Enable storing some files gzipped in the .apk

We gzip them separately in the Makefile and the gzipped result will be
stored without (further) compression in the .apk.

Use this to store the ttf font files. Shaves off a bit .apk size.

This might seem a bit odd way to do it, why not store these files in
the normal Zip compressed fashion in the .apk? It seems hard to tell
Ant (based on path, not extension) what files to compress and what
not, so we have to keep telling it to not (further) compress any files
at all.

Change-Id: I0d40d8811e6c9df6b28c285845b1db225507f5d4

1 files changed, 91 insertions, 11 deletions

diff --git a/sal/android/lo-bootstrap.c b/sal/android/lo-bootstrap.c
index b29fb7d044b9..f1f2155a5134 100644
--- a/sal/android/lo-bootstrap.c
+++ b/sal/android/lo-bootstrap.c
@@ -41,6 +41,7 @@
 #include <dlfcn.h>
 #include <sys/mman.h>
 
+#include <zlib.h>
 #include <jni.h>
 
 #include <android/log.h>
@@ -82,6 +83,7 @@ static int sleep_time = 0;
 
 /* These are valid / used in all apps. */
 static const char *data_dir;
+static const char *cache_dir;
 static const char **library_locations;
 static void *apk_file;
 static int apk_file_size;
@@ -312,21 +314,24 @@ JNI_OnLoad(JavaVM* vm, void* reserved)
 }
 
 // public static native boolean setup(String dataDir,
+//                                    String cacheDir,
 //                                    String apkFile,
 //                                    String[] ld_library_path);
 
 __attribute__ ((visibility("default")))
 jboolean
-Java_org_libreoffice_android_Bootstrap_setup__Ljava_lang_String_2Ljava_lang_String_2_3Ljava_lang_String_2
+Java_org_libreoffice_android_Bootstrap_setup__Ljava_lang_String_2Ljava_lang_String_2Ljava_lang_String_2_3Ljava_lang_String_2
     (JNIEnv* env,
      jobject clazz,
      jstring dataDir,
+     jstring cacheDir,
      jstring apkFile,
      jobjectArray ld_library_path)
 {
     struct stat st;
     int i, n, fd;
     const char *dataDirPath;
+    const char *cacheDirPath;
     const char *apkFilePath;
     char *lib_dir;
 
@@ -359,6 +364,12 @@ Java_org_libreoffice_android_Bootstrap_setup__Ljava_lang_String_2Ljava_lang_Stri
     for (n = 0; library_locations[n] != NULL; n++)
         LOGI("library_locations[%d] = %s", n, library_locations[n]);
 
+    cacheDirPath = (*env)->GetStringUTFChars(env, cacheDir, NULL);
+
+    cache_dir = strdup(cacheDirPath);
+
+    (*env)->ReleaseStringUTFChars(env, cacheDir, cacheDirPath);
+
     apkFilePath =  (*env)->GetStringUTFChars(env, apkFile, NULL);
 
     fd = open(apkFilePath, O_RDONLY);
@@ -743,6 +754,7 @@ lo_dlcall_argc_argv(void *function,
 }
 
 #define UNPACK_TREE "/assets/unpack"
+#define UNPACK_TREE_GZ "/assets/gz.unpack"
 
 static int
 mkdir_p(const char *dirname)
@@ -770,8 +782,70 @@ mkdir_p(const char *dirname)
     return 1;
 }
 
