Simplify unzip(), remove unused checks and unneccessary variables
This commit is contained in:
Glenn L McGrath
parent
ef03dbcd4d
commit
249f39a265
@ -310,12 +310,8 @@ static int huft_build(unsigned int *b, const unsigned int n, const unsigned int
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z = 1 << j; /* table entries for j-bit table */
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/* allocate and link in new table */
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if ((q = (huft_t *) xmalloc((z + 1) * sizeof(huft_t))) == NULL) {
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if (h) {
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huft_free(u[0]);
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}
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return 3; /* not enough memory */
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}
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q = (huft_t *) xmalloc((z + 1) * sizeof(huft_t));
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hufts += z + 1; /* track memory usage */
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*t = q + 1; /* link to list for huft_free() */
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*(t = &(q->v.t)) = NULL;
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@ -858,6 +854,9 @@ static int inflate(void)
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bk = 0;
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bb = 0;
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/* Create the crc table */
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make_crc_table();
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/* decompress until the last block */
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do {
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hufts = 0;
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@ -894,16 +893,10 @@ static int inflate(void)
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*/
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extern int unzip(FILE *l_in_file, FILE *l_out_file)
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{
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const int extra_field = 0x04; /* bit 2 set: extra field present */
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const int orig_name = 0x08; /* bit 3 set: original file name present */
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const int comment = 0x10; /* bit 4 set: file comment present */
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unsigned char buf[8]; /* extended local header */
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unsigned char flags; /* compression flags */
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char magic[2]; /* magic header */
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int method;
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typedef void (*sig_type) (int);
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int exit_code=0; /* program exit code */
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int i;
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unsigned short i;
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in_file = l_in_file;
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out_file = l_out_file;
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@ -927,67 +920,49 @@ extern int unzip(FILE *l_in_file, FILE *l_out_file)
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outcnt = 0;
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bytes_out = 0L;
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magic[0] = fgetc(in_file);
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magic[1] = fgetc(in_file);
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/* Magic header for gzip files, 1F 8B = \037\213 */
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if (memcmp(magic, "\037\213", 2) != 0) {
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if ((fgetc(in_file) != 0x1F) || (fgetc(in_file) != 0x8b)) {
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error_msg("Invalid gzip magic");
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return EXIT_FAILURE;
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}
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method = (int) fgetc(in_file);
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if (method != 8) {
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error_msg("unknown method %d -- get newer version of gzip", method);
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exit_code = 1;
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return -1;
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/* Check the compression method */
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if (fgetc(in_file) != 8) {
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error_msg("Unknown compression method");
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return(-1);
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}
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flags = (unsigned char) fgetc(in_file);
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/* Ignore time stamp(4), extra flags(1), OS type(1) */
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for (i = 0; i < 6; i++)
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for (i = 0; i < 6; i++) {
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fgetc(in_file);
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}
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if ((flags & extra_field) != 0) {
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size_t extra;
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extra = fgetc(in_file);
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extra += fgetc(in_file) << 8;
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if (flags & 0x04) {
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/* bit 2 set: extra field present */
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const unsigned short extra = fgetc(in_file) + (fgetc(in_file) << 8);
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for (i = 0; i < extra; i++)
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for (i = 0; i < extra; i++) {
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fgetc(in_file);
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}
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}
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/* Discard original name if any */
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if ((flags & orig_name) != 0) {
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if (flags & 0x08) {
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/* bit 3 set: original file name present */
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while (fgetc(in_file) != 0); /* null */
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}
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/* Discard file comment if any */
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if ((flags & comment) != 0) {
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if (flags & 0x10) {
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/* bit 4 set: file comment present */
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while (fgetc(in_file) != 0); /* null */
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}
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if (method < 0) {
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printf("it failed\n");
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return(exit_code); /* error message already emitted */
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}
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make_crc_table();
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/* Decompress */
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if (method == 8) {
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int res = inflate();
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if (res == 3) {
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error_msg(memory_exhausted);
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} else if (res != 0) {
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error_msg("invalid compressed data--format violated");
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}
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} else {
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error_msg("internal error, invalid method");
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if (inflate() != 0) {
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error_msg("invalid compressed data--format violated");
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}
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/* Get the crc and original length
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@ -1023,6 +998,7 @@ extern void gz_close(int gunzip_pid)
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if (waitpid(gunzip_pid, NULL, 0) == -1) {
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printf("Couldnt wait ?");
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}
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free(window);
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free(crc_table);
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free(window);
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free(crc_table);
