--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.pack/share/native/common-unpack/zip.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,700 @@
+/*
+ * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * Note: Lifted from uncrunch.c from jdk sources
+ */
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <time.h>
+
+#include <stdlib.h>
+
+#ifndef _MSC_VER
+#include <strings.h>
+#endif
+
+#include "defines.h"
+#include "bytes.h"
+#include "utils.h"
+
+#include "constants.h"
+#include "unpack.h"
+
+#include "zip.h"
+
+#ifdef NO_ZLIB
+
+inline bool jar::deflate_bytes(bytes& head, bytes& tail) {
+ return false;
+}
+inline uint jar::get_crc32(uint c, uchar *ptr, uint len) { return 0; }
+#define Z_NULL NULL
+
+#else // Have ZLIB
+
+#include <zlib.h>
+
+inline uint jar::get_crc32(uint c, uchar *ptr, uint len) { return crc32(c, ptr, len); }
+
+#endif // End of ZLIB
+
+#ifdef _BIG_ENDIAN
+#define SWAP_BYTES(a) \
+ ((((a) << 8) & 0xff00) | 0x00ff) & (((a) >> 8) | 0xff00)
+#else
+#define SWAP_BYTES(a) (a)
+#endif
+
+#define GET_INT_LO(a) \
+ SWAP_BYTES(a & 0xFFFF)
+
+#define GET_INT_HI(a) \
+ SWAP_BYTES((a >> 16) & 0xFFFF)
+
+static const ushort jarmagic[2] = { SWAP_BYTES(0xCAFE), 0 };
+
+void jar::init(unpacker* u_) {
+ BYTES_OF(*this).clear();
+ u = u_;
+ u->jarout = this;
+}
+
+// Write data to the ZIP output stream.
+void jar::write_data(void* buff, size_t len) {
+ while (len > 0) {
+ int rc = (int)fwrite(buff, 1, len, jarfp);
+ if (rc <= 0) {
+ fprintf(u->errstrm, "Error: write on output file failed err=%d\n",errno);
+ exit(1); // Called only from the native standalone unpacker
+ }
+ output_file_offset += rc;
+ buff = ((char *)buff) + rc;
+ len -= rc;
+ }
+}
+
+void jar::add_to_jar_directory(const char* fname, bool store, int modtime,
+ int len, int clen, uLong crc) {
+ uint fname_length = (uint)strlen(fname);
+ ushort header[23];
+ if (modtime == 0) modtime = default_modtime;
+ uLong dostime = get_dostime(modtime);
+
+ header[0] = (ushort)SWAP_BYTES(0x4B50);
+ header[1] = (ushort)SWAP_BYTES(0x0201);
+ header[2] = (ushort)SWAP_BYTES(( store ) ? 0x0A : 0x14);
+
+ // required version
+ header[3] = (ushort)SWAP_BYTES(( store ) ? 0x0A : 0x14);
+
+ // Flags - UTF-8 compression and separating crc and sizes
+ // into separate headers for deflated file
+ header[4] = ( store ) ? SWAP_BYTES(0x0800) : 0x0808;
+
+ // Compression method 8=deflate.
+ header[5] = ( store ) ? 0x0 : SWAP_BYTES(0x08);
+
+ // Last modified date and time.
+ header[6] = (ushort)GET_INT_LO(dostime);
+ header[7] = (ushort)GET_INT_HI(dostime);
+
+ // CRC
+ header[8] = (ushort)GET_INT_LO(crc);
+ header[9] = (ushort)GET_INT_HI(crc);
+
+ // Compressed length:
+ header[10] = (ushort)GET_INT_LO(clen);
+ header[11] = (ushort)GET_INT_HI(clen);
+
+ // Uncompressed length.
+ header[12] = (ushort)GET_INT_LO(len);
+ header[13] = (ushort)GET_INT_HI(len);
+
+ // Filename length
+ header[14] = (ushort)SWAP_BYTES(fname_length);
+ // So called "extra field" length.
+ // If it's the first record we must add JAR magic sequence
+ header[15] = ( central_directory_count ) ? 0 : (ushort)SWAP_BYTES(4);
+ // So called "comment" length.
+ header[16] = 0;
+ // Disk number start
+ header[17] = 0;
+ // File flags => binary
+ header[18] = 0;
+ // More file flags
+ header[19] = 0;
+ header[20] = 0;
+ // Offset within ZIP file.