+static int
+extract_gzipped(const char *filename,
+                const char *apkentry,
+                int size,
+                FILE *f)
+{
+    gzFile gzfd;
+    int gzerrno;
+    int nbytes;
+    char buf[5000];
+    int total = 0;
+    char *tmpname;
+    FILE *tmp;
+
+    tmpname = malloc(strlen(cache_dir) + strlen("/tmp.gz") + 1);
+    strcpy(tmpname, cache_dir);
+    strcat(tmpname, "/tmp.gz");
+
+    tmp = fopen(tmpname, "w+");
+    unlink(tmpname);
+
+    if (tmp == NULL) {
+        LOGE("extract_gzipped: could not create %s: %s", tmpname, strerror(errno));
+        free(tmpname);
+        return 0;
+    }
+
+    if (fwrite(apkentry, size, 1, tmp) != 1) {
+        LOGE("extract_gzipped: could not write gzipped entry to %s: %s", tmpname, strerror(errno));
+        fclose(tmp);
+        free(tmpname);
+        return 0;
+    }
+
+    free(tmpname);
+    rewind(tmp);
+
+    gzfd = gzdopen(fileno(tmp), "rb");
+    if (gzfd == NULL) {
+        LOGE("extract_gzipped: gzdopen failed");
+        fclose(tmp);
+        return 0;
+    }
+
+    while ((nbytes = gzread(gzfd, buf, sizeof(buf))) > 0) {
+        fwrite(buf, nbytes, 1, f);
+        total += nbytes;
+    }
+    if (nbytes == -1) {
+        LOGE("extract_gzipped: Could not gzread from %s: %s", filename, gzerror(gzfd, &gzerrno));
+        return total;
+    }
+    if (gzclose(gzfd) == -1) {
+        LOGE("extract_gzipped: gzclose failed");
+        return total;
+    }
+
+    return total;
+}
+
 static void
-extract_files(const char *prefix)
+extract_files(const char *root,
+              const char *prefix,
+              int gzipped)
 {
     lo_apk_dir *tree = lo_apk_opendir(prefix);
     struct dirent *dent;
@@ -789,7 +863,7 @@ extract_files(const char *prefix)
             strcpy(subdir, prefix);
             strcat(subdir, "/");
             strcat(subdir, dent->d_name);
-            extract_files(subdir);
+            extract_files(root, subdir, gzipped);
             free(subdir);
         } else {
             char *filename;
@@ -811,10 +885,10 @@ extract_files(const char *prefix)
                 continue;
             }
 
-            newfilename = malloc(strlen(data_dir) + 1 + strlen(prefix) - sizeof(UNPACK_TREE) + 1 + strlen(dent->d_name) + 1);
+            newfilename = malloc(strlen(data_dir) + 1 + strlen(prefix) - strlen(root) + strlen(dent->d_name) + 1);
             strcpy(newfilename, data_dir);
             strcat(newfilename, "/");
-            strcat(newfilename, prefix + sizeof(UNPACK_TREE));
+            strcat(newfilename, prefix + strlen(root) + 1);
 
             if (!mkdir_p(newfilename)) {
                 free(filename);
@@ -826,7 +900,7 @@ extract_files(const char *prefix)
             strcat(newfilename, dent->d_name);
 
             if (stat(newfilename, &st) == 0 &&
-                st.st_size == size) {
+                (gzipped || st.st_size == size)) {
                 free(filename);
                 free(newfilename);
                 continue;
@@ -840,12 +914,17 @@ extract_files(const char *prefix)
                 continue;
             }
 
-            if (fwrite(apkentry, size, 1, f) != 1) {
-                LOGE("extract_files: Could not write %d bytes to %s: %s", size, newfilename, strerror(errno));
+            if (!gzipped) {
+                if (fwrite(apkentry, size, 1, f) != 1) {
+                    LOGE("extract_files: Could not write %d bytes to %s: %s", size, newfilename, strerror(errno));
+                } else {
+                    LOGI("extract_files: Copied %s to %s: %d bytes", filename, newfilename, size);
+                }
+            } else {
+                size = extract_gzipped(filename, apkentry, size, f);
+                LOGI("extract_files: Decompressed %s to %s: %d bytes", filename, newfilename, size);
             }
 
-            LOGI("extract_files: Copied %s to %s: %d bytes", filename, newfilename, size);
-
             fclose(f);
 
             free(filename);
@@ -865,7 +944,8 @@ Java_org_libreoffice_android_Bootstrap_extract_1files(JNIEnv* env,
     (void) env;
     (void) clazz;
 
-    extract_files(UNPACK_TREE);
+    extract_files(UNPACK_TREE, UNPACK_TREE, 0);
+    extract_files(UNPACK_TREE_GZ, UNPACK_TREE_GZ, 1);
 }
 
 /* Android's JNI works only to libraries loaded through Java's