b9319

ggml: gguf_init_from_callback and gguf_init_from_buffer (#22341)

• ggml: implement gguf_init_from_buffer

• test: gguf_init_from_buffer

• fix: memory breakdown for a model loaded with no_alloc from a file is consistent with being loaded from a buffer

• fix: use GGML_UNUSED

Co-authored-by: Copilot copilot@github.com

• fix: remove total_size from gguf_reader

• fix: file offset calculation, rename offset to data_offset

Co-authored-by: Copilot copilot@github.com

• refactor: extract model loader bug fixes to another PR

• feat: add gguf_init_from_callback

• fix: always require a max expected size

• fix: change gguf_reader_callback_t's output type to void *, change max_expected_size and offsets to uint64_t

• fix: harden against offset overflow in buffer read

• fix: remove seek behavior from the callback

• feat: max_chunk_read == 0 means SIZE_MAX

• fix: seeking in a gguf file with no tensors

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Co-authored-by: Copilot copilot@github.com

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