go-pst is a library for reading PST files (written in Go/Golang).

Last update: Dec 29, 2022

Overview

go-pst

A library for reading PST files (written in Go/Golang).

Introduction

go-pst is a library for reading PST files (written in Go/Golang).

The PFF (Personal Folder File) and OFF (Offline Folder File) format is used to store Microsoft Outlook e-mails, appointments and contacts. The PST (Personal Storage Table), OST (Offline Storage Table) and PAB (Personal Address Book) file format consist of the PFF format.

References

Documentation

Libraries

Datasets

This library is tested on the following datasets:

Implementation

This implementation is based on the references.
The source code of go-pst will reference this implementation.

File Header

Offset	Size	Value	Description
0	4	"\x21\x42\x44\x4e" (!BDN)	The signature (magic identifier).
8	2		The content type (client signature). See Content Types.
10	2		The data version (NDB version). NDB is short for node database. See Format Types.

Content Types

Value	Description
"\x53\x4d" (SM)	Used for PST files
"\x53\x4d" (SO)	Used for OST files
"\x41\x42" (AB)	Used for PAB files

Format Types

Value	Description
14	32-bit ANSI format
15	32-bit ANSI format
21	64-bit Unicode format (by Visual Recovery)
23	64-bit Unicode format
36	64-bit Unicode format with 4k

The 64-bit header data

Offset	Size	Description
224	8	The node b-tree file offset.
240	8	The block b-tree file offset.
513	1	Encryption type. See Encryption Types.

The 32-bit header data

Offset	Size	Description
188	4	The node b-tree file offset.
196	4	The block b-tree file offset.
461	1	Encryption type. See Encryption Types.

Encryption Types

Value	Identifier	Description
0x00	NDB_CRYPT_NONE	No encryption.
0x01	NDB_CRYPT_PERMUTE	Compressible encryption.
0x02	NDB_CRYPT_CYCLIC	High encryption.

The node and block b-tree

The following offsets start from the (node/block) b-tree offset.

64-bit

Offset	Size	Description
0	488	B-tree node entries (number of entries x entry size).
488	1	The number of entries.
490	1	The size of an entry.
491	1	B-tree node level. A zero value represents a leaf node. A value greater than zero represents a branch node, with the highest level representing the root.

64-bit 4k

Offset	Size	Description
0	4056	B-tree node entries (number of entries x entry size).
4056	2	The number of entries.
4060	1	The size of an entry.
4061	1	B-tree node level. A zero value represents a leaf node. A value greater than zero represents a branch node, with the highest level representing the root.

32-bit

Offset	Size	Description
0	496	B-tree node entries (number of entries x entry size).
496	1	The number of entries.
498	1	The size of an entry.
499	1	B-tree node level. A zero value represents a leaf node. A value greater than zero represents a branch node, with the highest level representing the root.

The b-tree entries

The 64-bit block b-tree branch node entry

Offset	Size	Description
0	8	The identifier of the first child node. 32-bit integer.
16	8	The file offset, points to a block b-tree branch or leaf node entry.

The 64-bit block b-tree leaf node entry

Offset	Size	Description
0	8	The identifier. 32-bit integer.
8	8	The file offset, points to a Heap-on-Node.
16	2	The size of the Heap-on-Node.

The 64-bit node b-tree leaf node entry

Offset	Size	Description
0	8	The identifier. 32-bit integer.
8	8	The node identifier of the data. This node identifier is found in the block b-tree.
16	8	The node identifier of the local descriptors. This node identifier is found in the block b-tree.

The 32-bit block b-tree branch node entry

Offset	Size	Description
0	4	The identifier of the first child node. 32-bit integer.
8	4	The file offset, points to a block b-tree branch or leaf node entry.

The 32-bit block b-tree leaf node entry

Offset	Size	Description
0	4	The identifier. 32-bit integer.
4	4	The file offset, points to a Heap-on-Node.
8	2	The size of the Heap-on-Node.

