From e693dadb7ad258bdeecde2303d4ac0695808add3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sergiusz=20Baza=C5=84ski?= <q3k@q3k.org>
Date: Tue, 1 May 2012 19:02:53 +0000
Subject: [PATCH] Caching IVONA.

---
 terminal/main.c |  9 +++----
 terminal/tts.c  | 64 ++++++++++++++++++++++++++++++++++++++++++++++---
 terminal/tts.h  |  1 +
 3 files changed, 67 insertions(+), 7 deletions(-)

diff --git a/terminal/main.c b/terminal/main.c
index dc0e7ba..dbbbb84 100644
--- a/terminal/main.c
+++ b/terminal/main.c
@@ -25,7 +25,7 @@ int main(int argc, char **argv)
     }
     printf("Barcode initialization successful\n");
     
-    tts_speak("Refryżyrator gotowy do pracy.");
+    tts_speak_cached("Refryżyrator gotowy do pracy.");
 
     char MifareID[128];
     char Barcode[14];
@@ -43,14 +43,14 @@ int main(int argc, char **argv)
             {
                 if (LDAPResult == NO_SUCH_CARD)
                 {
-                    tts_speak("Nieznana karta.");
+                    tts_speak_cached("Nieznana karta.");
                     printf("NFC: Unknown card.\n");
 
                     continue;
                 }
                 else
                 {
-                    tts_speak("Błąd eldapa.");
+                    tts_speak_cached("Błąd eldapa.");
                     printf("LDAP: Unknown error %i\n", LDAPResult);
                     continue;
                 }
@@ -60,11 +60,12 @@ int main(int argc, char **argv)
             ldap_uid_from_dn(DN, UID);
             printf("LDAP uid: %s\n", UID);
 
-            tts_speak("Zeskanuj produkt.\n");
+            tts_speak_cached("Zeskanuj produkt.\n");
 
             int BarcodeResult = barcode_read(Barcode);
             if (BarcodeResult == 0)
             {
+                tts_speak_cached("bip");
                 printf("Scanned barcode %s\n", Barcode);
             }
             else
diff --git a/terminal/tts.c b/terminal/tts.c
index 52d36e7..88d9952 100644
--- a/terminal/tts.c
+++ b/terminal/tts.c
@@ -2,15 +2,73 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <openssl/sha.h>
 
 #include "base64.h"
 
 static char *g_IvonaURL = "http://www.ivona.com/online/fileSentence.php?l=en&e=0&v=1&t=%s";
 
-size_t tts_write_data(void *ptr, size_t size, size_t nmemb, FILE *stream)
+void _tts_digest(char *Text, char *DigestOut)
 {
-    int written = fwrite(ptr, size, nmemb, stream);
-    return written;
+    unsigned char Digest[32];
+
+    SHA256_CTX SHA;
+    memset(Digest, 0, 32);
+    SHA256_Init(&SHA);
+    SHA256_Update(&SHA, "hf-tts", 6);
+    SHA256_Update(&SHA, Text, strlen(Text));
+    SHA256_Final(Digest, &SHA);
+
+    for (int i = 0; i < 32; i++)
+        sprintf(DigestOut + 2 * i, "%02x", Digest[i]);
+
+    DigestOut[64] = 0;
+}
+
+void tts_speak_cached(char *Text)
+{
+    char CachePath[128];
+    strcpy(CachePath, "/tmp/hftts-");
+    _tts_digest(Text, CachePath + 11);
+    CachePath[11 + 64] = 0;
+
+    int B64OutputLength;
+    char *B64Output = (char *)malloc(strlen(Text) * 2);
+    bin_to_b64(B64Output, Text, strlen(Text));
+
+    char *URL = (char *)malloc(strlen(B64Output) + strlen(g_IvonaURL));
+    sprintf(URL, g_IvonaURL, B64Output);
+    
+    FILE *File = fopen(CachePath, "r");
+    if (File)
+    {
+        printf("Cache hit on \"%s\" [%s]\n", Text, CachePath);
+        fclose(File);
+    }
+    else
+    {
+        printf("Cache miss on \"%s\" [%s]\n", Text, CachePath);
+        char *CommandLine = malloc(256);
+        sprintf(CommandLine, "curl -L -s -A Mozilla \"%s\" > %s", URL, CachePath);
+        printf("Executing %s...\n", CommandLine);
+        system(CommandLine);
+
+        free(CommandLine);
+    }
+
+    if (!fork())
+    {
+        char *CommandLineChild = malloc(strlen(URL) + 100);
+        sprintf(CommandLineChild, "mpg123 -2 -q %s", CachePath);
+        printf("Executing %s...\n", CommandLineChild);
+        system(CommandLineChild);
+        free(CommandLineChild);
+        printf("Child slave exiting.\n");
+        exit(0);
+    }
+    
+    free((void *)URL);
+    free((void *)B64Output);
 }
 
 void tts_speak(char *Text)
diff --git a/terminal/tts.h b/terminal/tts.h
index 6cdcac0..27d4e79 100644
--- a/terminal/tts.h
+++ b/terminal/tts.h
@@ -2,5 +2,6 @@
 #define __TTS_H__
 
 void tts_speak(char *Text);
+void tts_speak_cached(char *Text);
 
 #endif