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https://github.com/aaru-dps/Aaru.Compression.Native.git
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74 lines
2.0 KiB
C
74 lines
2.0 KiB
C
/*
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* This file is part of the Aaru Data Preservation Suite.
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* Copyright (c) 2019-2026 Natalia Portillo.
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of the
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* License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "blast_buf.h"
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#include "blast.h"
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#include <string.h>
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/* Context for buffer-based input callback */
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struct blast_in_ctx
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{
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const uint8_t *buf;
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size_t len;
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int done;
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};
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/* Context for buffer-based output callback */
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struct blast_out_ctx
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{
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uint8_t *buf;
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size_t len;
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size_t pos;
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};
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/* Input callback: provide all data in one shot */
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static unsigned blast_in_buf(void *how, unsigned char **buf)
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{
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struct blast_in_ctx *ctx = (struct blast_in_ctx *)how;
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if(ctx->done) return 0;
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*buf = (unsigned char *)ctx->buf;
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ctx->done = 1;
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return (unsigned)ctx->len;
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}
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/* Output callback: copy to output buffer */
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static int blast_out_buf(void *how, unsigned char *buf, unsigned len)
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{
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struct blast_out_ctx *ctx = (struct blast_out_ctx *)how;
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if(ctx->pos + len > ctx->len) return 1; /* output buffer overflow */
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memcpy(ctx->buf + ctx->pos, buf, len);
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ctx->pos += len;
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return 0;
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}
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int zip_blast_decompress(const uint8_t *in_buf, size_t in_len, uint8_t *out_buf, size_t *out_len)
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{
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struct blast_in_ctx in_ctx = {in_buf, in_len, 0};
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struct blast_out_ctx out_ctx = {out_buf, *out_len, 0};
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int err = blast(blast_in_buf, &in_ctx, blast_out_buf, &out_ctx, NULL, NULL);
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*out_len = out_ctx.pos;
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return err;
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}
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