wget: use FEATURE_COPYBUF_KB-sized buffer. Much faster for local transfers

function                                             old     new   delta
base64enc                                              -      53     +53
gethdr                                               190     200     +10
ftpcmd                                               129     133      +4
progress_meter                                       160     122     -38
retrieve_file_data                                   431     392     -39
base64enc_512                                         46       -     -46
wget_main                                           2456    2220    -236
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 2/3 up/down: 67/-359)          Total: -292 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

2 files changed, 62 insertions, 61 deletions

diff --git a/libbb/Config.src b/libbb/Config.src
index dfb897d5f..18bdc5151 100644
--- a/libbb/Config.src
+++ b/libbb/Config.src
@@ -156,7 +156,7 @@ config FEATURE_COPYBUF_KB
         range 1 1024
         default 4
         help
-          Size of buffer used by cp, mv, install etc.
+          Size of buffer used by cp, mv, install, wget etc.
           Buffers which are 4 kb or less will be allocated on stack.
           Bigger buffers will be allocated with mmap, with fallback to 4 kb
           stack buffer if mmap fails.
diff --git a/networking/wget.c b/networking/wget.c
index 0db9b3365..8e636bd39 100644
--- a/networking/wget.c
+++ b/networking/wget.c
@@ -35,12 +35,16 @@ struct globals {
 #endif
         smallint chunked;         /* chunked transfer encoding */
         smallint got_clen;        /* got content-length: from server  */
+        /* Local downloads do benefit from big buffer.
+         * With 512 byte buffer, it was measured to be
+         * an order of magnitude slower than with big one.
+         */
+        uint64_t just_to_align_next_member;
+        char wget_buf[CONFIG_FEATURE_COPYBUF_KB*1024];
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
-struct BUG_G_too_big {
-        char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
-};
+#define G (*ptr_to_globals)
 #define INIT_G() do { \
+        SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
         IF_FEATURE_WGET_TIMEOUT(G.timeout_seconds = 900;) \
 } while (0)
 
@@ -158,14 +162,14 @@ static char *safe_fgets(char *s, int size, FILE *stream)
 }
 
 #if ENABLE_FEATURE_WGET_AUTHENTICATION
-/* Base64-encode character string. buf is assumed to be char buf[512]. */
-static char *base64enc_512(char buf[512], const char *str)
+/* Base64-encode character string. */
+static char *base64enc(const char *str)
 {
         unsigned len = strlen(str);
-        if (len > 512/4*3 - 10) /* paranoia */
-                len = 512/4*3 - 10;
-        bb_uuencode(buf, str, len, bb_uuenc_tbl_base64);
-        return buf;
+        if (len > sizeof(G.wget_buf)/4*3 - 10) /* paranoia */
+                len = sizeof(G.wget_buf)/4*3 - 10;
+        bb_uuencode(G.wget_buf, str, len, bb_uuenc_tbl_base64);
+        return G.wget_buf;
 }
 #endif
 
@@ -191,7 +195,7 @@ static FILE *open_socket(len_and_sockaddr *lsa)
         return fp;
 }
 
-static int ftpcmd(const char *s1, const char *s2, FILE *fp, char *buf)
+static int ftpcmd(const char *s1, const char *s2, FILE *fp)
 {
         int result;
         if (s1) {
@@ -203,18 +207,18 @@ static int ftpcmd(const char *s1, const char *s2, FILE *fp, char *buf)
         do {
                 char *buf_ptr;
 
-                if (fgets(buf, 510, fp) == NULL) {
+                if (fgets(G.wget_buf, sizeof(G.wget_buf)-2, fp) == NULL) {
                         bb_perror_msg_and_die("error getting response");
                 }
-                buf_ptr = strstr(buf, "\r\n");
+                buf_ptr = strstr(G.wget_buf, "\r\n");
                 if (buf_ptr) {
                         *buf_ptr = '\0';
                 }
-        } while (!isdigit(buf[0]) || buf[3] != ' ');
+        } while (!isdigit(G.wget_buf[0]) || G.wget_buf[3] != ' ');
 
-        buf[3] = '\0';
-        result = xatoi_positive(buf);
-        buf[3] = ' ';
+        G.wget_buf[3] = '\0';
+        result = xatoi_positive(G.wget_buf);
+        G.wget_buf[3] = ' ';
         return result;
 }
 
