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scuffed-code/icu4c/source/tools/toolutil/ucbuf.c
Steven R. Loomis 1ff6e9f8bc ICU-8909 warnings cleanup 
X-SVN-Rev: 30877
2011-10-26 23:56:35 +00:00

788 lines
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/*
*******************************************************************************
*
* Copyright (C) 1998-2011, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
*
* File ucbuf.c
*
* Modification History:
*
* Date Name Description
* 05/10/01 Ram Creation.
*******************************************************************************
*/
#include "unicode/utypes.h"
#include "unicode/putil.h"
#include "unicode/uchar.h"
#include "unicode/ucnv.h"
#include "unicode/ucnv_err.h"
#include "unicode/ustring.h"
#include "unicode/utf16.h"
#include "filestrm.h"
#include "cstring.h"
#include "cmemory.h"
#include "ustrfmt.h"
#include "ucbuf.h"
#include <stdio.h>
#if !UCONFIG_NO_CONVERSION
#define MAX_IN_BUF 1000
#define MAX_U_BUF 1500
#define CONTEXT_LEN 20
struct UCHARBUF {
UChar* buffer;
UChar* currentPos;
UChar* bufLimit;
int32_t bufCapacity;
int32_t remaining;
int32_t signatureLength;
FileStream* in;
UConverter* conv;
UBool showWarning; /* makes this API not produce any errors */
UBool isBuffered;
};
U_CAPI UBool U_EXPORT2
ucbuf_autodetect_fs(FileStream* in, const char** cp, UConverter** conv, int32_t* signatureLength, UErrorCode* error){
char start[8];
int32_t numRead;
UChar target[1]={ 0 };
UChar* pTarget;
const char* pStart;
/* read a few bytes */
numRead=T_FileStream_read(in, start, sizeof(start));
*cp = ucnv_detectUnicodeSignature(start, numRead, signatureLength, error);
/* unread the bytes beyond what was consumed for U+FEFF */
T_FileStream_rewind(in);
if (*signatureLength > 0) {
T_FileStream_read(in, start, *signatureLength);
}
if(*cp==NULL){
*conv =NULL;
return FALSE;
}
/* open the converter for the detected Unicode charset */
*conv = ucnv_open(*cp,error);
/* convert and ignore initial U+FEFF, and the buffer overflow */
pTarget = target;
pStart = start;
ucnv_toUnicode(*conv, &pTarget, target+1, &pStart, start+*signatureLength, NULL, FALSE, error);
*signatureLength = (int32_t)(pStart - start);
if(*error==U_BUFFER_OVERFLOW_ERROR) {
*error=U_ZERO_ERROR;
}
/* verify that we successfully read exactly U+FEFF */
if(U_SUCCESS(*error) && (pTarget!=(target+1) || target[0]!=0xfeff)) {
*error=U_INTERNAL_PROGRAM_ERROR;
}
return TRUE;
}
static UBool ucbuf_isCPKnown(const char* cp){
if(ucnv_compareNames("UTF-8",cp)==0){
return TRUE;
}
if(ucnv_compareNames("UTF-16BE",cp)==0){
return TRUE;
}
if(ucnv_compareNames("UTF-16LE",cp)==0){
return TRUE;
}
if(ucnv_compareNames("UTF-16",cp)==0){
return TRUE;
}
if(ucnv_compareNames("UTF-32",cp)==0){
return TRUE;
}
if(ucnv_compareNames("UTF-32BE",cp)==0){
return TRUE;
}
if(ucnv_compareNames("UTF-32LE",cp)==0){
return TRUE;
}
if(ucnv_compareNames("SCSU",cp)==0){
return TRUE;
}
if(ucnv_compareNames("BOCU-1",cp)==0){
return TRUE;
}
if(ucnv_compareNames("UTF-7",cp)==0){
return TRUE;
}
return FALSE;
}
U_CAPI FileStream * U_EXPORT2