The 32-bit node b-tree leaf node entry

Offset	Size	Description
0	4	The identifier. 32-bit integer.
4	4	The node identifier of the data. This node identifier is found in the block b-tree.
8	4	The node identifier of the local descriptors. This node identifier is found in the block b-tree.

Identifier

The 32-bit integer (identifier) can be used to search for b-tree nodes.

Offset	Size	Description
0	5 bits	The identifier type.

Identifier types

Value	Identifier	Description
0	HID	Table value (or heap node)
1	INTERNAL	Internal node
2	NORMAL_FOLDER	Folder item
3	SEARCH_FOLDER	Search folder item
4	NORMAL_MESSAGE	Message item
5	ATTACHMENT	Attachment item
6	SEARCH_UPDATE_QUEUE	Queue of changed search folder items
7	SEARCH_CRITERIA_OBJECT	Search folder criteria
8	ASSOCIATED_MESSAGE	Associated contents item
10	CONTENTS_TABLE_INDEX	Unknown
11	RECEIVE_FOLDER_TABLE	Inbox item (or received folder table)
12	OUTGOING_QUEUE_TABLE	Outbox item (or outgoing queue table)
13	HIERARCHY_TABLE	Sub folders item (or hierarchy table)
14	CONTENTS_TABLE	Sub messages items (or contents table)
15	ASSOCIATED_CONTENTS_TABLE	Sub associated contents item (or associated contents table)
16	SEARCH_CONTENTS_TABLE	Search contents table
17	ATTACHMENT_TABLE	Attachments item
18	RECIPIENT_TABLE	Recipients items
19	SEARCH_TABLE_INDEX	Unknown
20		Unknown
21		Unknown
22		Unknown
23		Unknown
24		Unknown
31	LTP	Local descriptor value

Heap-on-Node

If the encryption type was set in the file header, the entire Heap-on-Node is encrypted.

Compressible encryption

Compressible encryption is a simple byte-substitution cipher with a fixed substitution table.

Heap-on-Node HID

Offset	Size	Description
0	5 bits	HID Type; MUST be set to 0 (IdentifierTypeHID) to indicate a valid HID.
0.5	11 bits	HID index. The index value that identifies an item allocated in the allocation table.
2.0	16 bits	This number indicates the index of the data block in which this heap item resides.

Heap-on-Node header

The first block contains the Heap-on-Node header.

Offset	Size	Description
0	2	The offset to the Heap-on-Node page map.
2	1	Block signature; MUST be set to 0xEC (236) to indicate a Heap-on-Node.
3	1	The table type.
4	4	HID User Root.

Heap-on-Node bitmap header

Blocks 8, 136, then every 128th contains the Heap-on-Node bitmap header (i == 8 || i >= 138 && (i - 8) / 128 == 0).

Offset	Size	Description
0	2	The offset to the Heap-on-Node page map (starting at the Heap-on-Node page header).

Heap-on-Node page header

This is only used when multiple Heap-on-Node blocks are present.

Offset	Size	Description
0	2	The offset to the Heap-on-Node page map (starting at the Heap-on-Node page header).

Heap-on-Node page map

Offset	Size	Description
0	2	Allocation count.
4	variable	Allocation table. This contains Allocation count + 1 entries. Each entry is an int (16 bit) value that is the byte offset to the beginning of the allocation. The start of this offset can be retrieved by using `page map offset + (2 * hidIndex) + 2` (page map offset plus the start of the allocation table, at the HID index offset). An extra entry exists at the Allocation count +1 position to mark the offset of the next available slot.

Table types

Table type	Description	Features
108	6c table	Has a b5 table header.
124	7c table	Has a b5 table header.
140	8c table	Has a b5 table header
156	9c table	Has a b5 table header.
165	a5 table
172	ac table	Has a b5 table header.
181	b5 table header	B-Tree on Heap
188	bc table	Property Context (PC/BTH). Has a b5 table header.
204	cc table	Unknown

B-Tree-on-Heap

B-Tree-on-Heap header

All tables should have a BTree-on-Heap header at HID 0x20 (the start offset to the BTree-on-Heap header is in the allocation table). This is the HID User Root from the Heap-on-Node header.

