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|
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include <zlib.h>
typedef struct {
ngx_flag_t enable;
ngx_flag_t no_buffer;
ngx_bufs_t bufs;
ngx_uint_t http_version;
ngx_uint_t proxied;
int level;
size_t wbits;
size_t memlevel;
ssize_t min_length;
} ngx_http_gzip_conf_t;
#define NGX_HTTP_GZIP_PROXIED_OFF 0x0002
#define NGX_HTTP_GZIP_PROXIED_EXPIRED 0x0004
#define NGX_HTTP_GZIP_PROXIED_NO_CACHE 0x0008
#define NGX_HTTP_GZIP_PROXIED_NO_STORE 0x0010
#define NGX_HTTP_GZIP_PROXIED_PRIVATE 0x0020
#define NGX_HTTP_GZIP_PROXIED_NO_LM 0x0040
#define NGX_HTTP_GZIP_PROXIED_NO_ETAG 0x0080
#define NGX_HTTP_GZIP_PROXIED_AUTH 0x0100
#define NGX_HTTP_GZIP_PROXIED_ANY 0x0200
typedef struct {
ngx_chain_t *in;
ngx_chain_t *free;
ngx_chain_t *busy;
ngx_chain_t *out;
ngx_chain_t **last_out;
ngx_buf_t *in_buf;
ngx_buf_t *out_buf;
ngx_int_t bufs;
off_t length;
void *preallocated;
char *free_mem;
ngx_uint_t allocated;
unsigned flush:4;
unsigned redo:1;
unsigned pass:1;
unsigned done:1;
unsigned blocked:1;
size_t zin;
size_t zout;
uint32_t crc32;
z_stream zstream;
ngx_http_request_t *request;
} ngx_http_gzip_ctx_t;
static ngx_int_t ngx_http_gzip_proxied(ngx_http_request_t *r,
ngx_http_gzip_conf_t *conf);
static void *ngx_http_gzip_filter_alloc(void *opaque, u_int items,
u_int size);
static void ngx_http_gzip_filter_free(void *opaque, void *address);
ngx_inline static int ngx_http_gzip_error(ngx_http_gzip_ctx_t *ctx);
static u_char *ngx_http_gzip_log_ratio(ngx_http_request_t *r, u_char *buf,
uintptr_t data);
static ngx_int_t ngx_http_gzip_pre_conf(ngx_conf_t *cf);
static ngx_int_t ngx_http_gzip_filter_init(ngx_cycle_t *cycle);
static void *ngx_http_gzip_create_conf(ngx_conf_t *cf);
static char *ngx_http_gzip_merge_conf(ngx_conf_t *cf,
void *parent, void *child);
static char *ngx_http_gzip_set_window(ngx_conf_t *cf, void *post, void *data);
static char *ngx_http_gzip_set_hash(ngx_conf_t *cf, void *post, void *data);
static ngx_conf_num_bounds_t ngx_http_gzip_comp_level_bounds = {
ngx_conf_check_num_bounds, 1, 9
};
static ngx_conf_post_handler_pt ngx_http_gzip_set_window_p =
ngx_http_gzip_set_window;
static ngx_conf_post_handler_pt ngx_http_gzip_set_hash_p =
ngx_http_gzip_set_hash;
static ngx_conf_enum_t ngx_http_gzip_http_version[] = {
{ ngx_string("1.0"), NGX_HTTP_VERSION_10 },
{ ngx_string("1.1"), NGX_HTTP_VERSION_11 },
{ ngx_null_string, 0 }
};
static ngx_conf_bitmask_t ngx_http_gzip_proxied_mask[] = {
{ ngx_string("off"), NGX_HTTP_GZIP_PROXIED_OFF },
{ ngx_string("expired"), NGX_HTTP_GZIP_PROXIED_EXPIRED },
{ ngx_string("no-cache"), NGX_HTTP_GZIP_PROXIED_NO_CACHE },
{ ngx_string("no-store"), NGX_HTTP_GZIP_PROXIED_NO_STORE },
{ ngx_string("private"), NGX_HTTP_GZIP_PROXIED_PRIVATE },
{ ngx_string("no_last_modified"), NGX_HTTP_GZIP_PROXIED_NO_LM },
{ ngx_string("no_etag"), NGX_HTTP_GZIP_PROXIED_NO_ETAG },
{ ngx_string("auth"), NGX_HTTP_GZIP_PROXIED_AUTH },
{ ngx_string("any"), NGX_HTTP_GZIP_PROXIED_ANY },
{ ngx_null_string, 0 }
};
static ngx_command_t ngx_http_gzip_filter_commands[] = {
{ ngx_string("gzip"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_gzip_conf_t, enable),
NULL },
{ ngx_string("gzip_buffers"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2,
ngx_conf_set_bufs_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_gzip_conf_t, bufs),
NULL },
