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Speedup hexviewer search operations

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This commit is contained in:
d0k3 2016-12-11 15:40:44 +01:00
parent 9466fe37d1
commit a74897c0fb
2 changed files with 26 additions and 9 deletions
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33
source/fs/fsutil.c
View File

@ -194,21 +194,37 @@ bool FileGetSha256(const char* path, u8* sha256) {
return ret;
}
u32 FileFindData(const char* path, u8* data, u32 size, u32 offset) {
u32 FileFindData(const char* path, u8* data, u32 size_data, u32 offset_file) {
int drvtype = DriveType(path);
u32 found = (u32) -1;
u32 fsize = FileGetSize(path);
// open FAT / virtual file
FIL file; // only used on FAT drives
VirtualFile vfile; // only used on virtual drives
if (((drvtype & DRV_FAT) && (fx_open(&file, path, FA_READ | FA_OPEN_EXISTING) != FR_OK)) ||
((drvtype & DRV_VIRTUAL) && !GetVirtualFile(&vfile, path))) return found;
// main routine
for (u32 pass = 0; pass < 2; pass++) {
bool show_progress = false;
u32 pos = (pass == 0) ? offset : 0;
u32 search_end = (pass == 0) ? fsize : offset + size;
u32 pos = (pass == 0) ? offset_file : 0;
u32 search_end = (pass == 0) ? fsize : offset_file + size_data;
search_end = (search_end > fsize) ? fsize : search_end;
for (; (pos < search_end) && (found == (u32) -1); pos += MAIN_BUFFER_SIZE - (size - 1)) {
for (; (pos < search_end) && (found == (u32) -1); pos += MAIN_BUFFER_SIZE - (size_data - 1)) {
UINT read_bytes = min(MAIN_BUFFER_SIZE, search_end - pos);
if (FileGetData(path, MAIN_BUFFER, read_bytes, pos) != read_bytes)
break;
for (u32 i = 0; i + size <= read_bytes; i++) {
if (memcmp(MAIN_BUFFER + i, data, size) == 0) {
if (drvtype & DRV_FAT) {
UINT btr;
f_lseek(&file, pos);
if ((fx_read(&file, MAIN_BUFFER, read_bytes, &btr) != FR_OK) || (btr != read_bytes))
break;
} else {
u32 btr;
if ((ReadVirtualFile(&vfile, MAIN_BUFFER, pos, read_bytes, &btr) != 0) || (btr != read_bytes))
break;
}
for (u32 i = 0; i + size_data <= read_bytes; i++) {
if (memcmp(MAIN_BUFFER + i, data, size_data) == 0) {
found = pos + i;
break;
}
@ -221,6 +237,7 @@ u32 FileFindData(const char* path, u8* data, u32 size, u32 offset) {
break;
}
}
if (drvtype & DRV_FAT) fx_close(&file);
return found;
}

2
source/fs/fsutil.h
View File

@ -33,7 +33,7 @@ size_t FileGetSize(const char* path);
bool FileGetSha256(const char* path, u8* sha256);
/** Find data in file **/
u32 FileFindData(const char* path, u8* data, u32 size, u32 offset);
u32 FileFindData(const char* path, u8* data, u32 size_data, u32 offset_file);
/** Inject file into file @offset **/
bool FileInjectFile(const char* dest, const char* orig, u32 offset);