t *p, uint32_t x) {
214	0	*p=x;
215	0	}
216
217		U_CAPI int16_t U_EXPORT2
218	0	udata_readInt16(const UDataSwapper *ds, int16_t x) {
219	0	return (int16_t)ds->readUInt16((uint16_t)x);
220	0	}
221
222		U_CAPI int32_t U_EXPORT2
223	0	udata_readInt32(const UDataSwapper *ds, int32_t x) {
224	0	return (int32_t)ds->readUInt32((uint32_t)x);
225	0	}
226
227		/**
228		* Swap a block of invariant, NUL-terminated strings, but not padding
229		* bytes after the last string.
230		* @internal
231		*/
232		U_CAPI int32_t U_EXPORT2
233		udata_swapInvStringBlock(const UDataSwapper *ds,
234		const void inData, int32_t length, void outData,
235	0	UErrorCode *pErrorCode) {
236	0	const char *inChars;
237	0	int32_t stringsLength;
238
239	0	if(pErrorCode==nullptr \|\| U_FAILURE(*pErrorCode)) {
240	0	return 0;
241	0	}
242	0	if(ds==nullptr \|\| inData==nullptr \|\| length<0 \|\| (length>0 && outData==nullptr)) {
243	0	*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
244	0	return 0;
245	0	}
246
247		/* reduce the strings length to not include bytes after the last NUL */
248	0	inChars=(const char *)inData;
249	0	stringsLength=length;
250	0	while(stringsLength>0 && inChars[stringsLength-1]!=0) {
251	0	--stringsLength;
252	0	}
253
254		/* swap up to the last NUL */
255	0	ds->swapInvChars(ds, inData, stringsLength, outData, pErrorCode);
256
257		/* copy the bytes after the last NUL */
258	0	if(inData!=outData && length>stringsLength) {
259	0	uprv_memcpy((char *)outData+stringsLength, inChars+stringsLength, length-stringsLength);
260	0	}
261
262		/* return the length including padding bytes */
263	0	if(U_SUCCESS(*pErrorCode)) {
264	0	return length;
265	0	} else {
266	0	return 0;
267	0	}
268	0	}
269
270		U_CAPI void U_EXPORT2
271		udata_printError(const UDataSwapper *ds,
272		const char *fmt,
273	0	...) {
274	0	va_list args;
275
276	0	if(ds->printError!=nullptr) {
277	0	va_start(args, fmt);
278	0	ds->printError(ds->printErrorContext, fmt, args);
279	0	va_end(args);
280	0	}
281	0	}
282
283		/* swap a data header ------------------------------------------------------- */
284
285		U_CAPI int32_t U_EXPORT2
286		udata_swapDataHeader(const UDataSwapper *ds,
287		const void inData, int32_t length, void outData,
288	0	UErrorCode *pErrorCode) {
289	0	const DataHeader *pHeader;
290	0	uint16_t headerSize, infoSize;
291
292		/* argument checking */
293	0	if(pErrorCode==nullptr \|\| U_FAILURE(*pErrorCode)) {
294	0	return 0;
295	0	}
296	0	if(ds==nullptr \|\| inData==nullptr \|\| length<-1 \|\| (length>0 && outData==nullptr)) {
297	0	*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
298	0	return 0;
299	0	}
300
301		/* check minimum length and magic bytes */
302	0	pHeader=(const DataHeader *)inData;
303	0	if( (length>=0 && length<(int32_t)sizeof(DataHeader)) \|\|
304	0	pHeader->dataHeader.magic1!=0xda \|\|
305	0	pHeader->dataHeader.magic2!=0x27 \|\|
306	0	pHeader->info.sizeofUChar!=2
307	0	) {
