Bug 681: Add Basic ELF Header + ARM EABI Section Parsing, allowing to distinguish ARM soft-float/hard-float (part-1)

https://jogamp.org/bugzilla/show_bug.cgi?id=681

+ * References:
+ * <ul>
+ *   <li>http://linux.die.net/man/5/elf</li>
+ *   <li>http://www.sco.com/developers/gabi/latest/contents.html</li>
+ *   <li>http://infocenter.arm.com/
+ *   <ul>
+ *      <li>ARM IHI 0044E, current through ABI release 2.09</li>
+ *      <li>ARM IHI 0045D, current through ABI release 2.09</li>
+ *   </ul></li>

Added self contained jogamp.common.os.elf package w/ entry point class ElfHeader
to read a RandomAccessFile and parse it as an ELF file.

ELF Parsing completness:
  - Header: OK
  - SectionHeader: OK
  - Section Type SHT_ARM_ATTRIBUTES: OK
     - Will be read into SectionArmAttributes
     - Used to distinguisgh soft/hard VFP float

Tested manually on:
  - Linux intel 32bit / 64bit, arm soft-float and hard-float

1 files changed, 574 insertions, 0 deletions

diff --git a/src/java/jogamp/common/os/elf/ElfHeader.java b/src/java/jogamp/common/os/elf/ElfHeader.java
new file mode 100644
index 0000000..85bdcf0
--- /dev/null
+++ b/src/java/jogamp/common/os/elf/ElfHeader.java
@@ -0,0 +1,574 @@
+/**
+ * Copyright 2013 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ *
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+package jogamp.common.os.elf;
+
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.nio.ByteBuffer;
+
+import static jogamp.common.os.elf.IOUtils.readBytes;
+import static jogamp.common.os.elf.IOUtils.seek;
+import static jogamp.common.os.elf.IOUtils.shortToInt;
+
+/**
+ * ELF ABI Header
+ * <p>
+ * References:
+ * <ul>
+ *   <li>http://linux.die.net/man/5/elf</li>
+ *   <li>http://www.sco.com/developers/gabi/latest/contents.html</li>
+ *   <li>http://infocenter.arm.com/
+ *   <ul>
+ *      <li>ARM IHI 0044E, current through ABI release 2.09</li>
+ *   </ul></li>
+ * </ul>
+ * </p>
+ */
+public class ElfHeader {
+    /** Size of e_ident array - {@value} */
+    public static int EI_NIDENT = 16;
+    
+    /** ident byte #0 - {@value} */
+    public static final byte ELFMAG0 = 0x7f;
+    /** ident byte #1 - {@value} */
+    public static final byte ELFMAG1 = 'E';
+    /** ident byte #2 - {@value} */
+    public static final byte ELFMAG2 = 'L';
+    /** ident byte #3 - {@value} */
+    public static final byte ELFMAG3 = 'F';
+    
+    /** ident byte #4 */
+    public static final int EI_CLASS = 4;
+    public static final byte ELFCLASSNONE = 0;
+    public static final byte ELFCLASS32 = 1;
+    public static final byte ELFCLASS64 = 2;
+    
+    /** ident byte #5 */
+    public static final int EI_DATA = 5;
+    public static final byte ELFDATANONE = 0;
+    public static final byte ELFDATA2LSB = 1;
+    public static final byte ELFDATA2MSB = 2;
+
+    /** ident byte #6 */
+    public static final int EI_VERSION = 6;
+    public static final byte EV_NONE = 0;
+    public static final byte EV_CURRENT = 1;
+    
+    /** ident byte #7 */
+    public static final int EI_OSABI = 7;
+    /** Unix System V ABI - {@value} */
+    public static final byte ELFOSABI_SYSV = 0;
+    public static final byte ELFOSABI_NONE = ELFOSABI_SYSV;
+    /** HP-UX ABI - {@value} */
+    public static final byte ELFOSABI_HPUX = 1;
+    /** NetBSD ABI - {@value} **/
+    public static final byte ELFOSABI_NETBSD = 2;
+    /** Linux ABI - {@value} **/
+    public static final byte ELFOSABI_LINUX = 3;
+    /** Solaris ABI - {@value} **/
+    public static final byte ELFOSABI_SOLARIS = 6;
+    /** IRIX ABI - {@value} **/
+    public static final byte ELFOSABI_IRIX = 7;
