zip_source_buffer.c [plain text]
#include <stdlib.h>
#include <string.h>
#include "zipint.h"
struct read_data {
const char *buf, *data, *end;
time_t mtime;
int freep;
};
static zip_int64_t read_data(void *, void *, zip_uint64_t, enum zip_source_cmd);
ZIP_EXTERN struct zip_source *
zip_source_buffer(struct zip *za, const void *data, zip_uint64_t len, int freep)
{
struct read_data *f;
struct zip_source *zs;
if (za == NULL)
return NULL;
if (data == NULL && len > 0) {
_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
return NULL;
}
if ((f=(struct read_data *)malloc(sizeof(*f))) == NULL) {
_zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
return NULL;
}
f->data = (const char *)data;
f->end = ((const char *)data)+len;
f->freep = freep;
f->mtime = time(NULL);
if ((zs=zip_source_function(za, read_data, f)) == NULL) {
free(f);
return NULL;
}
return zs;
}
static zip_int64_t
read_data(void *state, void *data, zip_uint64_t len, enum zip_source_cmd cmd)
{
struct read_data *z;
char *buf;
zip_uint64_t n;
z = (struct read_data *)state;
buf = (char *)data;
switch (cmd) {
case ZIP_SOURCE_OPEN:
z->buf = z->data;
return 0;
case ZIP_SOURCE_READ:
n = (zip_uint64_t)(z->end - z->buf);
if (n > len)
n = len;
if (n) {
memcpy(buf, z->buf, n);
z->buf += n;
}
return (zip_int64_t)n;
case ZIP_SOURCE_CLOSE:
return 0;
case ZIP_SOURCE_STAT:
{
struct zip_stat *st;
if (len < sizeof(*st))
return -1;
st = (struct zip_stat *)data;
zip_stat_init(st);
st->mtime = z->mtime;
st->size = (zip_uint64_t)(z->end - z->data);
st->comp_size = st->size;
st->comp_method = ZIP_CM_STORE;
st->encryption_method = ZIP_EM_NONE;
st->valid = ZIP_STAT_MTIME|ZIP_STAT_SIZE|ZIP_STAT_COMP_SIZE
|ZIP_STAT_COMP_METHOD|ZIP_STAT_ENCRYPTION_METHOD;
return sizeof(*st);
}
case ZIP_SOURCE_ERROR:
{
int *e;
if (len < sizeof(int)*2)
return -1;
e = (int *)data;
e[0] = e[1] = 0;
}
return sizeof(int)*2;
case ZIP_SOURCE_FREE:
if (z->freep) {
free((void *)z->data);
z->data = NULL;
}
free(z);
return 0;
default:
;
}
return -1;
}