155 * Converts Java time to DOS time, encoding any milliseconds lost
156 * in the conversion into the upper half of the returned long.
157 *
158 * @param time milliseconds since epoch
159 * @return DOS time with 2s remainder encoded into upper half
160 */
161 public static long javaToExtendedDosTime(long time) {
162 if (time < 0) {
163 return ZipEntry.DOSTIME_BEFORE_1980;
164 }
165 long dostime = javaToDosTime(time);
166 return (dostime != ZipEntry.DOSTIME_BEFORE_1980)
167 ? dostime + ((time % 2000) << 32)
168 : ZipEntry.DOSTIME_BEFORE_1980;
169 }
170
171 /**
172 * Fetches unsigned 16-bit value from byte array at specified offset.
173 * The bytes are assumed to be in Intel (little-endian) byte order.
174 */
175 public static final int get16(byte b[], int off) {
176 return (b[off] & 0xff) | ((b[off + 1] & 0xff) << 8);
177 }
178
179 /**
180 * Fetches unsigned 32-bit value from byte array at specified offset.
181 * The bytes are assumed to be in Intel (little-endian) byte order.
182 */
183 public static final long get32(byte b[], int off) {
184 return (get16(b, off) | ((long)get16(b, off+2) << 16)) & 0xffffffffL;
185 }
186
187 /**
188 * Fetches signed 64-bit value from byte array at specified offset.
189 * The bytes are assumed to be in Intel (little-endian) byte order.
190 */
191 public static final long get64(byte b[], int off) {
192 return get32(b, off) | (get32(b, off+4) << 32);
193 }
194
195 /**
196 * Fetches signed 32-bit value from byte array at specified offset.
197 * The bytes are assumed to be in Intel (little-endian) byte order.
198 *
199 */
200 public static final int get32S(byte b[], int off) {
201 return (get16(b, off) | (get16(b, off+2) << 16));
202 }
203
204 // fields access methods
205 static final int CH(byte[] b, int n) {
206 return b[n] & 0xff ;
207 }
208
209 static final int SH(byte[] b, int n) {
210 return (b[n] & 0xff) | ((b[n + 1] & 0xff) << 8);
211 }
212
213 static final long LG(byte[] b, int n) {
214 return ((SH(b, n)) | (SH(b, n + 2) << 16)) & 0xffffffffL;
215 }
216
217 static final long LL(byte[] b, int n) {
218 return (LG(b, n)) | (LG(b, n + 4) << 32);
219 }
220
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155 * Converts Java time to DOS time, encoding any milliseconds lost
156 * in the conversion into the upper half of the returned long.
157 *
158 * @param time milliseconds since epoch
159 * @return DOS time with 2s remainder encoded into upper half
160 */
161 public static long javaToExtendedDosTime(long time) {
162 if (time < 0) {
163 return ZipEntry.DOSTIME_BEFORE_1980;
164 }
165 long dostime = javaToDosTime(time);
166 return (dostime != ZipEntry.DOSTIME_BEFORE_1980)
167 ? dostime + ((time % 2000) << 32)
168 : ZipEntry.DOSTIME_BEFORE_1980;
169 }
170
171 /**
172 * Fetches unsigned 16-bit value from byte array at specified offset.
173 * The bytes are assumed to be in Intel (little-endian) byte order.
174 */
175 public static final int get16(byte[] b, int off) {
176 return (b[off] & 0xff) | ((b[off + 1] & 0xff) << 8);
177 }
178
179 /**
180 * Fetches unsigned 32-bit value from byte array at specified offset.
181 * The bytes are assumed to be in Intel (little-endian) byte order.
182 */
183 public static final long get32(byte[] b, int off) {
184 return (get16(b, off) | ((long)get16(b, off+2) << 16)) & 0xffffffffL;
185 }
186
187 /**
188 * Fetches signed 64-bit value from byte array at specified offset.
189 * The bytes are assumed to be in Intel (little-endian) byte order.
190 */
191 public static final long get64(byte[] b, int off) {
192 return get32(b, off) | (get32(b, off+4) << 32);
193 }
194
195 /**
196 * Fetches signed 32-bit value from byte array at specified offset.
197 * The bytes are assumed to be in Intel (little-endian) byte order.
198 *
199 */
200 public static final int get32S(byte[] b, int off) {
201 return (get16(b, off) | (get16(b, off+2) << 16));
202 }
203
204 // fields access methods
205 static final int CH(byte[] b, int n) {
206 return b[n] & 0xff ;
207 }
208
209 static final int SH(byte[] b, int n) {
210 return (b[n] & 0xff) | ((b[n + 1] & 0xff) << 8);
211 }
212
213 static final long LG(byte[] b, int n) {
214 return ((SH(b, n)) | (SH(b, n + 2) << 16)) & 0xffffffffL;
215 }
216
217 static final long LL(byte[] b, int n) {
218 return (LG(b, n)) | (LG(b, n + 4) << 32);
219 }
220
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