+    /** FreeBSD ABI - {@value} **/
+    public static final byte ELFOSABI_FREEBSD = 8;
+    /** ARM architecture ABI - {@value} **/
+    public static final byte ELFOSABI_ARM = 8; // FIXME
+    /** Stand-alone (embedded) ABI - {@value} **/
+    public static final byte ELFOSABI_STANDALONE = 9; // FIXME
+    /** TRU64 UNIX ABI - {@value} **/
+    public static final byte ELFOSABI_TRU64 = 10;
+    /** Novell Modesto ABI - {@value} **/
+    public static final byte ELFOSABI_MODESTO = 11;
+    /** Open BSD ABI - {@value} **/
+    public static final byte ELFOSABI_OPENBSD = 12;
+    /** Open VMS ABI - {@value} **/
+    public static final byte ELFOSABI_OPENVMS = 13;
+    /** Hewlett-Packard Non-Stop Kernel ABI - {@value} **/
+    public static final byte ELFOSABI_NSK     = 14;
+    /** Amiga Research OS ABI - {@value} **/
+    public static final byte ELFOSABI_AROS    = 15;
+    /** The FenixOS highly scalable multi-core OS 64-255 Architecture-specific value range - {@value} */
+    public static final byte ELFOSABI_FENIXOS = 16; 
+    
+    /** ident byte #8
+     * <p>
+     * This byte identifies the version of the ABI to which the object is targeted. 
+     * This field is used to distinguish among incompatible versions of an ABI. 
+     * The interpretation of this version number is dependent on the ABI identified by the EI_OSABI field. 
+     * Applications conforming to this specification use the value 0.
+     * </p> 
+     */
+    public static final int EI_ABIVERSION = 8;
+    
+    /**
+     * ident byte #9 .. ?
+     * <p>
+     * Start of padding. 
+     * These bytes are reserved and set to zero. 
+     * Programs which read them should ignore them. 
+     * The value for EI_PAD will change in the future if currently unused bytes are given meanings.
+     * </p>
+     */
+    public static final int EI_PAD = 9;
+    
+    /**
+     * This masks an 8-bit version number, the version of the ABI to which this
+     * ELF file conforms. This ABI is version 5. A value of 0 denotes unknown conformance.
+     * {@value}
+     */
+    public static final int EF_ARM_ABIMASK  = 0xFF000000;
+    public static final int EF_ARM_ABISHIFT  = 24;
+    
+    /**
+     * ARM ABI version 5.
+     * {@value}
+     */
+    public static final int EF_ARM_ABI5  = 0x05000000;
+    
+    /**
+     * The ELF file contains BE-8 code, suitable for execution on an ARM
+     * Architecture v6 processor. This flag must only be set on an executable file.
+     * {@value}
+     */
+    public static final int EF_ARM_BE8      = 0x00800000;
+    
+    /**
+     * Legacy code (ABI version 4 and earlier) generated by gcc-arm-xxx might
+     * use these bits.
+     * {@value}
+     */
+    public static final int EF_ARM_GCCMASK  = 0x00400FFF;
+    
+    /**
+     * Set in executable file headers (e_type = ET_EXEC or ET_DYN) to note that
+     * the executable file was built to conform to the hardware floating-point
+     * procedure-call standard.
+     * <p>
+     * Compatible with legacy (pre version 5) gcc use as EF_ARM_VFP_FLOAT.
+     * </p>
+     * <p>
+     * Note: This is not used (anymore) 
+     * </p> 
+     * {@value}
+     */
+    public static final int EF_ARM_ABI_FLOAT_HARD  = 0x00000400;
+    
+    /**
+     * Set in executable file headers (e_type = ET_EXEC or ET_DYN) to note
+     * explicitly that the executable file was built to conform to the software
+     * floating-point procedure-call standard (the base standard). If both
+     * {@link #EF_ARM_ABI_FLOAT_HARD} and {@link #EF_ARM_ABI_FLOAT_SOFT} are clear, 
+     * conformance to the base procedure-call standard is implied.
