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boinc/lib/parse.cpp

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// This file is part of BOINC.
// http://boinc.berkeley.edu
// Copyright (C) 2008 University of California
//
// BOINC is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// BOINC is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with BOINC. If not, see <http://www.gnu.org/licenses/>.
// A very crude interface for parsing XML files;
// assumes all elements are either single-line or
// have start and end tags on separate lines.
// This is meant to be used ONLY for parsing XML files produced
// by the BOINC scheduling server or client.
// Could replace this with a more general parser.
#if defined(_WIN32) && !defined(__STDWX_H__)
#include "boinc_win.h"
#elif defined(_WIN32) && defined(__STDWX_H__)
#include "stdwx.h"
#else
#include "config.h"
#include <cstring>
#include <cstdlib>
#include <string>
#include <math.h>
#include <ctype.h>
#include <errno.h>
#if HAVE_IEEEFP_H
#include <ieeefp.h>
#endif
#endif
#ifdef _MSC_VER
#define strdup _strdup
#endif
#ifdef _USING_FCGI_
#include "boinc_fcgi.h"
#endif
#include "error_numbers.h"
#include "str_util.h"
#include "str_replace.h"
#include "parse.h"
using std::string;
// Parse a boolean; tag is of form "foobar"
// Accept either <foobar/>, <foobar />, or <foobar>0|1</foobar>
// (possibly with leading/trailing white space)
//
bool parse_bool(const char* buf, const char* tag, bool& result) {
char tag2[256], tag3[256];
int x;
// quick check to reject most cases
//
if (!strstr(buf, tag)) {
return false;
}
sprintf(tag2, "<%s/>", tag);
sprintf(tag3, "<%s />", tag);
if (match_tag(buf, tag2) || match_tag(buf, tag3)) {
result = true;
return true;
}
sprintf(tag2, "<%s>", tag);
if (parse_int(buf, tag2, x)) {
result = (x != 0);
return true;
}
return false;
}
// parse a string of the form ...<tag attrs>string</tag>...;
// returns the "string" part.
// Does XML unescaping (replace &lt; with <)
// "string" may not include '<'
// Strips white space from ends.
// Use "<tag", not "<tag>", if there might be attributes
//
bool parse_str(const char* buf, const char* tag, char* dest, int destlen) {
string str;
const char* p;
int len;
p = strstr(buf, tag);
if (!p) return false;
p = strchr(p, '>');
p++;
const char* q = strchr(p, '<');
if (!q) return false;
len = (int)(q-p);
if (len >= destlen) len = destlen-1;
memcpy(dest, p, len);
dest[len] = 0;
strip_whitespace(dest);
xml_unescape(dest);
return true;
}
bool parse_str(const char* buf, const char* tag, string& dest) {
char tempbuf[1024];
if (!parse_str(buf, tag, tempbuf, 1024)) return false;
dest = tempbuf;
return true;
}
// parse a string of the form 'xxx name="value" xxx';
// returns value in dest
//
void parse_attr(const char* buf, const char* name, char* dest, int len) {
const char* p;
const char *q;
strcpy(dest, "");
p = strstr(buf, name);
if (!p) return;
p = strchr(p, '"');
if (!p) return;
q = strchr(p+1, '"');
if (!q) return;
if (len > q-p) len = (int)(q-p);
strlcpy(dest, p+1, len);
}
int copy_stream(FILE* in, FILE* out) {
char buf[1024];
int n, m;
while (1) {
n = (int)fread(buf, 1, 1024, in);
m = (int)fwrite(buf, 1, n, out);
if (m != n) return ERR_FWRITE;
if (n < 1024) break;
}
return 0;
}
// append to a malloc'd string
//
int strcatdup(char*& p, char* buf) {
p = (char*)realloc(p, strlen(p) + strlen(buf)+1);
if (!p) {
return ERR_MALLOC;
}
strcat(p, buf);
return 0;
}
// Copy from a file to a malloc'd string until the end tag is reached
// Does NOT copy the start and end tags.
//
int dup_element_contents(FILE* in, const char* end_tag, char** pp) {
char line[256];
int bufsize = 4000000;
int nused=0; // not counting ending NULL
char* buf = (char*)malloc(bufsize);
// Start with a big buffer.