{ ngx_string("gzip_comp_level"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_num_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_gzip_conf_t, level),
&ngx_http_gzip_comp_level_bounds },
{ ngx_string("gzip_window"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_gzip_conf_t, wbits),
&ngx_http_gzip_set_window_p },
{ ngx_string("gzip_hash"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_gzip_conf_t, memlevel),
&ngx_http_gzip_set_hash_p },
{ ngx_string("gzip_no_buffer"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_gzip_conf_t, no_buffer),
NULL },
{ ngx_string("gzip_http_version"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_ANY,
ngx_conf_set_enum_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_gzip_conf_t, http_version),
&ngx_http_gzip_http_version },
{ ngx_string("gzip_proxied"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_ANY,
ngx_conf_set_bitmask_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_gzip_conf_t, proxied),
&ngx_http_gzip_proxied_mask },
{ ngx_string("gzip_min_length"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_gzip_conf_t, min_length),
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_gzip_filter_module_ctx = {
ngx_http_gzip_pre_conf, /* pre conf */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_gzip_create_conf, /* create location configuration */
ngx_http_gzip_merge_conf, /* merge location configuration */
};
ngx_module_t ngx_http_gzip_filter_module = {
NGX_MODULE,
&ngx_http_gzip_filter_module_ctx, /* module context */
ngx_http_gzip_filter_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
ngx_http_gzip_filter_init, /* init module */
NULL /* init child */
};
static ngx_http_log_op_name_t ngx_http_gzip_log_fmt_ops[] = {
{ ngx_string("gzip_ratio"), NGX_INT32_LEN + 3, ngx_http_gzip_log_ratio },
{ ngx_null_string, 0, NULL }
};
static u_char gzheader[10] = { 0x1f, 0x8b, Z_DEFLATED, 0, 0, 0, 0, 0, 0, 3 };
#if (HAVE_LITTLE_ENDIAN)
struct gztrailer {
uint32_t crc32;
uint32_t zlen;
};
#else /* HAVE_BIG_ENDIAN */
struct gztrailer {
u_char crc32[4];
u_char zlen[4];
};
#endif
static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
static ngx_http_output_body_filter_pt ngx_http_next_body_filter;
static ngx_int_t ngx_http_gzip_header_filter(ngx_http_request_t *r)
{
ngx_http_gzip_ctx_t *ctx;
ngx_http_gzip_conf_t *conf;
conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module);
if (!conf->enable
|| r->headers_out.status != NGX_HTTP_OK
|| r->header_only
|| r->http_version < conf->http_version
|| (r->headers_out.content_encoding
&& r->headers_out.content_encoding->value.len)
|| r->headers_in.accept_encoding == NULL
|| (r->headers_out.content_length_n != -1
&& r->headers_out.content_length_n < conf->min_length)
|| ngx_strstr(r->headers_in.accept_encoding->value.data, "gzip") == NULL
)
{
return ngx_http_next_header_filter(r);
}
/* TODO: "text/html" -> custom types */
if (r->headers_out.content_type
&& ngx_strncasecmp(r->headers_out.content_type->value.data,
"text/html", 9) != 0)
{
return ngx_http_next_header_filter(r);
}
if (r->headers_in.via) {
if (conf->proxied & NGX_HTTP_GZIP_PROXIED_OFF) {
return ngx_http_next_header_filter(r);
}
if (!(conf->proxied & NGX_HTTP_GZIP_PROXIED_ANY)
&& ngx_http_gzip_proxied(r, conf) == NGX_DECLINED)
{
return ngx_http_next_header_filter(r);
}
}
/*
* if the URL (without the "http://" prefix) is longer than 253 bytes
