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Bunch of updates, progressive parsing, updates on HTML, XPAth and docs, Daniel
This commit is contained in:
Daniel Veillard
321
xmlIO.c
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321
xmlIO.c
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/*
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* xmlIO.c : implementation of the I/O interfaces used by the parser
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*
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* See Copyright for the status of this software.
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*
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* Daniel.Veillard@w3.org
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*/
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#include "config.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <malloc.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_ZLIB_H
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#include <zlib.h>
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#endif
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#include "xmlIO.h"
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/* #define DEBUG_INPUT */
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/* #define VERBOSE_FAILURE */
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#ifdef DEBUG_INPUT
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#define MINLEN 40
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#else
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#define MINLEN 4000
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#endif
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/**
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* xmlAllocParserInputBuffer:
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* @enc: the charset encoding if known
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*
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* Create a buffered parser input for progressive parsing
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*
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* Returns the new parser input or NULL
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*/
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xmlParserInputBufferPtr
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xmlAllocParserInputBuffer(xmlCharEncoding enc) {
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xmlParserInputBufferPtr ret;
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ret = (xmlParserInputBufferPtr) malloc(sizeof(xmlParserInputBuffer));
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if (ret == NULL) {
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fprintf(stderr, "xmlAllocParserInputBuffer : out of memory!\n");
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return(NULL);
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}
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memset(ret, 0, (size_t) sizeof(xmlParserInputBuffer));
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ret->buffer = xmlBufferCreate();
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ret->encoder = xmlGetCharEncodingHandler(enc);
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ret->fd = -1;
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return(ret);
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}
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/**
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* xmlFreeParserInputBuffer:
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* @in: a buffered parser input
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*
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* Free up the memory used by a buffered parser input
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*/
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void
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xmlFreeParserInputBuffer(xmlParserInputBufferPtr in) {
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if (in->buffer != NULL) {
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xmlBufferFree(in->buffer);
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in->buffer = NULL;
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}
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#ifdef HAVE_ZLIB_H
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if (in->gzfile != NULL)
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gzclose(in->gzfile);
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#endif
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if (in->fd >= 0)
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close(in->fd);
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memset(in, 0xbe, (size_t) sizeof(xmlParserInputBuffer));
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free(in);
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}
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/**
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* xmlParserInputBufferCreateFilename:
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* @filename: a C string containing the filename
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* @enc: the charset encoding if known
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*
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* Create a buffered parser input for the progressive parsing of a file
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* If filename is "-' then we use stdin as the input.
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* Automatic support for ZLIB/Compress compressed document is provided
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* by default if found at compile-time.
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*
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* Returns the new parser input or NULL
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*/
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xmlParserInputBufferPtr
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xmlParserInputBufferCreateFilename(const char *filename, xmlCharEncoding enc) {
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xmlParserInputBufferPtr ret;
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#ifdef HAVE_ZLIB_H
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gzFile input;
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#else
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int input = -1;
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#endif
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if (filename == NULL) return(NULL);
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if (!strcmp(filename, "-")) {
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#ifdef HAVE_ZLIB_H
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input = gzdopen (fileno(stdin), "r");
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if (input == NULL) {
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#ifdef VERBOSE_FAILURE
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fprintf (stderr, "Cannot read from stdin\n");
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perror ("gzdopen failed");
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#endif
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return(NULL);
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}
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#else
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#ifdef WIN32
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input = -1;
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#else
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input = fileno(stdin);
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#endif
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if (input < 0) {
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#ifdef VERBOSE_FAILURE
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fprintf (stderr, "Cannot read from stdin\n");
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perror ("open failed");
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#endif
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return(NULL);
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}
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#endif
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} else {
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#ifdef HAVE_ZLIB_H
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input = gzopen (filename, "r");
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if (input == NULL) {
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#ifdef VERBOSE_FAILURE
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fprintf (stderr, "Cannot read file %s :\n", filename);
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perror ("gzopen failed");
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#endif
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return(NULL);
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}
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#else
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#ifdef WIN32
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input = _open (filename, O_RDONLY | _O_BINARY);
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#else
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input = open (filename, O_RDONLY);
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#endif
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if (input < 0) {
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#ifdef VERBOSE_FAILURE
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fprintf (stderr, "Cannot read file %s :\n", filename);
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perror ("open failed");
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#endif
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return(NULL);
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}
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#endif
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}
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/*
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* TODO : get the 4 first bytes and
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* if enc == XML_CHAR_ENCODING_NONE
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* plug some encoding conversion routines here. !!!
