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authorGlenn L McGrath2002-01-02 13:52:26 +0000
committerGlenn L McGrath2002-01-02 13:52:26 +0000
commit87ac7028e01cdc4f504ea558a6ae3d086ed1bf2b (patch)
tree4f406c877f88a013c4e1dc650ac312640a95cb00 /libbb
parent438803311b67c6337ea97476e97336e027ef9a3a (diff)
downloadbusybox-87ac7028e01cdc4f504ea558a6ae3d086ed1bf2b.zip
busybox-87ac7028e01cdc4f504ea558a6ae3d086ed1bf2b.tar.gz
unzip applet by Laurence Anderson
----------------------------------------------------------------------
Diffstat (limited to 'libbb')
-rw-r--r--libbb/unzip.c48
1 files changed, 23 insertions, 25 deletions
diff --git a/libbb/unzip.c b/libbb/unzip.c
index 6c28d18..8075fd7 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)
{