Offset	Size	Description
0	1	Table type. MUST be 188.
1	1	Size of the BTree Key value. MUST be 2, 4, 8 or 16.
2	1	Size of the data value. MUST be greater than zero and less than or equal to 32.
3	1	Index depth.
4	4	HID root. Points to the B-Tree-on-Heap entries (offset can be found in the allocation table).

Property Context

The property context starts at the HID root of the B-Tree-on-Heap header.

Property Context B-Tree-on-Heap Record

Offset	Size	Description
0	2	Property ID.
2	2	Property type.

Property types

Type	Value
Integer16	2
Integer32	3
Floating32	4
Floating64	5
Currency	6
FloatingTime	7
ErrorCode	10
Boolean	11
Integer64	20
String	31
String8	30
Time	64
GUID	72
ServerID	251
Restriction	253
RuleAction	254
Binary	258
MultipleInteger16	4098
MultipleInteger32	4099
MultipleFloating32	4100
MultipleFloating64	4101
MultipleCurrency	4102
MultipleFloatingTime	4103
MultipleInteger64	4116
MultipleString	4127
MultipleString8	4126
MultipleTime	4160
MultipleGUID	4168
MultipleBinary	4354
Unspecified	0
Null	1
Object	13

Contact

Feel free to contact me if you have any questions.
Name: Marten Mooij
Email: [email protected]
Phone: +31 6 30 53 47 67

License

MIT

Comments

[BUG] PST: external node, no local descriptors provided

Describe the bug After change the PST file path in the example, then go build, i got "external node, no local descriptors provided" error.

To Reproduce

I've used the same code provided in your example and test on 2 different PST file, same error.

Expected behavior

Should run without error

Stack trace

Initializing...
panic: Failed to open PST file: go-pst: external node, no local descriptors provided
github.com/mooijtech/go-pst/v5/pkg.(*File).GetHeapOnNodeReaderFromHID
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/heap_on_node.go:131
github.com/mooijtech/go-pst/v5/pkg.(*File).GetHeapOnNodeReaderFromHNID
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/heap_on_node.go:122
github.com/mooijtech/go-pst/v5/pkg.NewPropertyReader
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/property_reader.go:45
github.com/mooijtech/go-pst/v5/pkg.(*PropertyContext).GetPropertyReader
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/property_context.go:54
github.com/mooijtech/go-pst/v5/pkg.(*File).GetNameToIDMap
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/name_to_id_map.go:187
github.com/mooijtech/go-pst/v5/pkg.NewFromReaderWithBTrees
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:132
github.com/mooijtech/go-pst/v5/pkg.NewFromReader
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:52
github.com/mooijtech/go-pst/v5/pkg.NewFromFile
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:47
main.main
	/home/eviltik/toto/main.go:18
runtime.main
	/usr/local/go/src/runtime/proc.go:250
runtime.goexit
	/usr/local/go/src/runtime/asm_amd64.s:1594
github.com/mooijtech/go-pst/v5/pkg.NewPropertyReader
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/property_reader.go:48
github.com/mooijtech/go-pst/v5/pkg.(*PropertyContext).GetPropertyReader
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/property_context.go:54
github.com/mooijtech/go-pst/v5/pkg.(*File).GetNameToIDMap
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/name_to_id_map.go:187
github.com/mooijtech/go-pst/v5/pkg.NewFromReaderWithBTrees
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:132
github.com/mooijtech/go-pst/v5/pkg.NewFromReader
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:52
github.com/mooijtech/go-pst/v5/pkg.NewFromFile
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:47
main.main
	/home/eviltik/toto/main.go:18
runtime.main
	/usr/local/go/src/runtime/proc.go:250
runtime.goexit
	/usr/local/go/src/runtime/asm_amd64.s:1594
github.com/mooijtech/go-pst/v5/pkg.(*File).GetNameToIDMap
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/name_to_id_map.go:190
github.com/mooijtech/go-pst/v5/pkg.NewFromReaderWithBTrees
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:132
github.com/mooijtech/go-pst/v5/pkg.NewFromReader
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:52
github.com/mooijtech/go-pst/v5/pkg.NewFromFile
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:47
main.main
	/home/eviltik/toto/main.go:18
runtime.main
	/usr/local/go/src/runtime/proc.go:250
runtime.goexit
	/usr/local/go/src/runtime/asm_amd64.s:1594
github.com/mooijtech/go-pst/v5/pkg.NewFromReaderWithBTrees
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:135
github.com/mooijtech/go-pst/v5/pkg.NewFromReader
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:52
github.com/mooijtech/go-pst/v5/pkg.NewFromFile
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:47
main.main
	/home/eviltik/toto/main.go:18
runtime.main
	/usr/local/go/src/runtime/proc.go:250
runtime.goexit
	/usr/local/go/src/runtime/asm_amd64.s:1594


