/* * Copyright (C) Igor Sysoev */ #include #include #include #define NGX_NONE 1 ngx_inline static ngx_int_t ngx_output_chain_need_to_copy(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf); static ngx_int_t ngx_output_chain_copy_buf(ngx_buf_t *dst, ngx_buf_t *src, ngx_uint_t sendfile); ngx_int_t ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in) { int rc, last; size_t size, bsize; ngx_chain_t *cl, *out, **last_out; /* * the short path for the case when the ctx->in chain is empty * and the incoming chain is empty too or it has the single buf * that does not require the copy */ if (ctx->in == NULL) { if (in == NULL) { return ctx->output_filter(ctx->filter_ctx, in); } if (in->next == NULL && (!ngx_output_chain_need_to_copy(ctx, in->buf))) { return ctx->output_filter(ctx->filter_ctx, in); } } /* add the incoming buf to the chain ctx->in */ if (in) { if (ngx_chain_add_copy(ctx->pool, &ctx->in, in) == NGX_ERROR) { return NGX_ERROR; } } last = NGX_NONE; out = NULL; last_out = &out; for ( ;; ) { while (ctx->in) { /* * cycle while there are the ctx->in bufs * or there are the free output bufs to copy in */ bsize = ngx_buf_size(ctx->in->buf); if (bsize == 0 && !ngx_buf_special(ctx->in->buf)) { ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0, "zero size buf"); ctx->in = ctx->in->next; continue; } if (!ngx_output_chain_need_to_copy(ctx, ctx->in->buf)) { /* move the chain link to the output chain */ cl = ctx->in; ctx->in = cl->next; *last_out = cl; last_out = &cl->next; cl->next = NULL; continue; } if (ctx->buf == NULL) { /* get the free buf */ if (ctx->free) { ctx->buf = ctx->free->buf; ctx->free = ctx->free->next; } else if (out || ctx->allocated == ctx->bufs.num) { break; } else { size = ctx->bufs.size; if (ctx->in->buf->last_buf) { if (bsize < ctx->bufs.size) { /* * allocate small temp buf for the small last buf * or its small last part */ size = bsize; } else if (ctx->bufs.num == 1 && (bsize < ctx->bufs.size + (ctx->bufs.size >> 2))) { /* * allocate a temp buf that equals * to the last buf if the last buf size is lesser * than 1.25 of bufs.size and a temp buf is single */ size = bsize; } } if (!(ctx->buf = ngx_create_temp_buf(ctx->pool, size))) { return NGX_ERROR; } ctx->buf->tag = ctx->tag; ctx->buf->recycled = 1; ctx->allocated++; } } rc = ngx_output_chain_copy_buf(ctx->buf, ctx->in->buf, ctx->sendfile); if (rc == NGX_ERROR) { return rc; } if (rc == NGX_AGAIN) { if (out) { break; } return rc; } /* delete the completed buf from the ctx->in chain */ if (ngx_buf_size(ctx->in->buf) == 0) { ctx->in = ctx->in->next; } ngx_alloc_link_and_set_buf(cl, ctx->buf, ctx->pool, NGX_ERROR); *last_out = cl; last_out = &cl->next; ctx->buf = NULL; } if (out == NULL && last != NGX_NONE) { return last; } last = ctx->output_filter(ctx->filter_ctx, out); ngx_chain_update_chains(&ctx->free, &ctx->busy, &out, ctx->tag); last_out = &out; if (last == NGX_ERROR) { return last; } } } ngx_inline static ngx_int_t ngx_output_chain_need_to_copy(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf) { if (ngx_buf_special(buf)) { return 0; } if (!ctx->sendfile) { if (!ngx_buf_in_memory(buf)) { return 1; } buf->in_file = 0; } if (ctx->need_in_memory && !ngx_buf_in_memory(buf)) { return 1; } if (ctx->need_in_temp && (buf->memory || buf->mmap)) { return 1; } return 0; } static ngx_int_t ngx_output_chain_copy_buf(ngx_buf_t *dst, ngx_buf_t *src, ngx_uint_t sendfile) { size_t size; ssize_t n; size = ngx_buf_size(src); if (size > (size_t) (dst->end - dst->pos)) { size = dst->end - dst->pos; } if (ngx_buf_in_memory(src)) { ngx_memcpy(dst->pos, src->pos, size); src->pos += size; dst->last += size; if (src->in_file && sendfile) { dst->in_file = 1; dst->file = src->file; dst->file_pos = src->file_pos; src->file_pos += size; dst->file_last = src->file_pos; } else { dst->in_file = 0; } if (src->last_buf && src->pos == src->last) { dst->last_buf = 1; } } else { n = ngx_read_file(src->file, dst->pos, size, src->file_pos); if (n == NGX_ERROR) { return n; } #if (NGX_FILE_AIO_READ) if (n == NGX_AGAIN) { return n; } #endif if ((size_t) n != size) { ngx_log_error(NGX_LOG_ALERT, src->file->log, 0, ngx_read_file_n " reads only %d of %d from file", n, size); if (n == 0) { return NGX_ERROR; } } dst->last += n; if (sendfile) { dst->in_file = 1; dst->file = src->file; dst->file_pos = src->file_pos; src->file_pos += size; dst->file_last = src->file_pos; } else { dst->in_file = 0; src->file_pos += n; } if (src->last_buf && src->file_pos == src->file_last) { dst->last_buf = 1; } } return NGX_OK; } ngx_int_t ngx_chain_writer(void *data, ngx_chain_t *in) { ngx_chain_writer_ctx_t *ctx = data; ngx_chain_t *cl; for (/* void */; in; in = in->next) { ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0, "WRITER buf: %d", ngx_buf_size(in->buf)); ngx_alloc_link_and_set_buf(cl, in->buf, ctx->pool, NGX_ERROR); *ctx->last = cl; ctx->last = &cl->next; } ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0, "WRITER0: %X", ctx->out); ctx->out = ngx_send_chain(ctx->connection, ctx->out, ctx->limit); ngx_log_debug1(NGX_LOG_DEBUG_CORE, ctx->connection->log, 0, "WRITER1: %X", ctx->out); if (ctx->out == NGX_CHAIN_ERROR) { return NGX_ERROR; } if (ctx->out == NULL) { ctx->last = &ctx->out; return NGX_OK; } return NGX_AGAIN; }