unzip applet by Laurence Anderson

----------------------------------------------------------------------


git-svn-id: svn://busybox.net/trunk/busybox@3988 69ca8d6d-28ef-0310-b511-8ec308f3f277

1 files changed, 23 insertions, 25 deletions

diff --git a/libbb/unzip.c b/libbb/unzip.c
index 6c28d181d..8075fd717 100644
--- a/libbb/unzip.c
+++ b/libbb/unzip.c
@@ -80,7 +80,7 @@ static const int ERROR = 1;
 
 /*
  * window size--must be a power of two, and
- *  at least 32K for zip's deflate method 
+ *  at least 32K for zip's deflate method
  */
 static const int WSIZE = 0x8000;
 
@@ -846,7 +846,7 @@ static int inflate_block(int *e)
  *
  * GLOBAL VARIABLES: outcnt, bk, bb, hufts, inptr
  */
-static int inflate(void)
+extern int inflate(FILE *in, FILE *out)
 {
         int e;                          /* last block flag */
         int r;                          /* result code */
@@ -857,6 +857,13 @@ static int inflate(void)
         bk = 0;
         bb = 0;
 
+        in_file = in;
+        out_file = out;
+
+        /* Allocate all global buffers (for DYN_ALLOC option) */
+        window = xmalloc((size_t)(((2L*WSIZE)+1L)*sizeof(unsigned char)));
+        bytes_out = 0L;
+
         /* Create the crc table */
         make_crc_table();
 
@@ -881,13 +888,15 @@ static int inflate(void)
 
         /* flush out window */
         flush_window();
+        free(window);
+        free(crc_table);
 
         /* return success */
         return 0;
 }
 
 /* ===========================================================================
- * Unzip in to out.  This routine works on both gzip and pkzip files.
+ * Unzip in to out.  This routine works on gzip files only.
  *
  * IN assertions: the buffer inbuf contains already the beginning of
  *   the compressed data, from offsets inptr to insize-1 included.
@@ -901,9 +910,6 @@ extern int unzip(FILE *l_in_file, FILE *l_out_file)
         typedef void (*sig_type) (int);
         unsigned short i;
 
-        in_file = l_in_file;
-        out_file = l_out_file;
-
         if (signal(SIGINT, SIG_IGN) != SIG_IGN) {
                 (void) signal(SIGINT, (sig_type) abort_gzip);
         }
@@ -918,53 +924,48 @@ extern int unzip(FILE *l_in_file, FILE *l_out_file)
         }
 #endif
 
-        /* Allocate all global buffers (for DYN_ALLOC option) */
-        window = xmalloc((size_t)(((2L*WSIZE)+1L)*sizeof(unsigned char)));
-        outcnt = 0;
-        bytes_out = 0L;
-
         /* Magic header for gzip files, 1F 8B = \037\213 */
-        if ((fgetc(in_file) != 0x1F) || (fgetc(in_file) != 0x8b)) { 
+        if ((fgetc(l_in_file) != 0x1F) || (fgetc(l_in_file) != 0x8b)) {
                 error_msg("Invalid gzip magic");
                 return EXIT_FAILURE;
         }
 
         /* Check the compression method */
-        if (fgetc(in_file) != 8) {
+        if (fgetc(l_in_file) != 8) {
                 error_msg("Unknown compression method");
                 return(-1);
         }
 
-        flags = (unsigned char) fgetc(in_file);
+        flags = (unsigned char) fgetc(l_in_file);
 
         /* Ignore time stamp(4), extra flags(1), OS type(1) */
         for (i = 0; i < 6; i++) {
-                fgetc(in_file);
+                fgetc(l_in_file);
         }
 
         if (flags & 0x04) {
                 /* bit 2 set: extra field present */
-                const unsigned short extra = fgetc(in_file) + (fgetc(in_file) << 8);
+                const unsigned short extra = fgetc(l_in_file) + (fgetc(l_in_file) << 8);
 
                 for (i = 0; i < extra; i++) {
-                        fgetc(in_file);
+                        fgetc(l_in_file);
                 }
         }
 
         /* Discard original name if any */
         if (flags & 0x08) {
                 /* bit 3 set: original file name present */
-                while (fgetc(in_file) != 0);    /* null */
+                while (fgetc(l_in_file) != 0);  /* null */
         }
 
         /* Discard file comment if any */
         if (flags & 0x10) {
                 /* bit 4 set: file comment present */
-                while (fgetc(in_file) != 0);    /* null */
+                while (fgetc(l_in_file) != 0);  /* null */
         }
 
         /* Decompress */
-        if (inflate() != 0) {
+        if (inflate(l_in_file, l_out_file) != 0) {
                 error_msg("invalid compressed data--format violated");
         }
 
@@ -972,7 +973,7 @@ extern int unzip(FILE *l_in_file, FILE *l_out_file)
          * crc32  (see algorithm.doc)
          * uncompressed input size modulo 2^32
          */
-        fread(buf, 1, 8, in_file);
+        fread(buf, 1, 8, l_in_file);
 
         /* Validate decompression - crc */
         if ((unsigned int)((buf[0] | (buf[1] << 8)) |((buf[2] | (buf[3] << 8)) << 16)) != (crc ^ 0xffffffffL)) {
@@ -983,14 +984,11 @@ extern int unzip(FILE *l_in_file, FILE *l_out_file)
                 error_msg("invalid compressed data--length error");
         }
 
-        free(window);
-        free(crc_table);
-
         return 0;
 }
 
 /*
- * This needs access to global variables wondow and crc_table, so its not in its own file.
+ * This needs access to global variables window and crc_table, so its not in its own file.
  */
 extern void gz_close(int gunzip_pid)
 {