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Extended MD5 API a bit: added a variant of md5_file which takes an arbitrary ReadStream; and added md5_file_string methods which directly produce a human readable md5 string (instead of a binary digest)

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svn-id: r25592
This commit is contained in:
Max Horn 2007-02-14 21:43:21 +00:00
parent 8bd1bd53b9
commit 80f799a2b2
2 changed files with 65 additions and 12 deletions
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57
common/md5.cpp
View File

@ -34,6 +34,17 @@
namespace Common {
typedef struct {
uint32 total[2];
uint32 state[4];
uint8 buffer[64];
} md5_context;
void md5_starts(md5_context *ctx);
void md5_update(md5_context *ctx, const uint8 *input, uint32 length);
void md5_finish(md5_context *ctx, uint8 digest[16]);
#define GET_UINT32(n, b, i) (n) = READ_LE_UINT32(b + i)
#define PUT_UINT32(n, b, i) WRITE_LE_UINT32(b + i, n)
@ -253,6 +264,12 @@ bool md5_file(const char *name, uint8 digest[16], uint32 length) {
warning("md5_file couldn't open '%s'", name);
return false;
}
return md5_file(f, digest, length);
}
bool md5_file(ReadStream &stream, uint8 digest[16], uint32 length) {
#ifdef DISABLE_MD5
memset(digest, 0, 16);
@ -261,7 +278,7 @@ bool md5_file(const char *name, uint8 digest[16], uint32 length) {
int i;
unsigned char buf[1000];
bool restricted = (length != 0);
int readlen;
uint32 readlen;
if (!restricted || sizeof(buf) <= length)
readlen = sizeof(buf);
@ -270,7 +287,7 @@ bool md5_file(const char *name, uint8 digest[16], uint32 length) {
md5_starts(&ctx);
while ((i = f.read(buf, readlen)) > 0) {
while ((i = stream.read(buf, readlen)) > 0) {
md5_update(&ctx, buf, i);
length -= i;
@ -286,6 +303,42 @@ bool md5_file(const char *name, uint8 digest[16], uint32 length) {
return true;
}
bool md5_file_string(const FilesystemNode &file, char md5str[32+1], uint32 length) {
uint8 digest[16];
if (!md5_file(file, digest, length))
return false;
for (int i = 0; i < 16; i++) {
sprintf(md5str + i*2, "%02x", (int)digest[i]);
}
return true;
}
bool md5_file_string(const char *name, char md5str[32+1], uint32 length) {
uint8 digest[16];
if (!md5_file(name, digest, length))
return false;
for (int i = 0; i < 16; i++) {
sprintf(md5str + i*2, "%02x", (int)digest[i]);
}
return true;
}
bool md5_file_string(ReadStream &stream, char md5str[32+1], uint32 length) {
uint8 digest[16];
if (!md5_file(stream, digest, length))
return false;
for (int i = 0; i < 16; i++) {
sprintf(md5str + i*2, "%02x", (int)digest[i]);
}
return true;
}
} // End of namespace Common
#ifdef TEST

20
common/md5.h
View File

@ -24,21 +24,21 @@
#include "common/scummsys.h"
#include "common/fs.h"
#include "common/stream.h"
namespace Common {
typedef struct {
uint32 total[2];
uint32 state[4];
uint8 buffer[64];
} md5_context;
void md5_starts(md5_context *ctx);
void md5_update(md5_context *ctx, const uint8 *input, uint32 length);
void md5_finish(md5_context *ctx, uint8 digest[16]);
bool md5_file(const char *name, uint8 digest[16], uint32 length = 0);
bool md5_file(const FilesystemNode &file, uint8 digest[16], uint32 length = 0);
bool md5_file(ReadStream &stream, uint8 digest[16], uint32 length = 0);
// The following two methods work similar to the above two, but
// instead of computing the binary MD5 digest, they produce
// a human readable lowercase hexstring representing the digest.
bool md5_file_string(const char *name, char md5str[32+1], uint32 length = 0);
bool md5_file_string(const FilesystemNode &file, char md5str[32+1], uint32 length = 0);
bool md5_file_string(ReadStream &stream, char md5str[32+1], uint32 length = 0);
} // End of namespace Common