struct zip_extra_field *
_zip_ef_clone(const struct zip_extra_field *ef, struct zip_error *error)
{
struct zip_extra_field *head, *prev, *def;
head = prev = NULL;
while (ef) {
if ((def=_zip_ef_new(ef->id, ef->size, ef->data, ef->flags)) == NULL) {
_zip_error_set(error, ZIP_ER_MEMORY, 0);
_zip_ef_free(head);
return NULL;
}
if (head == NULL)
head = def;
if (prev)
prev->next = def;
prev = def;
ef = ef->next;
}
return head;
}
zip_extra_field_t *
_zip_ef_parse(const zip_uint8_t *data, zip_uint16_t len, zip_flags_t flags, zip_error_t *error)
{
zip_buffer_t *buffer;
zip_extra_field_t *ef, *ef2, *ef_head;
if ((buffer = _zip_buffer_new((zip_uint8_t *)data, len)) == NULL) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
return NULL;
}
ef_head = ef = NULL;
while (_zip_buffer_ok(buffer) && !_zip_buffer_eof(buffer)) {
zip_uint16_t fid, flen;
zip_uint8_t *ef_data;
fid = _zip_buffer_get_16(buffer);
flen = _zip_buffer_get_16(buffer);
ef_data = _zip_buffer_get(buffer, flen);
if (ef_data == NULL) {
break;
}
if ((ef2=_zip_ef_new(fid, flen, ef_data, flags)) == NULL) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
_zip_buffer_free(buffer);
_zip_ef_free(ef_head);
return NULL;
}
if (ef_head) {
ef->next = ef2;
ef = ef2;
}
else
ef_head = ef = ef2;
}
if (!_zip_buffer_eof(buffer)) {
zip_error_set(error, ZIP_ER_INCONS, 0);
_zip_buffer_free(buffer);
_zip_ef_free(ef_head);
return NULL;
}
_zip_buffer_free(buffer);
return ef_head;
}
struct zip_extra_field *
_zip_ef_parse(const zip_uint8_t *data, zip_uint16_t len, zip_flags_t flags, struct zip_error *error)
{
struct zip_extra_field *ef, *ef2, *ef_head;
const zip_uint8_t *p;
zip_uint16_t fid, flen;
ef_head = NULL;
for (p=data; p<data+len; p+=flen) {
if (p+4 > data+len) {
_zip_error_set(error, ZIP_ER_INCONS, 0);
_zip_ef_free(ef_head);
return NULL;
}
fid = _zip_read2(&p);
flen = _zip_read2(&p);
if (p+flen > data+len) {
_zip_error_set(error, ZIP_ER_INCONS, 0);
_zip_ef_free(ef_head);
return NULL;
}
if ((ef2=_zip_ef_new(fid, flen, p, flags)) == NULL) {
_zip_error_set(error, ZIP_ER_MEMORY, 0);
_zip_ef_free(ef_head);
return NULL;
}
if (ef_head) {
ef->next = ef2;
ef = ef2;
}
else
ef_head = ef = ef2;
}
return ef_head;
}
bool
_zip_ef_parse(const zip_uint8_t *data, zip_uint16_t len, zip_flags_t flags, zip_extra_field_t **ef_head_p, zip_error_t *error)
{
zip_buffer_t *buffer;
zip_extra_field_t *ef, *ef2, *ef_head;
if ((buffer = _zip_buffer_new((zip_uint8_t *)data, len)) == NULL) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
return false;
}
ef_head = ef = NULL;
while (_zip_buffer_ok(buffer) && _zip_buffer_left(buffer) >= 4) {
zip_uint16_t fid, flen;
zip_uint8_t *ef_data;
fid = _zip_buffer_get_16(buffer);
flen = _zip_buffer_get_16(buffer);
ef_data = _zip_buffer_get(buffer, flen);
if (ef_data == NULL) {
zip_error_set(error, ZIP_ER_INCONS, 0);
_zip_buffer_free(buffer);
_zip_ef_free(ef_head);
