Woops, my gunzip fix broke unzip, these cant be static

[oweals/busybox.git] / archival / libunarchive / decompress_unzip.c

diff --git a/archival/libunarchive/decompress_unzip.c b/archival/libunarchive/decompress_unzip.c
index 1b2d587d606f8a5ba38f957d24af5b79240b7902..3a7334ce9e10760bfd26a1609680a312f40785cc 100644 (file)
--- a/archival/libunarchive/decompress_unzip.c
+++ b/archival/libunarchive/decompress_unzip.c
@@ -86,16 +86,11 @@ static int gunzip_src_fd;
 unsigned int gunzip_bytes_out; /* number of output bytes */
 static unsigned int gunzip_outbuf_count;       /* bytes in output buffer */
 
-/* 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;
-
 /* gunzip_window size--must be a power of two, and
  *  at least 32K for zip's deflate method */
 static const int gunzip_wsize = 0x8000;
-
 static unsigned char *gunzip_window;
+
 static unsigned int *gunzip_crc_table;
 unsigned int gunzip_crc;
 
@@ -103,9 +98,16 @@ unsigned int gunzip_crc;
 #define BMAX 16        /* maximum bit length of any code (16 for explode) */
 #define N_MAX 288      /* maximum number of codes in any set */
 
+/* bitbuffer */
 static unsigned int gunzip_bb; /* bit buffer */
 static unsigned char gunzip_bk;        /* bits in bit buffer */
 
+/* These control the size of the bytebuffer */
+#define BYTEBUFFER_MAX 0x8000
+static unsigned char *bytebuffer = NULL;
+static unsigned int bytebuffer_offset = 0;
+static unsigned int bytebuffer_size = 0;
+
 static const unsigned short mask_bits[] = {
        0x0000, 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
        0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
@@ -142,11 +144,6 @@ static const unsigned char border[] = {
        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(void)
 {
        if (bytebuffer_offset >= bytebuffer_size) {
@@ -1011,3 +1008,33 @@ extern int inflate(int in, int out)
        GZ_gzReadClose();
        return 0;
 }
+
+extern void check_trailer_gzip(int src_fd)
+{
+       unsigned int stored_crc = 0;
+       unsigned char count;
+
+       /* top up the input buffer with the rest of the trailer */
+       count = bytebuffer_size - bytebuffer_offset;
+       if (count < 8) {
+               xread_all(src_fd, &bytebuffer[bytebuffer_size], 8 - count);
+               bytebuffer_size += 8 - count;
+       }
+       for (count = 0; count != 4; count++) {
+               stored_crc |= (bytebuffer[bytebuffer_offset] << (count * 8));
+               bytebuffer_offset++;
+       }
+
+       /* Validate decompression - crc */
+       if (stored_crc != (gunzip_crc ^ 0xffffffffL)) {
+               error_msg_and_die("crc error");
+       }
+
+       /* Validate decompression - size */
+       if (gunzip_bytes_out !=
+               (bytebuffer[bytebuffer_offset] | (bytebuffer[bytebuffer_offset+1] << 8) |
+               (bytebuffer[bytebuffer_offset+2] << 16) | (bytebuffer[bytebuffer_offset+3] << 24))) {
+               error_msg_and_die("Incorrect length, but crc is correct");
+       }
+
+}