ucbuf_autodetect(const char* fileName, const char** cp,UConverter** conv, int32_t* signatureLength,UErrorCode* error){
FileStream* in=NULL;
if(error==NULL || U_FAILURE(*error)){
return NULL;
}
if(conv==NULL || cp==NULL || fileName==NULL){
*error = U_ILLEGAL_ARGUMENT_ERROR;
return NULL;
}
/* open the file */
in= T_FileStream_open(fileName,"rb");
if(in == NULL){
*error=U_FILE_ACCESS_ERROR;
return NULL;
}
if(ucbuf_autodetect_fs(in,cp,conv,signatureLength,error)) {
return in;
} else {
ucnv_close(*conv);
*conv=NULL;
T_FileStream_close(in);
return NULL;
}
}
/* fill the uchar buffer */
static UCHARBUF*
ucbuf_fillucbuf( UCHARBUF* buf,UErrorCode* error){
UChar* pTarget=NULL;
UChar* target=NULL;
const char* source=NULL;
char carr[MAX_IN_BUF] = {'\0'};
char* cbuf = carr;
int32_t inputRead=0;
int32_t outputWritten=0;
int32_t offset=0;
const char* sourceLimit =NULL;
int32_t cbufSize=0;
pTarget = buf->buffer;
/* check if we arrived here without exhausting the buffer*/
if(buf->currentPos<buf->bufLimit){
offset = (int32_t)(buf->bufLimit-buf->currentPos);
memmove(buf->buffer,buf->currentPos,offset* sizeof(UChar));
}
#if DEBUG
memset(pTarget+offset,0xff,sizeof(UChar)*(MAX_IN_BUF-offset));
#endif
if(buf->isBuffered){
cbufSize = MAX_IN_BUF;
/* read the file */
inputRead=T_FileStream_read(buf->in,cbuf,cbufSize-offset);
buf->remaining-=inputRead;
}else{
cbufSize = T_FileStream_size(buf->in);
cbuf = (char*)uprv_malloc(cbufSize);
if (cbuf == NULL) {
*error = U_MEMORY_ALLOCATION_ERROR;
return NULL;
}
inputRead= T_FileStream_read(buf->in,cbuf,cbufSize);
buf->remaining-=inputRead;
}
/* just to be sure...*/
if ( 0 == inputRead )
buf->remaining = 0;
target=pTarget;
/* convert the bytes */
if(buf->conv){
/* set the callback to stop */
UConverterToUCallback toUOldAction ;
void* toUOldContext;
void* toUNewContext=NULL;
ucnv_setToUCallBack(buf->conv,
UCNV_TO_U_CALLBACK_STOP,
toUNewContext,
&toUOldAction,
(const void**)&toUOldContext,
error);
/* since state is saved in the converter we add offset to source*/
target = pTarget+offset;
source = cbuf;
sourceLimit = source + inputRead;
ucnv_toUnicode(buf->conv,&target,target+(buf->bufCapacity-offset),
&source,sourceLimit,NULL,
(UBool)(buf->remaining==0),error);
if(U_FAILURE(*error)){
char context[CONTEXT_LEN+1];
char preContext[CONTEXT_LEN+1];
char postContext[CONTEXT_LEN+1];
int8_t len = CONTEXT_LEN;
int32_t start=0;
int32_t stop =0;
int32_t pos =0;
/* use erro1 to preserve the error code */
UErrorCode error1 =U_ZERO_ERROR;
if( buf->showWarning==TRUE){
fprintf(stderr,"\n###WARNING: Encountered abnormal bytes while"
" converting input stream to target encoding: %s\n",
u_errorName(*error));
}
/* now get the context chars */
ucnv_getInvalidChars(buf->conv,context,&len,&error1);
context[len]= 0 ; /* null terminate the buffer */
pos = (int32_t)(source - cbuf - len);
/* for pre-context */
start = (pos <=CONTEXT_LEN)? 0 : (pos - (CONTEXT_LEN-1));
stop = pos-len;
memcpy(preContext,cbuf+start,stop-start);
/* null terminate the buffer */
preContext[stop-start] = 0;
/* for post-context */
start = pos+len;
stop = (int32_t)(((pos+CONTEXT_LEN)<= (sourceLimit-cbuf) )? (pos+(CONTEXT_LEN-1)) : (sourceLimit-cbuf));