+     * <p>
+     * Compatible with legacy (pre version 5) gcc use as EF_ARM_SOFT_FLOAT.
+     * </p>
+     * <p>
+     * Note: This is not used (anymore) 
+     * </p> 
+     * {@value}
+     */
+    public static final int EF_ARM_ABI_FLOAT_SOFT  = 0x00000200;
+    
+    /** An unknown type - {@value} */
+    public static final short ET_NONE   = 0;
+    /** A relocatable file - {@value} */
+    public static final short ET_REL    = 1;
+    /** An executable file - {@value} */
+    public static final short ET_EXEC   = 2;
+    /** A shared object - {@value} */
+    public static final short ET_DYN    = 3;
+    /** A core file - {@value} */
+    public static final short ET_CORE   = 4;
+    
+    public static final short EM_NONE = 0;
+    public static final short EM_M32 = 1;
+    public static final short EM_SPARC = 2;
+    public static final short EM_386 = 3;
+    public static final short EM_68K = 4;
+    public static final short EM_88K = 5;
+    public static final short EM_486 = 6;
+    public static final short EM_860 = 7;
+    public static final short EM_MIPS = 8;
+    public static final short EM_S370 = 9;
+    public static final short EM_MIPS_RS3_LE = 10;
+    public static final short EM_PARISC = 15;
+    public static final short EM_res016 = 16;
+    public static final short EM_VPP550 = 17;
+    public static final short EM_SPARC32PLUS = 18;
+    public static final short EM_960 = 19;
+    public static final short EM_PPC = 20;
+    public static final short EM_PPC64 = 21;
+    public static final short EM_S390 = 22;
+    public static final short EM_SPU = 23;
+    public static final short EM_V800 = 36;
+    public static final short EM_FR20 = 37;
+    public static final short EM_RH32 = 38;
+    public static final short EM_MCORE = 39;
+    public static final short EM_RCE = 39;
+    public static final short EM_ARM = 40;
+    public static final short EM_OLD_ALPHA = 41;
+    public static final short EM_SH = 42;
+    public static final short EM_SPARCV9 = 43;
+    public static final short EM_TRICORE = 44;
+    public static final short EM_ARC = 45;
+    public static final short EM_H8_300 = 46;
+    public static final short EM_H8_300H = 47;
+    public static final short EM_H8S = 48;
+    public static final short EM_H8_500 = 49;
+    public static final short EM_IA_64 = 50;
+    public static final short EM_MIPS_X = 51;
+    public static final short EM_COLDFIRE = 52;
+    public static final short EM_68HC12 = 53;
+    public static final short EM_MMA = 54;
+    public static final short EM_PCP = 55;
+    public static final short EM_NCPU = 56;
+    public static final short EM_NDR1 = 57;
+    public static final short EM_STARCORE = 58;
+    public static final short EM_ME16 = 59;
+    public static final short EM_ST100 = 60;
+    public static final short EM_TINYJ = 61;
+    public static final short EM_X86_64 = 62;
+    public static final short EM_PDSP = 63;
+    public static final short EM_PDP10 = 64;
+    public static final short EM_PDP11 = 65;
+    public static final short EM_FX66 = 66;
+    public static final short EM_ST9PLUS = 67;
+    public static final short EM_ST7 = 68;
+    public static final short EM_68HC16 = 69;
+    public static final short EM_68HC11 = 70;
+    public static final short EM_68HC08 = 71;
+    public static final short EM_68HC05 = 72;
+    public static final short EM_SVX = 73;
+    public static final short EM_ST19 = 74;
+    public static final short EM_VAX = 75;
+    public static final short EM_CRIS = 76;
+    public static final short EM_JAVELIN = 77;
+    public static final short EM_FIREPATH = 78;
+    public static final short EM_ZSP = 79;
+    public static final short EM_MMIX = 80;
+    public static final short EM_HUANY = 81;
+    public static final short EM_PRISM = 82;
+    public static final short EM_AVR = 83;
+    public static final short EM_FR30 = 84;
+    public static final short EM_D10V = 85;
+    public static final short EM_D30V = 86;
+    public static final short EM_V850 = 87;
+    public static final short EM_M32R = 88;
+    public static final short EM_MN10300 = 89;