* then MSIE 4.x can not handle the compressed stream - it waits too long,
* hangs up or crashes
*/
if (r->headers_in.msie4 && r->unparsed_uri.len > 200) {
return ngx_http_next_header_filter(r);
}
ngx_http_create_ctx(r, ctx, ngx_http_gzip_filter_module,
sizeof(ngx_http_gzip_ctx_t), NGX_ERROR);
ctx->request = r;
r->headers_out.content_encoding =
ngx_http_add_header(&r->headers_out, ngx_http_headers_out);
if (r->headers_out.content_encoding == NULL) {
return NGX_ERROR;
}
r->headers_out.content_encoding->key.len = sizeof("Content-Encoding") - 1;
r->headers_out.content_encoding->key.data = (u_char *) "Content-Encoding";
r->headers_out.content_encoding->value.len = sizeof("gzip") - 1;
r->headers_out.content_encoding->value.data = (u_char *) "gzip";
ctx->length = r->headers_out.content_length_n;
r->headers_out.content_length_n = -1;
if (r->headers_out.content_length) {
r->headers_out.content_length->key.len = 0;
r->headers_out.content_length = NULL;
}
r->filter_need_in_memory = 1;
return ngx_http_next_header_filter(r);
}
static ngx_int_t ngx_http_gzip_proxied(ngx_http_request_t *r,
ngx_http_gzip_conf_t *conf)
{
time_t date, expires;
if (r->headers_in.authorization
&& (conf->proxied & NGX_HTTP_GZIP_PROXIED_AUTH))
{
return NGX_OK;
}
if (r->headers_out.expires) {
if (!(conf->proxied & NGX_HTTP_GZIP_PROXIED_EXPIRED)) {
return NGX_DECLINED;
}
expires = ngx_http_parse_time(r->headers_out.expires->value.data,
r->headers_out.expires->value.len);
if (expires == NGX_ERROR) {
return NGX_DECLINED;
}
if (r->headers_out.date) {
date = ngx_http_parse_time(r->headers_out.date->value.data,
r->headers_out.date->value.len);
if (date == NGX_ERROR) {
return NGX_DECLINED;
}
} else {
date = ngx_time();
}
if (expires < date) {
return NGX_OK;
}
return NGX_DECLINED;
}
if (r->headers_out.cache_control) {
if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_NO_CACHE)
&& ngx_strstr(r->headers_out.cache_control->value.data, "no-cache"))
{
return NGX_OK;
}
if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_NO_STORE)
&& ngx_strstr(r->headers_out.cache_control->value.data, "no-store"))
{
return NGX_OK;
}
if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_PRIVATE)
&& ngx_strstr(r->headers_out.cache_control->value.data, "private"))
{
return NGX_OK;
}
return NGX_DECLINED;
}
if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_NO_LM)
&& r->headers_out.last_modified)
{
return NGX_DECLINED;
}
if ((conf->proxied & NGX_HTTP_GZIP_PROXIED_NO_ETAG)
&& r->headers_out.etag)
{
return NGX_DECLINED;
}
return NGX_OK;
}
static ngx_int_t ngx_http_gzip_body_filter(ngx_http_request_t *r,
ngx_chain_t *in)
{
int rc, wbits, memlevel, last;
struct gztrailer *trailer;
ngx_buf_t *b;
ngx_chain_t *cl;
ngx_http_gzip_ctx_t *ctx;
ngx_http_gzip_conf_t *conf;
ctx = ngx_http_get_module_ctx(r, ngx_http_gzip_filter_module);
if (ctx == NULL || ctx->done) {
return ngx_http_next_body_filter(r, in);
}
conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module);
if (ctx->preallocated == NULL) {
wbits = conf->wbits;
memlevel = conf->memlevel;
if (ctx->length > 0) {
/* the actual zlib window size is smaller by 262 bytes */
while (ctx->length < ((1 << (wbits - 1)) - 262)) {
wbits--;
memlevel--;
}
}
/*
* We preallocate a memory for zlib in one buffer (200K-400K), this
* dicreases a number of malloc() and free() calls and also probably
* dicreases a number of syscalls (sbrk() or so).