goroutine 1 [running]:
main.main()
	/home/eviltik/toto/main.go:21 +0x239

Platform (please complete the following information):

go-pst v5
go version go1.19.2 linux/amd64

bug

opened by eviltik 8

Switch b-trees to google/btree (Go 1.18, generics support)
References:

https://github.com/google/btree/issues/41

Shaving 40% Off Google’s B-Tree Implementation with Go Generics

go-pst v4 will require Go 1.18 due to generics support. Benchmarks (which will be published along with v4) show initializing the b-trees uses a bit more but searching for folders/messages uses less CPU and Memory.
opened by mooijtech 2
License Change?

Would you consider changing the License to something here? I would kindly suggest the MIT license.

pkg.go.dev won't even show documentation for this package since you're using WTFPL, and I imagine it's going to limit it's use in some projects. I'd love to add PST support to my own eml2html package.

Thanks for the work in this package and considering this request.

Edit: I noticed the badge on the README actually says MIT, but that doesn't match what's in the actual LICENSE.txt file. Maybe this is just an oversight?

opened by korylprince 2
Update module golang.org/x/text to v0.6.0
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opened by renovate[bot] 0
Update module github.com/tinylib/msgp to v1.1.8
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opened by renovate[bot] 0
Update module github.com/tinylib/msgp to v1.1.7
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tinylib/msgp

v1.1.7

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opened by renovate[bot] 0
Update module github.com/tidwall/btree to v1.6.0
This PR contains the following updates:

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tidwall/btree

v1.6.0

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opened by renovate[bot] 0
Update module golang.org/x/text to v0.5.0
This PR contains the following updates:

| Package | Type | Update | Change | |---|---|---|---| | golang.org/x/text | require | minor | v0.4.0 -> v0.5.0 |

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golang/text

v0.5.0

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opened by renovate[bot] 0
Update module github.com/tidwall/btree to v1.5.2
This PR contains the following updates:

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tidwall/btree

v1.5.2

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opened by renovate[bot] 0
Update module github.com/tidwall/btree to v1.5.1
This PR contains the following updates:

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tidwall/btree

v1.5.1

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opened by renovate[bot] 0
Update module github.com/tidwall/btree to v1.5.0
This PR contains the following updates:

| Package | Type | Update | Change | |---|---|---|---| | github.com/tidwall/btree | require | minor | v1.4.4 -> v1.5.0 |

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tidwall/btree

v1.5.0

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opened by renovate[bot] 0
Load messages from file offset

go-pst should expose file offsets to messages and be able to load Message structs from this offset. This would bypass the b-tree and is useful for indexing.

opened by mooijtech 0
B-Tree improvements

go-pst currently uses the following to search for messages: It would be better to use the following so we don't have to traverse the whole tree to find the next message:

opened by mooijtech 0
Return empty iterator

We currently return an error when attempting to create an iterator while there are no messages/attachments available. We should return an empty iterator instead.

