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Difference between revisions of "IMG4 File Format"
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| − | There is an '''img4''' file (sep-firmware.img4) found in /user/standalone/firmware on [[iOS]] 7.0.4 for the [[iPhone 5s]]. The IPSWFILE/Firmware/all_flash/all_flash.DEVICEIDENTIFIER.production for any [[A7]] (64 bit) device containts an IM4P version of the same file. |
+ | There is an '''img4''' file (sep-firmware.img4) found in /user/standalone/firmware on [[iOS]] 7.0.4 for the [[iPhone 5s]]. The IPSWFILE/Firmware/all_flash/all_flash.DEVICEIDENTIFIER.production for any [[A7]] (64 bit) device containts an IM4P version of the same file. The file is an [http://en.wikipedia.org/wiki/Abstract_Syntax_Notation_One#Example_encoded_in_DER DER encoded ASN.1 object] and structured as follows: |
==Header== |
==Header== |
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<pre> |
<pre> |
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| + | 30 - type tag indicating SEQUENCE |
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| − | uint8_t ??; //0x30 |
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| + | 8 - ? |
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| − | uint8_t lengthOfSize; //0x83 = 3byte, 0x84 = 4byte |
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| + | 3 - 2,3,4 length in octets of value that follows (length of next value; size of file) |
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| − | 3,4 byte sizeFromHere; //Size of Image |
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| + | x octets - size of file from here |
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| − | uint32_t delimiter; //0x1604 |
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| + | 16 - indicating an [http://en.wikipedia.org/wiki/IA5String IA5String] to follow |
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| − | uint32_t magic; //IMG4 |
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| + | 04 - length in octets of IA5String that follows |
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| + | 49 4D 47 34 - IA5String, the magic "IMG4" |
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| + | ... - sequential data |
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</pre> |
</pre> |
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Revision as of 04:14, 27 December 2013
There is an img4 file (sep-firmware.img4) found in /user/standalone/firmware on iOS 7.0.4 for the iPhone 5s. The IPSWFILE/Firmware/all_flash/all_flash.DEVICEIDENTIFIER.production for any A7 (64 bit) device containts an IM4P version of the same file. The file is an DER encoded ASN.1 object and structured as follows:
Header
30 - type tag indicating SEQUENCE 8 - ? 3 - 2,3,4 length in octets of value that follows (length of next value; size of file) x octets - size of file from here 16 - indicating an [http://en.wikipedia.org/wiki/IA5String IA5String] to follow 04 - length in octets of IA5String that follows 49 4D 47 34 - IA5String, the magic "IMG4" ... - sequential data
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