* Besides we free this memory as soon as the gzipping will complete
* and do not wait while a whole response will be sent to a client.
*
* 8K is for zlib deflate_state (~6K).
*
* TODO: 64-bit, autoconf of deflate_state size
*/
ctx->allocated = 8192 + (1 << (wbits + 2)) + (1 << (memlevel + 9));
ngx_test_null(ctx->preallocated, ngx_palloc(r->pool, ctx->allocated),
NGX_ERROR);
ctx->free_mem = ctx->preallocated;
ctx->zstream.zalloc = ngx_http_gzip_filter_alloc;
ctx->zstream.zfree = ngx_http_gzip_filter_free;
ctx->zstream.opaque = ctx;
rc = deflateInit2(&ctx->zstream, conf->level, Z_DEFLATED,
-wbits, memlevel, Z_DEFAULT_STRATEGY);
if (rc != Z_OK) {
ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
"deflateInit2() failed: %d", rc);
return ngx_http_gzip_error(ctx);
}
ngx_test_null(b, ngx_calloc_buf(r->pool), ngx_http_gzip_error(ctx));
b->memory = 1;
b->pos = gzheader;
b->last = b->pos + 10;
ngx_alloc_link_and_set_buf(cl, b, r->pool, ngx_http_gzip_error(ctx));
ctx->out = cl;
ctx->last_out = &cl->next;
ctx->crc32 = crc32(0L, Z_NULL, 0);
ctx->flush = Z_NO_FLUSH;
}
if (in) {
if (ngx_chain_add_copy(r->pool, &ctx->in, in) == NGX_ERROR) {
return ngx_http_gzip_error(ctx);
}
}
last = NGX_NONE;
for ( ;; ) {
for ( ;; ) {
/* is there a data to gzip ? */
if (ctx->zstream.avail_in == 0
&& ctx->flush == Z_NO_FLUSH
&& !ctx->redo)
{
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"gzip in: " PTR_FMT, ctx->in);
if (ctx->in == NULL) {
break;
}
ctx->in_buf = ctx->in->buf;
ctx->in = ctx->in->next;
ctx->zstream.next_in = ctx->in_buf->pos;
ctx->zstream.avail_in = ctx->in_buf->last - ctx->in_buf->pos;
ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"gzip in_buf:" PTR_FMT " ni:" PTR_FMT " ai:%d",
ctx->in_buf,
ctx->zstream.next_in, ctx->zstream.avail_in);
/* STUB */
if (ctx->in_buf->last < ctx->in_buf->pos) {
ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
"zstream.avail_in is huge");
ctx->done = 1;
return NGX_ERROR;
}
if (ctx->in_buf->last_buf) {
ctx->flush = Z_FINISH;
} else if (ctx->in_buf->flush) {
ctx->flush = Z_SYNC_FLUSH;
}
if (ctx->zstream.avail_in == 0) {
if (ctx->flush == Z_NO_FLUSH) {
continue;
}
} else {
ctx->crc32 = crc32(ctx->crc32, ctx->zstream.next_in,
ctx->zstream.avail_in);
}
}
/* is there a space for the gzipped data ? */
if (ctx->zstream.avail_out == 0) {
if (ctx->free) {
ctx->out_buf = ctx->free->buf;
ctx->free = ctx->free->next;
} else if (ctx->bufs < conf->bufs.num) {
ngx_test_null(ctx->out_buf,
ngx_create_temp_buf(r->pool, conf->bufs.size),
ngx_http_gzip_error(ctx));
ctx->out_buf->tag = (ngx_buf_tag_t)
&ngx_http_gzip_filter_module;
ctx->out_buf->recycled = 1;
ctx->bufs++;
} else {
ctx->blocked = 1;
break;
}
ctx->blocked = 0;
ctx->zstream.next_out = ctx->out_buf->pos;
ctx->zstream.avail_out = conf->bufs.size;
}
