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Diffstat (limited to 'src/xml_C14N.c')
| -rw-r--r-- | src/xml_C14N.c | 359 |
1 files changed, 359 insertions, 0 deletions
diff --git a/src/xml_C14N.c b/src/xml_C14N.c new file mode 100644 index 0000000..4a0becc --- /dev/null +++ b/src/xml_C14N.c @@ -0,0 +1,359 @@ +/* + * $Id: xml_C14N.c,v 1.12 2004/11/24 03:00:10 mgrouch Exp $ + * + * Canonical XML implementation test program + * (http://www.w3.org/TR/2001/REC-xml-c14n-20010315) + * + * See Copyright for the status of this software. + * + * Author: Aleksey Sanin <aleksey@aleksey.com> + */ + +#include <libxml/xmlversion.h> +#include <config.h> + +#if defined(LIBXML_C14N_ENABLED) + +#include <stdio.h> +#include <string.h> +#ifdef HAVE_STDLIB_H +#include <stdlib.h> +#endif + +#include <libxml/xmlmemory.h> +#include <libxml/parser.h> +#include <libxml/xpath.h> +#include <libxml/xpathInternals.h> + +#include <libxml/c14n.h> + +#include "xmlstar.h" + +static void c14nUsage(const char *name, exit_status status) +{ + extern void fprint_c14n_usage(FILE* o, const char* argv0); + extern const char more_info[]; + FILE *o = (status == EXIT_SUCCESS)? stdout : stderr; + fprint_c14n_usage(o, name); + fprintf(o, "%s", more_info); + exit(status); +} + +static xmlXPathObjectPtr +load_xpath_expr (xmlDocPtr parent_doc, const char* filename); + +static xmlChar **parse_list(xmlChar *str); + +#if 0 +static void print_xpath_nodes(xmlNodeSetPtr nodes); +#endif + +static int +run_c14n(const char* xml_filename, int with_comments, int exclusive, + const char* xpath_filename, xmlChar **inclusive_namespaces, + int nonet) { + xmlDocPtr doc; + xmlXPathObjectPtr xpath = NULL; + int ret; + + /* + * build an XML tree from a the file; we need to add default + * attributes and resolve all character and entities references + */ + + doc = xmlReadFile(xml_filename, NULL, + XML_PARSE_NOENT | XML_PARSE_DTDLOAD | + XML_PARSE_DTDATTR | (nonet? XML_PARSE_NONET:0)); + if (doc == NULL) { + fprintf(stderr, "Error: unable to parse file \"%s\"\n", xml_filename); + return(EXIT_BAD_FILE); + } + + /* + * Check the document is of the right kind + */ + if(xmlDocGetRootElement(doc) == NULL) { + fprintf(stderr,"Error: empty document for file \"%s\"\n", xml_filename); + xmlFreeDoc(doc); + return(EXIT_BAD_FILE); + } + + /* + * load xpath file if specified + */ + if(xpath_filename) { + xpath = load_xpath_expr(doc, xpath_filename); + if(xpath == NULL) { + fprintf(stderr,"Error: unable to evaluate xpath expression\n"); + xmlFreeDoc(doc); + return(EXIT_BAD_FILE); + } + } + + /* + * Canonical form + */ + set_stdout_binary(); /* avoid line ending conversion */ + ret = xmlC14NDocSave(doc, + (xpath) ? xpath->nodesetval : NULL, + exclusive, inclusive_namespaces, + with_comments, "-", 0); + if(ret < 0) { + fprintf(stderr,"Error: failed to canonicalize XML file \"%s\" (ret=%d)\n", + xml_filename, ret); + xmlFreeDoc(doc); + return(EXIT_FAILURE); + } + + /* + * Cleanup + */ + if(xpath != NULL) xmlXPathFreeObject(xpath); + xmlFreeDoc(doc); + + return(ret >= 0? EXIT_SUCCESS : EXIT_FAILURE); +} + +int c14nMain(int argc, char **argv) { + int ret = -1, nonet = 1; + + /* + * Init libxml + */ + xmlInitParser(); + LIBXML_TEST_VERSION + + /* + * Parse command line and process file + */ + + if (argc > 2 && strcmp(argv[2], "--net") == 0) { + nonet = 0; + /* TODO: parse options properly */ + argc--; + argv++; + } + + if (argc < 4) { + if (argc >= 3) + { + if (strcmp(argv[2], "--help") == 0 || strcmp(argv[2], "-h") == 0) + c14nUsage(argv[0], EXIT_SUCCESS); + } + ret = run_c14n((argc > 2)? argv[2] : "-", 1, 0, NULL, NULL, nonet); + } else if(strcmp(argv[2], "--with-comments") == 0) { + ret = run_c14n(argv[3], 1, 0, (argc > 4) ? argv[4] : NULL, NULL, nonet); + } else if(strcmp(argv[2], "--without-comments") == 0) { + ret = run_c14n(argv[3], 0, 0, (argc > 4) ? argv[4] : NULL, NULL, nonet); + } else if(strcmp(argv[2], "--exc-with-comments") == 0) { + xmlChar **list; + + /* load exclusive namespace from command line */ + list = (argc > 5) ? parse_list((xmlChar *)argv[5]) : NULL; + ret = run_c14n(argv[3], 1, 1, (argc > 4) ? argv[4] : NULL, list, nonet); + if(list != NULL) xmlFree(list); + } else if(strcmp(argv[2], "--exc-without-comments") == 0) { + xmlChar **list; + + /* load exclusive namespace from command line */ + list = (argc > 5) ? parse_list((xmlChar *)argv[5]) : NULL; + ret = run_c14n(argv[3], 0, 1, (argc > 4) ? argv[4] : NULL, list, nonet); + if(list != NULL) xmlFree(list); + } else { + fprintf(stderr, "error: bad arguments.\n"); + c14nUsage(argv[0], EXIT_BAD_ARGS); + } + + /* + * Shutdown libxml + */ + xmlCleanupParser(); + xmlMemoryDump(); + + return ret; +} + +/* + * Macro used to grow the current buffer. + */ +#define growBufferReentrant() { \ + buffer_size *= 2; \ + buffer = (xmlChar **) \ + xmlRealloc(buffer, buffer_size * sizeof(xmlChar*)); \ + if (buffer == NULL) { \ + perror("realloc failed"); \ + return(NULL); \ + } \ +} + +static xmlChar ** +parse_list(xmlChar *str) { + xmlChar **buffer; + xmlChar **out = NULL; + int buffer_size = 0; + int len; + + if(str == NULL) { + return(NULL); + } + + len = xmlStrlen(str); + if((str[0] == '\'') && (str[len - 1] == '\'')) { + str[len - 1] = '\0'; + str++; + len -= 2; + } + /* + * allocate an translation buffer. + */ + buffer_size = 1000; + buffer = xmlMalloc(buffer_size * sizeof(xmlChar*)); + out = buffer; + + while(*str != '\0') { + if (out - buffer > buffer_size - 10) { + int indx = out - buffer; + + growBufferReentrant(); + out = &buffer[indx]; + } + (*out++) = str; + while(*str != ',' && *str != '\0') ++str; + if(*str == ',') *(str++) = '\0'; + } + (*out) = NULL; + return buffer; +} + +static xmlXPathObjectPtr +load_xpath_expr (xmlDocPtr parent_doc, const char* filename) { + xmlXPathObjectPtr xpath; + xmlDocPtr doc; + xmlChar *expr; + xmlXPathContextPtr ctx; + xmlNodePtr node; + xmlNsPtr ns; + + /* + * load