/*
*******************************************************************************
*
* Copyright (C) 2003-2014, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: udataswp.h
* encoding: US-ASCII
* 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).
*/
#ifndef __UDATASWP_H__
#define __UDATASWP_H__
#include <stdarg.h>
#include "unicode/utypes.h"
/* forward declaration */
U_CDECL_BEGIN
struct UDataSwapper;
typedef struct UDataSwapper UDataSwapper;
/**
* Function type for data transformation.
* Transforms data, or just returns the length of the data if
* the input length is -1.
* Swap functions assume that their data pointers are aligned properly.
*
* Quick implementation outline:
* (best to copy and adapt and existing swapper implementation)
* check that the data looks like the expected format
* if(length<0) {
* preflight:
* never dereference outData
* read inData and determine the data size
* assume that inData is long enough for this
* } else {
* outData can be NULL if length==0
* inData==outData (in-place swapping) possible but not required!
* verify that length>=(actual size)
* if there is a chance that not every byte up to size is reached
* due to padding etc.:
* if(inData!=outData) {
* memcpy(outData, inData, actual size);
* }
* swap contents
* }
* return actual size
*
* Further implementation notes:
* - read integers from inData before swapping them
* because in-place swapping can make them unreadable
* - compareInvChars compares a local Unicode string with already-swapped
* output charset strings
*
* @param ds Pointer to UDataSwapper containing global data about the
* transformation and function pointers for handling primitive
* types.
* @param inData Pointer to the input data to be transformed or examined.
* @param length Length of the data, counting bytes. May be -1 for preflighting.
* If length>=0, then transform the data.
* If length==-1, then only determine the length of the data.
* The length cannot be determined from the data itself for all
* types of data (e.g., not for simple arrays of integers).
* @param outData Pointer to the output data buffer.
* If length>=0 (transformation), then the output buffer must
* have a capacity of at least length.
* If length==-1, then outData will not be used and can be NULL.
* @param pErrorCode ICU UErrorCode parameter, must not be NULL and must
* fulfill U_SUCCESS on input.
* @return The actual length of the data.
*
* @see UDataSwapper
* @internal ICU 2.8
*/
typedef int32_t U_CALLCONV
UDataSwapFn(const UDataSwapper *ds,
const void *inData, int32_t length, void *outData,
UErrorCode *pErrorCode);
/**
* Convert one uint16_t from input to platform endianness.
* @internal ICU 2.8
*/
typedef uint16_t U_CALLCONV
UDataReadUInt16(uint16_t x);
/**
* Convert one uint32_t from input to platform endianness.
* @internal ICU 2.8
*/
typedef uint32_t U_CALLCONV
UDataReadUInt32(uint32_t x);
/**
* Convert one uint16_t from platform to input endianness.
* @internal ICU 2.8
*/
typedef void U_CALLCONV
UDataWriteUInt16(uint16_t *p, uint16_t x);
/**
* Convert one uint32_t from platform to input endianness.
* @internal ICU 2.8
*/
typedef void U_CALLCONV
UDataWriteUInt32(uint32_t *p, uint32_t x);
/**
* Compare invariant-character strings, one in the output data and the
* other one caller-provided in Unicode.
* An output data string is compared because strings are usually swapped
* before the rest of the data, to allow for sorting of string tables
* according to the output charset.
* You can use -1 for the length parameters of NUL-terminated strings as usual.
* Returns Unicode code point order for invariant characters.
* @internal ICU 2.8
*/
typedef int32_t U_CALLCONV
UDataCompareInvChars(const UDataSwapper *ds,
const char *outString, int32_t outLength,
const UChar *localString, int32_t localLength);
/**
* Function for message output when an error occurs during data swapping.
* A format string and variable number of arguments are passed
* like for vprintf().
*
* @param context A function-specific context pointer.
* @param fmt The format string.
* @param args The arguments for format string inserts.
*
* @internal ICU 2.8
*/
typedef void U_CALLCONV
UDataPrintError(void *context, const char *fmt, va_list args);
struct UDataSwapper {
/** Input endianness. @internal ICU 2.8 */
UBool inIsBigEndian;
/** Input charset family. @see U_CHARSET_FAMILY @internal ICU 2.8 */
uint8_t inCharset;
/** Output endianness. @internal ICU 2.8 */
UBool outIsBigEndian;
/** Output charset family. @see U_CHARSET_FAMILY @internal ICU 2.8 */
uint8_t outCharset;
/* basic functions for reading data values */
/** Convert one uint16_t from input to platform endianness. @internal ICU 2.8 */
UDataReadUInt16 *readUInt16;
/** Convert one uint32_t from input to platform endianness. @internal ICU 2.8 */
UDataReadUInt32 *readUInt32;
/** Compare an invariant-character output string with a local one. @internal ICU 2.8 */
UDataCompareInvChars *compareInvChars;
/* basic functions for writing data values */
/** Convert one uint16_t from platform to input endianness. @internal ICU 2.8 */
UDataWriteUInt16 *writeUInt16;
/** Convert one uint32_t from platform to input endianness. @internal ICU 2.8 */
UDataWriteUInt32 *writeUInt32;
/* basic functions for data transformations */
/** Transform an array of 16-bit integers. @internal ICU 2.8 */
UDataSwapFn *swapArray16;
/** Transform an array of 32-bit integers. @internal ICU 2.8 */
UDataSwapFn *swapArray32;
/** Transform an array of 64-bit integers. @internal ICU 53 */
UDataSwapFn *swapArray64;
/** Transform an invariant-character string. @internal ICU 2.8 */
UDataSwapFn *swapInvChars;
/**
* Function for message output when an error occurs during data swapping.
