Rename mount

native_client_sdk/src/examples/hello_nacl_mounts/handlers.c

-/* Copyright (c) 2012 The Chromium Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "handlers.h"
-
-#include <assert.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "hello_nacl_mounts.h"
-
-#define MAX_OPEN_FILES 10
-
-/**
- * A mapping from int -> FILE*, so the JavaScript messages can refer to an open
- * File. */
-static FILE* g_OpenFiles[MAX_OPEN_FILES];
-
-
-/**
- * Add the file to the g_OpenFiles map.
- * @param[in] file The file to add to g_OpenFiles.
- * @return int The index of the FILE in g_OpenFiles, or -1 if there are too many
- *     open files. */
-static int AddFileToMap(FILE* file) {
-  int i;
-  assert(file != NULL);
-  for (i = 0; i < MAX_OPEN_FILES; ++i) {
-    if (g_OpenFiles[i] == NULL) {
-      g_OpenFiles[i] = file;
-      return i;
-    }
-  }
-
-  return -1;
-}
-
-/**
- * Remove the file from the g_OpenFiles map.
- * @param[in] i The index of the file handle to remove. */
-static void RemoveFileFromMap(int i) {
-  assert(i >= 0 && i < MAX_OPEN_FILES);
-  g_OpenFiles[i] = NULL;
-}
-
-/**
- * Get a file handle from the g_OpenFiles map.
- * @param[in] i The index of the file handle to get.
- * @return the FILE*, or NULL of there is no open file with that handle.
- */
-static FILE* GetFileFromMap(int i) {
-  assert(i >= 0 && i < MAX_OPEN_FILES);
-  return g_OpenFiles[i];
-}
-
-/**
- * Get a file, given a string containing the index.
- * @param[in] s The string containing the file index.
- * @param[out] file_index The file index of this file.
- * @return The FILE* for this file, or NULL if the index is invalid. */
-static FILE* GetFileFromIndexString(const char* s, int* file_index) {
-  char* endptr;
-  int result = strtol(s, &endptr, 10);
-  if (endptr != s + strlen(s)) {
-    /* Garbage at the end of the number...? */
-    return NULL;
-  }
-
-  if (file_index)
-    *file_index = result;
-
-  return GetFileFromMap(result);
-}
-
-
-/**
- * Handle a call to fopen() made by JavaScript.
- *
- * fopen expects 2 parameters:
- *   0: the path of the file to open
- *   1: the mode string
- * on success, fopen returns a result in |output| separated by \1:
- *   0: "fopen"
- *   1: the filename opened
- *   2: the file index
- * on failure, fopen returns an error string in |output|.
- *
- * @param[in] num_params The number of params in |params|.
- * @param[in] params An array of strings, parameters to this function.
- * @param[out] output A string to write informational function output to.
- * @return An errorcode; 0 means success, anything else is a failure. */
-int HandleFopen(int num_params, char** params, char** output) {
-  FILE* file;
-  int file_index;
-  const char* filename;
-  const char* mode;
-
-  if (num_params != 2) {
-    *output = PrintfToNewString("Error: fopen takes 2 parameters.");
-    return 1;
-  }
-
-  filename = params[0];
-  mode = params[1];
-
-  file = fopen(filename, mode);
-  if (!file) {
-    *output = PrintfToNewString("Error: fopen returned a NULL FILE*.");
-    return 2;
-  }
-
-  file_index = AddFileToMap(file);
-  if (file_index == -1) {
-    *output = PrintfToNewString(
-        "Error: Example only allows %d open file handles.", MAX_OPEN_FILES);
-    return 3;
-  }
-
-  *output = PrintfToNewString("fopen\1%s\1%d", filename, file_index);
-  return 0;
-}
-
-/**
- * Handle a call to fwrite() made by JavaScript.
- *
- * fwrite expects 2 parameters:
- *   0: The index of the file (which is mapped to a FILE*)
- *   1: A string to write to the file
- * on success, fwrite returns a result in |output| separated by \1:
- *   0: "fwrite"
- *   1: the file index
- *   2: the number of bytes written
- * on failure, fwrite returns an error string in |output|.
- *
- * @param[in] num_params The number of params in |params|.
- * @param[in] params An array of strings, parameters to this function.
- * @param[out] output A string to write informational function output to.
- * @return An errorcode; 0 means success, anything else is a failure. */
-int HandleFwrite(int num_params, char** params, char** output) {
-  FILE* file;
-  const char* file_index_string;
-  const char* data;
-  size_t data_len;
-  size_t bytes_written;
-
-  if (num_params != 2) {
-    *output = PrintfToNewString("Error: fwrite takes 2 parameters.");
-    return 1;
-  }
-
-  file_index_string = params[0];
-  file = GetFileFromIndexString(file_index_string, NULL);
-  data = params[1];
-  data_len = strlen(data);
-
-  if (!file) {
-    *output = PrintfToNewString("Error: Unknown file handle %s.",
-                                file_index_string);
-    return 2;
-  }
-
-  bytes_written = fwrite(data, 1, data_len, file);
-
-  *output = PrintfToNewString("fwrite\1%s\1%d", file_index_string,
-                              bytes_written);
-  return 0;
-}
-
-/**
- * Handle a call to fread() made by JavaScript.
