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