* Can be NULL.
* @internal ICU 2.8
*/
UDataPrintError *printError;
/** Context pointer for printError. @internal ICU 2.8 */
void *printErrorContext;
};
U_CDECL_END
U_CAPI UDataSwapper * U_EXPORT2
udata_openSwapper(UBool inIsBigEndian, uint8_t inCharset,
UBool outIsBigEndian, uint8_t outCharset,
UErrorCode *pErrorCode);
/**
* Open a UDataSwapper for the given input data and the specified output
* characteristics.
* Values of -1 for any of the characteristics mean the local platform's
* characteristics.
*
* @see udata_swap
* @internal ICU 2.8
*/
U_CAPI UDataSwapper * U_EXPORT2
udata_openSwapperForInputData(const void *data, int32_t length,
UBool outIsBigEndian, uint8_t outCharset,
UErrorCode *pErrorCode);
U_CAPI void U_EXPORT2
udata_closeSwapper(UDataSwapper *ds);
/**
* Read the beginning of an ICU data piece, recognize magic bytes,
* swap the structure.
* Set a U_UNSUPPORTED_ERROR if it does not look like an ICU data piece.
*
* @return The size of the data header, in bytes.
*
* @internal ICU 2.8
*/
U_CAPI int32_t U_EXPORT2
udata_swapDataHeader(const UDataSwapper *ds,
const void *inData, int32_t length, void *outData,
UErrorCode *pErrorCode);
/**
* Convert one int16_t from input to platform endianness.
* @internal ICU 2.8
*/
U_CAPI int16_t U_EXPORT2
udata_readInt16(const UDataSwapper *ds, int16_t x);
/**
* Convert one int32_t from input to platform endianness.
* @internal ICU 2.8
*/
U_CAPI int32_t U_EXPORT2
udata_readInt32(const UDataSwapper *ds, int32_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);
U_CAPI void U_EXPORT2
udata_printError(const UDataSwapper *ds,
const char *fmt,
...);
/* internal exports from putil.c -------------------------------------------- */
/* declared here to keep them out of the public putil.h */
/**
* Swap invariant char * strings ASCII->EBCDIC.
* @internal
*/
U_CAPI int32_t U_EXPORT2
uprv_ebcdicFromAscii(const UDataSwapper *ds,
const void *inData, int32_t length, void *outData,
UErrorCode *pErrorCode);
/**
* Copy invariant ASCII char * strings and verify they are invariant.
* @internal
*/
U_CFUNC int32_t
uprv_copyAscii(const UDataSwapper *ds,
const void *inData, int32_t length, void *outData,
UErrorCode *pErrorCode);
/**
* Swap invariant char * strings EBCDIC->ASCII.
* @internal
*/
U_CFUNC int32_t
uprv_asciiFromEbcdic(const UDataSwapper *ds,
const void *inData, int32_t length, void *outData,
UErrorCode *pErrorCode);
/**
* Copy invariant EBCDIC char * strings and verify they are invariant.
* @internal
*/
U_CFUNC int32_t
uprv_copyEbcdic(const UDataSwapper *ds,
const void *inData, int32_t length, void *outData,
UErrorCode *pErrorCode);
/**
* Compare ASCII invariant char * with Unicode invariant UChar *
* @internal
*/
U_CFUNC int32_t
uprv_compareInvAscii(const UDataSwapper *ds,
const char *outString, int32_t outLength,
const UChar *localString, int32_t localLength);
/**
* Compare EBCDIC invariant char * with Unicode invariant UChar *
* @internal
*/
U_CFUNC int32_t
uprv_compareInvEbcdic(const UDataSwapper *ds,
const char *outString, int32_t outLength,
const UChar *localString, int32_t localLength);
/* material... -------------------------------------------------------------- */
#if 0
/* udata.h */
/**
* Public API function in udata.c
*
* Same as udata_openChoice() but automatically swaps the data.
* isAcceptable, if not NULL, may accept data with endianness and charset family
* different from the current platform's properties.
* If the data is acceptable and the platform properties do not match, then
* the swap function is called to swap an allocated version of the data.
* Preflighting may or may not be performed depending on whether the size of
* the loaded data item is known.
*
* @param isAcceptable Same as for udata_openChoice(). May be NULL.
*
* @internal ICU 2.8
*/
U_CAPI UDataMemory * U_EXPORT2
udata_openSwap(const char *path, const char *type, const char *name,
UDataMemoryIsAcceptable *isAcceptable, void *isAcceptableContext,
UDataSwapFn *swap,
UDataPrintError *printError, void *printErrorContext,
UErrorCode *pErrorCode);
#endif
#endif