return false;
}
if ((ef2=_zip_ef_new(fid, flen, ef_data, flags)) == NULL) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
_zip_buffer_free(buffer);
_zip_ef_free(ef_head);
return false;
}
if (ef_head) {
ef->next = ef2;
ef = ef2;
}
else
ef_head = ef = ef2;
}
if (!_zip_buffer_eof(buffer)) {
/* Android APK files align stored file data with padding in extra fields; ignore. */
/* see https://android.googlesource.com/platform/build/+/master/tools/zipalign/ZipAlign.cpp */
size_t glen = _zip_buffer_left(buffer);
zip_uint8_t *garbage;
garbage = _zip_buffer_get(buffer, glen);
if (glen >= 4 || garbage == NULL || memcmp(garbage, "\0\0\0", glen) != 0) {
zip_error_set(error, ZIP_ER_INCONS, 0);
_zip_buffer_free(buffer);
_zip_ef_free(ef_head);
return false;
}
}
_zip_buffer_free(buffer);
if (ef_head_p) {
*ef_head_p = ef_head;
}
else {
_zip_ef_free(ef_head);
}
return true;
}
ZIP_EXTERN int
zip_file_extra_field_set(struct zip *za, zip_uint64_t idx, zip_uint16_t ef_id, zip_uint16_t ef_idx, const zip_uint8_t *data, zip_uint16_t len, zip_flags_t flags)
{
struct zip_dirent *de;
zip_uint16_t ls, cs;
struct zip_extra_field *ef, *ef_prev, *ef_new;
int i, found, new_len;
if ((flags & ZIP_EF_BOTH) == 0) {
_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
return -1;
}
if (_zip_get_dirent(za, idx, 0, NULL) == NULL)
return -1;
if (ZIP_IS_RDONLY(za)) {
_zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
return -1;
}
if (ZIP_EF_IS_INTERNAL(ef_id)) {
_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
return -1;
}
if (_zip_file_extra_field_prepare_for_change(za, idx) < 0)
return -1;
de = za->entry[idx].changes;
ef = de->extra_fields;
ef_prev = NULL;
i = 0;
found = 0;
for (; ef; ef=ef->next) {
if (ef->id == ef_id && (ef->flags & flags & ZIP_EF_BOTH)) {
if (i == ef_idx) {
found = 1;
break;
}
i++;
}
ef_prev = ef;
}
if (i < ef_idx && ef_idx != ZIP_EXTRA_FIELD_NEW) {
_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
return -1;
}
if (flags & ZIP_EF_LOCAL)
ls = _zip_ef_size(de->extra_fields, ZIP_EF_LOCAL);
else
ls = 0;
if (flags & ZIP_EF_CENTRAL)
cs = _zip_ef_size(de->extra_fields, ZIP_EF_CENTRAL);
else
cs = 0;
new_len = ls > cs ? ls : cs;
if (found)
new_len -= ef->size + 4;
new_len += len + 4;
if (new_len > ZIP_UINT16_MAX) {
_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
return -1;
}
if ((ef_new=_zip_ef_new(ef_id, len, data, flags)) == NULL) {
_zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
return -1;
}
if (found) {
if ((ef->flags & ZIP_EF_BOTH) == (flags & ZIP_EF_BOTH)) {
ef_new->next = ef->next;
ef->next = NULL;
_zip_ef_free(ef);
if (ef_prev)
ef_prev->next = ef_new;
else
de->extra_fields = ef_new;
}
else {
ef->flags &= ~(flags & ZIP_EF_BOTH);
ef_new->next = ef->next;
ef->next = ef_new;
}
}
else if (ef_prev) {
ef_new->next = ef_prev->next;
ef_prev->next = ef_new;
}
else
de->extra_fields = ef_new;
return 0;
}