ngx_log_debug6(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"deflate in: ni:%X no:%X ai:%d ao:%d fl:%d redo:%d",
ctx->zstream.next_in, ctx->zstream.next_out,
ctx->zstream.avail_in, ctx->zstream.avail_out,
ctx->flush, ctx->redo);
rc = deflate(&ctx->zstream, ctx->flush);
if (rc != Z_OK && rc != Z_STREAM_END) {
ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
"deflate() failed: %d, %d", ctx->flush, rc);
return ngx_http_gzip_error(ctx);
}
ngx_log_debug5(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"deflate out: ni:%X no:%X ai:%d ao:%d rc:%d",
ctx->zstream.next_in, ctx->zstream.next_out,
ctx->zstream.avail_in, ctx->zstream.avail_out,
rc);
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"gzip in_buf:" PTR_FMT " pos:" PTR_FMT,
ctx->in_buf, ctx->in_buf->pos);
if (ctx->zstream.next_in) {
ctx->in_buf->pos = ctx->zstream.next_in;
if (ctx->zstream.avail_in == 0) {
ctx->zstream.next_in = NULL;
}
}
ctx->out_buf->last = ctx->zstream.next_out;
if (ctx->zstream.avail_out == 0) {
ngx_alloc_link_and_set_buf(cl, ctx->out_buf, r->pool,
ngx_http_gzip_error(ctx));
*ctx->last_out = cl;
ctx->last_out = &cl->next;
ctx->redo = 1;
continue;
}
ctx->redo = 0;
if (ctx->flush == Z_SYNC_FLUSH) {
ctx->out_buf->flush = 0;
ctx->flush = Z_NO_FLUSH;
ngx_alloc_link_and_set_buf(cl, ctx->out_buf, r->pool,
ngx_http_gzip_error(ctx));
*ctx->last_out = cl;
ctx->last_out = &cl->next;
ctx->pass = 1;
break;
}
if (rc == Z_STREAM_END) {
ctx->zin = ctx->zstream.total_in;
ctx->zout = 10 + ctx->zstream.total_out + 8;
rc = deflateEnd(&ctx->zstream);
if (rc != Z_OK) {
ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
"deflateEnd() failed: %d", rc);
return ngx_http_gzip_error(ctx);
}
ngx_pfree(r->pool, ctx->preallocated);
ngx_alloc_link_and_set_buf(cl, ctx->out_buf, r->pool,
ngx_http_gzip_error(ctx));
*ctx->last_out = cl;
ctx->last_out = &cl->next;
if (ctx->zstream.avail_out >= 8) {
trailer = (struct gztrailer *) ctx->out_buf->last;
ctx->out_buf->last += 8;
ctx->out_buf->last_buf = 1;
} else {
ngx_test_null(b, ngx_create_temp_buf(r->pool, 8),
ngx_http_gzip_error(ctx));
b->last_buf = 1;
ngx_alloc_link_and_set_buf(cl, b, r->pool,
ngx_http_gzip_error(ctx));
*ctx->last_out = cl;
ctx->last_out = &cl->next;
trailer = (struct gztrailer *) b->pos;
b->last += 8;
}
#if (HAVE_LITTLE_ENDIAN)
trailer->crc32 = ctx->crc32;
trailer->zlen = ctx->zin;
#else
trailer->crc32[0] = ctx->crc32 & 0xff;
trailer->crc32[1] = (ctx->crc32 >> 8) & 0xff;
trailer->crc32[2] = (ctx->crc32 >> 16) & 0xff;
trailer->crc32[3] = (ctx->crc32 >> 24) & 0xff;
trailer->zlen[0] = ctx->zin & 0xff;
trailer->zlen[1] = (ctx->zin >> 8) & 0xff;
trailer->zlen[2] = (ctx->zin >> 16) & 0xff;
trailer->zlen[3] = (ctx->zin >> 24) & 0xff;
#endif
ctx->zstream.avail_in = 0;
ctx->zstream.avail_out = 0;
ctx->done = 1;
ctx->pass = 1;
break;
}
