/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include #include #include #include typedef struct { ngx_flag_t enable; ngx_flag_t no_buffer; ngx_hash_t types; ngx_bufs_t bufs; size_t postpone_gzipping; ngx_int_t level; size_t wbits; size_t memlevel; ssize_t min_length; ngx_array_t *types_keys; } ngx_http_gzip_conf_t; typedef struct { ngx_chain_t *in; ngx_chain_t *free; ngx_chain_t *busy; ngx_chain_t *out; ngx_chain_t **last_out; ngx_chain_t *copied; ngx_chain_t *copy_buf; ngx_buf_t *in_buf; ngx_buf_t *out_buf; ngx_int_t bufs; void *preallocated; char *free_mem; ngx_uint_t allocated; int wbits; int memlevel; unsigned flush:4; unsigned redo:1; unsigned done:1; unsigned nomem:1; unsigned gzheader:1; unsigned buffering:1; size_t zin; size_t zout; uint32_t crc32; z_stream zstream; ngx_http_request_t *request; } ngx_http_gzip_ctx_t; #if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED) struct gztrailer { uint32_t crc32; uint32_t zlen; }; #else /* NGX_HAVE_BIG_ENDIAN || !NGX_HAVE_NONALIGNED */ struct gztrailer { u_char crc32[4]; u_char zlen[4]; }; #endif static void ngx_http_gzip_filter_memory(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx); static ngx_int_t ngx_http_gzip_filter_buffer(ngx_http_gzip_ctx_t *ctx, ngx_chain_t *in); static ngx_int_t ngx_http_gzip_filter_deflate_start(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx); static ngx_int_t ngx_http_gzip_filter_gzheader(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx); static ngx_int_t ngx_http_gzip_filter_add_data(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx); static ngx_int_t ngx_http_gzip_filter_get_buf(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx); static ngx_int_t ngx_http_gzip_filter_deflate(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx); static ngx_int_t ngx_http_gzip_filter_deflate_end(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx); 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); static void ngx_http_gzip_filter_free_copy_buf(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx); static ngx_int_t ngx_http_gzip_add_variables(ngx_conf_t *cf); static ngx_int_t ngx_http_gzip_ratio_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data); static ngx_int_t ngx_http_gzip_filter_init(ngx_conf_t *cf); 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_window(ngx_conf_t *cf, void *post, void *data); static char *ngx_http_gzip_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_window_p = ngx_http_gzip_window; static ngx_conf_post_handler_pt ngx_http_gzip_hash_p = ngx_http_gzip_hash; 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_HTTP_LIF_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_types"), NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE, ngx_http_types_slot, NGX_HTTP_LOC_CONF_OFFSET, offsetof(ngx_http_gzip_conf_t, types_keys), &ngx_http_html_default_types[0] }, { 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_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_hash_p }, { ngx_string("postpone_gzipping"), 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, postpone_gzipping), NULL }, { 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_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_add_variables, /* preconfiguration */ ngx_http_gzip_filter_init, /* postconfiguration */ 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_V1, &ngx_http_gzip_filter_module_ctx, /* module context */ ngx_http_gzip_filter_commands, /* module directives */ NGX_HTTP_MODULE, /* module type */ NULL, /* init master */ NULL, /* init module */ NULL, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ NULL, /* exit process */ NULL, /* exit master */ NGX_MODULE_V1_PADDING }; static ngx_str_t ngx_http_gzip_ratio = ngx_string("gzip_ratio"); 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_table_elt_t *h; 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->headers_out.status != NGX_HTTP_FORBIDDEN && r->headers_out.status != NGX_HTTP_NOT_FOUND) || (r->headers_out.content_encoding && r->headers_out.content_encoding->value.len) || (r->headers_out.content_length_n != -1 && r->headers_out.content_length_n < conf->min_length) || ngx_http_test_content_type(r, &conf->types) == NULL || r->header_only) { return ngx_http_next_header_filter(r); } r->gzip_vary = 1; #if (NGX_HTTP_DEGRADATION) { ngx_http_core_loc_conf_t *clcf; clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); if (clcf->gzip_disable_degradation && ngx_http_degraded(r)) { return ngx_http_next_header_filter(r); } } #endif if (!r->gzip_tested) { if (ngx_http_gzip_ok(r) != NGX_OK) { return ngx_http_next_header_filter(r); } } else if (!r->gzip_ok) { return ngx_http_next_header_filter(r); } ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_gzip_ctx_t)); if (ctx == NULL) { return NGX_ERROR; } ngx_http_set_ctx(r, ctx, ngx_http_gzip_filter_module); ctx->request = r; ctx->buffering = (conf->postpone_gzipping != 0); ngx_http_gzip_filter_memory(r, ctx); h = ngx_list_push(&r->headers_out.headers); if (h == NULL) { return NGX_ERROR; } h->hash = 1; ngx_str_set(&h->key, "Content-Encoding"); ngx_str_set(&h->value, "gzip"); r->headers_out.content_encoding = h; r->main_filter_need_in_memory = 1; ngx_http_clear_content_length(r); ngx_http_clear_accept_ranges(r); ngx_http_clear_etag(r); return ngx_http_next_header_filter(r); } static ngx_int_t ngx_http_gzip_body_filter(ngx_http_request_t *r, ngx_chain_t *in) { int rc; ngx_chain_t *cl; ngx_http_gzip_ctx_t *ctx; ctx = ngx_http_get_module_ctx(r, ngx_http_gzip_filter_module); if (ctx == NULL || ctx->done || r->header_only) { return ngx_http_next_body_filter(r, in); } ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http gzip filter"); if (ctx->buffering) { /* * With default memory settings zlib starts to output gzipped data * only after it has got about 90K, so it makes sense to allocate * zlib memory (200-400K) only after we have enough data to compress. * Although we copy buffers, nevertheless for not big responses * this allows to allocate zlib memory, to compress and to output * the response in one step using hot CPU cache. */ if (in) { switch (ngx_http_gzip_filter_buffer(ctx, in)) { case NGX_OK: return NGX_OK; case NGX_DONE: in = NULL; break; default: /* NGX_ERROR */ goto failed; } } else { ctx->buffering = 0; } } if (ctx->preallocated == NULL) { if (ngx_http_gzip_filter_deflate_start(r, ctx) != NGX_OK) { goto failed; } } if (in) { if (ngx_chain_add_copy(r->pool, &ctx->in, in) != NGX_OK) { goto failed; } r->connection->buffered |= NGX_HTTP_GZIP_BUFFERED; } if (ctx->nomem || in == NULL) { /* flush busy buffers */ if (ngx_http_next_body_filter(r, NULL) == NGX_ERROR) { goto failed; } cl = NULL; ngx_chain_update_chains(r->pool, &ctx->free, &ctx->busy, &cl, (ngx_buf_tag_t) &ngx_http_gzip_filter_module); ctx->nomem = 0; } for ( ;; ) { /* cycle while we can write to a client */ for ( ;; ) { /* cycle while there is data to feed zlib and ... */ rc = ngx_http_gzip_filter_add_data(r, ctx); if (rc == NGX_DECLINED) { break; } if (rc == NGX_AGAIN) { continue; } /* ... there are buffers to write zlib output */ rc = ngx_http_gzip_filter_get_buf(r, ctx); if (rc == NGX_DECLINED) { break; } if (rc == NGX_ERROR) { goto failed; } rc = ngx_http_gzip_filter_deflate(r, ctx); if (rc == NGX_OK) { break; } if (rc == NGX_ERROR) { goto failed; } /* rc == NGX_AGAIN */ } if (ctx->out == NULL) { ngx_http_gzip_filter_free_copy_buf(r, ctx); return ctx->busy ? NGX_AGAIN : NGX_OK; } if (!ctx->gzheader) { if (ngx_http_gzip_filter_gzheader(r, ctx) != NGX_OK) { goto failed; } } rc = ngx_http_next_body_filter(r, ctx->out); if (rc == NGX_ERROR) { goto failed; } ngx_http_gzip_filter_free_copy_buf(r, ctx); ngx_chain_update_chains(r->pool, &ctx->free, &ctx->busy, &ctx->out, (ngx_buf_tag_t) &ngx_http_gzip_filter_module); ctx->last_out = &ctx->out; ctx->nomem = 0; if (ctx->done) { return rc; } } /* unreachable */ failed: ctx->done = 1; if (ctx->preallocated) { deflateEnd(&ctx->zstream); ngx_pfree(r->pool, ctx->preallocated); } ngx_http_gzip_filter_free_copy_buf(r, ctx); return