// When done, copy to an exact-size buffer
//
while (fgets(line, 256, in)) {
if (strstr(line, end_tag)) {
*pp = (char*)malloc(nused+1);
strcpy(*pp, buf);
free(buf);
return 0;
}
int n = (int)strlen(line);
if (nused + n >= bufsize) {
bufsize *= 2;
buf = (char*)realloc(buf, bufsize);
}
strcpy(buf+nused, line);
nused += n;
}
free(buf);
return ERR_XML_PARSE;
}
int dup_element(FILE* in, const char* tag_name, char** pp) {
char buf[256], end_tag[256];
int retval;
sprintf(buf, "<%s>\n", tag_name);
sprintf(end_tag, "</%s>", tag_name);
char* p = strdup(buf);
while (fgets(buf, 256, in)) {
if (strstr(buf, end_tag)) {
sprintf(buf, "</%s>\n", tag_name);
retval = strcatdup(p, buf);
if (retval) return retval;
*pp = p;
return 0;
}
retval = strcatdup(p, buf);
if (retval) return retval;
}
return ERR_XML_PARSE;
}
// copy from a file to static buffer
//
int copy_element_contents(FILE* in, const char* end_tag, char* p, int len) {
char buf[256];
int n;
strcpy(p, "");
while (fgets(buf, 256, in)) {
if (strstr(buf, end_tag)) {
return 0;
}
n = (int)strlen(buf);
if (n >= len-1) return ERR_XML_PARSE;
strcat(p, buf);
len -= n;
}
return ERR_XML_PARSE;
}
int copy_element_contents(FILE* in, const char* end_tag, string& str) {
int c;
size_t end_tag_len = strlen(end_tag);
size_t n = 0;
str = "";
while (1) {
c = fgetc(in);
if (c == EOF) break;
if (n >= end_tag_len) {
const char* p = str.c_str() + n - end_tag_len;
if (!strcmp(p, end_tag)) {
str.erase(n-end_tag_len, end_tag_len);
return 0;
}
}
str += c;
n++;
}
return ERR_XML_PARSE;
}
// replace XML element contents (element must be present)
//
void replace_element_contents(
char* buf, const char* start, const char* end, const char* replacement
) {
char temp[4096], *p, *q;
p = strstr(buf, start);
p += strlen(start);
q = strstr(p, end);
strlcpy(temp, q, sizeof(temp));
strcpy(p, replacement);
strcat(p, temp);
}
// if the string contains a substring of the form X...Y,
// remove the first such.
bool remove_element(char* buf, const char* start, const char* end) {
char* p, *q;
p = strstr(buf, start);
if (!p) return false;
q = strstr(p+strlen(start), end);
if (!q) return false;
strcpy_overlap(p, q+strlen(end));
return true;
}
// replace a substring. Do at most one instance.
//
bool str_replace(char* str, const char* substr, const char* replacement) {
char temp[4096], *p;
p = strstr(str, substr);
if (!p) return false;
int n = (int)strlen(substr);
strcpy(temp, p+n);
strcpy(p, replacement);
strcat(p, temp);
return true;
}
// if the given XML has an element of the form
// <venue name="venue_name">
// ...
// </venue>
// then return the contents of that element.
// Otherwise strip out all <venue> elements
//
void extract_venue(const char* in, const char* venue_name, char* out) {
const char* p, *q;
char* wp;
char buf[256];
sprintf(buf, "<venue name=\"%s\">", venue_name);
p = strstr(in, buf);
if (p) {
// prefs contain the specified venue
//
p += strlen(buf);
strcpy(out, p);
wp = strstr(out, "</venue");
if (wp) *wp = 0;
} else {
// prefs don't contain the specified venue
//
q = in;
strcpy(out, "");
while (1) {
p = strstr(q, "<venue");
if (!p) {
strcat(out, q);
break;
}
strncat(out, q, p-q);
q = strstr(p, "</venue>");
if (!q) break;
q += strlen("</venue>");
}
}
}
// copy a line from the given string.
// kinda like fgets() when you're reading from a string
//
char* sgets(char* buf, int len, char*& in) {
char* p;
p = strstr(in, "\n");
if (!p) return NULL;
*p = 0;
strlcpy(buf, in, len);
*p = '\n';
in = p+1;
return buf;
}
void non_ascii_escape(const char* in, char* out, int len) {
char buf[256], *p;
p = out;
for (; *in; in++) {
int x = (int) *in;
x &= 0xff; // just in case
if (x>127) {
sprintf(buf, "&#%d;", x);
strcpy(p, buf);
p += strlen(buf);
} else {
*p++ = x;
}
if (p > out + len - 8) break;
}
*p = 0;
}
// NOTE: these used to take std::string instead of char* args.