memcpy(postContext,source,stop-start);
/* null terminate the buffer */
postContext[stop-start] = 0;
if(buf->showWarning ==TRUE){
/* print out the context */
fprintf(stderr,"\tPre-context: %s\n",preContext);
fprintf(stderr,"\tContext: %s\n",context);
fprintf(stderr,"\tPost-context: %s\n", postContext);
}
/* reset the converter */
ucnv_reset(buf->conv);
/* set the call back to substitute
* and restart conversion
*/
ucnv_setToUCallBack(buf->conv,
UCNV_TO_U_CALLBACK_SUBSTITUTE,
toUNewContext,
&toUOldAction,
(const void**)&toUOldContext,
&error1);
/* reset source and target start positions */
target = pTarget+offset;
source = cbuf;
/* re convert */
ucnv_toUnicode(buf->conv,&target,target+(buf->bufCapacity-offset),
&source,sourceLimit,NULL,
(UBool)(buf->remaining==0),&error1);
}
outputWritten = (int32_t)(target - pTarget);
#if DEBUG
{
int i;
target = pTarget;
for(i=0;i<numRead;i++){
/* printf("%c", (char)(*target++));*/
}
}
#endif
}else{
u_charsToUChars(cbuf,target+offset,inputRead);
outputWritten=((buf->remaining>cbufSize)? cbufSize:inputRead+offset);
}
buf->currentPos = pTarget;
buf->bufLimit=pTarget+outputWritten;
*buf->bufLimit=0; /*NUL terminate*/
if(cbuf!=carr){
uprv_free(cbuf);
}
return buf;
}
/* get a UChar from the stream*/
U_CAPI int32_t U_EXPORT2
ucbuf_getc(UCHARBUF* buf,UErrorCode* error){
if(error==NULL || U_FAILURE(*error)){
return FALSE;
}
if(buf->currentPos>=buf->bufLimit){
if(buf->remaining==0){
return U_EOF;
}
buf=ucbuf_fillucbuf(buf,error);
if(U_FAILURE(*error)){
return U_EOF;
}
}
return *(buf->currentPos++);
}
/* get a UChar32 from the stream*/
U_CAPI int32_t U_EXPORT2
ucbuf_getc32(UCHARBUF* buf,UErrorCode* error){
int32_t retVal = (int32_t)U_EOF;
if(error==NULL || U_FAILURE(*error)){
return FALSE;
}
if(buf->currentPos+1>=buf->bufLimit){
if(buf->remaining==0){
return U_EOF;
}
buf=ucbuf_fillucbuf(buf,error);
if(U_FAILURE(*error)){
return U_EOF;
}
}
if(U16_IS_LEAD(*(buf->currentPos))){
retVal=U16_GET_SUPPLEMENTARY(buf->currentPos[0],buf->currentPos[1]);
buf->currentPos+=2;
}else{
retVal = *(buf->currentPos++);
}
return retVal;
}
/* u_unescapeAt() callback to return a UChar*/
static UChar U_CALLCONV
_charAt(int32_t offset, void *context) {
return ((UCHARBUF*) context)->currentPos[offset];
}
/* getc and escape it */
U_CAPI int32_t U_EXPORT2
ucbuf_getcx32(UCHARBUF* buf,UErrorCode* error) {
int32_t length;
int32_t offset;
UChar32 c32,c1,c2;
if(error==NULL || U_FAILURE(*error)){
return FALSE;
}
/* Fill the buffer if it is empty */
if (buf->currentPos >=buf->bufLimit-2) {
ucbuf_fillucbuf(buf,error);
}
/* Get the next character in the buffer */
if (buf->currentPos < buf->bufLimit) {
c1 = *(buf->currentPos)++;
} else {
c1 = U_EOF;
}
c2 = *(buf->currentPos);
/* If it isn't a backslash, return it */
if (c1 != 0x005C) {
return c1;
}
/* Determine the amount of data in the buffer */
length = (int32_t)(buf->bufLimit - buf->currentPos);
/* The longest escape sequence is \Uhhhhhhhh; make sure
we have at least that many characters */
if (length < 10) {
/* fill the buffer */
ucbuf_fillucbuf(buf,error);
