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TP-Link safeloader firmware images contain a number of (small) partitions with information about the device. These consist of: * The data length as a 32-bit integer * A 32-bit zero padding * The partition data, with its length set in the first field The OpenWrt factory image partitions that follow this structure are soft-version, support-list, and extra-para. Refactor the code to put all common logic into one allocation call, and let the rest of the data be filled in by the original functions. Due to the extra-para changes, this patch results in factory images that change by 2 bytes (not counting the checksum) for three devices: * ARCHER-A7-V5 * ARCHER-C7-V4 * ARCHER-C7-V5 These were the devices where the extra-para blob didn't match the common format. The hardcoded data also didn't correspond to TP-Link's (recent) upgrade images, which actually matches the meta-partition format. A padding byte is also added to the extra-para partition for EAP245-V3. Signed-off-by: Sander Vanheule <sander@svanheule.net>