// But this performed poorly.
//
// NOTE: output buffer should be 6X size of input
//
void xml_escape(const char* in, char* out, int len) {
char buf[256], *p;
p = out;
for (; *in; in++) {
int x = (int) *in;
x &= 0xff; // just in case
if (x == '<') {
strcpy(p, "&lt;");
p += 4;
} else if (x == '&') {
strcpy(p, "&amp;");
p += 5;
} else if (x>127) {
sprintf(buf, "&#%d;", x);
strcpy(p, buf);
p += strlen(buf);
} else if (x<32) {
switch(x) {
case 9:
case 10:
case 13:
sprintf(buf, "&#%d;", x);
strcpy(p, buf);
p += strlen(buf);
break;
}
} else {
*p++ = x;
}
if (p > out + len - 8) break;
}
*p = 0;
}
// Note: XML unescaping never increases string length
//
void xml_unescape(string& in) {
int n = (int)in.size()+1+16; // +16 avoids valgrind warnings
char* buf = (char*)malloc(n);
strcpy(buf, in.c_str());
xml_unescape(buf);
in = buf;
free(buf);
}
void xml_unescape(char* buf) {
char* out = buf;
char* in = buf;
char* p;
while (*in) {
if (*in != '&') { // avoid strncmp's if possible
*out++ = *in++;
} else if (!strncmp(in, "&lt;", 4)) {
*out++ = '<';
in += 4;
} else if (!strncmp(in, "&gt;", 4)) {
*out++ = '>';
in += 4;
} else if (!strncmp(in, "&quot;", 4)) {
*out++ = '"';
in += 6;
} else if (!strncmp(in, "&apos;", 4)) {
*out++ = '\'';
in += 6;
} else if (!strncmp(in, "&amp;", 5)) {
*out++ = '&';
in += 5;
} else if (!strncmp(in, "&#", 2)) {
in += 2;
char c = atoi(in);
*out++ = c;
p = strchr(in, ';');
if (p) {
in = p+1;
} else {
while (isdigit(*in)) in++;
}
} else {
*out++ = *in++;
}
}
*out = 0;
}
// we got an unrecognized line.
// If it has two <'s (e.g. <foo>xx</foo>) return 0.
// If it's of the form <foo/> return 0.
// If it's of the form <foo> then scan for </foo> and return 0.
// Otherwise return ERR_XML_PARSE
//
int skip_unrecognized(char* buf, MIOFILE& fin) {
char* p, *q, buf2[256];
std::string close_tag;
p = strchr(buf, '<');
if (!p) {
return ERR_XML_PARSE;
}
if (strchr(p+1, '<')) {
return 0;
}
q = strchr(p+1, '>');
if (!q) {
return ERR_XML_PARSE;
}
if (q[-1] == '/') return 0;
*q = 0;
close_tag = string("</") + string(p+1) + string(">");
while (fin.fgets(buf2, 256)) {
if (strstr(buf2, close_tag.c_str())) {
return 0;
}
}
return ERR_XML_PARSE;
}
XML_PARSER::XML_PARSER(MIOFILE* _f) {
f = _f;
}
int XML_PARSER::scan_comment() {
char buf[256];
char* p = buf;
while (1) {
int c = f->_getc();
if (!c || c == EOF) return XML_PARSE_EOF;
*p++ = c;
*p = 0;
if (strstr(buf, "-->")) {
return XML_PARSE_COMMENT;
}
if (strlen(buf) > 32) {
strcpy_overlap(buf, buf+16);
p -= 16;
}
}
}
int XML_PARSER::scan_cdata(char* buf, int len) {
char* p = buf;
len--;
while (1) {
int c = f->_getc();
if (!c || c == EOF) return XML_PARSE_EOF;
if (len) {
*p++ = c;
len--;
}
if (c == '>') {
*p = 0;
char* q = strstr(buf, "]]>");
if (q) {
*q = 0;
return XML_PARSE_CDATA;
}
}
}
}
#define MAX_XML_STRING 262144
// We just parsed "parsed_tag".