+    public static final short EM_MN10200 = 90;
+    public static final short EM_PJ = 91;
+    public static final short EM_OPENRISC = 92;
+    public static final short EM_ARC_A5 = 93;
+    public static final short EM_XTENSA = 94;
+    public static final short EM_VIDEOCORE = 95;
+    public static final short EM_TMM_GPP = 96;
+    public static final short EM_NS32K = 97;
+    public static final short EM_TPC = 98;
+    public static final short EM_SNP1K = 99;
+    public static final short EM_ST200 = 100;
+    public static final short EM_IP2K = 101;
+    public static final short EM_MAX = 102;
+    public static final short EM_CR = 103;
+    public static final short EM_F2MC16 = 104;
+    public static final short EM_MSP430 = 105;
+    public static final short EM_BLACKFIN = 106;
+    public static final short EM_SE_C33 = 107;
+    public static final short EM_SEP = 108;
+    public static final short EM_ARCA = 109;
+    public static final short EM_UNICORE = 110;
+    public static final short EM_EXCESS = 111;
+    public static final short EM_DXP = 112;
+    public static final short EM_ALTERA_NIOS2 = 113;
+    public static final short EM_CRX = 114;
+    public static final short EM_XGATE = 115;
+    public static final short EM_C166 = 116;
+    public static final short EM_M16C = 117;
+    public static final short EM_DSPIC30F = 118;
+    public static final short EM_CE = 119;
+    public static final short EM_M32C = 120;
+    public static final short EM_TSK3000 = 131;
+    public static final short EM_RS08 = 132;
+    public static final short EM_res133 = 133;
+    public static final short EM_ECOG2 = 134;
+    public static final short EM_SCORE = 135;
+    public static final short EM_SCORE7 = 135;
+    public static final short EM_DSP24 = 136;
+    public static final short EM_VIDEOCORE3 = 137;
+    public static final short EM_LATTICEMICO32 = 138;
+    public static final short EM_SE_C17 = 139;
+    public static final short EM_TI_C6000 = 140;
+    public static final short EM_TI_C2000 = 141;
+    public static final short EM_TI_C5500 = 142;
+    public static final short EM_MMDSP_PLUS = 160;
+    public static final short EM_CYPRESS_M8C = 161;
+    public static final short EM_R32C = 162;
+    public static final short EM_TRIMEDIA = 163;
+    public static final short EM_QDSP6 = 164;
+    public static final short EM_8051 = 165;
+    public static final short EM_STXP7X = 166;
+    public static final short EM_NDS32 = 167;
+    public static final short EM_ECOG1 = 168;
+    public static final short EM_ECOG1X = 168;
+    public static final short EM_MAXQ30 = 169;
+    public static final short EM_XIMO16 = 170;
+    public static final short EM_MANIK = 171;
+    public static final short EM_CRAYNV2 = 172;
+    public static final short EM_RX = 173;
+    public static final short EM_METAG = 174;
+    public static final short EM_MCST_ELBRUS = 175;
+    public static final short EM_ECOG16 = 176;
+    public static final short EM_CR16 = 177;
+    public static final short EM_ETPU = 178;
+    public static final short EM_SLE9X = 179;
+    public static final short EM_L1OM = 180;
+    public static final short EM_INTEL181 = 181;
+    public static final short EM_INTEL182 = 182;
+    public static final short EM_res183 = 183;
+    public static final short EM_res184 = 184;
+    public static final short EM_AVR32 = 185;
+    public static final short EM_STM8 = 186;
+    public static final short EM_TILE64 = 187;
+    public static final short EM_TILEPRO = 188;
+    public static final short EM_MICROBLAZE = 189;
+    public static final short EM_CUDA = 190;
+    
+    public static final boolean isIdentityValid(byte[] ident) {
+        return ELFMAG0 == ident[0] &&
+               ELFMAG1 == ident[1] &&
+               ELFMAG2 == ident[2] &&
+               ELFMAG3 == ident[3] ;
+    }
+    
+    /** Public access to the raw elf header */
+    public final Ehdr d;
+    
+    /** Public access to the {@link SectionHeader} */
+    public final SectionHeader[] sht; 
+    
+    /**
+     * Note: The input stream shall stay untouch to be able to read sections!
