Small utility collection for dealing with file archives that have dependencies
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
pkg-utils/main/compressors/none.c

91 lines
1.7 KiB

/* SPDX-License-Identifier: ISC */
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <zlib.h>
#include "compressor.h"
#define CHUNK_SIZE 16384
typedef struct {
compressor_stream_t base;
uint8_t chunk[CHUNK_SIZE];
size_t used;
} dummy_stream_t;
static ssize_t dummy_write(compressor_stream_t *base,
const uint8_t *in, size_t size)
{
dummy_stream_t *dummy = (dummy_stream_t *)base;
if (size > (CHUNK_SIZE - dummy->used))
size = CHUNK_SIZE - dummy->used;
if (size == 0)
return 0;
memcpy(dummy->chunk + dummy->used, in, size);
dummy->used += size;
return size;
}
static ssize_t dummy_read(compressor_stream_t *base,
uint8_t *out, size_t size)
{
dummy_stream_t *dummy = (dummy_stream_t *)base;
if (size > dummy->used)
size = dummy->used;
if (size == 0)
return 0;
memcpy(out, dummy->chunk, size);
if (size < dummy->used) {
memmove(dummy->chunk, dummy->chunk + size,
dummy->used - size);
}
dummy->used -= size;
return size;
}
static void dummy_flush(compressor_stream_t *base)
{
(void)base;
}
static void dummy_destroy(compressor_stream_t *base)
{
free(base);
}
static compressor_stream_t *create_dummy_stream(compressor_t *cmp)
{
dummy_stream_t *dummy = calloc(1, sizeof(*dummy));
compressor_stream_t *base;
(void)cmp;
if (dummy == NULL) {
perror("creating dummy compressor stream");
return NULL;
}
base = (compressor_stream_t *)dummy;
base->write = dummy_write;
base->read = dummy_read;
base->flush = dummy_flush;
base->destroy = dummy_destroy;
return base;
}
static compressor_t none = {
.name = "none",
.id = PKG_COMPRESSION_NONE,
.compression_stream = create_dummy_stream,
.uncompression_stream = create_dummy_stream,
};
REGISTER_COMPRESSOR(none)