352 lines
11 KiB
C
352 lines
11 KiB
C
/*
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*******************************************************************************
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*
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* Copyright (C) 2003-2014, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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* file name: udataswp.h
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2003jun05
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* created by: Markus W. Scherer
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*
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* Definitions for ICU data transformations for different platforms,
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* changing between big- and little-endian data and/or between
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* charset families (ASCII<->EBCDIC).
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*/
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#ifndef __UDATASWP_H__
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#define __UDATASWP_H__
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#include <stdarg.h>
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#include "unicode/utypes.h"
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/* forward declaration */
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U_CDECL_BEGIN
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struct UDataSwapper;
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typedef struct UDataSwapper UDataSwapper;
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/**
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* Function type for data transformation.
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* Transforms data, or just returns the length of the data if
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* the input length is -1.
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* Swap functions assume that their data pointers are aligned properly.
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*
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* Quick implementation outline:
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* (best to copy and adapt and existing swapper implementation)
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* check that the data looks like the expected format
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* if(length<0) {
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* preflight:
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* never dereference outData
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* read inData and determine the data size
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* assume that inData is long enough for this
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* } else {
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* outData can be NULL if length==0
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* inData==outData (in-place swapping) possible but not required!
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* verify that length>=(actual size)
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* if there is a chance that not every byte up to size is reached
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* due to padding etc.:
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* if(inData!=outData) {
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* memcpy(outData, inData, actual size);
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* }
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* swap contents
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* }
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* return actual size
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*
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* Further implementation notes:
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* - read integers from inData before swapping them
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* because in-place swapping can make them unreadable
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* - compareInvChars compares a local Unicode string with already-swapped
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* output charset strings
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*
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* @param ds Pointer to UDataSwapper containing global data about the
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* transformation and function pointers for handling primitive
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* types.
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* @param inData Pointer to the input data to be transformed or examined.
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* @param length Length of the data, counting bytes. May be -1 for preflighting.
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* If length>=0, then transform the data.
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* If length==-1, then only determine the length of the data.
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* The length cannot be determined from the data itself for all
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* types of data (e.g., not for simple arrays of integers).
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* @param outData Pointer to the output data buffer.
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* If length>=0 (transformation), then the output buffer must
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* have a capacity of at least length.
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* If length==-1, then outData will not be used and can be NULL.
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* @param pErrorCode ICU UErrorCode parameter, must not be NULL and must
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* fulfill U_SUCCESS on input.
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* @return The actual length of the data.
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*
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* @see UDataSwapper
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* @internal ICU 2.8
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*/
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typedef int32_t U_CALLCONV
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UDataSwapFn(const UDataSwapper *ds,
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const void *inData, int32_t length, void *outData,
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UErrorCode *pErrorCode);
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/**
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* Convert one uint16_t from input to platform endianness.
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* @internal ICU 2.8
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*/
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typedef uint16_t U_CALLCONV
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UDataReadUInt16(uint16_t x);
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/**
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* Convert one uint32_t from input to platform endianness.
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* @internal ICU 2.8
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*/
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typedef uint32_t U_CALLCONV
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UDataReadUInt32(uint32_t x);
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/**
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* Convert one uint16_t from platform to input endianness.
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* @internal ICU 2.8
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*/
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typedef void U_CALLCONV
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UDataWriteUInt16(uint16_t *p, uint16_t x);
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/**
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* Convert one uint32_t from platform to input endianness.
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* @internal ICU 2.8
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*/
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typedef void U_CALLCONV
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UDataWriteUInt32(uint32_t *p, uint32_t x);
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/**
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* Compare invariant-character strings, one in the output data and the
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* other one caller-provided in Unicode.
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* An output data string is compared because strings are usually swapped
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* before the rest of the data, to allow for sorting of string tables
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* according to the output charset.
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* You can use -1 for the length parameters of NUL-terminated strings as usual.
