Add an input buffer (currently 32kB) to speed things up heaps, it still requires 25% longer to decompress as compared to upstream.
diff --git a/archival/libunarchive/unzip.c b/archival/libunarchive/unzip.c
index d8d5b77..770e414 100644
--- a/archival/libunarchive/unzip.c
+++ b/archival/libunarchive/unzip.c
@@ -88,8 +88,8 @@
/* This is used to sanify any unused bits from the bitbuffer
* so they arent skipped when reading trailers (trailing headers) */
-unsigned char gunzip_in_buffer_count;
-unsigned char *gunzip_in_buffer;
+//unsigned char gunzip_in_buffer_count;
+//unsigned char *gunzip_in_buffer;
/* gunzip_window size--must be a power of two, and
* at least 32K for zip's deflate method */
@@ -142,13 +142,30 @@
16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
};
+#define BYTEBUFFER_MAX 0x8000
+unsigned char *bytebuffer = NULL;
+unsigned int bytebuffer_offset = 0;
+unsigned int bytebuffer_size = 0;
+
+static void fill_bytebuffer()
+{
+ if (bytebuffer_offset >= bytebuffer_size) {
+ /* Leave the first 4 bytes empty so we can always unwind the bitbuffer
+ * to the front of the bytebuffer, leave 4 bytes free at end of tail
+ * so we can easily top up buffer in check_trailer_gzip() */
+ bytebuffer_size = 4 + xread(gunzip_src_fd, &bytebuffer[4], BYTEBUFFER_MAX - 8);
+ bytebuffer_offset = 4;
+ }
+}
+
static unsigned int fill_bitbuffer(unsigned int bitbuffer, unsigned int *current, const unsigned int required)
{
while (*current < required) {
- bitbuffer |= ((unsigned int) xread_char(gunzip_src_fd)) << *current;
+ fill_bytebuffer();
+ bitbuffer |= ((unsigned int) bytebuffer[bytebuffer_offset]) << *current;
+ bytebuffer_offset++;
*current += 8;
}
-
return(bitbuffer);
}
@@ -857,7 +874,10 @@
int ret;
if (needAnotherBlock) {
- if(e) { calculate_gunzip_crc(); return 0; } // Last block
+ if(e) {
+ calculate_gunzip_crc();
+ return 0;
+ } // Last block
method = inflate_block(&e);
needAnotherBlock = 0;
}
@@ -875,6 +895,7 @@
return 1; // More data left
} else needAnotherBlock = 1; // End of that block
}
+ /* Doesnt get here */
}
/*
@@ -923,7 +944,8 @@
gunzip_bytes_out = 0;
gunzip_src_fd = fd;
- gunzip_in_buffer = malloc(8);
+ /* Input buffer */
+ bytebuffer = xmalloc(BYTEBUFFER_MAX);
/* initialize gunzip_window, bit buffer */
gunzip_bk = 0;
@@ -940,12 +962,11 @@
free(gunzip_crc_table);
/* Store unused bytes in a global buffer so calling applets can access it */
- gunzip_in_buffer_count = 0;
if (gunzip_bk >= 8) {
/* Undo too much lookahead. The next read will be byte aligned
* so we can discard unused bits in the last meaningful byte. */
- gunzip_in_buffer[gunzip_in_buffer_count] = gunzip_bb & 0xff;
- gunzip_in_buffer_count++;
+ bytebuffer_offset--;
+ bytebuffer[bytebuffer_offset] = gunzip_bb & 0xff;
gunzip_bb >>= 8;
gunzip_bk -= 8;
}