147 lines
2.8 KiB
C
147 lines
2.8 KiB
C
/*
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SPDX-License-Identifier: GPL-2.0-only
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Copyright (C) 2008 Arnaldo Carvalho de Melo <acme@redhat.com>
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Grow only buffer, add entries but never delete
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*/
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#include "gobuffer.h"
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#include <search.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <zlib.h>
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#include <errno.h>
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#include "dutil.h"
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#define GOBUFFER__BCHUNK (8 * 1024)
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#define GOBUFFER__ZCHUNK (8 * 1024)
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void gobuffer__init(struct gobuffer *gb)
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{
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gb->entries = NULL;
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gb->nr_entries = gb->allocated_size = 0;
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/* 0 == NULL */
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gb->index = 1;
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}
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struct gobuffer *gobuffer__new(void)
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{
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struct gobuffer *gb = malloc(sizeof(*gb));
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if (gb != NULL)
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gobuffer__init(gb);
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return gb;
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}
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void __gobuffer__delete(struct gobuffer *gb)
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{
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if (gb == NULL)
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return;
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zfree(&gb->entries);
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}
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void gobuffer__delete(struct gobuffer *gb)
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{
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__gobuffer__delete(gb);
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free(gb);
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}
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void *gobuffer__ptr(const struct gobuffer *gb, unsigned int s)
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{
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return s ? gb->entries + s : NULL;
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}
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int gobuffer__allocate(struct gobuffer *gb, unsigned int len)
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{
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const unsigned int rc = gb->index;
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const unsigned int index = gb->index + len;
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if (index >= gb->allocated_size) {
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unsigned int allocated_size = (gb->allocated_size +
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GOBUFFER__BCHUNK);
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if (allocated_size < index)
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allocated_size = index + GOBUFFER__BCHUNK;
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char *entries = realloc(gb->entries, allocated_size);
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if (entries == NULL)
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return -ENOMEM;
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gb->allocated_size = allocated_size;
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gb->entries = entries;
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}
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gb->index = index;
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return rc;
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}
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int gobuffer__add(struct gobuffer *gb, const void *s, unsigned int len)
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{
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const int rc = gobuffer__allocate(gb, len);
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if (rc >= 0) {
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++gb->nr_entries;
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memcpy(gb->entries + rc, s, len);
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}
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return rc;
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}
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void gobuffer__copy(const struct gobuffer *gb, void *dest)
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{
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if (gb->entries) {
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memcpy(dest, gb->entries, gobuffer__size(gb));
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} else {
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/* gobuffer__size will be 0 or 1. */
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memcpy(dest, "", gobuffer__size(gb));
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}
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}
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const void *gobuffer__compress(struct gobuffer *gb, unsigned int *size)
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{
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z_stream z = {
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.zalloc = Z_NULL,
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.zfree = Z_NULL,
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.opaque = Z_NULL,
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.avail_in = gobuffer__size(gb),
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.next_in = (Bytef *)(gobuffer__entries(gb) ? : ""),
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};
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void *bf = NULL;
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unsigned int bf_size = 0;
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if (deflateInit(&z, Z_BEST_COMPRESSION) != Z_OK)
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goto out_free;
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do {
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const unsigned int new_bf_size = bf_size + GOBUFFER__ZCHUNK;
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void *nbf = realloc(bf, new_bf_size);
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if (nbf == NULL)
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goto out_close_and_free;
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bf = nbf;
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z.avail_out = GOBUFFER__ZCHUNK;
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z.next_out = (Bytef *)bf + bf_size;
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bf_size = new_bf_size;
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if (deflate(&z, Z_FINISH) == Z_STREAM_ERROR)
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goto out_close_and_free;
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} while (z.avail_out == 0);
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deflateEnd(&z);
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*size = bf_size - z.avail_out;
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out:
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return bf;
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out_close_and_free:
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deflateEnd(&z);
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out_free:
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free(bf);
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bf = NULL;
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goto out;
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}
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