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unzip applet by Laurence Anderson

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----------------------------------------------------------------------
This commit is contained in:
Glenn L McGrath
2002-01-02 13:52:26 +00:00
parent 438803311b
commit 87ac7028e0
13 changed files with 302 additions and 78 deletions
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48
libbb/unzip.c
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@@ -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)
{