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local ec = require("elf.constants")
local fmt = require("elf.fmt")
---@class Segment
---@field type SegmentType
---@field flags integer
---@field offset integer
---@field vaddr integer
---@field paddr integer
---@field filesz integer
---@field memsz integer
---@field align integer
---@class Segments
local M = {}
---@param phdr Segment
---@param endian Endian
---@return string
---@nodiscard
local function pack32(phdr, endian)
return string.pack(
fmt.endian(endian) .. string.rep(fmt.word(ec.Class.bit32), 8),
phdr.type,
phdr.offset,
phdr.vaddr,
phdr.paddr,
phdr.filesz,
phdr.memsz,
phdr.flags,
phdr.align)
end
---@param phdr Segment
---@param endian Endian
---@return string
---@nodiscard
local function pack64(phdr, endian)
return string.pack(
fmt.endian(endian) .. "I4I4" .. string.rep(fmt.word(ec.Class.bit64), 6),
phdr.type,
phdr.flags,
phdr.offset,
phdr.vaddr,
phdr.paddr,
phdr.filesz,
phdr.memsz,
phdr.align)
end
---@param phdrs Segment[]
---@param endian Endian
---@param class Class
---@return string
---@nodiscard
function M.pack(phdrs, endian, class)
local p = {}
for i, phdr in ipairs(phdrs) do
p[i] = (class == ec.Class.bit32) and
pack32(phdr, endian) or
pack64(phdr, endian)
end
return table.concat(p)
end
return M
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