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18974d5b8d
- changed to github - many changes since first release - added FEFE patch, see https://ptrace.fefe.de/bdelta.diff - added LICENSE PR: 209063 Approved by: novel (maintainer)
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
--- file.h.orig 2013-01-30 20:16:01 UTC
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+++ file.h
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@@ -3,6 +3,7 @@
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <stdio.h>
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+#include <cstdlib>
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#define MAX_IO_BLOCK_SIZE (1024 * 1024)
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@@ -58,6 +59,44 @@ unsigned read_dword(FILE *f) {
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return (read_word(f) << 16) + low;
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}
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+static size_t scan_varint(const char* in,size_t len, unsigned long long* n) {
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+ size_t i;
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+ unsigned long long l;
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+ if (len==0) return 0;
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+ for (l=0, i=0; i<len; ++i) {
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+ l+=(unsigned long long)(in[i]&0x7f) << (i*7);
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+ if (!(in[i]&0x80)) {
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+ *n=l;
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+ return i+1;
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+ }
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+ }
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+ return 0;
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+}
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+
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+size_t scan_pb_type0_sint(const char* in,size_t len,signed long long* l) {
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+ unsigned long long m;
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+ size_t n=scan_varint(in,len,&m);
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+ if (!n) return 0;
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+ *l=(-(m&1)) ^ (m>>1);
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+ return n;
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+}
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+
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+long long read_varint(FILE* f) {
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+ char buf[20];
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+ size_t i;
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+ long long l;
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+ for (i=0; i<sizeof(buf); ++i) {
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+ fread_fixed(f,buf+i,1);
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+ if (!(buf[i]&0x80)) {
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+ if (scan_pb_type0_sint(buf,i+1,&l)!=i+1) break;
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+ return l;
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+ }
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+ }
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+ static char read_error_message[128];
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+ strcpy(read_error_message, "parse error: read_varint() failed");
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+ throw read_error_message;
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+}
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+
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void write_word(FILE *f, unsigned number) {
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unsigned char b = number & 255,
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b2 = number >> 8;
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@@ -70,6 +109,31 @@ void write_dword(FILE *f, unsigned numbe
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write_word(f, number >> 16);
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}
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+
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+/* write int in least amount of bytes, return number of bytes */
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+/* as used in varints from Google protocol buffers */
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+static size_t fmt_varint(char* dest,unsigned long long l) {
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+ /* high bit says if more bytes are coming, lower 7 bits are payload; little endian */
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+ size_t i;
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+ for (i=0; l; ++i, l>>=7) {
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+ if (dest) dest[i]=(l&0x7f) | ((!!(l&~0x7f))<<7);
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+ }
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+ if (!i) { /* l was 0 */
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+ if (dest) dest[0]=0;
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+ ++i;
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+ }
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+ return i;
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+}
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+
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+static size_t fmt_pb_type0_sint(char* dest,signed long long l) {
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+ return fmt_varint(dest,(l << 1) ^ (l >> (sizeof(l)*8-1)));
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+}
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+
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+void write_varint(FILE* f, long long number) {
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+ char tmp[20];
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+ fwrite_fixed(f,tmp,fmt_pb_type0_sint(tmp,number));
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+}
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+
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bool fileExists(char *fname) {
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FILE *f = fopen(fname, "rb");
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bool exists = (f != NULL);
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