129 lines
4.8 KiB
C
129 lines
4.8 KiB
C
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/* f32dbg_test.c — f32 字库路径查找宿主复现测试（诊断 M1 zhfont -3）
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*
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* 用 deshab-dev.img 文件作 block 后端（GPT ESP @ LBA2048），
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* 直接调用 fat32_io.h 的查找逻辑，定位 simhei_16.dbf 为何找不到。
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* 用法：clang f32dbg_test.c -o f32dbg && ./f32dbg <img>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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typedef unsigned char u8;
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typedef unsigned short u16;
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typedef unsigned int u32;
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typedef unsigned long long u64;
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typedef long long i64;
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#include "../tools/fat32_io.h"
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static FILE *g_img;
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static u64 g_esp_off;
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static int img_block_read(u32 index, u64 lba, u32 count, void *buf) {
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(void)index;
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if (_fseeki64(g_img, (long long)(g_esp_off + lba * 512), SEEK_SET) != 0) return -1;
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if (fread(buf, 512, count, g_img) != count) return -1;
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return 0;
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}
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static int img_block_write(u32 index, u64 lba, u32 count, const void *buf) {
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(void)index; (void)lba; (void)count; (void)buf; return -1;
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}
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int main(int argc, char **argv) {
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const char *path = (argc > 1) ? argv[1] : "../../ISO/deshab-dev.img";
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g_img = fopen(path, "rb");
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if (!g_img) { printf("open %s failed\n", path); return 1; }
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/* GPT ESP at LBA 2048 */
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u8 hdr[512];
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fseek(g_img, 512, SEEK_SET);
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fread(hdr, 1, 512, g_img);
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if (memcmp(hdr, "EFI PART", 8) != 0) { printf("no GPT\n"); return 1; }
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g_esp_off = 2048ULL * 512;
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f32_init(img_block_read, img_block_write);
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int rc = f32_disk_load();
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printf("f32_disk_load rc=%d\n", rc);
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if (rc != 0) return 1;
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const f32_bpb *bpb = (const f32_bpb *)f32_disk;
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printf("spc=%u rsvd=%u fc=%u spf=%u root_clus=%u\n",
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bpb->spc, bpb->rsvd, bpb->fc, bpb->spf, bpb->root_clus);
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/* 1. 目录定位 */
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u32 dclus = 0;
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rc = f32_find_path_dir_lfn("system/font", &dclus);
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printf("find_path_dir(system/font) rc=%d clus=%u\n", rc, dclus);
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if (rc != 0) return 1;
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/* 2. 在 FONT 目录中找文件（对照：LFN 与短名） */
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u32 fclus = 0, fsize = 0;
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rc = f32_find_in_dir_lfn(dclus, "simhei_16.dbf", 0, &fclus, &fsize);
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printf("find(simhei_16.dbf) rc=%d clus=%u size=%u\n", rc, fclus, fsize);
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rc = f32_find_in_dir_lfn(dclus, "SIMHEI~1.DB F", 0, &fclus, &fsize);
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printf("find(SIMHEI~1.DBF) rc=%d\n", rc);
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/* M2: 壁纸读取复现（rc=-4 路径） */
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{
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static u8 wpbuf[8u*1024u*1024u];
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u32 wpsize = 0;
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rc = f32_read_path_lfn_to("system/wallpaper.rgba", wpbuf, 2800512u, &wpsize);
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printf("read(wallpaper.rgba) rc=%d size=%u\n", rc, wpsize);
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if (rc != 0) {
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u32 c2 = 0;
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rc = f32_read_path_lfn_to("system/wallpaper.rgba", wpbuf, 4096, &c2);
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printf(" small-cap probe rc=%d size=%u\n", rc, c2);
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}
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}
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/* 3. 手工枚举 FONT 目录条目，dump LFN/短名/checksum */
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{
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u32 spc = bpb->spc;
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u32 data_lba = bpb->rsvd + (u32)bpb->fc * bpb->spf;
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u64 fat_byte_off = bpb->rsvd * 512;
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u32 clus = dclus;
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printf("--- FONT dir entries ---\n");
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while (clus >= 2 && clus < 0x0FFFFFF8) {
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u32 lba = data_lba + (clus - 2) * spc;
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const u8 *cb;
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if ((u64)lba * 512 + (u64)spc * 512 <= 256ULL * 512)
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cb = f32_disk + (u64)lba * 512;
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else {
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if (f32_read_sectors(lba, spc, f32_cluster) != 0) {
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printf("dir cluster read failed lba=%u\n", lba);
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return 1;
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}
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cb = f32_cluster;
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}
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u32 entry_count = (spc * 512) / 32;
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for (u32 e = 0; e < entry_count; e++) {
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const u8 *entry = cb + e * 32;
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if (entry[0] == 0) { printf("[end]\n"); goto done; }
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if ((u8)entry[0] == 0xE5) continue;
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if (entry[11] == 0x0F) {
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/* LFN 片段：seq=c0 seq|0x40 首段 */
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printf("LFN seq=0x%02x name1='%.5s' name2='%.6s' name3='%.2s' cksum=0x%02x\n",
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entry[0],
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(const char*)(const void*)((u16*)entry + 1),
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(const char*)(const void*)((u16*)entry + 6),
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(const char*)(const void*)((u16*)entry + 14),
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entry[13]);
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continue;
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}
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char nm[12];
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memcpy(nm, entry, 11);
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nm[11] = 0;
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printf("SHORT '%s' attr=0x%02x clus=%u size=%u\n", nm, entry[11],
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(unsigned)(entry[26] | (entry[20] << 16)),
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(unsigned)(entry[28] | (entry[29]<<8) | (entry[30]<<16) | ((u32)entry[31]<<24)));
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}
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u32 fo = fat_byte_off + clus * 4;
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if (fo + 4 > sizeof(f32_disk)) break;
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clus = f32_r32(f32_disk + fo) & 0x0FFFFFFF;
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}
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}
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done:
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return 0;
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}
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