XPath expr as a file + */ + xmlLoadExtDtdDefaultValue = XML_DETECT_IDS | XML_COMPLETE_ATTRS; + xmlSubstituteEntitiesDefault(1); + + doc = xmlReadFile(filename, NULL, XML_PARSE_DTDLOAD | XML_PARSE_DTDATTR); + if (doc == NULL) { + fprintf(stderr, "Error: unable to parse file \"%s\"\n", filename); + return(NULL); + } + + /* + * Check the document is of the right kind + */ + if(xmlDocGetRootElement(doc) == NULL) { + fprintf(stderr,"Error: empty document for file \"%s\"\n", filename); + xmlFreeDoc(doc); + return(NULL); + } + + node = doc->children; + while(node != NULL && !xmlStrEqual(node->name, (const xmlChar *)"XPath")) { + node = node->next; + } + + if(node == NULL) { + fprintf(stderr,"Error: XPath element expected in the file \"%s\"\n", filename); + xmlFreeDoc(doc); + return(NULL); + } + + expr = xmlNodeGetContent(node); + if(expr == NULL) { + fprintf(stderr,"Error: XPath content element is NULL \"%s\"\n", filename); + xmlFreeDoc(doc); + return(NULL); + } + + ctx = xmlXPathNewContext(parent_doc); + if(ctx == NULL) { + fprintf(stderr,"Error: unable to create new context\n"); + xmlFree(expr); + xmlFreeDoc(doc); + return(NULL); + } + + /* + * Register namespaces + */ + ns = node->nsDef; + while(ns != NULL) { + if(xmlXPathRegisterNs(ctx, ns->prefix, ns->href) != 0) { + fprintf(stderr,"Error: unable to register NS with prefix=\"%s\" and href=\"%s\"\n", ns->prefix, ns->href); + xmlFree(expr); + xmlXPathFreeContext(ctx); + xmlFreeDoc(doc); + return(NULL); + } + ns = ns->next; + } + + /* + * Evaluate xpath + */ + xpath = xmlXPathEvalExpression(expr, ctx); + if(xpath == NULL) { + fprintf(stderr,"Error: unable to evaluate xpath expression\n"); + xmlFree(expr); + xmlXPathFreeContext(ctx); + xmlFreeDoc(doc); + return(NULL); + } + + /* print_xpath_nodes(xpath->nodesetval); */ + + xmlFree(expr); + xmlXPathFreeContext(ctx); + xmlFreeDoc(doc); + return(xpath); +} + +#if 0 +static void +print_xpath_nodes(xmlNodeSetPtr nodes) { + xmlNodePtr cur; + int i; + + if(nodes == NULL ){ + fprintf(stderr, "Error: no nodes set defined\n"); + return; + } + + fprintf(stderr, "Nodes Set:\n-----\n"); + for(i = 0; i < nodes->nodeNr; ++i) { + if(nodes->nodeTab[i]->type == XML_NAMESPACE_DECL) { + xmlNsPtr ns; + + ns = (xmlNsPtr)nodes->nodeTab[i]; + cur = (xmlNodePtr)ns->next; + fprintf(stderr, "namespace \"%s\"=\"%s\" for node %s:%s\n", + ns->prefix, ns->href, + (cur->ns) ? cur->ns->prefix : BAD_CAST "", cur->name); + } else if(nodes->nodeTab[i]->type == XML_ELEMENT_NODE) { + cur = nodes->nodeTab[i]; + fprintf(stderr, "element node \"%s:%s\"\n", + (cur->ns) ? cur->ns->prefix : BAD_CAST "", cur->name); + } else { + cur = nodes->nodeTab[i]; + fprintf(stderr, "node \"%s\": type %d\n", cur->name, cur->type); + } + } +} +#endif + +#else +#include <stdio.h> +int c14nMain(int argc, char **argv) { + printf("%s : XPath/Canonicalization support not compiled in\n", argv[0]); + return 2; +} +#endif /* LIBXML_C14N_ENABLED */ + |