#include "zipint.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
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;
}
struct zip_extra_field *
_zip_ef_delete_by_id(struct zip_extra_field *ef, zip_uint16_t id, zip_uint16_t id_idx, zip_flags_t flags)
{
struct zip_extra_field *head, *prev;
int i;
i = 0;
head = ef;
prev = NULL;
for (; ef; ef=(prev ? prev->next : head)) {
if ((ef->flags & flags & ZIP_EF_BOTH) && ((ef->id == id) || (id == ZIP_EXTRA_FIELD_ALL))) {
if (id_idx == ZIP_EXTRA_FIELD_ALL || i == id_idx) {
ef->flags &= ~(flags & ZIP_EF_BOTH);
if ((ef->flags & ZIP_EF_BOTH) == 0) {
if (prev)
prev->next = ef->next;
else
head = ef->next;
ef->next = NULL;
_zip_ef_free(ef);
if (id_idx == ZIP_EXTRA_FIELD_ALL)
continue;
}
}
i++;
if (i > id_idx)
break;
}
prev = ef;
}
return head;
}
void
_zip_ef_free(struct zip_extra_field *ef)
{
struct zip_extra_field *ef2;
while (ef) {
ef2 = ef->next;
free(ef->data);
free(ef);
ef = ef2;
}
}
const zip_uint8_t *
_zip_ef_get_by_id(const struct zip_extra_field *ef, zip_uint16_t *lenp, zip_uint16_t id, zip_uint16_t id_idx, zip_flags_t flags, struct zip_error *error)
{
static const zip_uint8_t empty[1] = { '\0' };
int i;
i = 0;
for (; ef; ef=ef->next) {
if (ef->id == id && (ef->flags & flags & ZIP_EF_BOTH)) {
if (i < id_idx) {
i++;
continue;
}
if (lenp)
*lenp = ef->size;
if (ef->size > 0)
return ef->data;
else
return empty;
}
}
_zip_error_set(error, ZIP_ER_NOENT, 0);
return NULL;
}
struct zip_extra_field *
_zip_ef_merge(struct zip_extra_field *to, struct zip_extra_field *from)
{
struct zip_extra_field *ef2, *tt, *tail;
int duplicate;
if (to == NULL)
return from;
for (tail=to; tail->next; tail=tail->next)
;
for (; from; from=ef2) {
ef2 = from->next;
duplicate = 0;
for (tt=to; tt; tt=tt->next) {
if (tt->id == from->id && tt->size == from->size && memcmp(tt->data, from->data, tt->size) == 0) {
tt->flags |= (from->flags & ZIP_EF_BOTH);
duplicate = 1;
break;
}
}
from->next = NULL;
if (duplicate)
_zip_ef_free(from);
else
tail = tail->next = from;
}
return to;
}
struct zip_extra_field *
_zip_ef_new(zip_uint16_t id, zip_uint16_t size, const zip_uint8_t *data, zip_flags_t flags)
{
struct zip_extra_field *ef;
if ((ef=(struct zip_extra_field *)malloc(sizeof(*ef))) == NULL)
return NULL;
ef->next = NULL;
ef->flags = flags;
ef->id = id;
ef->size = size;
if (size > 0) {
if ((ef->data=(zip_uint8_t *)_zip_memdup(data, size, NULL)) == NULL) {
free(ef);
return NULL;
}
}
else
ef->data = NULL;
return ef;
}
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;
}
struct zip_extra_field *
_zip_ef_remove_internal(struct zip_extra_field *ef)
{
struct zip_extra_field *ef_head;
struct zip_extra_field *prev, *next;
ef_head = ef;
prev = NULL;
while (ef) {
if (ZIP_EF_IS_INTERNAL(ef->id)) {
next = ef->next;
if (ef_head == ef)
ef_head = next;
ef->next = NULL;
_zip_ef_free(ef);
if (prev)
prev->next = next;
ef = next;
}
else {
prev = ef;
ef = ef->next;
}
}
return ef_head;
}
zip_uint16_t
_zip_ef_size(const struct zip_extra_field *ef, zip_flags_t flags)
{
zip_uint16_t size;
size = 0;
for (; ef; ef=ef->next) {
if (ef->flags & flags & ZIP_EF_BOTH)
size += 4+ef->size;
}
return size;
}
void
_zip_ef_write(const struct zip_extra_field *ef, zip_flags_t flags, FILE *f)
{
for (; ef; ef=ef->next) {
if (ef->flags & flags & ZIP_EF_BOTH) {
_zip_write2(ef->id, f);
_zip_write2(ef->size, f);
if (ef->size > 0)
fwrite(ef->data, ef->size, 1, f);
}
}
}
int
_zip_read_local_ef(struct zip *za, zip_uint64_t idx)
{
struct zip_entry *e;
unsigned char b[4];
const unsigned char *p;
zip_uint16_t fname_len, ef_len;
if (idx >= za->nentry) {
_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
return -1;
}
e = za->entry+idx;
if (e->orig == NULL || e->orig->local_extra_fields_read)
return 0;
if (fseeko(za->zp, (off_t)(e->orig->offset + 26), SEEK_SET) < 0) {
_zip_error_set(&za->error, ZIP_ER_SEEK, errno);
return -1;
}
if (fread(b, sizeof(b), 1, za->zp) != 1) {
_zip_error_set(&za->error, ZIP_ER_READ, errno);
return -1;
}
p = b;
fname_len = _zip_read2(&p);
ef_len = _zip_read2(&p);
if (ef_len > 0) {
struct zip_extra_field *ef;
zip_uint8_t *ef_raw;
if (fseek(za->zp, fname_len, SEEK_CUR) < 0) {
_zip_error_set(&za->error, ZIP_ER_SEEK, errno);
return -1;
}
ef_raw = _zip_read_data(NULL, za->zp, ef_len, 0, &za->error);
if (ef_raw == NULL)
return -1;
if ((ef=_zip_ef_parse(ef_raw, ef_len, ZIP_EF_LOCAL, &za->error)) == NULL) {
free(ef_raw);
return -1;
}
free(ef_raw);
ef = _zip_ef_remove_internal(ef);
e->orig->extra_fields = _zip_ef_merge(e->orig->extra_fields, ef);
}
e->orig->local_extra_fields_read = 1;
if (e->changes && e->changes->local_extra_fields_read == 0) {
e->changes->extra_fields = e->orig->extra_fields;
e->changes->local_extra_fields_read = 1;
}
return 0;
}