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}
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@ -310,12 +310,8 @@ static int huft_build(unsigned int *b, const unsigned int n, const unsigned int
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z = 1 << j; /* table entries for j-bit table */
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/* allocate and link in new table */
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if ((q = (huft_t *) xmalloc((z + 1) * sizeof(huft_t))) == NULL) {
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if (h) {
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huft_free(u[0]);
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}
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return 3; /* not enough memory */
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}
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q = (huft_t *) xmalloc((z + 1) * sizeof(huft_t));
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hufts += z + 1; /* track memory usage */
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*t = q + 1; /* link to list for huft_free() */
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*(t = &(q->v.t)) = NULL;
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@ -858,6 +854,9 @@ static int inflate(void)
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bk = 0;
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bb = 0;
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/* Create the crc table */
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make_crc_table();
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/* decompress until the last block */
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do {
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hufts = 0;
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@ -894,16 +893,10 @@ static int inflate(void)
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*/
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extern int unzip(FILE *l_in_file, FILE *l_out_file)
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{
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const int extra_field = 0x04; /* bit 2 set: extra field present */
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const int orig_name = 0x08; /* bit 3 set: original file name present */
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const int comment = 0x10; /* bit 4 set: file comment present */
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unsigned char buf[8]; /* extended local header */
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unsigned char flags; /* compression flags */
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char magic[2]; /* magic header */
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int method;
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typedef void (*sig_type) (int);
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int exit_code=0; /* program exit code */
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int i;
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unsigned short i;
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in_file = l_in_file;
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out_file = l_out_file;
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@ -927,67 +920,49 @@ extern int unzip(FILE *l_in_file, FILE *l_out_file)
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outcnt = 0;
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bytes_out = 0L;
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magic[0] = fgetc(in_file);
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magic[1] = fgetc(in_file);
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/* Magic header for gzip files, 1F 8B = \037\213 */
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if (memcmp(magic, "\037\213", 2) != 0) {
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if ((fgetc(in_file) != 0x1F) || (fgetc(in_file) != 0x8b)) {
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error_msg("Invalid gzip magic");
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return EXIT_FAILURE;
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}
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method = (int) fgetc(in_file);
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if (method != 8) {
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error_msg("unknown method %d -- get newer version of gzip", method);
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exit_code = 1;
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return -1;
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/* Check the compression method */
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if (fgetc(in_file) != 8) {
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error_msg("Unknown compression method");
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return(-1);
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}
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flags = (unsigned char) fgetc(in_file);
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/* Ignore time stamp(4), extra flags(1), OS type(1) */
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for (i = 0; i < 6; i++)
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for (i = 0; i < 6; i++) {
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fgetc(in_file);
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}
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if ((flags & extra_field) != 0) {
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size_t extra;
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extra = fgetc(in_file);
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extra += fgetc(in_file) << 8;
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if (flags & 0x04) {
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/* bit 2 set: extra field present */
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const unsigned short extra = fgetc(in_file) + (fgetc(in_file) << 8);
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for (i = 0; i < extra; i++)
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for (i = 0; i < extra; i++) {
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fgetc(in_file);
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}
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}
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/* Discard original name if any */
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if ((flags & orig_name) != 0) {
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if (flags & 0x08) {
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/* bit 3 set: original file name present */
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while (fgetc(in_file) != 0); /* null */
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}
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/* Discard file comment if any */
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if ((flags & comment) != 0) {
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if (flags & 0x10) {
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/* bit 4 set: file comment present */
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while (fgetc(in_file) != 0); /* null */
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}
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if (method < 0) {
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printf("it failed\n");
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return(exit_code); /* error message already emitted */
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}
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make_crc_table();
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/* Decompress */
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if (method == 8) {
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int res = inflate();
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if (res == 3) {
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error_msg(memory_exhausted);
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} else if (res != 0) {
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error_msg("invalid compressed data--format violated");
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}
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} else {
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error_msg("internal error, invalid method");
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if (inflate() != 0) {
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error_msg("invalid compressed data--format violated");
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}
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/* Get the crc and original length
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@ -1023,6 +998,7 @@ extern void gz_close(int gunzip_pid)
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if (waitpid(gunzip_pid, NULL, 0) == -1) {
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printf("Couldnt wait ?");
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}
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free(window);
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free(crc_table);
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free(window);
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free(crc_table);
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}