length = (int32_t)(buf->bufLimit - buf->buffer);
}
/* Process the escape */
offset = 0;
c32 = u_unescapeAt(_charAt, &offset, length, (void*)buf);
/* check if u_unescapeAt unescaped and converted
* to c32 or not
*/
if(c32==0xFFFFFFFF){
if(buf->showWarning) {
char context[CONTEXT_LEN+1];
int32_t len = CONTEXT_LEN;
if(length < len) {
len = length;
}
context[len]= 0 ; /* null terminate the buffer */
u_UCharsToChars( buf->currentPos, context, len);
fprintf(stderr,"Bad escape: [%c%s]...\n", (int)c1, context);
}
*error= U_ILLEGAL_ESCAPE_SEQUENCE;
return c1;
}else if(c32!=c2 || (c32==0x0075 && c2==0x0075 && c1==0x005C) /* for \u0075 c2=0x0075 and c32==0x0075*/){
/* Update the current buffer position */
buf->currentPos += offset;
}else{
/* unescaping failed so we just return
* c1 and not consume the buffer
* this is useful for rules with escapes
* in resouce bundles
* eg: \' \\ \"
*/
return c1;
}
return c32;
}
U_CAPI UCHARBUF* U_EXPORT2
ucbuf_open(const char* fileName,const char** cp,UBool showWarning, UBool buffered, UErrorCode* error){
FileStream* in = NULL;
int32_t fileSize=0;
const char* knownCp;
if(error==NULL || U_FAILURE(*error)){
return NULL;
}
if(cp==NULL || fileName==NULL){
*error = U_ILLEGAL_ARGUMENT_ERROR;
return FALSE;
}
if (!uprv_strcmp(fileName, "-")) {
in = T_FileStream_stdin();
}else{
in = T_FileStream_open(fileName, "rb");
}
if(in!=NULL){
UCHARBUF* buf =(UCHARBUF*) uprv_malloc(sizeof(UCHARBUF));
fileSize = T_FileStream_size(in);
if(buf == NULL){
*error = U_MEMORY_ALLOCATION_ERROR;
T_FileStream_close(in);
return NULL;
}
buf->in=in;
buf->conv=NULL;
buf->showWarning = showWarning;
buf->isBuffered = buffered;
buf->signatureLength=0;
if(*cp==NULL || **cp=='\0'){
/* don't have code page name... try to autodetect */
ucbuf_autodetect_fs(in,cp,&buf->conv,&buf->signatureLength,error);
}else if(ucbuf_isCPKnown(*cp)){
/* discard BOM */
ucbuf_autodetect_fs(in,&knownCp,&buf->conv,&buf->signatureLength,error);
}
if(U_SUCCESS(*error) && buf->conv==NULL) {
buf->conv=ucnv_open(*cp,error);
}
if(U_FAILURE(*error)){
ucnv_close(buf->conv);
uprv_free(buf);
T_FileStream_close(in);
return NULL;
}
if((buf->conv==NULL) && (buf->showWarning==TRUE)){
fprintf(stderr,"###WARNING: No converter defined. Using codepage of system.\n");
}
buf->remaining=fileSize-buf->signatureLength;
if(buf->isBuffered){
buf->bufCapacity=MAX_U_BUF;
}else{
buf->bufCapacity=buf->remaining+buf->signatureLength+1/*for terminating nul*/;
}
buf->buffer=(UChar*) uprv_malloc(U_SIZEOF_UCHAR * buf->bufCapacity );
if (buf->buffer == NULL) {
*error = U_MEMORY_ALLOCATION_ERROR;
ucbuf_close(buf);
return NULL;
}
buf->currentPos=buf->buffer;
buf->bufLimit=buf->buffer;
if(U_FAILURE(*error)){
fprintf(stderr, "Could not open codepage [%s]: %s\n", *cp, u_errorName(*error));
ucbuf_close(buf);
return NULL;
}
ucbuf_fillucbuf(buf,error);
if(U_FAILURE(*error)){
ucbuf_close(buf);
return NULL;
}
return buf;
}
*error =U_FILE_ACCESS_ERROR;
return NULL;
}
/* TODO: this method will fail if at the
* begining of buffer and the uchar to unget
* is from the previous buffer. Need to implement
* system to take care of that situation.