NGX_ERROR; } static void ngx_http_gzip_filter_memory(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx) { int wbits, memlevel; ngx_http_gzip_conf_t *conf; conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module); wbits = conf->wbits; memlevel = conf->memlevel; if (r->headers_out.content_length_n > 0) { /* the actual zlib window size is smaller by 262 bytes */ while (r->headers_out.content_length_n < ((1 << (wbits - 1)) - 262)) { wbits--; memlevel--; } if (memlevel < 1) { memlevel = 1; } } ctx->wbits = wbits; ctx->memlevel = memlevel; /* * We preallocate a memory for zlib in one buffer (200K-400K), this * decreases a number of malloc() and free() calls and also probably * decreases a number of syscalls (sbrk()/mmap() and so on). * Besides we free the memory as soon as a gzipping will complete * and do not wait while a whole response will be sent to a client. * * 8K is for zlib deflate_state, it takes * *) 5816 bytes on i386 and sparc64 (32-bit mode) * *) 5920 bytes on amd64 and sparc64 */ ctx->allocated = 8192 + (1 << (wbits + 2)) + (1 << (memlevel + 9)); } static ngx_int_t ngx_http_gzip_filter_buffer(ngx_http_gzip_ctx_t *ctx, ngx_chain_t *in) { size_t size, buffered; ngx_buf_t *b, *buf; ngx_chain_t *cl, **ll; ngx_http_request_t *r; ngx_http_gzip_conf_t *conf; r = ctx->request; r->connection->buffered |= NGX_HTTP_GZIP_BUFFERED; buffered = 0; ll = &ctx->in; for (cl = ctx->in; cl; cl = cl->next) { buffered += cl->buf->last - cl->buf->pos; ll = &cl->next; } conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module); while (in) { cl = ngx_alloc_chain_link(r->pool); if (cl == NULL) { return NGX_ERROR; } b = in->buf; size = b->last - b->pos; buffered += size; if (b->flush || b->last_buf || buffered > conf->postpone_gzipping) { ctx->buffering = 0; } if (ctx->buffering && size) { buf = ngx_create_temp_buf(r->pool, size); if (buf == NULL) { return NGX_ERROR; } buf->last = ngx_cpymem(buf->pos, b->pos, size); b->pos = b->last; buf->last_buf = b->last_buf; buf->tag = (ngx_buf_tag_t) &ngx_http_gzip_filter_module; cl->buf = buf; } else { cl->buf = b; } *ll = cl; ll = &cl->next; in = in->next; } *ll = NULL; return ctx->buffering ? NGX_OK : NGX_DONE; } static ngx_int_t ngx_http_gzip_filter_deflate_start(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx) { int rc; ngx_http_gzip_conf_t *conf; conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module); ctx->preallocated = ngx_palloc(r->pool, ctx->allocated); if (ctx->preallocated == NULL) { return 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, (int) conf->level, Z_DEFLATED, - ctx->wbits, ctx->memlevel, Z_DEFAULT_STRATEGY); if (rc != Z_OK) { ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, "deflateInit2() failed: %d", rc); return NGX_ERROR; } ctx->last_out = &ctx->out; ctx->crc32 = crc32(0L, Z_NULL, 0); ctx->flush = Z_NO_FLUSH; return NGX_OK; } static ngx_int_t ngx_http_gzip_filter_gzheader(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx) { ngx_buf_t *b; ngx_chain_t *cl; static u_char gzheader[10] = { 0x1f, 0x8b, Z_DEFLATED, 0, 0, 0, 0, 0, 0, 3 }; b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t)); if (b == NULL) { return NGX_ERROR; } b->memory = 1; b->pos = gzheader; b->last = b->pos + 10; cl = ngx_alloc_chain_link(r->pool); if (cl == NULL) { return NGX_ERROR; } cl->buf = b; cl->next = ctx->out; ctx->out = cl; ctx->gzheader = 1; return NGX_OK; } static ngx_int_t ngx_http_gzip_filter_add_data(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx) { if (ctx->zstream.avail_in || ctx->flush != Z_NO_FLUSH || ctx->redo) { return NGX_OK; } ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "gzip in: %p", ctx->in); if (ctx->in == NULL) { return NGX_DECLINED; } if (ctx->copy_buf) { /* * to avoid CPU cache trashing we do not free() just quit buf, * but postpone free()ing after zlib compressing and data output */ ctx->copy_buf->next = ctx->copied; ctx->copied = ctx->copy_buf; ctx->copy_buf = NULL; } ctx->in_buf = ctx->in->buf; if (ctx->in_buf->tag == (ngx_buf_tag_t) &ngx_http_gzip_filter_module) { ctx->copy_buf = ctx->in; } 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:%p ni:%p ai:%ud", ctx->in_buf, ctx->zstream.next_in, ctx->zstream.avail_in); 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) { ctx->crc32 = crc32(ctx->crc32, ctx->zstream.next_in, ctx->zstream.avail_in); } else if (ctx->flush == Z_NO_FLUSH) { return NGX_AGAIN; } return NGX_OK; } static ngx_int_t ngx_http_gzip_filter_get_buf(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx) { ngx_http_gzip_conf_t *conf; if (ctx->zstream.avail_out) { return NGX_OK; } conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module); if (ctx->free) { ctx->out_buf = ctx->free->buf; ctx->free = ctx->free->next; } else if (ctx->bufs < conf->bufs.num) { ctx->out_buf = ngx_create_temp_buf(r->pool, conf->bufs.size); if (ctx->out_buf == NULL) { return NGX_ERROR; } ctx->out_buf->tag = (ngx_buf_tag_t) &ngx_http_gzip_filter_module; ctx->out_buf->recycled = 1; ctx->bufs++; } else { ctx->nomem = 1; return NGX_DECLINED; } ctx->zstream.next_out = ctx->out_buf->pos; ctx->zstream.avail_out = conf->bufs.size; return NGX_OK; } static ngx_int_t ngx_http_gzip_filter_deflate(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx) { int rc; ngx_buf_t *b; ngx_chain_t *cl; ngx_http_gzip_conf_t *conf; ngx_log_debug6(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "deflate in: ni:%p no:%p ai:%ud ao:%ud 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 && rc != Z_BUF_ERROR) { ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0, "deflate() failed: %d, %d", ctx->flush, rc); return NGX_ERROR; } ngx_log_debug5(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "deflate out: ni:%p no:%p ai:%ud ao:%ud 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:%p pos:%p", 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) { /* zlib wants to output some more gzipped data */ cl = ngx_alloc_chain_link(r->pool); if (cl == NULL) { return NGX_ERROR; } cl->buf = ctx->out_buf; cl->next = NULL; *ctx->last_out = cl; ctx->last_out = &cl->next; ctx->redo = 1; return NGX_AGAIN; } ctx->redo = 0; if (ctx->flush == Z_SYNC_FLUSH) { ctx->flush = Z_NO_FLUSH; cl = ngx_alloc_chain_link(r->pool); if (cl == NULL) { return NGX_ERROR; } b = ctx->out_buf; if (ngx_buf_size(b) == 0) { b = ngx_calloc_buf(ctx->request->pool); if (b == NULL) { return NGX_ERROR; } } else { ctx->zstream.avail_out = 0; } b->flush = 1; cl->buf = b; cl->next = NULL; *ctx->last_out = cl; ctx->last_out = &cl->next; r->connection->buffered &= ~NGX_HTTP_GZIP_BUFFERED; return NGX_OK; } if (rc == Z_STREAM_END) { if (ngx_http_gzip_filter_deflate_end(r, ctx) != NGX_OK) { return NGX_ERROR; } return NGX_OK; } conf = ngx_http_get_module_loc_conf(r, ngx_http_gzip_filter_module); if (conf->no_buffer && ctx->in == NULL) { cl = ngx_alloc_chain_link(r->pool); if (cl == NULL) { return NGX_ERROR; } cl->buf = ctx->out_buf; cl->next = NULL; *ctx->last_out = cl; ctx->last_out = &cl->next; return NGX_OK; } return NGX_AGAIN; } static ngx_int_t ngx_http_gzip_filter_deflate_end(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx) { int rc; ngx_buf_t *b; ngx_chain_t *cl; struct gztrailer *trailer; 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_ERROR; } ngx_pfree(r->pool, ctx->preallocated); cl = ngx_alloc_chain_link(r->pool); if (cl == NULL) { return NGX_ERROR; } cl->buf = ctx->out_buf; cl->next = NULL; *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 { b = ngx_create_temp_buf(r->pool, 8); if (b == NULL) { return NGX_ERROR; } b->last_buf = 1; cl = ngx_alloc_chain_link(r->pool); if (cl == NULL) { return NGX_ERROR; } cl->buf = b; cl->next = NULL; *ctx->last_out = cl; ctx->last_out = &cl->next; trailer = (struct gztrailer *) b->pos; b->last += 8; } #if (NGX_HAVE_LITTLE_ENDIAN && NGX_HAVE_NONALIGNED) trailer->crc32 = ctx->crc32; trailer->zlen = ctx->zin; #else trailer->crc32[0] = (u_char) (ctx->crc32 & 0xff); trailer->crc32[1] = (u_char) ((ctx->crc32 >> 8) & 0xff); trailer->crc32[2] = (u_char) ((ctx->crc32 >> 16) & 0xff); trailer->crc32[3] = (u_char) ((ctx->crc32 >> 24) & 0xff); trailer->zlen[0] = (u_char) (ctx->zin & 0xff); trailer->zlen[1] = (u_char) ((ctx->zin >> 8) & 0xff); trailer->zlen[2] = (u_char) ((ctx->zin >> 16) & 0xff); trailer->zlen[3] = (u_char) ((ctx->zin >> 24) & 0xff); #endif ctx->zstream.avail_in = 0; ctx->zstream.avail_out = 0; ctx->done = 1; r->connection->buffered &= ~NGX_HTTP_GZIP_BUFFERED; return NGX_OK; } 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 && alloc < 8192) { /* * The zlib deflate_state allocation, it takes about 6K, * we allocate 8K. Other allocations are divisible by 512. */ alloc = 8192; } 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:%ud s:%ud a:%ud p:%p", items, size, alloc, p); return p; } ngx_log_error(NGX_LOG_ALERT, ctx->request->connection->log, 0, "gzip filter failed to use preallocated memory: %ud of %ud", 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: %p", address); #endif } static void ngx_http_gzip_filter_free_copy_buf(ngx_http_request_t *r, ngx_http_gzip_ctx_t *ctx) { ngx_chain_t *cl; for (cl = ctx->copied; cl; cl = cl->next) { ngx_pfree(r->pool, cl->buf->start); } ctx->copied = NULL; } static ngx_int_t ngx_http_gzip_add_variables(ngx_conf_t *cf) { ngx_http_variable_t *var; var = ngx_http_add_variable(cf, &ngx_http_gzip_ratio, NGX_HTTP_VAR_NOHASH); if (var == NULL) { return NGX_ERROR; } var->get_handler = ngx_http_gzip_ratio_variable; return NGX_OK; } static ngx_int_t ngx_http_gzip_ratio_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data) { ngx_uint_t zint, zfrac; ngx_http_gzip_ctx_t *ctx; v->valid = 1; v->no_cacheable = 0; v->not_found = 0; ctx = ngx_http_get_module_ctx(r, ngx_http_gzip_filter_module); if (ctx == NULL || ctx->zout == 0) { v->not_found = 1; return NGX_OK; } v->data = ngx_pnalloc(r->pool, NGX_INT32_LEN + 3); if (v->data == NULL) { return NGX_ERROR; } 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) { /* the rounding, e.g., 2.125 to 2.13 */ zfrac++; if (zfrac > 99) { zint++; zfrac = 0; } } v->len = ngx_sprintf(v->data, "%ui.%02ui", zint, zfrac) - v->data; return NGX_OK; } static void * ngx_http_gzip_create_conf(ngx_conf_t *cf) { ngx_http_gzip_conf_t *conf; conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_gzip_conf_t)); if (conf == NULL) { return NULL; } /* * set by ngx_pcalloc(): * * conf->bufs.num = 0; * conf->types = { NULL }; * conf->types_keys = NULL; */ conf->enable = NGX_CONF_UNSET; conf->no_buffer = NGX_CONF_UNSET; conf->postpone_gzipping = NGX_CONF_UNSET_SIZE; conf->level = NGX_CONF_UNSET; conf->wbits = NGX_CONF_UNSET_SIZE; conf->memlevel = NGX_CONF_UNSET_SIZE; 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_value(conf->no_buffer, prev->no_buffer, 0); ngx_conf_merge_bufs_value(conf->bufs, prev->bufs, (128 * 1024) / ngx_pagesize, ngx_pagesize); ngx_conf_merge_size_value(conf->postpone_gzipping, prev->postpone_gzipping, 0); 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, 20); if (ngx_http_merge_types(cf, &conf->types_keys, &conf->types, &prev->types_keys, &prev->types, ngx_http_html_default_types) != NGX_OK) { return NGX_CONF_ERROR; } return NGX_CONF_OK; } static ngx_int_t ngx_http_gzip_filter_init(ngx_conf_t *cf) { 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 char * ngx_http_gzip_window(ngx_conf_t *cf, void *post, void *data) { size_t *np = data; size_t wbits, wsize; wbits = 15; for (wsize = 32 * 1024; wsize > 256; wsize >>= 1) { if (wsize == *np) { *np = wbits; return NGX_CONF_OK; } wbits--; } return "must be 512, 1k, 2k, 4k, 8k, 16k, or 32k"; } static char * ngx_http_gzip_hash(ngx_conf_t *cf, void *post, void *data) { size_t *np = data; size_t memlevel, hsize; memlevel = 9; for (hsize = 128 * 1024; hsize > 256; hsize >>= 1) { if (hsize == *np) { *np = memlevel; return NGX_CONF_OK; } memlevel--; } return "must be 512, 1k, 2k, 4k, 8k, 16k, 32k, 64k, or 128k"; }