+     * 
+     * @param in input stream of a binary file at position zero
+     * @return
+     * @throws IOException if reading from the given input stream fails or less then ELF Header size bytes 
+     * @throws IllegalArgumentException if the given input stream does not represent an ELF Header
+     */
+    public static ElfHeader read(RandomAccessFile in) throws IOException, IllegalArgumentException {
+        final int eh_sz = Ehdr.size();
+        final byte[] buf = new byte[eh_sz];
+        readBytes (in, buf, 0, eh_sz); 
+        final ElfHeader eh = new ElfHeader(ByteBuffer.wrap(buf, 0, buf.length), in);
+        return eh;
+    }
+
+    /**
+     * @param buf ELF Header bytes
+     * @throws IllegalArgumentException if the given buffer does not represent an ELF Header
+     * @throws IOException 
+     */
+    ElfHeader(java.nio.ByteBuffer buf, RandomAccessFile in) throws IllegalArgumentException, IOException {
+        d = Ehdr.create(buf);
+        if( !isIdentityValid(d.getE_ident()) ) {
+            throw new IllegalArgumentException("Buffer is not an ELF Header");
+        }
+        sht = readSectionHeaderTable(in);
+    }
+
+    public final short getSize() { return d.getE_ehsize(); }
+    
+    /** 
+     * Returns the architecture class in bits, 
+     * 32 for {@link #ELFCLASS32}, 64 for {@link #ELFCLASS64} 
+     * and 0 for {@link #ELFCLASSNONE}. 
+     */
+    public final int getArchClassBits() {
+        switch( d.getE_ident()[EI_CLASS] ) {
+            case ELFCLASS32: return 32;
+            case ELFCLASS64: return 64;
+            default: return 0;
+        }
+    }
+    
+    /** 
+     * Returns the processor's data encoding, 
+     * 1 for {@link #ELFDATA2LSB}, 2 for for {@link #ELFDATA2MSB}
+     * and 0 for for {@link #ELFDATANONE}
+     */
+    public final int getDataEncodingMode() {
+        switch( d.getE_ident()[EI_DATA] ) {
+            case ELFDATA2LSB: return 1;
+            case ELFDATA2MSB: return 2;
+            default: return 0;
+        }
+    }
+    
+    /** 3 == Linux */
+    public final byte getOSABI() {
+        return d.getE_ident()[EI_OSABI];
+    }
+
+    /** Returns the object file type */ 
+    public final short getType() {
+        return d.getE_type();
+    }
+
+    /** Returns the required architecture for the file */ 
+    public final short getMachine() {
+        return d.getE_machine();    
+    }
+    
+    /** 
+     * Returns true if {@link #getMachine() machine} is a 32 or 64 bit ARM CPU
+     * of type {@link #EM_ARM}. */
+    public final boolean isArm() {
+        return getMachine() == EM_ARM;
+    }
+    
+    /** 
+     * Returns true if {@link #getMachine() machine} is a 32 or 64 bit Intel CPU
+     * of type {@link #EM_386}, {@link #EM_486} or {@link #EM_X86_64}. */
+    public final boolean isIntel() {
+        final short m = getMachine();
+        return EM_386 == m ||
+               EM_486 == m ||
+               EM_X86_64 == m;
+    }
+    
+    /** Retruns the processor-specific flags associated with the file. */
+    public final int getFlags() {
+        return d.getE_flags();
+    }
+    
+    /** Returns the ARM EABI version from {@link #getFlags() flags}, maybe 0 if not an ARM EABI. */
+    public byte getArmABI() {
+        return (byte) ( ( ( EF_ARM_ABIMASK & d.getE_flags() ) >> EF_ARM_ABISHIFT ) & 0xff );        
+    }
+    
+    /** Returns the ARM EABI legacy GCC {@link #getFlags() flags}, maybe 0 if not an ARM EABI or not having legacy GCC flags. */
+    public int getArmLegacyGCCFlags() {
+        final int f = d.getE_flags();
+        return 0 != ( EF_ARM_ABIMASK & f ) ? ( EF_ARM_GCCMASK & f ) : 0;        
+    }
+    
+    /** 
+     * Returns the ARM EABI float mode from {@link #getFlags() flags},
+     * i.e. 1 for {@link #EF_ARM_ABI_FLOAT_SOFT}, 2 for {@link #EF_ARM_ABI_FLOAT_HARD}
+     * or 0 for none.