*/
U_CAPI void U_EXPORT2
ucbuf_ungetc(int32_t c,UCHARBUF* buf){
/* decrement currentPos pointer
* if not at the begining of buffer
*/
if(buf->currentPos!=buf->buffer){
if(*(buf->currentPos-1)==c){
buf->currentPos--;
} else {
/* ungetc failed - did not match. */
}
} else {
/* ungetc failed - beginning of buffer. */
}
}
/* frees the resources of UChar* buffer */
static void
ucbuf_closebuf(UCHARBUF* buf){
uprv_free(buf->buffer);
buf->buffer = NULL;
}
/* close the buf and release resources*/
U_CAPI void U_EXPORT2
ucbuf_close(UCHARBUF* buf){
if(buf!=NULL){
if(buf->conv){
ucnv_close(buf->conv);
}
T_FileStream_close(buf->in);
ucbuf_closebuf(buf);
uprv_free(buf);
}
}
/* rewind the buf and file stream */
U_CAPI void U_EXPORT2
ucbuf_rewind(UCHARBUF* buf,UErrorCode* error){
if(error==NULL || U_FAILURE(*error)){
return;
}
if(buf){
buf->currentPos=buf->buffer;
buf->bufLimit=buf->buffer;
T_FileStream_rewind(buf->in);
buf->remaining=T_FileStream_size(buf->in)-buf->signatureLength;
ucnv_resetToUnicode(buf->conv);
if(buf->signatureLength>0) {
UChar target[1]={ 0 };
UChar* pTarget;
char start[8];
const char* pStart;
int32_t numRead;
/* read the signature bytes */
numRead=T_FileStream_read(buf->in, start, buf->signatureLength);
/* convert and ignore initial U+FEFF, and the buffer overflow */
pTarget = target;
pStart = start;
ucnv_toUnicode(buf->conv, &pTarget, target+1, &pStart, start+numRead, NULL, FALSE, error);
if(*error==U_BUFFER_OVERFLOW_ERROR) {
*error=U_ZERO_ERROR;
}
/* verify that we successfully read exactly U+FEFF */
if(U_SUCCESS(*error) && (numRead!=buf->signatureLength || pTarget!=(target+1) || target[0]!=0xfeff)) {
*error=U_INTERNAL_PROGRAM_ERROR;
}
}
}
}
U_CAPI int32_t U_EXPORT2
ucbuf_size(UCHARBUF* buf){
if(buf){
if(buf->isBuffered){
return (T_FileStream_size(buf->in)-buf->signatureLength)/ucnv_getMinCharSize(buf->conv);
}else{
return (int32_t)(buf->bufLimit - buf->buffer);
}
}
return 0;
}
U_CAPI const UChar* U_EXPORT2
ucbuf_getBuffer(UCHARBUF* buf,int32_t* len,UErrorCode* error){
if(error==NULL || U_FAILURE(*error)){
return NULL;
}
if(buf==NULL || len==NULL){
*error = U_ILLEGAL_ARGUMENT_ERROR;
return NULL;
}
*len = (int32_t)(buf->bufLimit - buf->buffer);
return buf->buffer;
}
U_CAPI const char* U_EXPORT2
ucbuf_resolveFileName(const char* inputDir, const char* fileName, char* target, int32_t* len, UErrorCode* status){
int32_t requiredLen = 0;
int32_t dirlen = 0;
int32_t filelen = 0;
if(status==NULL || U_FAILURE(*status)){
return NULL;
}
if(inputDir == NULL || fileName == NULL || len==NULL || (target==NULL && *len>0)){
*status = U_ILLEGAL_ARGUMENT_ERROR;
return NULL;
}
dirlen = (int32_t)uprv_strlen(inputDir);
filelen = (int32_t)uprv_strlen(fileName);
if(inputDir[dirlen-1] != U_FILE_SEP_CHAR) {
requiredLen = dirlen + filelen + 2;
if((*len < requiredLen) || target==NULL){
*len = requiredLen;
*status = U_BUFFER_OVERFLOW_ERROR;
return NULL;
}
target[0] = '\0';
/*
* append the input dir to openFileName if the first char in
* filename is not file seperation char and the last char input directory is not '.'.