@@ -278,7 +282,7 @@ static void parse_url(char *src_url, struct host_info *h)
         sp = h->host;
 }
 
-static char *gethdr(char *buf, size_t bufsiz, FILE *fp /*, int *istrunc*/)
+static char *gethdr(FILE *fp /*, int *istrunc*/)
 {
         char *s, *hdrval;
         int c;
@@ -286,24 +290,24 @@ static char *gethdr(char *buf, size_t bufsiz, FILE *fp /*, int *istrunc*/)
         /* *istrunc = 0; */
 
         /* retrieve header line */
-        if (fgets(buf, bufsiz, fp) == NULL)
+        if (fgets(G.wget_buf, sizeof(G.wget_buf), fp) == NULL)
                 return NULL;
 
         /* see if we are at the end of the headers */
-        for (s = buf; *s == '\r'; ++s)
+        for (s = G.wget_buf; *s == '\r'; ++s)
                 continue;
         if (*s == '\n')
                 return NULL;
 
         /* convert the header name to lower case */
-        for (s = buf; isalnum(*s) || *s == '-' || *s == '.'; ++s) {
+        for (s = G.wget_buf; isalnum(*s) || *s == '-' || *s == '.'; ++s) {
                 /* tolower for "A-Z", no-op for "0-9a-z-." */
                 *s = (*s | 0x20);
         }
 
         /* verify we are at the end of the header name */
         if (*s != ':')
-                bb_error_msg_and_die("bad header line: %s", sanitize_string(buf));
+                bb_error_msg_and_die("bad header line: %s", sanitize_string(G.wget_buf));
 
         /* locate the start of the header value */
         *s++ = '\0';
@@ -366,7 +370,6 @@ static char *URL_escape(const char *str)
 
 static FILE* prepare_ftp_session(FILE **dfpp, struct host_info *target, len_and_sockaddr *lsa)
 {
-        char buf[512];
         FILE *sfp;
         char *str;
         int port;
@@ -375,8 +378,8 @@ static FILE* prepare_ftp_session(FILE **dfpp, struct host_info *target, len_and_
                 target->user = xstrdup("anonymous:busybox@");
 
         sfp = open_socket(lsa);
-        if (ftpcmd(NULL, NULL, sfp, buf) != 220)
-                bb_error_msg_and_die("%s", sanitize_string(buf+4));
+        if (ftpcmd(NULL, NULL, sfp) != 220)
+                bb_error_msg_and_die("%s", sanitize_string(G.wget_buf + 4));
 
         /*
          * Splitting username:password pair,
@@ -385,24 +388,24 @@ static FILE* prepare_ftp_session(FILE **dfpp, struct host_info *target, len_and_
         str = strchr(target->user, ':');
         if (str)
                 *str++ = '\0';
-        switch (ftpcmd("USER ", target->user, sfp, buf)) {
+        switch (ftpcmd("USER ", target->user, sfp)) {
         case 230:
                 break;
         case 331:
-                if (ftpcmd("PASS ", str, sfp, buf) == 230)
+                if (ftpcmd("PASS ", str, sfp) == 230)
                         break;
                 /* fall through (failed login) */
         default:
-                bb_error_msg_and_die("ftp login: %s", sanitize_string(buf+4));
+                bb_error_msg_and_die("ftp login: %s", sanitize_string(G.wget_buf + 4));
         }
 
-        ftpcmd("TYPE I", NULL, sfp, buf);
+        ftpcmd("TYPE I", NULL, sfp);
 
