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1859776
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2009-12-07T12:50:00.790
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2009-12-07T12:50:00.790
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226342
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1857789
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Doing memcpy from an entire struct is truly evil :-). First of all the data might be aligned differently depending on architecture. What if the architecture is different on the other side? Also using keywords such as __packed isn't portable between different compilers. The best, as I know, is to use an API like the PHP pack/unpack. This makes the code truly portable without using compiler specific ugly keywords such as __packed. I didn't find any pack/unpack for C on the net so I wrote my own. For example to unpack two words from binary data: <pre><code> pbuf_unpack(p_bts, "ww", &hdr, &ver); </code></pre> Where <pre><code> p_bts is binary data "ww" describes the data structure hdr and ver is where to put the datause an API like the PHP pack/unpack. </code></pre> Another more extensive example: <pre><code> pbuf_unpack(p_entry, "bbbbbbbbww", &atrb_mbr.def_boot_par, &atrb_mbr.head_start, &atrb_mbr.sec_start, &atrb_mbr.cyl_start, &atrb_mbr.type, &atrb_mbr.head_end, &atrb_mbr.sec_end, &atrb_mbr.cyl_end, &atrb_mbr.start_sec_pbr, &atrb_mbr.sec_per_par); </code></pre> Packing is very easy: <pre><code> pbuf_pack(boot_buf, "sdsdhbhbhhbhhhwwbbbwsdsd", sizeof(fat_jmp_boot_t), boot.jmp, sizeof(fat_oem_nm_t), boot.oem_nm, boot.n_bps, boot.n_spc, boot.n_rs, boot.n_fs, boot.n_rde, boot.n_ts16, boot.media_des, boot.n_fatsz16, boot.n_spt, boot.n_hds, boot.n_hs, boot.n_ts32, boot.drv_no, boot.rsrvd1, boot.boot_sig, boot.vol_id, sizeof(fat_vol_lbl_t), boot.lbl, sizeof(fat_vol_type_t), boot.type); </code></pre> Not only does it create portable code but it's also beautiful;)
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1. POHow to copy a char[] in c into my struct
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1. USHenrik
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