116 lines
2.9 KiB
C
116 lines
2.9 KiB
C
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "buffer"
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#include <assert.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "buffer.h"
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#include "loghack.h"
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Buffer* bufferCreate(size_t capacity) {
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Buffer* buffer = malloc(sizeof(Buffer));
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if (buffer == NULL) {
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return NULL;
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}
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buffer->capacity = capacity;
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buffer->expected = 0;
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buffer->data = malloc(capacity);
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if (buffer->data == NULL) {
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free(buffer);
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return NULL;
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}
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return buffer;
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}
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void bufferFree(Buffer* buffer) {
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free(buffer->data);
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free(buffer);
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}
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Buffer* bufferWrap(char* data, size_t capacity, size_t size) {
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Buffer* buffer = malloc(sizeof(Buffer));
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if (buffer == NULL) {
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return NULL;
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}
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buffer->data = data;
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buffer->capacity = capacity;
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buffer->size = size;
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buffer->expected = 0;
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return buffer;
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}
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int bufferPrepareForRead(Buffer* buffer, size_t expected) {
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if (expected > buffer->capacity) {
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// Expand buffer.
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char* expanded = realloc(buffer->data, expected);
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if (expanded == NULL) {
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errno = ENOMEM;
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return -1;
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}
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buffer->capacity = expected;
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buffer->data = expanded;
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}
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buffer->size = 0;
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buffer->expected = expected;
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return 0;
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}
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ssize_t bufferRead(Buffer* buffer, int fd) {
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assert(buffer->size < buffer->expected);
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ssize_t bytesRead = read(fd,
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buffer->data + buffer->size,
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buffer->expected - buffer->size);
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if (bytesRead > 0) {
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buffer->size += bytesRead;
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return buffer->size;
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}
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return bytesRead;
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}
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void bufferPrepareForWrite(Buffer* buffer) {
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buffer->remaining = buffer->size;
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}
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ssize_t bufferWrite(Buffer* buffer, int fd) {
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assert(buffer->remaining > 0);
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assert(buffer->remaining <= buffer->size);
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ssize_t bytesWritten = write(fd,
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buffer->data + buffer->size - buffer->remaining,
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buffer->remaining);
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if (bytesWritten >= 0) {
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buffer->remaining -= bytesWritten;
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LOGD("Buffer bytes written: %d", (int) bytesWritten);
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LOGD("Buffer size: %d", (int) buffer->size);
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LOGD("Buffer remaining: %d", (int) buffer->remaining);
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return buffer->remaining;
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}
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return bytesWritten;
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}
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