diff options
Diffstat (limited to 'src/fileapi.cpp')
| -rw-r--r-- | src/fileapi.cpp | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/src/fileapi.cpp b/src/fileapi.cpp new file mode 100644 index 00000000..3df73236 --- /dev/null +++ b/src/fileapi.cpp @@ -0,0 +1,213 @@ +/****************************************************************************** + * Project: PROJ.4 + * Purpose: Implementation of the pj_ctx_* file api, and the default stdio + * based implementation. + * Author: Frank Warmerdam, warmerdam@pobox.com + * + ****************************************************************************** + * Copyright (c) 2013, Frank Warmerdam + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + *****************************************************************************/ + +#include <errno.h> +#include <stddef.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "projects.h" + +static PAFile stdio_fopen(projCtx ctx, const char *filename, + const char *access); +static size_t stdio_fread(void *buffer, size_t size, size_t nmemb, + PAFile file); +static int stdio_fseek(PAFile file, long offset, int whence); +static long stdio_ftell(PAFile file); +static void stdio_fclose(PAFile file); + +static projFileAPI default_fileapi = { + stdio_fopen, + stdio_fread, + stdio_fseek, + stdio_ftell, + stdio_fclose +}; + +typedef struct { + projCtx ctx; + FILE *fp; +} stdio_pafile; + +/************************************************************************/ +/* pj_get_default_fileapi() */ +/************************************************************************/ + +projFileAPI *pj_get_default_fileapi(void) +{ + return &default_fileapi; +} + +/************************************************************************/ +/* stdio_fopen() */ +/************************************************************************/ + +static PAFile stdio_fopen(projCtx ctx, const char *filename, + const char *access) +{ + stdio_pafile *pafile; + FILE *fp; + + fp = fopen(filename, access); + if (fp == nullptr) + { + return nullptr; + } + + pafile = (stdio_pafile *) malloc(sizeof(stdio_pafile)); + if (!pafile) + { + pj_ctx_set_errno(ctx, ENOMEM); + fclose(fp); + return nullptr; + } + + pafile->fp = fp; + pafile->ctx = ctx; + return (PAFile) pafile; +} + +/************************************************************************/ +/* stdio_fread() */ +/************************************************************************/ + +static size_t stdio_fread(void *buffer, size_t size, size_t nmemb, + PAFile file) +{ + stdio_pafile *pafile = (stdio_pafile *) file; + return fread(buffer, size, nmemb, pafile->fp); +} + +/************************************************************************/ +/* stdio_fseek() */ +/************************************************************************/ +static int stdio_fseek(PAFile file, long offset, int whence) +{ + stdio_pafile *pafile = (stdio_pafile *) file; + return fseek(pafile->fp, offset, whence); +} + +/************************************************************************/ +/* stdio_ftell() */ +/************************************************************************/ +static long stdio_ftell(PAFile file) +{ + stdio_pafile *pafile = (stdio_pafile *) file; + return ftell(pafile->fp); +} + +/************************************************************************/ +/* stdio_fclose() */ +/************************************************************************/ +static void stdio_fclose(PAFile file) +{ + stdio_pafile *pafile = (stdio_pafile *) file; + fclose(pafile->fp); + free(pafile); +} + +/************************************************************************/ +/* pj_ctx_fopen() */ +/* */ +/* Open a file using the provided file io hooks. */ +/************************************************************************/ + +PAFile pj_ctx_fopen(projCtx ctx, const char *filename, const char *access) +{ + return ctx->fileapi->FOpen(ctx, filename, access); +} + +/************************************************************************/ +/* pj_ctx_fread() */ +/************************************************************************/ +size_t pj_ctx_fread(projCtx ctx, void *buffer, size_t size, size_t nmemb, PAFile file) +{ + return ctx->fileapi->FRead(buffer, size, nmemb, file); +} + +/************************************************************************/ +/* pj_ctx_fseek() */ +/************************************************************************/ +int pj_ctx_fseek(projCtx ctx, PAFile file, long offset, int whence) +{ + return ctx->fileapi->FSeek(file, offset, whence); +} + +/************************************************************************/ +/* pj_ctx_ftell() */ +/************************************************************************/ +long pj_ctx_ftell(projCtx ctx, PAFile file) +{ + return ctx->fileapi->FTell(file); +} + +/************************************************************************/ +/* pj_ctx_fclose() */ +/************************************************************************/ +void pj_ctx_fclose(projCtx ctx, PAFile file) +{ + ctx->fileapi->FClose(file); +} + +/************************************************************************/ +/* pj_ctx_fgets() */ +/* */ +/* A not very optimal implementation of fgets on top of */ +/* fread(). If we end up using this a lot more care should be */ +/* taken. */ +/************************************************************************/ + +char *pj_ctx_fgets(projCtx ctx, char *line, int size, PAFile file) +{ + long start = pj_ctx_ftell(ctx, file); + size_t bytes_read; + int i; + int max_size; + + line[size-1] = '\0'; + bytes_read = pj_ctx_fread(ctx, line, 1, size-1, file); + if(bytes_read == 0) + return nullptr; + if(bytes_read < (size_t)size) + { + line[bytes_read] = '\0'; + } + + max_size = (int)MIN(bytes_read, (size_t)(size > 2 ? size - 2 : 0)); + for( i = 0; i < max_size; i++) + { + if (line[i] == '\n') + { + line[i+1] = '\0'; + pj_ctx_fseek(ctx, file, start + i + 1, SEEK_SET); + break; + } + } + return line; +} |