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Editorial Team
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Asked: 2026-05-14T15:43:56+00:00

I need to read fixed number of bytes from files, whose sizes are around

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I need to read fixed number of bytes from files, whose sizes are around 50MB. To be more precise, read a frame from YUV 4:2:0 CIF/QCIF files (~25KB to ~100KB per frame). Not very huge number but I don’t want whole file to be in the memory. I’m using C++, in such a case, which of FILE* or ifstream has better (less/minimal) memory usage? Please kindly advise. Thanks!

EDIT:

I read fixed number of bytes: 25KB or 100KB (depending on QCIF/CIF format). The reading is in binary mode and forward-only. No seeking needed. No writing needed, only reading.

EDIT:

If identifying better of them is hard, which one does not require loading the whole file into memory?

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1 Answer

  1. Editorial Team

    Impossible to say – it will depend on the implementation, and how you are reading the data, which you have not described. In general, questions here regarding performance are somewhat pointless, as they depend heavily on your actual usage of library and language features, the specific implementation, your hardware etc. etc.

    Edit: To answer your expanded question – neither library requires you read everything into memory. Why would you think they do?

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