+ header[21] = (ushort)GET_INT_LO(output_file_offset);
+ header[22] = (ushort)GET_INT_HI(output_file_offset);
+
+ // Copy the whole thing into the central directory.
+ central_directory.append(header, sizeof(header));
+
+ // Copy the fname to the header.
+ central_directory.append(fname, fname_length);
+
+ // Add jar magic for the first record
+ if (central_directory_count == 0) {
+ central_directory.append((void *)jarmagic, sizeof(jarmagic));
+ }
+
+ central_directory_count++;
+}
+
+void jar::write_jar_header(const char* fname, bool store, int modtime,
+ int len, int clen, uint crc) {
+ uint fname_length = (uint)strlen(fname);
+ ushort header[15];
+ if (modtime == 0) modtime = default_modtime;
+ uLong dostime = get_dostime(modtime);
+
+ // ZIP LOC magic.
+ header[0] = (ushort)SWAP_BYTES(0x4B50);
+ header[1] = (ushort)SWAP_BYTES(0x0403);
+
+ // Version
+ header[2] = (ushort)SWAP_BYTES(( store ) ? 0x0A : 0x14);
+
+ // General purpose flags - same as in the Central Directory
+ header[3] = ( store ) ? SWAP_BYTES(0x0800) : 0x0808;
+
+ // Compression method = deflate
+ header[4] = ( store ) ? 0x0 : SWAP_BYTES(0x08);
+
+ // Last modified date and time.
+ header[5] = (ushort)GET_INT_LO(dostime);
+ header[6] = (ushort)GET_INT_HI(dostime);
+
+ // CRC, 0 if deflated, will come separately in extra header
+ header[7] = ( store ) ? (ushort)GET_INT_LO(crc) : 0;
+ header[8] = ( store ) ? (ushort)GET_INT_HI(crc) : 0;
+
+ // Compressed length, 0 if deflated
+ header[9] = ( store ) ? (ushort)GET_INT_LO(clen) : 0;
+ header[10] = ( store ) ? (ushort)GET_INT_HI(clen) : 0;
+
+ // Uncompressed length, 0 if deflated
+ header[11] = ( store ) ? (ushort)GET_INT_LO(len) : 0;
+ header[12] = ( store ) ? (ushort)GET_INT_HI(len) : 0;
+
+ // Filename length
+ header[13] = (ushort)SWAP_BYTES(fname_length);
+ // So called "extra field" length.
+ header[14] = ( central_directory_count - 1 ) ? 0 : (ushort)SWAP_BYTES(4);
+
+ // Write the LOC header to the output file.
+ write_data(header, (int)sizeof(header));
+
+ // Copy the fname to the header.
+ write_data((char*)fname, (int)fname_length);
+
+ if (central_directory_count == 1) {
+ // Write JAR magic sequence
+ write_data((void *)jarmagic, (int)sizeof(jarmagic));
+ }
+}
+
+void jar::write_jar_extra(int len, int clen, uint crc) {
+ ushort header[8];
+ // Extra field signature
+ header[0] = (ushort)SWAP_BYTES(0x4B50);
+ header[1] = (ushort)SWAP_BYTES(0x0807);
+ // CRC
+ header[2] = (ushort)GET_INT_LO(crc);
+ header[3] = (ushort)GET_INT_HI(crc);
+ // Compressed length
+ header[4] = (ushort)GET_INT_LO(clen);
+ header[5] = (ushort)GET_INT_HI(clen);
+ // Uncompressed length
+ header[6] = (ushort)GET_INT_LO(len);
+ header[7] = (ushort)GET_INT_HI(len);
+
+ write_data(header, sizeof(header));
+}
+
+static const char marker_comment[] = ZIP_ARCHIVE_MARKER_COMMENT;
+
+void jar::write_central_directory() {
+ bytes mc; mc.set(marker_comment);
+
+ ushort header[11];
+ ushort header64[38];
+
+ // Create the End of Central Directory structure.
+ header[0] = (ushort)SWAP_BYTES(0x4B50);
+ header[1] = (ushort)SWAP_BYTES(0x0605);
+ // disk numbers
+ header[2] = 0;
+ header[3] = 0;
+ // Number of entries in central directory.
+ header[4] = ( central_directory_count >= 0xffff ) ? 0xffff : (ushort)SWAP_BYTES(central_directory_count);
+ header[5] = ( central_directory_count >= 0xffff ) ? 0xffff : (ushort)SWAP_BYTES(central_directory_count);
+ // Size of the central directory}
+ header[6] = (ushort)GET_INT_LO((int)central_directory.size());
+ header[7] = (ushort)GET_INT_HI((int)central_directory.size());
+ // Offset of central directory within disk.