         /*
          * Querying file size
          */
-        if (ftpcmd("SIZE ", target->path, sfp, buf) == 213) {
-                G.content_len = BB_STRTOOFF(buf+4, NULL, 10);
+        if (ftpcmd("SIZE ", target->path, sfp) == 213) {
+                G.content_len = BB_STRTOOFF(G.wget_buf + 4, NULL, 10);
                 if (G.content_len < 0 || errno) {
                         bb_error_msg_and_die("SIZE value is garbage");
                 }
@@ -412,20 +415,20 @@ static FILE* prepare_ftp_session(FILE **dfpp, struct host_info *target, len_and_
         /*
          * Entering passive mode
          */
-        if (ftpcmd("PASV", NULL, sfp, buf) != 227) {
+        if (ftpcmd("PASV", NULL, sfp) != 227) {
  pasv_error:
-                bb_error_msg_and_die("bad response to %s: %s", "PASV", sanitize_string(buf));
+                bb_error_msg_and_die("bad response to %s: %s", "PASV", sanitize_string(G.wget_buf));
         }
         // Response is "227 garbageN1,N2,N3,N4,P1,P2[)garbage]
         // Server's IP is N1.N2.N3.N4 (we ignore it)
         // Server's port for data connection is P1*256+P2
-        str = strrchr(buf, ')');
+        str = strrchr(G.wget_buf, ')');
         if (str) str[0] = '\0';
-        str = strrchr(buf, ',');
+        str = strrchr(G.wget_buf, ',');
         if (!str) goto pasv_error;
         port = xatou_range(str+1, 0, 255);
         *str = '\0';
-        str = strrchr(buf, ',');
+        str = strrchr(G.wget_buf, ',');
         if (!str) goto pasv_error;
         port += xatou_range(str+1, 0, 255) * 256;
         set_nport(lsa, htons(port));
@@ -433,20 +436,19 @@ static FILE* prepare_ftp_session(FILE **dfpp, struct host_info *target, len_and_
         *dfpp = open_socket(lsa);
 
         if (G.beg_range) {
-                sprintf(buf, "REST %"OFF_FMT"u", G.beg_range);
-                if (ftpcmd(buf, NULL, sfp, buf) == 350)
+                sprintf(G.wget_buf, "REST %"OFF_FMT"u", G.beg_range);
+                if (ftpcmd(G.wget_buf, NULL, sfp) == 350)
                         G.content_len -= G.beg_range;
         }
 
-        if (ftpcmd("RETR ", target->path, sfp, buf) > 150)
-                bb_error_msg_and_die("bad response to %s: %s", "RETR", sanitize_string(buf));
+        if (ftpcmd("RETR ", target->path, sfp) > 150)
+                bb_error_msg_and_die("bad response to %s: %s", "RETR", sanitize_string(G.wget_buf));
 
         return sfp;
 }
 
 static void NOINLINE retrieve_file_data(FILE *dfp, int output_fd)
 {
-        char buf[512];
 #if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT
 # if ENABLE_FEATURE_WGET_TIMEOUT
         unsigned second_cnt;
@@ -468,9 +470,9 @@ static void NOINLINE retrieve_file_data(FILE *dfp, int output_fd)
                         int n;
                         unsigned rdsz;
 
-                        rdsz = sizeof(buf);
+                        rdsz = sizeof(G.wget_buf);
                         if (G.got_clen) {
-                                if (G.content_len < (off_t)sizeof(buf)) {
+                                if (G.content_len < (off_t)sizeof(G.wget_buf)) {
                                         if ((int)G.content_len <= 0)
                                                 break;
                                         rdsz = (unsigned)G.content_len;
@@ -493,7 +495,7 @@ static void NOINLINE retrieve_file_data(FILE *dfp, int output_fd)
                                 progress_meter(PROGRESS_BUMP);
                         }
 #endif
-                        n = safe_fread(buf, rdsz, dfp);
+                        n = safe_fread(G.wget_buf, rdsz, dfp);
                         if (n <= 0) {
                                 if (ferror(dfp)) {
                                         /* perror will not work: ferror doesn't set errno */
@@ -501,7 +503,7 @@ static void NOINLINE retrieve_file_data(FILE *dfp, int output_fd)
                                 }
                                 break;
                         }
-                        xwrite(output_fd, buf, n);
+                        xwrite(output_fd, G.wget_buf, n);
 #if ENABLE_FEATURE_WGET_STATUSBAR
                         G.transferred += n;
                         progress_meter(PROGRESS_BUMP);
@@ -513,10 +515,10 @@ static void NOINLINE retrieve_file_data(FILE *dfp, int output_fd)
                 if (!G.chunked)
                         break;
 