* This is to support :
* genrb -s. /home/icu/data
* genrb -s. icu/data
* The user cannot mix notations like
* genrb -s. /icu/data --- the absolute path specified. -s redundant
* user should use
* genrb -s. icu/data --- start from CWD and look in icu/data dir
*/
if( (fileName[0] != U_FILE_SEP_CHAR) && (inputDir[dirlen-1] !='.')){
uprv_strcpy(target, inputDir);
target[dirlen] = U_FILE_SEP_CHAR;
}
target[dirlen + 1] = '\0';
} else {
requiredLen = dirlen + filelen + 1;
if((*len < requiredLen) || target==NULL){
*len = requiredLen;
*status = U_BUFFER_OVERFLOW_ERROR;
return NULL;
}
uprv_strcpy(target, inputDir);
}
uprv_strcat(target, fileName);
return target;
}
/*
* Unicode TR 13 says any of the below chars is
* a new line char in a readline function in addition
* to CR+LF combination which needs to be
* handled seperately
*/
static UBool ucbuf_isCharNewLine(UChar c){
switch(c){
case 0x000A: /* LF */
case 0x000D: /* CR */
case 0x000C: /* FF */
case 0x0085: /* NEL */
case 0x2028: /* LS */
case 0x2029: /* PS */
return TRUE;
default:
return FALSE;
}
}
U_CAPI const UChar* U_EXPORT2
ucbuf_readline(UCHARBUF* buf,int32_t* len,UErrorCode* err){
UChar* temp = buf->currentPos;
UChar* savePos =NULL;
UChar c=0x0000;
if(buf->isBuffered){
/* The input is buffered we have to do more
* for returning a pointer U_TRUNCATED_CHAR_FOUND
*/
for(;;){
c = *temp++;
if(buf->remaining==0){
return NULL; /* end of file is reached return NULL */
}
if(temp>=buf->bufLimit && buf->currentPos == buf->buffer){
*err= U_TRUNCATED_CHAR_FOUND;
return NULL;
}else{
ucbuf_fillucbuf(buf,err);
if(U_FAILURE(*err)){
return NULL;
}
}
/*
* Accoding to TR 13 readLine functions must interpret
* CR, CR+LF, LF, NEL, PS, LS or FF as line seperators
*/
/* Windows CR LF */
if(c ==0x0d && temp+1<=buf->bufLimit && *(temp+1) == 0x0a ){
*len = (int32_t)(temp++ - buf->currentPos);
savePos = buf->currentPos;
buf->currentPos = temp;
return savePos;
}
/* else */
if (temp>=buf->bufLimit|| ucbuf_isCharNewLine(c)){ /* Unipad inserts 2028 line separators! */
*len = (int32_t)(temp - buf->currentPos);
savePos = buf->currentPos;
buf->currentPos = temp;
return savePos;
}
}
}else{
/* we know that all input is read into the internal
* buffer so we can safely return pointers
*/
for(;;){
c = *temp++;
if(buf->currentPos==buf->bufLimit){
return NULL; /* end of file is reached return NULL */
}
/* Windows CR LF */
if(c ==0x0d && temp+1<=buf->bufLimit && *(temp+1) == 0x0a ){
*len = (int32_t)(temp++ - buf->currentPos);
savePos = buf->currentPos;
buf->currentPos = temp;
return savePos;
}
/* else */
if (temp>=buf->bufLimit|| ucbuf_isCharNewLine(c)) { /* Unipad inserts 2028 line separators! */
*len = (int32_t)(temp - buf->currentPos);
savePos = buf->currentPos;
buf->currentPos = temp;
return savePos;
}
}
}
/* not reached */
/* A compiler warning will appear if all paths don't contain a return statement. */
/* return NULL;*/
}
#endif
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