+ header[8] = (ushort)GET_INT_LO(output_file_offset);
+ header[9] = (ushort)GET_INT_HI(output_file_offset);
+ // zipfile comment length;
+ header[10] = (ushort)SWAP_BYTES((int)mc.len);
+
+ // Write the central directory.
+ PRINTCR((2, "Central directory at %d\n", output_file_offset));
+ write_data(central_directory.b);
+
+ // If number of records exceeds the 0xFFFF we need to prepend extended
+ // Zip64 End of Central Directory record and its locator to the old
+ // style ECD record
+ if (central_directory_count > 0xFFFF) {
+ // Zip64 END signature
+ header64[0] = (ushort)SWAP_BYTES(0x4B50);
+ header64[1] = (ushort)0x0606;
+ // Size of header (long)
+ header64[2] = (ushort)SWAP_BYTES(44);;
+ header64[3] = 0;
+ header64[4] = 0;
+ header64[5] = 0;
+ // Version produced and required (short)
+ header64[6] = (ushort)SWAP_BYTES(45);
+ header64[7] = (ushort)SWAP_BYTES(45);
+ // Current disk number (int)
+ header64[8] = 0;
+ header64[9] = 0;
+ // Central directory start disk (int)
+ header64[10] = 0;
+ header64[11] = 0;
+ // Count of records on disk (long)
+ header64[12] = (ushort)GET_INT_LO(central_directory_count);
+ header64[13] = (ushort)GET_INT_HI(central_directory_count);
+ header64[14] = 0;
+ header64[15] = 0;
+ // Count of records totally (long)
+ header64[16] = (ushort)GET_INT_LO(central_directory_count);
+ header64[17] = (ushort)GET_INT_HI(central_directory_count);
+ header64[18] = 0;
+ header64[19] = 0;
+ // Length of the central directory (long)
+ header64[20] = header[6];
+ header64[21] = header[7];
+ header64[22] = 0;
+ header64[23] = 0;
+ // Offset of central directory (long)
+ header64[24] = header[8];
+ header64[25] = header[9];
+ header64[26] = 0;
+ header64[27] = 0;
+ // Zip64 end of central directory locator
+ // Locator signature
+ header64[28] = (ushort)SWAP_BYTES(0x4B50);
+ header64[29] = (ushort)SWAP_BYTES(0x0706);
+ // Start disk number (int)
+ header64[30] = 0;
+ header64[31] = 0;
+ // Offset of zip64 END record (long)
+ header64[32] = (ushort)GET_INT_LO(output_file_offset);
+ header64[33] = (ushort)GET_INT_HI(output_file_offset);
+ header64[34] = 0;
+ header64[35] = 0;
+ // Total number of disks (int)
+ header64[36] = (ushort)SWAP_BYTES(1);
+ header64[37] = 0;
+ write_data(header64, sizeof(header64));
+ }
+
+ // Write the End of Central Directory structure.
+ PRINTCR((2, "end-of-directory at %d\n", output_file_offset));
+ write_data(header, sizeof(header));
+
+ PRINTCR((2, "writing zip comment\n"));
+ // Write the comment.
+ write_data(mc);
+}
+
+// Public API
+
+// Open a Jar file and initialize.