// If it matches "start_tag", and is followed by a string
// and by the matching close tag, return the string in "buf",
// and return true.
//
bool XML_PARSER::parse_str(const char* start_tag, char* buf, int len) {
bool eof;
char end_tag[TAG_BUF_LEN], tag[TAG_BUF_LEN];
size_t n = strlen(parsed_tag);
// handle the archaic form <tag/>, which means empty string
//
if (parsed_tag[n-1] == '/') {
strcpy(tag, parsed_tag);
tag[n-1] = 0;
if (!strcmp(tag, start_tag)) {
strcpy(buf, "");
return true;
}
}
// check for start tag
//
if (strcmp(parsed_tag, start_tag)) return false;
end_tag[0] = '/';
strcpy(end_tag+1, start_tag);
// get text after start tag
//
int retval = get_aux(buf, len, 0, 0);
if (retval == XML_PARSE_EOF) return false;
// if it's the end tag, return empty string
//
if (retval == XML_PARSE_TAG) {
if (strcmp(buf, end_tag)) {
return false;
} else {
strcpy(buf, "");
return true;
}
}
eof = get(tag, sizeof(tag), is_tag);
if (eof) return false;
if (!is_tag) return false;
if (strcmp(tag, end_tag)) return false;
if (retval != XML_PARSE_CDATA) {
xml_unescape(buf);
}
return true;
}
bool XML_PARSER::parse_string(const char* start_tag, string& str) {
char buf[MAX_XML_STRING];
bool flag = parse_str(start_tag, buf, sizeof(buf));
if (!flag) return false;
str = buf;
return true;
}
// Same, for integers
//
bool XML_PARSER::parse_int(const char* start_tag, int& i) {
char buf[256], *end;
bool eof;
char end_tag[TAG_BUF_LEN], tag[TAG_BUF_LEN];
if (strcmp(parsed_tag, start_tag)) return false;
end_tag[0] = '/';
strcpy(end_tag+1, start_tag);
eof = get(buf, sizeof(buf), is_tag);
if (eof) return false;
if (is_tag) {
if (!strcmp(buf, end_tag)) {
i = 0; // treat <foo></foo> as <foo>0</foo>
return true;
} else {
return false;
}
}
errno = 0;
int val = strtol(buf, &end, 0);
if (errno) return false;
if (end != buf+strlen(buf)) return false;
eof = get(tag, sizeof(tag), is_tag);
if (eof) return false;
if (!is_tag) return false;
if (strcmp(tag, end_tag)) return false;
i = val;
return true;
}
// Same, for doubles
//
bool XML_PARSER::parse_double(const char* start_tag, double& x) {
char buf[256], *end;
bool eof;
char end_tag[TAG_BUF_LEN], tag[TAG_BUF_LEN];
if (strcmp(parsed_tag, start_tag)) return false;
end_tag[0] = '/';
strcpy(end_tag+1, start_tag);
eof = get(buf, sizeof(buf), is_tag);
if (eof) return false;
if (is_tag) {
if (!strcmp(buf, end_tag)) {
x = 0; // treat <foo></foo> as <foo>0</foo>
return true;
} else {
return false;
}
}
errno = 0;
double val = strtod(buf, &end);
if (errno) return false;
if (end != buf+strlen(buf)) return false;
eof = get(tag, sizeof(tag), is_tag);
if (eof) return false;
if (!is_tag) return false;
if (strcmp(tag, end_tag)) return false;
x = val;
return true;
}
// Same, for unsigned long
//
bool XML_PARSER::parse_ulong(const char* start_tag, unsigned long& x) {
char buf[256], *end;
bool eof;
char end_tag[TAG_BUF_LEN], tag[TAG_BUF_LEN];
if (strcmp(parsed_tag, start_tag)) return false;
end_tag[0] = '/';
strcpy(end_tag+1, start_tag);
eof = get(buf, sizeof(buf), is_tag);
if (eof) return false;
if (is_tag) {
if (!strcmp(buf, end_tag)) {
x = 0; // treat <foo></foo> as <foo>0</foo>
return true;
} else {
return false;
}
}
errno = 0;
unsigned long val = strtoul(buf, &end, 0);
if (errno) return false;
if (end != buf+strlen(buf)) return false;
eof = get(tag, sizeof(tag), is_tag);
if (eof) return false;
