305 lines
7.9 KiB
C
305 lines
7.9 KiB
C
/*
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*******************************************************************************
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*
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* Copyright (C) 1998-2001, 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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*
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* File ucbuf.c
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*
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* Modification History:
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*
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* Date Name Description
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* 05/10/01 Ram Creation.
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*******************************************************************************
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*/
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#include "unicode/utypes.h"
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#include "unicode/ucnv.h"
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#include "filestrm.h"
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#include "cmemory.h"
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#include "unicode/ustring.h"
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#include "ucbuf.h"
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#define MAX_IN_BUF 1000
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#define MAX_U_BUF 1500
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static UBool ucbuf_autodetect_nrw(FileStream* in, const char** cp,int* numRead){
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/* initial 0xa5 bytes: make sure that if we read <4 bytes we don't misdetect something */
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char start[4]={ '\xa5', '\xa5', '\xa5', '\xa5' };
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int cap =T_FileStream_size(in);
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UBool autodetect;
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int signatureLength;
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*numRead=0;
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*cp="";
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if(cap<=0) {
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return FALSE;
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}
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autodetect = TRUE;
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*numRead=T_FileStream_read(in, start, 4); /* *numRead might be <4 */
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if(start[0] == '\xFE' && start[1] == '\xFF') {
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*cp = "UTF-16BE";
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signatureLength=2;
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} else if(start[0] == '\xFF' && start[1] == '\xFE') {
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if(start[2] == '\x00' && start[3] =='\x00'){
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*cp="UTF-32LE";
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signatureLength=4;
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} else {
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*cp = "UTF-16LE";
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signatureLength=2;
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}
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} else if(start[0] == '\xEF' && start[1] == '\xBB' && start[2] == '\xBF') {
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*cp = "UTF-8";
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signatureLength=3;
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}else if(start[0] == '\x0E' && start[1] == '\xFE' && start[2] == '\xFF'){
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*cp ="SCSU";
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signatureLength=3;
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}else if(start[0] == '\x00' && start[1] == '\x00' &&
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start[2] == '\xFF' && start[3]=='\xFE'){
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*cp = "UTF-32BE";
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signatureLength=4;
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}else{
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signatureLength=0;
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autodetect=FALSE;
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}
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while(signatureLength<*numRead) {
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T_FileStream_ungetc(start[--*numRead], in);
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}
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return autodetect;
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}
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/* Autodetects UTF8, UTF-16-BigEndian and UTF-16-LittleEndian BOMs*/
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U_CAPI UBool U_EXPORT2
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ucbuf_autodetect(FileStream* in,const char** cp){
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UBool autodetect = FALSE;
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int numRead =0;
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const char* tcp;
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autodetect=ucbuf_autodetect_nrw(in,&tcp, &numRead);
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*cp =tcp;
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/* rewind the file Stream */
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T_FileStream_rewind(in);
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return autodetect;
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}
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/* fill the uchar buffer */
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static UCHARBUF*
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ucbuf_fillucbuf( UCHARBUF* buf,UErrorCode* err){
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UChar* pTarget=NULL;
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UChar* target=NULL;
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const char* source=NULL;
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char cbuf[MAX_IN_BUF] = {'\0'};
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int numRead=0;
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int offset=0;
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pTarget = buf->buffer;
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/* check if we arrived here without exhausting the buffer*/
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if(buf->currentPos<buf->bufLimit){
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offset= buf->bufLimit-buf->currentPos;
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memmove(buf->buffer,buf->currentPos,offset* sizeof(UChar));
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}
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#if DEBUG
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memset(pTarget+offset,0xff,sizeof(UChar)*(MAX_IN_BUF-offset));
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#endif
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/* read the file */
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numRead=T_FileStream_read(buf->in,cbuf,MAX_IN_BUF-offset);
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buf->remaining-=numRead;
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target=pTarget;
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/* convert the bytes */
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if(buf->conv){
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/* since state is saved in the converter we add offset to source*/
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target = pTarget+offset;
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source = cbuf;
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ucnv_toUnicode(buf->conv,&target,target+(MAX_U_BUF-offset),
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&source,source+numRead,NULL,
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(UBool)(buf->remaining==0),err);
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numRead= target-pTarget;
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if(U_FAILURE(*err)){
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return NULL;
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}
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}else{
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u_charsToUChars(cbuf,target+offset,numRead);
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numRead=((buf->remaining>MAX_IN_BUF)? MAX_IN_BUF:numRead+offset);
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}
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buf->currentPos = pTarget;
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buf->bufLimit=pTarget+numRead;
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return buf;
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}
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/* get a UChar from the stream*/
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U_CAPI UChar32 U_EXPORT2
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ucbuf_getc(UCHARBUF* buf,UErrorCode* err){
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if(buf->currentPos>=buf->bufLimit){
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if(buf->remaining==0){
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return U_EOF;
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}
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buf=ucbuf_fillucbuf(buf,err);
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if(U_FAILURE(*err)){
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return U_EOF;
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}
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}
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return *(buf->currentPos++);
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}