+void jar::openJarFile(const char* fname) {
+ if (!jarfp) {
+ PRINTCR((1, "jar::openJarFile: opening %s\n",fname));
+ jarname = fname;
+ jarfp = fopen(fname, "wb");
+ if (!jarfp) {
+ fprintf(u->errstrm, "Error: Could not open jar file: %s\n",fname);
+ exit(3); // Called only from the native standalone unpacker
+ }
+ }
+}
+
+// Add a ZIP entry and copy the file data
+void jar::addJarEntry(const char* fname,
+ bool deflate_hint, int modtime,
+ bytes& head, bytes& tail) {
+ int len = (int)(head.len + tail.len);
+ int clen = 0;
+
+ uint crc = get_crc32(0,Z_NULL,0);
+ if (head.len != 0)
+ crc = get_crc32(crc, (uchar *)head.ptr, (uint)head.len);
+ if (tail.len != 0)
+ crc = get_crc32(crc, (uchar *)tail.ptr, (uint)tail.len);
+
+ bool deflate = (deflate_hint && len > 0);
+
+ if (deflate) {
+ if (deflate_bytes(head, tail) == false) {
+ PRINTCR((2, "Reverting to store fn=%s\t%d -> %d\n",
+ fname, len, deflated.size()));
+ deflate = false;
+ }
+ }
+ clen = (int)((deflate) ? deflated.size() : len);
+ add_to_jar_directory(fname, !deflate, modtime, len, clen, crc);
+ write_jar_header( fname, !deflate, modtime, len, clen, crc);
+
+ if (deflate) {
+ write_data(deflated.b);
+ // Write deflated information in extra header
+ write_jar_extra(len, clen, crc);
+ } else {
+ write_data(head);
+ write_data(tail);
+ }
+}
+
+// Add a ZIP entry for a directory name no data
+void jar::addDirectoryToJarFile(const char* dir_name) {
+ bool store = true;
+ add_to_jar_directory((const char*)dir_name, store, default_modtime, 0, 0, 0);
+ write_jar_header( (const char*)dir_name, store, default_modtime, 0, 0, 0);
+}
+
+// Write out the central directory and close the jar file.
+void jar::closeJarFile(bool central) {
+ if (jarfp) {
+ fflush(jarfp);
+ if (central) write_central_directory();
+ fflush(jarfp);
+ fclose(jarfp);
+ PRINTCR((2, "jar::closeJarFile:closed jar-file\n"));
+ }
+ reset();
+}
+
+/* Convert the date y/n/d and time h:m:s to a four byte DOS date and
+ * time (date in high two bytes, time in low two bytes allowing magnitude
+ * comparison).
+ */
+inline
+uLong jar::dostime(int y, int n, int d, int h, int m, int s) {
+ return y < 1980 ? dostime(1980, 1, 1, 0, 0, 0) :
+ (((uLong)y - 1980) << 25) | ((uLong)n << 21) | ((uLong)d << 16) |
+ ((uLong)h << 11) | ((uLong)m << 5) | ((uLong)s >> 1);
+}
+
+#ifdef _REENTRANT // solaris
+extern "C" struct tm *gmtime_r(const time_t *, struct tm *);
+#else
+#define gmtime_r(t, s) gmtime(t)
+#endif
+/*
+ * Return the Unix time in DOS format
+ */
+uLong jar::get_dostime(int modtime) {
+ // see defines.h
+ if (modtime != 0 && modtime == modtime_cache)
+ return dostime_cache;
+ if (modtime != 0 && default_modtime == 0)
+ default_modtime = modtime; // catch a reasonable default
+ time_t t = modtime;
+ struct tm sbuf;
+ (void)memset((void*)&sbuf,0, sizeof(sbuf));
+ struct tm* s = gmtime_r(&t, &sbuf);
+ if (s == NULL) {
+ fprintf(u->errstrm, "Error: gmtime failure, invalid input archive\n");
+ exit(-1);
+ }
+ modtime_cache = modtime;
+ dostime_cache = dostime(s->tm_year + 1900, s->tm_mon + 1, s->tm_mday,
+ s->tm_hour, s->tm_min, s->tm_sec);
+ //printf("modtime %d => %d\n", modtime_cache, dostime_cache);
+ return dostime_cache;
+}
+
+
+
+#ifndef NO_ZLIB
+
+/* Returns true on success, and will set the clen to the compressed
+ length, the caller should verify if true and clen less than the
+ input data
+*/
+bool jar::deflate_bytes(bytes& head, bytes& tail) {
+ int len = (int)(head.len + tail.len);
+
+ z_stream zs;
+ BYTES_OF(zs).clear();
+
+ // NOTE: the window size should always be -MAX_WBITS normally -15.
