mirror of
https://github.com/jamesstringer90/appsandbox.git
synced 2026-10-22 02:52:49 -05:00
James Stringer
0d4897dd6b
Run Windows 11 ARM64 guests on macOS over QEMU+HVF, with an ivshmem shared-memory transport carrying every guest channel (agent control, display/VDD, input, audio, clipboard, SSH, 9P) - no guest networking required. - tools/transport: one guest transport API, two backends (PC AF_HYPERV, Mac ivshmem); SPSC ring with an acquire-barrier fix for SSH integrity - tools/ivshmem: our own KMDF ivshmem BAR-mapping driver (no third party) - src/backend_mac: Mac-host ivshmem transport, QEMU VM lifecycle, IDD display consumer, agent/SSH proxies, ISO->disk patcher, Windows create - tools/agent + channel EXEs + tools/vdd: wired to asb_transport - tools/agent_win: staged guest payload (interim, pending JIT pull) - vendor/qemu-ivshmem: vendored QEMU 11.0.1 fork (ivshmem-plain) + LGPL source mirror for the self-contained app bundle - tools/sign/make-release.ps1: use the host-native ARM64 MSBuild so the WDK driver ApiValidator runs (the x86 validator fails on ARM64)
75 lines
3.2 KiB
C
75 lines
3.2 KiB
C
/*
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* resource.c -- read a full WIM resource into memory, decompressing per-chunk.
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* Handles uncompressed and non-solid (XPRESS/LZX) resources; solid (LZMS) is
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* dispatched once lzms.c lands. Chunk-table arithmetic per the verified spec
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* (docs/appsandbox/codecs/WIM.md): cumulative offsets, num_chunks-1 entries,
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* 4-byte if resource < 4 GiB else 8-byte, stored-chunk (csize==usize) memcpy.
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*/
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#include "wim.h"
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#include "lzx.h"
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#include "xpress.h"
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#include "lzms.h"
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#include <stdlib.h>
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#include <string.h>
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static uint64_t entry_at(const uint8_t *tbl, unsigned esz, uint64_t idx) {
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const uint8_t *p = tbl + idx * esz;
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if (esz == 4) return (uint32_t)(p[0] | (p[1]<<8) | (p[2]<<16) | ((uint32_t)p[3]<<24));
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uint64_t v = 0; for (int i = 0; i < 8; i++) v |= (uint64_t)p[i] << (8*i); return v;
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}
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int wim_read_resource(const wim_t *w, const wim_resource_t *r, uint8_t *out) {
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if (r->flags & WIM_RESHDR_SOLID) return -2; /* solid/LZMS via lzms path (TODO wiring) */
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if (!(r->flags & WIM_RESHDR_COMPRESSED)) /* stored uncompressed */
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return wim_pread(w, out, (size_t)r->orig_size, r->offset);
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wim_comp_t comp = wim_compression(w);
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uint32_t chunk_size = wim_chunk_size(w);
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uint64_t orig = r->orig_size;
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if (orig == 0) return 0;
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uint64_t num_chunks = (orig + chunk_size - 1) / chunk_size;
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unsigned esz = (orig <= 0xFFFFFFFFull) ? 4 : 8;
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uint64_t num_entries = num_chunks - 1;
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uint64_t table_size = num_entries * esz;
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uint8_t *table = NULL;
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if (table_size) {
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table = malloc((size_t)table_size);
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if (!table) return -1;
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if (wim_pread(w, table, (size_t)table_size, r->offset) != 0) { free(table); return -1; }
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}
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uint64_t data_start = r->offset + table_size;
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uint64_t data_size = r->size_in_wim - table_size;
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uint8_t *cbuf = malloc(chunk_size); /* csize <= usize <= chunk_size */
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if (!cbuf) { free(table); return -1; }
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int rc = 0;
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for (uint64_t i = 0; i < num_chunks; i++) {
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uint64_t cstart = (i == 0) ? 0 : entry_at(table, esz, i - 1);
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uint64_t cend = (i == num_chunks - 1) ? data_size : entry_at(table, esz, i);
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if (cend < cstart || cend > data_size) { rc = -1; break; }
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size_t csize = (size_t)(cend - cstart);
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size_t usize = (i == num_chunks - 1) ? (size_t)(orig - (num_chunks - 1) * (uint64_t)chunk_size)
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: chunk_size;
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if (csize == 0 || csize > chunk_size) { rc = -1; break; }
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if (wim_pread(w, cbuf, csize, data_start + cstart) != 0) { rc = -1; break; }
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uint8_t *dst = out + i * (uint64_t)chunk_size;
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if (csize == usize) { /* stored chunk */
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memcpy(dst, cbuf, usize);
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} else {
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int d;
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switch (comp) {
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case WIM_COMP_LZX: d = lzx_decompress(cbuf, csize, dst, usize); break;
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case WIM_COMP_XPRESS: d = xpress_decompress(cbuf, csize, dst, usize); break;
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case WIM_COMP_LZMS: d = lzms_decompress(cbuf, csize, dst, usize); break;
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default: d = -1; break;
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}
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if (d != 0) { rc = -1; break; }
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}
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}
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free(table);
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free(cbuf);
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return rc;
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}
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