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@ -310,12 +310,8 @@ static int huft_build(unsigned int *b, const unsigned int n, const unsigned int
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z = 1 << j; /* table entries for j-bit table */
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/* allocate and link in new table */
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if ((q = (huft_t *) xmalloc((z + 1) * sizeof(huft_t))) == NULL) {
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if (h) {
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huft_free(u[0]);
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}
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return 3; /* not enough memory */
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}
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q = (huft_t *) xmalloc((z + 1) * sizeof(huft_t));
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hufts += z + 1; /* track memory usage */
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*t = q + 1; /* link to list for huft_free() */
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*(t = &(q->v.t)) = NULL;
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@ -858,6 +854,9 @@ static int inflate(void)
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bk = 0;
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bb = 0;
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/* Create the crc table */
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make_crc_table();
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/* decompress until the last block */
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do {
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hufts = 0;
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@ -894,16 +893,10 @@ static int inflate(void)
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*/
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extern int unzip(FILE *l_in_file, FILE *l_out_file)
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{
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const int extra_field = 0x04; /* bit 2 set: extra field present */
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const int orig_name = 0x08; /* bit 3 set: original file name present */
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const int comment = 0x10; /* bit 4 set: file comment present */
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unsigned char buf[8]; /* extended local header */
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unsigned char flags; /* compression flags */
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char magic[2]; /* magic header */
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int method;
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typedef void (*sig_type) (int);
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int exit_code=0; /* program exit code */
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int i;
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unsigned short i;
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in_file = l_in_file;
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out_file = l_out_file;
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@ -927,67 +920,49 @@ extern int unzip(FILE *l_in_file, FILE *l_out_file)
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outcnt = 0;
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bytes_out = 0L;
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magic[0] = fgetc(in_file);
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magic[1] = fgetc(in_file);
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/* Magic header for gzip files, 1F 8B = \037\213 */
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if (memcmp(magic, "\037\213", 2) != 0) {
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if ((fgetc(in_file) != 0x1F) || (fgetc(in_file) != 0x8b)) {
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error_msg("Invalid gzip magic");
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return EXIT_FAILURE;
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}
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method = (int) fgetc(in_file);
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if (method != 8) {
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error_msg("unknown method %d -- get newer version of gzip", method);
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exit_code = 1;
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return -1;
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/* Check the compression method */
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if (fgetc(in_file) != 8) {
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error_msg("Unknown compression method");
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return(-1);
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}
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flags = (unsigned char) fgetc(in_file);
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/* Ignore time stamp(4), extra flags(1), OS type(1) */
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for (i = 0; i < 6; i++)
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for (i = 0; i < 6; i++) {
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fgetc(in_file);
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}
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if ((flags & extra_field) != 0) {
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size_t extra;
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extra = fgetc(in_file);
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extra += fgetc(in_file) << 8;
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if (flags & 0x04) {
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/* bit 2 set: extra field present */
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const unsigned short extra = fgetc(in_file) + (fgetc(in_file) << 8);
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for (i = 0; i < extra; i++)
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for (i = 0; i < extra; i++) {
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fgetc(in_file);
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}
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}
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/* Discard original name if any */
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if ((flags & orig_name) != 0) {
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if (flags & 0x08) {
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/* bit 3 set: original file name present */
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while (fgetc(in_file) != 0); /* null */
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}
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/* Discard file comment if any */
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if ((flags & comment) != 0) {
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if (flags & 0x10) {
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/* bit 4 set: file comment present */
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while (fgetc(in_file) != 0); /* null */
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}
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if (method < 0) {
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printf("it failed\n");
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return(exit_code); /* error message already emitted */
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}
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make_crc_table();
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/* Decompress */
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if (method == 8) {
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int res = inflate();
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if (res == 3) {
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error_msg(memory_exhausted);
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} else if (res != 0) {
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error_msg("invalid compressed data--format violated");
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}
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} else {
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error_msg("internal error, invalid method");
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if (inflate() != 0) {
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error_msg("invalid compressed data--format violated");
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}
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/* Get the crc and original length
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@ -1023,6 +998,7 @@ extern void gz_close(int gunzip_pid)
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if (waitpid(gunzip_pid, NULL, 0) == -1) {
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printf("Couldnt wait ?");
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}
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free(window);
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free(crc_table);
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free(window);
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free(crc_table);
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}
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