+ // unzip/zipup.c and java/Deflater.c
+
+ int error = deflateInit2(&zs, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
+ -MAX_WBITS, 8, Z_DEFAULT_STRATEGY);
+ if (error != Z_OK) {
+ switch (error) {
+ case Z_MEM_ERROR:
+ PRINTCR((2, "Error: deflate error : Out of memory \n"));
+ break;
+ case Z_STREAM_ERROR:
+ PRINTCR((2,"Error: deflate error : Invalid compression level \n"));
+ break;
+ case Z_VERSION_ERROR:
+ PRINTCR((2,"Error: deflate error : Invalid version\n"));
+ break;
+ default:
+ PRINTCR((2,"Error: Internal deflate error error = %d\n", error));
+ }
+ return false;
+ }
+
+ deflated.empty();
+ zs.next_out = (uchar*) deflated.grow(add_size(len, (len/2)));
+ zs.avail_out = (int)deflated.size();
+
+ zs.next_in = (uchar*)head.ptr;
+ zs.avail_in = (int)head.len;
+
+ bytes* first = &head;
+ bytes* last = &tail;
+ if (last->len == 0) {
+ first = null;
+ last = &head;
+ } else if (first->len == 0) {
+ first = null;
+ }
+
+ if (first != null && error == Z_OK) {
+ zs.next_in = (uchar*) first->ptr;
+ zs.avail_in = (int)first->len;
+ error = deflate(&zs, Z_NO_FLUSH);
+ }
+ if (error == Z_OK) {
+ zs.next_in = (uchar*) last->ptr;
+ zs.avail_in = (int)last->len;
+ error = deflate(&zs, Z_FINISH);
+ }
+ if (error == Z_STREAM_END) {
+ if ((int)zs.total_out > 0) {
+ // Even if compressed size is bigger than uncompressed, write it
+ PRINTCR((2, "deflate compressed data %d -> %d\n", len, zs.total_out));
+ deflated.b.len = zs.total_out;
+ deflateEnd(&zs);
+ return true;
+ }
+ PRINTCR((2, "deflate expanded data %d -> %d\n", len, zs.total_out));
+ deflateEnd(&zs);
+ return false;
+ }
+
+ deflateEnd(&zs);
+ PRINTCR((2, "Error: deflate error deflate did not finish error=%d\n",error));
+ return false;
+}
+
+// Callback for fetching data from a GZIP input stream
+static jlong read_input_via_gzip(unpacker* u,
+ void* buf, jlong minlen, jlong maxlen) {
+ assert(minlen <= maxlen); // don't talk nonsense
+ jlong numread = 0;
+ char* bufptr = (char*) buf;
+ char* inbuf = u->gzin->inbuf;
+ size_t inbuflen = sizeof(u->gzin->inbuf);
+ unpacker::read_input_fn_t read_gzin_fn =
+ (unpacker::read_input_fn_t) u->gzin->read_input_fn;
+ z_stream& zs = *(z_stream*) u->gzin->zstream;
+ while (numread < minlen) {
+ int readlen = (1 << 16); // pretty arbitrary
+ if (readlen > (maxlen - numread))
+ readlen = (int)(maxlen - numread);
+ zs.next_out = (uchar*) bufptr;
+ zs.avail_out = readlen;
+ if (zs.avail_in == 0) {
+ zs.avail_in = (int) read_gzin_fn(u, inbuf, 1, inbuflen);
+ zs.next_in = (uchar*) inbuf;
+ }
+ int error = inflate(&zs, Z_NO_FLUSH);
+ if (error != Z_OK && error != Z_STREAM_END) {
+ u->abort("error inflating input");
+ break;
+ }
+ int nr = readlen - zs.avail_out;
+ u->gzin->gzlen += nr;
+ u->gzin->gzcrc = crc32(u->gzin->gzcrc, (const unsigned char *)bufptr, nr);
+ numread += nr;
+ bufptr += nr;
+ assert(numread <= maxlen);
+ if (error == Z_STREAM_END) {
+ enum { TRAILER_LEN = 8 };
+ // skip 8-byte trailer
+ if (zs.avail_in >= TRAILER_LEN) {
+ zs.avail_in -= TRAILER_LEN;
+ } else {
+ // Bug: 5023768,we read past the TRAILER_LEN to see if there is
+ // any extraneous data, as we don't support concatenated .gz files.
+ int extra = (int) read_gzin_fn(u, inbuf, 1, inbuflen);
+ zs.avail_in += extra - TRAILER_LEN;
+ }
+ // %%% should check for concatenated *.gz files here
+ if (zs.avail_in > 0)
+ u->abort("garbage after end of deflated input stream");
+
+ // at this point we know there are no trailing bytes,
+ // we are safe to get the crc and len.
