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<?php
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<?php
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/*
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/*
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 * PHP git functions
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 * PHP git functions
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 * Copyright 2021 Daniel Marschall, ViaThinkSoft
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 * Copyright 2021 - 2023 Daniel Marschall, ViaThinkSoft
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 * Revision 2021-12-29
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 * Revision 2023-04-09
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 *
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 * You may obtain a copy of the License at
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 *
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 *
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                if ($pack_files) foreach ($pack_files as $basename) {
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                if ($pack_files) foreach ($pack_files as $basename) {
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                        $basename = substr(basename($basename),0,strlen(basename($basename))-5);
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                        $basename = substr(basename($basename),0,strlen(basename($basename))-5);
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                        try {
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                        try {
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                                return git_read_object($commit_object,
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                                return git_read_object($commit_object,
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                                        $objects_dir.'/pack/'.$basename.'.idx',
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                                        $objects_dir.'/pack/'.$basename.'.idx',
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                                        $objects_dir.'/pack/'.$basename.'.pack',
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                                        $objects_dir.'/pack/'.$basename.'.pack'
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                                        false
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                                );
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                                );
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                        } catch (Exception $e) {
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                        } catch (Exception $e) {
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                                $last_exception = $e;
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                                $last_exception = $e;
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                        }
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                        }
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                }
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                }
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        $fp = fopen($idx_file, 'rb');
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        $fp = fopen($idx_file, 'rb');
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        if (!$fp) throw new Exception("Cannot open index file $idx_file");
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        if (!$fp) throw new Exception("Cannot open index file $idx_file");
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        // Read version
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        // Read version
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        fseek($fp, 0);
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        fseek($fp, 0);
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        $unpacked = unpack('N', fread($fp, 4)); // vorzeichenloser Long-Typ (immer 32 Bit, Byte-Folge Big-Endian)
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        $unpacked = unpack('H8', fread($fp, 4)); // H8 = 8x "Hex string, high nibble first"
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        if ($unpacked[1] === 0xFF744F63) {
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        if ($unpacked[1] === bin2hex("\377tOc")) {
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                $version = unpack('N', fread($fp, 4))[1]; // vorzeichenloser Long-Typ (immer 32 Bit, Byte-Folge Big-Endian)
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                $version = unpack('N', fread($fp, 4))[1]; // N = "unsigned long (always 32 bit, big endian byte order)"
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                $fanout_offset = 8;
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                $fanout_offset = 8;
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                if ($version != 2) throw new Exception("Version $version unknown");
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                if ($version != 2) throw new Exception("Version $version unknown");
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        } else {
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        } else {
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                $version = 1;
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                $version = 1;
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                $fanout_offset = 0;
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                $fanout_offset = 0;
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        if ($debug) echo "Packed size = ".sprintf('0x%x',$size)."\n";
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        if ($debug) echo "Packed size = ".sprintf('0x%x',$size)."\n";
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        // Read delta base type
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        // Read delta base type
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        if ($type == 6/*OBJ_OFS_DELTA*/) {
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        if ($type == 6/*OBJ_OFS_DELTA*/) {
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                // "a negative relative offset from the delta object's position in the pack
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                // "a negative relative offset from the delta object's position in the pack if this is an OBJ_OFS_DELTA object"
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                // if this is an OBJ_OFS_DELTA object"
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                $delta_info = unpack('C*', fread($fp,4))[1]; // TODO?!
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                $delta_info = unpack('C*', fread($fp,4))[1];
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                if ($debug) echo "Delta negative offset: $delta_info\n";
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                if ($debug) echo "Delta negative offset: $delta_info\n";
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                throw new Exception("OBJ_OFS_DELTA is currently not implemented"); // TODO! Implement OBJ_OFS_DELTA!
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        }
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        }
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        if ($type == 7/*OBJ_REF_DELTA*/) {
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        if ($type == 7/*OBJ_REF_DELTA*/) {
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                // "base object name if OBJ_REF_DELTA"
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                // "base object name if OBJ_REF_DELTA"
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                $delta_info = bin2hex(fread($fp,20))[1]; // TODO?!
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                $delta_info = bin2hex(fread($fp,20));
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                if ($debug) echo "Delta base object name: $delta_info\n";
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                if ($debug) echo "Delta base object name: $delta_info\n";
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                throw new Exception("OBJ_REF_DELTA is currently not implemented"); // TODO! Implement OBJ_REF_DELTA!
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        }
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        }
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        // Read compressed data
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        // Read compressed data
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        $compressed = fread($fp,$size);
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        $compressed = fread($fp,$size);
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