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* Returns Unicode code point order for invariant characters.
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* @internal ICU 2.8
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*/
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typedef int32_t U_CALLCONV
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UDataCompareInvChars(const UDataSwapper *ds,
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const char *outString, int32_t outLength,
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const UChar *localString, int32_t localLength);
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/**
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* Function for message output when an error occurs during data swapping.
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* A format string and variable number of arguments are passed
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* like for vprintf().
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*
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* @param context A function-specific context pointer.
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* @param fmt The format string.
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* @param args The arguments for format string inserts.
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*
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* @internal ICU 2.8
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*/
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typedef void U_CALLCONV
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UDataPrintError(void *context, const char *fmt, va_list args);
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struct UDataSwapper {
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/** Input endianness. @internal ICU 2.8 */
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UBool inIsBigEndian;
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/** Input charset family. @see U_CHARSET_FAMILY @internal ICU 2.8 */
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uint8_t inCharset;
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/** Output endianness. @internal ICU 2.8 */
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UBool outIsBigEndian;
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/** Output charset family. @see U_CHARSET_FAMILY @internal ICU 2.8 */
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uint8_t outCharset;
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/* basic functions for reading data values */
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/** Convert one uint16_t from input to platform endianness. @internal ICU 2.8 */
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UDataReadUInt16 *readUInt16;
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/** Convert one uint32_t from input to platform endianness. @internal ICU 2.8 */
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UDataReadUInt32 *readUInt32;
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/** Compare an invariant-character output string with a local one. @internal ICU 2.8 */
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UDataCompareInvChars *compareInvChars;
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/* basic functions for writing data values */
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/** Convert one uint16_t from platform to input endianness. @internal ICU 2.8 */
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UDataWriteUInt16 *writeUInt16;
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/** Convert one uint32_t from platform to input endianness. @internal ICU 2.8 */
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UDataWriteUInt32 *writeUInt32;
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/* basic functions for data transformations */
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/** Transform an array of 16-bit integers. @internal ICU 2.8 */
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UDataSwapFn *swapArray16;
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/** Transform an array of 32-bit integers. @internal ICU 2.8 */
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UDataSwapFn *swapArray32;
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/** Transform an array of 64-bit integers. @internal ICU 53 */
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UDataSwapFn *swapArray64;
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/** Transform an invariant-character string. @internal ICU 2.8 */
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UDataSwapFn *swapInvChars;
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/**
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* Function for message output when an error occurs during data swapping.
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* Can be NULL.
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* @internal ICU 2.8
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*/
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UDataPrintError *printError;
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/** Context pointer for printError. @internal ICU 2.8 */
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void *printErrorContext;
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};
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U_CDECL_END
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U_CAPI UDataSwapper * U_EXPORT2
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udata_openSwapper(UBool inIsBigEndian, uint8_t inCharset,
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UBool outIsBigEndian, uint8_t outCharset,
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UErrorCode *pErrorCode);
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/**
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* Open a UDataSwapper for the given input data and the specified output
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* characteristics.
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* Values of -1 for any of the characteristics mean the local platform's
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* characteristics.
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*
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* @see udata_swap
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* @internal ICU 2.8
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*/
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U_CAPI UDataSwapper * U_EXPORT2
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udata_openSwapperForInputData(const void *data, int32_t length,
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UBool outIsBigEndian, uint8_t outCharset,
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UErrorCode *pErrorCode);
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U_CAPI void U_EXPORT2
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udata_closeSwapper(UDataSwapper *ds);
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/**
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* Read the beginning of an ICU data piece, recognize magic bytes,
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* swap the structure.
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* Set a U_UNSUPPORTED_ERROR if it does not look like an ICU data piece.
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*
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* @return The size of the data header, in bytes.
