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Add preliminary code to read CRCs from XML. CRC value still missing

This commit is contained in:
Mario Hüttel 2023-01-04 21:42:12 +01:00
parent fda6e92615
commit 2c50964581
1 changed files with 78 additions and 7 deletions
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85
src/xml.c
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@ -9,6 +9,7 @@
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <inttypes.h>
#include <patchelfcrc/reporting.h>
@ -155,8 +156,8 @@ ret_none:
* @param xpath_ctx Context
* @param required Print error if not found
* @return NULL in case of error
* @return pointer to newly alloceted string data.
* @note Pointers retured from this function must be freed using xmlFree()
* @return pointer to newly allocated string data.
* @note Pointers returned from this function must be freed using xmlFree()
*/
static const char *get_node_content_from_xpath(const char *path, xmlXPathContextPtr xpath_ctx, bool required)
{
@ -276,15 +277,53 @@ static int get_uint32_from_xpath_content(const char *xpath, xmlXPathContextPtr x
return ret;
}
int get_uint64_from_node_attribute(xmlNodePtr node, const char *attr, uint64_t *output)
{
xmlChar *data;
uint64_t num;
int ret = -1;
data = xmlGetProp(node, BAD_CAST attr);
if (data) {
if (!convert_number_string_to_uint((const char *)data, &num)) {
ret = 0;
*output = num;
}
xmlFree(data);
}
return ret;
}
int get_uint32_from_node_attribute(xmlNodePtr node, const char *attr, uint32_t *output)
{
int ret;
uint64_t tmp = 0;
ret = get_uint64_from_node_attribute(node, attr, &tmp);
if (tmp > UINT32_MAX || ret) {
print_err("Cannot conver attribute %s to number\n", attr);
ret = -1;
} else {
*output = (uint32_t)tmp;
}
return ret;
}
struct xml_crc_import *xml_import_from_file(const char *path)
{
struct xml_crc_import *ret = NULL;
struct xml_crc_entry *crc;
xmlDocPtr doc;
xmlNodePtr root_node, settings_node, crc_node, iter;
xmlNodePtr root_node;
xmlNodePtr current_node;
xmlXPathContextPtr xpath_ctx = NULL;
xmlXPathObjectPtr xpath_obj = NULL;
uint64_t tmp_num64 = 0;
uint32_t tmp_num32 = 0;
int i;
const char *cptr;
if (!path)
@ -312,6 +351,17 @@ struct xml_crc_import *xml_import_from_file(const char *path)
goto ret_close_doc;
}
/* Get the version number and print error in case of incompatibility. Continue either way */
cptr = (char *)xmlGetProp(root_node, BAD_CAST "version");
if (cptr) {
if (strncmp(cptr, version_string, strlen(version_string)) != 0) {
print_err("XML file was generated with another version of patchelfcrc.\n");
print_err("\t XML shows: %s\n", cptr);
print_err("\t Program version: %s\n", version_string);
}
xmlFree((char *)cptr);
}
/* Allocate xml import structure */
ret = xml_crc_import_alloc();
if (!ret)
@ -336,14 +386,35 @@ struct xml_crc_import *xml_import_from_file(const char *path)
ret->crc_config.rev = false;
}
(void)get_uint32_from_xpath_content("/patchelfcrc/settings/elfclass", xpath_ctx, &tmp_num32, true);
ret->elf_bits = (int)tmp_num32;
goto ret_close_doc;
/* Get all CRCs */
xpath_obj = xmlXPathEvalExpression(BAD_CAST "/patchelfcrc/sections/crc", xpath_ctx);
if (xmlXPathNodeSetIsEmpty(xpath_obj->nodesetval)) {
print_err("Internal error during read\n")
xml_crc_import_free(ret);
ret = NULL;
goto ret_close_doc;
}
for (i = 0; i < xpath_obj->nodesetval->nodeNr; i++) {
current_node = xpath_obj->nodesetval->nodeTab[i];
crc = (struct xml_crc_entry *)malloc(sizeof(struct xml_crc_entry));
ret->xml_crc_entries = sl_list_append(ret->xml_crc_entries, crc);
get_uint64_from_node_attribute(current_node, "vma", &tmp_num64);
printf("vma: %x\n", (uint32_t)tmp_num64);
get_uint64_from_node_attribute(current_node, "size", &tmp_num64);
printf("size: %x\n", (uint32_t)tmp_num64);
}
ret_dealloc:
xml_crc_import_free(ret);
ret = NULL;
ret_close_doc:
if (xpath_obj)
xmlXPathFreeObject(xpath_obj);
if (xpath_ctx)
xmlXPathFreeContext(xpath_ctx);