141,6 → 141,7 |
|
if ($version == 2) { |
// Get CRC32 |
// TODO: is this correct? or do we need to read 'H8' ? |
fseek($fp, $fanout_offset + 4*256 + 20*$num_objects + 4*$object_no); |
$crc32 = unpack('N', fread($fp,4))[1]; |
if ($debug) echo "CRC32 = ".sprintf('0x%08x',$crc32)."\n"; |
175,7 → 176,7 |
fseek($fp, $pack_offset); |
$size_info = unpack('C', fread($fp,1))[1]; |
|
$type = ($size_info & 0xE0) >> 5; /*0b11100000*/ |
$type = ($size_info & 0x70) >> 4; /*0b01110000*/ |
switch ($type) { |
case 1: |
if ($debug) echo "Type = OBJ_COMMIT ($type)\n"; |
201,21 → 202,31 |
} |
|
// Find out size |
$size = $size_info & 0x1F /*0x00011111*/; |
$shift_info = 5; |
do { |
$size = $size_info & 0xF /*0x00001111*/; |
$shift_info = 4; |
while ($size_info >= 0x80) { |
$size_info = unpack('C', fread($fp,1))[1]; |
$size = (($size_info & 0x7F) << $shift_info) + $size; |
$shift_info += 8; |
} while ($size_info >= 0x80); |
$shift_info += 7; |
} |
|
// TODO: Is this the packed or unpacked size? http://driusan.github.io/git-pack.html |
if ($debug) echo "Packed size = ".sprintf('0x%x',$size)."\n"; |
|
// Read delta base type |
if ($type == 6/*OBJ_OFS_DELTA*/) { |
// "a negative relative offset from the delta object's position in the pack if this is an OBJ_OFS_DELTA object" |
$delta_info = unpack('C*', fread($fp,4))[1]; |
if ($debug) echo "Delta negative offset: $delta_info\n"; |
|
// Offset encoding |
$offset = 0; |
$shift_info = 0; |
do { |
$offset_info = unpack('C', fread($fp,1))[1]; |
$offset = (($offset_info & 0x7F) << $shift_info) + $offset; |
$shift_info += 7; |
} while ($offset_info >= 0x80); |
|
if ($debug) echo "Delta negative offset: $offset\n"; |
throw new Exception("OBJ_OFS_DELTA is currently not implemented"); // TODO! Implement OBJ_OFS_DELTA! |
} |
if ($type == 7/*OBJ_REF_DELTA*/) { |
238,7 → 249,7 |
|
// Check CRC32 |
// TODO: Does not fit; neither crc32, nor crc32b... |
// if ($debug) echo "CRC32 found = 0x".hash('crc32',$compressed)."\n"; |
// if ($debug) echo "CRC32 found = 0x".hash('crc32',$compressed)." vs $crc32\n"; |
|
return $uncompressed; |
} |