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*
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* @internal ICU 2.8
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*/
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U_CAPI int32_t U_EXPORT2
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udata_swapDataHeader(const UDataSwapper *ds,
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const void *inData, int32_t length, void *outData,
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UErrorCode *pErrorCode);
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/**
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* Convert one int16_t from input to platform endianness.
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* @internal ICU 2.8
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*/
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U_CAPI int16_t U_EXPORT2
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udata_readInt16(const UDataSwapper *ds, int16_t x);
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/**
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* Convert one int32_t from input to platform endianness.
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* @internal ICU 2.8
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*/
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U_CAPI int32_t U_EXPORT2
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udata_readInt32(const UDataSwapper *ds, int32_t x);
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/**
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* Swap a block of invariant, NUL-terminated strings, but not padding
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* bytes after the last string.
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* @internal
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*/
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U_CAPI int32_t U_EXPORT2
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udata_swapInvStringBlock(const UDataSwapper *ds,
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const void *inData, int32_t length, void *outData,
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UErrorCode *pErrorCode);
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U_CAPI void U_EXPORT2
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udata_printError(const UDataSwapper *ds,
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const char *fmt,
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...);
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/* internal exports from putil.c -------------------------------------------- */
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/* declared here to keep them out of the public putil.h */
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/**
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* Swap invariant char * strings ASCII->EBCDIC.
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* @internal
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*/
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U_CAPI int32_t U_EXPORT2
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uprv_ebcdicFromAscii(const UDataSwapper *ds,
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const void *inData, int32_t length, void *outData,
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UErrorCode *pErrorCode);
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/**
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* Copy invariant ASCII char * strings and verify they are invariant.
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* @internal
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*/
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U_CFUNC int32_t
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uprv_copyAscii(const UDataSwapper *ds,
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const void *inData, int32_t length, void *outData,
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UErrorCode *pErrorCode);
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/**
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* Swap invariant char * strings EBCDIC->ASCII.
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* @internal
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*/
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U_CFUNC int32_t
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uprv_asciiFromEbcdic(const UDataSwapper *ds,
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const void *inData, int32_t length, void *outData,
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UErrorCode *pErrorCode);
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/**
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* Copy invariant EBCDIC char * strings and verify they are invariant.
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* @internal
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*/
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U_CFUNC int32_t
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uprv_copyEbcdic(const UDataSwapper *ds,
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const void *inData, int32_t length, void *outData,
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UErrorCode *pErrorCode);
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/**
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* Compare ASCII invariant char * with Unicode invariant UChar *
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* @internal
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*/
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U_CFUNC int32_t
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uprv_compareInvAscii(const UDataSwapper *ds,
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const char *outString, int32_t outLength,
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const UChar *localString, int32_t localLength);
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/**
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* Compare EBCDIC invariant char * with Unicode invariant UChar *
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* @internal
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*/
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U_CFUNC int32_t
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uprv_compareInvEbcdic(const UDataSwapper *ds,
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const char *outString, int32_t outLength,
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const UChar *localString, int32_t localLength);
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/* material... -------------------------------------------------------------- */
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#if 0
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/* udata.h */
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/**
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* Public API function in udata.c
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*
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* Same as udata_openChoice() but automatically swaps the data.
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* isAcceptable, if not NULL, may accept data with endianness and charset family
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* different from the current platform's properties.
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* If the data is acceptable and the platform properties do not match, then
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* the swap function is called to swap an allocated version of the data.
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* Preflighting may or may not be performed depending on whether the size of
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* the loaded data item is known.
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*
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* @param isAcceptable Same as for udata_openChoice(). May be NULL.
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*
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* @internal ICU 2.8
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*/
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U_CAPI UDataMemory * U_EXPORT2
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udata_openSwap(const char *path, const char *type, const char *name,
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UDataMemoryIsAcceptable *isAcceptable, void *isAcceptableContext,
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UDataSwapFn *swap,
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UDataPrintError *printError, void *printErrorContext,
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UErrorCode *pErrorCode);
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#endif
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#endif
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