if (conf->no_buffer && ctx->in == NULL) {
ngx_alloc_link_and_set_buf(cl, ctx->out_buf, r->pool,
ngx_http_gzip_error(ctx));
*ctx->last_out = cl;
ctx->last_out = &cl->next;
ctx->pass = 1;
break;
}
}
if (ctx->out) {
if (ctx->pass) {
ctx->pass = 0;
} else if (last == NGX_AGAIN) {
return last;
}
} else if (ctx->blocked) {
if (last != NGX_NONE) {
return last;
}
} else {
if (last == NGX_NONE) {
return NGX_OK;
}
return last;
}
last = ngx_http_next_body_filter(r, ctx->out);
if (last == NGX_ERROR) {
return ngx_http_gzip_error(ctx);
}
ngx_chain_update_chains(&ctx->free, &ctx->busy, &ctx->out,
(ngx_buf_tag_t) &ngx_http_gzip_filter_module);
ctx->last_out = &ctx->out;
if (ctx->done) {
return last;
}
}
}
static void *ngx_http_gzip_filter_alloc(void *opaque, u_int items, u_int size)
{
ngx_http_gzip_ctx_t *ctx = opaque;
void *p;
ngx_uint_t alloc;
alloc = items * size;
if (alloc % 512 != 0) {
/*
* allocate the zlib deflate_state, it takes about 6K on x86,
* we allocate 8K
*/
alloc = (alloc + ngx_pagesize - 1) & ~(ngx_pagesize - 1);
}
if (alloc <= ctx->allocated) {
p = ctx->free_mem;
ctx->free_mem += alloc;
ctx->allocated -= alloc;
ngx_log_debug4(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0,
"gzip alloc: n:%d s:%d a:%d p:" PTR_FMT,
items, size, alloc, p);
return p;
}
ngx_log_error(NGX_LOG_ALERT, ctx->request->connection->log, 0,
"gzip filter failed to use preallocated memory: %d of %d",
items * size, ctx->allocated);
p = ngx_palloc(ctx->request->pool, items * size);
return p;
}
static void ngx_http_gzip_filter_free(void *opaque, void *address)
{
#if 0
ngx_http_gzip_ctx_t *ctx = opaque;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0,
"gzip free: %X", address);
#endif
}
static u_char *ngx_http_gzip_log_ratio(ngx_http_request_t *r, u_char *buf,
uintptr_t data)
{
ngx_uint_t zint, zfrac;
ngx_http_gzip_ctx_t *ctx;
ctx = ngx_http_get_module_ctx(r, ngx_http_gzip_filter_module);
if (ctx == NULL || ctx->zout == 0) {
*buf = '-';
return buf + 1;
}
#if 0
return buf + ngx_snprintf((char *) buf, NGX_INT32_LEN + 4, "%.2f",
(float) ctx->zin / ctx->zout);
#endif
/* we prefer do not use FPU */
zint = (ngx_uint_t) (ctx->zin / ctx->zout);
zfrac = (ngx_uint_t) ((ctx->zin * 100 / ctx->zout) % 100);
if ((ctx->zin * 1000 / ctx->zout) %10 > 4) {
if (++zfrac > 99) {
zint++;
zfrac = 0;
}
}
return buf + ngx_snprintf((char *) buf, NGX_INT32_LEN + 4,
"%" NGX_UINT_T_FMT ".%02" NGX_UINT_T_FMT,
zint, zfrac);
}
ngx_inline static int ngx_http_gzip_error(ngx_http_gzip_ctx_t *ctx)
{
deflateEnd(&ctx->zstream);
ngx_pfree(ctx->request->pool, ctx->preallocated);
ctx->zstream.avail_in = 0;
ctx->zstream.avail_out = 0;
ctx->done = 1;
return NGX_ERROR;
}
static ngx_int_t ngx_http_gzip_pre_conf(ngx_conf_t *cf)
{
ngx_http_log_op_name_t *op;
for (op = ngx_http_gzip_log_fmt_ops; op->name.len; op++) { /* void */ }