if (!is_tag) return false;
if (strcmp(tag, end_tag)) return false;
x = val;
return true;
}
// Same, for unsigned long long
//
bool XML_PARSER::parse_ulonglong(const char* start_tag, unsigned long long& x) {
char buf[256], *end=0;
bool eof;
char end_tag[TAG_BUF_LEN], tag[TAG_BUF_LEN];
if (strcmp(parsed_tag, start_tag)) return false;
end_tag[0] = '/';
strcpy(end_tag+1, start_tag);
eof = get(buf, sizeof(buf), is_tag);
if (eof) return false;
if (is_tag) {
if (!strcmp(buf, end_tag)) {
x = 0; // treat <foo></foo> as <foo>0</foo>
return true;
} else {
return false;
}
}
errno = 0;
unsigned long long val = boinc_strtoull(buf, &end, 0);
if (errno) return false;
if (end != buf+strlen(buf)) return false;
eof = get(tag, sizeof(tag), is_tag);
if (eof) return false;
if (!is_tag) return false;
if (strcmp(tag, end_tag)) return false;
x = val;
return true;
}
// Same, for bools
//
bool XML_PARSER::parse_bool(const char* start_tag, bool& b) {
char buf[256], *end;
bool eof;
char end_tag[TAG_BUF_LEN], tag[TAG_BUF_LEN];
// handle the archaic form <tag/>, which means true
//
strcpy(tag, start_tag);
strcat(tag, "/");
if (!strcmp(parsed_tag, tag)) {
b = true;
return true;
}
// otherwise look for something of the form <tag>int</tag>
//
if (strcmp(parsed_tag, start_tag)) return false;
eof = get(buf, sizeof(buf), is_tag);
if (eof) return false;
if (is_tag) return false;
bool val = (strtol(buf, &end, 0) != 0);
if (end != buf+strlen(buf)) return false;
end_tag[0] = '/';
strcpy(end_tag+1, start_tag);
eof = get(tag, sizeof(tag), is_tag);
if (eof) return false;
if (!is_tag) return false;
if (strcmp(tag, end_tag)) return false;
b = val;
return true;
}
// parse a start tag (optionally preceded by <?xml>)
//
bool XML_PARSER::parse_start(const char* start_tag) {
char tag[TAG_BUF_LEN];
bool eof;
eof = get(tag, sizeof(tag), is_tag);
if (eof || !is_tag ) {
return false;
}
if (strstr(tag, "?xml")) {
eof = get(tag, sizeof(tag), is_tag);
if (eof || !is_tag ) {
return false;
}
}
if (strcmp(tag, start_tag)) {
return false;
}
return true;
}
// We got an unexpected tag.
// If it's an end tag, do nothing.
// Otherwise skip until the end tag, if any
//
void XML_PARSER::skip_unexpected(
const char* start_tag, bool verbose, const char* where
) {
char buf[TAG_BUF_LEN], end_tag[TAG_BUF_LEN];
if (verbose) {
fprintf(stderr,
"Unrecognized XML tag '<%s>' in %s; skipping\n",
start_tag, where
);
}
if (strchr(start_tag, '/')) return;
sprintf(end_tag, "/%s", start_tag);
while (1) {
int c;
bool eof = scan_nonws(c);
if (eof) return;
if (c == '<') {
int retval = scan_tag(buf, sizeof(buf), 0, 0);
if (retval != XML_PARSE_TAG) continue;
if (!strcmp(buf, end_tag)) return;
skip_unexpected(buf, false, where);
}
}
}
// we just parsed a tag.
// copy this entire element, including start and end tags, to the buffer
//
int XML_PARSER::copy_element(string& out) {
char end_tag[TAG_BUF_LEN], buf[1024];
// handle <foo/> case
//
size_t n = strlen(parsed_tag);
if (parsed_tag[n-1] == '/') {
out = "<";
out += parsed_tag;
out += ">";
return 0;
}
if (strchr(parsed_tag, '/')) return ERR_XML_PARSE;
out = "<";
out += parsed_tag;
out += ">";
sprintf(end_tag, "</%s>", parsed_tag);
int retval = element_contents(end_tag, buf, sizeof(buf));
if (retval) return retval;
out += buf;
out += end_tag;
return 0;
}
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