+     * <p>
+     * Note: This is not used (anymore) 
+     * </p> 
+     */
+    public byte getArmFloatMode() {
+        final int f = d.getE_flags();
+        if( 0 != ( EF_ARM_ABIMASK & f ) ) {
+            if( ( EF_ARM_ABI_FLOAT_HARD & f ) != 0 ) {
+                return 2;
+            }
+            if( ( EF_ARM_ABI_FLOAT_SOFT & f ) != 0 ) {
+                return 1;
+            }
+        }
+        return 0;
+    }
+
+    /** Returns the 1st occurence of matching SectionHeader {@link SectionHeader#getType() type}, or null if not exists. */
+    public final SectionHeader getSectionHeader(int type) {
+        for(int i=0; i<sht.length; i++) {
+            final SectionHeader sh = sht[i];
+            if( sh.getType() == type ) {
+                return sh;
+            }
+        }
+        return null;
+    }
+    
+    /** Returns the 1st occurence of matching SectionHeader {@link SectionHeader#getName() name}, or null if not exists. */
+    public final SectionHeader getSectionHeader(String name) {
+        for(int i=0; i<sht.length; i++) {
+            final SectionHeader sh = sht[i];
+            if( sh.getName().equals(name) ) {
+                return sh;
+            }
+        }
+        return null;
+    }
+    
+    final SectionHeader[] readSectionHeaderTable(RandomAccessFile in) throws IOException, IllegalArgumentException {
+        // positioning 
+        {
+            final long off = d.getE_shoff(); // absolute offset
+            if( 0 == off ) {
+                return new SectionHeader[0];
+            }
+            seek(in, off);
+        }
+        final SectionHeader[] sht;
+        final int strndx = d.getE_shstrndx();
+        final int size = d.getE_shentsize();
+        final int num;
+        int i;
+        if( 0 == d.getE_shnum() ) {            
+            // Read 1st table 1st and use it's sh_size
+            final byte[] buf0 = new byte[size];
+            readBytes(in, buf0, 0, size);
+            SectionHeader sh0 = new SectionHeader(buf0, 0, size, 0);
+            num = (int) sh0.d.getSh_size();
+            if( 0 >= num ) {
+                throw new IllegalArgumentException("EHdr sh_num == 0 and 1st SHdr size == 0");
+            }
+            sht = new SectionHeader[num];
+            sht[0] = sh0;
+            i=1;
+        } else {
+            num = d.getE_shnum();
+            sht = new SectionHeader[num];
+            i=0;
+        }
+        for(; i<num; i++) {
+            final byte[] buf = new byte[size];
+            readBytes(in, buf, 0, size);
+            sht[i] = new SectionHeader(buf, 0, size, i);
+        }
+        if( SectionHeader.SHN_UNDEF != strndx ) {
+            // has section name string table
+            if( shortToInt(SectionHeader.SHN_LORESERVE) <= strndx ) {
+                throw new InternalError("TODO strndx: "+SectionHeader.SHN_LORESERVE+" < "+strndx);
+            }
+            final SectionHeader strShdr = sht[strndx];
+            if( SectionHeader.SHT_STRTAB != strShdr.getType() ) {
+                throw new IllegalArgumentException("Ref. string Shdr["+strndx+"] is of type "+strShdr.d.getSh_type());
+            }
+            final Section strS = strShdr.readSection(in);
+            for(i=0; i<num; i++) {
+                sht[i].initName(strS, sht[i].d.getSh_name());
+            }
+        }
+        
+        return sht;
+    }    
+}