Fix a problem in the shell tools readfile() command causing blobs to be

truncated at the first embedded 0x00 byte in release builds, or an assert() to
fail in a debug build.

FossilOrigin-Name: 8dedd6ad44bd1d103dced9d1350188cb2327128d

manifest

@@ -1,5 +1,5 @@
-C Add\sthe\s".lint\sfkey-indexes"\scommand\sto\sthe\scommand-line\sshell.
-D 2016-12-16T18:43:49.329
+C Fix\sa\sproblem\sin\sthe\sshell\stools\sreadfile()\scommand\scausing\sblobs\sto\sbe\s\ntruncated\sat\sthe\sfirst\sembedded\s0x00\sbyte\sin\srelease\sbuilds,\sor\san\sassert()\sto\nfail\sin\sa\sdebug\sbuild.
+D 2016-12-17T08:18:05.241
 F Makefile.in c194b58fe00c370a48ac6ae6945e92a7781db1c8
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc b8ca53350ae545e3562403d5da2a69cec79308da
@@ -389,7 +389,7 @@ F src/random.c 80f5d666f23feb3e6665a6ce04c7197212a88384
 F src/resolve.c bb070cf5f23611c44ab7e4788803684e385fc3fb
 F src/rowset.c 7b7e7e479212e65b723bf40128c7b36dc5afdfac
 F src/select.c e4c687333c5fa33b1ce05c37bfbea6e09d3dbee9
-F src/shell.c 9be556ad9c7cf429d0acc48e386960d290c4df75
+F src/shell.c 95fc9f4cbdfda44f3328ea23d69fb1905a974a90
 F src/sqlite.h.in e8e2d108d82647f0a812fdb74accf91c1ec08ddc
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h 8648034aa702469afb553231677306cc6492a1ae
@@ -1094,7 +1094,8 @@ F test/shell2.test e242a9912f44f4c23c3d1d802a83e934e84c853b
 F test/shell3.test 9b95ba643eaa228376f06a898fb410ee9b6e57c1
 F test/shell4.test 89ad573879a745974ff2df20ff97c5d6ffffbd5d
 F test/shell5.test 50a732c1c2158b1cd62cf53975ce1ea7ce6b9dc9
-F test/shell6.test 806472f6ffdd31d632e27dbe8515c0c45f68f3ec
+F test/shell6.test 87b47bf2f5c47a4e44f07dd119ea88ae303a8247
+F test/shell7.test 07751911b294698e0c5df67bcbd29e7d2f0f2907
 F test/shortread1.test bb591ef20f0fd9ed26d0d12e80eee6d7ac8897a3
 F test/show_speedtest1_rtree.tcl 32e6c5f073d7426148a6936a0408f4b5b169aba5
 F test/shrink.test 1b4330b1fd9e818c04726d45cb28db73087535ce
@@ -1537,8 +1538,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P d66ec5cfb67c6c8134fb642e0c2f72113fe1b7fd 1268dc77712d85de0b62332c88b22f7489f4e87f
-R 687c3d19b933c4e396bfa9c657e5c87e
-T +closed 1268dc77712d85de0b62332c88b22f7489f4e87f
-U drh
-Z fa4bf48b88eaf725bf36396e1a6dc597
+P 94689e3bdac2eabbcf1a51d741c2604ed4bd8a40
+R b4ced5d015604f5a5058a9f967dfbb21
+U dan
+Z aab7365a5b426408e7c16bc3f1fbf9d3

manifest.uuid

@@ -1 +1 @@
-94689e3bdac2eabbcf1a51d741c2604ed4bd8a40
+8dedd6ad44bd1d103dced9d1350188cb2327128d

src/shell.c

@@ -2280,14 +2280,22 @@ void session_help(ShellState *p){
 /* Forward reference */
 static int process_input(ShellState *p, FILE *in);
 
