The Tor Browser: intl/icu/source/common/udataswp.c@b8a032363ba2 (annotated)

intl/icu/source/common/udataswp.c@b8a032363ba2 (annotated)

intl/icu/source/common/udataswp.c

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /*
 *******************************************************************************
 *
 *   Copyright (C) 2003, International Business Machines
 *   Corporation and others.  All Rights Reserved.
 *
 *******************************************************************************
 *   file name:  udataswp.c
 *   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).
 */
 #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==NULL || U_FAILURE(*pErrorCode)) {
         return 0;
     }
     if(ds==NULL || inData==NULL || length<0 || (length&1)!=0 || outData==NULL) {
         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
         return 0;
     }
     /* setup and swapping */
     p=(const uint16_t *)inData;
     q=(uint16_t *)outData;
     count=length/2;
     while(count>0) {
         x=*p++;
         *q++=(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==NULL || U_FAILURE(*pErrorCode)) {
         return 0;
     }
     if(ds==NULL || inData==NULL || length<0 || (length&1)!=0 || outData==NULL) {
         *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==NULL || U_FAILURE(*pErrorCode)) {
         return 0;
     }
     if(ds==NULL || inData==NULL || length<0 || (length&3)!=0 || outData==NULL) {
         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
         return 0;
     }
     /* setup and swapping */
     p=(const uint32_t *)inData;
     q=(uint32_t *)outData;
     count=length/4;
     while(count>0) {
         x=*p++;
         *q++=(uint32_t)((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==NULL || U_FAILURE(*pErrorCode)) {
         return 0;
     }
     if(ds==NULL || inData==NULL || length<0 || (length&3)!=0 || outData==NULL) {
         *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 (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 (uint32_t)((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=(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=(uint32_t)((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==NULL || U_FAILURE(*pErrorCode)) {
         return 0;
     }
     if(ds==NULL || inData==NULL || length<0 || (length>0 && outData==NULL)) {
         *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!=NULL) {
         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==NULL || U_FAILURE(*pErrorCode)) {
         return 0;
     }
     if(ds==NULL || inData==NULL || length<-1 || (length>0 && outData==NULL)) {
         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
         return 0;
     }
     /* check minimum length and magic bytes */
     pHeader=(const DataHeader *)inData;
     if( (length>=0 && length<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==NULL || U_FAILURE(*pErrorCode)) {
         return NULL;
     }
     if(inCharset>U_EBCDIC_FAMILY || outCharset>U_EBCDIC_FAMILY) {
         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
         return NULL;
     }
     /* allocate the swapper */
     swapper=uprv_malloc(sizeof(UDataSwapper));
     if(swapper==NULL) {
         *pErrorCode=U_MEMORY_ALLOCATION_ERROR;
         return NULL;
     }
     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;
     swapper->swapArray16= inIsBigEndian==outIsBigEndian ? uprv_copyArray16 : uprv_swapArray16;
     swapper->swapArray32= inIsBigEndian==outIsBigEndian ? uprv_copyArray32 : uprv_swapArray32;
     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==NULL || U_FAILURE(*pErrorCode)) {
         return NULL;
     }
     if( data==NULL ||
         (length>=0 && length<sizeof(DataHeader)) ||
         outCharset>U_EBCDIC_FAMILY
     ) {
         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
         return NULL;
     }
     pHeader=(const DataHeader *)data;
     if( (length>=0 && length<sizeof(DataHeader)) ||
         pHeader->dataHeader.magic1!=0xda ||
         pHeader->dataHeader.magic2!=0x27 ||
         pHeader->info.sizeofUChar!=2
     ) {
         *pErrorCode=U_UNSUPPORTED_ERROR;
         return 0;
     }
     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 0;
     }
     return udata_openSwapper(inIsBigEndian, inCharset, outIsBigEndian, outCharset, pErrorCode);
 }
 U_CAPI void U_EXPORT2
 udata_closeSwapper(UDataSwapper *ds) {
     uprv_free(ds);
 }

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intl/icu/source/common/udataswp.c@b8a032363ba2 (annotated)

intl/icu/source/common/udataswp.c