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/* u_unescapeAt() callback to return a UChar*/
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static UChar
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_charAt(int32_t offset, void *context) {
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return ((UCHARBUF*) context)->currentPos[offset];
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}
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/* getc and escape it */
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U_CAPI UChar32 U_EXPORT2
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ucbuf_getcx(UCHARBUF* buf,UErrorCode* err) {
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int32_t length;
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int32_t offset;
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UChar32 c32,c1,c2;
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/* Fill the buffer if it is empty */
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if (buf->currentPos >=buf->bufLimit-2) {
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ucbuf_fillucbuf(buf,err);
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}
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/* Get the next character in the buffer */
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if (buf->currentPos < buf->bufLimit) {
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c1 = *(buf->currentPos)++;
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} else {
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c1 = U_EOF;
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}
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c2 = *(buf->currentPos);
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/* If it isn't a backslash, return it */
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if (c1 != 0x005C) {
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return c1;
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}
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/* Determine the amount of data in the buffer */
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length = buf->bufLimit-buf->currentPos;
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/* The longest escape sequence is \Uhhhhhhhh; make sure
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we have at least that many characters */
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if (length < 10) {
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/* fill the buffer */
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ucbuf_fillucbuf(buf,err);
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length = buf->bufLimit-buf->buffer;
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}
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/* Process the escape */
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offset = 0;
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c32 = u_unescapeAt(_charAt, &offset, length, (void*)buf);
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/* check if u_unescapeAt unescaped and converted
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* to c32 or not
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*/
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if(c32!=c2){
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/* Update the current buffer position */
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buf->currentPos += offset;
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}else{
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/* unescaping failed so we just return
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* c1 and not consume the buffer
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* this is useful for rules with escapes
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* in resouce bundles
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* eg: \' \\ \"
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*/
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return c1;
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}
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return c32;
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}
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/* open a UCHARBUF */
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U_CAPI UCHARBUF* U_EXPORT2
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ucbuf_open(FileStream* in, UErrorCode* err){
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UCHARBUF* buf =(UCHARBUF*) uprv_malloc(sizeof(UCHARBUF));
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const char *cp;
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int numRead =0;
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if(U_FAILURE(*err)){
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return NULL;
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}
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if(buf){
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buf->in=in;
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ucbuf_autodetect_nrw(in,&cp,&numRead);
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buf->remaining=T_FileStream_size(in)-numRead;
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buf->buffer=(UChar*) uprv_malloc(sizeof(UChar)* MAX_U_BUF);
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if (buf->buffer == NULL) {
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*err = U_MEMORY_ALLOCATION_ERROR;
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return NULL;
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}
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buf->currentPos=buf->buffer;
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buf->bufLimit=buf->buffer;
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if(*cp!='\0'){
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buf->conv=ucnv_open(cp,err);
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}else{
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buf->conv=NULL;
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}
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if(U_FAILURE(*err)){
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fprintf(stderr, "Could not open codepage [%s]: %s\n", cp, u_errorName(*err));
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return NULL;
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}
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buf=ucbuf_fillucbuf(buf,err);
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return buf;
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}else{
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*err = U_MEMORY_ALLOCATION_ERROR;
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return NULL;
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}
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}
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/* TODO: this method will fail if at the
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* begining of buffer and the uchar to unget
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* is from the previous buffer. Need to implement
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* system to take care of that situation.
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*/
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U_CAPI void U_EXPORT2
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ucbuf_ungetc(UChar32 c,UCHARBUF* buf){
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/* decrement currentPos pointer
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* if not at the begining of buffer
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*/
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if(buf->currentPos!=buf->buffer){
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buf->currentPos--;
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}
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}
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/* frees the resources of UChar* buffer */
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static void
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ucbuf_closebuf(UCHARBUF* buf){
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uprv_free(buf->buffer);
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buf->buffer = NULL;
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}
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/* close the buf and release resources*/
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U_CAPI void U_EXPORT2
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ucbuf_close(UCHARBUF* buf){
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if(buf->conv){
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ucnv_close(buf->conv);
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}
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buf->in=NULL;
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buf->currentPos=NULL;
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buf->bufLimit=NULL;
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ucbuf_closebuf(buf);
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uprv_free(buf);
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}
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/* rewind the buf and file stream */
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U_CAPI void U_EXPORT2
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ucbuf_rewind(UCHARBUF* buf){
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if(buf){
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const char* cp="";
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buf->currentPos=buf->buffer;
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buf->bufLimit=buf->buffer;
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ucnv_reset(buf->conv);
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T_FileStream_rewind(buf->in);
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ucbuf_autodetect(buf->in,&cp);
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buf->remaining=T_FileStream_size(buf->in);
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}
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}
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