-
 /*
-** Read the content of a file into memory obtained from sqlite3_malloc64().
-** The caller is responsible for freeing the memory.
+** Read the content of file zName into memory obtained from sqlite3_malloc64()
+** and return a pointer to the buffer. The caller is responsible for freeing 
+** the memory. 
 **
-** NULL is returned if any error is encountered.
+** If parameter pnByte is not NULL, (*pnByte) is set to the number of bytes
+** read.
+**
+** For convenience, a nul-terminator byte is always appended to the data read
+** from the file before the buffer is returned. This byte is not included in
+** the final value of (*pnByte), if applicable.
+**
+** NULL is returned if any error is encountered. The final value of *pnByte
+** is undefined in this case.
 */
-static char *readFile(const char *zName){
+static char *readFile(const char *zName, int *pnByte){
   FILE *in = fopen(zName, "rb");
   long nIn;
   size_t nRead;
@@ -2305,6 +2313,7 @@ static char *readFile(const char *zName){
     return 0;
   }
   pBuf[nIn] = 0;
+  if( pnByte ) *pnByte = nIn;
   return pBuf;
 }
 
@@ -2320,12 +2329,13 @@ static void readfileFunc(
 ){
   const char *zName;
   void *pBuf;
+  int nBuf;
 
   UNUSED_PARAMETER(argc);
   zName = (const char*)sqlite3_value_text(argv[0]);
   if( zName==0 ) return;
-  pBuf = readFile(zName);
-  if( pBuf ) sqlite3_result_blob(context, pBuf, -1, sqlite3_free);
+  pBuf = readFile(zName, &nBuf);
+  if( pBuf ) sqlite3_result_blob(context, pBuf, nBuf, sqlite3_free);
 }
 
 /*
@@ -3665,7 +3675,7 @@ static int do_meta_command(char *zLine, ShellState *p){
     if( nArg!=2 ){
       raw_printf(stderr, "Usage: .check GLOB-PATTERN\n");
       rc = 2;
-    }else if( (zRes = readFile("testcase-out.txt"))==0 ){
+    }else if( (zRes = readFile("testcase-out.txt", 0))==0 ){
       raw_printf(stderr, "Error: cannot read 'testcase-out.txt'\n");
       rc = 2;
     }else if( testcase_glob(azArg[1],zRes)==0 ){

test/shell6.test

@@ -9,6 +9,8 @@
 #
 #***********************************************************************
 #
+# Test the shell tool ".lint fkey-indexes" command.
+#
 
 set testdir [file dirname $argv0]
 source $testdir/tester.tcl

test/shell7.test

@@ -0,0 +1,54 @@
+# 2016 December 17
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+#
+# Test the readfile() function built into the shell tool. Specifically,
+# that it does not truncate the blob read at the first embedded 0x00
+# byte.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+set testprefix shell7
+set CLI [test_find_cli]
+
+
+do_execsql_test 1.0 { 
+  CREATE TABLE f1(tn INTEGER PRIMARY KEY, x BLOB); 
+  CREATE TABLE f2(tn INTEGER PRIMARY KEY, x BLOB); 
+
+  INSERT INTO f1 VALUES(1, X'01020304');
+  INSERT INTO f1 VALUES(2, X'01000304');
+  INSERT INTO f1 VALUES(3, randomblob(200));
+}
+
+foreach {tn l x} [db eval { SELECT tn, length(x) AS l, x FROM f1 }] {
+  forcedelete shell7_test.bin
+  set fd [open shell7_test.bin w]
+  fconfigure $fd -encoding binary
+  fconfigure $fd -translation binary
+  puts -nonewline $fd $x
+  close $fd
+
+  do_test 1.$tn.1 { file size shell7_test.bin } $l
+  do_test 1.$tn.2 { 
+    catchcmd test.db "INSERT INTO f2 VALUES($tn, readfile('shell7_test.bin'));"
+  } {0 {}}
+
+  do_execsql_test 1.$tn.3 { 
+    SELECT (SELECT x FROM f1 WHERE tn=1)==(SELECT x FROM f2 WHERE tn=1)
+  } {1}
+}
+
+
+
+finish_test
+
+