+ if (u->gzin->gzcrc != 0) {
+ // Read the CRC information from the gzip container
+ fseek(u->infileptr, -TRAILER_LEN, SEEK_END);
+ uint filecrc;
+ uint filelen;
+ fread(&filecrc, sizeof(filecrc), 1, u->infileptr);
+ fread(&filelen, sizeof(filelen), 1, u->infileptr);
+ filecrc = SWAP_INT(filecrc);
+ filelen = SWAP_INT(filelen);
+ if (u->gzin->gzcrc != filecrc ||
+ // rfc1952; ISIZE is the input size modulo 2^32
+ u->gzin->gzlen != (filelen & 0xffffffff)) { // CRC error
+
+ PRINTCR((1, "crc: 0x%x 0x%x\n", u->gzin->gzcrc, filecrc));
+ PRINTCR((1, "len: 0x%x 0x%x\n", u->gzin->gzlen, filelen));
+
+ if (u->jarout != null) {
+ // save the file name first, if any
+ const char* outfile = u->jarout->jarname;
+ u->jarout->closeJarFile(false);
+ if (outfile != null) {
+ remove(outfile);
+ }
+ }
+ // Print out the error and exit with return code != 0
+ u->abort("CRC error, invalid compressed data.");
+ }
+ }
+ // pop this filter off:
+ u->gzin->free();
+ break;
+ }
+ }
+
+ //fprintf(u->errstrm, "readInputFn(%d,%d) => %d (gunzip)\n",
+ // (int)minlen, (int)maxlen, (int)numread);
+ return numread;
+}
+
+void gunzip::init(unpacker* u_) {
+ BYTES_OF(*this).clear();
+ u = u_;
+ assert(u->gzin == null); // once only, please
+ read_input_fn = (void*)u->read_input_fn;
+ zstream = NEW(z_stream, 1);
+ u->gzin = this;
+ u->read_input_fn = read_input_via_gzip;
+ u->gzin->gzcrc = crc32(0, Z_NULL, 0);
+ u->gzin->gzlen = 0;
+}
+
+void gunzip::start(int magic) {
+ assert((magic & GZIP_MAGIC_MASK) == GZIP_MAGIC);
+ int gz_flg = (magic & 0xFF); // keep "flg", discard other 3 bytes
+ enum {
+ FHCRC = (1<<1),
+ FEXTRA = (1<<2),
+ FNAME = (1<<3),
+ FCOMMENT = (1<<4)
+ };
+ char gz_mtime[4];
+ char gz_xfl[1];
+ char gz_os[1];
+ char gz_extra_len[2];
+ char gz_hcrc[2];
+ char gz_ignore;
+ // do not save extra, name, comment
+ read_fixed_field(gz_mtime, sizeof(gz_mtime));
+ read_fixed_field(gz_xfl, sizeof(gz_xfl));
+ read_fixed_field(gz_os, sizeof(gz_os));
+ if (gz_flg & FEXTRA) {
+ read_fixed_field(gz_extra_len, sizeof(gz_extra_len));
+ int extra_len = gz_extra_len[0] & 0xFF;
+ extra_len += (gz_extra_len[1] & 0xFF) << 8;
+ for (; extra_len > 0; extra_len--) {
+ read_fixed_field(&gz_ignore, 1);
+ }
+ }
+ int null_terms = 0;
+ if (gz_flg & FNAME) null_terms++;
+ if (gz_flg & FCOMMENT) null_terms++;
+ for (; null_terms; null_terms--) {
+ for (;;) {
+ gz_ignore = 0;
+ read_fixed_field(&gz_ignore, 1);
+ if (gz_ignore == 0) break;
+ }
+ }
+ if (gz_flg & FHCRC)
+ read_fixed_field(gz_hcrc, sizeof(gz_hcrc));
+
+ if (aborting()) return;
+
+ // now the input stream is ready to read into the inflater
+ int error = inflateInit2((z_stream*) zstream, -MAX_WBITS);
+ if (error != Z_OK) { abort("cannot create input"); return; }
+}
+
+void gunzip::free() {
+ assert(u->gzin == this);
+ u->gzin = null;
+ u->read_input_fn = (unpacker::read_input_fn_t) this->read_input_fn;
+ inflateEnd((z_stream*) zstream);
+ mtrace('f', zstream, 0);
+ ::free(zstream);
+ zstream = null;
+ mtrace('f', this, 0);
+ ::free(this);
+}
+
+void gunzip::read_fixed_field(char* buf, size_t buflen) {
+ if (aborting()) return;
+ jlong nr = ((unpacker::read_input_fn_t)read_input_fn)
+ (u, buf, buflen, buflen);
+ if ((size_t)nr != buflen)
+ u->abort("short stream header");
+}
+
+#else // NO_ZLIB
+
+void gunzip::free() {
+}
+
+#endif // NO_ZLIB