- *
- * fread expects 2 parameters:
- *   0: The index of the file (which is mapped to a FILE*)
- *   1: The number of bytes to read from the file.
- * on success, fread returns a result in |output| separated by \1:
- *   0: "fread"
- *   1: the file index
- *   2: the data read from the file
- * on failure, fread returns an error string in |output|.
- *
- * @param[in] num_params The number of params in |params|.
- * @param[in] params An array of strings, parameters to this function.
- * @param[out] output A string to write informational function output to.
- * @return An errorcode; 0 means success, anything else is a failure. */
-int HandleFread(int num_params, char** params, char** output) {
-  FILE* file;
-  const char* file_index_string;
-  char* buffer;
-  size_t data_len;
-  size_t bytes_read;
-
-  if (num_params != 2) {
-    *output = PrintfToNewString("Error: fread takes 2 parameters.");
-    return 1;
-  }
-
-  file_index_string = params[0];
-  file = GetFileFromIndexString(file_index_string, NULL);
-  data_len = strtol(params[1], NULL, 10);
-
-  if (!file) {
-    *output = PrintfToNewString("Error: Unknown file handle %s.",
-                                file_index_string);
-    return 2;
-  }
-
-  buffer = (char*)malloc(data_len + 1);
-  bytes_read = fread(buffer, 1, data_len, file);
-  buffer[bytes_read] = 0;
-
-  *output = PrintfToNewString("fread\1%s\1%s", file_index_string, buffer);
-  free(buffer);
-  return 0;
-}
-
-/**
- * Handle a call to fseek() made by JavaScript.
- *
- * fseek expects 3 parameters:
- *   0: The index of the file (which is mapped to a FILE*)
- *   1: The offset to seek to
- *   2: An integer representing the whence parameter of standard fseek.
- *      whence = 0: seek from the beginning of the file
- *      whence = 1: seek from the current file position
- *      whence = 2: seek from the end of the file
- * on success, fseek returns a result in |output| separated by \1:
- *   0: "fseek"
- *   1: the file index
- *   2: The new file position
- * on failure, fseek returns an error string in |output|.
- *
- * @param[in] num_params The number of params in |params|.
- * @param[in] params An array of strings, parameters to this function.
- * @param[out] output A string to write informational function output to.
- * @return An errorcode; 0 means success, anything else is a failure. */
-int HandleFseek(int num_params, char** params, char** output) {
-  FILE* file;
-  const char* file_index_string;
-  long offset;
-  int whence;
-  int result;
-
-  if (num_params != 3) {
-    *output = PrintfToNewString("Error: fseek takes 3 parameters.");
-    return 1;
-  }
-
-  file_index_string = params[0];
-  file = GetFileFromIndexString(file_index_string, NULL);
-  offset = strtol(params[1], NULL, 10);
-  whence = strtol(params[2], NULL, 10);
-
-  if (!file) {
-    *output = PrintfToNewString("Error: Unknown file handle %s.",
-                                file_index_string);
-    return 2;
-  }
-
-  result = fseek(file, offset, whence);
-  if (result) {
-    *output = PrintfToNewString("Error: fseek returned error %d.", result);
-    return 3;
-  }
-
-  offset = ftell(file);
-  if (offset < 0) {
-    *output = PrintfToNewString(
-        "Error: fseek succeeded, but ftell returned error %d.", offset);
-    return 4;
-  }
-
-  *output = PrintfToNewString("fseek\1%s\1%d", file_index_string, offset);
-  return 0;
-}
-
-/**
- * Handle a call to fclose() made by JavaScript.
- *
- * fclose expects 1 parameter:
- *   0: The index of the file (which is mapped to a FILE*)
- * on success, fclose returns a result in |output| separated by \1:
- *   0: "fclose"
- *   1: the file index
- * on failure, fclose returns an error string in |output|.
- *
- * @param[in] num_params The number of params in |params|.
- * @param[in] params An array of strings, parameters to this function.
- * @param[out] output A string to write informational function output to.
- * @return An errorcode; 0 means success, anything else is a failure. */
-int HandleFclose(int num_params, char** params, char** output) {
-  FILE* file;
-  int file_index;
-  const char* file_index_string;
-  int result;
-
-  if (num_params != 1) {
-    *output = PrintfToNewString("Error: fclose takes 1 parameters.");
-    return 1;
-  }
-
-  file_index_string = params[0];
-  file = GetFileFromIndexString(file_index_string, &file_index);
-  if (!file) {
-    *output = PrintfToNewString("Error: Unknown file handle %s.",
-                                file_index_string);
-    return 2;
-  }
-
-  result = fclose(file);
-  if (result) {
-    *output = PrintfToNewString("Error: fclose returned error %d.", result);
-    return 3;
-  }
-
-  RemoveFileFromMap(file_index);
-
-  *output = PrintfToNewString("fclose\1%s", file_index_string);
-  return 0;
-}