op->op = NULL;
op = ngx_http_log_fmt_ops;
for (op = ngx_http_log_fmt_ops; op->op; op++) {
if (op->name.len == 0) {
op = (ngx_http_log_op_name_t *) op->op;
}
}
op->op = (ngx_http_log_op_pt) ngx_http_gzip_log_fmt_ops;
return NGX_OK;
}
static ngx_int_t ngx_http_gzip_filter_init(ngx_cycle_t *cycle)
{
ngx_http_next_header_filter = ngx_http_top_header_filter;
ngx_http_top_header_filter = ngx_http_gzip_header_filter;
ngx_http_next_body_filter = ngx_http_top_body_filter;
ngx_http_top_body_filter = ngx_http_gzip_body_filter;
return NGX_OK;
}
static void *ngx_http_gzip_create_conf(ngx_conf_t *cf)
{
ngx_http_gzip_conf_t *conf;
ngx_test_null(conf,
ngx_pcalloc(cf->pool, sizeof(ngx_http_gzip_conf_t)),
NGX_CONF_ERROR);
/* set by ngx_pcalloc():
conf->bufs.num = 0;
conf->proxied = 0;
*/
conf->enable = NGX_CONF_UNSET;
conf->no_buffer = NGX_CONF_UNSET;
conf->http_version = NGX_CONF_UNSET_UINT;
conf->level = NGX_CONF_UNSET;
conf->wbits = (size_t) NGX_CONF_UNSET;
conf->memlevel = (size_t) NGX_CONF_UNSET;
conf->min_length = NGX_CONF_UNSET;
return conf;
}
static char *ngx_http_gzip_merge_conf(ngx_conf_t *cf,
void *parent, void *child)
{
ngx_http_gzip_conf_t *prev = parent;
ngx_http_gzip_conf_t *conf = child;
ngx_conf_merge_value(conf->enable, prev->enable, 0);
ngx_conf_merge_bufs_value(conf->bufs, prev->bufs, 4, ngx_pagesize);
ngx_conf_merge_unsigned_value(conf->http_version, prev->http_version,
NGX_HTTP_VERSION_11);
ngx_conf_merge_bitmask_value(conf->proxied, prev->proxied,
(NGX_CONF_BITMASK_SET
|NGX_HTTP_GZIP_PROXIED_OFF));
ngx_conf_merge_value(conf->level, prev->level, 1);
ngx_conf_merge_size_value(conf->wbits, prev->wbits, MAX_WBITS);
ngx_conf_merge_size_value(conf->memlevel, prev->memlevel,
MAX_MEM_LEVEL - 1);
ngx_conf_merge_value(conf->min_length, prev->min_length, 0);
ngx_conf_merge_value(conf->no_buffer, prev->no_buffer, 0);
return NGX_CONF_OK;
}
static char *ngx_http_gzip_set_window(ngx_conf_t *cf, void *post, void *data)
{
int *np = data;
int wbits, wsize;
ngx_conf_log_error(NGX_LOG_INFO, cf, 0, "WBITS: %d", *np);
wbits = 15;
for (wsize = 32 * 1024; wsize > 256; wsize >>= 1) {
if (wsize == *np) {
*np = wbits;
ngx_conf_log_error(NGX_LOG_INFO, cf, 0, "WBITS: %d", *np);
return NULL;
}
wbits--;
}
return "must be 512, 1k, 2k, 4k, 8k, 16k, or 32k";
}
static char *ngx_http_gzip_set_hash(ngx_conf_t *cf, void *post, void *data)
{
int *np = data;
int memlevel, hsize;
ngx_conf_log_error(NGX_LOG_INFO, cf, 0, "MEMLEVEL: %d", *np);
memlevel = 9;
for (hsize = 128 * 1024; hsize > 256; hsize >>= 1) {
if (hsize == *np) {
*np = memlevel;
ngx_conf_log_error(NGX_LOG_INFO, cf, 0, "MEMLEVEL: %d", *np);
return NULL;
}
memlevel--;
}
return "must be 512, 1k, 2k, 4k, 8k, 16k, 32k, 64k, or 128k";
}
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