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/*
* Copyright (C) Andrew Clayton
* Copyright (C) F5, Inc.
*/
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include <zlib.h>
#include "nxt_http_compression.h"
static int
nxt_zlib_gzip_init(nxt_http_comp_compressor_ctx_t *ctx)
{
z_stream *z = &ctx->zlib_ctx;
*z = (z_stream){};
return deflateInit2(z, ctx->level, Z_DEFLATED, 9 + 16, 8,
Z_DEFAULT_STRATEGY);
}
static int
nxt_zlib_deflate_init(nxt_http_comp_compressor_ctx_t *ctx)
{
z_stream *z = &ctx->zlib_ctx;
*z = (z_stream){};
return deflateInit2(z, ctx->level, Z_DEFLATED, 9, 8, Z_DEFAULT_STRATEGY);
}
static size_t
nxt_zlib_bound(const nxt_http_comp_compressor_ctx_t *ctx, size_t in_len)
{
z_stream *z = (z_stream *)&ctx->zlib_ctx;
return deflateBound(z, in_len);
}
static ssize_t
nxt_zlib_deflate(nxt_http_comp_compressor_ctx_t *ctx, const uint8_t *in_buf,
size_t in_len, uint8_t *out_buf, size_t out_len, bool last)
{
int ret;
size_t compressed_bytes;
z_stream *z = &ctx->zlib_ctx;
z->avail_in = in_len;
z->next_in = (z_const Bytef *)in_buf;
z->avail_out = out_len;
z->next_out = out_buf;
compressed_bytes = z->total_out;
ret = deflate(z, last ? Z_FINISH : Z_SYNC_FLUSH);
if (ret == Z_STREAM_ERROR || ret == Z_BUF_ERROR) {
deflateEnd(z);
return -1;
}
if (last) {
deflateEnd(z);
}
return z->total_out - compressed_bytes;
}
const nxt_http_comp_operations_t nxt_http_comp_deflate_ops = {
.init = nxt_zlib_deflate_init,
.bound = nxt_zlib_bound,
.deflate = nxt_zlib_deflate,
};
const nxt_http_comp_operations_t nxt_http_comp_gzip_ops = {
.init = nxt_zlib_gzip_init,
.bound = nxt_zlib_bound,
.deflate = nxt_zlib_deflate,
};
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