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Sort central directory entries in ascending order by offset

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olszomal 2024-03-20 09:28:59 +01:00 committed by Michał Trojnara
parent e8ef027776
commit d9db038c65
1 changed files with 53 additions and 1 deletions
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54
appx.c
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@ -153,6 +153,8 @@ typedef struct zipCentralDirectoryEntry_struct {
struct zipCentralDirectoryEntry_struct *next;
} ZIP_CENTRAL_DIRECTORY_ENTRY;
DEFINE_STACK_OF(ZIP_CENTRAL_DIRECTORY_ENTRY)
/* Zip64 end of central directory record */
typedef struct {
uint64_t eocdrSize;
@ -301,6 +303,7 @@ static int zipInflate(uint8_t *dest, uint64_t *destLen, uint8_t *source, uLong *
static int zipDeflate(uint8_t *dest, uint64_t *destLen, uint8_t *source, uLong sourceLen);
static ZIP_FILE *openZip(const char *filename);
static void freeZip(ZIP_FILE *zip);
static ZIP_FILE *zipSortCentralDirectory(ZIP_FILE *zip);
static void zipPrintCentralDirectory(ZIP_FILE *zip);
static int zipReadCentralDirectory(ZIP_FILE *zip, FILE *file);
static ZIP_CENTRAL_DIRECTORY_ENTRY *zipReadNextCentralDirectoryEntry(FILE *file);
@ -2252,7 +2255,7 @@ static ZIP_FILE *openZip(const char *filename)
freeZip(zip);
return NULL; /* FAILED */
}
return zip;
return zipSortCentralDirectory(zip);
}
/*
@ -2281,6 +2284,55 @@ static void freeZip(ZIP_FILE *zip)
OPENSSL_free(zip);
}
/*
* Offset comparison function.
* [in] a_ptr, b_ptr: pointers to ZIP_CENTRAL_DIRECTORY_ENTRY structure
* [returns] entries order
*/
static int entry_compare(const ZIP_CENTRAL_DIRECTORY_ENTRY *const *a, const ZIP_CENTRAL_DIRECTORY_ENTRY *const *b)
{
return (*a)->offsetOfLocalHeader < (*b)->offsetOfLocalHeader ? -1 : 1;
}
/*
* Sort central directory entries in ascending order by offset.
* [in] zip: ZIP_FILE structure
* [returns] pointer to sorted ZIP_FILE structure
*/
static ZIP_FILE *zipSortCentralDirectory(ZIP_FILE *zip)
{
uint64_t noEntries = 0;
int i;
ZIP_CENTRAL_DIRECTORY_ENTRY *entry;
STACK_OF(ZIP_CENTRAL_DIRECTORY_ENTRY) *chain = sk_ZIP_CENTRAL_DIRECTORY_ENTRY_new(entry_compare);
for (entry = zip->centralDirectoryHead; entry != NULL; entry = entry->next) {
if (noEntries >= zip->centralDirectoryRecordCount) {
printf("Corrupted central directory structure\n");
sk_ZIP_CENTRAL_DIRECTORY_ENTRY_free(chain);
freeZip(zip);
return NULL;
}
noEntries++;
if (!sk_ZIP_CENTRAL_DIRECTORY_ENTRY_push(chain, entry)) {
printf("Failed to add central directory entry\n");
sk_ZIP_CENTRAL_DIRECTORY_ENTRY_free(chain);
freeZip(zip);
return NULL;
}
}
sk_ZIP_CENTRAL_DIRECTORY_ENTRY_sort(chain);
zip->centralDirectoryHead = entry = sk_ZIP_CENTRAL_DIRECTORY_ENTRY_value(chain, 0);
for (i=1; i<sk_ZIP_CENTRAL_DIRECTORY_ENTRY_num(chain); i++) {
entry->next = sk_ZIP_CENTRAL_DIRECTORY_ENTRY_value(chain, i);
entry = entry->next;
}
entry->next = NULL;
sk_ZIP_CENTRAL_DIRECTORY_ENTRY_free(chain);
return zip;
}
/*
* Log additional output.
* [in] ZIP_FILE structure