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* enc = xmlDetectCharEncoding(buffer);
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*/
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ret = xmlAllocParserInputBuffer(enc);
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if (ret != NULL) {
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#ifdef HAVE_ZLIB_H
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ret->gzfile = input;
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#else
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ret->fd = input;
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#endif
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}
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xmlParserInputBufferRead(ret, 4);
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return(ret);
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}
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/**
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* xmlParserInputBufferCreateFile:
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* @file: a FILE*
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* @enc: the charset encoding if known
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*
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* Create a buffered parser input for the progressive parsing of a FILE *
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* buffered C I/O
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*
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* Returns the new parser input or NULL
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*/
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xmlParserInputBufferPtr
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xmlParserInputBufferCreateFile(FILE *file, xmlCharEncoding enc) {
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xmlParserInputBufferPtr ret;
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if (file == NULL) return(NULL);
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ret = xmlAllocParserInputBuffer(enc);
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if (ret != NULL)
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ret->file = file;
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return(ret);
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}
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/**
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* xmlParserInputBufferCreateFd:
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* @fd: a file descriptor number
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* @enc: the charset encoding if known
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*
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* Create a buffered parser input for the progressive parsing for the input
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* from a file descriptor
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*
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* Returns the new parser input or NULL
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*/
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xmlParserInputBufferPtr
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xmlParserInputBufferCreateFd(int fd, xmlCharEncoding enc) {
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xmlParserInputBufferPtr ret;
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if (fd < 0) return(NULL);
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ret = xmlAllocParserInputBuffer(enc);
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if (ret != NULL)
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ret->fd = fd;
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return(ret);
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}
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/**
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* xmlParserInputBufferGrow:
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* @in: a buffered parser input
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* @len: indicative value of the amount of chars to read
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*
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* Grow up the content of the input buffer, the old data are preserved
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* This routine handle the I18N transcoding to internal UTF-8
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* TODO: one should be able to remove one copy
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*
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* Returns the number of chars read and stored in the buffer, or -1
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* in case of error.
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*/
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int
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xmlParserInputBufferGrow(xmlParserInputBufferPtr in, int len) {
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char *buffer = NULL;
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#ifdef HAVE_ZLIB_H
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gzFile input = (gzFile) in->gzfile;
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#endif
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int res = 0;
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int nbchars = 0;
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int buffree;
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if ((len <= MINLEN) && (len != 4))
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len = MINLEN;
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buffree = in->buffer->size - in->buffer->use;
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if (buffree <= 0) {
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fprintf(stderr, "xmlParserInputBufferGrow : buffer full !\n");
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return(0);
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}
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if (len > buffree)
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len = buffree;
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buffer = malloc((len + 1) * sizeof(char));
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if (buffer == NULL) {
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fprintf(stderr, "xmlParserInputBufferGrow : out of memory !\n");
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return(-1);
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}
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if (in->file != NULL) {
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res = fread(&buffer[0], 1, len, in->file);
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#ifdef HAVE_ZLIB_H
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} else if (in->gzfile != NULL) {
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res = gzread(input, &buffer[0], len);
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#endif
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} else if (in->fd >= 0) {
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res = read(in->fd, &buffer[0], len);
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} else {
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fprintf(stderr, "xmlParserInputBufferGrow : no input !\n");
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free(buffer);
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return(-1);
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}
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if (res == 0) {
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free(buffer);
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return(0);
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}
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if (res < 0) {
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perror ("read error");
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free(buffer);
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return(-1);
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}
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if (in->encoder != NULL) {
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CHAR *buf;
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buf = (CHAR *) malloc((res + 1) * 2 * sizeof(CHAR));
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if (buf == NULL) {
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fprintf(stderr, "xmlParserInputBufferGrow : out of memory !\n");
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free(buffer);
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return(-1);
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}
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nbchars = in->encoder->input(buf, (res + 1) * 2 * sizeof(CHAR),
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buffer, res);
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buf[nbchars] = 0;
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xmlBufferAdd(in->buffer, (CHAR *) buf, nbchars);
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free(buf);
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} else {
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nbchars = res;
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buffer[nbchars] = 0;
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xmlBufferAdd(in->buffer, (CHAR *) buffer, nbchars);
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}
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#ifdef DEBUG_INPUT
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fprintf(stderr, "I/O: read %d chars, buffer %d/%d\n",
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nbchars, in->buffer->use, in->buffer->size);
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#endif
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free(buffer);
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return(nbchars);
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}
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/**
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* xmlParserInputBufferRead:
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* @in: a buffered parser input
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* @len: indicative value of the amount of chars to read
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*
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* Refresh the content of the input buffer, the old data are considered
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* consumed
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* This routine handle the I18N transcoding to internal UTF-8
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*
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* Returns the number of chars read and stored in the buffer, or -1
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* in case of error.
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*/
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int
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xmlParserInputBufferRead(xmlParserInputBufferPtr in, int len) {
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/* xmlBufferEmpty(in->buffer); */
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return(xmlParserInputBufferGrow(in, len));
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}
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