apple2ix/Android/toolchain_edits/adb_sanitize.c

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//
// Sigh ... adb shell changes LF to CRLF in binary streams ...
//
// http://stackoverflow.com/questions/13578416/read-binary-stdout-data-from-adb-shell
//
// Problem:
// ( adb shell run-as com.example.someapp dd if=/data/data/com.example.someapp/some_binfile.bin 2\>/dev/null ) > local_binfile.bin
//
// * Without piping through adb_sanitize you would get a corrupted binary
//
// Fix:
// ( adb shell run-as com.example.someapp dd if=/data/data/com.example.someapp/some_binfile.bin 2\>/dev/null ) | adb_sanitize > local_binfile.bin
//
// Addenda:
// * The only other way to pull stuff from /data/data/... appears to be to use the heavyweight 'adb backup', yuck
//
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <unistd.h>
#include <sys/errno.h>
// cribbed from AOSP and modified with usleep() and to also ignore EAGAIN
#undef TEMP_FAILURE_RETRY
#define TEMP_FAILURE_RETRY(exp) ({ \
typeof (exp) _rc; \
do { \
_rc = (exp); \
if (_rc == -1 && (errno == EINTR || errno == EAGAIN) ) { \
usleep(10); \
} else { \
break; \
} \
} while (1); \
_rc; })
static int _convert_crlf_to_lf(void) {
const char CR = 0x0d;
const char LF = 0x0a;
ssize_t inlen = 0;
char inbuf[BUFSIZ];
char outbuf[BUFSIZ];
bool sawCR = false;
char *errRd = NULL;
char *errWrt = NULL;
while ( (inlen = TEMP_FAILURE_RETRY(read(STDIN_FILENO, inbuf, BUFSIZ))) ) {
if (inlen == -1) {
errRd = "error reading from stdin";
break;
}
// convert CRLF -> LF
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ssize_t outmax=0;
for (ssize_t i=0; i<inlen; i++) {
char c = inbuf[i];
if (sawCR && (c != LF)) {
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outbuf[outmax++] = CR;
}
sawCR = false;
if (c == CR) {
sawCR = true;
} else {
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outbuf[outmax++] = c;
}
}
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ssize_t outlen = 0;
do {
if (TEMP_FAILURE_RETRY(outlen = write(STDOUT_FILENO, outbuf, outmax)) == -1) {
errWrt = "error writing to stdout";
break;
}
outbuf += outlen;
outmax -= outlen;
} while (outmax > 0);
}
if (sawCR) {
if (TEMP_FAILURE_RETRY(write(STDOUT_FILENO, &CR, 1)) == -1) {
errWrt = "err writing to stdout";
}
}
if (errRd) {
fprintf(stderr, "%s : %s", errRd, strerror(errno));
return 1;
}
if (errWrt) {
fprintf(stderr, "%s : %s", errWrt, strerror(errno));
return 2;
}
TEMP_FAILURE_RETRY(fsync(STDOUT_FILENO));
return 0;
}
int main(int argc, char **argv, char **envp) {
#if UNIT_TEST
#error TODO FIXME ... should test edge cases CRLF split between buffered reads, and file/stream terminating 0D ([...0D][0A...] , [...0D])
_run_unit_tests();
#else
return _convert_crlf_to_lf();
#endif
}