308	0	udata_printError(ds, "udata_swapDataHeader(): initial bytes do not look like ICU data\n");
309	0	*pErrorCode=U_UNSUPPORTED_ERROR;
310	0	return 0;
311	0	}
312
313	0	headerSize=ds->readUInt16(pHeader->dataHeader.headerSize);
314	0	infoSize=ds->readUInt16(pHeader->info.size);
315
316	0	if( headerSize<sizeof(DataHeader) \|\|
317	0	infoSize<sizeof(UDataInfo) \|\|
318	0	headerSize<(sizeof(pHeader->dataHeader)+infoSize) \|\|
319	0	(length>=0 && length<headerSize)
320	0	) {
321	0	udata_printError(ds, "udata_swapDataHeader(): header size mismatch - headerSize %d infoSize %d length %d\n",
322	0	headerSize, infoSize, length);
323	0	*pErrorCode=U_INDEX_OUTOFBOUNDS_ERROR;
324	0	return 0;
325	0	}
326
327	0	if(length>0) {
328	0	DataHeader *outHeader;
329	0	const char *s;
330	0	int32_t maxLength;
331
332		/* Most of the fields are just bytes and need no swapping. */
333	0	if(inData!=outData) {
334	0	uprv_memcpy(outData, inData, headerSize);
335	0	}
336	0	outHeader=(DataHeader *)outData;
337
338	0	outHeader->info.isBigEndian = ds->outIsBigEndian;
339	0	outHeader->info.charsetFamily = ds->outCharset;
340
341		/* swap headerSize */
342	0	ds->swapArray16(ds, &pHeader->dataHeader.headerSize, 2, &outHeader->dataHeader.headerSize, pErrorCode);
343
344		/* swap UDataInfo size and reservedWord */
345	0	ds->swapArray16(ds, &pHeader->info.size, 4, &outHeader->info.size, pErrorCode);
346
347		/* swap copyright statement after the UDataInfo */
348	0	infoSize+=sizeof(pHeader->dataHeader);
349	0	s=(const char *)inData+infoSize;
350	0	maxLength=headerSize-infoSize;
351		/* get the length of the string */
352	0	for(length=0; length<maxLength && s[length]!=0; ++length) {}
353		/* swap the string contents */
354	0	ds->swapInvChars(ds, s, length, (char *)outData+infoSize, pErrorCode);
355	0	}
356
357	0	return headerSize;
358	0	}
359
360		/* API functions ------------------------------------------------------------ */
361
362		U_CAPI UDataSwapper * U_EXPORT2
363		udata_openSwapper(UBool inIsBigEndian, uint8_t inCharset,
364		UBool outIsBigEndian, uint8_t outCharset,
365	0	UErrorCode *pErrorCode) {
366	0	UDataSwapper *swapper;
367
368	0	if(pErrorCode==nullptr \|\| U_FAILURE(*pErrorCode)) {
369	0	return nullptr;
370	0	}
371	0	if(inCharset>U_EBCDIC_FAMILY \|\| outCharset>U_EBCDIC_FAMILY) {
372	0	*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
373	0	return nullptr;
374	0	}
375
376		/* allocate the swapper */
377	0	swapper=(UDataSwapper *)uprv_malloc(sizeof(UDataSwapper));
378	0	if(swapper==nullptr) {
379	0	*pErrorCode=U_MEMORY_ALLOCATION_ERROR;
380	0	return nullptr;
381	0	}
382	0	uprv_memset(swapper, 0, sizeof(UDataSwapper));
383
384		/* set values and functions pointers according to in/out parameters */
385	0	swapper->inIsBigEndian=inIsBigEndian;
386	0	swapper->inCharset=inCharset;
387	0	swapper->outIsBigEndian=outIsBigEndian;
388	0	swapper->outCharset=outCharset;
389
390	0	swapper->readUInt16= inIsBigEndian==U_IS_BIG_ENDIAN ? uprv_readDirectUInt16 : uprv_readSwapUInt16;
