optimizations, fixes, hacks, psp, ...

git-svn-id: file:///home/notaz/opt/svn/PicoDrive@295 be3aeb3a-fb24-0410-a615-afba39da0efa

tools/gcda.c

@@ -0,0 +1,110 @@
+#include <stdio.h>
+//#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+
+static int search_gcda(const char *str, int len)
+{
+	int i;
+	for (i = 0; i < len - 6; i++)
+		if (str[i]   == '.' && str[i+1] == 'g' && str[i+2] == 'c' &&
+		    str[i+3] == 'd' && str[i+4] == 'a' && str[i+5] == 0)
+			return i;
+	return -1;
+}
+
+static int is_good_char(char c)
+{
+	return c >= ' ' && c < 0x7f;
+}
+
+static int is_good_path(char *path)
+{
+	int len = strlen(path);
+
+	path[len-2] = 'n';
+	path[len-1] = 'o';
+
+	FILE *f = fopen(path, "rb");
+
+	path[len-2] = 'd';
+	path[len-1] = 'a';
+
+	if (f) {
+		fclose(f);
+		return 1;
+	}
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	char buff[1024], *p;
+	char cwd[4096];
+	FILE *f;
+	int l, pos, pos1, old_len, cwd_len;
+
+	if (argc != 2) return 1;
+
+	getcwd(cwd, sizeof(cwd));
+	cwd_len = strlen(cwd);
+	if (cwd[cwd_len-1] != '/') {
+		cwd[cwd_len++] = '/';
+		cwd[cwd_len] = 0;
+	}
+
+	f = fopen(argv[1], "rb+");
+	if (f == NULL) return 2;
+
+	while (1)
+	{
+readnext:
+		l = fread(buff, 1, sizeof(buff), f);
+		if (l <= 16) break;
+
+		pos = 0;
+		while (pos < l)
+		{
+			pos1 = search_gcda(buff + pos, l - pos);
+			if (pos1 < 0) {
+				fseek(f, -5, SEEK_CUR);
+				goto readnext;
+			}
+			pos += pos1;
+
+			while (pos > 0 && is_good_char(buff[pos-1])) pos--;
+
+			if (pos == 0) {
+				fseek(f, -16, SEEK_CUR);
+				goto readnext;
+			}
+
+			// paths must start with /
+			while (pos < l && buff[pos] != '/') pos++;
+			p = buff + pos;
+			old_len = strlen(p);
+
+			if (!is_good_path(p)) {
+				pos += old_len;
+				continue;
+			}
+
+			if (strncmp(p, cwd, cwd_len) != 0) {
+				printf("can't handle: %s\n", p);
+				pos += old_len;
+				continue;
+			}
+
+			memmove(p, p + cwd_len, old_len - cwd_len + 1);
+			fseek(f, -(sizeof(buff) - pos), SEEK_CUR);
+			fwrite(p, 1, old_len, f);
+			goto readnext;
+		}
+	}
+
+	fclose(f);
+
+	return 0;
+}
+