This is my iterator implementation flaw, but it would have been nice to have a standard iterator in Go: https://github.com/golang/go/discussions/54245 https://github.com/golang/go/discussions/56413

opened by mooijtech 0
io_uring

go-pst currently reads the PST file(s) sequentially. It would be nice to use a Goroutine pool to walk/read structures such as the b-trees/Property Context in parallel.

opened by mooijtech 2

[BUG] OST: invalid table type

Describe the bug After change the file path to an OST file in the example, then go build / run , i got "invalid table type" error.

To Reproduce Steps to reproduce the behavior:

I've used the same code provided in your example but with an OST file.

Expected behavior Should run without error

Stack trace

Initializing...
panic: Failed to open PST file: go-pst: invalid table type
github.com/mooijtech/go-pst/v5/pkg.(*File).GetPropertyContext
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/property_context.go:66
github.com/mooijtech/go-pst/v5/pkg.(*File).GetNameToIDMap
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/name_to_id_map.go:111
github.com/mooijtech/go-pst/v5/pkg.NewFromReaderWithBTrees
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:132
github.com/mooijtech/go-pst/v5/pkg.NewFromReader
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:52
github.com/mooijtech/go-pst/v5/pkg.NewFromFile
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:47
main.main
	/home/eviltik/toto/main.go:18
runtime.main
	/usr/local/go/src/runtime/proc.go:250
runtime.goexit
	/usr/local/go/src/runtime/asm_amd64.s:1594
github.com/mooijtech/go-pst/v5/pkg.(*File).GetNameToIDMap
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/name_to_id_map.go:114
github.com/mooijtech/go-pst/v5/pkg.NewFromReaderWithBTrees
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:132
github.com/mooijtech/go-pst/v5/pkg.NewFromReader
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:52
github.com/mooijtech/go-pst/v5/pkg.NewFromFile
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:47
main.main
	/home/eviltik/toto/main.go:18
runtime.main
	/usr/local/go/src/runtime/proc.go:250
runtime.goexit
	/usr/local/go/src/runtime/asm_amd64.s:1594
github.com/mooijtech/go-pst/v5/pkg.NewFromReaderWithBTrees
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:135
github.com/mooijtech/go-pst/v5/pkg.NewFromReader
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/[email protected]/pkg/file.go:52
github.com/mooijtech/go-pst/v5/pkg.NewFromFile
	/home/eviltik/go/pkg/mod/github.com/mooijtech/go-pst/v5@v5.0.0/pkg/file.go:47
main.main
	/home/eviltik/toto/main.go:18
runtime.main
	/usr/local/go/src/runtime/proc.go:250
runtime.goexit
	/usr/local/go/src/runtime/asm_amd64.s:1594


goroutine 1 [running]:
main.main()
	/home/eviltik/toto/main.go:21 +0x239

Platform (please complete the following information):

go-pst v5
go version go1.19.2 linux/amd64

bug

opened by eviltik 1

Releases(v5.0.4)

v5.0.4(Oct 30, 2022)

Switch to tinylib/msgp for populating properties.
Source code(tar.gz)
Source code(zip)
v5.0.3(Oct 29, 2022)

Fix iterator off-by-one
Source code(tar.gz)
Source code(zip)
v5.0.2(Oct 25, 2022)

Fix passing local descriptors
Source code(tar.gz)
Source code(zip)
v5.0.1(Oct 25, 2022)
Fix Name-to-ID-Map string stream not being given the local descriptors, references #26

Source code(tar.gz)
Source code(zip)
v5.0.0(Oct 23, 2022)
go-pst v5:

Integrate with stdlib I/O interfaces

B-Tree abstraction

Switch to tidwall/btree

Improve type safety

Reduce boilerplate code to get started

Add example for pkg.go.dev

Explicit use of integer types

Create a property reader to handle converting property data types from bytes

Generate all properties automatically with Protocol Buffers

Add iterators

Separate HeapOnNodeReader logic

Source code(tar.gz)
Source code(zip)