391	0	swapper->readUInt32= inIsBigEndian==U_IS_BIG_ENDIAN ? uprv_readDirectUInt32 : uprv_readSwapUInt32;
392
393	0	swapper->writeUInt16= outIsBigEndian==U_IS_BIG_ENDIAN ? uprv_writeDirectUInt16 : uprv_writeSwapUInt16;
394	0	swapper->writeUInt32= outIsBigEndian==U_IS_BIG_ENDIAN ? uprv_writeDirectUInt32 : uprv_writeSwapUInt32;
395
396	0	swapper->compareInvChars= outCharset==U_ASCII_FAMILY ? uprv_compareInvAscii : uprv_compareInvEbcdic;
397
398	0	if(inIsBigEndian==outIsBigEndian) {
399	0	swapper->swapArray16=uprv_copyArray16;
400	0	swapper->swapArray32=uprv_copyArray32;
401	0	swapper->swapArray64=uprv_copyArray64;
402	0	} else {
403	0	swapper->swapArray16=uprv_swapArray16;
404	0	swapper->swapArray32=uprv_swapArray32;
405	0	swapper->swapArray64=uprv_swapArray64;
406	0	}
407
408	0	if(inCharset==U_ASCII_FAMILY) {
409	0	swapper->swapInvChars= outCharset==U_ASCII_FAMILY ? uprv_copyAscii : uprv_ebcdicFromAscii;
410	0	} else /* U_EBCDIC_FAMILY */ {
411	0	swapper->swapInvChars= outCharset==U_EBCDIC_FAMILY ? uprv_copyEbcdic : uprv_asciiFromEbcdic;
412	0	}
413
414	0	return swapper;
415	0	}
416
417		U_CAPI UDataSwapper * U_EXPORT2
418		udata_openSwapperForInputData(const void *data, int32_t length,
419		UBool outIsBigEndian, uint8_t outCharset,
420	0	UErrorCode *pErrorCode) {
421	0	const DataHeader *pHeader;
422	0	uint16_t headerSize, infoSize;
423	0	UBool inIsBigEndian;
424	0	int8_t inCharset;
425
426	0	if(pErrorCode==nullptr \|\| U_FAILURE(*pErrorCode)) {
427	0	return nullptr;
428	0	}
429	0	if( data==nullptr \|\|
430	0	(length>=0 && length<(int32_t)sizeof(DataHeader)) \|\|
431	0	outCharset>U_EBCDIC_FAMILY
432	0	) {
433	0	*pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
434	0	return nullptr;
435	0	}
436
437	0	pHeader=(const DataHeader *)data;
438	0	if( (length>=0 && length<(int32_t)sizeof(DataHeader)) \|\|
439	0	pHeader->dataHeader.magic1!=0xda \|\|
440	0	pHeader->dataHeader.magic2!=0x27 \|\|
441	0	pHeader->info.sizeofUChar!=2
442	0	) {
443	0	*pErrorCode=U_UNSUPPORTED_ERROR;
444	0	return nullptr;
445	0	}
446
447	0	inIsBigEndian=(UBool)pHeader->info.isBigEndian;
448	0	inCharset=pHeader->info.charsetFamily;
449
450	0	if(inIsBigEndian==U_IS_BIG_ENDIAN) {
451	0	headerSize=pHeader->dataHeader.headerSize;
452	0	infoSize=pHeader->info.size;
453	0	} else {
454	0	headerSize=uprv_readSwapUInt16(pHeader->dataHeader.headerSize);
455	0	infoSize=uprv_readSwapUInt16(pHeader->info.size);
456	0	}
457
458	0	if( headerSize<sizeof(DataHeader) \|\|
459	0	infoSize<sizeof(UDataInfo) \|\|
460	0	headerSize<(sizeof(pHeader->dataHeader)+infoSize) \|\|
461	0	(length>=0 && length<headerSize)
462	0	) {
463	0	*pErrorCode=U_UNSUPPORTED_ERROR;
464	0	return nullptr;
465	0	}
466
467	0	return udata_openSwapper(inIsBigEndian, inCharset, outIsBigEndian, outCharset, pErrorCode);
468	0	}
469
470		U_CAPI void U_EXPORT2
471	0	udata_closeSwapper(UDataSwapper *ds) {
472	0	uprv_free(ds);
473	0	}