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authorDan McGee <dan@archlinux.org>2011-10-27 16:24:30 -0500
committerDan McGee <dan@archlinux.org>2011-11-01 10:27:31 -0500
commited3cd7573600bf8be2bda01ad75da8bae2f589fb (patch)
treeb98ea8c7f58a526a52983dc796fbae916d774bfe
parentba7a056d586f78954ac874a3bebc6325f7e6eeb1 (diff)
downloadpacman-ed3cd7573600bf8be2bda01ad75da8bae2f589fb.tar.xz
libalpm/util: use low-level I/O for copyfile and checksum routines
This removes an unnecessary level of buffering. We are not doing line-based I/O here, so we can read in blocks of 8K at a time directly from the file. Signed-off-by: Dan McGee <dan@archlinux.org>
-rw-r--r--lib/libalpm/util.c116
1 files changed, 61 insertions, 55 deletions
diff --git a/lib/libalpm/util.c b/lib/libalpm/util.c
index 5e32280f..5056b98a 100644
--- a/lib/libalpm/util.c
+++ b/lib/libalpm/util.c
@@ -125,46 +125,50 @@ int _alpm_makepath_mode(const char *path, mode_t mode)
int _alpm_copyfile(const char *src, const char *dest)
{
- FILE *in, *out;
- size_t len;
char *buf;
- int ret = 0;
+ int in, out, ret = 1;
+ ssize_t nread;
+ struct stat st;
- in = fopen(src, "rb");
- if(in == NULL) {
- return 1;
- }
- out = fopen(dest, "wb");
- if(out == NULL) {
- fclose(in);
- return 1;
+ MALLOC(buf, (size_t)ALPM_BUFFER_SIZE, return 1);
+
+ OPEN(in, src, O_RDONLY);
+ do {
+ out = open(dest, O_WRONLY | O_CREAT, 0000);
+ } while(out == -1 && errno == EINTR);
+ if(in < 0 || out < 0) {
+ goto cleanup;
}
- MALLOC(buf, (size_t)ALPM_BUFFER_SIZE, ret = 1; goto cleanup);
+ if(fstat(in, &st) || fchmod(out, st.st_mode)) {
+ goto cleanup;
+ }
/* do the actual file copy */
- while((len = fread(buf, 1, ALPM_BUFFER_SIZE, in))) {
- size_t nwritten = 0;
- nwritten = fwrite(buf, 1, len, out);
- if((nwritten != len) || ferror(out)) {
- ret = -1;
- goto cleanup;
+ while((nread = read(in, buf, ALPM_BUFFER_SIZE)) > 0 || errno == EINTR) {
+ ssize_t nwrite = 0;
+ if(nread < 0) {
+ continue;
}
+ do {
+ nwrite = write(out, buf + nwrite, nread);
+ if(nwrite >= 0) {
+ nread -= nwrite;
+ } else if(errno != EINTR) {
+ goto cleanup;
+ }
+ } while(nread > 0);
}
-
- /* chmod dest to permissions of src */
- struct stat statbuf;
- if(!fstat(fileno(in), &statbuf)) {
- fchmod(fileno(out), statbuf.st_mode);
- } else {
- /* stat was unsuccessful */
- ret = 1;
- }
+ ret = 0;
cleanup:
- fclose(in);
- fclose(out);
free(buf);
+ if(in >= 0) {
+ CLOSE(in);
+ }
+ if(out >= 0) {
+ CLOSE(out);
+ }
return ret;
}
@@ -730,49 +734,51 @@ int _alpm_lstat(const char *path, struct stat *buf)
#ifdef HAVE_LIBSSL
static int md5_file(const char *path, unsigned char output[16])
{
- FILE *f;
- size_t n;
MD5_CTX ctx;
unsigned char *buf;
+ ssize_t n;
+ int fd;
- CALLOC(buf, ALPM_BUFFER_SIZE, sizeof(unsigned char), return 1);
+ MALLOC(buf, (size_t)ALPM_BUFFER_SIZE, return 1);
- if((f = fopen(path, "rb")) == NULL) {
+ OPEN(fd, path, O_RDONLY);
+ if(fd < 0) {
free(buf);
return 1;
}
MD5_Init(&ctx);
- while((n = fread(buf, 1, ALPM_BUFFER_SIZE, f)) > 0) {
+ while((n = read(fd, buf, ALPM_BUFFER_SIZE)) > 0 || errno == EINTR) {
+ if(n < 0) {
+ continue;
+ }
MD5_Update(&ctx, buf, n);
}
- MD5_Final(output, &ctx);
-
- memset(&ctx, 0, sizeof(MD5_CTX));
+ CLOSE(fd);
free(buf);
- if(ferror(f) != 0) {
- fclose(f);
+ if(n < 0) {
return 2;
}
- fclose(f);
+ MD5_Final(output, &ctx);
return 0;
}
/* third param is so we match the PolarSSL definition */
static int sha2_file(const char *path, unsigned char output[32], int is224)
{
- FILE *f;
- size_t n;
SHA256_CTX ctx;
unsigned char *buf;
+ ssize_t n;
+ int fd;
- CALLOC(buf, ALPM_BUFFER_SIZE, sizeof(unsigned char), return 1);
+ MALLOC(buf, (size_t)ALPM_BUFFER_SIZE, return 1);
- if((f = fopen(path, "rb")) == NULL) {
+ OPEN(fd, path, O_RDONLY);
+ if(fd < 0) {
free(buf);
return 1;
}
@@ -783,7 +789,10 @@ static int sha2_file(const char *path, unsigned char output[32], int is224)
SHA256_Init(&ctx);
}
- while((n = fread(buf, 1, ALPM_BUFFER_SIZE, f)) > 0) {
+ while((n = read(fd, buf, ALPM_BUFFER_SIZE)) > 0 || errno == EINTR) {
+ if(n < 0) {
+ continue;
+ }
if(is224) {
SHA224_Update(&ctx, buf, n);
} else {
@@ -791,21 +800,18 @@ static int sha2_file(const char *path, unsigned char output[32], int is224)
}
}
- if(is224) {
- SHA224_Final(output, &ctx);
- } else {
- SHA256_Final(output, &ctx);
- }
-
- memset(&ctx, 0, sizeof(SHA256_CTX));
+ CLOSE(fd);
free(buf);
- if(ferror(f) != 0) {
- fclose(f);
+ if(n < 0) {
return 2;
}
- fclose(f);
+ if(is224) {
+ SHA224_Final(output, &ctx);
+ } else {
+ SHA256_Final(output, &ctx);
+ }
return 0;
}
#endif