-                safe_fgets(buf, sizeof(buf), dfp); /* This is a newline */
+                safe_fgets(G.wget_buf, sizeof(G.wget_buf), dfp); /* This is a newline */
  get_clen:
-                safe_fgets(buf, sizeof(buf), dfp);
-                G.content_len = STRTOOFF(buf, NULL, 16);
+                safe_fgets(G.wget_buf, sizeof(G.wget_buf), dfp);
+                G.content_len = STRTOOFF(G.wget_buf, NULL, 16);
                 /* FIXME: error check? */
                 if (G.content_len == 0)
                         break; /* all done! */
@@ -529,7 +531,6 @@ static void NOINLINE retrieve_file_data(FILE *dfp, int output_fd)
 int wget_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int wget_main(int argc UNUSED_PARAM, char **argv)
 {
-        char buf[512];
         struct host_info server, target;
         len_and_sockaddr *lsa;
         unsigned opt;
@@ -709,11 +710,11 @@ int wget_main(int argc UNUSED_PARAM, char **argv)
 #if ENABLE_FEATURE_WGET_AUTHENTICATION
                 if (target.user) {
                         fprintf(sfp, "Proxy-Authorization: Basic %s\r\n"+6,
-                                base64enc_512(buf, target.user));
+                                base64enc(target.user));
                 }
                 if (use_proxy && server.user) {
                         fprintf(sfp, "Proxy-Authorization: Basic %s\r\n",
-                                base64enc_512(buf, server.user));
+                                base64enc(server.user));
                 }
 #endif
 
@@ -743,10 +744,10 @@ int wget_main(int argc UNUSED_PARAM, char **argv)
                  * Retrieve HTTP response line and check for "200" status code.
                  */
  read_response:
-                if (fgets(buf, sizeof(buf), sfp) == NULL)
+                if (fgets(G.wget_buf, sizeof(G.wget_buf), sfp) == NULL)
                         bb_error_msg_and_die("no response from server");
 
-                str = buf;
+                str = G.wget_buf;
                 str = skip_non_whitespace(str);
                 str = skip_whitespace(str);
                 // FIXME: no error check
@@ -755,7 +756,7 @@ int wget_main(int argc UNUSED_PARAM, char **argv)
                 switch (status) {
                 case 0:
                 case 100:
-                        while (gethdr(buf, sizeof(buf), sfp /*, &n*/) != NULL)
+                        while (gethdr(sfp /*, &n*/) != NULL)
                                 /* eat all remaining headers */;
                         goto read_response;
                 case 200:
@@ -795,13 +796,13 @@ However, in real world it was observed that some web servers
                                 break;
                         /* fall through */
                 default:
-                        bb_error_msg_and_die("server returned error: %s", sanitize_string(buf));
+                        bb_error_msg_and_die("server returned error: %s", sanitize_string(G.wget_buf));
                 }
 
                 /*
                  * Retrieve HTTP headers.
                  */
-                while ((str = gethdr(buf, sizeof(buf), sfp /*, &n*/)) != NULL) {
+                while ((str = gethdr(sfp /*, &n*/)) != NULL) {
                         /* gethdr converted "FOO:" string to lowercase */
                         smalluint key;
                         /* strip trailing whitespace */
@@ -810,7 +811,7 @@ However, in real world it was observed that some web servers
                                 *s = '\0';
                                 s--;
                         }
-                        key = index_in_strings(keywords, buf) + 1;
+                        key = index_in_strings(keywords, G.wget_buf) + 1;
                         if (key == KEY_content_length) {
                                 G.content_len = BB_STRTOOFF(str, NULL, 10);
                                 if (G.content_len < 0 || errno) {
@@ -881,9 +882,9 @@ However, in real world it was observed that some web servers
         if (dfp != sfp) {
                 /* It's ftp. Close it properly */
                 fclose(dfp);
-                if (ftpcmd(NULL, NULL, sfp, buf) != 226)
-                        bb_error_msg_and_die("ftp error: %s", sanitize_string(buf+4));
-                /* ftpcmd("QUIT", NULL, sfp, buf); - why bother? */
+                if (ftpcmd(NULL, NULL, sfp) != 226)
+                        bb_error_msg_and_die("ftp error: %s", sanitize_string(G.wget_buf + 4));
+                /* ftpcmd("QUIT", NULL, sfp); - why bother? */
         }
 
         return EXIT_SUCCESS;