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author | The Android Open Source Project <initial-contribution@android.com> | 2009-03-03 18:29:04 -0800 |
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committer | The Android Open Source Project <initial-contribution@android.com> | 2009-03-03 18:29:04 -0800 |
commit | e54eebbf1a908d65ee8cf80bab62821c05666d70 (patch) | |
tree | 4b825dc642cb6eb9a060e54bf8d69288fbee4904 /libcutils/record_stream.c | |
parent | a1e1c1b106423de09bc918502e7a51d4ffe5a4ae (diff) | |
download | system_core-e54eebbf1a908d65ee8cf80bab62821c05666d70.zip system_core-e54eebbf1a908d65ee8cf80bab62821c05666d70.tar.gz system_core-e54eebbf1a908d65ee8cf80bab62821c05666d70.tar.bz2 |
auto import from //depot/cupcake/@135843
Diffstat (limited to 'libcutils/record_stream.c')
-rw-r--r-- | libcutils/record_stream.c | 186 |
1 files changed, 0 insertions, 186 deletions
diff --git a/libcutils/record_stream.c b/libcutils/record_stream.c deleted file mode 100644 index 274423b..0000000 --- a/libcutils/record_stream.c +++ /dev/null @@ -1,186 +0,0 @@ -/* libs/cutils/record_stream.c -** -** Copyright 2006, The Android Open Source Project -** -** Licensed under the Apache License, Version 2.0 (the "License"); -** you may not use this file except in compliance with the License. -** You may obtain a copy of the License at -** -** http://www.apache.org/licenses/LICENSE-2.0 -** -** Unless required by applicable law or agreed to in writing, software -** distributed under the License is distributed on an "AS IS" BASIS, -** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -** See the License for the specific language governing permissions and -** limitations under the License. -*/ - -#include <stdlib.h> -#include <unistd.h> -#include <assert.h> -#include <errno.h> -#include <cutils/record_stream.h> -#include <string.h> -#include <stdint.h> -#ifdef HAVE_WINSOCK -#include <winsock2.h> /* for ntohl */ -#else -#include <netinet/in.h> -#endif - -#define HEADER_SIZE 4 - -struct RecordStream { - int fd; - size_t maxRecordLen; - - unsigned char *buffer; - - unsigned char *unconsumed; - unsigned char *read_end; - unsigned char *buffer_end; -}; - - -extern RecordStream *record_stream_new(int fd, size_t maxRecordLen) -{ - RecordStream *ret; - - assert (maxRecordLen <= 0xffff); - - ret = (RecordStream *)calloc(1, sizeof(RecordStream)); - - ret->fd = fd; - ret->maxRecordLen = maxRecordLen; - ret->buffer = (unsigned char *)malloc (maxRecordLen + HEADER_SIZE); - - ret->unconsumed = ret->buffer; - ret->read_end = ret->buffer; - ret->buffer_end = ret->buffer + maxRecordLen + HEADER_SIZE; - - return ret; -} - - -extern void record_stream_free(RecordStream *rs) -{ - free(rs->buffer); - free(rs); -} - - -/* returns NULL; if there isn't a full record in the buffer */ -static unsigned char * getEndOfRecord (unsigned char *p_begin, - unsigned char *p_end) -{ - size_t len; - unsigned char * p_ret; - - if (p_end < p_begin + HEADER_SIZE) { - return NULL; - } - - //First four bytes are length - len = ntohl(*((uint32_t *)p_begin)); - - p_ret = p_begin + HEADER_SIZE + len; - - if (p_end < p_ret) { - return NULL; - } - - return p_ret; -} - -static void *getNextRecord (RecordStream *p_rs, size_t *p_outRecordLen) -{ - unsigned char *record_start, *record_end; - - record_end = getEndOfRecord (p_rs->unconsumed, p_rs->read_end); - - if (record_end != NULL) { - /* one full line in the buffer */ - record_start = p_rs->unconsumed + HEADER_SIZE; - p_rs->unconsumed = record_end; - - *p_outRecordLen = record_end - record_start; - - return record_start; - } - - return NULL; -} - -/** - * Reads the next record from stream fd - * Records are prefixed by a 16-bit big endian length value - * Records may not be larger than maxRecordLen - * - * Doesn't guard against EINTR - * - * p_outRecord and p_outRecordLen may not be NULL - * - * Return 0 on success, -1 on fail - * Returns 0 with *p_outRecord set to NULL on end of stream - * Returns -1 / errno = EAGAIN if it needs to read again - */ -int record_stream_get_next (RecordStream *p_rs, void ** p_outRecord, - size_t *p_outRecordLen) -{ - void *ret; - - ssize_t countRead; - - /* is there one record already in the buffer? */ - ret = getNextRecord (p_rs, p_outRecordLen); - - if (ret != NULL) { - *p_outRecord = ret; - return 0; - } - - // if the buffer is full and we don't have a full record - if (p_rs->unconsumed == p_rs->buffer - && p_rs->read_end == p_rs->buffer_end - ) { - // this should never happen - //LOGE("max record length exceeded\n"); - assert (0); - errno = EFBIG; - return -1; - } - - if (p_rs->unconsumed != p_rs->buffer) { - // move remainder to the beginning of the buffer - size_t toMove; - - toMove = p_rs->read_end - p_rs->unconsumed; - if (toMove) { - memmove(p_rs->buffer, p_rs->unconsumed, toMove); - } - - p_rs->read_end = p_rs->buffer + toMove; - p_rs->unconsumed = p_rs->buffer; - } - - countRead = read (p_rs->fd, p_rs->read_end, p_rs->buffer_end - p_rs->read_end); - - if (countRead <= 0) { - /* note: end-of-stream drops through here too */ - *p_outRecord = NULL; - return countRead; - } - - p_rs->read_end += countRead; - - ret = getNextRecord (p_rs, p_outRecordLen); - - if (ret == NULL) { - /* not enough of a buffer to for a whole command */ - errno = EAGAIN; - return -1; - } - - *p_outRecord = ret; - return 0; -} |