1dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* 2dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Copyright (C) 2007 The Android Open Source Project 3dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 4dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 5dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * you may not use this file except in compliance with the License. 6dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * You may obtain a copy of the License at 7dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 8dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 9dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 10dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 11dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 12dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * See the License for the specific language governing permissions and 14dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * limitations under the License. 15dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project */ 16dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 17dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#define LOG_TAG "buffer" 18dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 19dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <assert.h> 20dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <errno.h> 21dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <stdlib.h> 22dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <unistd.h> 23dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 24dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include "buffer.h" 25dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include "loghack.h" 26dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 27dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source ProjectBuffer* bufferCreate(size_t capacity) { 28dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project Buffer* buffer = malloc(sizeof(Buffer)); 29dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (buffer == NULL) { 30dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return NULL; 31dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 32dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buffer->capacity = capacity; 33dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buffer->expected = 0; 34dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buffer->data = malloc(capacity); 35dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (buffer->data == NULL) { 36dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project free(buffer); 37dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return NULL; 38dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 39dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return buffer; 40dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 41dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 42dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectvoid bufferFree(Buffer* buffer) { 43dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project free(buffer->data); 44dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project free(buffer); 45dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 46dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 47dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source ProjectBuffer* bufferWrap(char* data, size_t capacity, size_t size) { 48dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project Buffer* buffer = malloc(sizeof(Buffer)); 49dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (buffer == NULL) { 50dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return NULL; 51dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 52dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 53dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buffer->data = data; 54dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buffer->capacity = capacity; 55dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buffer->size = size; 56dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buffer->expected = 0; 57dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return buffer; 58dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 59dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 60dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectint bufferPrepareForRead(Buffer* buffer, size_t expected) { 61dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (expected > buffer->capacity) { 62dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project // Expand buffer. 63dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project char* expanded = realloc(buffer->data, expected); 64dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (expanded == NULL) { 65dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project errno = ENOMEM; 66dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return -1; 67dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 68dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buffer->capacity = expected; 69dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buffer->data = expanded; 70dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 71dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 72dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buffer->size = 0; 73dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buffer->expected = expected; 74dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return 0; 75dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 76dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 77dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectssize_t bufferRead(Buffer* buffer, int fd) { 78dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project assert(buffer->size < buffer->expected); 79dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 80dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project ssize_t bytesRead = read(fd, 81dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buffer->data + buffer->size, 82dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buffer->expected - buffer->size); 83dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 84dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (bytesRead > 0) { 85dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buffer->size += bytesRead; 86dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return buffer->size; 87dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 88dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 89dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return bytesRead; 90dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 91dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 92dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectvoid bufferPrepareForWrite(Buffer* buffer) { 93dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buffer->remaining = buffer->size; 94dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 95dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 96dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectssize_t bufferWrite(Buffer* buffer, int fd) { 97dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project assert(buffer->remaining > 0); 98dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project assert(buffer->remaining <= buffer->size); 99dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 100dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project ssize_t bytesWritten = write(fd, 101dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buffer->data + buffer->size - buffer->remaining, 102dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buffer->remaining); 103dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 104dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (bytesWritten >= 0) { 105dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project buffer->remaining -= bytesWritten; 106dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 1078d66c49258ac4f59bd67c23c9c914cca81f85b01Steve Block ALOGD("Buffer bytes written: %d", (int) bytesWritten); 1088d66c49258ac4f59bd67c23c9c914cca81f85b01Steve Block ALOGD("Buffer size: %d", (int) buffer->size); 1098d66c49258ac4f59bd67c23c9c914cca81f85b01Steve Block ALOGD("Buffer remaining: %d", (int) buffer->remaining); 110dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 111dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return buffer->remaining; 112dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 113dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 114dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return bytesWritten; 115dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 116dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 117