diff options
Diffstat (limited to 'app/nginx/src/http/modules/ngx_http_gzip_filter_module.c')
| -rw-r--r-- | app/nginx/src/http/modules/ngx_http_gzip_filter_module.c | 1245 |
1 files changed, 1245 insertions, 0 deletions
diff --git a/app/nginx/src/http/modules/ngx_http_gzip_filter_module.c b/app/nginx/src/http/modules/ngx_http_gzip_filter_module.c new file mode 100644 index 0000000..f9652d0 --- /dev/null +++ b/app/nginx/src/http/modules/ngx_http_gzip_filter_module.c @@ -0,0 +1,1245 @@ + +/* + * Copyright (C) Igor Sysoev + * Copyright (C) Nginx, Inc. + */ + + +#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_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_weak_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_uint_t flush; + 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) { + + /* 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; + flush = 0; + + } else { + flush = ctx->busy ? 1 : 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 && !flush) { + 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; + flush = 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) +{ + ngx_chain_t *cl; + + 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; + } + + cl = ctx->in; + ctx->in_buf = cl->buf; + ctx->in = cl->next; + + if (ctx->in_buf->tag == (ngx_buf_tag_t) &ngx_http_gzip_filter_module) { + ctx->copy_buf = cl; + + } else { + ngx_free_chain(r->pool, cl); + } + + 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_chain_t *cl; + 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) { + + cl = ctx->free; + ctx->out_buf = cl->buf; + ctx->free = cl->next; + + ngx_free_chain(r->pool, cl); + + } 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:%ui 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 %ui", + 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"; +} |