Add a helper method for reading/writing memory#123
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tenderlove merged 3 commits intomasterfrom Mar 16, 2023
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Hmm. Fiddle::Pointer[value] and Fiddle::Pointer[address, length] may be confused.
How about Fiddle::Pointer.read/Fiddle::Pointer.write (like IO.read/IO.write) instead?
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That sounds good to me. I wish we could use |
This commit adds two new methods, `Fiddle::Pointer.read` and `Fiddle::Pointer.write`. Both methods take an address, and will read or write bytes at that address respectively. For example we can read from an address without making a Pointer object: ```ruby Fiddle::Pointer.read(address, 5) # read 5 bytes ``` We can also write to an address without allocating a Pointer object: ```ruby Fiddle::Pointer.write(address, "bytes") # write 5 bytes ``` This allows us to read / write memory at arbitrary addresses without instantiating a new `Fiddle::Pointer` object. Co-Authored-By: Sutou Kouhei <kou@clear-code.com>
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kou
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Co-authored-by: Sutou Kouhei <kou@clear-code.com>
Co-authored-by: Sutou Kouhei <kou@clear-code.com>
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(ruby/fiddle#123) This commit adds two new methods, `Fiddle::Pointer.read` and `Fiddle::Pointer.write`. Both methods take an address, and will read or write bytes at that address respectively. For example we can read from an address without making a Pointer object: ```ruby Fiddle::Pointer.read(address, 5) # read 5 bytes ``` We can also write to an address without allocating a Pointer object: ```ruby Fiddle::Pointer.write(address, "bytes") # write 5 bytes ``` This allows us to read / write memory at arbitrary addresses without instantiating a new `Fiddle::Pointer` object. Examples where this API would be useful [1](https://github.com/tenderlove/tenderjit/blob/f03481d28bff4d248746e596929b0841de65f181/lib/tenderjit/fiddle_hacks.rb#L26-L28) [2](https://github.com/tenderlove/ruby/blob/77c8daa2d40dd58eeb3785ce17dea2ee38f308d1/lib/ruby_vm/rjit/c_pointer.rb#L193) [3](https://github.com/tenderlove/ruby/blob/77c8daa2d40dd58eeb3785ce17dea2ee38f308d1/lib/ruby_vm/rjit/c_pointer.rb#L284) I also added a writer method for the same reasons as the reader. --------- ruby/fiddle@04238cefed Co-authored-by: Sutou Kouhei <kou@clear-code.com>
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This commit adds two new methods,
Fiddle::Pointer.readandFiddle::Pointer.write. Both methods take an address, and will read or write bytes at that address respectively.For example we can read from an address without making a Pointer object:
We can also write to an address without allocating a Pointer object:
This allows us to read / write memory at arbitrary addresses without instantiating a new
Fiddle::Pointerobject.Examples where this API would be useful 1 2 3
I also added a writer method for the same reasons as the reader.